Michael Welling | 6ac2438 | 2015-11-02 17:45:51 -0800 | [diff] [blame] | 1 | /* |
| 2 | * TSC2004/TSC2005 touchscreen driver core |
| 3 | * |
| 4 | * Copyright (C) 2006-2010 Nokia Corporation |
| 5 | * Copyright (C) 2015 QWERTY Embedded Design |
| 6 | * Copyright (C) 2015 EMAC Inc. |
| 7 | * |
| 8 | * Author: Lauri Leukkunen <lauri.leukkunen@nokia.com> |
| 9 | * based on TSC2301 driver by Klaus K. Pedersen <klaus.k.pedersen@nokia.com> |
| 10 | * |
| 11 | * This program is free software; you can redistribute it and/or modify |
| 12 | * it under the terms of the GNU General Public License as published by |
| 13 | * the Free Software Foundation; either version 2 of the License, or |
| 14 | * (at your option) any later version. |
| 15 | * |
| 16 | * This program is distributed in the hope that it will be useful, |
| 17 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 18 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 19 | * GNU General Public License for more details. |
| 20 | */ |
| 21 | |
| 22 | #include <linux/kernel.h> |
| 23 | #include <linux/module.h> |
| 24 | #include <linux/input.h> |
| 25 | #include <linux/input/touchscreen.h> |
| 26 | #include <linux/interrupt.h> |
| 27 | #include <linux/delay.h> |
| 28 | #include <linux/pm.h> |
| 29 | #include <linux/of.h> |
| 30 | #include <linux/spi/tsc2005.h> |
| 31 | #include <linux/regulator/consumer.h> |
| 32 | #include <linux/regmap.h> |
| 33 | #include <linux/gpio/consumer.h> |
| 34 | #include "tsc200x-core.h" |
| 35 | |
| 36 | /* |
| 37 | * The touchscreen interface operates as follows: |
| 38 | * |
| 39 | * 1) Pen is pressed against the touchscreen. |
Michael Welling | ef3b98c | 2015-11-02 17:51:49 -0800 | [diff] [blame] | 40 | * 2) TSC200X performs AD conversion. |
| 41 | * 3) After the conversion is done TSC200X drives DAV line down. |
| 42 | * 4) GPIO IRQ is received and tsc200x_irq_thread() is scheduled. |
| 43 | * 5) tsc200x_irq_thread() queues up a transfer to fetch the x, y, z1, z2 |
Michael Welling | 6ac2438 | 2015-11-02 17:45:51 -0800 | [diff] [blame] | 44 | * values. |
Michael Welling | ef3b98c | 2015-11-02 17:51:49 -0800 | [diff] [blame] | 45 | * 6) tsc200x_irq_thread() reports coordinates to input layer and sets up |
| 46 | * tsc200x_penup_timer() to be called after TSC200X_PENUP_TIME_MS (40ms). |
Michael Welling | 6ac2438 | 2015-11-02 17:45:51 -0800 | [diff] [blame] | 47 | * 7) When the penup timer expires, there have not been touch or DAV interrupts |
| 48 | * during the last 40ms which means the pen has been lifted. |
| 49 | * |
Michael Welling | ef3b98c | 2015-11-02 17:51:49 -0800 | [diff] [blame] | 50 | * ESD recovery via a hardware reset is done if the TSC200X doesn't respond |
Michael Welling | 6ac2438 | 2015-11-02 17:45:51 -0800 | [diff] [blame] | 51 | * after a configurable period (in ms) of activity. If esd_timeout is 0, the |
| 52 | * watchdog is disabled. |
| 53 | */ |
| 54 | |
Michael Welling | ef3b98c | 2015-11-02 17:51:49 -0800 | [diff] [blame] | 55 | static const struct regmap_range tsc200x_writable_ranges[] = { |
| 56 | regmap_reg_range(TSC200X_REG_AUX_HIGH, TSC200X_REG_CFR2), |
Michael Welling | 6ac2438 | 2015-11-02 17:45:51 -0800 | [diff] [blame] | 57 | }; |
| 58 | |
Michael Welling | ef3b98c | 2015-11-02 17:51:49 -0800 | [diff] [blame] | 59 | static const struct regmap_access_table tsc200x_writable_table = { |
| 60 | .yes_ranges = tsc200x_writable_ranges, |
| 61 | .n_yes_ranges = ARRAY_SIZE(tsc200x_writable_ranges), |
Michael Welling | 6ac2438 | 2015-11-02 17:45:51 -0800 | [diff] [blame] | 62 | }; |
| 63 | |
| 64 | const struct regmap_config tsc200x_regmap_config = { |
| 65 | .reg_bits = 8, |
| 66 | .val_bits = 16, |
| 67 | .reg_stride = 0x08, |
| 68 | .max_register = 0x78, |
Michael Welling | ef3b98c | 2015-11-02 17:51:49 -0800 | [diff] [blame] | 69 | .read_flag_mask = TSC200X_REG_READ, |
| 70 | .write_flag_mask = TSC200X_REG_PND0, |
| 71 | .wr_table = &tsc200x_writable_table, |
Michael Welling | 6ac2438 | 2015-11-02 17:45:51 -0800 | [diff] [blame] | 72 | .use_single_rw = true, |
| 73 | }; |
| 74 | EXPORT_SYMBOL_GPL(tsc200x_regmap_config); |
| 75 | |
Michael Welling | ef3b98c | 2015-11-02 17:51:49 -0800 | [diff] [blame] | 76 | struct tsc200x_data { |
