Viresh Kumar | 2bd942f | 2012-11-09 23:56:59 -0800 | [diff] [blame] | 1 | /* |
| 2 | * STMicroelectronics STMPE811 Touchscreen Driver |
Luotao Fu | f94add3 | 2010-07-02 14:10:29 +0200 | [diff] [blame] | 3 | * |
| 4 | * (C) 2010 Luotao Fu <l.fu@pengutronix.de> |
| 5 | * All rights reserved. |
| 6 | * |
| 7 | * This program is free software; you can redistribute it and/or modify it |
| 8 | * under the terms of the GNU General Public License as published by the |
| 9 | * Free Software Foundation; either version 2 of the License, or (at your |
| 10 | * option) any later version. |
| 11 | * |
| 12 | */ |
| 13 | |
| 14 | #include <linux/kernel.h> |
| 15 | #include <linux/module.h> |
| 16 | #include <linux/sched.h> |
| 17 | #include <linux/interrupt.h> |
| 18 | #include <linux/init.h> |
| 19 | #include <linux/device.h> |
Vipul Kumar Samar | 037db52 | 2012-11-22 23:42:12 -0800 | [diff] [blame] | 20 | #include <linux/of.h> |
Luotao Fu | f94add3 | 2010-07-02 14:10:29 +0200 | [diff] [blame] | 21 | #include <linux/platform_device.h> |
| 22 | #include <linux/input.h> |
| 23 | #include <linux/slab.h> |
| 24 | #include <linux/delay.h> |
| 25 | #include <linux/i2c.h> |
| 26 | #include <linux/workqueue.h> |
| 27 | |
| 28 | #include <linux/mfd/stmpe.h> |
| 29 | |
| 30 | /* Register layouts and functionalities are identical on all stmpexxx variants |
| 31 | * with touchscreen controller |
| 32 | */ |
| 33 | #define STMPE_REG_INT_STA 0x0B |
| 34 | #define STMPE_REG_ADC_CTRL1 0x20 |
| 35 | #define STMPE_REG_ADC_CTRL2 0x21 |
| 36 | #define STMPE_REG_TSC_CTRL 0x40 |
| 37 | #define STMPE_REG_TSC_CFG 0x41 |
| 38 | #define STMPE_REG_FIFO_TH 0x4A |
| 39 | #define STMPE_REG_FIFO_STA 0x4B |
| 40 | #define STMPE_REG_FIFO_SIZE 0x4C |
| 41 | #define STMPE_REG_TSC_DATA_XYZ 0x52 |
| 42 | #define STMPE_REG_TSC_FRACTION_Z 0x56 |
| 43 | #define STMPE_REG_TSC_I_DRIVE 0x58 |
| 44 | |
| 45 | #define OP_MOD_XYZ 0 |
| 46 | |
| 47 | #define STMPE_TSC_CTRL_TSC_EN (1<<0) |
| 48 | |
| 49 | #define STMPE_FIFO_STA_RESET (1<<0) |
| 50 | |
| 51 | #define STMPE_IRQ_TOUCH_DET 0 |
| 52 | |
| 53 | #define SAMPLE_TIME(x) ((x & 0xf) << 4) |
| 54 | #define MOD_12B(x) ((x & 0x1) << 3) |
| 55 | #define REF_SEL(x) ((x & 0x1) << 1) |
| 56 | #define ADC_FREQ(x) (x & 0x3) |
| 57 | #define AVE_CTRL(x) ((x & 0x3) << 6) |
| 58 | #define DET_DELAY(x) ((x & 0x7) << 3) |
| 59 | #define SETTLING(x) (x & 0x7) |
| 60 | #define FRACTION_Z(x) (x & 0x7) |
| 61 | #define I_DRIVE(x) (x & 0x1) |
| 62 | #define OP_MODE(x) ((x & 0x7) << 1) |
| 63 | |
| 64 | #define STMPE_TS_NAME "stmpe-ts" |
| 65 | #define XY_MASK 0xfff |
| 66 | |
| 67 | struct stmpe_touch { |
| 68 | struct stmpe *stmpe; |
| 69 | struct input_dev *idev; |
| 70 | struct delayed_work work; |
| 71 | struct device *dev; |
| 72 | u8 sample_time; |
| 73 | u8 mod_12b; |
| 74 | u8 ref_sel; |
| 75 | u8 adc_freq; |
| 76 | u8 ave_ctrl; |
| 77 | u8 touch_det_delay; |
| 78 | u8 settling; |
| 79 | u8 fraction_z; |
| 80 | u8 i_drive; |
| 81 | }; |
| 82 | |
