Marek Vasut | bc2c90c | 2012-08-12 16:21:00 +0100 | [diff] [blame] | 1 | /* |
| 2 | * Freescale i.MX28 LRADC driver |
| 3 | * |
| 4 | * Copyright (c) 2012 DENX Software Engineering, GmbH. |
| 5 | * Marek Vasut <marex@denx.de> |
| 6 | * |
| 7 | * This program is free software; you can redistribute it and/or modify |
| 8 | * it under the terms of the GNU General Public License as published by |
| 9 | * the Free Software Foundation; either version 2 of the License, or |
| 10 | * (at your option) any later version. |
| 11 | * |
| 12 | * This program is distributed in the hope that it will be useful, |
| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | * GNU General Public License for more details. |
| 16 | */ |
| 17 | |
Thierry Reding | 97f4be60 | 2013-01-21 11:09:19 +0100 | [diff] [blame] | 18 | #include <linux/err.h> |
Marek Vasut | bc2c90c | 2012-08-12 16:21:00 +0100 | [diff] [blame] | 19 | #include <linux/interrupt.h> |
| 20 | #include <linux/device.h> |
| 21 | #include <linux/kernel.h> |
| 22 | #include <linux/slab.h> |
| 23 | #include <linux/of.h> |
| 24 | #include <linux/of_device.h> |
| 25 | #include <linux/sysfs.h> |
| 26 | #include <linux/list.h> |
| 27 | #include <linux/io.h> |
| 28 | #include <linux/module.h> |
| 29 | #include <linux/platform_device.h> |
| 30 | #include <linux/spinlock.h> |
| 31 | #include <linux/wait.h> |
| 32 | #include <linux/sched.h> |
| 33 | #include <linux/stmp_device.h> |
| 34 | #include <linux/bitops.h> |
| 35 | #include <linux/completion.h> |
Marek Vasut | 06ddd35 | 2013-01-11 23:35:00 +0000 | [diff] [blame] | 36 | #include <linux/delay.h> |
| 37 | #include <linux/input.h> |
Juergen Beisert | 18da755 | 2013-09-23 15:36:00 +0100 | [diff] [blame] | 38 | #include <linux/clk.h> |
Marek Vasut | bc2c90c | 2012-08-12 16:21:00 +0100 | [diff] [blame] | 39 | |
Marek Vasut | bc2c90c | 2012-08-12 16:21:00 +0100 | [diff] [blame] | 40 | #include <linux/iio/iio.h> |
Hector Palacios | d5acf59 | 2013-12-23 17:48:00 +0000 | [diff] [blame] | 41 | #include <linux/iio/sysfs.h> |
Marek Vasut | bc2c90c | 2012-08-12 16:21:00 +0100 | [diff] [blame] | 42 | #include <linux/iio/buffer.h> |
| 43 | #include <linux/iio/trigger.h> |
| 44 | #include <linux/iio/trigger_consumer.h> |
| 45 | #include <linux/iio/triggered_buffer.h> |
| 46 | |
| 47 | #define DRIVER_NAME "mxs-lradc" |
| 48 | |
| 49 | #define LRADC_MAX_DELAY_CHANS 4 |
| 50 | #define LRADC_MAX_MAPPED_CHANS 8 |
| 51 | #define LRADC_MAX_TOTAL_CHANS 16 |
| 52 | |
| 53 | #define LRADC_DELAY_TIMER_HZ 2000 |
| 54 | |
| 55 | /* |
| 56 | * Make this runtime configurable if necessary. Currently, if the buffered mode |
| 57 | * is enabled, the LRADC takes LRADC_DELAY_TIMER_LOOP samples of data before |
| 58 | * triggering IRQ. The sampling happens every (LRADC_DELAY_TIMER_PER / 2000) |
| 59 | * seconds. The result is that the samples arrive every 500mS. |
| 60 | */ |
| 61 | #define LRADC_DELAY_TIMER_PER 200 |
| 62 | #define LRADC_DELAY_TIMER_LOOP 5 |
| 63 | |
Marek Vasut | 06ddd35 | 2013-01-11 23:35:00 +0000 | [diff] [blame] | 64 | /* |
| 65 | * Once the pen touches the touchscreen, the touchscreen switches from |
| 66 | * IRQ-driven mode to polling mode to prevent interrupt storm. The polling |
| 67 | * is realized by worker thread, which is called every 20 or so milliseconds. |
| 68 | * This gives the touchscreen enough fluence and does not strain the system |
| 69 | * too much. |
| 70 | */ |
| 71 | #define LRADC_TS_SAMPLE_DELAY_MS 5 |
| 72 | |
| 73 | /* |
| 74 | * The LRADC reads the following amount of samples from each touchscreen |
| 75 | * channel and the driver then computes avarage of these. |
| 76 | */ |
| 77 | #define LRADC_TS_SAMPLE_AMOUNT 4 |
| 78 | |
Marek Vasut | 5e1f9ac | 2013-01-21 20:05:00 +0000 | [diff] [blame] | 79 | enum mxs_lradc_id { |
| 80 | IMX23_LRADC, |
| 81 | IMX28_LRADC, |
| 82 | }; |
| 83 | |
| 84 | static const char * const mx23_lradc_irq_names[] = { |
| 85 | "mxs-lradc-touchscreen", |
| 86 | "mxs-lradc-channel0", |
| 87 | "mxs-lradc-channel1", |
| 88 | "mxs-lradc-channel2", |
| 89 | "mxs-lradc-channel3", |
| 90 | "mxs-lradc-channel4", |
| 91 | "mxs-lradc-channel5", |
| 92 | "mxs-lradc-channel6", |
| 93 | "mxs-lradc-channel7", |
| 94 | }; |
| 95 | |
| 96 | static const char * const mx28_lradc_irq_names[] = { |
Marek Vasut | bc2c90c | 2012-08-12 16:21:00 +0100 | [diff] [blame] | 97 | "mxs-lradc-touchscreen", |
| 98 | "mxs-lradc-thresh0", |
| 99 | "mxs-lradc-thresh1", |
| 100 | "mxs-lradc-channel0", |
| 101 | "mxs-lradc-channel1", |
| 102 | "mxs-lradc-channel2", |
| 103 | "mxs-lradc-channel3", |
| 104 | "mxs-lradc-channel4", |
| 105 | "mxs-lradc-channel5", |
| 106 | "mxs-lradc-channel6", |
| 107 | "mxs-lradc-channel7", |
| 108 | "mxs-lradc-button0", |
| 109 | "mxs-lradc-button1", |
| 110 | }; |
| 111 | |
Marek Vasut | 5e1f9ac | 2013-01-21 20:05:00 +0000 | [diff] [blame] | 112 | struct mxs_lradc_of_config { |
| 113 | const int irq_count; |
| 114 | const char * const *irq_name; |
Hector Palacios | f6db68a | 2013-12-23 17:48:00 +0000 | [diff] [blame] | 115 | const uint32_t *vref_mv; |
| 116 | }; |
| 117 | |
| 118 | #define VREF_MV_BASE 1850 |
| 119 | |
| 120 | static const uint32_t mx23_vref_mv[LRADC_MAX_TOTAL_CHANS] = { |
| 121 | VREF_MV_BASE, /* CH0 */ |
| 122 | VREF_MV_BASE, /* CH1 */ |
| 123 | VREF_MV_BASE, /* CH2 */ |
| 124 | VREF_MV_BASE, /* CH3 */ |
| 125 | VREF_MV_BASE, /* CH4 */ |
| 126 | VREF_MV_BASE, /* CH5 */ |
| 127 | VREF_MV_BASE * 2, /* CH6 VDDIO */ |
| 128 | VREF_MV_BASE * 4, /* CH7 VBATT */ |
| 129 | VREF_MV_BASE, /* CH8 Temp sense 0 */ |
| 130 | VREF_MV_BASE, /* CH9 Temp sense 1 */ |
| 131 | VREF_MV_BASE, /* CH10 */ |
| 132 | VREF_MV_BASE, /* CH11 */ |
| 133 | VREF_MV_BASE, /* CH12 USB_DP */ |
| 134 | VREF_MV_BASE, /* CH13 USB_DN */ |
| 135 | VREF_MV_BASE, /* CH14 VBG */ |
| 136 | VREF_MV_BASE * 4, /* CH15 VDD5V */ |
| 137 | }; |
| 138 | |
| 139 | static const uint32_t mx28_vref_mv[LRADC_MAX_TOTAL_CHANS] = { |
| 140 | VREF_MV_BASE, /* CH0 */ |
| 141 | VREF_MV_BASE, /* CH1 */ |
| 142 | VREF_MV_BASE, /* CH2 */ |
| 143 | VREF_MV_BASE, /* CH3 */ |
| 144 | VREF_MV_BASE, /* CH4 */ |
| 145 | VREF_MV_BASE, /* CH5 */ |
| 146 | VREF_MV_BASE, /* CH6 */ |
| 147 | VREF_MV_BASE * 4, /* CH7 VBATT */ |
| 148 | VREF_MV_BASE, /* CH8 Temp sense 0 */ |
| 149 | VREF_MV_BASE, /* CH9 Temp sense 1 */ |
| 150 | VREF_MV_BASE * 2, /* CH10 VDDIO */ |
| 151 | VREF_MV_BASE, /* CH11 VTH */ |
| 152 | VREF_MV_BASE * 2, /* CH12 VDDA */ |
| 153 | VREF_MV_BASE, /* CH13 VDDD */ |
| 154 | VREF_MV_BASE, /* CH14 VBG */ |
| 155 | VREF_MV_BASE * 4, /* CH15 VDD5V */ |
Marek Vasut | 5e1f9ac | 2013-01-21 20:05:00 +0000 | [diff] [blame] | 156 | }; |
| 157 | |
Fabio Estevam | ad76fda | 2013-02-06 02:54:00 +0000 | [diff] [blame] | 158 | static const struct mxs_lradc_of_config mxs_lradc_of_config[] = { |
Marek Vasut | 5e1f9ac | 2013-01-21 20:05:00 +0000 | [diff] [blame] | 159 | [IMX23_LRADC] = { |
| 160 | .irq_count = ARRAY_SIZE(mx23_lradc_irq_names), |
| 161 | .irq_name = mx23_lradc_irq_names, |
Hector Palacios | f6db68a | 2013-12-23 17:48:00 +0000 | [diff] [blame] | 162 | .vref_mv = mx23_vref_mv, |
Marek Vasut | 5e1f9ac | 2013-01-21 20:05:00 +0000 | [diff] [blame] | 163 | }, |
| 164 | [IMX28_LRADC] = { |
| 165 | .irq_count = ARRAY_SIZE(mx28_lradc_irq_names), |
| 166 | .irq_name = mx28_lradc_irq_names, |
Hector Palacios | f6db68a | 2013-12-23 17:48:00 +0000 | [diff] [blame] | 167 | .vref_mv = mx28_vref_mv, |
Marek Vasut | 5e1f9ac | 2013-01-21 20:05:00 +0000 | [diff] [blame] | 168 | }, |
| 169 | }; |
| 170 | |
Marek Vasut | 06ddd35 | 2013-01-11 23:35:00 +0000 | [diff] [blame] | 171 | enum mxs_lradc_ts { |
| 172 | MXS_LRADC_TOUCHSCREEN_NONE = 0, |
| 173 | MXS_LRADC_TOUCHSCREEN_4WIRE, |
| 174 | MXS_LRADC_TOUCHSCREEN_5WIRE, |
Marek Vasut | bc2c90c | 2012-08-12 16:21:00 +0100 | [diff] [blame] | 175 | }; |
| 176 | |
Juergen Beisert | dee0530 | 2013-09-23 15:36:00 +0100 | [diff] [blame] | 177 | /* |
| 178 | * Touchscreen handling |
| 179 | */ |
| 180 | enum lradc_ts_plate { |
| 181 | LRADC_TOUCH = 0, |
| 182 | LRADC_SAMPLE_X, |
| 183 | LRADC_SAMPLE_Y, |
| 184 | LRADC_SAMPLE_PRESSURE, |
| 185 | LRADC_SAMPLE_VALID, |
| 186 | }; |
| 187 | |
Hector Palacios | aba70f2 | 2013-12-23 17:48:00 +0000 | [diff] [blame] | 188 | enum mxs_lradc_divbytwo { |
| 189 | MXS_LRADC_DIV_DISABLED = 0, |
| 190 | MXS_LRADC_DIV_ENABLED, |
| 191 | }; |
| 192 | |
Hector Palacios | d5acf59 | 2013-12-23 17:48:00 +0000 | [diff] [blame] | 193 | struct mxs_lradc_scale { |
| 194 | unsigned int integer; |
| 195 | unsigned int nano; |
| 196 | }; |
| 197 | |
Marek Vasut | bc2c90c | 2012-08-12 16:21:00 +0100 | [diff] [blame] | 198 | struct mxs_lradc { |
| 199 | struct device *dev; |
| 200 | void __iomem *base; |
| 201 | int irq[13]; |
| 202 | |
Juergen Beisert | 18da755 | 2013-09-23 15:36:00 +0100 | [diff] [blame] | 203 | struct clk *clk; |
| 204 | |
Marek Vasut | bc2c90c | 2012-08-12 16:21:00 +0100 | [diff] [blame] | 205 | uint32_t *buffer; |
| 206 | struct iio_trigger *trig; |
| 207 | |
| 208 | struct mutex lock; |
| 209 | |
Marek Vasut | bc2c90c | 2012-08-12 16:21:00 +0100 | [diff] [blame] | 210 | struct completion completion; |
Marek Vasut | 06ddd35 | 2013-01-11 23:35:00 +0000 | [diff] [blame] | 211 | |
Hector Palacios | f6db68a | 2013-12-23 17:48:00 +0000 | [diff] [blame] | 212 | const uint32_t *vref_mv; |
Hector Palacios | d5acf59 | 2013-12-23 17:48:00 +0000 | [diff] [blame] | 213 | struct mxs_lradc_scale scale_avail[LRADC_MAX_TOTAL_CHANS][2]; |
Alexandre Belloni | 38125b2 | 2013-12-23 17:48:00 +0000 | [diff] [blame] | 214 | unsigned long is_divided; |
Hector Palacios | f6db68a | 2013-12-23 17:48:00 +0000 | [diff] [blame] | 215 | |
Marek Vasut | 06ddd35 | 2013-01-11 23:35:00 +0000 | [diff] [blame] | 216 | /* |
| 217 | * Touchscreen LRADC channels receives a private slot in the CTRL4 |
| 218 | * register, the slot #7. Therefore only 7 slots instead of 8 in the |
| 219 | * CTRL4 register can be mapped to LRADC channels when using the |
| 220 | * touchscreen. |
| 221 | * |
| 222 | * Furthermore, certain LRADC channels are shared between touchscreen |
| 223 | * and/or touch-buttons and generic LRADC block. Therefore when using |
| 224 | * either of these, these channels are not available for the regular |
| 225 | * sampling. The shared channels are as follows: |
| 226 | * |
| 227 | * CH0 -- Touch button #0 |
| 228 | * CH1 -- Touch button #1 |
| 229 | * CH2 -- Touch screen XPUL |
| 230 | * CH3 -- Touch screen YPLL |