Michael Welling | 6ac2438 | 2015-11-02 17:45:51 -0800 | [diff] [blame] | 77 | u16 x; |
| 78 | u16 y; |
| 79 | u16 z1; |
| 80 | u16 z2; |
| 81 | } __packed; |
Michael Welling | ef3b98c | 2015-11-02 17:51:49 -0800 | [diff] [blame] | 82 | #define TSC200X_DATA_REGS 4 |
Michael Welling | 6ac2438 | 2015-11-02 17:45:51 -0800 | [diff] [blame] | 83 | |
Michael Welling | ef3b98c | 2015-11-02 17:51:49 -0800 | [diff] [blame] | 84 | struct tsc200x { |
Michael Welling | 6ac2438 | 2015-11-02 17:45:51 -0800 | [diff] [blame] | 85 | struct device *dev; |
| 86 | struct regmap *regmap; |
| 87 | __u16 bustype; |
| 88 | |
| 89 | struct input_dev *idev; |
| 90 | char phys[32]; |
| 91 | |
| 92 | struct mutex mutex; |
| 93 | |
| 94 | /* raw copy of previous x,y,z */ |
| 95 | int in_x; |
| 96 | int in_y; |
| 97 | int in_z1; |
| 98 | int in_z2; |
| 99 | |
| 100 | spinlock_t lock; |
| 101 | struct timer_list penup_timer; |
| 102 | |
| 103 | unsigned int esd_timeout; |
| 104 | struct delayed_work esd_work; |
| 105 | unsigned long last_valid_interrupt; |
| 106 | |
| 107 | unsigned int x_plate_ohm; |
| 108 | |
| 109 | bool opened; |
| 110 | bool suspended; |
| 111 | |
| 112 | bool pen_down; |
| 113 | |
| 114 | struct regulator *vio; |
| 115 | |
| 116 | struct gpio_desc *reset_gpio; |
| 117 | void (*set_reset)(bool enable); |
| 118 | int (*tsc200x_cmd)(struct device *dev, u8 cmd); |
| 119 | int irq; |
| 120 | }; |
| 121 | |
Michael Welling | ef3b98c | 2015-11-02 17:51:49 -0800 | [diff] [blame] | 122 | static void tsc200x_update_pen_state(struct tsc200x *ts, |
Michael Welling | 6ac2438 | 2015-11-02 17:45:51 -0800 | [diff] [blame] | 123 | int x, int y, int pressure) |
| 124 | { |
| 125 | if (pressure) { |
| 126 | input_report_abs(ts->idev, ABS_X, x); |
| 127 | input_report_abs(ts->idev, ABS_Y, y); |
| 128 | input_report_abs(ts->idev, ABS_PRESSURE, pressure); |
| 129 | if (!ts->pen_down) { |
| 130 | input_report_key(ts->idev, BTN_TOUCH, !!pressure); |
| 131 | ts->pen_down = true; |
| 132 | } |
| 133 | } else { |
| 134 | input_report_abs(ts->idev, ABS_PRESSURE, 0); |
| 135 | if (ts->pen_down) { |
| 136 | input_report_key(ts->idev, BTN_TOUCH, 0); |
| 137 | ts->pen_down = false; |
| 138 | } |
| 139 | } |
| 140 | input_sync(ts->idev); |
| 141 | dev_dbg(ts->dev, "point(%4d,%4d), pressure (%4d)\n", x, y, |
| 142 | pressure); |
| 143 | } |
| 144 | |
Michael Welling | ef3b98c | 2015-11-02 17:51:49 -0800 | [diff] [blame] | 145 | static irqreturn_t tsc200x_irq_thread(int irq, void *_ts) |
Michael Welling | 6ac2438 | 2015-11-02 17:45:51 -0800 | [diff] [blame] | 146 | { |
Michael Welling | ef3b98c | 2015-11-02 17:51:49 -0800 | [diff] [blame] | 147 | struct tsc200x *ts = _ts; |
Michael Welling | 6ac2438 | 2015-11-02 17:45:51 -0800 | [diff] [blame] | 148 | unsigned long flags; |
| 149 | unsigned int pressure; |
Michael Welling | ef3b98c | 2015-11-02 17:51:49 -0800 | [diff] [blame] | 150 | struct tsc200x_data tsdata; |
Michael Welling | 6ac2438 | 2015-11-02 17:45:51 -0800 | [diff] [blame] | 151 | int error; |
| 152 | |
| 153 | /* read the coordinates */ |
Michael Welling | ef3b98c | 2015-11-02 17:51:49 -0800 | [diff] [blame] | 154 | error = regmap_bulk_read(ts->regmap, TSC200X_REG_X, &tsdata, |
| 155 | TSC200X_DATA_REGS); |
Michael Welling | 6ac2438 | 2015-11-02 17:45:51 -0800 | [diff] [blame] | 156 | if (unlikely(error)) |
| 157 | goto out; |
| 158 | |
| 159 | /* validate position */ |
| 160 | if (unlikely(tsdata.x > MAX_12BIT || tsdata.y > MAX_12BIT)) |
| 161 | goto out; |
| 162 | |
| 163 | /* Skip reading if the pressure components are out of range */ |
| 164 | if (unlikely(tsdata.z1 == 0 || tsdata.z2 > MAX_12BIT)) |
| 165 | goto out; |
| 166 | if (unlikely(tsdata.z1 >= tsdata.z2)) |
| 167 | goto out; |
| 168 | |
| 169 | /* |
| 170 | * Skip point if this is a pen down with the exact same values as |
| 171 | * the value before pen-up - that implies SPI fed us stale data |
| 172 | */ |
| 173 | if (!ts->pen_down && |
| 174 | ts->in_x == tsdata.x && ts->in_y == tsdata.y && |
| 175 | ts->in_z1 == tsdata.z1 && ts->in_z2 == tsdata.z2) { |
| 176 | goto out; |
| 177 | } |
| 178 | |
| 179 | /* |
| 180 | * At this point we are happy we have a valid and useful reading. |
