Rachna Patil | 1b8be32 | 2012-03-04 08:11:57 -0800 | [diff] [blame] | 1 | /* |
| 2 | * TI Touch Screen driver |
| 3 | * |
| 4 | * Copyright (C) 2011 Texas Instruments Incorporated - http://www.ti.com/ |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or |
| 7 | * modify it under the terms of the GNU General Public License as |
| 8 | * published by the Free Software Foundation version 2. |
| 9 | * |
| 10 | * This program is distributed "as is" WITHOUT ANY WARRANTY of any |
| 11 | * kind, whether express or implied; without even the implied warranty |
| 12 | * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 13 | * GNU General Public License for more details. |
| 14 | */ |
| 15 | |
| 16 | |
Rachna Patil | 1b8be32 | 2012-03-04 08:11:57 -0800 | [diff] [blame] | 17 | #include <linux/kernel.h> |
| 18 | #include <linux/err.h> |
| 19 | #include <linux/module.h> |
| 20 | #include <linux/input.h> |
| 21 | #include <linux/slab.h> |
| 22 | #include <linux/interrupt.h> |
| 23 | #include <linux/clk.h> |
| 24 | #include <linux/platform_device.h> |
| 25 | #include <linux/io.h> |
Rachna Patil | 1b8be32 | 2012-03-04 08:11:57 -0800 | [diff] [blame] | 26 | #include <linux/delay.h> |
Patil, Rachna | 0396310 | 2013-01-24 03:45:10 +0000 | [diff] [blame] | 27 | #include <linux/of.h> |
| 28 | #include <linux/of_device.h> |
Vignesh R | 83edfdf | 2015-02-03 11:47:05 -0800 | [diff] [blame] | 29 | #include <linux/sort.h> |
Rachna Patil | 1b8be32 | 2012-03-04 08:11:57 -0800 | [diff] [blame] | 30 | |
Patil, Rachna | 2b99baf | 2012-10-16 12:55:44 +0530 | [diff] [blame] | 31 | #include <linux/mfd/ti_am335x_tscadc.h> |
Patil, Rachna | 33f5cc6 | 2012-10-16 12:55:38 +0530 | [diff] [blame] | 32 | |
| 33 | #define ADCFSM_STEPID 0x10 |
Rachna Patil | 1b8be32 | 2012-03-04 08:11:57 -0800 | [diff] [blame] | 34 | #define SEQ_SETTLE 275 |
Rachna Patil | 1b8be32 | 2012-03-04 08:11:57 -0800 | [diff] [blame] | 35 | #define MAX_12BIT ((1 << 12) - 1) |
Rachna Patil | 1b8be32 | 2012-03-04 08:11:57 -0800 | [diff] [blame] | 36 | |
Patil, Rachna | bb76dc0 | 2013-01-24 03:45:06 +0000 | [diff] [blame] | 37 | static const int config_pins[] = { |
| 38 | STEPCONFIG_XPP, |
| 39 | STEPCONFIG_XNN, |
| 40 | STEPCONFIG_YPP, |
| 41 | STEPCONFIG_YNN, |
| 42 | }; |
| 43 | |
Patil, Rachna | 55c04de | 2012-10-16 12:55:42 +0530 | [diff] [blame] | 44 | struct titsc { |
Rachna Patil | 1b8be32 | 2012-03-04 08:11:57 -0800 | [diff] [blame] | 45 | struct input_dev *input; |
Patil, Rachna | 2b99baf | 2012-10-16 12:55:44 +0530 | [diff] [blame] | 46 | struct ti_tscadc_dev *mfd_tscadc; |
Rachna Patil | 1b8be32 | 2012-03-04 08:11:57 -0800 | [diff] [blame] | 47 | unsigned int irq; |
| 48 | unsigned int wires; |
| 49 | unsigned int x_plate_resistance; |
| 50 | bool pen_down; |
Patil, Rachna | 0396310 | 2013-01-24 03:45:10 +0000 | [diff] [blame] | 51 | int coordinate_readouts; |
Patil, Rachna | bb76dc0 | 2013-01-24 03:45:06 +0000 | [diff] [blame] | 52 | u32 config_inp[4]; |
| 53 | u32 bit_xp, bit_xn, bit_yp, bit_yn; |
| 54 | u32 inp_xp, inp_xn, inp_yp, inp_yn; |
Zubair Lutfullah | baee539 | 2013-09-19 07:24:00 +0100 | [diff] [blame] | 55 | u32 step_mask; |
Vignesh R | bf22361 | 2015-02-03 11:45:34 -0800 | [diff] [blame] | 56 | u32 charge_delay; |
Rachna Patil | 1b8be32 | 2012-03-04 08:11:57 -0800 | [diff] [blame] | 57 | }; |
| 58 | |
Patil, Rachna | 55c04de | 2012-10-16 12:55:42 +0530 | [diff] [blame] | 59 | static unsigned int titsc_readl(struct titsc *ts, unsigned int reg) |
Rachna Patil | 1b8be32 | 2012-03-04 08:11:57 -0800 | [diff] [blame] | 60 | { |
Patil, Rachna | 2b99baf | 2012-10-16 12:55:44 +0530 | [diff] [blame] | 61 | return readl(ts->mfd_tscadc->tscadc_base + reg); |
Rachna Patil | 1b8be32 | 2012-03-04 08:11:57 -0800 | [diff] [blame] | 62 | } |
| 63 | |
Patil, Rachna | 55c04de | 2012-10-16 12:55:42 +0530 | [diff] [blame] | 64 | static void titsc_writel(struct titsc *tsc, unsigned int reg, |
Rachna Patil | 1b8be32 | 2012-03-04 08:11:57 -0800 | [diff] [blame] | 65 | unsigned int val) |