| 231 | * CH4 -- Touch screen XNUL |
| 232 | * CH5 -- Touch screen YNLR |
| 233 | * CH6 -- Touch screen WIPER (5-wire only) |
| 234 | * |
| 235 | * The bitfields below represents which parts of the LRADC block are |
| 236 | * switched into special mode of operation. These channels can not |
| 237 | * be sampled as regular LRADC channels. The driver will refuse any |
| 238 | * attempt to sample these channels. |
| 239 | */ |
| 240 | #define CHAN_MASK_TOUCHBUTTON (0x3 << 0) |
| 241 | #define CHAN_MASK_TOUCHSCREEN_4WIRE (0xf << 2) |
| 242 | #define CHAN_MASK_TOUCHSCREEN_5WIRE (0x1f << 2) |
| 243 | enum mxs_lradc_ts use_touchscreen; |
Marek Vasut | 06ddd35 | 2013-01-11 23:35:00 +0000 | [diff] [blame] | 244 | bool use_touchbutton; |
| 245 | |
| 246 | struct input_dev *ts_input; |
Juergen Beisert | ccff529 | 2013-09-23 15:36:00 +0100 | [diff] [blame] | 247 | |
| 248 | enum mxs_lradc_id soc; |
Juergen Beisert | dee0530 | 2013-09-23 15:36:00 +0100 | [diff] [blame] | 249 | enum lradc_ts_plate cur_plate; /* statemachine */ |
| 250 | bool ts_valid; |
| 251 | unsigned ts_x_pos; |
| 252 | unsigned ts_y_pos; |
| 253 | unsigned ts_pressure; |
| 254 | |
| 255 | /* handle touchscreen's physical behaviour */ |
| 256 | /* samples per coordinate */ |
| 257 | unsigned over_sample_cnt; |
| 258 | /* time clocks between samples */ |
| 259 | unsigned over_sample_delay; |
| 260 | /* time in clocks to wait after the plates where switched */ |
| 261 | unsigned settling_delay; |
Marek Vasut | bc2c90c | 2012-08-12 16:21:00 +0100 | [diff] [blame] | 262 | }; |
| 263 | |
| 264 | #define LRADC_CTRL0 0x00 |
Juergen Beisert | 7e4d4a6 | 2013-09-23 15:36:00 +0100 | [diff] [blame] | 265 | # define LRADC_CTRL0_MX28_TOUCH_DETECT_ENABLE (1 << 23) |
| 266 | # define LRADC_CTRL0_MX28_TOUCH_SCREEN_TYPE (1 << 22) |
| 267 | # define LRADC_CTRL0_MX28_YNNSW /* YM */ (1 << 21) |
| 268 | # define LRADC_CTRL0_MX28_YPNSW /* YP */ (1 << 20) |
| 269 | # define LRADC_CTRL0_MX28_YPPSW /* YP */ (1 << 19) |
| 270 | # define LRADC_CTRL0_MX28_XNNSW /* XM */ (1 << 18) |
| 271 | # define LRADC_CTRL0_MX28_XNPSW /* XM */ (1 << 17) |
| 272 | # define LRADC_CTRL0_MX28_XPPSW /* XP */ (1 << 16) |
| 273 | |
Juergen Beisert | 8c06f71 | 2013-09-23 15:36:00 +0100 | [diff] [blame] | 274 | # define LRADC_CTRL0_MX23_TOUCH_DETECT_ENABLE (1 << 20) |
| 275 | # define LRADC_CTRL0_MX23_YM (1 << 19) |
| 276 | # define LRADC_CTRL0_MX23_XM (1 << 18) |
| 277 | # define LRADC_CTRL0_MX23_YP (1 << 17) |
| 278 | # define LRADC_CTRL0_MX23_XP (1 << 16) |
| 279 | |
Juergen Beisert | 7e4d4a6 | 2013-09-23 15:36:00 +0100 | [diff] [blame] | 280 | # define LRADC_CTRL0_MX28_PLATE_MASK \ |
| 281 | (LRADC_CTRL0_MX28_TOUCH_DETECT_ENABLE | \ |
| 282 | LRADC_CTRL0_MX28_YNNSW | LRADC_CTRL0_MX28_YPNSW | \ |
| 283 | LRADC_CTRL0_MX28_YPPSW | LRADC_CTRL0_MX28_XNNSW | \ |
| 284 | LRADC_CTRL0_MX28_XNPSW | LRADC_CTRL0_MX28_XPPSW) |
Marek Vasut | bc2c90c | 2012-08-12 16:21:00 +0100 | [diff] [blame] | 285 | |
Juergen Beisert | 8c06f71 | 2013-09-23 15:36:00 +0100 | [diff] [blame] | 286 | # define LRADC_CTRL0_MX23_PLATE_MASK \ |
| 287 | (LRADC_CTRL0_MX23_TOUCH_DETECT_ENABLE | \ |
| 288 | LRADC_CTRL0_MX23_YM | LRADC_CTRL0_MX23_XM | \ |
| 289 | LRADC_CTRL0_MX23_YP | LRADC_CTRL0_MX23_XP) |
| 290 | |
Marek Vasut | bc2c90c | 2012-08-12 16:21:00 +0100 | [diff] [blame] | 291 | #define LRADC_CTRL1 0x10 |
Marek Vasut | 06ddd35 | 2013-01-11 23:35:00 +0000 | [diff] [blame] | 292 | #define LRADC_CTRL1_TOUCH_DETECT_IRQ_EN (1 << 24) |
Marek Vasut | bc2c90c | 2012-08-12 16:21:00 +0100 | [diff] [blame] | 293 | #define LRADC_CTRL1_LRADC_IRQ_EN(n) (1 << ((n) + 16)) |
Juergen Beisert | 7e4d4a6 | 2013-09-23 15:36:00 +0100 | [diff] [blame] | 294 | #define LRADC_CTRL1_MX28_LRADC_IRQ_EN_MASK (0x1fff << 16) |
Juergen Beisert | 8c06f71 | 2013-09-23 15:36:00 +0100 | [diff] [blame] | 295 | #define LRADC_CTRL1_MX23_LRADC_IRQ_EN_MASK (0x01ff << 16) |
Marek Vasut | 06ddd35 | 2013-01-11 23:35:00 +0000 | [diff] [blame] | 296 | #define LRADC_CTRL1_LRADC_IRQ_EN_OFFSET 16 |
| 297 | #define LRADC_CTRL1_TOUCH_DETECT_IRQ (1 << 8) |
| 298 | #define LRADC_CTRL1_LRADC_IRQ(n) (1 << (n)) |
Juergen Beisert | 7e4d4a6 | 2013-09-23 15:36:00 +0100 | [diff] [blame] | 299 | #define LRADC_CTRL1_MX28_LRADC_IRQ_MASK 0x1fff |
Juergen Beisert | 8c06f71 | 2013-09-23 15:36:00 +0100 | [diff] [blame] | 300 | #define LRADC_CTRL1_MX23_LRADC_IRQ_MASK 0x01ff |
Marek Vasut | 06ddd35 | 2013-01-11 23:35:00 +0000 | [diff] [blame] | 301 | #define LRADC_CTRL1_LRADC_IRQ_OFFSET 0 |
Marek Vasut | bc2c90c | 2012-08-12 16:21:00 +0100 | [diff] [blame] | 302 | |
| 303 | #define LRADC_CTRL2 0x20 |
Hector Palacios | aba70f2 | 2013-12-23 17:48:00 +0000 | [diff] [blame] | 304 | #define LRADC_CTRL2_DIVIDE_BY_TWO_OFFSET 24 |
Marek Vasut | bc2c90c | 2012-08-12 16:21:00 +0100 | [diff] [blame] | 305 | #define LRADC_CTRL2_TEMPSENSE_PWD (1 << 15) |
| 306 | |
Marek Vasut | 06ddd35 | 2013-01-11 23:35:00 +0000 | [diff] [blame] | 307 | #define LRADC_STATUS 0x40 |
| 308 | #define LRADC_STATUS_TOUCH_DETECT_RAW (1 << 0) |
| 309 | |
Marek Vasut | bc2c90c | 2012-08-12 16:21:00 +0100 | [diff] [blame] | 310 | #define LRADC_CH(n) (0x50 + (0x10 * (n))) |
| 311 | #define LRADC_CH_ACCUMULATE (1 << 29) |
| 312 | #define LRADC_CH_NUM_SAMPLES_MASK (0x1f << 24) |
| 313 | #define LRADC_CH_NUM_SAMPLES_OFFSET 24 |
Juergen Beisert | dee0530 | 2013-09-23 15:36:00 +0100 | [diff] [blame] | 314 | #define LRADC_CH_NUM_SAMPLES(x) \ |
| 315 | ((x) << LRADC_CH_NUM_SAMPLES_OFFSET) |
Marek Vasut | bc2c90c | 2012-08-12 16:21:00 +0100 | [diff] [blame] | 316 | #define LRADC_CH_VALUE_MASK 0x3ffff |
| 317 | #define LRADC_CH_VALUE_OFFSET 0 |
| 318 | |
| 319 | #define LRADC_DELAY(n) (0xd0 + (0x10 * (n))) |
| 320 | #define LRADC_DELAY_TRIGGER_LRADCS_MASK (0xff << 24) |
| 321 | #define LRADC_DELAY_TRIGGER_LRADCS_OFFSET 24 |
Juergen Beisert | dee0530 | 2013-09-23 15:36:00 +0100 | [diff] [blame] | 322 | #define LRADC_DELAY_TRIGGER(x) \ |
| 323 | (((x) << LRADC_DELAY_TRIGGER_LRADCS_OFFSET) & \ |
| 324 | LRADC_DELAY_TRIGGER_LRADCS_MASK) |
Marek Vasut | bc2c90c | 2012-08-12 16:21:00 +0100 | [diff] [blame] | 325 | #define LRADC_DELAY_KICK (1 << 20) |
| 326 | #define LRADC_DELAY_TRIGGER_DELAYS_MASK (0xf << 16) |
| 327 | #define LRADC_DELAY_TRIGGER_DELAYS_OFFSET 16 |
Juergen Beisert | dee0530 | 2013-09-23 15:36:00 +0100 | [diff] [blame] | 328 | #define LRADC_DELAY_TRIGGER_DELAYS(x) \ |
| 329 | (((x) << LRADC_DELAY_TRIGGER_DELAYS_OFFSET) & \ |
| 330 | LRADC_DELAY_TRIGGER_DELAYS_MASK) |
Marek Vasut | bc2c90c | 2012-08-12 16:21:00 +0100 | [diff] [blame] | 331 | #define LRADC_DELAY_LOOP_COUNT_MASK (0x1f << 11) |
| 332 | #define LRADC_DELAY_LOOP_COUNT_OFFSET 11 |
Juergen Beisert | dee0530 | 2013-09-23 15:36:00 +0100 | [diff] [blame] | 333 | #define LRADC_DELAY_LOOP(x) \ |
| 334 | (((x) << LRADC_DELAY_LOOP_COUNT_OFFSET) & \ |
| 335 | LRADC_DELAY_LOOP_COUNT_MASK) |
Marek Vasut | bc2c90c | 2012-08-12 16:21:00 +0100 | [diff] [blame] | 336 | #define LRADC_DELAY_DELAY_MASK 0x7ff |
| 337 | #define LRADC_DELAY_DELAY_OFFSET 0 |
Juergen Beisert | dee0530 | 2013-09-23 15:36:00 +0100 | [diff] [blame] | 338 | #define LRADC_DELAY_DELAY(x) \ |
| 339 | (((x) << LRADC_DELAY_DELAY_OFFSET) & \ |
| 340 | LRADC_DELAY_DELAY_MASK) |
Marek Vasut | bc2c90c | 2012-08-12 16:21:00 +0100 | [diff] [blame] | 341 | |
| 342 | #define LRADC_CTRL4 0x140 |
| 343 | #define LRADC_CTRL4_LRADCSELECT_MASK(n) (0xf << ((n) * 4)) |
| 344 | #define LRADC_CTRL4_LRADCSELECT_OFFSET(n) ((n) * 4) |
| 345 | |
Hector Palacios | 1eb70a9 | 2013-07-22 15:03:00 +0100 | [diff] [blame] | 346 | #define LRADC_RESOLUTION 12 |
| 347 | #define LRADC_SINGLE_SAMPLE_MASK ((1 << LRADC_RESOLUTION) - 1) |
| 348 | |
Juergen Beisert | f0b83cc | 2013-09-23 15:36:00 +0100 | [diff] [blame] | 349 | static void mxs_lradc_reg_set(struct mxs_lradc *lradc, u32 val, u32 reg) |
| 350 | { |
| 351 | writel(val, lradc->base + reg + STMP_OFFSET_REG_SET); |
| 352 | } |
| 353 | |
| 354 | static void mxs_lradc_reg_clear(struct mxs_lradc *lradc, u32 val, u32 reg) |
| 355 | { |
| 356 | writel(val, lradc->base + reg + STMP_OFFSET_REG_CLR); |
| 357 | } |
| 358 | |
| 359 | static void mxs_lradc_reg_wrt(struct mxs_lradc *lradc, u32 val, u32 reg) |
| 360 | { |
| 361 | writel(val, lradc->base + reg); |
| 362 | } |
| 363 | |
| 364 | static u32 mxs_lradc_plate_mask(struct mxs_lradc *lradc) |
| 365 | { |
Juergen Beisert | 8c06f71 | 2013-09-23 15:36:00 +0100 | [diff] [blame] | 366 | if (lradc->soc == IMX23_LRADC) |
| 367 | return LRADC_CTRL0_MX23_PLATE_MASK; |
| 368 | else |
| 369 | return LRADC_CTRL0_MX28_PLATE_MASK; |
Juergen Beisert | f0b83cc | 2013-09-23 15:36:00 +0100 | [diff] [blame] | 370 | } |
| 371 | |
| 372 | static u32 mxs_lradc_irq_en_mask(struct mxs_lradc *lradc) |
| 373 | { |
Juergen Beisert | 8c06f71 | 2013-09-23 15:36:00 +0100 | [diff] [blame] | 374 | if (lradc->soc == IMX23_LRADC) |
| 375 | return LRADC_CTRL1_MX23_LRADC_IRQ_EN_MASK; |
| 376 | else |
| 377 | return LRADC_CTRL1_MX28_LRADC_IRQ_EN_MASK; |
Juergen Beisert | f0b83cc | 2013-09-23 15:36:00 +0100 | [diff] [blame] | 378 | } |
| 379 | |
| 380 | static u32 mxs_lradc_irq_mask(struct mxs_lradc *lradc) |
| 381 | { |
Juergen Beisert | 8c06f71 | 2013-09-23 15:36:00 +0100 | [diff] [blame] | 382 | if (lradc->soc == IMX23_LRADC) |
| 383 | return LRADC_CTRL1_MX23_LRADC_IRQ_MASK; |
| 384 | else |
| 385 | return LRADC_CTRL1_MX28_LRADC_IRQ_MASK; |
Juergen Beisert | f0b83cc | 2013-09-23 15:36:00 +0100 | [diff] [blame] | 386 | } |
| 387 | |
| 388 | static u32 mxs_lradc_touch_detect_bit(struct mxs_lradc *lradc) |
| 389 | { |
Juergen Beisert | 8c06f71 | 2013-09-23 15:36:00 +0100 | [diff] [blame] | 390 | if (lradc->soc == IMX23_LRADC) |
| 391 | return LRADC_CTRL0_MX23_TOUCH_DETECT_ENABLE; |
| 392 | else |
| 393 | return LRADC_CTRL0_MX28_TOUCH_DETECT_ENABLE; |
Juergen Beisert | f0b83cc | 2013-09-23 15:36:00 +0100 | [diff] [blame] | 394 | } |
| 395 | |
| 396 | static u32 mxs_lradc_drive_x_plate(struct mxs_lradc *lradc) |
| 397 | { |
Juergen Beisert | 8c06f71 | 2013-09-23 15:36:00 +0100 | [diff] [blame] | 398 | if (lradc->soc == IMX23_LRADC) |
| 399 | return LRADC_CTRL0_MX23_XP | LRADC_CTRL0_MX23_XM; |
| 400 | else |
| 401 | return LRADC_CTRL0_MX28_XPPSW | LRADC_CTRL0_MX28_XNNSW; |
Juergen Beisert | f0b83cc | 2013-09-23 15:36:00 +0100 | [diff] [blame] | 402 | } |
| 403 | |
| 404 | static u32 mxs_lradc_drive_y_plate(struct mxs_lradc *lradc) |
| 405 | { |
Juergen Beisert | 8c06f71 | 2013-09-23 15:36:00 +0100 | [diff] [blame] | 406 | if (lradc->soc == IMX23_LRADC) |
