David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 1 | /* |
| 2 | * ADS7846 based touchscreen and sensor driver |
| 3 | * |
| 4 | * Copyright (c) 2005 David Brownell |
Imre Deak | 7de90a8 | 2006-04-11 23:43:55 -0400 | [diff] [blame^] | 5 | * Copyright (c) 2006 Nokia Corporation |
| 6 | * Various changes: Imre Deak <imre.deak@nokia.com> |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 7 | * |
| 8 | * Using code from: |
| 9 | * - corgi_ts.c |
| 10 | * Copyright (C) 2004-2005 Richard Purdie |
| 11 | * - omap_ts.[hc], ads7846.h, ts_osk.c |
| 12 | * Copyright (C) 2002 MontaVista Software |
| 13 | * Copyright (C) 2004 Texas Instruments |
| 14 | * Copyright (C) 2005 Dirk Behme |
| 15 | * |
| 16 | * This program is free software; you can redistribute it and/or modify |
| 17 | * it under the terms of the GNU General Public License version 2 as |
| 18 | * published by the Free Software Foundation. |
| 19 | */ |
| 20 | #include <linux/device.h> |
| 21 | #include <linux/init.h> |
| 22 | #include <linux/delay.h> |
| 23 | #include <linux/input.h> |
| 24 | #include <linux/interrupt.h> |
| 25 | #include <linux/slab.h> |
| 26 | #include <linux/spi/spi.h> |
| 27 | #include <linux/spi/ads7846.h> |
Andrew Morton | 3ac8bf0 | 2006-03-26 01:37:33 -0800 | [diff] [blame] | 28 | #include <asm/irq.h> |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 29 | |
| 30 | #ifdef CONFIG_ARM |
| 31 | #include <asm/mach-types.h> |
| 32 | #ifdef CONFIG_ARCH_OMAP |
| 33 | #include <asm/arch/gpio.h> |
| 34 | #endif |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 35 | #endif |
| 36 | |
| 37 | |
| 38 | /* |
Imre Deak | 7de90a8 | 2006-04-11 23:43:55 -0400 | [diff] [blame^] | 39 | * This code has been tested on an ads7846 / N770 device. |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 40 | * Support for ads7843 and ads7845 has only been stubbed in. |
| 41 | * |
Imre Deak | 7de90a8 | 2006-04-11 23:43:55 -0400 | [diff] [blame^] | 42 | * Not yet done: How accurate are the temperature and voltage |
| 43 | * readings? (System-specific calibration should support |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 44 | * accuracy of 0.3 degrees C; otherwise it's 2.0 degrees.) |
| 45 | * |
Imre Deak | 7de90a8 | 2006-04-11 23:43:55 -0400 | [diff] [blame^] | 46 | * IRQ handling needs a workaround because of a shortcoming in handling |
| 47 | * edge triggered IRQs on some platforms like the OMAP1/2. These |
| 48 | * platforms don't handle the ARM lazy IRQ disabling properly, thus we |
| 49 | * have to maintain our own SW IRQ disabled status. This should be |
| 50 | * removed as soon as the affected platform's IRQ handling is fixed. |
| 51 | * |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 52 | * app note sbaa036 talks in more detail about accurate sampling... |
| 53 | * that ought to help in situations like LCDs inducing noise (which |
| 54 | * can also be helped by using synch signals) and more generally. |
Imre Deak | 7de90a8 | 2006-04-11 23:43:55 -0400 | [diff] [blame^] | 55 | * This driver tries to utilize the measures described in the app |
| 56 | * note. The strength of filtering can be set in the board-* specific |
| 57 | * files. |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 58 | */ |
| 59 | |
| 60 | #define TS_POLL_PERIOD msecs_to_jiffies(10) |
| 61 | |
David Brownell | d93f70b | 2006-02-15 00:49:35 -0500 | [diff] [blame] | 62 | /* this driver doesn't aim at the peak continuous sample rate */ |
| 63 | #define SAMPLE_BITS (8 /*cmd*/ + 16 /*sample*/ + 2 /* before, after */) |
| 64 | |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 65 | struct ts_event { |
| 66 | /* For portability, we can't read 12 bit values using SPI (which |
| 67 | * would make the controller deliver them as native byteorder u16 |
David Brownell | d93f70b | 2006-02-15 00:49:35 -0500 | [diff] [blame] | 68 | * with msbs zeroed). Instead, we read them as two 8-bit values, |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 69 | * which need byteswapping then range adjustment. |
| 70 | */ |
| 71 | __be16 x; |
| 72 | __be16 y; |
| 73 | __be16 z1, z2; |
| 74 | }; |
| 75 | |
| 76 | struct ads7846 { |
Dmitry Torokhov | a90f7e9 | 2006-02-15 00:49:22 -0500 | [diff] [blame] | 77 | struct input_dev *input; |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 78 | char phys[32]; |
| 79 | |
| 80 | struct spi_device *spi; |
| 81 | u16 model; |
| 82 | u16 vref_delay_usecs; |
| 83 | u16 x_plate_ohms; |
| 84 | |
Imre Deak | 53a0ef89 | 2006-04-11 23:41:49 -0400 | [diff] [blame] | 85 | u8 read_x, read_y, read_z1, read_z2, pwrdown; |
| 86 | u16 dummy; /* for the pwrdown read */ |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 87 | struct ts_event tc; |
| 88 | |
Imre Deak | 53a0ef89 | 2006-04-11 23:41:49 -0400 | [diff] [blame] | 89 | struct spi_transfer xfer[10]; |
Imre Deak | 0b7018a | 2006-04-11 23:42:03 -0400 | [diff] [blame] | 90 | struct spi_message msg[5]; |
| 91 | int msg_idx; |
| 92 | int read_cnt; |
| 93 | int last_read; |
| 94 | |
| 95 | u16 debounce_max; |
| 96 | u16 debounce_tol; |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 97 | |
| 98 | spinlock_t lock; |
| 99 | struct timer_list timer; /* P: lock */ |
| 100 | unsigned pendown:1; /* P: lock */ |