| 181 | * Remember it for later comparisons. We may now begin downsampling. |
| 182 | */ |
| 183 | ts->in_x = tsdata.x; |
| 184 | ts->in_y = tsdata.y; |
| 185 | ts->in_z1 = tsdata.z1; |
| 186 | ts->in_z2 = tsdata.z2; |
| 187 | |
| 188 | /* Compute touch pressure resistance using equation #1 */ |
| 189 | pressure = tsdata.x * (tsdata.z2 - tsdata.z1) / tsdata.z1; |
| 190 | pressure = pressure * ts->x_plate_ohm / 4096; |
| 191 | if (unlikely(pressure > MAX_12BIT)) |
| 192 | goto out; |
| 193 | |
| 194 | spin_lock_irqsave(&ts->lock, flags); |
| 195 | |
Michael Welling | ef3b98c | 2015-11-02 17:51:49 -0800 | [diff] [blame] | 196 | tsc200x_update_pen_state(ts, tsdata.x, tsdata.y, pressure); |
Michael Welling | 6ac2438 | 2015-11-02 17:45:51 -0800 | [diff] [blame] | 197 | mod_timer(&ts->penup_timer, |
Michael Welling | ef3b98c | 2015-11-02 17:51:49 -0800 | [diff] [blame] | 198 | jiffies + msecs_to_jiffies(TSC200X_PENUP_TIME_MS)); |
Michael Welling | 6ac2438 | 2015-11-02 17:45:51 -0800 | [diff] [blame] | 199 | |
| 200 | spin_unlock_irqrestore(&ts->lock, flags); |
| 201 | |
| 202 | ts->last_valid_interrupt = jiffies; |
| 203 | out: |
| 204 | return IRQ_HANDLED; |
| 205 | } |
| 206 | |
Michael Welling | ef3b98c | 2015-11-02 17:51:49 -0800 | [diff] [blame] | 207 | static void tsc200x_penup_timer(unsigned long data) |
Michael Welling | 6ac2438 | 2015-11-02 17:45:51 -0800 | [diff] [blame] | 208 | { |
Michael Welling | ef3b98c | 2015-11-02 17:51:49 -0800 | [diff] [blame] | 209 | struct tsc200x *ts = (struct tsc200x *)data; |
Michael Welling | 6ac2438 | 2015-11-02 17:45:51 -0800 | [diff] [blame] | 210 | unsigned long flags; |
| 211 | |
| 212 | spin_lock_irqsave(&ts->lock, flags); |
Michael Welling | ef3b98c | 2015-11-02 17:51:49 -0800 | [diff] [blame] | 213 | tsc200x_update_pen_state(ts, 0, 0, 0); |
Michael Welling | 6ac2438 | 2015-11-02 17:45:51 -0800 | [diff] [blame] | 214 | spin_unlock_irqrestore(&ts->lock, flags); |
| 215 | } |
| 216 | |
Michael Welling | ef3b98c | 2015-11-02 17:51:49 -0800 | [diff] [blame] | 217 | static void tsc200x_start_scan(struct tsc200x *ts) |
Michael Welling | 6ac2438 | 2015-11-02 17:45:51 -0800 | [diff] [blame] | 218 | { |
Michael Welling | ef3b98c | 2015-11-02 17:51:49 -0800 | [diff] [blame] | 219 | regmap_write(ts->regmap, TSC200X_REG_CFR0, TSC200X_CFR0_INITVALUE); |
| 220 | regmap_write(ts->regmap, TSC200X_REG_CFR1, TSC200X_CFR1_INITVALUE); |
| 221 | regmap_write(ts->regmap, TSC200X_REG_CFR2, TSC200X_CFR2_INITVALUE); |
| 222 | ts->tsc200x_cmd(ts->dev, TSC200X_CMD_NORMAL); |
Michael Welling | 6ac2438 | 2015-11-02 17:45:51 -0800 | [diff] [blame] | 223 | } |
| 224 | |
Michael Welling | ef3b98c | 2015-11-02 17:51:49 -0800 | [diff] [blame] | 225 | static void tsc200x_stop_scan(struct tsc200x *ts) |
Michael Welling | 6ac2438 | 2015-11-02 17:45:51 -0800 | [diff] [blame] | 226 | { |
Michael Welling | ef3b98c | 2015-11-02 17:51:49 -0800 | [diff] [blame] | 227 | ts->tsc200x_cmd(ts->dev, TSC200X_CMD_STOP); |
Michael Welling | 6ac2438 | 2015-11-02 17:45:51 -0800 | [diff] [blame] | 228 | } |
| 229 | |
Michael Welling | ef3b98c | 2015-11-02 17:51:49 -0800 | [diff] [blame] | 230 | static void tsc200x_set_reset(struct tsc200x *ts, bool enable) |
Michael Welling | 6ac2438 | 2015-11-02 17:45:51 -0800 | [diff] [blame] | 231 | { |
| 232 | if (ts->reset_gpio) |
| 233 | gpiod_set_value_cansleep(ts->reset_gpio, enable); |
| 234 | else if (ts->set_reset) |
| 235 | ts->set_reset(enable); |
| 236 | } |
| 237 | |
| 238 | /* must be called with ts->mutex held */ |
Michael Welling | ef3b98c | 2015-11-02 17:51:49 -0800 | [diff] [blame] | 239 | static void __tsc200x_disable(struct tsc200x *ts) |
Michael Welling | 6ac2438 | 2015-11-02 17:45:51 -0800 | [diff] [blame] | 240 | { |
Michael Welling | ef3b98c | 2015-11-02 17:51:49 -0800 | [diff] [blame] | 241 | tsc200x_stop_scan(ts); |
Michael Welling | 6ac2438 | 2015-11-02 17:45:51 -0800 | [diff] [blame] | 242 | |
| 243 | disable_irq(ts->irq); |
| 244 | del_timer_sync(&ts->penup_timer); |
| 245 | |
| 246 | cancel_delayed_work_sync(&ts->esd_work); |
| 247 | |
| 248 | enable_irq(ts->irq); |
| 249 | } |
| 250 | |
| 251 | /* must be called with ts->mutex held */ |