| 83 | static int __stmpe_reset_fifo(struct stmpe *stmpe) |
| 84 | { |
| 85 | int ret; |
| 86 | |
| 87 | ret = stmpe_set_bits(stmpe, STMPE_REG_FIFO_STA, |
| 88 | STMPE_FIFO_STA_RESET, STMPE_FIFO_STA_RESET); |
| 89 | if (ret) |
| 90 | return ret; |
| 91 | |
| 92 | return stmpe_set_bits(stmpe, STMPE_REG_FIFO_STA, |
| 93 | STMPE_FIFO_STA_RESET, 0); |
| 94 | } |
| 95 | |
| 96 | static void stmpe_work(struct work_struct *work) |
| 97 | { |
| 98 | int int_sta; |
| 99 | u32 timeout = 40; |
| 100 | |
| 101 | struct stmpe_touch *ts = |
| 102 | container_of(work, struct stmpe_touch, work.work); |
| 103 | |
| 104 | int_sta = stmpe_reg_read(ts->stmpe, STMPE_REG_INT_STA); |
| 105 | |
| 106 | /* |
| 107 | * touch_det sometimes get desasserted or just get stuck. This appears |
| 108 | * to be a silicon bug, We still have to clearify this with the |
| 109 | * manufacture. As a workaround We release the key anyway if the |
| 110 | * touch_det keeps coming in after 4ms, while the FIFO contains no value |
| 111 | * during the whole time. |
| 112 | */ |
| 113 | while ((int_sta & (1 << STMPE_IRQ_TOUCH_DET)) && (timeout > 0)) { |
| 114 | timeout--; |
| 115 | int_sta = stmpe_reg_read(ts->stmpe, STMPE_REG_INT_STA); |
| 116 | udelay(100); |
| 117 | } |
| 118 | |
| 119 | /* reset the FIFO before we report release event */ |
| 120 | __stmpe_reset_fifo(ts->stmpe); |
| 121 | |
| 122 | input_report_abs(ts->idev, ABS_PRESSURE, 0); |
| 123 | input_sync(ts->idev); |
| 124 | } |
| 125 | |
| 126 | static irqreturn_t stmpe_ts_handler(int irq, void *data) |
| 127 | { |
| 128 | u8 data_set[4]; |
| 129 | int x, y, z; |
| 130 | struct stmpe_touch *ts = data; |
| 131 | |
| 132 | /* |
| 133 | * Cancel scheduled polling for release if we have new value |
| 134 | * available. Wait if the polling is already running. |
| 135 | */ |
| 136 | cancel_delayed_work_sync(&ts->work); |
| 137 | |
| 138 | /* |
| 139 | * The FIFO sometimes just crashes and stops generating interrupts. This |
| 140 | * appears to be a silicon bug. We still have to clearify this with |
| 141 | * the manufacture. As a workaround we disable the TSC while we are |
| 142 | * collecting data and flush the FIFO after reading |
| 143 | */ |
| 144 | stmpe_set_bits(ts->stmpe, STMPE_REG_TSC_CTRL, |
| 145 | STMPE_TSC_CTRL_TSC_EN, 0); |
| 146 | |
| 147 | stmpe_block_read(ts->stmpe, STMPE_REG_TSC_DATA_XYZ, 4, data_set); |
| 148 | |
| 149 | x = (data_set[0] << 4) | (data_set[1] >> 4); |
| 150 | y = ((data_set[1] & 0xf) << 8) | data_set[2]; |
| 151 | z = data_set[3]; |
| 152 | |
| 153 | input_report_abs(ts->idev, ABS_X, x); |
| 154 | input_report_abs(ts->idev, ABS_Y, y); |
| 155 | input_report_abs(ts->idev, ABS_PRESSURE, z); |
| 156 | input_sync(ts->idev); |
| 157 | |
| 158 | /* flush the FIFO after we have read out our values. */ |
| 159 | __stmpe_reset_fifo(ts->stmpe); |
| 160 | |
| 161 | /* reenable the tsc */ |
| 162 | stmpe_set_bits(ts->stmpe, STMPE_REG_TSC_CTRL, |
| 163 | STMPE_TSC_CTRL_TSC_EN, STMPE_TSC_CTRL_TSC_EN); |
| 164 | |