| 101 | unsigned pending:1; /* P: lock */ |
| 102 | // FIXME remove "irq_disabled" |
| 103 | unsigned irq_disabled:1; /* P: lock */ |
Imre Deak | 7de90a8 | 2006-04-11 23:43:55 -0400 | [diff] [blame^] | 104 | unsigned disabled:1; |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 105 | }; |
| 106 | |
| 107 | /* leave chip selected when we're done, for quicker re-select? */ |
| 108 | #if 0 |
| 109 | #define CS_CHANGE(xfer) ((xfer).cs_change = 1) |
| 110 | #else |
| 111 | #define CS_CHANGE(xfer) ((xfer).cs_change = 0) |
| 112 | #endif |
| 113 | |
| 114 | /*--------------------------------------------------------------------------*/ |
| 115 | |
| 116 | /* The ADS7846 has touchscreen and other sensors. |
| 117 | * Earlier ads784x chips are somewhat compatible. |
| 118 | */ |
| 119 | #define ADS_START (1 << 7) |
| 120 | #define ADS_A2A1A0_d_y (1 << 4) /* differential */ |
| 121 | #define ADS_A2A1A0_d_z1 (3 << 4) /* differential */ |
| 122 | #define ADS_A2A1A0_d_z2 (4 << 4) /* differential */ |
| 123 | #define ADS_A2A1A0_d_x (5 << 4) /* differential */ |
| 124 | #define ADS_A2A1A0_temp0 (0 << 4) /* non-differential */ |
| 125 | #define ADS_A2A1A0_vbatt (2 << 4) /* non-differential */ |
| 126 | #define ADS_A2A1A0_vaux (6 << 4) /* non-differential */ |
| 127 | #define ADS_A2A1A0_temp1 (7 << 4) /* non-differential */ |
| 128 | #define ADS_8_BIT (1 << 3) |
| 129 | #define ADS_12_BIT (0 << 3) |
| 130 | #define ADS_SER (1 << 2) /* non-differential */ |
| 131 | #define ADS_DFR (0 << 2) /* differential */ |
| 132 | #define ADS_PD10_PDOWN (0 << 0) /* lowpower mode + penirq */ |
| 133 | #define ADS_PD10_ADC_ON (1 << 0) /* ADC on */ |
| 134 | #define ADS_PD10_REF_ON (2 << 0) /* vREF on + penirq */ |
| 135 | #define ADS_PD10_ALL_ON (3 << 0) /* ADC + vREF on */ |
| 136 | |
| 137 | #define MAX_12BIT ((1<<12)-1) |
| 138 | |
| 139 | /* leave ADC powered up (disables penirq) between differential samples */ |
| 140 | #define READ_12BIT_DFR(x) (ADS_START | ADS_A2A1A0_d_ ## x \ |
| 141 | | ADS_12_BIT | ADS_DFR) |
| 142 | |
David Brownell | d93f70b | 2006-02-15 00:49:35 -0500 | [diff] [blame] | 143 | #define READ_Y (READ_12BIT_DFR(y) | ADS_PD10_ADC_ON) |
| 144 | #define READ_Z1 (READ_12BIT_DFR(z1) | ADS_PD10_ADC_ON) |
| 145 | #define READ_Z2 (READ_12BIT_DFR(z2) | ADS_PD10_ADC_ON) |
Imre Deak | 53a0ef89 | 2006-04-11 23:41:49 -0400 | [diff] [blame] | 146 | |
| 147 | #define READ_X (READ_12BIT_DFR(x) | ADS_PD10_ADC_ON) |
| 148 | #define PWRDOWN (READ_12BIT_DFR(y) | ADS_PD10_PDOWN) /* LAST */ |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 149 | |
| 150 | /* single-ended samples need to first power up reference voltage; |
| 151 | * we leave both ADC and VREF powered |
| 152 | */ |
| 153 | #define READ_12BIT_SER(x) (ADS_START | ADS_A2A1A0_ ## x \ |
| 154 | | ADS_12_BIT | ADS_SER) |
| 155 | |
David Brownell | d93f70b | 2006-02-15 00:49:35 -0500 | [diff] [blame] | 156 | #define REF_ON (READ_12BIT_DFR(x) | ADS_PD10_ALL_ON) |
| 157 | #define REF_OFF (READ_12BIT_DFR(y) | ADS_PD10_PDOWN) |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 158 | |
| 159 | /*--------------------------------------------------------------------------*/ |
| 160 | |
| 161 | /* |
| 162 | * Non-touchscreen sensors only use single-ended conversions. |
| 163 | */ |
| 164 | |
| 165 | struct ser_req { |
David Brownell | d93f70b | 2006-02-15 00:49:35 -0500 | [diff] [blame] | 166 | u8 ref_on; |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 167 | u8 command; |
David Brownell | d93f70b | 2006-02-15 00:49:35 -0500 | [diff] [blame] | 168 | u8 ref_off; |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 169 | u16 scratch; |
| 170 | __be16 sample; |
| 171 | struct spi_message msg; |
| 172 | struct spi_transfer xfer[6]; |
| 173 | }; |
| 174 | |
Imre Deak | 7de90a8 | 2006-04-11 23:43:55 -0400 | [diff] [blame^] | 175 | static void ads7846_enable(struct ads7846 *ts); |
| 176 | static void ads7846_disable(struct ads7846 *ts); |
| 177 | |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 178 | static int ads7846_read12_ser(struct device *dev, unsigned command) |
| 179 | { |
| 180 | struct spi_device *spi = to_spi_device(dev); |
| 181 | struct ads7846 *ts = dev_get_drvdata(dev); |
| 182 | struct ser_req *req = kzalloc(sizeof *req, SLAB_KERNEL); |
| 183 | int status; |
| 184 | int sample; |
Dmitry Torokhov | a90f7e9 | 2006-02-15 00:49:22 -0500 | [diff] [blame] | 185 | int i; |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 186 | |
| 187 | if (!req) |
| 188 | return -ENOMEM; |
| 189 | |
Imre Deak | 0b7018a | 2006-04-11 23:42:03 -0400 | [diff] [blame] | 190 | spi_message_init(&req->msg); |
Vitaly Wool | 8275c64 | 2006-01-08 13:34:28 -0800 | [diff] [blame] | 191 | |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 192 | /* activate reference, so it has time to settle; */ |
David Brownell | d93f70b | 2006-02-15 00:49:35 -0500 | [diff] [blame] | 193 | req->ref_on = REF_ON; |
| 194 | req->xfer[0].tx_buf = &req->ref_on; |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 195 | req->xfer[0].len = 1; |
| 196 | req->xfer[1].rx_buf = &req->scratch; |
| 197 | req->xfer[1].len = 2; |
| 198 | |
| 199 | /* |
| 200 | * for external VREF, 0 usec (and assume it's always on); |