| 407 | return LRADC_CTRL0_MX23_YP | LRADC_CTRL0_MX23_YM; |
| 408 | else |
| 409 | return LRADC_CTRL0_MX28_YPPSW | LRADC_CTRL0_MX28_YNNSW; |
Juergen Beisert | f0b83cc | 2013-09-23 15:36:00 +0100 | [diff] [blame] | 410 | } |
| 411 | |
| 412 | static u32 mxs_lradc_drive_pressure(struct mxs_lradc *lradc) |
| 413 | { |
Juergen Beisert | 8c06f71 | 2013-09-23 15:36:00 +0100 | [diff] [blame] | 414 | if (lradc->soc == IMX23_LRADC) |
| 415 | return LRADC_CTRL0_MX23_YP | LRADC_CTRL0_MX23_XM; |
| 416 | else |
| 417 | return LRADC_CTRL0_MX28_YPPSW | LRADC_CTRL0_MX28_XNNSW; |
Juergen Beisert | f0b83cc | 2013-09-23 15:36:00 +0100 | [diff] [blame] | 418 | } |
| 419 | |
Juergen Beisert | dee0530 | 2013-09-23 15:36:00 +0100 | [diff] [blame] | 420 | static bool mxs_lradc_check_touch_event(struct mxs_lradc *lradc) |
| 421 | { |
| 422 | return !!(readl(lradc->base + LRADC_STATUS) & |
| 423 | LRADC_STATUS_TOUCH_DETECT_RAW); |
| 424 | } |
| 425 | |
| 426 | static void mxs_lradc_setup_ts_channel(struct mxs_lradc *lradc, unsigned ch) |
| 427 | { |
| 428 | /* |
| 429 | * prepare for oversampling conversion |
| 430 | * |
| 431 | * from the datasheet: |
| 432 | * "The ACCUMULATE bit in the appropriate channel register |
| 433 | * HW_LRADC_CHn must be set to 1 if NUM_SAMPLES is greater then 0; |
| 434 | * otherwise, the IRQs will not fire." |
| 435 | */ |
| 436 | mxs_lradc_reg_wrt(lradc, LRADC_CH_ACCUMULATE | |
| 437 | LRADC_CH_NUM_SAMPLES(lradc->over_sample_cnt - 1), |
| 438 | LRADC_CH(ch)); |
| 439 | |
| 440 | /* from the datasheet: |
| 441 | * "Software must clear this register in preparation for a |
| 442 | * multi-cycle accumulation. |
| 443 | */ |
| 444 | mxs_lradc_reg_clear(lradc, LRADC_CH_VALUE_MASK, LRADC_CH(ch)); |
| 445 | |
| 446 | /* prepare the delay/loop unit according to the oversampling count */ |
| 447 | mxs_lradc_reg_wrt(lradc, LRADC_DELAY_TRIGGER(1 << ch) | |
| 448 | LRADC_DELAY_TRIGGER_DELAYS(0) | |
| 449 | LRADC_DELAY_LOOP(lradc->over_sample_cnt - 1) | |
| 450 | LRADC_DELAY_DELAY(lradc->over_sample_delay - 1), |
| 451 | LRADC_DELAY(3)); |
| 452 | |
| 453 | mxs_lradc_reg_clear(lradc, LRADC_CTRL1_LRADC_IRQ(2) | |
| 454 | LRADC_CTRL1_LRADC_IRQ(3) | LRADC_CTRL1_LRADC_IRQ(4) | |
| 455 | LRADC_CTRL1_LRADC_IRQ(5), LRADC_CTRL1); |
| 456 | |
| 457 | /* wake us again, when the complete conversion is done */ |
| 458 | mxs_lradc_reg_set(lradc, LRADC_CTRL1_LRADC_IRQ_EN(ch), LRADC_CTRL1); |
| 459 | /* |
| 460 | * after changing the touchscreen plates setting |
| 461 | * the signals need some initial time to settle. Start the |
| 462 | * SoC's delay unit and start the conversion later |
| 463 | * and automatically. |
| 464 | */ |
| 465 | mxs_lradc_reg_wrt(lradc, LRADC_DELAY_TRIGGER(0) | /* don't trigger ADC */ |
| 466 | LRADC_DELAY_TRIGGER_DELAYS(1 << 3) | /* trigger DELAY unit#3 */ |
| 467 | LRADC_DELAY_KICK | |
| 468 | LRADC_DELAY_DELAY(lradc->settling_delay), |
| 469 | LRADC_DELAY(2)); |
| 470 | } |
| 471 | |
| 472 | /* |
| 473 | * Pressure detection is special: |
| 474 | * We want to do both required measurements for the pressure detection in |
| 475 | * one turn. Use the hardware features to chain both conversions and let the |
| 476 | * hardware report one interrupt if both conversions are done |
| 477 | */ |
| 478 | static void mxs_lradc_setup_ts_pressure(struct mxs_lradc *lradc, unsigned ch1, |
| 479 | unsigned ch2) |
| 480 | { |
| 481 | u32 reg; |
| 482 | |
| 483 | /* |
| 484 | * prepare for oversampling conversion |
| 485 | * |
| 486 | * from the datasheet: |
| 487 | * "The ACCUMULATE bit in the appropriate channel register |
| 488 | * HW_LRADC_CHn must be set to 1 if NUM_SAMPLES is greater then 0; |
| 489 | * otherwise, the IRQs will not fire." |
| 490 | */ |
| 491 | reg = LRADC_CH_ACCUMULATE | |
| 492 | LRADC_CH_NUM_SAMPLES(lradc->over_sample_cnt - 1); |
| 493 | mxs_lradc_reg_wrt(lradc, reg, LRADC_CH(ch1)); |
| 494 | mxs_lradc_reg_wrt(lradc, reg, LRADC_CH(ch2)); |
| 495 | |
| 496 | /* from the datasheet: |
| 497 | * "Software must clear this register in preparation for a |
| 498 | * multi-cycle accumulation. |
| 499 | */ |
| 500 | mxs_lradc_reg_clear(lradc, LRADC_CH_VALUE_MASK, LRADC_CH(ch1)); |
| 501 | mxs_lradc_reg_clear(lradc, LRADC_CH_VALUE_MASK, LRADC_CH(ch2)); |
| 502 | |
| 503 | /* prepare the delay/loop unit according to the oversampling count */ |
| 504 | mxs_lradc_reg_wrt(lradc, LRADC_DELAY_TRIGGER(1 << ch1) | |
| 505 | LRADC_DELAY_TRIGGER(1 << ch2) | /* start both channels */ |
| 506 | LRADC_DELAY_TRIGGER_DELAYS(0) | |
| 507 | LRADC_DELAY_LOOP(lradc->over_sample_cnt - 1) | |
| 508 | LRADC_DELAY_DELAY(lradc->over_sample_delay - 1), |
| 509 | LRADC_DELAY(3)); |
| 510 | |
| 511 | mxs_lradc_reg_clear(lradc, LRADC_CTRL1_LRADC_IRQ(2) | |
| 512 | LRADC_CTRL1_LRADC_IRQ(3) | LRADC_CTRL1_LRADC_IRQ(4) | |
| 513 | LRADC_CTRL1_LRADC_IRQ(5), LRADC_CTRL1); |
| 514 | |
| 515 | /* wake us again, when the conversions are done */ |
| 516 | mxs_lradc_reg_set(lradc, LRADC_CTRL1_LRADC_IRQ_EN(ch2), LRADC_CTRL1); |
| 517 | /* |
| 518 | * after changing the touchscreen plates setting |
| 519 | * the signals need some initial time to settle. Start the |
| 520 | * SoC's delay unit and start the conversion later |
| 521 | * and automatically. |
| 522 | */ |
| 523 | mxs_lradc_reg_wrt(lradc, LRADC_DELAY_TRIGGER(0) | /* don't trigger ADC */ |
| 524 | LRADC_DELAY_TRIGGER_DELAYS(1 << 3) | /* trigger DELAY unit#3 */ |
| 525 | LRADC_DELAY_KICK | |
| 526 | LRADC_DELAY_DELAY(lradc->settling_delay), LRADC_DELAY(2)); |
| 527 | } |
| 528 | |
| 529 | static unsigned mxs_lradc_read_raw_channel(struct mxs_lradc *lradc, |
| 530 | unsigned channel) |
| 531 | { |
| 532 | u32 reg; |
| 533 | unsigned num_samples, val; |
| 534 | |
| 535 | reg = readl(lradc->base + LRADC_CH(channel)); |
| 536 | if (reg & LRADC_CH_ACCUMULATE) |
| 537 | num_samples = lradc->over_sample_cnt; |
| 538 | else |
| 539 | num_samples = 1; |
| 540 | |
| 541 | val = (reg & LRADC_CH_VALUE_MASK) >> LRADC_CH_VALUE_OFFSET; |
| 542 | return val / num_samples; |
| 543 | } |
| 544 | |
| 545 | static unsigned mxs_lradc_read_ts_pressure(struct mxs_lradc *lradc, |
| 546 | unsigned ch1, unsigned ch2) |
| 547 | { |
| 548 | u32 reg, mask; |
| 549 | unsigned pressure, m1, m2; |
| 550 | |
| 551 | mask = LRADC_CTRL1_LRADC_IRQ(ch1) | LRADC_CTRL1_LRADC_IRQ(ch2); |
| 552 | reg = readl(lradc->base + LRADC_CTRL1) & mask; |
| 553 | |
| 554 | while (reg != mask) { |
| 555 | reg = readl(lradc->base + LRADC_CTRL1) & mask; |
| 556 | dev_dbg(lradc->dev, "One channel is still busy: %X\n", reg); |
| 557 | } |
| 558 | |
| 559 | m1 = mxs_lradc_read_raw_channel(lradc, ch1); |
| 560 | m2 = mxs_lradc_read_raw_channel(lradc, ch2); |
| 561 | |
| 562 | if (m2 == 0) { |
| 563 | dev_warn(lradc->dev, "Cannot calculate pressure\n"); |
| 564 | return 1 << (LRADC_RESOLUTION - 1); |
| 565 | } |
| 566 | |
| 567 | /* simply scale the value from 0 ... max ADC resolution */ |
| 568 | pressure = m1; |
| 569 | pressure *= (1 << LRADC_RESOLUTION); |
| 570 | pressure /= m2; |
| 571 | |
| 572 | dev_dbg(lradc->dev, "Pressure = %u\n", pressure); |
| 573 | return pressure; |
| 574 | } |
| 575 | |
| 576 | #define TS_CH_XP 2 |
| 577 | #define TS_CH_YP 3 |
| 578 | #define TS_CH_XM 4 |
| 579 | #define TS_CH_YM 5 |
| 580 | |
| 581 | static int mxs_lradc_read_ts_channel(struct mxs_lradc *lradc) |
| 582 | { |
| 583 | u32 reg; |
| 584 | int val; |
| 585 | |
| 586 | reg = readl(lradc->base + LRADC_CTRL1); |
| 587 | |
| 588 | /* only channels 3 to 5 are of interest here */ |
| 589 | if (reg & LRADC_CTRL1_LRADC_IRQ(TS_CH_YP)) { |
| 590 | mxs_lradc_reg_clear(lradc, LRADC_CTRL1_LRADC_IRQ_EN(TS_CH_YP) | |
| 591 | LRADC_CTRL1_LRADC_IRQ(TS_CH_YP), LRADC_CTRL1); |
| 592 | val = mxs_lradc_read_raw_channel(lradc, TS_CH_YP); |
| 593 | } else if (reg & LRADC_CTRL1_LRADC_IRQ(TS_CH_XM)) { |
| 594 | mxs_lradc_reg_clear(lradc, LRADC_CTRL1_LRADC_IRQ_EN(TS_CH_XM) | |
| 595 | LRADC_CTRL1_LRADC_IRQ(TS_CH_XM), LRADC_CTRL1); |
| 596 | val = mxs_lradc_read_raw_channel(lradc, TS_CH_XM); |
| 597 | } else if (reg & LRADC_CTRL1_LRADC_IRQ(TS_CH_YM)) { |
| 598 | mxs_lradc_reg_clear(lradc, LRADC_CTRL1_LRADC_IRQ_EN(TS_CH_YM) | |
| 599 | LRADC_CTRL1_LRADC_IRQ(TS_CH_YM), LRADC_CTRL1); |
| 600 | val = mxs_lradc_read_raw_channel(lradc, TS_CH_YM); |
| 601 | } else { |
| 602 | return -EIO; |
| 603 | } |
| 604 | |
| 605 | mxs_lradc_reg_wrt(lradc, 0, LRADC_DELAY(2)); |
| 606 | mxs_lradc_reg_wrt(lradc, 0, LRADC_DELAY(3)); |
| 607 | |
| 608 | return val; |
| 609 | } |
| 610 | |
| 611 | /* |
| 612 | * YP(open)--+-------------+ |
| 613 | * | |--+ |
| 614 | * | | | |
| 615 | * YM(-)--+-------------+ | |
| 616 | * +--------------+ |
| 617 | * | | |
| 618 | * XP(weak+) XM(open) |
| 619 | * |
| 620 | * "weak+" means 200k Ohm VDDIO |
| 621 | * (-) means GND |
| 622 | */ |
| 623 | static void mxs_lradc_setup_touch_detection(struct mxs_lradc *lradc) |
| 624 | { |
| 625 | /* |
| 626 | * In order to detect a touch event the 'touch detect enable' bit |
| 627 | * enables: |
| 628 | * - a weak pullup to the X+ connector |
| 629 | * - a strong ground at the Y- connector |
| 630 | */ |
| 631 | mxs_lradc_reg_clear(lradc, mxs_lradc_plate_mask(lradc), LRADC_CTRL0); |
| 632 | mxs_lradc_reg_set(lradc, mxs_lradc_touch_detect_bit(lradc), |
| 633 | LRADC_CTRL0); |
| 634 | } |
| 635 | |
| 636 | /* |
| 637 | * YP(meas)--+-------------+ |
| 638 | * | |--+ |
| 639 | * | | | |
| 640 | * YM(open)--+-------------+ | |
| 641 | * +--------------+ |
| 642 | * | | |
| 643 | * XP(+) XM(-) |
| 644 | * |
| 645 | * (+) means here 1.85 V |
| 646 | * (-) means here GND |
| 647 | */ |
| 648 | static void mxs_lradc_prepare_x_pos(struct mxs_lradc *lradc) |
| 649 | { |
| 650 | mxs_lradc_reg_clear(lradc, mxs_lradc_plate_mask(lradc), LRADC_CTRL0); |
| 651 | mxs_lradc_reg_set(lradc, mxs_lradc_drive_x_plate(lradc), LRADC_CTRL0); |
| 652 | |
| 653 | lradc->cur_plate = LRADC_SAMPLE_X; |
| 654 | mxs_lradc_setup_ts_channel(lradc, TS_CH_YP); |
| 655 | } |
| 656 | |
| 657 | /* |
| 658 | * YP(+)--+-------------+ |
| 659 | * | |--+ |
| 660 | * | | | |
| 661 | * YM(-)--+-------------+ | |
| 662 | * +--------------+ |
| 663 | * | | |
| 664 | * XP(open) XM(meas) |
| 665 | * |
| 666 | * (+) means here 1.85 V |
| 667 | * (-) means here GND |
| 668 | */ |
| 669 | static void mxs_lradc_prepare_y_pos(struct mxs_lradc *lradc) |
| 670 | { |
| 671 | mxs_lradc_reg_clear(lradc, mxs_lradc_plate_mask(lradc), LRADC_CTRL0); |