| 165 | /* start polling for touch_det to detect release */ |
| 166 | schedule_delayed_work(&ts->work, HZ / 50); |
| 167 | |
| 168 | return IRQ_HANDLED; |
| 169 | } |
| 170 | |
| 171 | static int __devinit stmpe_init_hw(struct stmpe_touch *ts) |
| 172 | { |
| 173 | int ret; |
| 174 | u8 adc_ctrl1, adc_ctrl1_mask, tsc_cfg, tsc_cfg_mask; |
| 175 | struct stmpe *stmpe = ts->stmpe; |
| 176 | struct device *dev = ts->dev; |
| 177 | |
| 178 | ret = stmpe_enable(stmpe, STMPE_BLOCK_TOUCHSCREEN | STMPE_BLOCK_ADC); |
| 179 | if (ret) { |
| 180 | dev_err(dev, "Could not enable clock for ADC and TS\n"); |
| 181 | return ret; |
| 182 | } |
| 183 | |
| 184 | adc_ctrl1 = SAMPLE_TIME(ts->sample_time) | MOD_12B(ts->mod_12b) | |
| 185 | REF_SEL(ts->ref_sel); |
| 186 | adc_ctrl1_mask = SAMPLE_TIME(0xff) | MOD_12B(0xff) | REF_SEL(0xff); |
| 187 | |
| 188 | ret = stmpe_set_bits(stmpe, STMPE_REG_ADC_CTRL1, |
| 189 | adc_ctrl1_mask, adc_ctrl1); |
| 190 | if (ret) { |
| 191 | dev_err(dev, "Could not setup ADC\n"); |
| 192 | return ret; |
| 193 | } |
| 194 | |
| 195 | ret = stmpe_set_bits(stmpe, STMPE_REG_ADC_CTRL2, |
| 196 | ADC_FREQ(0xff), ADC_FREQ(ts->adc_freq)); |
| 197 | if (ret) { |
| 198 | dev_err(dev, "Could not setup ADC\n"); |
| 199 | return ret; |
| 200 | } |
| 201 | |
| 202 | tsc_cfg = AVE_CTRL(ts->ave_ctrl) | DET_DELAY(ts->touch_det_delay) | |
| 203 | SETTLING(ts->settling); |
| 204 | tsc_cfg_mask = AVE_CTRL(0xff) | DET_DELAY(0xff) | SETTLING(0xff); |
| 205 | |
| 206 | ret = stmpe_set_bits(stmpe, STMPE_REG_TSC_CFG, tsc_cfg_mask, tsc_cfg); |
| 207 | if (ret) { |
| 208 | dev_err(dev, "Could not config touch\n"); |
| 209 | return ret; |
| 210 | } |
| 211 | |
| 212 | ret = stmpe_set_bits(stmpe, STMPE_REG_TSC_FRACTION_Z, |
| 213 | FRACTION_Z(0xff), FRACTION_Z(ts->fraction_z)); |
| 214 | if (ret) { |
| 215 | dev_err(dev, "Could not config touch\n"); |
| 216 | return ret; |
| 217 | } |
| 218 | |
| 219 | ret = stmpe_set_bits(stmpe, STMPE_REG_TSC_I_DRIVE, |
| 220 | I_DRIVE(0xff), I_DRIVE(ts->i_drive)); |
| 221 | if (ret) { |
| 222 | dev_err(dev, "Could not config touch\n"); |
| 223 | return ret; |
| 224 | } |
| 225 | |
| 226 | /* set FIFO to 1 for single point reading */ |
| 227 | ret = stmpe_reg_write(stmpe, STMPE_REG_FIFO_TH, 1); |
| 228 | if (ret) { |
| 229 | dev_err(dev, "Could not set FIFO\n"); |
| 230 | return ret; |
| 231 | } |
| 232 | |
| 233 | ret = stmpe_set_bits(stmpe, STMPE_REG_TSC_CTRL, |
| 234 | OP_MODE(0xff), OP_MODE(OP_MOD_XYZ)); |
| 235 | if (ret) { |
| 236 | dev_err(dev, "Could not set mode\n"); |
| 237 | return ret; |
| 238 | } |
| 239 | |
| 240 | return 0; |
| 241 | } |
| 242 | |
| 243 | static int stmpe_ts_open(struct input_dev *dev) |
| 244 | { |
| 245 | struct stmpe_touch *ts = input_get_drvdata(dev); |
| 246 | int ret = 0; |
| 247 | |
| 248 | ret = __stmpe_reset_fifo(ts->stmpe); |
| 249 | if (ret) |
| 250 | return ret; |
| 251 | |
| 252 | return stmpe_set_bits(ts->stmpe, STMPE_REG_TSC_CTRL, |
| 253 | STMPE_TSC_CTRL_TSC_EN, STMPE_TSC_CTRL_TSC_EN); |