| 201 | * for 1uF, use 800 usec; |
| 202 | * no cap, 100 usec. |
| 203 | */ |
| 204 | req->xfer[1].delay_usecs = ts->vref_delay_usecs; |
| 205 | |
| 206 | /* take sample */ |
| 207 | req->command = (u8) command; |
| 208 | req->xfer[2].tx_buf = &req->command; |
| 209 | req->xfer[2].len = 1; |
| 210 | req->xfer[3].rx_buf = &req->sample; |
| 211 | req->xfer[3].len = 2; |
| 212 | |
| 213 | /* REVISIT: take a few more samples, and compare ... */ |
| 214 | |
| 215 | /* turn off reference */ |
David Brownell | d93f70b | 2006-02-15 00:49:35 -0500 | [diff] [blame] | 216 | req->ref_off = REF_OFF; |
| 217 | req->xfer[4].tx_buf = &req->ref_off; |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 218 | req->xfer[4].len = 1; |
| 219 | req->xfer[5].rx_buf = &req->scratch; |
| 220 | req->xfer[5].len = 2; |
| 221 | |
| 222 | CS_CHANGE(req->xfer[5]); |
| 223 | |
| 224 | /* group all the transfers together, so we can't interfere with |
| 225 | * reading touchscreen state; disable penirq while sampling |
| 226 | */ |
Vitaly Wool | 8275c64 | 2006-01-08 13:34:28 -0800 | [diff] [blame] | 227 | for (i = 0; i < 6; i++) |
| 228 | spi_message_add_tail(&req->xfer[i], &req->msg); |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 229 | |
| 230 | disable_irq(spi->irq); |
| 231 | status = spi_sync(spi, &req->msg); |
| 232 | enable_irq(spi->irq); |
| 233 | |
| 234 | if (req->msg.status) |
| 235 | status = req->msg.status; |
| 236 | sample = be16_to_cpu(req->sample); |
| 237 | sample = sample >> 4; |
| 238 | kfree(req); |
| 239 | |
| 240 | return status ? status : sample; |
| 241 | } |
| 242 | |
| 243 | #define SHOW(name) static ssize_t \ |
| 244 | name ## _show(struct device *dev, struct device_attribute *attr, char *buf) \ |
| 245 | { \ |
| 246 | ssize_t v = ads7846_read12_ser(dev, \ |
| 247 | READ_12BIT_SER(name) | ADS_PD10_ALL_ON); \ |
| 248 | if (v < 0) \ |
| 249 | return v; \ |
| 250 | return sprintf(buf, "%u\n", (unsigned) v); \ |
| 251 | } \ |
| 252 | static DEVICE_ATTR(name, S_IRUGO, name ## _show, NULL); |
| 253 | |
| 254 | SHOW(temp0) |
| 255 | SHOW(temp1) |
| 256 | SHOW(vaux) |
| 257 | SHOW(vbatt) |
| 258 | |
Imre Deak | 438f2a7 | 2006-04-11 23:41:32 -0400 | [diff] [blame] | 259 | static int is_pen_down(struct device *dev) |
| 260 | { |
| 261 | struct ads7846 *ts = dev_get_drvdata(dev); |
| 262 | |
| 263 | return ts->pendown; |
| 264 | } |
| 265 | |
| 266 | static ssize_t ads7846_pen_down_show(struct device *dev, |
| 267 | struct device_attribute *attr, char *buf) |
| 268 | { |
| 269 | return sprintf(buf, "%u\n", is_pen_down(dev)); |
| 270 | } |
| 271 | |
| 272 | static DEVICE_ATTR(pen_down, S_IRUGO, ads7846_pen_down_show, NULL); |
| 273 | |
Imre Deak | 7de90a8 | 2006-04-11 23:43:55 -0400 | [diff] [blame^] | 274 | static ssize_t ads7846_disable_show(struct device *dev, |
| 275 | struct device_attribute *attr, char *buf) |
| 276 | { |
| 277 | struct ads7846 *ts = dev_get_drvdata(dev); |
| 278 | |
| 279 | return sprintf(buf, "%u\n", ts->disabled); |
| 280 | } |
| 281 | |
| 282 | static ssize_t ads7846_disable_store(struct device *dev, |
| 283 | struct device_attribute *attr, |
| 284 | const char *buf, size_t count) |
| 285 | { |
| 286 | struct ads7846 *ts = dev_get_drvdata(dev); |
| 287 | char *endp; |
| 288 | int i; |
| 289 | |
| 290 | i = simple_strtoul(buf, &endp, 10); |
| 291 | spin_lock_irq(&ts->lock); |
| 292 | |
| 293 | if (i) |
| 294 | ads7846_disable(ts); |
| 295 | else |
| 296 | ads7846_enable(ts); |
| 297 | |
| 298 | spin_unlock_irq(&ts->lock); |
| 299 | |
| 300 | return count; |
| 301 | } |
| 302 | |
| 303 | static DEVICE_ATTR(disable, 0664, ads7846_disable_show, ads7846_disable_store); |
| 304 | |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 305 | /*--------------------------------------------------------------------------*/ |
| 306 | |
| 307 | /* |
| 308 | * PENIRQ only kicks the timer. The timer only reissues the SPI transfer, |
| 309 | * to retrieve touchscreen status. |
| 310 | * |
| 311 | * The SPI transfer completion callback does the real work. It reports |
| 312 | * touchscreen events and reactivates the timer (or IRQ) as appropriate. |
| 313 | */ |
| 314 | |
| 315 | static void ads7846_rx(void *ads) |
| 316 | { |
Dmitry Torokhov | a90f7e9 | 2006-02-15 00:49:22 -0500 | [diff] [blame] | 317 | struct ads7846 *ts = ads; |
| 318 | struct input_dev *input_dev = ts->input; |
| 319 | unsigned Rt; |
| 320 | unsigned sync = 0; |
| 321 | u16 x, y, z1, z2; |
| 322 | unsigned long flags; |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 323 | |
| 324 | /* adjust: 12 bit samples (left aligned), built from |
| 325 | * two 8 bit values writen msb-first. |
| 326 | */ |
| 327 | x = be16_to_cpu(ts->tc.x) >> 4; |
| 328 | y = be16_to_cpu(ts->tc.y) >> 4; |
| 329 | z1 = be16_to_cpu(ts->tc.z1) >> 4; |
| 330 | z2 = be16_to_cpu(ts->tc.z2) >> 4; |
| 331 | |
| 332 | /* range filtering */ |
| 333 | if (x == MAX_12BIT) |
| 334 | x = 0; |
| 335 | |
| 336 | if (x && z1 && ts->spi->dev.power.power_state.event == PM_EVENT_ON) { |
| 337 | /* compute touch pressure resistance using equation #2 */ |
| 338 | Rt = z2; |
| 339 | Rt -= z1; |
| 340 | Rt *= x; |
| 341 | Rt *= ts->x_plate_ohms; |
| 342 | Rt /= z1; |
| 343 | Rt = (Rt + 2047) >> 12; |