Michael Welling | ef3b98c | 2015-11-02 17:51:49 -0800 | [diff] [blame] | 252 | static void __tsc200x_enable(struct tsc200x *ts) |
Michael Welling | 6ac2438 | 2015-11-02 17:45:51 -0800 | [diff] [blame] | 253 | { |
Michael Welling | ef3b98c | 2015-11-02 17:51:49 -0800 | [diff] [blame] | 254 | tsc200x_start_scan(ts); |
Michael Welling | 6ac2438 | 2015-11-02 17:45:51 -0800 | [diff] [blame] | 255 | |
| 256 | if (ts->esd_timeout && (ts->set_reset || ts->reset_gpio)) { |
| 257 | ts->last_valid_interrupt = jiffies; |
| 258 | schedule_delayed_work(&ts->esd_work, |
| 259 | round_jiffies_relative( |
| 260 | msecs_to_jiffies(ts->esd_timeout))); |
| 261 | } |
| 262 | } |
| 263 | |
Michael Welling | ef3b98c | 2015-11-02 17:51:49 -0800 | [diff] [blame] | 264 | static ssize_t tsc200x_selftest_show(struct device *dev, |
Michael Welling | 6ac2438 | 2015-11-02 17:45:51 -0800 | [diff] [blame] | 265 | struct device_attribute *attr, |
| 266 | char *buf) |
| 267 | { |
Michael Welling | ef3b98c | 2015-11-02 17:51:49 -0800 | [diff] [blame] | 268 | struct tsc200x *ts = dev_get_drvdata(dev); |
Michael Welling | 6ac2438 | 2015-11-02 17:45:51 -0800 | [diff] [blame] | 269 | unsigned int temp_high; |
| 270 | unsigned int temp_high_orig; |
| 271 | unsigned int temp_high_test; |
| 272 | bool success = true; |
| 273 | int error; |
| 274 | |
| 275 | mutex_lock(&ts->mutex); |
| 276 | |
| 277 | /* |
Michael Welling | ef3b98c | 2015-11-02 17:51:49 -0800 | [diff] [blame] | 278 | * Test TSC200X communications via temp high register. |
Michael Welling | 6ac2438 | 2015-11-02 17:45:51 -0800 | [diff] [blame] | 279 | */ |
Michael Welling | ef3b98c | 2015-11-02 17:51:49 -0800 | [diff] [blame] | 280 | __tsc200x_disable(ts); |
Michael Welling | 6ac2438 | 2015-11-02 17:45:51 -0800 | [diff] [blame] | 281 | |
Michael Welling | ef3b98c | 2015-11-02 17:51:49 -0800 | [diff] [blame] | 282 | error = regmap_read(ts->regmap, TSC200X_REG_TEMP_HIGH, &temp_high_orig); |
Michael Welling | 6ac2438 | 2015-11-02 17:45:51 -0800 | [diff] [blame] | 283 | if (error) { |
| 284 | dev_warn(dev, "selftest failed: read error %d\n", error); |
| 285 | success = false; |
| 286 | goto out; |
| 287 | } |
| 288 | |
| 289 | temp_high_test = (temp_high_orig - 1) & MAX_12BIT; |
| 290 | |
Michael Welling | ef3b98c | 2015-11-02 17:51:49 -0800 | [diff] [blame] | 291 | error = regmap_write(ts->regmap, TSC200X_REG_TEMP_HIGH, temp_high_test); |
Michael Welling | 6ac2438 | 2015-11-02 17:45:51 -0800 | [diff] [blame] | 292 | if (error) { |
| 293 | dev_warn(dev, "selftest failed: write error %d\n", error); |
| 294 | success = false; |
| 295 | goto out; |
| 296 | } |
| 297 | |
Michael Welling | ef3b98c | 2015-11-02 17:51:49 -0800 | [diff] [blame] | 298 | error = regmap_read(ts->regmap, TSC200X_REG_TEMP_HIGH, &temp_high); |
Michael Welling | 6ac2438 | 2015-11-02 17:45:51 -0800 | [diff] [blame] | 299 | if (error) { |
| 300 | dev_warn(dev, "selftest failed: read error %d after write\n", |
| 301 | error); |
| 302 | success = false; |
| 303 | goto out; |
| 304 | } |
| 305 | |
| 306 | if (temp_high != temp_high_test) { |
| 307 | dev_warn(dev, "selftest failed: %d != %d\n", |
| 308 | temp_high, temp_high_test); |
| 309 | success = false; |
| 310 | } |
| 311 | |
| 312 | /* hardware reset */ |
Michael Welling | ef3b98c | 2015-11-02 17:51:49 -0800 | [diff] [blame] | 313 | tsc200x_set_reset(ts, false); |
Michael Welling | 6ac2438 | 2015-11-02 17:45:51 -0800 | [diff] [blame] | 314 | usleep_range(100, 500); /* only 10us required */ |
Michael Welling | ef3b98c | 2015-11-02 17:51:49 -0800 | [diff] [blame] | 315 | tsc200x_set_reset(ts, true); |
Michael Welling | 6ac2438 | 2015-11-02 17:45:51 -0800 | [diff] [blame] | 316 | |
| 317 | if (!success) |
| 318 | goto out; |
| 319 | |
| 320 | /* test that the reset really happened */ |
Michael Welling | ef3b98c | 2015-11-02 17:51:49 -0800 | [diff] [blame] | 321 | error = regmap_read(ts->regmap, TSC200X_REG_TEMP_HIGH, &temp_high); |
Michael Welling | 6ac2438 | 2015-11-02 17:45:51 -0800 | [diff] [blame] | 322 | if (error) { |
| 323 | dev_warn(dev, "selftest failed: read error %d after reset\n", |
| 324 | error); |
| 325 | success = false; |
| 326 | goto out; |
| 327 | } |
| 328 | |
| 329 | if (temp_high != temp_high_orig) { |
