Todd Fischer | 7525996 | 2010-04-05 17:53:12 -0600 | [diff] [blame] | 1 | /* |
Todd Fischer | 7525996 | 2010-04-05 17:53:12 -0600 | [diff] [blame] | 2 | * Touchscreen driver for the tps6507x chip. |
| 3 | * |
| 4 | * Copyright (c) 2009 RidgeRun (todd.fischer@ridgerun.com) |
| 5 | * |
| 6 | * Credits: |
| 7 | * |
| 8 | * Using code from tsc2007, MtekVision Co., Ltd. |
| 9 | * |
| 10 | * For licencing details see kernel-base/COPYING |
| 11 | * |
| 12 | * TPS65070, TPS65073, TPS650731, and TPS650732 support |
| 13 | * 10 bit touch screen interface. |
| 14 | */ |
| 15 | |
| 16 | #include <linux/module.h> |
| 17 | #include <linux/workqueue.h> |
| 18 | #include <linux/slab.h> |
| 19 | #include <linux/input.h> |
| 20 | #include <linux/platform_device.h> |
| 21 | #include <linux/mfd/tps6507x.h> |
| 22 | #include <linux/input/tps6507x-ts.h> |
| 23 | #include <linux/delay.h> |
| 24 | |
| 25 | #define TSC_DEFAULT_POLL_PERIOD 30 /* ms */ |
| 26 | #define TPS_DEFAULT_MIN_PRESSURE 0x30 |
| 27 | #define MAX_10BIT ((1 << 10) - 1) |
| 28 | |
| 29 | #define TPS6507X_ADCONFIG_CONVERT_TS (TPS6507X_ADCONFIG_AD_ENABLE | \ |
| 30 | TPS6507X_ADCONFIG_START_CONVERSION | \ |
| 31 | TPS6507X_ADCONFIG_INPUT_REAL_TSC) |
| 32 | #define TPS6507X_ADCONFIG_POWER_DOWN_TS (TPS6507X_ADCONFIG_INPUT_REAL_TSC) |
| 33 | |
| 34 | struct ts_event { |
| 35 | u16 x; |
| 36 | u16 y; |
| 37 | u16 pressure; |
| 38 | }; |
| 39 | |
| 40 | struct tps6507x_ts { |
| 41 | struct input_dev *input_dev; |
| 42 | struct device *dev; |
| 43 | char phys[32]; |
Todd Fischer | 7525996 | 2010-04-05 17:53:12 -0600 | [diff] [blame] | 44 | struct delayed_work work; |
Todd Fischer | 7525996 | 2010-04-05 17:53:12 -0600 | [diff] [blame] | 45 | struct ts_event tc; |
| 46 | struct tps6507x_dev *mfd; |
| 47 | u16 model; |
Dmitry Torokhov | 02a7160 | 2013-04-15 11:01:21 -0700 | [diff] [blame^] | 48 | u16 min_pressure; |
Todd Fischer | 7525996 | 2010-04-05 17:53:12 -0600 | [diff] [blame] | 49 | int irq; |
| 50 | void (*clear_penirq)(void); |
| 51 | unsigned long poll_period; /* ms */ |
Todd Fischer | 7525996 | 2010-04-05 17:53:12 -0600 | [diff] [blame] | 52 | int vref; /* non-zero to leave vref on */ |
Dmitry Torokhov | 02a7160 | 2013-04-15 11:01:21 -0700 | [diff] [blame^] | 53 | bool pendown; |
Todd Fischer | 7525996 | 2010-04-05 17:53:12 -0600 | [diff] [blame] | 54 | }; |
| 55 | |
| 56 | static int tps6507x_read_u8(struct tps6507x_ts *tsc, u8 reg, u8 *data) |
| 57 | { |
| 58 | int err; |
| 59 | |
| 60 | err = tsc->mfd->read_dev(tsc->mfd, reg, 1, data); |
| 61 | |
| 62 | if (err) |
| 63 | return err; |
| 64 | |
| 65 | return 0; |
| 66 | } |
| 67 | |
| 68 | static int tps6507x_write_u8(struct tps6507x_ts *tsc, u8 reg, u8 data) |
| 69 | { |
| 70 | return tsc->mfd->write_dev(tsc->mfd, reg, 1, &data); |
| 71 | } |
| 72 | |