| 344 | } else |
| 345 | Rt = 0; |
| 346 | |
| 347 | /* NOTE: "pendown" is inferred from pressure; we don't rely on |
| 348 | * being able to check nPENIRQ status, or "friendly" trigger modes |
| 349 | * (both-edges is much better than just-falling or low-level). |
| 350 | * |
| 351 | * REVISIT: some boards may require reading nPENIRQ; it's |
| 352 | * needed on 7843. and 7845 reads pressure differently... |
| 353 | * |
| 354 | * REVISIT: the touchscreen might not be connected; this code |
| 355 | * won't notice that, even if nPENIRQ never fires ... |
| 356 | */ |
| 357 | if (!ts->pendown && Rt != 0) { |
Dmitry Torokhov | a90f7e9 | 2006-02-15 00:49:22 -0500 | [diff] [blame] | 358 | input_report_key(input_dev, BTN_TOUCH, 1); |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 359 | sync = 1; |
| 360 | } else if (ts->pendown && Rt == 0) { |
Dmitry Torokhov | a90f7e9 | 2006-02-15 00:49:22 -0500 | [diff] [blame] | 361 | input_report_key(input_dev, BTN_TOUCH, 0); |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 362 | sync = 1; |
| 363 | } |
| 364 | |
| 365 | if (Rt) { |
Dmitry Torokhov | a90f7e9 | 2006-02-15 00:49:22 -0500 | [diff] [blame] | 366 | input_report_abs(input_dev, ABS_X, x); |
| 367 | input_report_abs(input_dev, ABS_Y, y); |
| 368 | input_report_abs(input_dev, ABS_PRESSURE, Rt); |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 369 | sync = 1; |
| 370 | } |
| 371 | if (sync) |
Dmitry Torokhov | a90f7e9 | 2006-02-15 00:49:22 -0500 | [diff] [blame] | 372 | input_sync(input_dev); |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 373 | |
| 374 | #ifdef VERBOSE |
| 375 | if (Rt || ts->pendown) |
| 376 | pr_debug("%s: %d/%d/%d%s\n", ts->spi->dev.bus_id, |
| 377 | x, y, Rt, Rt ? "" : " UP"); |
| 378 | #endif |
| 379 | |
| 380 | /* don't retrigger while we're suspended */ |
| 381 | spin_lock_irqsave(&ts->lock, flags); |
| 382 | |
| 383 | ts->pendown = (Rt != 0); |
| 384 | ts->pending = 0; |
| 385 | |
| 386 | if (ts->spi->dev.power.power_state.event == PM_EVENT_ON) { |
| 387 | if (ts->pendown) |
| 388 | mod_timer(&ts->timer, jiffies + TS_POLL_PERIOD); |
| 389 | else if (ts->irq_disabled) { |
| 390 | ts->irq_disabled = 0; |
| 391 | enable_irq(ts->spi->irq); |
| 392 | } |
| 393 | } |
| 394 | |
| 395 | spin_unlock_irqrestore(&ts->lock, flags); |
| 396 | } |
| 397 | |
Imre Deak | 0b7018a | 2006-04-11 23:42:03 -0400 | [diff] [blame] | 398 | static void ads7846_debounce(void *ads) |
| 399 | { |
| 400 | struct ads7846 *ts = ads; |
| 401 | struct spi_message *m; |
| 402 | struct spi_transfer *t; |
| 403 | u16 val; |
| 404 | int status; |
| 405 | |
| 406 | m = &ts->msg[ts->msg_idx]; |
| 407 | t = list_entry(m->transfers.prev, struct spi_transfer, transfer_list); |
| 408 | val = (*(u16 *)t->rx_buf) >> 3; |
| 409 | |
| 410 | if (!ts->read_cnt || (abs(ts->last_read - val) > ts->debounce_tol |
| 411 | && ts->read_cnt < ts->debounce_max)) { |
| 412 | /* Repeat it, if this was the first read or the read wasn't |
| 413 | * consistent enough |
| 414 | */ |
| 415 | ts->read_cnt++; |
| 416 | ts->last_read = val; |
| 417 | } else { |
| 418 | /* Go for the next read */ |
| 419 | ts->msg_idx++; |
| 420 | ts->read_cnt = 0; |
| 421 | m++; |
| 422 | } |
| 423 | status = spi_async(ts->spi, m); |
| 424 | if (status) |
| 425 | dev_err(&ts->spi->dev, "spi_async --> %d\n", |
| 426 | status); |
| 427 | } |
| 428 | |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 429 | static void ads7846_timer(unsigned long handle) |
| 430 | { |
| 431 | struct ads7846 *ts = (void *)handle; |
| 432 | int status = 0; |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 433 | |
Imre Deak | 0b7018a | 2006-04-11 23:42:03 -0400 | [diff] [blame] | 434 | ts->msg_idx = 0; |
| 435 | status = spi_async(ts->spi, &ts->msg[0]); |
| 436 | if (status) |
| 437 | dev_err(&ts->spi->dev, "spi_async --> %d\n", status); |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 438 | } |
| 439 | |
| 440 | static irqreturn_t ads7846_irq(int irq, void *handle, struct pt_regs *regs) |
| 441 | { |
Imre Deak | 0b7018a | 2006-04-11 23:42:03 -0400 | [diff] [blame] | 442 | struct ads7846 *ts = handle; |
| 443 | unsigned long flags; |
Imre Deak | 0b7018a | 2006-04-11 23:42:03 -0400 | [diff] [blame] | 444 | |
| 445 | spin_lock_irqsave(&ts->lock, flags); |
Imre Deak | 7de90a8 | 2006-04-11 23:43:55 -0400 | [diff] [blame^] | 446 | if (likely(!ts->irq_disabled && !ts->disabled)) { |
Imre Deak | 0b7018a | 2006-04-11 23:42:03 -0400 | [diff] [blame] | 447 | if (!ts->irq_disabled) { |
| 448 | /* REVISIT irq logic for many ARM chips has cloned a |
| 449 | * bug wherein disabling an irq in its handler won't |
| 450 | * work;(it's disabled lazily, and too late to work. |
| 451 | * until all their irq logic is fixed, we must shadow |
| 452 | * that state here. |
| 453 | */ |
| 454 | ts->irq_disabled = 1; |
| 455 | |
| 456 | disable_irq(ts->spi->irq); |
| 457 | } |
| 458 | if (!ts->pending) { |
| 459 | ts->pending = 1; |
| 460 | mod_timer(&ts->timer, jiffies); |
| 461 | } |
| 462 | } |
| 463 | spin_unlock_irqrestore(&ts->lock, flags); |
Imre Deak | 7de90a8 | 2006-04-11 23:43:55 -0400 | [diff] [blame^] | 464 | |
| 465 | return IRQ_HANDLED; |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 466 | } |