| 66 | { |
Patil, Rachna | 2b99baf | 2012-10-16 12:55:44 +0530 | [diff] [blame] | 67 | writel(val, tsc->mfd_tscadc->tscadc_base + reg); |
Rachna Patil | 1b8be32 | 2012-03-04 08:11:57 -0800 | [diff] [blame] | 68 | } |
| 69 | |
Patil, Rachna | bb76dc0 | 2013-01-24 03:45:06 +0000 | [diff] [blame] | 70 | static int titsc_config_wires(struct titsc *ts_dev) |
| 71 | { |
| 72 | u32 analog_line[4]; |
| 73 | u32 wire_order[4]; |
| 74 | int i, bit_cfg; |
| 75 | |
| 76 | for (i = 0; i < 4; i++) { |
| 77 | /* |
| 78 | * Get the order in which TSC wires are attached |
| 79 | * w.r.t. each of the analog input lines on the EVM. |
| 80 | */ |
| 81 | analog_line[i] = (ts_dev->config_inp[i] & 0xF0) >> 4; |
| 82 | wire_order[i] = ts_dev->config_inp[i] & 0x0F; |
| 83 | if (WARN_ON(analog_line[i] > 7)) |
| 84 | return -EINVAL; |
| 85 | if (WARN_ON(wire_order[i] > ARRAY_SIZE(config_pins))) |
| 86 | return -EINVAL; |
| 87 | } |
| 88 | |
| 89 | for (i = 0; i < 4; i++) { |
| 90 | int an_line; |
| 91 | int wi_order; |
| 92 | |
| 93 | an_line = analog_line[i]; |
| 94 | wi_order = wire_order[i]; |
| 95 | bit_cfg = config_pins[wi_order]; |
| 96 | if (bit_cfg == 0) |
| 97 | return -EINVAL; |
| 98 | switch (wi_order) { |
| 99 | case 0: |
| 100 | ts_dev->bit_xp = bit_cfg; |
| 101 | ts_dev->inp_xp = an_line; |
| 102 | break; |
| 103 | |
| 104 | case 1: |
| 105 | ts_dev->bit_xn = bit_cfg; |
| 106 | ts_dev->inp_xn = an_line; |
| 107 | break; |
| 108 | |
| 109 | case 2: |
| 110 | ts_dev->bit_yp = bit_cfg; |
| 111 | ts_dev->inp_yp = an_line; |
| 112 | break; |
| 113 | case 3: |
| 114 | ts_dev->bit_yn = bit_cfg; |
| 115 | ts_dev->inp_yn = an_line; |
| 116 | break; |
| 117 | } |
| 118 | } |
| 119 | return 0; |
| 120 | } |
| 121 | |
Patil, Rachna | 55c04de | 2012-10-16 12:55:42 +0530 | [diff] [blame] | 122 | static void titsc_step_config(struct titsc *ts_dev) |
Rachna Patil | 1b8be32 | 2012-03-04 08:11:57 -0800 | [diff] [blame] | 123 | { |
| 124 | unsigned int config; |
Sebastian Andrzej Siewior | 8c89630 | 2013-05-29 14:46:21 +0200 | [diff] [blame] | 125 | int i; |
Brad Griffis | 3a59684 | 2015-02-03 11:41:58 -0800 | [diff] [blame] | 126 | int end_step, first_step, tsc_steps; |
Sebastian Andrzej Siewior | 8c89630 | 2013-05-29 14:46:21 +0200 | [diff] [blame] | 127 | u32 stepenable; |
Rachna Patil | 1b8be32 | 2012-03-04 08:11:57 -0800 | [diff] [blame] | 128 | |
| 129 | config = STEPCONFIG_MODE_HWSYNC | |
Patil, Rachna | bb76dc0 | 2013-01-24 03:45:06 +0000 | [diff] [blame] | 130 | STEPCONFIG_AVG_16 | ts_dev->bit_xp; |
Rachna Patil | 1b8be32 | 2012-03-04 08:11:57 -0800 | [diff] [blame] | 131 | switch (ts_dev->wires) { |
| 132 | case 4: |
Patil, Rachna | bb76dc0 | 2013-01-24 03:45:06 +0000 | [diff] [blame] | 133 | config |= STEPCONFIG_INP(ts_dev->inp_yp) | ts_dev->bit_xn; |
Rachna Patil | 1b8be32 | 2012-03-04 08:11:57 -0800 | [diff] [blame] | 134 | break; |
| 135 | case 5: |
Patil, Rachna | bb76dc0 | 2013-01-24 03:45:06 +0000 | [diff] [blame] | 136 | config |= ts_dev->bit_yn | |
| 137 | STEPCONFIG_INP_AN4 | ts_dev->bit_xn | |
| 138 | ts_dev->bit_yp; |
Rachna Patil | 1b8be32 | 2012-03-04 08:11:57 -0800 | [diff] [blame] | 139 | break; |
| 140 | case 8: |
Patil, Rachna | bb76dc0 | 2013-01-24 03:45:06 +0000 | [diff] [blame] | 141 | config |= STEPCONFIG_INP(ts_dev->inp_yp) | ts_dev->bit_xn; |
Rachna Patil | 1b8be32 | 2012-03-04 08:11:57 -0800 | [diff] [blame] | 142 | break; |
| 143 | } |
| 144 | |
Brad Griffis | 3a59684 | 2015-02-03 11:41:58 -0800 | [diff] [blame] | 145 | tsc_steps = ts_dev->coordinate_readouts * 2 + 2; |
| 146 | first_step = TOTAL_STEPS - tsc_steps; |
| 147 | /* Steps 16 to 16-coordinate_readouts is for X */ |
| 148 | end_step = first_step + tsc_steps; |
| 149 | for (i = end_step - ts_dev->coordinate_readouts; i < end_step; i++) { |
Patil, Rachna | 55c04de | 2012-10-16 12:55:42 +0530 | [diff] [blame] | 150 | titsc_writel(ts_dev, REG_STEPCONFIG(i), config); |