| 73 | static s32 tps6507x_adc_conversion(struct tps6507x_ts *tsc, |
| 74 | u8 tsc_mode, u16 *value) |
| 75 | { |
| 76 | s32 ret; |
| 77 | u8 adc_status; |
| 78 | u8 result; |
| 79 | |
| 80 | /* Route input signal to A/D converter */ |
| 81 | |
| 82 | ret = tps6507x_write_u8(tsc, TPS6507X_REG_TSCMODE, tsc_mode); |
| 83 | if (ret) { |
| 84 | dev_err(tsc->dev, "TSC mode read failed\n"); |
| 85 | goto err; |
| 86 | } |
| 87 | |
| 88 | /* Start A/D conversion */ |
| 89 | |
| 90 | ret = tps6507x_write_u8(tsc, TPS6507X_REG_ADCONFIG, |
| 91 | TPS6507X_ADCONFIG_CONVERT_TS); |
| 92 | if (ret) { |
| 93 | dev_err(tsc->dev, "ADC config write failed\n"); |
| 94 | return ret; |
| 95 | } |
| 96 | |
| 97 | do { |
| 98 | ret = tps6507x_read_u8(tsc, TPS6507X_REG_ADCONFIG, |
| 99 | &adc_status); |
| 100 | if (ret) { |
| 101 | dev_err(tsc->dev, "ADC config read failed\n"); |
| 102 | goto err; |
| 103 | } |
| 104 | } while (adc_status & TPS6507X_ADCONFIG_START_CONVERSION); |
| 105 | |
| 106 | ret = tps6507x_read_u8(tsc, TPS6507X_REG_ADRESULT_2, &result); |
| 107 | if (ret) { |
| 108 | dev_err(tsc->dev, "ADC result 2 read failed\n"); |
| 109 | goto err; |
| 110 | } |
| 111 | |
| 112 | *value = (result & TPS6507X_REG_ADRESULT_2_MASK) << 8; |
| 113 | |
| 114 | ret = tps6507x_read_u8(tsc, TPS6507X_REG_ADRESULT_1, &result); |
| 115 | if (ret) { |
| 116 | dev_err(tsc->dev, "ADC result 1 read failed\n"); |
| 117 | goto err; |
| 118 | } |
| 119 | |
| 120 | *value |= result; |
| 121 | |
| 122 | dev_dbg(tsc->dev, "TSC channel %d = 0x%X\n", tsc_mode, *value); |
| 123 | |
| 124 | err: |
| 125 | return ret; |
| 126 | } |
| 127 | |
| 128 | /* Need to call tps6507x_adc_standby() after using A/D converter for the |
| 129 | * touch screen interrupt to work properly. |
| 130 | */ |
| 131 | |
| 132 | static s32 tps6507x_adc_standby(struct tps6507x_ts *tsc) |
| 133 | { |
| 134 | s32 ret; |
| 135 | s32 loops = 0; |
| 136 | u8 val; |
| 137 | |
| 138 | ret = tps6507x_write_u8(tsc, TPS6507X_REG_ADCONFIG, |
| 139 | TPS6507X_ADCONFIG_INPUT_TSC); |
| 140 | if (ret) |
| 141 | return ret; |
| 142 | |
| 143 | ret = tps6507x_write_u8(tsc, TPS6507X_REG_TSCMODE, |
| 144 | TPS6507X_TSCMODE_STANDBY); |
| 145 | if (ret) |
| 146 | return ret; |
| 147 | |
| 148 | ret = tps6507x_read_u8(tsc, TPS6507X_REG_INT, &val); |
| 149 | if (ret) |
| 150 | return ret; |
| 151 | |
| 152 | while (val & TPS6507X_REG_TSC_INT) { |
| 153 | mdelay(10); |
| 154 | ret = tps6507x_read_u8(tsc, TPS6507X_REG_INT, &val); |
| 155 | if (ret) |
| 156 | return ret; |
| 157 | loops++; |
| 158 | } |
| 159 | |
| 160 | return ret; |
| 161 | } |
| 162 | |
| 163 | static void tps6507x_ts_handler(struct work_struct *work) |
| 164 | { |
| 165 | struct tps6507x_ts *tsc = container_of(work, |
| 166 | struct tps6507x_ts, work.work); |
| 167 | struct input_dev *input_dev = tsc->input_dev; |