| 467 | |
| 468 | /*--------------------------------------------------------------------------*/ |
| 469 | |
Imre Deak | 7de90a8 | 2006-04-11 23:43:55 -0400 | [diff] [blame^] | 470 | /* Must be called with ts->lock held */ |
| 471 | static void ads7846_disable(struct ads7846 *ts) |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 472 | { |
Imre Deak | 7de90a8 | 2006-04-11 23:43:55 -0400 | [diff] [blame^] | 473 | if (ts->disabled) |
| 474 | return; |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 475 | |
| 476 | /* are we waiting for IRQ, or polling? */ |
| 477 | if (!ts->pendown) { |
| 478 | if (!ts->irq_disabled) { |
| 479 | ts->irq_disabled = 1; |
| 480 | disable_irq(ts->spi->irq); |
| 481 | } |
| 482 | } else { |
| 483 | /* polling; force a final SPI completion; |
| 484 | * that will clean things up neatly |
| 485 | */ |
| 486 | if (!ts->pending) |
| 487 | mod_timer(&ts->timer, jiffies); |
| 488 | |
| 489 | while (ts->pendown || ts->pending) { |
Imre Deak | 7de90a8 | 2006-04-11 23:43:55 -0400 | [diff] [blame^] | 490 | spin_unlock_irq(&ts->lock); |
Juha Yrjola | c4febb9 | 2006-04-11 23:42:25 -0400 | [diff] [blame] | 491 | msleep(1); |
Imre Deak | 7de90a8 | 2006-04-11 23:43:55 -0400 | [diff] [blame^] | 492 | spin_lock_irq(&ts->lock); |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 493 | } |
| 494 | } |
| 495 | |
| 496 | /* we know the chip's in lowpower mode since we always |
| 497 | * leave it that way after every request |
| 498 | */ |
| 499 | |
Imre Deak | 7de90a8 | 2006-04-11 23:43:55 -0400 | [diff] [blame^] | 500 | ts->disabled = 1; |
| 501 | } |
| 502 | |
| 503 | /* Must be called with ts->lock held */ |
| 504 | static void ads7846_enable(struct ads7846 *ts) |
| 505 | { |
| 506 | if (!ts->disabled) |
| 507 | return; |
| 508 | |
| 509 | ts->disabled = 0; |
| 510 | ts->irq_disabled = 0; |
| 511 | enable_irq(ts->spi->irq); |
| 512 | } |
| 513 | |
| 514 | static int ads7846_suspend(struct spi_device *spi, pm_message_t message) |
| 515 | { |
| 516 | struct ads7846 *ts = dev_get_drvdata(&spi->dev); |
| 517 | |
| 518 | spin_lock_irq(&ts->lock); |
| 519 | |
| 520 | spi->dev.power.power_state = message; |
| 521 | ads7846_disable(ts); |
| 522 | |
| 523 | spin_unlock_irq(&ts->lock); |
| 524 | |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 525 | return 0; |
Imre Deak | 7de90a8 | 2006-04-11 23:43:55 -0400 | [diff] [blame^] | 526 | |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 527 | } |
| 528 | |
David Brownell | 2e5a7bd | 2006-01-08 13:34:25 -0800 | [diff] [blame] | 529 | static int ads7846_resume(struct spi_device *spi) |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 530 | { |
David Brownell | 2e5a7bd | 2006-01-08 13:34:25 -0800 | [diff] [blame] | 531 | struct ads7846 *ts = dev_get_drvdata(&spi->dev); |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 532 | |
Imre Deak | 7de90a8 | 2006-04-11 23:43:55 -0400 | [diff] [blame^] | 533 | spin_lock_irq(&ts->lock); |
| 534 | |
David Brownell | 2e5a7bd | 2006-01-08 13:34:25 -0800 | [diff] [blame] | 535 | spi->dev.power.power_state = PMSG_ON; |
Imre Deak | 7de90a8 | 2006-04-11 23:43:55 -0400 | [diff] [blame^] | 536 | ads7846_enable(ts); |
| 537 | |
| 538 | spin_unlock_irq(&ts->lock); |
| 539 | |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 540 | return 0; |
| 541 | } |
| 542 | |
David Brownell | 2e5a7bd | 2006-01-08 13:34:25 -0800 | [diff] [blame] | 543 | static int __devinit ads7846_probe(struct spi_device *spi) |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 544 | { |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 545 | struct ads7846 *ts; |
Dmitry Torokhov | a90f7e9 | 2006-02-15 00:49:22 -0500 | [diff] [blame] | 546 | struct input_dev *input_dev; |
David Brownell | 2e5a7bd | 2006-01-08 13:34:25 -0800 | [diff] [blame] | 547 | struct ads7846_platform_data *pdata = spi->dev.platform_data; |
Imre Deak | 0b7018a | 2006-04-11 23:42:03 -0400 | [diff] [blame] | 548 | struct spi_message *m; |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 549 | struct spi_transfer *x; |
Dmitry Torokhov | a90f7e9 | 2006-02-15 00:49:22 -0500 | [diff] [blame] | 550 | int err; |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 551 | |
| 552 | if (!spi->irq) { |
David Brownell | 2e5a7bd | 2006-01-08 13:34:25 -0800 | [diff] [blame] | 553 | dev_dbg(&spi->dev, "no IRQ?\n"); |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 554 | return -ENODEV; |
| 555 | } |
| 556 | |
| 557 | if (!pdata) { |
David Brownell | 2e5a7bd | 2006-01-08 13:34:25 -0800 | [diff] [blame] | 558 | dev_dbg(&spi->dev, "no platform data?\n"); |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 559 | return -ENODEV; |
| 560 | } |
| 561 | |
| 562 | /* don't exceed max specified sample rate */ |
David Brownell | d93f70b | 2006-02-15 00:49:35 -0500 | [diff] [blame] | 563 | if (spi->max_speed_hz > (125000 * SAMPLE_BITS)) { |
David Brownell | 2e5a7bd | 2006-01-08 13:34:25 -0800 | [diff] [blame] | 564 | dev_dbg(&spi->dev, "f(sample) %d KHz?\n", |
David Brownell | d93f70b | 2006-02-15 00:49:35 -0500 | [diff] [blame] | 565 | (spi->max_speed_hz/SAMPLE_BITS)/1000); |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 566 | return -EINVAL; |
| 567 | } |
| 568 | |