| 672 | mxs_lradc_reg_set(lradc, mxs_lradc_drive_y_plate(lradc), LRADC_CTRL0); |
| 673 | |
| 674 | lradc->cur_plate = LRADC_SAMPLE_Y; |
| 675 | mxs_lradc_setup_ts_channel(lradc, TS_CH_XM); |
| 676 | } |
| 677 | |
| 678 | /* |
| 679 | * YP(+)--+-------------+ |
| 680 | * | |--+ |
| 681 | * | | | |
| 682 | * YM(meas)--+-------------+ | |
| 683 | * +--------------+ |
| 684 | * | | |
| 685 | * XP(meas) XM(-) |
| 686 | * |
| 687 | * (+) means here 1.85 V |
| 688 | * (-) means here GND |
| 689 | */ |
| 690 | static void mxs_lradc_prepare_pressure(struct mxs_lradc *lradc) |
| 691 | { |
| 692 | mxs_lradc_reg_clear(lradc, mxs_lradc_plate_mask(lradc), LRADC_CTRL0); |
| 693 | mxs_lradc_reg_set(lradc, mxs_lradc_drive_pressure(lradc), LRADC_CTRL0); |
| 694 | |
| 695 | lradc->cur_plate = LRADC_SAMPLE_PRESSURE; |
| 696 | mxs_lradc_setup_ts_pressure(lradc, TS_CH_XP, TS_CH_YM); |
| 697 | } |
| 698 | |
| 699 | static void mxs_lradc_enable_touch_detection(struct mxs_lradc *lradc) |
| 700 | { |
| 701 | mxs_lradc_setup_touch_detection(lradc); |
| 702 | |
| 703 | lradc->cur_plate = LRADC_TOUCH; |
| 704 | mxs_lradc_reg_clear(lradc, LRADC_CTRL1_TOUCH_DETECT_IRQ | |
| 705 | LRADC_CTRL1_TOUCH_DETECT_IRQ_EN, LRADC_CTRL1); |
| 706 | mxs_lradc_reg_set(lradc, LRADC_CTRL1_TOUCH_DETECT_IRQ_EN, LRADC_CTRL1); |
| 707 | } |
| 708 | |
| 709 | static void mxs_lradc_report_ts_event(struct mxs_lradc *lradc) |
| 710 | { |
| 711 | input_report_abs(lradc->ts_input, ABS_X, lradc->ts_x_pos); |
| 712 | input_report_abs(lradc->ts_input, ABS_Y, lradc->ts_y_pos); |
| 713 | input_report_abs(lradc->ts_input, ABS_PRESSURE, lradc->ts_pressure); |
| 714 | input_report_key(lradc->ts_input, BTN_TOUCH, 1); |
| 715 | input_sync(lradc->ts_input); |
| 716 | } |
| 717 | |
| 718 | static void mxs_lradc_complete_touch_event(struct mxs_lradc *lradc) |
| 719 | { |
| 720 | mxs_lradc_setup_touch_detection(lradc); |
| 721 | lradc->cur_plate = LRADC_SAMPLE_VALID; |
| 722 | /* |
| 723 | * start a dummy conversion to burn time to settle the signals |
| 724 | * note: we are not interested in the conversion's value |
| 725 | */ |
| 726 | mxs_lradc_reg_wrt(lradc, 0, LRADC_CH(5)); |
| 727 | mxs_lradc_reg_clear(lradc, LRADC_CTRL1_LRADC_IRQ(5), LRADC_CTRL1); |
| 728 | mxs_lradc_reg_set(lradc, LRADC_CTRL1_LRADC_IRQ_EN(5), LRADC_CTRL1); |
| 729 | mxs_lradc_reg_wrt(lradc, LRADC_DELAY_TRIGGER(1 << 5) | |
| 730 | LRADC_DELAY_KICK | LRADC_DELAY_DELAY(10), /* waste 5 ms */ |
| 731 | LRADC_DELAY(2)); |
| 732 | } |
| 733 | |
| 734 | /* |
| 735 | * in order to avoid false measurements, report only samples where |
| 736 | * the surface is still touched after the position measurement |
| 737 | */ |
| 738 | static void mxs_lradc_finish_touch_event(struct mxs_lradc *lradc, bool valid) |
| 739 | { |
| 740 | /* if it is still touched, report the sample */ |
| 741 | if (valid && mxs_lradc_check_touch_event(lradc)) { |
| 742 | lradc->ts_valid = true; |
| 743 | mxs_lradc_report_ts_event(lradc); |
| 744 | } |
| 745 | |
| 746 | /* if it is even still touched, continue with the next measurement */ |
| 747 | if (mxs_lradc_check_touch_event(lradc)) { |
| 748 | mxs_lradc_prepare_y_pos(lradc); |
| 749 | return; |
| 750 | } |
| 751 | |
| 752 | if (lradc->ts_valid) { |
| 753 | /* signal the release */ |
| 754 | lradc->ts_valid = false; |
| 755 | input_report_key(lradc->ts_input, BTN_TOUCH, 0); |
| 756 | input_sync(lradc->ts_input); |
| 757 | } |
| 758 | |
| 759 | /* if it is released, wait for the next touch via IRQ */ |
Juergen Beisert | 760dbe1 | 2014-02-24 14:39:00 +0000 | [diff] [blame] | 760 | lradc->cur_plate = LRADC_TOUCH; |
Juergen Beisert | dee0530 | 2013-09-23 15:36:00 +0100 | [diff] [blame] | 761 | mxs_lradc_reg_clear(lradc, LRADC_CTRL1_TOUCH_DETECT_IRQ, LRADC_CTRL1); |
| 762 | mxs_lradc_reg_set(lradc, LRADC_CTRL1_TOUCH_DETECT_IRQ_EN, LRADC_CTRL1); |
| 763 | } |
| 764 | |
| 765 | /* touchscreen's state machine */ |
| 766 | static void mxs_lradc_handle_touch(struct mxs_lradc *lradc) |
| 767 | { |
| 768 | int val; |
| 769 | |
| 770 | switch (lradc->cur_plate) { |
| 771 | case LRADC_TOUCH: |
| 772 | /* |
| 773 | * start with the Y-pos, because it uses nearly the same plate |
| 774 | * settings like the touch detection |
| 775 | */ |
| 776 | if (mxs_lradc_check_touch_event(lradc)) { |
| 777 | mxs_lradc_reg_clear(lradc, |
| 778 | LRADC_CTRL1_TOUCH_DETECT_IRQ_EN, |
| 779 | LRADC_CTRL1); |
| 780 | mxs_lradc_prepare_y_pos(lradc); |
| 781 | } |
| 782 | mxs_lradc_reg_clear(lradc, LRADC_CTRL1_TOUCH_DETECT_IRQ, |
| 783 | LRADC_CTRL1); |
| 784 | return; |
| 785 | |
| 786 | case LRADC_SAMPLE_Y: |
| 787 | val = mxs_lradc_read_ts_channel(lradc); |
| 788 | if (val < 0) { |
| 789 | mxs_lradc_enable_touch_detection(lradc); /* re-start */ |
| 790 | return; |
| 791 | } |
| 792 | lradc->ts_y_pos = val; |
| 793 | mxs_lradc_prepare_x_pos(lradc); |
| 794 | return; |
| 795 | |
| 796 | case LRADC_SAMPLE_X: |
| 797 | val = mxs_lradc_read_ts_channel(lradc); |
| 798 | if (val < 0) { |
| 799 | mxs_lradc_enable_touch_detection(lradc); /* re-start */ |
| 800 | return; |
| 801 | } |
| 802 | lradc->ts_x_pos = val; |
| 803 | mxs_lradc_prepare_pressure(lradc); |
| 804 | return; |
| 805 | |
| 806 | case LRADC_SAMPLE_PRESSURE: |
| 807 | lradc->ts_pressure = |
| 808 | mxs_lradc_read_ts_pressure(lradc, TS_CH_XP, TS_CH_YM); |
| 809 | mxs_lradc_complete_touch_event(lradc); |
| 810 | return; |
| 811 | |
| 812 | case LRADC_SAMPLE_VALID: |
| 813 | val = mxs_lradc_read_ts_channel(lradc); /* ignore the value */ |
| 814 | mxs_lradc_finish_touch_event(lradc, 1); |
| 815 | break; |
| 816 | } |
| 817 | } |
| 818 | |
Marek Vasut | bc2c90c | 2012-08-12 16:21:00 +0100 | [diff] [blame] | 819 | /* |
| 820 | * Raw I/O operations |
| 821 | */ |
Alexandre Belloni | c8231a9 | 2013-12-06 19:31:00 +0000 | [diff] [blame] | 822 | static int mxs_lradc_read_single(struct iio_dev *iio_dev, int chan, int *val) |
Marek Vasut | bc2c90c | 2012-08-12 16:21:00 +0100 | [diff] [blame] | 823 | { |
| 824 | struct mxs_lradc *lradc = iio_priv(iio_dev); |
| 825 | int ret; |
| 826 | |
Marek Vasut | bc2c90c | 2012-08-12 16:21:00 +0100 | [diff] [blame] | 827 | /* |
| 828 | * See if there is no buffered operation in progess. If there is, simply |
| 829 | * bail out. This can be improved to support both buffered and raw IO at |
| 830 | * the same time, yet the code becomes horribly complicated. Therefore I |
| 831 | * applied KISS principle here. |
| 832 | */ |
| 833 | ret = mutex_trylock(&lradc->lock); |
| 834 | if (!ret) |
| 835 | return -EBUSY; |
| 836 | |
Wolfram Sang | 16735d0 | 2013-11-14 14:32:02 -0800 | [diff] [blame] | 837 | reinit_completion(&lradc->completion); |
Marek Vasut | bc2c90c | 2012-08-12 16:21:00 +0100 | [diff] [blame] | 838 | |
| 839 | /* |
| 840 | * No buffered operation in progress, map the channel and trigger it. |
| 841 | * Virtual channel 0 is always used here as the others are always not |
| 842 | * used if doing raw sampling. |
| 843 | */ |
Juergen Beisert | 8c06f71 | 2013-09-23 15:36:00 +0100 | [diff] [blame] | 844 | if (lradc->soc == IMX28_LRADC) |
| 845 | mxs_lradc_reg_clear(lradc, LRADC_CTRL1_MX28_LRADC_IRQ_EN_MASK, |
Juergen Beisert | f0b83cc | 2013-09-23 15:36:00 +0100 | [diff] [blame] | 846 | LRADC_CTRL1); |
| 847 | mxs_lradc_reg_clear(lradc, 0xff, LRADC_CTRL0); |
Marek Vasut | bc2c90c | 2012-08-12 16:21:00 +0100 | [diff] [blame] | 848 | |
Marek Vasut | 06ddd35 | 2013-01-11 23:35:00 +0000 | [diff] [blame] | 849 | /* Clean the slot's previous content, then set new one. */ |
Juergen Beisert | f0b83cc | 2013-09-23 15:36:00 +0100 | [diff] [blame] | 850 | mxs_lradc_reg_clear(lradc, LRADC_CTRL4_LRADCSELECT_MASK(0), LRADC_CTRL4); |
Alexandre Belloni | c8231a9 | 2013-12-06 19:31:00 +0000 | [diff] [blame] | 851 | mxs_lradc_reg_set(lradc, chan, LRADC_CTRL4); |
Marek Vasut | 06ddd35 | 2013-01-11 23:35:00 +0000 | [diff] [blame] | 852 | |
Juergen Beisert | f0b83cc | 2013-09-23 15:36:00 +0100 | [diff] [blame] | 853 | mxs_lradc_reg_wrt(lradc, 0, LRADC_CH(0)); |
Marek Vasut | bc2c90c | 2012-08-12 16:21:00 +0100 | [diff] [blame] | 854 | |
| 855 | /* Enable the IRQ and start sampling the channel. */ |
Juergen Beisert | f0b83cc | 2013-09-23 15:36:00 +0100 | [diff] [blame] | 856 | mxs_lradc_reg_set(lradc, LRADC_CTRL1_LRADC_IRQ_EN(0), LRADC_CTRL1); |
| 857 | mxs_lradc_reg_set(lradc, 1 << 0, LRADC_CTRL0); |
Marek Vasut | bc2c90c | 2012-08-12 16:21:00 +0100 | [diff] [blame] | 858 | |
| 859 | /* Wait for completion on the channel, 1 second max. */ |
| 860 | ret = wait_for_completion_killable_timeout(&lradc->completion, HZ); |
| 861 | if (!ret) |
| 862 | ret = -ETIMEDOUT; |
| 863 | if (ret < 0) |
| 864 | goto err; |
| 865 | |
| 866 | /* Read the data. */ |
| 867 | *val = readl(lradc->base + LRADC_CH(0)) & LRADC_CH_VALUE_MASK; |
| 868 | ret = IIO_VAL_INT; |
| 869 | |
| 870 | err: |
Juergen Beisert | f0b83cc | 2013-09-23 15:36:00 +0100 | [diff] [blame] | 871 | mxs_lradc_reg_clear(lradc, LRADC_CTRL1_LRADC_IRQ_EN(0), LRADC_CTRL1); |
Marek Vasut | bc2c90c | 2012-08-12 16:21:00 +0100 | [diff] [blame] | 872 | |
| 873 | mutex_unlock(&lradc->lock); |
| 874 | |
| 875 | return ret; |
| 876 | } |
| 877 | |
Alexandre Belloni | c8231a9 | 2013-12-06 19:31:00 +0000 | [diff] [blame] | 878 | static int mxs_lradc_read_temp(struct iio_dev *iio_dev, int *val) |
| 879 | { |
| 880 | int ret, min, max; |
| 881 | |
| 882 | ret = mxs_lradc_read_single(iio_dev, 8, &min); |
| 883 | if (ret != IIO_VAL_INT) |
| 884 | return ret; |
| 885 | |
| 886 | ret = mxs_lradc_read_single(iio_dev, 9, &max); |
| 887 | if (ret != IIO_VAL_INT) |
| 888 | return ret; |
| 889 | |
| 890 | *val = max - min; |
| 891 | |
| 892 | return IIO_VAL_INT; |
| 893 | } |
| 894 | |
| 895 | static int mxs_lradc_read_raw(struct iio_dev *iio_dev, |
| 896 | const struct iio_chan_spec *chan, |
| 897 | int *val, int *val2, long m) |
| 898 | { |
Hector Palacios | f6db68a | 2013-12-23 17:48:00 +0000 | [diff] [blame] | 899 | struct mxs_lradc *lradc = iio_priv(iio_dev); |
| 900 | |
Alexandre Belloni | c8231a9 | 2013-12-06 19:31:00 +0000 | [diff] [blame] | 901 | /* Check for invalid channel */ |
| 902 | if (chan->channel > LRADC_MAX_TOTAL_CHANS) |
| 903 | return -EINVAL; |
| 904 | |
| 905 | switch (m) { |
| 906 | case IIO_CHAN_INFO_RAW: |
| 907 | if (chan->type == IIO_TEMP) |
| 908 | return mxs_lradc_read_temp(iio_dev, val); |
| 909 | |
| 910 | return mxs_lradc_read_single(iio_dev, chan->channel, val); |
| 911 | |
| 912 | case IIO_CHAN_INFO_SCALE: |