Dmitry Torokhov | 02a7160 | 2013-04-15 11:01:21 -0700 | [diff] [blame^] | 168 | bool pendown; |
Todd Fischer | 7525996 | 2010-04-05 17:53:12 -0600 | [diff] [blame] | 169 | int schd; |
Todd Fischer | 7525996 | 2010-04-05 17:53:12 -0600 | [diff] [blame] | 170 | s32 ret; |
| 171 | |
Dmitry Torokhov | 02a7160 | 2013-04-15 11:01:21 -0700 | [diff] [blame^] | 172 | ret = tps6507x_adc_conversion(tsc, TPS6507X_TSCMODE_PRESSURE, |
| 173 | &tsc->tc.pressure); |
Todd Fischer | 7525996 | 2010-04-05 17:53:12 -0600 | [diff] [blame] | 174 | if (ret) |
| 175 | goto done; |
| 176 | |
| 177 | pendown = tsc->tc.pressure > tsc->min_pressure; |
| 178 | |
| 179 | if (unlikely(!pendown && tsc->pendown)) { |
| 180 | dev_dbg(tsc->dev, "UP\n"); |
| 181 | input_report_key(input_dev, BTN_TOUCH, 0); |
| 182 | input_report_abs(input_dev, ABS_PRESSURE, 0); |
| 183 | input_sync(input_dev); |
Dmitry Torokhov | 02a7160 | 2013-04-15 11:01:21 -0700 | [diff] [blame^] | 184 | tsc->pendown = false; |
Todd Fischer | 7525996 | 2010-04-05 17:53:12 -0600 | [diff] [blame] | 185 | } |
| 186 | |
| 187 | if (pendown) { |
| 188 | |
| 189 | if (!tsc->pendown) { |
| 190 | dev_dbg(tsc->dev, "DOWN\n"); |
| 191 | input_report_key(input_dev, BTN_TOUCH, 1); |
| 192 | } else |
| 193 | dev_dbg(tsc->dev, "still down\n"); |
| 194 | |
| 195 | ret = tps6507x_adc_conversion(tsc, TPS6507X_TSCMODE_X_POSITION, |
| 196 | &tsc->tc.x); |
| 197 | if (ret) |
| 198 | goto done; |
| 199 | |
| 200 | ret = tps6507x_adc_conversion(tsc, TPS6507X_TSCMODE_Y_POSITION, |
| 201 | &tsc->tc.y); |
| 202 | if (ret) |
| 203 | goto done; |
| 204 | |
| 205 | input_report_abs(input_dev, ABS_X, tsc->tc.x); |
| 206 | input_report_abs(input_dev, ABS_Y, tsc->tc.y); |
| 207 | input_report_abs(input_dev, ABS_PRESSURE, tsc->tc.pressure); |
| 208 | input_sync(input_dev); |
Dmitry Torokhov | 02a7160 | 2013-04-15 11:01:21 -0700 | [diff] [blame^] | 209 | tsc->pendown = true; |
Todd Fischer | 7525996 | 2010-04-05 17:53:12 -0600 | [diff] [blame] | 210 | } |
| 211 | |
| 212 | done: |
| 213 | /* always poll if not using interrupts */ |
Alan Cox | 04848ba | 2012-11-03 12:16:12 -0700 | [diff] [blame] | 214 | schd = schedule_delayed_work(&tsc->work, |
| 215 | msecs_to_jiffies(tsc->poll_period)); |
| 216 | if (!schd) |
| 217 | dev_err(tsc->dev, "re-schedule failed"); |
Todd Fischer | 7525996 | 2010-04-05 17:53:12 -0600 | [diff] [blame] | 218 | |
| 219 | ret = tps6507x_adc_standby(tsc); |
| 220 | } |
| 221 | |
| 222 | static int tps6507x_ts_probe(struct platform_device *pdev) |
| 223 | { |
| 224 | int error; |
| 225 | struct tps6507x_ts *tsc; |
| 226 | struct tps6507x_dev *tps6507x_dev = dev_get_drvdata(pdev->dev.parent); |
| 227 | struct touchscreen_init_data *init_data; |
| 228 | struct input_dev *input_dev; |
| 229 | struct tps6507x_board *tps_board; |
| 230 | int schd; |
| 231 | |
| 232 | /** |