| 569 | /* We'd set the wordsize to 12 bits ... except that some controllers |
| 570 | * will then treat the 8 bit command words as 12 bits (and drop the |
| 571 | * four MSBs of the 12 bit result). Result: inputs must be shifted |
| 572 | * to discard the four garbage LSBs. |
| 573 | */ |
| 574 | |
Dmitry Torokhov | a90f7e9 | 2006-02-15 00:49:22 -0500 | [diff] [blame] | 575 | ts = kzalloc(sizeof(struct ads7846), GFP_KERNEL); |
| 576 | input_dev = input_allocate_device(); |
| 577 | if (!ts || !input_dev) { |
| 578 | err = -ENOMEM; |
| 579 | goto err_free_mem; |
| 580 | } |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 581 | |
David Brownell | 2e5a7bd | 2006-01-08 13:34:25 -0800 | [diff] [blame] | 582 | dev_set_drvdata(&spi->dev, ts); |
Dmitry Torokhov | a90f7e9 | 2006-02-15 00:49:22 -0500 | [diff] [blame] | 583 | spi->dev.power.power_state = PMSG_ON; |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 584 | |
| 585 | ts->spi = spi; |
Dmitry Torokhov | a90f7e9 | 2006-02-15 00:49:22 -0500 | [diff] [blame] | 586 | ts->input = input_dev; |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 587 | |
| 588 | init_timer(&ts->timer); |
| 589 | ts->timer.data = (unsigned long) ts; |
| 590 | ts->timer.function = ads7846_timer; |
| 591 | |
Imre Deak | 7de90a8 | 2006-04-11 23:43:55 -0400 | [diff] [blame^] | 592 | spin_lock_init(&ts->lock); |
| 593 | |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 594 | ts->model = pdata->model ? : 7846; |
| 595 | ts->vref_delay_usecs = pdata->vref_delay_usecs ? : 100; |
| 596 | ts->x_plate_ohms = pdata->x_plate_ohms ? : 400; |
Imre Deak | 0b7018a | 2006-04-11 23:42:03 -0400 | [diff] [blame] | 597 | ts->debounce_max = pdata->debounce_max ? : 1; |
| 598 | ts->debounce_tol = pdata->debounce_tol ? : 10; |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 599 | |
Dmitry Torokhov | a90f7e9 | 2006-02-15 00:49:22 -0500 | [diff] [blame] | 600 | snprintf(ts->phys, sizeof(ts->phys), "%s/input0", spi->dev.bus_id); |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 601 | |
Dmitry Torokhov | a90f7e9 | 2006-02-15 00:49:22 -0500 | [diff] [blame] | 602 | input_dev->name = "ADS784x Touchscreen"; |
| 603 | input_dev->phys = ts->phys; |
| 604 | input_dev->cdev.dev = &spi->dev; |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 605 | |
Dmitry Torokhov | a90f7e9 | 2006-02-15 00:49:22 -0500 | [diff] [blame] | 606 | input_dev->evbit[0] = BIT(EV_KEY) | BIT(EV_ABS); |
| 607 | input_dev->keybit[LONG(BTN_TOUCH)] = BIT(BTN_TOUCH); |
| 608 | input_set_abs_params(input_dev, ABS_X, |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 609 | pdata->x_min ? : 0, |
| 610 | pdata->x_max ? : MAX_12BIT, |
| 611 | 0, 0); |
Dmitry Torokhov | a90f7e9 | 2006-02-15 00:49:22 -0500 | [diff] [blame] | 612 | input_set_abs_params(input_dev, ABS_Y, |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 613 | pdata->y_min ? : 0, |
| 614 | pdata->y_max ? : MAX_12BIT, |
| 615 | 0, 0); |
Dmitry Torokhov | a90f7e9 | 2006-02-15 00:49:22 -0500 | [diff] [blame] | 616 | input_set_abs_params(input_dev, ABS_PRESSURE, |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 617 | pdata->pressure_min, pdata->pressure_max, 0, 0); |
| 618 | |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 619 | /* set up the transfers to read touchscreen state; this assumes we |
| 620 | * use formula #2 for pressure, not #3. |
| 621 | */ |
Imre Deak | 0b7018a | 2006-04-11 23:42:03 -0400 | [diff] [blame] | 622 | m = &ts->msg[0]; |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 623 | x = ts->xfer; |
| 624 | |
Imre Deak | 0b7018a | 2006-04-11 23:42:03 -0400 | [diff] [blame] | 625 | spi_message_init(m); |
| 626 | |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 627 | /* y- still on; turn on only y+ (and ADC) */ |
David Brownell | d93f70b | 2006-02-15 00:49:35 -0500 | [diff] [blame] | 628 | ts->read_y = READ_Y; |
| 629 | x->tx_buf = &ts->read_y; |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 630 | x->len = 1; |
Imre Deak | 0b7018a | 2006-04-11 23:42:03 -0400 | [diff] [blame] | 631 | spi_message_add_tail(x, m); |
David Brownell | d93f70b | 2006-02-15 00:49:35 -0500 | [diff] [blame] | 632 | |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 633 | x++; |
| 634 | x->rx_buf = &ts->tc.y; |
| 635 | x->len = 2; |
Imre Deak | 0b7018a | 2006-04-11 23:42:03 -0400 | [diff] [blame] | 636 | spi_message_add_tail(x, m); |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 637 | |
Imre Deak | 0b7018a | 2006-04-11 23:42:03 -0400 | [diff] [blame] | 638 | m->complete = ads7846_debounce; |
| 639 | m->context = ts; |
David Brownell | d93f70b | 2006-02-15 00:49:35 -0500 | [diff] [blame] | 640 | |
Imre Deak | 0b7018a | 2006-04-11 23:42:03 -0400 | [diff] [blame] | 641 | m++; |
| 642 | spi_message_init(m); |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 643 | |
| 644 | /* turn y- off, x+ on, then leave in lowpower */ |
David Brownell | d93f70b | 2006-02-15 00:49:35 -0500 | [diff] [blame] | 645 | x++; |
| 646 | ts->read_x = READ_X; |
| 647 | x->tx_buf = &ts->read_x; |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 648 | x->len = 1; |
Imre Deak | 0b7018a | 2006-04-11 23:42:03 -0400 | [diff] [blame] | 649 | spi_message_add_tail(x, m); |