| 913 | if (chan->type == IIO_TEMP) { |
| 914 | /* From the datasheet, we have to multiply by 1.012 and |
| 915 | * divide by 4 |
| 916 | */ |
| 917 | *val = 0; |
| 918 | *val2 = 253000; |
| 919 | return IIO_VAL_INT_PLUS_MICRO; |
| 920 | } |
| 921 | |
Hector Palacios | f6db68a | 2013-12-23 17:48:00 +0000 | [diff] [blame] | 922 | *val = lradc->vref_mv[chan->channel]; |
Hector Palacios | aba70f2 | 2013-12-23 17:48:00 +0000 | [diff] [blame] | 923 | *val2 = chan->scan_type.realbits - |
Alexandre Belloni | 38125b2 | 2013-12-23 17:48:00 +0000 | [diff] [blame] | 924 | test_bit(chan->channel, &lradc->is_divided); |
Hector Palacios | f6db68a | 2013-12-23 17:48:00 +0000 | [diff] [blame] | 925 | return IIO_VAL_FRACTIONAL_LOG2; |
Alexandre Belloni | c8231a9 | 2013-12-06 19:31:00 +0000 | [diff] [blame] | 926 | |
| 927 | case IIO_CHAN_INFO_OFFSET: |
| 928 | if (chan->type == IIO_TEMP) { |
| 929 | /* The calculated value from the ADC is in Kelvin, we |
| 930 | * want Celsius for hwmon so the offset is |
| 931 | * -272.15 * scale |
| 932 | */ |
| 933 | *val = -1075; |
| 934 | *val2 = 691699; |
| 935 | |
| 936 | return IIO_VAL_INT_PLUS_MICRO; |
| 937 | } |
| 938 | |
| 939 | return -EINVAL; |
| 940 | |
| 941 | default: |
| 942 | break; |
| 943 | } |
| 944 | |
| 945 | return -EINVAL; |
| 946 | } |
| 947 | |
Hector Palacios | aba70f2 | 2013-12-23 17:48:00 +0000 | [diff] [blame] | 948 | static int mxs_lradc_write_raw(struct iio_dev *iio_dev, |
| 949 | const struct iio_chan_spec *chan, |
| 950 | int val, int val2, long m) |
| 951 | { |
| 952 | struct mxs_lradc *lradc = iio_priv(iio_dev); |
| 953 | struct mxs_lradc_scale *scale_avail = |
| 954 | lradc->scale_avail[chan->channel]; |
| 955 | int ret; |
| 956 | |
| 957 | ret = mutex_trylock(&lradc->lock); |
| 958 | if (!ret) |
| 959 | return -EBUSY; |
| 960 | |
| 961 | switch (m) { |
| 962 | case IIO_CHAN_INFO_SCALE: |
| 963 | ret = -EINVAL; |
| 964 | if (val == scale_avail[MXS_LRADC_DIV_DISABLED].integer && |
| 965 | val2 == scale_avail[MXS_LRADC_DIV_DISABLED].nano) { |
| 966 | /* divider by two disabled */ |
| 967 | writel(1 << LRADC_CTRL2_DIVIDE_BY_TWO_OFFSET, |
| 968 | lradc->base + LRADC_CTRL2 + STMP_OFFSET_REG_CLR); |
Alexandre Belloni | 38125b2 | 2013-12-23 17:48:00 +0000 | [diff] [blame] | 969 | clear_bit(chan->channel, &lradc->is_divided); |
Hector Palacios | aba70f2 | 2013-12-23 17:48:00 +0000 | [diff] [blame] | 970 | ret = 0; |
| 971 | } else if (val == scale_avail[MXS_LRADC_DIV_ENABLED].integer && |
| 972 | val2 == scale_avail[MXS_LRADC_DIV_ENABLED].nano) { |
| 973 | /* divider by two enabled */ |
| 974 | writel(1 << LRADC_CTRL2_DIVIDE_BY_TWO_OFFSET, |
| 975 | lradc->base + LRADC_CTRL2 + STMP_OFFSET_REG_SET); |
Alexandre Belloni | 38125b2 | 2013-12-23 17:48:00 +0000 | [diff] [blame] | 976 | set_bit(chan->channel, &lradc->is_divided); |
Hector Palacios | aba70f2 | 2013-12-23 17:48:00 +0000 | [diff] [blame] | 977 | ret = 0; |
| 978 | } |
| 979 | |
| 980 | break; |
| 981 | default: |
| 982 | ret = -EINVAL; |
| 983 | break; |
| 984 | } |
| 985 | |
| 986 | mutex_unlock(&lradc->lock); |
| 987 | |
| 988 | return ret; |
| 989 | } |
| 990 | |
| 991 | static int mxs_lradc_write_raw_get_fmt(struct iio_dev *iio_dev, |
| 992 | const struct iio_chan_spec *chan, |
| 993 | long m) |
| 994 | { |
| 995 | return IIO_VAL_INT_PLUS_NANO; |
| 996 | } |
| 997 | |
Hector Palacios | d5acf59 | 2013-12-23 17:48:00 +0000 | [diff] [blame] | 998 | static ssize_t mxs_lradc_show_scale_available_ch(struct device *dev, |
| 999 | struct device_attribute *attr, |
| 1000 | char *buf, |
| 1001 | int ch) |
| 1002 | { |
| 1003 | struct iio_dev *iio = dev_to_iio_dev(dev); |
| 1004 | struct mxs_lradc *lradc = iio_priv(iio); |
| 1005 | int i, len = 0; |
| 1006 | |
| 1007 | for (i = 0; i < ARRAY_SIZE(lradc->scale_avail[ch]); i++) |
| 1008 | len += sprintf(buf + len, "%d.%09u ", |
| 1009 | lradc->scale_avail[ch][i].integer, |
| 1010 | lradc->scale_avail[ch][i].nano); |
| 1011 | |
| 1012 | len += sprintf(buf + len, "\n"); |
| 1013 | |
| 1014 | return len; |
| 1015 | } |
| 1016 | |
| 1017 | static ssize_t mxs_lradc_show_scale_available(struct device *dev, |
| 1018 | struct device_attribute *attr, |
| 1019 | char *buf) |
| 1020 | { |
| 1021 | struct iio_dev_attr *iio_attr = to_iio_dev_attr(attr); |
| 1022 | |
| 1023 | return mxs_lradc_show_scale_available_ch(dev, attr, buf, |
| 1024 | iio_attr->address); |
| 1025 | } |
| 1026 | |
| 1027 | #define SHOW_SCALE_AVAILABLE_ATTR(ch) \ |
| 1028 | static IIO_DEVICE_ATTR(in_voltage##ch##_scale_available, S_IRUGO, \ |
| 1029 | mxs_lradc_show_scale_available, NULL, ch) |
| 1030 | |
| 1031 | SHOW_SCALE_AVAILABLE_ATTR(0); |
| 1032 | SHOW_SCALE_AVAILABLE_ATTR(1); |
| 1033 | SHOW_SCALE_AVAILABLE_ATTR(2); |
| 1034 | SHOW_SCALE_AVAILABLE_ATTR(3); |
| 1035 | SHOW_SCALE_AVAILABLE_ATTR(4); |
| 1036 | SHOW_SCALE_AVAILABLE_ATTR(5); |
| 1037 | SHOW_SCALE_AVAILABLE_ATTR(6); |
| 1038 | SHOW_SCALE_AVAILABLE_ATTR(7); |
Hector Palacios | d5acf59 | 2013-12-23 17:48:00 +0000 | [diff] [blame] | 1039 | SHOW_SCALE_AVAILABLE_ATTR(10); |
| 1040 | SHOW_SCALE_AVAILABLE_ATTR(11); |
| 1041 | SHOW_SCALE_AVAILABLE_ATTR(12); |
| 1042 | SHOW_SCALE_AVAILABLE_ATTR(13); |
| 1043 | SHOW_SCALE_AVAILABLE_ATTR(14); |
| 1044 | SHOW_SCALE_AVAILABLE_ATTR(15); |
| 1045 | |
| 1046 | static struct attribute *mxs_lradc_attributes[] = { |
| 1047 | &iio_dev_attr_in_voltage0_scale_available.dev_attr.attr, |
| 1048 | &iio_dev_attr_in_voltage1_scale_available.dev_attr.attr, |
| 1049 | &iio_dev_attr_in_voltage2_scale_available.dev_attr.attr, |
| 1050 | &iio_dev_attr_in_voltage3_scale_available.dev_attr.attr, |
| 1051 | &iio_dev_attr_in_voltage4_scale_available.dev_attr.attr, |
| 1052 | &iio_dev_attr_in_voltage5_scale_available.dev_attr.attr, |
| 1053 | &iio_dev_attr_in_voltage6_scale_available.dev_attr.attr, |
| 1054 | &iio_dev_attr_in_voltage7_scale_available.dev_attr.attr, |
Hector Palacios | d5acf59 | 2013-12-23 17:48:00 +0000 | [diff] [blame] | 1055 | &iio_dev_attr_in_voltage10_scale_available.dev_attr.attr, |
| 1056 | &iio_dev_attr_in_voltage11_scale_available.dev_attr.attr, |
| 1057 | &iio_dev_attr_in_voltage12_scale_available.dev_attr.attr, |
| 1058 | &iio_dev_attr_in_voltage13_scale_available.dev_attr.attr, |
| 1059 | &iio_dev_attr_in_voltage14_scale_available.dev_attr.attr, |
| 1060 | &iio_dev_attr_in_voltage15_scale_available.dev_attr.attr, |
| 1061 | NULL |
| 1062 | }; |
| 1063 | |
| 1064 | static const struct attribute_group mxs_lradc_attribute_group = { |
| 1065 | .attrs = mxs_lradc_attributes, |
| 1066 | }; |
| 1067 | |
Marek Vasut | bc2c90c | 2012-08-12 16:21:00 +0100 | [diff] [blame] | 1068 | static const struct iio_info mxs_lradc_iio_info = { |
| 1069 | .driver_module = THIS_MODULE, |
| 1070 | .read_raw = mxs_lradc_read_raw, |
Hector Palacios | aba70f2 | 2013-12-23 17:48:00 +0000 | [diff] [blame] | 1071 | .write_raw = mxs_lradc_write_raw, |
| 1072 | .write_raw_get_fmt = mxs_lradc_write_raw_get_fmt, |
Hector Palacios | d5acf59 | 2013-12-23 17:48:00 +0000 | [diff] [blame] | 1073 | .attrs = &mxs_lradc_attribute_group, |
Marek Vasut | bc2c90c | 2012-08-12 16:21:00 +0100 | [diff] [blame] | 1074 | }; |
| 1075 | |
Marek Vasut | 06ddd35 | 2013-01-11 23:35:00 +0000 | [diff] [blame] | 1076 | static int mxs_lradc_ts_open(struct input_dev *dev) |
| 1077 | { |
| 1078 | struct mxs_lradc *lradc = input_get_drvdata(dev); |
| 1079 | |
Marek Vasut | 06ddd35 | 2013-01-11 23:35:00 +0000 | [diff] [blame] | 1080 | /* Enable the touch-detect circuitry. */ |
Juergen Beisert | dee0530 | 2013-09-23 15:36:00 +0100 | [diff] [blame] | 1081 | mxs_lradc_enable_touch_detection(lradc); |
Marek Vasut | 06ddd35 | 2013-01-11 23:35:00 +0000 | [diff] [blame] | 1082 | |
| 1083 | return 0; |
| 1084 | } |
| 1085 | |
Juergen Beisert | dee0530 | 2013-09-23 15:36:00 +0100 | [diff] [blame] | 1086 | static void mxs_lradc_disable_ts(struct mxs_lradc *lradc) |
| 1087 | { |
| 1088 | /* stop all interrupts from firing */ |
| 1089 | mxs_lradc_reg_clear(lradc, LRADC_CTRL1_TOUCH_DETECT_IRQ_EN | |
| 1090 | LRADC_CTRL1_LRADC_IRQ_EN(2) | LRADC_CTRL1_LRADC_IRQ_EN(3) | |
| 1091 | LRADC_CTRL1_LRADC_IRQ_EN(4) | LRADC_CTRL1_LRADC_IRQ_EN(5), |
| 1092 | LRADC_CTRL1); |
| 1093 | |
| 1094 | /* Power-down touchscreen touch-detect circuitry. */ |
| 1095 | mxs_lradc_reg_clear(lradc, mxs_lradc_plate_mask(lradc), LRADC_CTRL0); |
| 1096 | } |
| 1097 | |
Marek Vasut | 06ddd35 | 2013-01-11 23:35:00 +0000 | [diff] [blame] | 1098 | static void mxs_lradc_ts_close(struct input_dev *dev) |
| 1099 | { |
| 1100 | struct mxs_lradc *lradc = input_get_drvdata(dev); |
| 1101 | |
Juergen Beisert | dee0530 | 2013-09-23 15:36:00 +0100 | [diff] [blame] | 1102 | mxs_lradc_disable_ts(lradc); |
Marek Vasut | 06ddd35 | 2013-01-11 23:35:00 +0000 | [diff] [blame] | 1103 | } |
| 1104 | |
| 1105 | static int mxs_lradc_ts_register(struct mxs_lradc *lradc) |
| 1106 | { |
| 1107 | struct input_dev *input; |
| 1108 | struct device *dev = lradc->dev; |
| 1109 | int ret; |
| 1110 | |
| 1111 | if (!lradc->use_touchscreen) |
| 1112 | return 0; |
| 1113 | |
| 1114 | input = input_allocate_device(); |
Joe Perches | f99a92c | 2013-10-23 12:14:53 -0700 | [diff] [blame] | 1115 | if (!input) |
Marek Vasut | 06ddd35 | 2013-01-11 23:35:00 +0000 | [diff] [blame] | 1116 | return -ENOMEM; |
Marek Vasut | 06ddd35 | 2013-01-11 23:35:00 +0000 | [diff] [blame] | 1117 | |
| 1118 | input->name = DRIVER_NAME; |
| 1119 | input->id.bustype = BUS_HOST; |
| 1120 | input->dev.parent = dev; |
| 1121 | input->open = mxs_lradc_ts_open; |
| 1122 | input->close = mxs_lradc_ts_close; |
| 1123 | |
| 1124 | __set_bit(EV_ABS, input->evbit); |
| 1125 | __set_bit(EV_KEY, input->evbit); |
| 1126 | __set_bit(BTN_TOUCH, input->keybit); |
Hector Palacios | 1eb70a9 | 2013-07-22 15:03:00 +0100 | [diff] [blame] | 1127 | input_set_abs_params(input, ABS_X, 0, LRADC_SINGLE_SAMPLE_MASK, 0, 0); |
| 1128 | input_set_abs_params(input, ABS_Y, 0, LRADC_SINGLE_SAMPLE_MASK, 0, 0); |
| 1129 | input_set_abs_params(input, ABS_PRESSURE, 0, LRADC_SINGLE_SAMPLE_MASK, |
| 1130 | 0, 0); |
Marek Vasut | 06ddd35 | 2013-01-11 23:35:00 +0000 | [diff] [blame] | 1131 | |
| 1132 | lradc->ts_input = input; |
| 1133 | input_set_drvdata(input, lradc); |
| 1134 | ret = input_register_device(input); |
| 1135 | if (ret) |
| 1136 | input_free_device(lradc->ts_input); |
| 1137 | |
| 1138 | return ret; |
| 1139 | } |
| 1140 | |
| 1141 | static void mxs_lradc_ts_unregister(struct mxs_lradc *lradc) |
| 1142 | { |