| 233 | * tps_board points to pmic related constants |
| 234 | * coming from the board-evm file. |
| 235 | */ |
| 236 | |
| 237 | tps_board = (struct tps6507x_board *)tps6507x_dev->dev->platform_data; |
| 238 | |
| 239 | if (!tps_board) { |
| 240 | dev_err(tps6507x_dev->dev, |
| 241 | "Could not find tps6507x platform data\n"); |
| 242 | return -EIO; |
| 243 | } |
| 244 | |
| 245 | /** |
| 246 | * init_data points to array of regulator_init structures |
| 247 | * coming from the board-evm file. |
| 248 | */ |
| 249 | |
| 250 | init_data = tps_board->tps6507x_ts_init_data; |
| 251 | |
| 252 | tsc = kzalloc(sizeof(struct tps6507x_ts), GFP_KERNEL); |
| 253 | if (!tsc) { |
| 254 | dev_err(tps6507x_dev->dev, "failed to allocate driver data\n"); |
| 255 | error = -ENOMEM; |
| 256 | goto err0; |
| 257 | } |
| 258 | |
| 259 | tps6507x_dev->ts = tsc; |
| 260 | tsc->mfd = tps6507x_dev; |
| 261 | tsc->dev = tps6507x_dev->dev; |
| 262 | input_dev = input_allocate_device(); |
| 263 | if (!input_dev) { |
| 264 | dev_err(tsc->dev, "Failed to allocate input device.\n"); |
| 265 | error = -ENOMEM; |
| 266 | goto err1; |
| 267 | } |
| 268 | |
| 269 | input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS); |
| 270 | input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH); |
| 271 | |
| 272 | input_set_abs_params(input_dev, ABS_X, 0, MAX_10BIT, 0, 0); |
| 273 | input_set_abs_params(input_dev, ABS_Y, 0, MAX_10BIT, 0, 0); |
| 274 | input_set_abs_params(input_dev, ABS_PRESSURE, 0, MAX_10BIT, 0, 0); |
| 275 | |
| 276 | input_dev->name = "TPS6507x Touchscreen"; |
| 277 | input_dev->id.bustype = BUS_I2C; |
| 278 | input_dev->dev.parent = tsc->dev; |
| 279 | |
| 280 | snprintf(tsc->phys, sizeof(tsc->phys), |
| 281 | "%s/input0", dev_name(tsc->dev)); |
| 282 | input_dev->phys = tsc->phys; |
| 283 | |
| 284 | dev_dbg(tsc->dev, "device: %s\n", input_dev->phys); |
| 285 | |
| 286 | input_set_drvdata(input_dev, tsc); |
| 287 | |
| 288 | tsc->input_dev = input_dev; |
| 289 | |
| 290 | INIT_DELAYED_WORK(&tsc->work, tps6507x_ts_handler); |
Todd Fischer | 7525996 | 2010-04-05 17:53:12 -0600 | [diff] [blame] | 291 | |
| 292 | if (init_data) { |
| 293 | tsc->poll_period = init_data->poll_period; |
| 294 | tsc->vref = init_data->vref; |
| 295 | tsc->min_pressure = init_data->min_pressure; |
| 296 | input_dev->id.vendor = init_data->vendor; |
| 297 | input_dev->id.product = init_data->product; |
| 298 | input_dev->id.version = init_data->version; |
| 299 | } else { |
| 300 | tsc->poll_period = TSC_DEFAULT_POLL_PERIOD; |
| 301 | tsc->min_pressure = TPS_DEFAULT_MIN_PRESSURE; |
| 302 | } |
| 303 | |
| 304 | error = tps6507x_adc_standby(tsc); |
| 305 | if (error) |
| 306 | goto err2; |
| 307 | |
| 308 | error = input_register_device(input_dev); |
| 309 | if (error) |
| 310 | goto err2; |
| 311 | |