David Brownell | d93f70b | 2006-02-15 00:49:35 -0500 | [diff] [blame] | 650 | |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 651 | x++; |
| 652 | x->rx_buf = &ts->tc.x; |
| 653 | x->len = 2; |
Imre Deak | 0b7018a | 2006-04-11 23:42:03 -0400 | [diff] [blame] | 654 | spi_message_add_tail(x, m); |
| 655 | |
| 656 | m->complete = ads7846_debounce; |
| 657 | m->context = ts; |
| 658 | |
| 659 | /* turn y+ off, x- on; we'll use formula #2 */ |
| 660 | if (ts->model == 7846) { |
| 661 | m++; |
| 662 | spi_message_init(m); |
| 663 | |
| 664 | x++; |
| 665 | ts->read_z1 = READ_Z1; |
| 666 | x->tx_buf = &ts->read_z1; |
| 667 | x->len = 1; |
| 668 | spi_message_add_tail(x, m); |
| 669 | |
| 670 | x++; |
| 671 | x->rx_buf = &ts->tc.z1; |
| 672 | x->len = 2; |
| 673 | spi_message_add_tail(x, m); |
| 674 | |
| 675 | m->complete = ads7846_debounce; |
| 676 | m->context = ts; |
| 677 | |
| 678 | m++; |
| 679 | spi_message_init(m); |
| 680 | |
| 681 | x++; |
| 682 | ts->read_z2 = READ_Z2; |
| 683 | x->tx_buf = &ts->read_z2; |
| 684 | x->len = 1; |
| 685 | spi_message_add_tail(x, m); |
| 686 | |
| 687 | x++; |
| 688 | x->rx_buf = &ts->tc.z2; |
| 689 | x->len = 2; |
| 690 | spi_message_add_tail(x, m); |
| 691 | |
| 692 | m->complete = ads7846_debounce; |
| 693 | m->context = ts; |
| 694 | } |
Imre Deak | 53a0ef89 | 2006-04-11 23:41:49 -0400 | [diff] [blame] | 695 | |
| 696 | /* power down */ |
Imre Deak | 0b7018a | 2006-04-11 23:42:03 -0400 | [diff] [blame] | 697 | m++; |
| 698 | spi_message_init(m); |
| 699 | |
Imre Deak | 53a0ef89 | 2006-04-11 23:41:49 -0400 | [diff] [blame] | 700 | x++; |
| 701 | ts->pwrdown = PWRDOWN; |
| 702 | x->tx_buf = &ts->pwrdown; |
| 703 | x->len = 1; |
Imre Deak | 0b7018a | 2006-04-11 23:42:03 -0400 | [diff] [blame] | 704 | spi_message_add_tail(x, m); |
Imre Deak | 53a0ef89 | 2006-04-11 23:41:49 -0400 | [diff] [blame] | 705 | |
| 706 | x++; |
| 707 | x->rx_buf = &ts->dummy; |
| 708 | x->len = 2; |
David Brownell | d93f70b | 2006-02-15 00:49:35 -0500 | [diff] [blame] | 709 | CS_CHANGE(*x); |
Imre Deak | 0b7018a | 2006-04-11 23:42:03 -0400 | [diff] [blame] | 710 | spi_message_add_tail(x, m); |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 711 | |
Imre Deak | 0b7018a | 2006-04-11 23:42:03 -0400 | [diff] [blame] | 712 | m->complete = ads7846_rx; |
| 713 | m->context = ts; |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 714 | |
Russell King | f43aaba | 2006-01-19 12:26:57 +0000 | [diff] [blame] | 715 | if (request_irq(spi->irq, ads7846_irq, |
| 716 | SA_SAMPLE_RANDOM | SA_TRIGGER_FALLING, |
| 717 | spi->dev.bus_id, ts)) { |
David Brownell | 2e5a7bd | 2006-01-08 13:34:25 -0800 | [diff] [blame] | 718 | dev_dbg(&spi->dev, "irq %d busy?\n", spi->irq); |
Dmitry Torokhov | a90f7e9 | 2006-02-15 00:49:22 -0500 | [diff] [blame] | 719 | err = -EBUSY; |
| 720 | goto err_free_mem; |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 721 | } |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 722 | |
David Brownell | 2e5a7bd | 2006-01-08 13:34:25 -0800 | [diff] [blame] | 723 | dev_info(&spi->dev, "touchscreen, irq %d\n", spi->irq); |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 724 | |
| 725 | /* take a first sample, leaving nPENIRQ active; avoid |
| 726 | * the touchscreen, in case it's not connected. |
| 727 | */ |
David Brownell | 2e5a7bd | 2006-01-08 13:34:25 -0800 | [diff] [blame] | 728 | (void) ads7846_read12_ser(&spi->dev, |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 729 | READ_12BIT_SER(vaux) | ADS_PD10_ALL_ON); |
| 730 | |
| 731 | /* ads7843/7845 don't have temperature sensors, and |
| 732 | * use the other sensors a bit differently too |
| 733 | */ |
| 734 | if (ts->model == 7846) { |
David Brownell | 2e5a7bd | 2006-01-08 13:34:25 -0800 | [diff] [blame] | 735 | device_create_file(&spi->dev, &dev_attr_temp0); |
| 736 | device_create_file(&spi->dev, &dev_attr_temp1); |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 737 | } |
| 738 | if (ts->model != 7845) |
David Brownell | 2e5a7bd | 2006-01-08 13:34:25 -0800 | [diff] [blame] | 739 | device_create_file(&spi->dev, &dev_attr_vbatt); |
| 740 | device_create_file(&spi->dev, &dev_attr_vaux); |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 741 | |
Imre Deak | 438f2a7 | 2006-04-11 23:41:32 -0400 | [diff] [blame] | 742 | device_create_file(&spi->dev, &dev_attr_pen_down); |
| 743 | |
Imre Deak | 7de90a8 | 2006-04-11 23:43:55 -0400 | [diff] [blame^] | 744 | device_create_file(&spi->dev, &dev_attr_disable); |
| 745 | |
Dmitry Torokhov | a90f7e9 | 2006-02-15 00:49:22 -0500 | [diff] [blame] | 746 | err = input_register_device(input_dev); |
| 747 | if (err) |
Imre Deak | 7de90a8 | 2006-04-11 23:43:55 -0400 | [diff] [blame^] | 748 | goto err_remove_attr; |
Dmitry Torokhov | a90f7e9 | 2006-02-15 00:49:22 -0500 | [diff] [blame] | 749 | |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 750 | return 0; |
Dmitry Torokhov | a90f7e9 | 2006-02-15 00:49:22 -0500 | [diff] [blame] | 751 | |
Imre Deak | 7de90a8 | 2006-04-11 23:43:55 -0400 | [diff] [blame^] | 752 | err_remove_attr: |
| 753 | device_remove_file(&spi->dev, &dev_attr_disable); |
| 754 | device_remove_file(&spi->dev, &dev_attr_pen_down); |
| 755 | if (ts->model == 7846) { |
| 756 | device_remove_file(&spi->dev, &dev_attr_temp1); |