| 330 | dev_warn(dev, "selftest failed after reset: %d != %d\n", |
| 331 | temp_high, temp_high_orig); |
| 332 | success = false; |
| 333 | } |
| 334 | |
| 335 | out: |
Michael Welling | ef3b98c | 2015-11-02 17:51:49 -0800 | [diff] [blame] | 336 | __tsc200x_enable(ts); |
Michael Welling | 6ac2438 | 2015-11-02 17:45:51 -0800 | [diff] [blame] | 337 | mutex_unlock(&ts->mutex); |
| 338 | |
| 339 | return sprintf(buf, "%d\n", success); |
| 340 | } |
| 341 | |
Michael Welling | ef3b98c | 2015-11-02 17:51:49 -0800 | [diff] [blame] | 342 | static DEVICE_ATTR(selftest, S_IRUGO, tsc200x_selftest_show, NULL); |
Michael Welling | 6ac2438 | 2015-11-02 17:45:51 -0800 | [diff] [blame] | 343 | |
Michael Welling | ef3b98c | 2015-11-02 17:51:49 -0800 | [diff] [blame] | 344 | static struct attribute *tsc200x_attrs[] = { |
Michael Welling | 6ac2438 | 2015-11-02 17:45:51 -0800 | [diff] [blame] | 345 | &dev_attr_selftest.attr, |
| 346 | NULL |
| 347 | }; |
| 348 | |
Michael Welling | ef3b98c | 2015-11-02 17:51:49 -0800 | [diff] [blame] | 349 | static umode_t tsc200x_attr_is_visible(struct kobject *kobj, |
Michael Welling | 6ac2438 | 2015-11-02 17:45:51 -0800 | [diff] [blame] | 350 | struct attribute *attr, int n) |
| 351 | { |
| 352 | struct device *dev = container_of(kobj, struct device, kobj); |
Michael Welling | ef3b98c | 2015-11-02 17:51:49 -0800 | [diff] [blame] | 353 | struct tsc200x *ts = dev_get_drvdata(dev); |
Michael Welling | 6ac2438 | 2015-11-02 17:45:51 -0800 | [diff] [blame] | 354 | umode_t mode = attr->mode; |
| 355 | |
| 356 | if (attr == &dev_attr_selftest.attr) { |
| 357 | if (!ts->set_reset && !ts->reset_gpio) |
| 358 | mode = 0; |
| 359 | } |
| 360 | |
| 361 | return mode; |
| 362 | } |
| 363 | |
Michael Welling | ef3b98c | 2015-11-02 17:51:49 -0800 | [diff] [blame] | 364 | static const struct attribute_group tsc200x_attr_group = { |
| 365 | .is_visible = tsc200x_attr_is_visible, |
| 366 | .attrs = tsc200x_attrs, |
Michael Welling | 6ac2438 | 2015-11-02 17:45:51 -0800 | [diff] [blame] | 367 | }; |
| 368 | |
Michael Welling | ef3b98c | 2015-11-02 17:51:49 -0800 | [diff] [blame] | 369 | static void tsc200x_esd_work(struct work_struct *work) |
Michael Welling | 6ac2438 | 2015-11-02 17:45:51 -0800 | [diff] [blame] | 370 | { |
Michael Welling | ef3b98c | 2015-11-02 17:51:49 -0800 | [diff] [blame] | 371 | struct tsc200x *ts = container_of(work, struct tsc200x, esd_work.work); |
Michael Welling | 6ac2438 | 2015-11-02 17:45:51 -0800 | [diff] [blame] | 372 | int error; |
| 373 | unsigned int r; |
| 374 | |
| 375 | if (!mutex_trylock(&ts->mutex)) { |
| 376 | /* |
| 377 | * If the mutex is taken, it means that disable or enable is in |
| 378 | * progress. In that case just reschedule the work. If the work |
| 379 | * is not needed, it will be canceled by disable. |
| 380 | */ |
| 381 | goto reschedule; |
| 382 | } |
| 383 | |
| 384 | if (time_is_after_jiffies(ts->last_valid_interrupt + |
| 385 | msecs_to_jiffies(ts->esd_timeout))) |
| 386 | goto out; |
| 387 | |
| 388 | /* We should be able to read register without disabling interrupts. */ |
Michael Welling | ef3b98c | 2015-11-02 17:51:49 -0800 | [diff] [blame] | 389 | error = regmap_read(ts->regmap, TSC200X_REG_CFR0, &r); |
Michael Welling | 6ac2438 | 2015-11-02 17:45:51 -0800 | [diff] [blame] | 390 | if (!error && |
Michael Welling | ef3b98c | 2015-11-02 17:51:49 -0800 | [diff] [blame] | 391 | !((r ^ TSC200X_CFR0_INITVALUE) & TSC200X_CFR0_RW_MASK)) { |
Michael Welling | 6ac2438 | 2015-11-02 17:45:51 -0800 | [diff] [blame] | 392 | goto out; |
| 393 | } |
| 394 | |
| 395 | /* |
| 396 | * If we could not read our known value from configuration register 0 |
| 397 | * then we should reset the controller as if from power-up and start |
| 398 | * scanning again. |
| 399 | */ |
Michael Welling | ef3b98c | 2015-11-02 17:51:49 -0800 | [diff] [blame] | 400 | dev_info(ts->dev, "TSC200X not responding - resetting\n"); |
Michael Welling | 6ac2438 | 2015-11-02 17:45:51 -0800 | [diff] [blame] | 401 | |
| 402 | disable_irq(ts->irq); |
| 403 | del_timer_sync(&ts->penup_timer); |
| 404 | |
Michael Welling | ef3b98c | 2015-11-02 17:51:49 -0800 | [diff] [blame] | 405 | tsc200x_update_pen_state(ts, 0, 0, 0); |