| 151 | titsc_writel(ts_dev, REG_STEPDELAY(i), STEPCONFIG_OPENDLY); |
Rachna Patil | 1b8be32 | 2012-03-04 08:11:57 -0800 | [diff] [blame] | 152 | } |
| 153 | |
| 154 | config = 0; |
| 155 | config = STEPCONFIG_MODE_HWSYNC | |
Patil, Rachna | bb76dc0 | 2013-01-24 03:45:06 +0000 | [diff] [blame] | 156 | STEPCONFIG_AVG_16 | ts_dev->bit_yn | |
Sebastian Andrzej Siewior | 8c89630 | 2013-05-29 14:46:21 +0200 | [diff] [blame] | 157 | STEPCONFIG_INM_ADCREFM; |
Rachna Patil | 1b8be32 | 2012-03-04 08:11:57 -0800 | [diff] [blame] | 158 | switch (ts_dev->wires) { |
| 159 | case 4: |
Patil, Rachna | bb76dc0 | 2013-01-24 03:45:06 +0000 | [diff] [blame] | 160 | config |= ts_dev->bit_yp | STEPCONFIG_INP(ts_dev->inp_xp); |
Rachna Patil | 1b8be32 | 2012-03-04 08:11:57 -0800 | [diff] [blame] | 161 | break; |
| 162 | case 5: |
Patil, Rachna | bb76dc0 | 2013-01-24 03:45:06 +0000 | [diff] [blame] | 163 | config |= ts_dev->bit_xp | STEPCONFIG_INP_AN4 | |
| 164 | ts_dev->bit_xn | ts_dev->bit_yp; |
Rachna Patil | 1b8be32 | 2012-03-04 08:11:57 -0800 | [diff] [blame] | 165 | break; |
| 166 | case 8: |
Patil, Rachna | bb76dc0 | 2013-01-24 03:45:06 +0000 | [diff] [blame] | 167 | config |= ts_dev->bit_yp | STEPCONFIG_INP(ts_dev->inp_xp); |
Rachna Patil | 1b8be32 | 2012-03-04 08:11:57 -0800 | [diff] [blame] | 168 | break; |
| 169 | } |
| 170 | |
Brad Griffis | 3a59684 | 2015-02-03 11:41:58 -0800 | [diff] [blame] | 171 | /* 1 ... coordinate_readouts is for Y */ |
| 172 | end_step = first_step + ts_dev->coordinate_readouts; |
| 173 | for (i = first_step; i < end_step; i++) { |
Patil, Rachna | 55c04de | 2012-10-16 12:55:42 +0530 | [diff] [blame] | 174 | titsc_writel(ts_dev, REG_STEPCONFIG(i), config); |
| 175 | titsc_writel(ts_dev, REG_STEPDELAY(i), STEPCONFIG_OPENDLY); |
Rachna Patil | 1b8be32 | 2012-03-04 08:11:57 -0800 | [diff] [blame] | 176 | } |
| 177 | |
Brad Griffis | 344d635 | 2015-02-03 11:44:12 -0800 | [diff] [blame] | 178 | /* Make CHARGECONFIG same as IDLECONFIG */ |
Rachna Patil | 1b8be32 | 2012-03-04 08:11:57 -0800 | [diff] [blame] | 179 | |
Brad Griffis | 344d635 | 2015-02-03 11:44:12 -0800 | [diff] [blame] | 180 | config = titsc_readl(ts_dev, REG_IDLECONFIG); |
Patil, Rachna | 55c04de | 2012-10-16 12:55:42 +0530 | [diff] [blame] | 181 | titsc_writel(ts_dev, REG_CHARGECONFIG, config); |
Vignesh R | bf22361 | 2015-02-03 11:45:34 -0800 | [diff] [blame] | 182 | titsc_writel(ts_dev, REG_CHARGEDELAY, ts_dev->charge_delay); |
Rachna Patil | 1b8be32 | 2012-03-04 08:11:57 -0800 | [diff] [blame] | 183 | |
Brad Griffis | 3a59684 | 2015-02-03 11:41:58 -0800 | [diff] [blame] | 184 | /* coordinate_readouts + 1 ... coordinate_readouts + 2 is for Z */ |
Rachna Patil | 1b8be32 | 2012-03-04 08:11:57 -0800 | [diff] [blame] | 185 | config = STEPCONFIG_MODE_HWSYNC | |
Patil, Rachna | bb76dc0 | 2013-01-24 03:45:06 +0000 | [diff] [blame] | 186 | STEPCONFIG_AVG_16 | ts_dev->bit_yp | |
| 187 | ts_dev->bit_xn | STEPCONFIG_INM_ADCREFM | |
| 188 | STEPCONFIG_INP(ts_dev->inp_xp); |
Sebastian Andrzej Siewior | 8c89630 | 2013-05-29 14:46:21 +0200 | [diff] [blame] | 189 | titsc_writel(ts_dev, REG_STEPCONFIG(end_step), config); |
| 190 | titsc_writel(ts_dev, REG_STEPDELAY(end_step), |
Patil, Rachna | d1fb574 | 2012-10-16 12:55:39 +0530 | [diff] [blame] | 191 | STEPCONFIG_OPENDLY); |
Rachna Patil | 1b8be32 | 2012-03-04 08:11:57 -0800 | [diff] [blame] | 192 | |
Sebastian Andrzej Siewior | 8c89630 | 2013-05-29 14:46:21 +0200 | [diff] [blame] | 193 | end_step++; |
| 194 | config |= STEPCONFIG_INP(ts_dev->inp_yn); |
| 195 | titsc_writel(ts_dev, REG_STEPCONFIG(end_step), config); |
| 196 | titsc_writel(ts_dev, REG_STEPDELAY(end_step), |
Patil, Rachna | d1fb574 | 2012-10-16 12:55:39 +0530 | [diff] [blame] | 197 | STEPCONFIG_OPENDLY); |
Rachna Patil | 1b8be32 | 2012-03-04 08:11:57 -0800 | [diff] [blame] | 198 | |
Brad Griffis | 3a59684 | 2015-02-03 11:41:58 -0800 | [diff] [blame] | 199 | /* The steps end ... end - readouts * 2 + 2 and bit 0 for TS_Charge */ |