| 1143 | if (!lradc->use_touchscreen) |
| 1144 | return; |
| 1145 | |
Juergen Beisert | dee0530 | 2013-09-23 15:36:00 +0100 | [diff] [blame] | 1146 | mxs_lradc_disable_ts(lradc); |
Marek Vasut | 06ddd35 | 2013-01-11 23:35:00 +0000 | [diff] [blame] | 1147 | input_unregister_device(lradc->ts_input); |
| 1148 | } |
| 1149 | |
| 1150 | /* |
Marek Vasut | bc2c90c | 2012-08-12 16:21:00 +0100 | [diff] [blame] | 1151 | * IRQ Handling |
| 1152 | */ |
| 1153 | static irqreturn_t mxs_lradc_handle_irq(int irq, void *data) |
| 1154 | { |
| 1155 | struct iio_dev *iio = data; |
| 1156 | struct mxs_lradc *lradc = iio_priv(iio); |
| 1157 | unsigned long reg = readl(lradc->base + LRADC_CTRL1); |
Marek Vasut | 06ddd35 | 2013-01-11 23:35:00 +0000 | [diff] [blame] | 1158 | const uint32_t ts_irq_mask = |
Juergen Beisert | dee0530 | 2013-09-23 15:36:00 +0100 | [diff] [blame] | 1159 | LRADC_CTRL1_TOUCH_DETECT_IRQ | |
| 1160 | LRADC_CTRL1_LRADC_IRQ(2) | |
| 1161 | LRADC_CTRL1_LRADC_IRQ(3) | |
| 1162 | LRADC_CTRL1_LRADC_IRQ(4) | |
| 1163 | LRADC_CTRL1_LRADC_IRQ(5); |
Marek Vasut | bc2c90c | 2012-08-12 16:21:00 +0100 | [diff] [blame] | 1164 | |
Juergen Beisert | f0b83cc | 2013-09-23 15:36:00 +0100 | [diff] [blame] | 1165 | if (!(reg & mxs_lradc_irq_mask(lradc))) |
Marek Vasut | bc2c90c | 2012-08-12 16:21:00 +0100 | [diff] [blame] | 1166 | return IRQ_NONE; |
| 1167 | |
Juergen Beisert | dee0530 | 2013-09-23 15:36:00 +0100 | [diff] [blame] | 1168 | if (lradc->use_touchscreen && (reg & ts_irq_mask)) |
| 1169 | mxs_lradc_handle_touch(lradc); |
Marek Vasut | bc2c90c | 2012-08-12 16:21:00 +0100 | [diff] [blame] | 1170 | |
| 1171 | if (iio_buffer_enabled(iio)) |
| 1172 | iio_trigger_poll(iio->trig, iio_get_time_ns()); |
| 1173 | else if (reg & LRADC_CTRL1_LRADC_IRQ(0)) |
| 1174 | complete(&lradc->completion); |
| 1175 | |
Juergen Beisert | f0b83cc | 2013-09-23 15:36:00 +0100 | [diff] [blame] | 1176 | mxs_lradc_reg_clear(lradc, reg & mxs_lradc_irq_mask(lradc), LRADC_CTRL1); |
Marek Vasut | bc2c90c | 2012-08-12 16:21:00 +0100 | [diff] [blame] | 1177 | |
| 1178 | return IRQ_HANDLED; |
| 1179 | } |
| 1180 | |
| 1181 | /* |
| 1182 | * Trigger handling |
| 1183 | */ |
| 1184 | static irqreturn_t mxs_lradc_trigger_handler(int irq, void *p) |
| 1185 | { |
| 1186 | struct iio_poll_func *pf = p; |
| 1187 | struct iio_dev *iio = pf->indio_dev; |
| 1188 | struct mxs_lradc *lradc = iio_priv(iio); |
Marek Vasut | bc2c90c | 2012-08-12 16:21:00 +0100 | [diff] [blame] | 1189 | const uint32_t chan_value = LRADC_CH_ACCUMULATE | |
| 1190 | ((LRADC_DELAY_TIMER_LOOP - 1) << LRADC_CH_NUM_SAMPLES_OFFSET); |
Fabio Estevam | 7b7a4ef | 2013-01-07 23:05:17 -0200 | [diff] [blame] | 1191 | unsigned int i, j = 0; |
Marek Vasut | bc2c90c | 2012-08-12 16:21:00 +0100 | [diff] [blame] | 1192 | |
Michał Mirosław | f4914e5 | 2013-05-04 14:19:00 +0100 | [diff] [blame] | 1193 | for_each_set_bit(i, iio->active_scan_mask, LRADC_MAX_TOTAL_CHANS) { |
Marek Vasut | bc2c90c | 2012-08-12 16:21:00 +0100 | [diff] [blame] | 1194 | lradc->buffer[j] = readl(lradc->base + LRADC_CH(j)); |
Juergen Beisert | f0b83cc | 2013-09-23 15:36:00 +0100 | [diff] [blame] | 1195 | mxs_lradc_reg_wrt(lradc, chan_value, LRADC_CH(j)); |
Marek Vasut | bc2c90c | 2012-08-12 16:21:00 +0100 | [diff] [blame] | 1196 | lradc->buffer[j] &= LRADC_CH_VALUE_MASK; |
| 1197 | lradc->buffer[j] /= LRADC_DELAY_TIMER_LOOP; |
| 1198 | j++; |
| 1199 | } |
| 1200 | |
Lars-Peter Clausen | 4fa10de | 2013-09-19 13:59:00 +0100 | [diff] [blame] | 1201 | iio_push_to_buffers_with_timestamp(iio, lradc->buffer, pf->timestamp); |
Marek Vasut | bc2c90c | 2012-08-12 16:21:00 +0100 | [diff] [blame] | 1202 | |
| 1203 | iio_trigger_notify_done(iio->trig); |
| 1204 | |
| 1205 | return IRQ_HANDLED; |
| 1206 | } |
| 1207 | |
| 1208 | static int mxs_lradc_configure_trigger(struct iio_trigger *trig, bool state) |
| 1209 | { |
Lars-Peter Clausen | 1e9663c | 2013-03-25 08:58:00 +0000 | [diff] [blame] | 1210 | struct iio_dev *iio = iio_trigger_get_drvdata(trig); |
Marek Vasut | bc2c90c | 2012-08-12 16:21:00 +0100 | [diff] [blame] | 1211 | struct mxs_lradc *lradc = iio_priv(iio); |
| 1212 | const uint32_t st = state ? STMP_OFFSET_REG_SET : STMP_OFFSET_REG_CLR; |
| 1213 | |
Juergen Beisert | f0b83cc | 2013-09-23 15:36:00 +0100 | [diff] [blame] | 1214 | mxs_lradc_reg_wrt(lradc, LRADC_DELAY_KICK, LRADC_DELAY(0) + st); |
Marek Vasut | bc2c90c | 2012-08-12 16:21:00 +0100 | [diff] [blame] | 1215 | |
| 1216 | return 0; |
| 1217 | } |
| 1218 | |
| 1219 | static const struct iio_trigger_ops mxs_lradc_trigger_ops = { |
| 1220 | .owner = THIS_MODULE, |
| 1221 | .set_trigger_state = &mxs_lradc_configure_trigger, |
| 1222 | }; |
| 1223 | |
| 1224 | static int mxs_lradc_trigger_init(struct iio_dev *iio) |
| 1225 | { |
| 1226 | int ret; |
| 1227 | struct iio_trigger *trig; |
Marek Vasut | e1b1fa6 | 2013-06-29 22:20:00 +0100 | [diff] [blame] | 1228 | struct mxs_lradc *lradc = iio_priv(iio); |
Marek Vasut | bc2c90c | 2012-08-12 16:21:00 +0100 | [diff] [blame] | 1229 | |
| 1230 | trig = iio_trigger_alloc("%s-dev%i", iio->name, iio->id); |
| 1231 | if (trig == NULL) |
| 1232 | return -ENOMEM; |
| 1233 | |
Marek Vasut | e1b1fa6 | 2013-06-29 22:20:00 +0100 | [diff] [blame] | 1234 | trig->dev.parent = lradc->dev; |
Lars-Peter Clausen | 1e9663c | 2013-03-25 08:58:00 +0000 | [diff] [blame] | 1235 | iio_trigger_set_drvdata(trig, iio); |
Marek Vasut | bc2c90c | 2012-08-12 16:21:00 +0100 | [diff] [blame] | 1236 | trig->ops = &mxs_lradc_trigger_ops; |
| 1237 | |
| 1238 | ret = iio_trigger_register(trig); |
| 1239 | if (ret) { |
| 1240 | iio_trigger_free(trig); |
| 1241 | return ret; |
| 1242 | } |
| 1243 | |
Marek Vasut | e1b1fa6 | 2013-06-29 22:20:00 +0100 | [diff] [blame] | 1244 | lradc->trig = trig; |
Marek Vasut | bc2c90c | 2012-08-12 16:21:00 +0100 | [diff] [blame] | 1245 | |
| 1246 | return 0; |
| 1247 | } |
| 1248 | |
| 1249 | static void mxs_lradc_trigger_remove(struct iio_dev *iio) |
| 1250 | { |
Marek Vasut | e1b1fa6 | 2013-06-29 22:20:00 +0100 | [diff] [blame] | 1251 | struct mxs_lradc *lradc = iio_priv(iio); |
| 1252 | |
| 1253 | iio_trigger_unregister(lradc->trig); |
| 1254 | iio_trigger_free(lradc->trig); |
Marek Vasut | bc2c90c | 2012-08-12 16:21:00 +0100 | [diff] [blame] | 1255 | } |
| 1256 | |
| 1257 | static int mxs_lradc_buffer_preenable(struct iio_dev *iio) |
| 1258 | { |
| 1259 | struct mxs_lradc *lradc = iio_priv(iio); |
Marek Vasut | 06ddd35 | 2013-01-11 23:35:00 +0000 | [diff] [blame] | 1260 | int ret = 0, chan, ofs = 0; |
| 1261 | unsigned long enable = 0; |
| 1262 | uint32_t ctrl4_set = 0; |
| 1263 | uint32_t ctrl4_clr = 0; |
Marek Vasut | bc2c90c | 2012-08-12 16:21:00 +0100 | [diff] [blame] | 1264 | uint32_t ctrl1_irq = 0; |
| 1265 | const uint32_t chan_value = LRADC_CH_ACCUMULATE | |
| 1266 | ((LRADC_DELAY_TIMER_LOOP - 1) << LRADC_CH_NUM_SAMPLES_OFFSET); |
Michał Mirosław | c80712c | 2013-05-04 14:19:00 +0100 | [diff] [blame] | 1267 | const int len = bitmap_weight(iio->active_scan_mask, LRADC_MAX_TOTAL_CHANS); |
Marek Vasut | bc2c90c | 2012-08-12 16:21:00 +0100 | [diff] [blame] | 1268 | |
| 1269 | if (!len) |
| 1270 | return -EINVAL; |
| 1271 | |
| 1272 | /* |
| 1273 | * Lock the driver so raw access can not be done during buffered |
| 1274 | * operation. This simplifies the code a lot. |
| 1275 | */ |
| 1276 | ret = mutex_trylock(&lradc->lock); |
| 1277 | if (!ret) |
| 1278 | return -EBUSY; |
| 1279 | |
| 1280 | lradc->buffer = kmalloc(len * sizeof(*lradc->buffer), GFP_KERNEL); |
| 1281 | if (!lradc->buffer) { |
| 1282 | ret = -ENOMEM; |
| 1283 | goto err_mem; |
| 1284 | } |
| 1285 | |
Juergen Beisert | 8c06f71 | 2013-09-23 15:36:00 +0100 | [diff] [blame] | 1286 | if (lradc->soc == IMX28_LRADC) |
| 1287 | mxs_lradc_reg_clear(lradc, LRADC_CTRL1_MX28_LRADC_IRQ_EN_MASK, |
Juergen Beisert | f0b83cc | 2013-09-23 15:36:00 +0100 | [diff] [blame] | 1288 | LRADC_CTRL1); |
| 1289 | mxs_lradc_reg_clear(lradc, 0xff, LRADC_CTRL0); |
Marek Vasut | bc2c90c | 2012-08-12 16:21:00 +0100 | [diff] [blame] | 1290 | |
Michał Mirosław | c80712c | 2013-05-04 14:19:00 +0100 | [diff] [blame] | 1291 | for_each_set_bit(chan, iio->active_scan_mask, LRADC_MAX_TOTAL_CHANS) { |
Marek Vasut | 06ddd35 | 2013-01-11 23:35:00 +0000 | [diff] [blame] | 1292 | ctrl4_set |= chan << LRADC_CTRL4_LRADCSELECT_OFFSET(ofs); |
| 1293 | ctrl4_clr |= LRADC_CTRL4_LRADCSELECT_MASK(ofs); |
Marek Vasut | bc2c90c | 2012-08-12 16:21:00 +0100 | [diff] [blame] | 1294 | ctrl1_irq |= LRADC_CTRL1_LRADC_IRQ_EN(ofs); |
Juergen Beisert | f0b83cc | 2013-09-23 15:36:00 +0100 | [diff] [blame] | 1295 | mxs_lradc_reg_wrt(lradc, chan_value, LRADC_CH(ofs)); |
Marek Vasut | 06ddd35 | 2013-01-11 23:35:00 +0000 | [diff] [blame] | 1296 | bitmap_set(&enable, ofs, 1); |
Marek Vasut | bc2c90c | 2012-08-12 16:21:00 +0100 | [diff] [blame] | 1297 | ofs++; |
Peter Senna Tschudin | 73327b4 | 2012-09-28 10:57:00 +0100 | [diff] [blame] | 1298 | } |
Marek Vasut | bc2c90c | 2012-08-12 16:21:00 +0100 | [diff] [blame] | 1299 | |
Juergen Beisert | f0b83cc | 2013-09-23 15:36:00 +0100 | [diff] [blame] | 1300 | mxs_lradc_reg_clear(lradc, LRADC_DELAY_TRIGGER_LRADCS_MASK | |
| 1301 | LRADC_DELAY_KICK, LRADC_DELAY(0)); |
| 1302 | mxs_lradc_reg_clear(lradc, ctrl4_clr, LRADC_CTRL4); |
| 1303 | mxs_lradc_reg_set(lradc, ctrl4_set, LRADC_CTRL4); |
| 1304 | mxs_lradc_reg_set(lradc, ctrl1_irq, LRADC_CTRL1); |
| 1305 | mxs_lradc_reg_set(lradc, enable << LRADC_DELAY_TRIGGER_LRADCS_OFFSET, |
| 1306 | LRADC_DELAY(0)); |
Marek Vasut | bc2c90c | 2012-08-12 16:21:00 +0100 | [diff] [blame] | 1307 | |
| 1308 | return 0; |
| 1309 | |
Marek Vasut | bc2c90c | 2012-08-12 16:21:00 +0100 | [diff] [blame] | 1310 | err_mem: |
| 1311 | mutex_unlock(&lradc->lock); |
| 1312 | return ret; |
| 1313 | } |
| 1314 | |
| 1315 | static int mxs_lradc_buffer_postdisable(struct iio_dev *iio) |
| 1316 | { |
| 1317 | struct mxs_lradc *lradc = iio_priv(iio); |
| 1318 | |
Juergen Beisert | f0b83cc | 2013-09-23 15:36:00 +0100 | [diff] [blame] | 1319 | mxs_lradc_reg_clear(lradc, LRADC_DELAY_TRIGGER_LRADCS_MASK | |
| 1320 | LRADC_DELAY_KICK, LRADC_DELAY(0)); |
Marek Vasut | bc2c90c | 2012-08-12 16:21:00 +0100 | [diff] [blame] | 1321 | |
Juergen Beisert | f0b83cc | 2013-09-23 15:36:00 +0100 | [diff] [blame] | 1322 | mxs_lradc_reg_clear(lradc, 0xff, LRADC_CTRL0); |
Juergen Beisert | 8c06f71 | 2013-09-23 15:36:00 +0100 | [diff] [blame] | 1323 | if (lradc->soc == IMX28_LRADC) |