Michael Welling | 6ac2438 | 2015-11-02 17:45:51 -0800 | [diff] [blame] | 406 | |
Michael Welling | ef3b98c | 2015-11-02 17:51:49 -0800 | [diff] [blame] | 407 | tsc200x_set_reset(ts, false); |
Michael Welling | 6ac2438 | 2015-11-02 17:45:51 -0800 | [diff] [blame] | 408 | usleep_range(100, 500); /* only 10us required */ |
Michael Welling | ef3b98c | 2015-11-02 17:51:49 -0800 | [diff] [blame] | 409 | tsc200x_set_reset(ts, true); |
Michael Welling | 6ac2438 | 2015-11-02 17:45:51 -0800 | [diff] [blame] | 410 | |
| 411 | enable_irq(ts->irq); |
Michael Welling | ef3b98c | 2015-11-02 17:51:49 -0800 | [diff] [blame] | 412 | tsc200x_start_scan(ts); |
Michael Welling | 6ac2438 | 2015-11-02 17:45:51 -0800 | [diff] [blame] | 413 | |
| 414 | out: |
| 415 | mutex_unlock(&ts->mutex); |
| 416 | reschedule: |
| 417 | /* re-arm the watchdog */ |
| 418 | schedule_delayed_work(&ts->esd_work, |
| 419 | round_jiffies_relative( |
| 420 | msecs_to_jiffies(ts->esd_timeout))); |
| 421 | } |
| 422 | |
Michael Welling | ef3b98c | 2015-11-02 17:51:49 -0800 | [diff] [blame] | 423 | static int tsc200x_open(struct input_dev *input) |
Michael Welling | 6ac2438 | 2015-11-02 17:45:51 -0800 | [diff] [blame] | 424 | { |
Michael Welling | ef3b98c | 2015-11-02 17:51:49 -0800 | [diff] [blame] | 425 | struct tsc200x *ts = input_get_drvdata(input); |
Michael Welling | 6ac2438 | 2015-11-02 17:45:51 -0800 | [diff] [blame] | 426 | |
| 427 | mutex_lock(&ts->mutex); |
| 428 | |
| 429 | if (!ts->suspended) |
Michael Welling | ef3b98c | 2015-11-02 17:51:49 -0800 | [diff] [blame] | 430 | __tsc200x_enable(ts); |
Michael Welling | 6ac2438 | 2015-11-02 17:45:51 -0800 | [diff] [blame] | 431 | |
| 432 | ts->opened = true; |
| 433 | |
| 434 | mutex_unlock(&ts->mutex); |
| 435 | |
| 436 | return 0; |
| 437 | } |
| 438 | |
Michael Welling | ef3b98c | 2015-11-02 17:51:49 -0800 | [diff] [blame] | 439 | static void tsc200x_close(struct input_dev *input) |
Michael Welling | 6ac2438 | 2015-11-02 17:45:51 -0800 | [diff] [blame] | 440 | { |
Michael Welling | ef3b98c | 2015-11-02 17:51:49 -0800 | [diff] [blame] | 441 | struct tsc200x *ts = input_get_drvdata(input); |
Michael Welling | 6ac2438 | 2015-11-02 17:45:51 -0800 | [diff] [blame] | 442 | |
| 443 | mutex_lock(&ts->mutex); |
| 444 | |
| 445 | if (!ts->suspended) |
Michael Welling | ef3b98c | 2015-11-02 17:51:49 -0800 | [diff] [blame] | 446 | __tsc200x_disable(ts); |
Michael Welling | 6ac2438 | 2015-11-02 17:45:51 -0800 | [diff] [blame] | 447 | |
| 448 | ts->opened = false; |
| 449 | |
| 450 | mutex_unlock(&ts->mutex); |
| 451 | } |
| 452 | |
| 453 | int tsc200x_probe(struct device *dev, int irq, __u16 bustype, |
| 454 | struct regmap *regmap, |
| 455 | int (*tsc200x_cmd)(struct device *dev, u8 cmd)) |
| 456 | { |
| 457 | const struct tsc2005_platform_data *pdata = dev_get_platdata(dev); |
| 458 | struct device_node *np = dev->of_node; |
| 459 | |
Michael Welling | ef3b98c | 2015-11-02 17:51:49 -0800 | [diff] [blame] | 460 | struct tsc200x *ts; |
Michael Welling | 6ac2438 | 2015-11-02 17:45:51 -0800 | [diff] [blame] | 461 | struct input_dev *input_dev; |
| 462 | unsigned int max_x = MAX_12BIT; |
| 463 | unsigned int max_y = MAX_12BIT; |
| 464 | unsigned int max_p = MAX_12BIT; |
Michael Welling | ef3b98c | 2015-11-02 17:51:49 -0800 | [diff] [blame] | 465 | unsigned int fudge_x = TSC200X_DEF_X_FUZZ; |
| 466 | unsigned int fudge_y = TSC200X_DEF_Y_FUZZ; |
| 467 | unsigned int fudge_p = TSC200X_DEF_P_FUZZ; |
| 468 | unsigned int x_plate_ohm = TSC200X_DEF_RESISTOR; |
Michael Welling | 6ac2438 | 2015-11-02 17:45:51 -0800 | [diff] [blame] | 469 | unsigned int esd_timeout; |
| 470 | int error; |
| 471 | |
| 472 | if (!np && !pdata) { |
| 473 | dev_err(dev, "no platform data\n"); |
| 474 | return -ENODEV; |
| 475 | } |
| 476 | |
| 477 | if (irq <= 0) { |
| 478 | dev_err(dev, "no irq\n"); |
| 479 | return -ENODEV; |
| 480 | } |
| 481 | |
| 482 | if (IS_ERR(regmap)) |
| 483 | return PTR_ERR(regmap); |
| 484 | |
| 485 | if (!tsc200x_cmd) { |
| 486 | dev_err(dev, "no cmd function\n"); |
| 487 | return -ENODEV; |
| 488 | } |
| 489 | |
| 490 | if (pdata) { |
| 491 | fudge_x = pdata->ts_x_fudge; |
| 492 | fudge_y = pdata->ts_y_fudge; |
| 493 | fudge_p = pdata->ts_pressure_fudge; |