| 757 | device_remove_file(&spi->dev, &dev_attr_temp0); |
| 758 | } |
| 759 | if (ts->model != 7845) |
| 760 | device_remove_file(&spi->dev, &dev_attr_vbatt); |
| 761 | device_remove_file(&spi->dev, &dev_attr_vaux); |
| 762 | |
Dmitry Torokhov | a90f7e9 | 2006-02-15 00:49:22 -0500 | [diff] [blame] | 763 | free_irq(spi->irq, ts); |
| 764 | err_free_mem: |
| 765 | input_free_device(input_dev); |
| 766 | kfree(ts); |
| 767 | return err; |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 768 | } |
| 769 | |
David Brownell | 2e5a7bd | 2006-01-08 13:34:25 -0800 | [diff] [blame] | 770 | static int __devexit ads7846_remove(struct spi_device *spi) |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 771 | { |
David Brownell | 2e5a7bd | 2006-01-08 13:34:25 -0800 | [diff] [blame] | 772 | struct ads7846 *ts = dev_get_drvdata(&spi->dev); |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 773 | |
Imre Deak | 7de90a8 | 2006-04-11 23:43:55 -0400 | [diff] [blame^] | 774 | input_unregister_device(ts->input); |
| 775 | |
David Brownell | 2e5a7bd | 2006-01-08 13:34:25 -0800 | [diff] [blame] | 776 | ads7846_suspend(spi, PMSG_SUSPEND); |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 777 | |
Imre Deak | 7de90a8 | 2006-04-11 23:43:55 -0400 | [diff] [blame^] | 778 | device_remove_file(&spi->dev, &dev_attr_disable); |
Imre Deak | 438f2a7 | 2006-04-11 23:41:32 -0400 | [diff] [blame] | 779 | device_remove_file(&spi->dev, &dev_attr_pen_down); |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 780 | if (ts->model == 7846) { |
David Brownell | 2e5a7bd | 2006-01-08 13:34:25 -0800 | [diff] [blame] | 781 | device_remove_file(&spi->dev, &dev_attr_temp1); |
Imre Deak | 7de90a8 | 2006-04-11 23:43:55 -0400 | [diff] [blame^] | 782 | device_remove_file(&spi->dev, &dev_attr_temp0); |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 783 | } |
| 784 | if (ts->model != 7845) |
David Brownell | 2e5a7bd | 2006-01-08 13:34:25 -0800 | [diff] [blame] | 785 | device_remove_file(&spi->dev, &dev_attr_vbatt); |
| 786 | device_remove_file(&spi->dev, &dev_attr_vaux); |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 787 | |
Imre Deak | 7de90a8 | 2006-04-11 23:43:55 -0400 | [diff] [blame^] | 788 | free_irq(ts->spi->irq, ts); |
| 789 | if (ts->irq_disabled) |
| 790 | enable_irq(ts->spi->irq); |
| 791 | |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 792 | kfree(ts); |
| 793 | |
David Brownell | 2e5a7bd | 2006-01-08 13:34:25 -0800 | [diff] [blame] | 794 | dev_dbg(&spi->dev, "unregistered touchscreen\n"); |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 795 | return 0; |
| 796 | } |
| 797 | |
David Brownell | 2e5a7bd | 2006-01-08 13:34:25 -0800 | [diff] [blame] | 798 | static struct spi_driver ads7846_driver = { |
| 799 | .driver = { |
| 800 | .name = "ads7846", |
| 801 | .bus = &spi_bus_type, |
| 802 | .owner = THIS_MODULE, |
| 803 | }, |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 804 | .probe = ads7846_probe, |
David Brownell | 2e5a7bd | 2006-01-08 13:34:25 -0800 | [diff] [blame] | 805 | .remove = __devexit_p(ads7846_remove), |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 806 | .suspend = ads7846_suspend, |
| 807 | .resume = ads7846_resume, |
| 808 | }; |
| 809 | |
| 810 | static int __init ads7846_init(void) |
| 811 | { |
| 812 | /* grr, board-specific init should stay out of drivers!! */ |
| 813 | |
| 814 | #ifdef CONFIG_ARCH_OMAP |
| 815 | if (machine_is_omap_osk()) { |
| 816 | /* GPIO4 = PENIRQ; GPIO6 = BUSY */ |
| 817 | omap_request_gpio(4); |
| 818 | omap_set_gpio_direction(4, 1); |
| 819 | omap_request_gpio(6); |
| 820 | omap_set_gpio_direction(6, 1); |
| 821 | } |
| 822 | // also TI 1510 Innovator, bitbanging through FPGA |
| 823 | // also Nokia 770 |
| 824 | // also Palm Tungsten T2 |
| 825 | #endif |
| 826 | |
| 827 | // PXA: |
| 828 | // also Dell Axim X50 |
| 829 | // also HP iPaq H191x/H192x/H415x/H435x |
David Brownell | 2e5a7bd | 2006-01-08 13:34:25 -0800 | [diff] [blame] | 830 | // also Intel Lubbock (additional to UCB1400; as temperature sensor) |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 831 | // also Sharp Zaurus C7xx, C8xx (corgi/sheperd/husky) |
| 832 | |
David Brownell | 2e5a7bd | 2006-01-08 13:34:25 -0800 | [diff] [blame] | 833 | // Atmel at91sam9261-EK uses ads7843 |
| 834 | |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 835 | // also various AMD Au1x00 devel boards |
| 836 | |
David Brownell | 2e5a7bd | 2006-01-08 13:34:25 -0800 | [diff] [blame] | 837 | return spi_register_driver(&ads7846_driver); |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 838 | } |
| 839 | module_init(ads7846_init); |
| 840 | |
| 841 | static void __exit ads7846_exit(void) |
| 842 | { |
David Brownell | 2e5a7bd | 2006-01-08 13:34:25 -0800 | [diff] [blame] | 843 | spi_unregister_driver(&ads7846_driver); |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 844 | |
| 845 | #ifdef CONFIG_ARCH_OMAP |
| 846 | if (machine_is_omap_osk()) { |
| 847 | omap_free_gpio(4); |
| 848 | omap_free_gpio(6); |
| 849 | } |
| 850 | #endif |
| 851 | |
| 852 | } |
| 853 | module_exit(ads7846_exit); |
| 854 | |
| 855 | MODULE_DESCRIPTION("ADS7846 TouchScreen Driver"); |
| 856 | MODULE_LICENSE("GPL"); |