| 1324 | mxs_lradc_reg_clear(lradc, LRADC_CTRL1_MX28_LRADC_IRQ_EN_MASK, |
Juergen Beisert | f0b83cc | 2013-09-23 15:36:00 +0100 | [diff] [blame] | 1325 | LRADC_CTRL1); |
Marek Vasut | bc2c90c | 2012-08-12 16:21:00 +0100 | [diff] [blame] | 1326 | |
| 1327 | kfree(lradc->buffer); |
| 1328 | mutex_unlock(&lradc->lock); |
| 1329 | |
| 1330 | return 0; |
| 1331 | } |
| 1332 | |
| 1333 | static bool mxs_lradc_validate_scan_mask(struct iio_dev *iio, |
| 1334 | const unsigned long *mask) |
| 1335 | { |
Marek Vasut | 06ddd35 | 2013-01-11 23:35:00 +0000 | [diff] [blame] | 1336 | struct mxs_lradc *lradc = iio_priv(iio); |
Michał Mirosław | f4914e5 | 2013-05-04 14:19:00 +0100 | [diff] [blame] | 1337 | const int map_chans = bitmap_weight(mask, LRADC_MAX_TOTAL_CHANS); |
Marek Vasut | 06ddd35 | 2013-01-11 23:35:00 +0000 | [diff] [blame] | 1338 | int rsvd_chans = 0; |
| 1339 | unsigned long rsvd_mask = 0; |
Marek Vasut | bc2c90c | 2012-08-12 16:21:00 +0100 | [diff] [blame] | 1340 | |
Marek Vasut | 06ddd35 | 2013-01-11 23:35:00 +0000 | [diff] [blame] | 1341 | if (lradc->use_touchbutton) |
| 1342 | rsvd_mask |= CHAN_MASK_TOUCHBUTTON; |
| 1343 | if (lradc->use_touchscreen == MXS_LRADC_TOUCHSCREEN_4WIRE) |
| 1344 | rsvd_mask |= CHAN_MASK_TOUCHSCREEN_4WIRE; |
| 1345 | if (lradc->use_touchscreen == MXS_LRADC_TOUCHSCREEN_5WIRE) |
| 1346 | rsvd_mask |= CHAN_MASK_TOUCHSCREEN_5WIRE; |
| 1347 | |
| 1348 | if (lradc->use_touchbutton) |
| 1349 | rsvd_chans++; |
| 1350 | if (lradc->use_touchscreen) |
| 1351 | rsvd_chans++; |
| 1352 | |
| 1353 | /* Test for attempts to map channels with special mode of operation. */ |
Michał Mirosław | f4914e5 | 2013-05-04 14:19:00 +0100 | [diff] [blame] | 1354 | if (bitmap_intersects(mask, &rsvd_mask, LRADC_MAX_TOTAL_CHANS)) |
Marek Vasut | 06ddd35 | 2013-01-11 23:35:00 +0000 | [diff] [blame] | 1355 | return false; |
| 1356 | |
| 1357 | /* Test for attempts to map more channels then available slots. */ |
| 1358 | if (map_chans + rsvd_chans > LRADC_MAX_MAPPED_CHANS) |
| 1359 | return false; |
| 1360 | |
| 1361 | return true; |
Marek Vasut | bc2c90c | 2012-08-12 16:21:00 +0100 | [diff] [blame] | 1362 | } |
| 1363 | |
| 1364 | static const struct iio_buffer_setup_ops mxs_lradc_buffer_ops = { |
| 1365 | .preenable = &mxs_lradc_buffer_preenable, |
| 1366 | .postenable = &iio_triggered_buffer_postenable, |
| 1367 | .predisable = &iio_triggered_buffer_predisable, |
| 1368 | .postdisable = &mxs_lradc_buffer_postdisable, |
| 1369 | .validate_scan_mask = &mxs_lradc_validate_scan_mask, |
| 1370 | }; |
| 1371 | |
| 1372 | /* |
| 1373 | * Driver initialization |
| 1374 | */ |
| 1375 | |
| 1376 | #define MXS_ADC_CHAN(idx, chan_type) { \ |
| 1377 | .type = (chan_type), \ |
| 1378 | .indexed = 1, \ |
| 1379 | .scan_index = (idx), \ |
Hector Palacios | f6db68a | 2013-12-23 17:48:00 +0000 | [diff] [blame] | 1380 | .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \ |
| 1381 | BIT(IIO_CHAN_INFO_SCALE), \ |
Marek Vasut | bc2c90c | 2012-08-12 16:21:00 +0100 | [diff] [blame] | 1382 | .channel = (idx), \ |
Hector Palacios | d5acf59 | 2013-12-23 17:48:00 +0000 | [diff] [blame] | 1383 | .address = (idx), \ |
Marek Vasut | bc2c90c | 2012-08-12 16:21:00 +0100 | [diff] [blame] | 1384 | .scan_type = { \ |
| 1385 | .sign = 'u', \ |
Hector Palacios | 1eb70a9 | 2013-07-22 15:03:00 +0100 | [diff] [blame] | 1386 | .realbits = LRADC_RESOLUTION, \ |
Marek Vasut | bc2c90c | 2012-08-12 16:21:00 +0100 | [diff] [blame] | 1387 | .storagebits = 32, \ |
| 1388 | }, \ |
| 1389 | } |
| 1390 | |
| 1391 | static const struct iio_chan_spec mxs_lradc_chan_spec[] = { |
| 1392 | MXS_ADC_CHAN(0, IIO_VOLTAGE), |
| 1393 | MXS_ADC_CHAN(1, IIO_VOLTAGE), |
| 1394 | MXS_ADC_CHAN(2, IIO_VOLTAGE), |
| 1395 | MXS_ADC_CHAN(3, IIO_VOLTAGE), |
| 1396 | MXS_ADC_CHAN(4, IIO_VOLTAGE), |
| 1397 | MXS_ADC_CHAN(5, IIO_VOLTAGE), |
| 1398 | MXS_ADC_CHAN(6, IIO_VOLTAGE), |
| 1399 | MXS_ADC_CHAN(7, IIO_VOLTAGE), /* VBATT */ |
Alexandre Belloni | c8231a9 | 2013-12-06 19:31:00 +0000 | [diff] [blame] | 1400 | /* Combined Temperature sensors */ |
| 1401 | { |
| 1402 | .type = IIO_TEMP, |
| 1403 | .indexed = 1, |
| 1404 | .scan_index = 8, |
| 1405 | .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | |
| 1406 | BIT(IIO_CHAN_INFO_OFFSET) | |
| 1407 | BIT(IIO_CHAN_INFO_SCALE), |
| 1408 | .channel = 8, |
| 1409 | .scan_type = {.sign = 'u', .realbits = 18, .storagebits = 32,}, |
| 1410 | }, |
Marek Vasut | bc2c90c | 2012-08-12 16:21:00 +0100 | [diff] [blame] | 1411 | MXS_ADC_CHAN(10, IIO_VOLTAGE), /* VDDIO */ |
| 1412 | MXS_ADC_CHAN(11, IIO_VOLTAGE), /* VTH */ |
| 1413 | MXS_ADC_CHAN(12, IIO_VOLTAGE), /* VDDA */ |
| 1414 | MXS_ADC_CHAN(13, IIO_VOLTAGE), /* VDDD */ |
| 1415 | MXS_ADC_CHAN(14, IIO_VOLTAGE), /* VBG */ |
| 1416 | MXS_ADC_CHAN(15, IIO_VOLTAGE), /* VDD5V */ |
| 1417 | }; |
| 1418 | |
Fabio Estevam | 947123d | 2013-07-10 03:36:00 +0100 | [diff] [blame] | 1419 | static int mxs_lradc_hw_init(struct mxs_lradc *lradc) |
Marek Vasut | bc2c90c | 2012-08-12 16:21:00 +0100 | [diff] [blame] | 1420 | { |
Marek Vasut | 06ddd35 | 2013-01-11 23:35:00 +0000 | [diff] [blame] | 1421 | /* The ADC always uses DELAY CHANNEL 0. */ |
| 1422 | const uint32_t adc_cfg = |
| 1423 | (1 << (LRADC_DELAY_TRIGGER_DELAYS_OFFSET + 0)) | |
Marek Vasut | bc2c90c | 2012-08-12 16:21:00 +0100 | [diff] [blame] | 1424 | (LRADC_DELAY_TIMER_PER << LRADC_DELAY_DELAY_OFFSET); |
| 1425 | |
Fabio Estevam | 947123d | 2013-07-10 03:36:00 +0100 | [diff] [blame] | 1426 | int ret = stmp_reset_block(lradc->base); |
| 1427 | if (ret) |
| 1428 | return ret; |
Marek Vasut | bc2c90c | 2012-08-12 16:21:00 +0100 | [diff] [blame] | 1429 | |
Marek Vasut | 06ddd35 | 2013-01-11 23:35:00 +0000 | [diff] [blame] | 1430 | /* Configure DELAY CHANNEL 0 for generic ADC sampling. */ |
Juergen Beisert | f0b83cc | 2013-09-23 15:36:00 +0100 | [diff] [blame] | 1431 | mxs_lradc_reg_wrt(lradc, adc_cfg, LRADC_DELAY(0)); |
Marek Vasut | 06ddd35 | 2013-01-11 23:35:00 +0000 | [diff] [blame] | 1432 | |
| 1433 | /* Disable remaining DELAY CHANNELs */ |
Juergen Beisert | f0b83cc | 2013-09-23 15:36:00 +0100 | [diff] [blame] | 1434 | mxs_lradc_reg_wrt(lradc, 0, LRADC_DELAY(1)); |
| 1435 | mxs_lradc_reg_wrt(lradc, 0, LRADC_DELAY(2)); |
| 1436 | mxs_lradc_reg_wrt(lradc, 0, LRADC_DELAY(3)); |
Marek Vasut | 06ddd35 | 2013-01-11 23:35:00 +0000 | [diff] [blame] | 1437 | |
| 1438 | /* Configure the touchscreen type */ |
Juergen Beisert | 8c06f71 | 2013-09-23 15:36:00 +0100 | [diff] [blame] | 1439 | if (lradc->soc == IMX28_LRADC) { |
| 1440 | mxs_lradc_reg_clear(lradc, LRADC_CTRL0_MX28_TOUCH_SCREEN_TYPE, |
Juergen Beisert | f0b83cc | 2013-09-23 15:36:00 +0100 | [diff] [blame] | 1441 | LRADC_CTRL0); |
Marek Vasut | 06ddd35 | 2013-01-11 23:35:00 +0000 | [diff] [blame] | 1442 | |
Juergen Beisert | f0b83cc | 2013-09-23 15:36:00 +0100 | [diff] [blame] | 1443 | if (lradc->use_touchscreen == MXS_LRADC_TOUCHSCREEN_5WIRE) |
| 1444 | mxs_lradc_reg_set(lradc, LRADC_CTRL0_MX28_TOUCH_SCREEN_TYPE, |
| 1445 | LRADC_CTRL0); |
Marek Vasut | 06ddd35 | 2013-01-11 23:35:00 +0000 | [diff] [blame] | 1446 | } |
Marek Vasut | bc2c90c | 2012-08-12 16:21:00 +0100 | [diff] [blame] | 1447 | |
| 1448 | /* Start internal temperature sensing. */ |
Juergen Beisert | f0b83cc | 2013-09-23 15:36:00 +0100 | [diff] [blame] | 1449 | mxs_lradc_reg_wrt(lradc, 0, LRADC_CTRL2); |
Fabio Estevam | 947123d | 2013-07-10 03:36:00 +0100 | [diff] [blame] | 1450 | |
| 1451 | return 0; |
Marek Vasut | bc2c90c | 2012-08-12 16:21:00 +0100 | [diff] [blame] | 1452 | } |
| 1453 | |
| 1454 | static void mxs_lradc_hw_stop(struct mxs_lradc *lradc) |
| 1455 | { |
| 1456 | int i; |
| 1457 | |
Juergen Beisert | f0b83cc | 2013-09-23 15:36:00 +0100 | [diff] [blame] | 1458 | mxs_lradc_reg_clear(lradc, mxs_lradc_irq_en_mask(lradc), LRADC_CTRL1); |
Marek Vasut | bc2c90c | 2012-08-12 16:21:00 +0100 | [diff] [blame] | 1459 | |
| 1460 | for (i = 0; i < LRADC_MAX_DELAY_CHANS; i++) |
Juergen Beisert | f0b83cc | 2013-09-23 15:36:00 +0100 | [diff] [blame] | 1461 | mxs_lradc_reg_wrt(lradc, 0, LRADC_DELAY(i)); |
Marek Vasut | bc2c90c | 2012-08-12 16:21:00 +0100 | [diff] [blame] | 1462 | } |
| 1463 | |
Marek Vasut | 5e1f9ac | 2013-01-21 20:05:00 +0000 | [diff] [blame] | 1464 | static const struct of_device_id mxs_lradc_dt_ids[] = { |
| 1465 | { .compatible = "fsl,imx23-lradc", .data = (void *)IMX23_LRADC, }, |
| 1466 | { .compatible = "fsl,imx28-lradc", .data = (void *)IMX28_LRADC, }, |
| 1467 | { /* sentinel */ } |
| 1468 | }; |
| 1469 | MODULE_DEVICE_TABLE(of, mxs_lradc_dt_ids); |
| 1470 | |
Juergen Beisert | dee0530 | 2013-09-23 15:36:00 +0100 | [diff] [blame] | 1471 | static int mxs_lradc_probe_touchscreen(struct mxs_lradc *lradc, |
| 1472 | struct device_node *lradc_node) |
| 1473 | { |
Juergen Beisert | e9c88fb | 2013-09-23 15:36:00 +0100 | [diff] [blame] | 1474 | int ret; |
| 1475 | u32 ts_wires = 0, adapt; |
| 1476 | |
| 1477 | ret = of_property_read_u32(lradc_node, "fsl,lradc-touchscreen-wires", |
| 1478 | &ts_wires); |
| 1479 | if (ret) |
| 1480 | return -ENODEV; /* touchscreen feature disabled */ |
| 1481 | |
| 1482 | switch (ts_wires) { |
| 1483 | case 4: |
| 1484 | lradc->use_touchscreen = MXS_LRADC_TOUCHSCREEN_4WIRE; |
| 1485 | break; |
| 1486 | case 5: |
| 1487 | if (lradc->soc == IMX28_LRADC) { |
| 1488 | lradc->use_touchscreen = MXS_LRADC_TOUCHSCREEN_5WIRE; |
| 1489 | break; |
| 1490 | } |
| 1491 | /* fall through an error message for i.MX23 */ |
| 1492 | default: |
| 1493 | dev_err(lradc->dev, |
| 1494 | "Unsupported number of touchscreen wires (%d)\n", |
| 1495 | ts_wires); |
| 1496 | return -EINVAL; |
| 1497 | } |
| 1498 | |
Juergen Beisert | dee0530 | 2013-09-23 15:36:00 +0100 | [diff] [blame] | 1499 | lradc->over_sample_cnt = 4; |
Juergen Beisert | e9c88fb | 2013-09-23 15:36:00 +0100 | [diff] [blame] | 1500 | ret = of_property_read_u32(lradc_node, "fsl,ave-ctrl", &adapt); |
| 1501 | if (ret == 0) |
| 1502 | lradc->over_sample_cnt = adapt; |
| 1503 | |
Juergen Beisert | dee0530 | 2013-09-23 15:36:00 +0100 | [diff] [blame] | 1504 | lradc->over_sample_delay = 2; |
Juergen Beisert | e9c88fb | 2013-09-23 15:36:00 +0100 | [diff] [blame] | 1505 | ret = of_property_read_u32(lradc_node, "fsl,ave-delay", &adapt); |
| 1506 | if (ret == 0) |
| 1507 | lradc->over_sample_delay = adapt; |
| 1508 | |
Juergen Beisert | dee0530 | 2013-09-23 15:36:00 +0100 | [diff] [blame] | 1509 | lradc->settling_delay = 10; |