| 494 | max_x = pdata->ts_x_max; |
| 495 | max_y = pdata->ts_y_max; |
| 496 | max_p = pdata->ts_pressure_max; |
| 497 | x_plate_ohm = pdata->ts_x_plate_ohm; |
| 498 | esd_timeout = pdata->esd_timeout_ms; |
| 499 | } else { |
Michael Welling | ef3b98c | 2015-11-02 17:51:49 -0800 | [diff] [blame] | 500 | x_plate_ohm = TSC200X_DEF_RESISTOR; |
Michael Welling | 6ac2438 | 2015-11-02 17:45:51 -0800 | [diff] [blame] | 501 | of_property_read_u32(np, "ti,x-plate-ohms", &x_plate_ohm); |
| 502 | esd_timeout = 0; |
| 503 | of_property_read_u32(np, "ti,esd-recovery-timeout-ms", |
| 504 | &esd_timeout); |
| 505 | } |
| 506 | |
| 507 | ts = devm_kzalloc(dev, sizeof(*ts), GFP_KERNEL); |
| 508 | if (!ts) |
| 509 | return -ENOMEM; |
| 510 | |
| 511 | input_dev = devm_input_allocate_device(dev); |
| 512 | if (!input_dev) |
| 513 | return -ENOMEM; |
| 514 | |
| 515 | ts->irq = irq; |
| 516 | ts->dev = dev; |
| 517 | ts->idev = input_dev; |
| 518 | ts->regmap = regmap; |
| 519 | ts->tsc200x_cmd = tsc200x_cmd; |
| 520 | ts->x_plate_ohm = x_plate_ohm; |
| 521 | ts->esd_timeout = esd_timeout; |
| 522 | |
| 523 | ts->reset_gpio = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_HIGH); |
| 524 | if (IS_ERR(ts->reset_gpio)) { |
| 525 | error = PTR_ERR(ts->reset_gpio); |
| 526 | dev_err(dev, "error acquiring reset gpio: %d\n", error); |
| 527 | return error; |
| 528 | } |
| 529 | |
| 530 | ts->vio = devm_regulator_get_optional(dev, "vio"); |
| 531 | if (IS_ERR(ts->vio)) { |
| 532 | error = PTR_ERR(ts->vio); |
| 533 | dev_err(dev, "vio regulator missing (%d)", error); |
| 534 | return error; |
| 535 | } |
| 536 | |
| 537 | if (!ts->reset_gpio && pdata) |
| 538 | ts->set_reset = pdata->set_reset; |
| 539 | |
| 540 | mutex_init(&ts->mutex); |
| 541 | |
| 542 | spin_lock_init(&ts->lock); |
Michael Welling | ef3b98c | 2015-11-02 17:51:49 -0800 | [diff] [blame] | 543 | setup_timer(&ts->penup_timer, tsc200x_penup_timer, (unsigned long)ts); |
Michael Welling | 6ac2438 | 2015-11-02 17:45:51 -0800 | [diff] [blame] | 544 | |
Michael Welling | ef3b98c | 2015-11-02 17:51:49 -0800 | [diff] [blame] | 545 | INIT_DELAYED_WORK(&ts->esd_work, tsc200x_esd_work); |
Michael Welling | 6ac2438 | 2015-11-02 17:45:51 -0800 | [diff] [blame] | 546 | |
| 547 | snprintf(ts->phys, sizeof(ts->phys), |
| 548 | "%s/input-ts", dev_name(dev)); |
| 549 | |
Michael Welling | ef3b98c | 2015-11-02 17:51:49 -0800 | [diff] [blame] | 550 | input_dev->name = "TSC200X touchscreen"; |
Michael Welling | 6ac2438 | 2015-11-02 17:45:51 -0800 | [diff] [blame] | 551 | input_dev->phys = ts->phys; |
| 552 | input_dev->id.bustype = bustype; |
| 553 | input_dev->dev.parent = dev; |
| 554 | input_dev->evbit[0] = BIT(EV_ABS) | BIT(EV_KEY); |
| 555 | input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH); |
| 556 | |
| 557 | input_set_abs_params(input_dev, ABS_X, 0, max_x, fudge_x, 0); |
| 558 | input_set_abs_params(input_dev, ABS_Y, 0, max_y, fudge_y, 0); |
| 559 | input_set_abs_params(input_dev, ABS_PRESSURE, 0, max_p, fudge_p, 0); |
| 560 | |
| 561 | if (np) |
| 562 | touchscreen_parse_properties(input_dev, false); |
| 563 | |
Michael Welling | ef3b98c | 2015-11-02 17:51:49 -0800 | [diff] [blame] | 564 | input_dev->open = tsc200x_open; |
| 565 | input_dev->close = tsc200x_close; |
Michael Welling | 6ac2438 | 2015-11-02 17:45:51 -0800 | [diff] [blame] | 566 | |
| 567 | input_set_drvdata(input_dev, ts); |
| 568 | |
| 569 | /* Ensure the touchscreen is off */ |
Michael Welling | ef3b98c | 2015-11-02 17:51:49 -0800 | [diff] [blame] | 570 | tsc200x_stop_scan(ts); |
Michael Welling | 6ac2438 | 2015-11-02 17:45:51 -0800 | [diff] [blame] | 571 | |
| 572 | error = devm_request_threaded_irq(dev, irq, NULL, |
Michael Welling | ef3b98c | 2015-11-02 17:51:49 -0800 | [diff] [blame] | 573 | tsc200x_irq_thread, |
Michael Welling | 6ac2438 | 2015-11-02 17:45:51 -0800 | [diff] [blame] | 574 | IRQF_TRIGGER_RISING | IRQF_ONESHOT, |
Michael Welling | ef3b98c | 2015-11-02 17:51:49 -0800 | [diff] [blame] | 575 | "tsc200x", ts); |
Michael Welling | 6ac2438 | 2015-11-02 17:45:51 -0800 | [diff] [blame] | 576 | if (error) { |
| 577 | dev_err(dev, "Failed to request irq, err: %d\n", error); |
| 578 | return error; |