| 200 | stepenable = 1; |
| 201 | for (i = 0; i < tsc_steps; i++) |
| 202 | stepenable |= 1 << (first_step + i + 1); |
| 203 | |
Zubair Lutfullah | baee539 | 2013-09-19 07:24:00 +0100 | [diff] [blame] | 204 | ts_dev->step_mask = stepenable; |
Sebastian Andrzej Siewior | 7e170c6 | 2013-12-19 16:28:29 +0100 | [diff] [blame] | 205 | am335x_tsc_se_set_cache(ts_dev->mfd_tscadc, ts_dev->step_mask); |
Rachna Patil | 1b8be32 | 2012-03-04 08:11:57 -0800 | [diff] [blame] | 206 | } |
| 207 | |
Vignesh R | 83edfdf | 2015-02-03 11:47:05 -0800 | [diff] [blame] | 208 | static int titsc_cmp_coord(const void *a, const void *b) |
| 209 | { |
| 210 | return *(int *)a - *(int *)b; |
| 211 | } |
| 212 | |
Patil, Rachna | 55c04de | 2012-10-16 12:55:42 +0530 | [diff] [blame] | 213 | static void titsc_read_coordinates(struct titsc *ts_dev, |
Sebastian Andrzej Siewior | 8c89630 | 2013-05-29 14:46:21 +0200 | [diff] [blame] | 214 | u32 *x, u32 *y, u32 *z1, u32 *z2) |
Rachna Patil | 1b8be32 | 2012-03-04 08:11:57 -0800 | [diff] [blame] | 215 | { |
Vignesh R | 83edfdf | 2015-02-03 11:47:05 -0800 | [diff] [blame] | 216 | unsigned int yvals[7], xvals[7]; |
| 217 | unsigned int i, xsum = 0, ysum = 0; |
Sebastian Andrzej Siewior | 8c89630 | 2013-05-29 14:46:21 +0200 | [diff] [blame] | 218 | unsigned int creads = ts_dev->coordinate_readouts; |
Rachna Patil | 1b8be32 | 2012-03-04 08:11:57 -0800 | [diff] [blame] | 219 | |
Vignesh R | 83edfdf | 2015-02-03 11:47:05 -0800 | [diff] [blame] | 220 | for (i = 0; i < creads; i++) { |
| 221 | yvals[i] = titsc_readl(ts_dev, REG_FIFO0); |
| 222 | yvals[i] &= 0xfff; |
Rachna Patil | 1b8be32 | 2012-03-04 08:11:57 -0800 | [diff] [blame] | 223 | } |
Vignesh R | 83edfdf | 2015-02-03 11:47:05 -0800 | [diff] [blame] | 224 | |
| 225 | *z1 = titsc_readl(ts_dev, REG_FIFO0); |
| 226 | *z1 &= 0xfff; |
| 227 | *z2 = titsc_readl(ts_dev, REG_FIFO0); |
| 228 | *z2 &= 0xfff; |
| 229 | |
| 230 | for (i = 0; i < creads; i++) { |
| 231 | xvals[i] = titsc_readl(ts_dev, REG_FIFO0); |
| 232 | xvals[i] &= 0xfff; |
| 233 | } |
| 234 | |
| 235 | /* |
| 236 | * If co-ordinates readouts is less than 4 then |
| 237 | * report the average. In case of 4 or more |
| 238 | * readouts, sort the co-ordinate samples, drop |
| 239 | * min and max values and report the average of |
| 240 | * remaining values. |
| 241 | */ |
| 242 | if (creads <= 3) { |
| 243 | for (i = 0; i < creads; i++) { |
| 244 | ysum += yvals[i]; |
| 245 | xsum += xvals[i]; |
| 246 | } |
| 247 | ysum /= creads; |
| 248 | xsum /= creads; |
| 249 | } else { |
| 250 | sort(yvals, creads, sizeof(unsigned int), |
| 251 | titsc_cmp_coord, NULL); |
| 252 | sort(xvals, creads, sizeof(unsigned int), |
| 253 | titsc_cmp_coord, NULL); |
| 254 | for (i = 1; i < creads - 1; i++) { |
| 255 | ysum += yvals[i]; |
| 256 | xsum += xvals[i]; |
| 257 | } |
| 258 | ysum /= creads - 2; |
| 259 | xsum /= creads - 2; |
| 260 | } |
| 261 | *y = ysum; |
| 262 | *x = xsum; |
Rachna Patil | 1b8be32 | 2012-03-04 08:11:57 -0800 | [diff] [blame] | 263 | } |
| 264 | |
Patil, Rachna | 55c04de | 2012-10-16 12:55:42 +0530 | [diff] [blame] | 265 | static irqreturn_t titsc_irq(int irq, void *dev) |
Rachna Patil | 1b8be32 | 2012-03-04 08:11:57 -0800 | [diff] [blame] | 266 | { |
Patil, Rachna | 55c04de | 2012-10-16 12:55:42 +0530 | [diff] [blame] | 267 | struct titsc *ts_dev = dev; |
Rachna Patil | 1b8be32 | 2012-03-04 08:11:57 -0800 | [diff] [blame] | 268 | struct input_dev *input_dev = ts_dev->input; |
Brad Griffis | 344d635 | 2015-02-03 11:44:12 -0800 | [diff] [blame] | 269 | unsigned int fsm, status, irqclr = 0; |
Rachna Patil | 1b8be32 | 2012-03-04 08:11:57 -0800 | [diff] [blame] | 270 | unsigned int x = 0, y = 0; |
| 271 | unsigned int z1, z2, z; |
Rachna Patil | 1b8be32 | 2012-03-04 08:11:57 -0800 | [diff] [blame] | 272 | |
Brad Griffis | 344d635 | 2015-02-03 11:44:12 -0800 | [diff] [blame] | 273 | status = titsc_readl(ts_dev, REG_RAWIRQSTATUS); |