Juergen Beisert | e9c88fb | 2013-09-23 15:36:00 +0100 | [diff] [blame] | 1510 | ret = of_property_read_u32(lradc_node, "fsl,settling", &adapt); |
| 1511 | if (ret == 0) |
| 1512 | lradc->settling_delay = adapt; |
Juergen Beisert | dee0530 | 2013-09-23 15:36:00 +0100 | [diff] [blame] | 1513 | |
| 1514 | return 0; |
| 1515 | } |
| 1516 | |
Bill Pemberton | 4ae1c61 | 2012-11-19 13:21:57 -0500 | [diff] [blame] | 1517 | static int mxs_lradc_probe(struct platform_device *pdev) |
Marek Vasut | bc2c90c | 2012-08-12 16:21:00 +0100 | [diff] [blame] | 1518 | { |
Marek Vasut | 5e1f9ac | 2013-01-21 20:05:00 +0000 | [diff] [blame] | 1519 | const struct of_device_id *of_id = |
| 1520 | of_match_device(mxs_lradc_dt_ids, &pdev->dev); |
| 1521 | const struct mxs_lradc_of_config *of_cfg = |
| 1522 | &mxs_lradc_of_config[(enum mxs_lradc_id)of_id->data]; |
Marek Vasut | bc2c90c | 2012-08-12 16:21:00 +0100 | [diff] [blame] | 1523 | struct device *dev = &pdev->dev; |
Marek Vasut | 06ddd35 | 2013-01-11 23:35:00 +0000 | [diff] [blame] | 1524 | struct device_node *node = dev->of_node; |
Marek Vasut | bc2c90c | 2012-08-12 16:21:00 +0100 | [diff] [blame] | 1525 | struct mxs_lradc *lradc; |
| 1526 | struct iio_dev *iio; |
| 1527 | struct resource *iores; |
Juergen Beisert | dee0530 | 2013-09-23 15:36:00 +0100 | [diff] [blame] | 1528 | int ret = 0, touch_ret; |
Hector Palacios | d5acf59 | 2013-12-23 17:48:00 +0000 | [diff] [blame] | 1529 | int i, s; |
| 1530 | unsigned int scale_uv; |
Marek Vasut | bc2c90c | 2012-08-12 16:21:00 +0100 | [diff] [blame] | 1531 | |
| 1532 | /* Allocate the IIO device. */ |
Sachin Kamat | 073c33d | 2013-07-22 12:02:00 +0100 | [diff] [blame] | 1533 | iio = devm_iio_device_alloc(dev, sizeof(*lradc)); |
Marek Vasut | bc2c90c | 2012-08-12 16:21:00 +0100 | [diff] [blame] | 1534 | if (!iio) { |
| 1535 | dev_err(dev, "Failed to allocate IIO device\n"); |
| 1536 | return -ENOMEM; |
| 1537 | } |
| 1538 | |
| 1539 | lradc = iio_priv(iio); |
Juergen Beisert | ccff529 | 2013-09-23 15:36:00 +0100 | [diff] [blame] | 1540 | lradc->soc = (enum mxs_lradc_id)of_id->data; |
Marek Vasut | bc2c90c | 2012-08-12 16:21:00 +0100 | [diff] [blame] | 1541 | |
| 1542 | /* Grab the memory area */ |
| 1543 | iores = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
| 1544 | lradc->dev = &pdev->dev; |
Thierry Reding | 97f4be60 | 2013-01-21 11:09:19 +0100 | [diff] [blame] | 1545 | lradc->base = devm_ioremap_resource(dev, iores); |
Sachin Kamat | 073c33d | 2013-07-22 12:02:00 +0100 | [diff] [blame] | 1546 | if (IS_ERR(lradc->base)) |
| 1547 | return PTR_ERR(lradc->base); |
Marek Vasut | bc2c90c | 2012-08-12 16:21:00 +0100 | [diff] [blame] | 1548 | |
Juergen Beisert | 18da755 | 2013-09-23 15:36:00 +0100 | [diff] [blame] | 1549 | lradc->clk = devm_clk_get(&pdev->dev, NULL); |
| 1550 | if (IS_ERR(lradc->clk)) { |
| 1551 | dev_err(dev, "Failed to get the delay unit clock\n"); |
| 1552 | return PTR_ERR(lradc->clk); |
| 1553 | } |
| 1554 | ret = clk_prepare_enable(lradc->clk); |
| 1555 | if (ret != 0) { |
| 1556 | dev_err(dev, "Failed to enable the delay unit clock\n"); |
| 1557 | return ret; |
| 1558 | } |
| 1559 | |
Juergen Beisert | dee0530 | 2013-09-23 15:36:00 +0100 | [diff] [blame] | 1560 | touch_ret = mxs_lradc_probe_touchscreen(lradc, node); |
Marek Vasut | 06ddd35 | 2013-01-11 23:35:00 +0000 | [diff] [blame] | 1561 | |
Marek Vasut | bc2c90c | 2012-08-12 16:21:00 +0100 | [diff] [blame] | 1562 | /* Grab all IRQ sources */ |
Marek Vasut | 5e1f9ac | 2013-01-21 20:05:00 +0000 | [diff] [blame] | 1563 | for (i = 0; i < of_cfg->irq_count; i++) { |
Marek Vasut | bc2c90c | 2012-08-12 16:21:00 +0100 | [diff] [blame] | 1564 | lradc->irq[i] = platform_get_irq(pdev, i); |
Sachin Kamat | 073c33d | 2013-07-22 12:02:00 +0100 | [diff] [blame] | 1565 | if (lradc->irq[i] < 0) |
| 1566 | return -EINVAL; |
Marek Vasut | bc2c90c | 2012-08-12 16:21:00 +0100 | [diff] [blame] | 1567 | |
| 1568 | ret = devm_request_irq(dev, lradc->irq[i], |
| 1569 | mxs_lradc_handle_irq, 0, |
Marek Vasut | 5e1f9ac | 2013-01-21 20:05:00 +0000 | [diff] [blame] | 1570 | of_cfg->irq_name[i], iio); |
Marek Vasut | bc2c90c | 2012-08-12 16:21:00 +0100 | [diff] [blame] | 1571 | if (ret) |
Sachin Kamat | 073c33d | 2013-07-22 12:02:00 +0100 | [diff] [blame] | 1572 | return ret; |
Marek Vasut | bc2c90c | 2012-08-12 16:21:00 +0100 | [diff] [blame] | 1573 | } |
| 1574 | |
Hector Palacios | f6db68a | 2013-12-23 17:48:00 +0000 | [diff] [blame] | 1575 | lradc->vref_mv = of_cfg->vref_mv; |
| 1576 | |
Marek Vasut | bc2c90c | 2012-08-12 16:21:00 +0100 | [diff] [blame] | 1577 | platform_set_drvdata(pdev, iio); |
| 1578 | |
| 1579 | init_completion(&lradc->completion); |
| 1580 | mutex_init(&lradc->lock); |
| 1581 | |
| 1582 | iio->name = pdev->name; |
| 1583 | iio->dev.parent = &pdev->dev; |
| 1584 | iio->info = &mxs_lradc_iio_info; |
| 1585 | iio->modes = INDIO_DIRECT_MODE; |
| 1586 | iio->channels = mxs_lradc_chan_spec; |
| 1587 | iio->num_channels = ARRAY_SIZE(mxs_lradc_chan_spec); |
Michał Mirosław | f4914e5 | 2013-05-04 14:19:00 +0100 | [diff] [blame] | 1588 | iio->masklength = LRADC_MAX_TOTAL_CHANS; |
Marek Vasut | bc2c90c | 2012-08-12 16:21:00 +0100 | [diff] [blame] | 1589 | |
| 1590 | ret = iio_triggered_buffer_setup(iio, &iio_pollfunc_store_time, |
| 1591 | &mxs_lradc_trigger_handler, |
| 1592 | &mxs_lradc_buffer_ops); |
| 1593 | if (ret) |
Sachin Kamat | 073c33d | 2013-07-22 12:02:00 +0100 | [diff] [blame] | 1594 | return ret; |
Marek Vasut | bc2c90c | 2012-08-12 16:21:00 +0100 | [diff] [blame] | 1595 | |
| 1596 | ret = mxs_lradc_trigger_init(iio); |
| 1597 | if (ret) |
| 1598 | goto err_trig; |
| 1599 | |
Hector Palacios | d5acf59 | 2013-12-23 17:48:00 +0000 | [diff] [blame] | 1600 | /* Populate available ADC input ranges */ |
| 1601 | for (i = 0; i < LRADC_MAX_TOTAL_CHANS; i++) { |
| 1602 | for (s = 0; s < ARRAY_SIZE(lradc->scale_avail[i]); s++) { |
| 1603 | /* |
| 1604 | * [s=0] = optional divider by two disabled (default) |
| 1605 | * [s=1] = optional divider by two enabled |
| 1606 | * |
| 1607 | * The scale is calculated by doing: |
| 1608 | * Vref >> (realbits - s) |
| 1609 | * which multiplies by two on the second component |
| 1610 | * of the array. |
| 1611 | */ |
| 1612 | scale_uv = ((u64)lradc->vref_mv[i] * 100000000) >> |
Alexandre Belloni | d4bf105 | 2014-01-13 16:02:00 +0000 | [diff] [blame] | 1613 | (LRADC_RESOLUTION - s); |
Hector Palacios | d5acf59 | 2013-12-23 17:48:00 +0000 | [diff] [blame] | 1614 | lradc->scale_avail[i][s].nano = |
| 1615 | do_div(scale_uv, 100000000) * 10; |
| 1616 | lradc->scale_avail[i][s].integer = scale_uv; |
| 1617 | } |
| 1618 | } |
| 1619 | |
Alexandre Belloni | f6e8a96 | 2013-03-28 22:04:00 +0000 | [diff] [blame] | 1620 | /* Configure the hardware. */ |
Fabio Estevam | 947123d | 2013-07-10 03:36:00 +0100 | [diff] [blame] | 1621 | ret = mxs_lradc_hw_init(lradc); |
| 1622 | if (ret) |
| 1623 | goto err_dev; |
Alexandre Belloni | f6e8a96 | 2013-03-28 22:04:00 +0000 | [diff] [blame] | 1624 | |
Marek Vasut | 06ddd35 | 2013-01-11 23:35:00 +0000 | [diff] [blame] | 1625 | /* Register the touchscreen input device. */ |
Juergen Beisert | dee0530 | 2013-09-23 15:36:00 +0100 | [diff] [blame] | 1626 | if (touch_ret == 0) { |
| 1627 | ret = mxs_lradc_ts_register(lradc); |
| 1628 | if (ret) |
| 1629 | goto err_ts_register; |
| 1630 | } |
Marek Vasut | 06ddd35 | 2013-01-11 23:35:00 +0000 | [diff] [blame] | 1631 | |
Marek Vasut | bc2c90c | 2012-08-12 16:21:00 +0100 | [diff] [blame] | 1632 | /* Register IIO device. */ |
| 1633 | ret = iio_device_register(iio); |
| 1634 | if (ret) { |
| 1635 | dev_err(dev, "Failed to register IIO device\n"); |
Marek Vasut | 06ddd35 | 2013-01-11 23:35:00 +0000 | [diff] [blame] | 1636 | goto err_ts; |
Marek Vasut | bc2c90c | 2012-08-12 16:21:00 +0100 | [diff] [blame] | 1637 | } |
| 1638 | |
Marek Vasut | bc2c90c | 2012-08-12 16:21:00 +0100 | [diff] [blame] | 1639 | return 0; |
| 1640 | |
Marek Vasut | 06ddd35 | 2013-01-11 23:35:00 +0000 | [diff] [blame] | 1641 | err_ts: |
| 1642 | mxs_lradc_ts_unregister(lradc); |
Fabio Estevam | a0ef6db | 2013-09-03 01:48:00 +0100 | [diff] [blame] | 1643 | err_ts_register: |
| 1644 | mxs_lradc_hw_stop(lradc); |
Marek Vasut | bc2c90c | 2012-08-12 16:21:00 +0100 | [diff] [blame] | 1645 | err_dev: |
| 1646 | mxs_lradc_trigger_remove(iio); |
| 1647 | err_trig: |
| 1648 | iio_triggered_buffer_cleanup(iio); |
Marek Vasut | bc2c90c | 2012-08-12 16:21:00 +0100 | [diff] [blame] | 1649 | return ret; |
| 1650 | } |
| 1651 | |
Bill Pemberton | 447d4f2 | 2012-11-19 13:26:37 -0500 | [diff] [blame] | 1652 | static int mxs_lradc_remove(struct platform_device *pdev) |
Marek Vasut | bc2c90c | 2012-08-12 16:21:00 +0100 | [diff] [blame] | 1653 | { |
| 1654 | struct iio_dev *iio = platform_get_drvdata(pdev); |
| 1655 | struct mxs_lradc *lradc = iio_priv(iio); |
| 1656 | |
Marek Vasut | bc2c90c | 2012-08-12 16:21:00 +0100 | [diff] [blame] | 1657 | iio_device_unregister(iio); |
Fabio Estevam | a0ef6db | 2013-09-03 01:48:00 +0100 | [diff] [blame] | 1658 | mxs_lradc_ts_unregister(lradc); |
| 1659 | mxs_lradc_hw_stop(lradc); |
Marek Vasut | bc2c90c | 2012-08-12 16:21:00 +0100 | [diff] [blame] | 1660 | mxs_lradc_trigger_remove(iio); |
Fabio Estevam | a0ef6db | 2013-09-03 01:48:00 +0100 | [diff] [blame] | 1661 | iio_triggered_buffer_cleanup(iio); |
Marek Vasut | bc2c90c | 2012-08-12 16:21:00 +0100 | [diff] [blame] | 1662 | |
Juergen Beisert | 18da755 | 2013-09-23 15:36:00 +0100 | [diff] [blame] | 1663 | clk_disable_unprepare(lradc->clk); |
Marek Vasut | bc2c90c | 2012-08-12 16:21:00 +0100 | [diff] [blame] | 1664 | return 0; |
| 1665 | } |
| 1666 | |
Marek Vasut | bc2c90c | 2012-08-12 16:21:00 +0100 | [diff] [blame] | 1667 | static struct platform_driver mxs_lradc_driver = { |
| 1668 | .driver = { |
| 1669 | .name = DRIVER_NAME, |
| 1670 | .owner = THIS_MODULE, |
| 1671 | .of_match_table = mxs_lradc_dt_ids, |
| 1672 | }, |
| 1673 | .probe = mxs_lradc_probe, |
Bill Pemberton | e543acf | 2012-11-19 13:21:38 -0500 | [diff] [blame] | 1674 | .remove = mxs_lradc_remove, |
Marek Vasut | bc2c90c | 2012-08-12 16:21:00 +0100 | [diff] [blame] | 1675 | }; |
| 1676 | |
| 1677 | module_platform_driver(mxs_lradc_driver); |
| 1678 | |
| 1679 | MODULE_AUTHOR("Marek Vasut <marex@denx.de>"); |
| 1680 | MODULE_DESCRIPTION("Freescale i.MX28 LRADC driver"); |
| 1681 | MODULE_LICENSE("GPL v2"); |
Fabio Estevam | 8c4a8c9 | 2013-09-03 01:48:00 +0100 | [diff] [blame] | 1682 | MODULE_ALIAS("platform:" DRIVER_NAME); |