| 579 | } |
| 580 | |
| 581 | /* enable regulator for DT */ |
| 582 | if (ts->vio) { |
| 583 | error = regulator_enable(ts->vio); |
| 584 | if (error) |
| 585 | return error; |
| 586 | } |
| 587 | |
| 588 | dev_set_drvdata(dev, ts); |
Michael Welling | ef3b98c | 2015-11-02 17:51:49 -0800 | [diff] [blame] | 589 | error = sysfs_create_group(&dev->kobj, &tsc200x_attr_group); |
Michael Welling | 6ac2438 | 2015-11-02 17:45:51 -0800 | [diff] [blame] | 590 | if (error) { |
| 591 | dev_err(dev, |
| 592 | "Failed to create sysfs attributes, err: %d\n", error); |
| 593 | goto disable_regulator; |
| 594 | } |
| 595 | |
| 596 | error = input_register_device(ts->idev); |
| 597 | if (error) { |
| 598 | dev_err(dev, |
| 599 | "Failed to register input device, err: %d\n", error); |
| 600 | goto err_remove_sysfs; |
| 601 | } |
| 602 | |
| 603 | irq_set_irq_wake(irq, 1); |
| 604 | return 0; |
| 605 | |
| 606 | err_remove_sysfs: |
Michael Welling | ef3b98c | 2015-11-02 17:51:49 -0800 | [diff] [blame] | 607 | sysfs_remove_group(&dev->kobj, &tsc200x_attr_group); |
Michael Welling | 6ac2438 | 2015-11-02 17:45:51 -0800 | [diff] [blame] | 608 | disable_regulator: |
| 609 | if (ts->vio) |
| 610 | regulator_disable(ts->vio); |
| 611 | return error; |
| 612 | } |
| 613 | EXPORT_SYMBOL_GPL(tsc200x_probe); |
| 614 | |
| 615 | int tsc200x_remove(struct device *dev) |
| 616 | { |
Michael Welling | ef3b98c | 2015-11-02 17:51:49 -0800 | [diff] [blame] | 617 | struct tsc200x *ts = dev_get_drvdata(dev); |
Michael Welling | 6ac2438 | 2015-11-02 17:45:51 -0800 | [diff] [blame] | 618 | |
Michael Welling | ef3b98c | 2015-11-02 17:51:49 -0800 | [diff] [blame] | 619 | sysfs_remove_group(&dev->kobj, &tsc200x_attr_group); |
Michael Welling | 6ac2438 | 2015-11-02 17:45:51 -0800 | [diff] [blame] | 620 | |
| 621 | if (ts->vio) |
| 622 | regulator_disable(ts->vio); |
| 623 | |
| 624 | return 0; |
| 625 | } |
| 626 | EXPORT_SYMBOL_GPL(tsc200x_remove); |
| 627 | |
Michael Welling | ef3b98c | 2015-11-02 17:51:49 -0800 | [diff] [blame] | 628 | static int __maybe_unused tsc200x_suspend(struct device *dev) |
Michael Welling | 6ac2438 | 2015-11-02 17:45:51 -0800 | [diff] [blame] | 629 | { |
Michael Welling | ef3b98c | 2015-11-02 17:51:49 -0800 | [diff] [blame] | 630 | struct tsc200x *ts = dev_get_drvdata(dev); |
Michael Welling | 6ac2438 | 2015-11-02 17:45:51 -0800 | [diff] [blame] | 631 | |
| 632 | mutex_lock(&ts->mutex); |
| 633 | |
| 634 | if (!ts->suspended && ts->opened) |
Michael Welling | ef3b98c | 2015-11-02 17:51:49 -0800 | [diff] [blame] | 635 | __tsc200x_disable(ts); |
Michael Welling | 6ac2438 | 2015-11-02 17:45:51 -0800 | [diff] [blame] | 636 | |
| 637 | ts->suspended = true; |
| 638 | |
| 639 | mutex_unlock(&ts->mutex); |
| 640 | |
| 641 | return 0; |
| 642 | } |
| 643 | |
Michael Welling | ef3b98c | 2015-11-02 17:51:49 -0800 | [diff] [blame] | 644 | static int __maybe_unused tsc200x_resume(struct device *dev) |
Michael Welling | 6ac2438 | 2015-11-02 17:45:51 -0800 | [diff] [blame] | 645 | { |
Michael Welling | ef3b98c | 2015-11-02 17:51:49 -0800 | [diff] [blame] | 646 | struct tsc200x *ts = dev_get_drvdata(dev); |
Michael Welling | 6ac2438 | 2015-11-02 17:45:51 -0800 | [diff] [blame] | 647 | |
| 648 | mutex_lock(&ts->mutex); |
| 649 | |
| 650 | if (ts->suspended && ts->opened) |
Michael Welling | ef3b98c | 2015-11-02 17:51:49 -0800 | [diff] [blame] | 651 | __tsc200x_enable(ts); |
Michael Welling | 6ac2438 | 2015-11-02 17:45:51 -0800 | [diff] [blame] | 652 | |
| 653 | ts->suspended = false; |
| 654 | |
| 655 | mutex_unlock(&ts->mutex); |
| 656 | |
| 657 | return 0; |
| 658 | } |
| 659 | |
Michael Welling | ef3b98c | 2015-11-02 17:51:49 -0800 | [diff] [blame] | 660 | SIMPLE_DEV_PM_OPS(tsc200x_pm_ops, tsc200x_suspend, tsc200x_resume); |
Michael Welling | 6ac2438 | 2015-11-02 17:45:51 -0800 | [diff] [blame] | 661 | EXPORT_SYMBOL_GPL(tsc200x_pm_ops); |
| 662 | |
| 663 | MODULE_AUTHOR("Lauri Leukkunen <lauri.leukkunen@nokia.com>"); |
Michael Welling | ef3b98c | 2015-11-02 17:51:49 -0800 | [diff] [blame] | 664 | MODULE_DESCRIPTION("TSC200x Touchscreen Driver Core"); |
Michael Welling | 6ac2438 | 2015-11-02 17:45:51 -0800 | [diff] [blame] | 665 | MODULE_LICENSE("GPL"); |