| 274 | if (status & IRQENB_HW_PEN) { |
| 275 | ts_dev->pen_down = true; |
Brad Griffis | 344d635 | 2015-02-03 11:44:12 -0800 | [diff] [blame] | 276 | irqclr |= IRQENB_HW_PEN; |
| 277 | } |
| 278 | |
| 279 | if (status & IRQENB_PENUP) { |
| 280 | fsm = titsc_readl(ts_dev, REG_ADCFSM); |
| 281 | if (fsm == ADCFSM_STEPID) { |
| 282 | ts_dev->pen_down = false; |
| 283 | input_report_key(input_dev, BTN_TOUCH, 0); |
| 284 | input_report_abs(input_dev, ABS_PRESSURE, 0); |
| 285 | input_sync(input_dev); |
| 286 | } else { |
| 287 | ts_dev->pen_down = true; |
| 288 | } |
| 289 | irqclr |= IRQENB_PENUP; |
| 290 | } |
| 291 | |
| 292 | if (status & IRQENB_EOS) |
| 293 | irqclr |= IRQENB_EOS; |
| 294 | |
Zubair Lutfullah | baee539 | 2013-09-19 07:24:00 +0100 | [diff] [blame] | 295 | /* |
| 296 | * ADC and touchscreen share the IRQ line. |
| 297 | * FIFO1 interrupts are used by ADC. Handle FIFO0 IRQs here only |
| 298 | */ |
Patil, Rachna | 30af55f | 2012-10-16 12:55:40 +0530 | [diff] [blame] | 299 | if (status & IRQENB_FIFO0THRES) { |
Rachna Patil | 1b8be32 | 2012-03-04 08:11:57 -0800 | [diff] [blame] | 300 | |
Sebastian Andrzej Siewior | 8c89630 | 2013-05-29 14:46:21 +0200 | [diff] [blame] | 301 | titsc_read_coordinates(ts_dev, &x, &y, &z1, &z2); |
Patil, Rachna | 2b99baf | 2012-10-16 12:55:44 +0530 | [diff] [blame] | 302 | |
Rachna Patil | 1b8be32 | 2012-03-04 08:11:57 -0800 | [diff] [blame] | 303 | if (ts_dev->pen_down && z1 != 0 && z2 != 0) { |
| 304 | /* |
| 305 | * Calculate pressure using formula |
| 306 | * Resistance(touch) = x plate resistance * |
| 307 | * x postion/4096 * ((z2 / z1) - 1) |
| 308 | */ |
Sebastian Andrzej Siewior | 8c89630 | 2013-05-29 14:46:21 +0200 | [diff] [blame] | 309 | z = z1 - z2; |
Rachna Patil | 1b8be32 | 2012-03-04 08:11:57 -0800 | [diff] [blame] | 310 | z *= x; |
| 311 | z *= ts_dev->x_plate_resistance; |
Sebastian Andrzej Siewior | 8c89630 | 2013-05-29 14:46:21 +0200 | [diff] [blame] | 312 | z /= z2; |
Rachna Patil | 1b8be32 | 2012-03-04 08:11:57 -0800 | [diff] [blame] | 313 | z = (z + 2047) >> 12; |
| 314 | |
| 315 | if (z <= MAX_12BIT) { |
| 316 | input_report_abs(input_dev, ABS_X, x); |
| 317 | input_report_abs(input_dev, ABS_Y, y); |
| 318 | input_report_abs(input_dev, ABS_PRESSURE, z); |
| 319 | input_report_key(input_dev, BTN_TOUCH, 1); |
| 320 | input_sync(input_dev); |
| 321 | } |
| 322 | } |
Patil, Rachna | 30af55f | 2012-10-16 12:55:40 +0530 | [diff] [blame] | 323 | irqclr |= IRQENB_FIFO0THRES; |
Rachna Patil | 1b8be32 | 2012-03-04 08:11:57 -0800 | [diff] [blame] | 324 | } |
Sebastian Andrzej Siewior | 9a28b88 | 2013-06-05 16:30:00 +0200 | [diff] [blame] | 325 | if (irqclr) { |
| 326 | titsc_writel(ts_dev, REG_IRQSTATUS, irqclr); |
Brad Griffis | 344d635 | 2015-02-03 11:44:12 -0800 | [diff] [blame] | 327 | if (status & IRQENB_EOS) |
| 328 | am335x_tsc_se_set_cache(ts_dev->mfd_tscadc, |
| 329 | ts_dev->step_mask); |
Sebastian Andrzej Siewior | 9a28b88 | 2013-06-05 16:30:00 +0200 | [diff] [blame] | 330 | return IRQ_HANDLED; |
| 331 | } |
| 332 | return IRQ_NONE; |
Rachna Patil | 1b8be32 | 2012-03-04 08:11:57 -0800 | [diff] [blame] | 333 | } |
| 334 | |
Patil, Rachna | 0396310 | 2013-01-24 03:45:10 +0000 | [diff] [blame] | 335 | static int titsc_parse_dt(struct platform_device *pdev, |
| 336 | struct titsc *ts_dev) |
| 337 | { |
| 338 | struct device_node *node = pdev->dev.of_node; |
| 339 | int err; |
| 340 | |
| 341 | if (!node) |
| 342 | return -EINVAL; |
| 343 | |
| 344 | err = of_property_read_u32(node, "ti,wires", &ts_dev->wires); |
| 345 | if (err < 0) |
| 346 | return err; |
| 347 | switch (ts_dev->wires) { |
| 348 | case 4: |
| 349 | case 5: |
| 350 | case 8: |
| 351 | break; |
| 352 | default: |
| 353 | return -EINVAL; |
| 354 | } |
| 355 | |
| 356 | err = of_property_read_u32(node, "ti,x-plate-resistance", |
| 357 | &ts_dev->x_plate_resistance); |
| 358 | if (err < 0) |
| 359 | return err; |
| 360 | |
Felipe Balbi | c9aeb24 | 2013-11-10 23:56:43 -0800 | [diff] [blame] | 361 | /* |