Tejun Heo | 1c1e864 | 2011-01-26 12:12:50 +0100 | [diff] [blame] | 312 | schd = schedule_delayed_work(&tsc->work, |
| 313 | msecs_to_jiffies(tsc->poll_period)); |
Todd Fischer | 7525996 | 2010-04-05 17:53:12 -0600 | [diff] [blame] | 314 | |
Alan Cox | 04848ba | 2012-11-03 12:16:12 -0700 | [diff] [blame] | 315 | if (!schd) { |
Todd Fischer | 7525996 | 2010-04-05 17:53:12 -0600 | [diff] [blame] | 316 | dev_err(tsc->dev, "schedule failed"); |
| 317 | goto err2; |
| 318 | } |
Axel Lin | 9841788 | 2010-09-02 10:26:35 -0700 | [diff] [blame] | 319 | platform_set_drvdata(pdev, tps6507x_dev); |
Todd Fischer | 7525996 | 2010-04-05 17:53:12 -0600 | [diff] [blame] | 320 | |
| 321 | return 0; |
| 322 | |
| 323 | err2: |
Dan Carpenter | f7a2e30 | 2010-06-01 21:29:40 -0700 | [diff] [blame] | 324 | cancel_delayed_work_sync(&tsc->work); |
Todd Fischer | 7525996 | 2010-04-05 17:53:12 -0600 | [diff] [blame] | 325 | input_free_device(input_dev); |
| 326 | err1: |
| 327 | kfree(tsc); |
| 328 | tps6507x_dev->ts = NULL; |
| 329 | err0: |
| 330 | return error; |
| 331 | } |
| 332 | |
Bill Pemberton | e2619cf | 2012-11-23 21:50:47 -0800 | [diff] [blame] | 333 | static int tps6507x_ts_remove(struct platform_device *pdev) |
Todd Fischer | 7525996 | 2010-04-05 17:53:12 -0600 | [diff] [blame] | 334 | { |
| 335 | struct tps6507x_dev *tps6507x_dev = platform_get_drvdata(pdev); |
| 336 | struct tps6507x_ts *tsc = tps6507x_dev->ts; |
| 337 | struct input_dev *input_dev = tsc->input_dev; |
| 338 | |
Dan Carpenter | f7a2e30 | 2010-06-01 21:29:40 -0700 | [diff] [blame] | 339 | cancel_delayed_work_sync(&tsc->work); |
Todd Fischer | 7525996 | 2010-04-05 17:53:12 -0600 | [diff] [blame] | 340 | |
Axel Lin | 8a26f5d | 2010-09-02 19:52:37 -0700 | [diff] [blame] | 341 | input_unregister_device(input_dev); |
Todd Fischer | 7525996 | 2010-04-05 17:53:12 -0600 | [diff] [blame] | 342 | |
| 343 | tps6507x_dev->ts = NULL; |
| 344 | kfree(tsc); |
| 345 | |
| 346 | return 0; |
| 347 | } |
| 348 | |
| 349 | static struct platform_driver tps6507x_ts_driver = { |
| 350 | .driver = { |
| 351 | .name = "tps6507x-ts", |
| 352 | .owner = THIS_MODULE, |
| 353 | }, |
| 354 | .probe = tps6507x_ts_probe, |
Bill Pemberton | 1cb0aa8 | 2012-11-23 21:27:39 -0800 | [diff] [blame] | 355 | .remove = tps6507x_ts_remove, |
Todd Fischer | 7525996 | 2010-04-05 17:53:12 -0600 | [diff] [blame] | 356 | }; |
JJ Ding | cdcc96e | 2011-11-29 11:14:13 -0800 | [diff] [blame] | 357 | module_platform_driver(tps6507x_ts_driver); |
Todd Fischer | 7525996 | 2010-04-05 17:53:12 -0600 | [diff] [blame] | 358 | |
| 359 | MODULE_AUTHOR("Todd Fischer <todd.fischer@ridgerun.com>"); |
| 360 | MODULE_DESCRIPTION("TPS6507x - TouchScreen driver"); |
| 361 | MODULE_LICENSE("GPL v2"); |
Uwe Kleine-König | 79026ff | 2012-04-03 09:33:58 -0700 | [diff] [blame] | 362 | MODULE_ALIAS("platform:tps6507x-ts"); |