| 362 | * Try with the new binding first. If it fails, try again with |
| 363 | * bogus, miss-spelled version. |
| 364 | */ |
| 365 | err = of_property_read_u32(node, "ti,coordinate-readouts", |
Patil, Rachna | 0396310 | 2013-01-24 03:45:10 +0000 | [diff] [blame] | 366 | &ts_dev->coordinate_readouts); |
Felipe Balbi | 31972f6 | 2014-06-15 00:15:09 -0700 | [diff] [blame] | 367 | if (err < 0) { |
| 368 | dev_warn(&pdev->dev, "please use 'ti,coordinate-readouts' instead\n"); |
Felipe Balbi | c9aeb24 | 2013-11-10 23:56:43 -0800 | [diff] [blame] | 369 | err = of_property_read_u32(node, "ti,coordiante-readouts", |
| 370 | &ts_dev->coordinate_readouts); |
Felipe Balbi | 31972f6 | 2014-06-15 00:15:09 -0700 | [diff] [blame] | 371 | } |
| 372 | |
Felipe Balbi | c9aeb24 | 2013-11-10 23:56:43 -0800 | [diff] [blame] | 373 | if (err < 0) |
Patil, Rachna | 0396310 | 2013-01-24 03:45:10 +0000 | [diff] [blame] | 374 | return err; |
| 375 | |
Vignesh R | 83edfdf | 2015-02-03 11:47:05 -0800 | [diff] [blame] | 376 | if (ts_dev->coordinate_readouts <= 0) { |
| 377 | dev_warn(&pdev->dev, |
| 378 | "invalid co-ordinate readouts, resetting it to 5\n"); |
| 379 | ts_dev->coordinate_readouts = 5; |
| 380 | } |
| 381 | |
Vignesh R | bf22361 | 2015-02-03 11:45:34 -0800 | [diff] [blame] | 382 | err = of_property_read_u32(node, "ti,charge-delay", |
| 383 | &ts_dev->charge_delay); |
| 384 | /* |
| 385 | * If ti,charge-delay value is not specified, then use |
| 386 | * CHARGEDLY_OPENDLY as the default value. |
| 387 | */ |
| 388 | if (err < 0) { |
| 389 | ts_dev->charge_delay = CHARGEDLY_OPENDLY; |
| 390 | dev_warn(&pdev->dev, "ti,charge-delay not specified\n"); |
| 391 | } |
| 392 | |
Patil, Rachna | 0396310 | 2013-01-24 03:45:10 +0000 | [diff] [blame] | 393 | return of_property_read_u32_array(node, "ti,wire-config", |
| 394 | ts_dev->config_inp, ARRAY_SIZE(ts_dev->config_inp)); |
Rachna Patil | 1b8be32 | 2012-03-04 08:11:57 -0800 | [diff] [blame] | 395 | } |
| 396 | |
| 397 | /* |
| 398 | * The functions for inserting/removing driver as a module. |
| 399 | */ |
| 400 | |
Linus Torvalds | 31564cb | 2012-12-18 12:46:37 -0800 | [diff] [blame] | 401 | static int titsc_probe(struct platform_device *pdev) |
Rachna Patil | 1b8be32 | 2012-03-04 08:11:57 -0800 | [diff] [blame] | 402 | { |
Patil, Rachna | 55c04de | 2012-10-16 12:55:42 +0530 | [diff] [blame] | 403 | struct titsc *ts_dev; |
Rachna Patil | 1b8be32 | 2012-03-04 08:11:57 -0800 | [diff] [blame] | 404 | struct input_dev *input_dev; |
Sebastian Andrzej Siewior | a9bce1b | 2013-06-05 16:13:47 +0200 | [diff] [blame] | 405 | struct ti_tscadc_dev *tscadc_dev = ti_tscadc_dev_get(pdev); |
Rachna Patil | 1b8be32 | 2012-03-04 08:11:57 -0800 | [diff] [blame] | 406 | int err; |
Patil, Rachna | 2b99baf | 2012-10-16 12:55:44 +0530 | [diff] [blame] | 407 | |
Rachna Patil | 1b8be32 | 2012-03-04 08:11:57 -0800 | [diff] [blame] | 408 | /* Allocate memory for device */ |
Patil, Rachna | 55c04de | 2012-10-16 12:55:42 +0530 | [diff] [blame] | 409 | ts_dev = kzalloc(sizeof(struct titsc), GFP_KERNEL); |
Rachna Patil | 1b8be32 | 2012-03-04 08:11:57 -0800 | [diff] [blame] | 410 | input_dev = input_allocate_device(); |
| 411 | if (!ts_dev || !input_dev) { |
| 412 | dev_err(&pdev->dev, "failed to allocate memory.\n"); |
| 413 | err = -ENOMEM; |
| 414 | goto err_free_mem; |
| 415 | } |
| 416 | |
Patil, Rachna | 2b99baf | 2012-10-16 12:55:44 +0530 | [diff] [blame] | 417 | tscadc_dev->tsc = ts_dev; |
| 418 | ts_dev->mfd_tscadc = tscadc_dev; |
Rachna Patil | 1b8be32 | 2012-03-04 08:11:57 -0800 | [diff] [blame] | 419 | ts_dev->input = input_dev; |
Patil, Rachna | 2b99baf | 2012-10-16 12:55:44 +0530 | [diff] [blame] | 420 | ts_dev->irq = tscadc_dev->irq; |
Patil, Rachna | 0396310 | 2013-01-24 03:45:10 +0000 | [diff] [blame] | 421 | |
Sebastian Andrzej Siewior | b9194fd | 2013-05-21 17:39:13 +0200 | [diff] [blame] | 422 | err = titsc_parse_dt(pdev, ts_dev); |
Patil, Rachna | 0396310 | 2013-01-24 03:45:10 +0000 | [diff] [blame] | 423 | if (err) { |
| 424 | dev_err(&pdev->dev, "Could not find valid DT data.\n"); |
| 425 | goto err_free_mem; |
| 426 | } |
Rachna Patil | 1b8be32 | 2012-03-04 08:11:57 -0800 | [diff] [blame] | 427 | |
Patil, Rachna | 55c04de | 2012-10-16 12:55:42 +0530 | [diff] [blame] | 428 | err = request_irq(ts_dev->irq, titsc_irq, |
Zubair Lutfullah | baee539 | 2013-09-19 07:24:00 +0100 | [diff] [blame] | 429 | IRQF_SHARED, pdev->dev.driver->name, ts_dev); |
Rachna Patil | 1b8be32 | 2012-03-04 08:11:57 -0800 | [diff] [blame] | 430 | if (err) { |
| 431 | dev_err(&pdev->dev, "failed to allocate irq.\n"); |
Patil, Rachna | 2b99baf | 2012-10-16 12:55:44 +0530 | [diff] [blame] | 432 | goto err_free_mem; |
Rachna Patil | 1b8be32 | 2012-03-04 08:11:57 -0800 | [diff] [blame] | 433 | } |
| 434 | |
Patil, Rachna | 55c04de | 2012-10-16 12:55:42 +0530 | [diff] [blame] | 435 | titsc_writel(ts_dev, REG_IRQENABLE, IRQENB_FIFO0THRES); |
Brad Griffis | 344d635 | 2015-02-03 11:44:12 -0800 | [diff] [blame] | 436 | titsc_writel(ts_dev, REG_IRQENABLE, IRQENB_EOS); |
Patil, Rachna | bb76dc0 | 2013-01-24 03:45:06 +0000 | [diff] [blame] | 437 | err = titsc_config_wires(ts_dev); |
| 438 | if (err) { |
| 439 | dev_err(&pdev->dev, "wrong i/p wire configuration\n"); |
| 440 | goto err_free_irq; |
| 441 | } |
Patil, Rachna | 55c04de | 2012-10-16 12:55:42 +0530 | [diff] [blame] | 442 | titsc_step_config(ts_dev); |
Sebastian Andrzej Siewior | 8c89630 | 2013-05-29 14:46:21 +0200 | [diff] [blame] | 443 | titsc_writel(ts_dev, REG_FIFO0THR, |
| 444 | ts_dev->coordinate_readouts * 2 + 2 - 1); |
Rachna Patil | 1b8be32 | 2012-03-04 08:11:57 -0800 | [diff] [blame] | 445 | |
Patil, Rachna | 2b99baf | 2012-10-16 12:55:44 +0530 | [diff] [blame] | 446 | input_dev->name = "ti-tsc"; |
Rachna Patil | 1b8be32 | 2012-03-04 08:11:57 -0800 | [diff] [blame] | 447 | input_dev->dev.parent = &pdev->dev; |
| 448 | |
| 449 | input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS); |
| 450 | input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH); |
| 451 | |
| 452 | input_set_abs_params(input_dev, ABS_X, 0, MAX_12BIT, 0, 0); |
| 453 | input_set_abs_params(input_dev, ABS_Y, 0, MAX_12BIT, 0, 0); |
| 454 | input_set_abs_params(input_dev, ABS_PRESSURE, 0, MAX_12BIT, 0, 0); |
| 455 | |
| 456 | /* register to the input system */ |
| 457 | err = input_register_device(input_dev); |
| 458 | if (err) |
Patil, Rachna | 2b99baf | 2012-10-16 12:55:44 +0530 | [diff] [blame] | 459 | goto err_free_irq; |
Rachna Patil | 1b8be32 | 2012-03-04 08:11:57 -0800 | [diff] [blame] | 460 | |
| 461 | platform_set_drvdata(pdev, ts_dev); |
| 462 | return 0; |
| 463 | |
Rachna Patil | 1b8be32 | 2012-03-04 08:11:57 -0800 | [diff] [blame] | 464 | err_free_irq: |
| 465 | free_irq(ts_dev->irq, ts_dev); |
Rachna Patil | 1b8be32 | 2012-03-04 08:11:57 -0800 | [diff] [blame] | 466 | err_free_mem: |
| 467 | input_free_device(input_dev); |
| 468 | kfree(ts_dev); |
| 469 | return err; |
| 470 | } |
| 471 | |
Linus Torvalds | 31564cb | 2012-12-18 12:46:37 -0800 | [diff] [blame] | 472 | static int titsc_remove(struct platform_device *pdev) |
Rachna Patil | 1b8be32 | 2012-03-04 08:11:57 -0800 | [diff] [blame] | 473 | { |
Sebastian Andrzej Siewior | a9bce1b | 2013-06-05 16:13:47 +0200 | [diff] [blame] | 474 | struct titsc *ts_dev = platform_get_drvdata(pdev); |
| 475 | u32 steps; |
Rachna Patil | 1b8be32 | 2012-03-04 08:11:57 -0800 | [diff] [blame] | 476 | |
| 477 | free_irq(ts_dev->irq, ts_dev); |
| 478 | |
Patil, Rachna | abeccee | 2013-01-24 03:45:05 +0000 | [diff] [blame] | 479 | /* total steps followed by the enable mask */ |
Patil, Rachna | 0396310 | 2013-01-24 03:45:10 +0000 | [diff] [blame] | 480 | steps = 2 * ts_dev->coordinate_readouts + 2; |
Patil, Rachna | abeccee | 2013-01-24 03:45:05 +0000 | [diff] [blame] | 481 | steps = (1 << steps) - 1; |
| 482 | am335x_tsc_se_clr(ts_dev->mfd_tscadc, steps); |
| 483 | |
Rachna Patil | 1b8be32 | 2012-03-04 08:11:57 -0800 | [diff] [blame] | 484 | input_unregister_device(ts_dev->input); |
| 485 | |
Patil, Rachna | 2b99baf | 2012-10-16 12:55:44 +0530 | [diff] [blame] | 486 | kfree(ts_dev); |
Rachna Patil | 1b8be32 | 2012-03-04 08:11:57 -0800 | [diff] [blame] | 487 | return 0; |
| 488 | } |
| 489 | |
Patil, Rachna | 2b99baf | 2012-10-16 12:55:44 +0530 | [diff] [blame] | 490 | #ifdef CONFIG_PM |
| 491 | static int titsc_suspend(struct device *dev) |
| 492 | { |
Sebastian Andrzej Siewior | a9bce1b | 2013-06-05 16:13:47 +0200 | [diff] [blame] | 493 | struct titsc *ts_dev = dev_get_drvdata(dev); |
| 494 | struct ti_tscadc_dev *tscadc_dev; |
Patil, Rachna | 2b99baf | 2012-10-16 12:55:44 +0530 | [diff] [blame] | 495 | unsigned int idle; |
| 496 | |
Sebastian Andrzej Siewior | a9bce1b | 2013-06-05 16:13:47 +0200 | [diff] [blame] | 497 | tscadc_dev = ti_tscadc_dev_get(to_platform_device(dev)); |
Patil, Rachna | 2b99baf | 2012-10-16 12:55:44 +0530 | [diff] [blame] | 498 | if (device_may_wakeup(tscadc_dev->dev)) { |
| 499 | idle = titsc_readl(ts_dev, REG_IRQENABLE); |
| 500 | titsc_writel(ts_dev, REG_IRQENABLE, |
| 501 | (idle | IRQENB_HW_PEN)); |
| 502 | titsc_writel(ts_dev, REG_IRQWAKEUP, IRQWKUP_ENB); |
| 503 | } |
| 504 | return 0; |
| 505 | } |
| 506 | |
| 507 | static int titsc_resume(struct device *dev) |
| 508 | { |
Sebastian Andrzej Siewior | a9bce1b | 2013-06-05 16:13:47 +0200 | [diff] [blame] | 509 | struct titsc *ts_dev = dev_get_drvdata(dev); |
| 510 | struct ti_tscadc_dev *tscadc_dev; |
Patil, Rachna | 2b99baf | 2012-10-16 12:55:44 +0530 | [diff] [blame] | 511 | |
Sebastian Andrzej Siewior | a9bce1b | 2013-06-05 16:13:47 +0200 | [diff] [blame] | 512 | tscadc_dev = ti_tscadc_dev_get(to_platform_device(dev)); |
Patil, Rachna | 2b99baf | 2012-10-16 12:55:44 +0530 | [diff] [blame] | 513 | if (device_may_wakeup(tscadc_dev->dev)) { |
| 514 | titsc_writel(ts_dev, REG_IRQWAKEUP, |
| 515 | 0x00); |
| 516 | titsc_writel(ts_dev, REG_IRQCLR, IRQENB_HW_PEN); |
| 517 | } |
| 518 | titsc_step_config(ts_dev); |
| 519 | titsc_writel(ts_dev, REG_FIFO0THR, |
Sebastian Andrzej Siewior | 8c89630 | 2013-05-29 14:46:21 +0200 | [diff] [blame] | 520 | ts_dev->coordinate_readouts * 2 + 2 - 1); |
Patil, Rachna | 2b99baf | 2012-10-16 12:55:44 +0530 | [diff] [blame] | 521 | return 0; |
| 522 | } |
| 523 | |
| 524 | static const struct dev_pm_ops titsc_pm_ops = { |
| 525 | .suspend = titsc_suspend, |
| 526 | .resume = titsc_resume, |
| 527 | }; |
| 528 | #define TITSC_PM_OPS (&titsc_pm_ops) |
| 529 | #else |
| 530 | #define TITSC_PM_OPS NULL |
| 531 | #endif |
| 532 | |
Patil, Rachna | 0396310 | 2013-01-24 03:45:10 +0000 | [diff] [blame] | 533 | static const struct of_device_id ti_tsc_dt_ids[] = { |
| 534 | { .compatible = "ti,am3359-tsc", }, |
| 535 | { } |
| 536 | }; |
| 537 | MODULE_DEVICE_TABLE(of, ti_tsc_dt_ids); |
| 538 | |
Rachna Patil | 1b8be32 | 2012-03-04 08:11:57 -0800 | [diff] [blame] | 539 | static struct platform_driver ti_tsc_driver = { |
Patil, Rachna | 55c04de | 2012-10-16 12:55:42 +0530 | [diff] [blame] | 540 | .probe = titsc_probe, |
Linus Torvalds | 31564cb | 2012-12-18 12:46:37 -0800 | [diff] [blame] | 541 | .remove = titsc_remove, |
Rachna Patil | 1b8be32 | 2012-03-04 08:11:57 -0800 | [diff] [blame] | 542 | .driver = { |
Sebastian Andrzej Siewior | 5f184e6 | 2013-05-27 17:08:28 +0200 | [diff] [blame] | 543 | .name = "TI-am335x-tsc", |
Patil, Rachna | 2b99baf | 2012-10-16 12:55:44 +0530 | [diff] [blame] | 544 | .pm = TITSC_PM_OPS, |
Sachin Kamat | 8e6146b | 2013-10-06 00:53:52 -0700 | [diff] [blame] | 545 | .of_match_table = ti_tsc_dt_ids, |
Rachna Patil | 1b8be32 | 2012-03-04 08:11:57 -0800 | [diff] [blame] | 546 | }, |
| 547 | }; |
| 548 | module_platform_driver(ti_tsc_driver); |
| 549 | |
| 550 | MODULE_DESCRIPTION("TI touchscreen controller driver"); |
| 551 | MODULE_AUTHOR("Rachna Patil <rachna@ti.com>"); |
| 552 | MODULE_LICENSE("GPL"); |