| 254 | } |
| 255 | |
| 256 | static void stmpe_ts_close(struct input_dev *dev) |
| 257 | { |
| 258 | struct stmpe_touch *ts = input_get_drvdata(dev); |
| 259 | |
| 260 | cancel_delayed_work_sync(&ts->work); |
| 261 | |
| 262 | stmpe_set_bits(ts->stmpe, STMPE_REG_TSC_CTRL, |
| 263 | STMPE_TSC_CTRL_TSC_EN, 0); |
| 264 | } |
| 265 | |
Vipul Kumar Samar | 037db52 | 2012-11-22 23:42:12 -0800 | [diff] [blame] | 266 | static void stmpe_ts_get_platform_info(struct platform_device *pdev, |
| 267 | struct stmpe_touch *ts) |
Luotao Fu | f94add3 | 2010-07-02 14:10:29 +0200 | [diff] [blame] | 268 | { |
| 269 | struct stmpe *stmpe = dev_get_drvdata(pdev->dev.parent); |
Vipul Kumar Samar | 037db52 | 2012-11-22 23:42:12 -0800 | [diff] [blame] | 270 | struct device_node *np = pdev->dev.of_node; |
| 271 | struct stmpe_ts_platform_data *ts_pdata = NULL; |
| 272 | |
| 273 | ts->stmpe = stmpe; |
| 274 | |
| 275 | if (stmpe->pdata && stmpe->pdata->ts) { |
| 276 | ts_pdata = stmpe->pdata->ts; |
| 277 | |
| 278 | ts->sample_time = ts_pdata->sample_time; |
| 279 | ts->mod_12b = ts_pdata->mod_12b; |
| 280 | ts->ref_sel = ts_pdata->ref_sel; |
| 281 | ts->adc_freq = ts_pdata->adc_freq; |
| 282 | ts->ave_ctrl = ts_pdata->ave_ctrl; |
| 283 | ts->touch_det_delay = ts_pdata->touch_det_delay; |
| 284 | ts->settling = ts_pdata->settling; |
| 285 | ts->fraction_z = ts_pdata->fraction_z; |
| 286 | ts->i_drive = ts_pdata->i_drive; |
| 287 | } else if (np) { |
| 288 | u32 val; |
| 289 | |
| 290 | if (!of_property_read_u32(np, "st,sample-time", &val)) |
| 291 | ts->sample_time = val; |
| 292 | if (!of_property_read_u32(np, "st,mod-12b", &val)) |
| 293 | ts->mod_12b = val; |
| 294 | if (!of_property_read_u32(np, "st,ref-sel", &val)) |
| 295 | ts->ref_sel = val; |
| 296 | if (!of_property_read_u32(np, "st,adc-freq", &val)) |
| 297 | ts->adc_freq = val; |
| 298 | if (!of_property_read_u32(np, "st,ave-ctrl", &val)) |
| 299 | ts->ave_ctrl = val; |
| 300 | if (!of_property_read_u32(np, "st,touch-det-delay", &val)) |
| 301 | ts->touch_det_delay = val; |
| 302 | if (!of_property_read_u32(np, "st,settling", &val)) |
| 303 | ts->settling = val; |
| 304 | if (!of_property_read_u32(np, "st,fraction-z", &val)) |
| 305 | ts->fraction_z = val; |
| 306 | if (!of_property_read_u32(np, "st,i-drive", &val)) |
| 307 | ts->i_drive = val; |
| 308 | } |
| 309 | } |
| 310 | |
| 311 | static int __devinit stmpe_input_probe(struct platform_device *pdev) |
| 312 | { |
Luotao Fu | f94add3 | 2010-07-02 14:10:29 +0200 | [diff] [blame] | 313 | struct stmpe_touch *ts; |
| 314 | struct input_dev *idev; |
Viresh Kumar | 2bd942f | 2012-11-09 23:56:59 -0800 | [diff] [blame] | 315 | int error; |
Kulikov Vasiliy | 3faeb35 | 2010-07-15 22:43:54 +0400 | [diff] [blame] | 316 | int ts_irq; |
Luotao Fu | f94add3 | 2010-07-02 14:10:29 +0200 | [diff] [blame] | 317 | |
| 318 | ts_irq = platform_get_irq_byname(pdev, "FIFO_TH"); |
| 319 | if (ts_irq < 0) |
| 320 | return ts_irq; |
| 321 | |
Viresh Kumar | 2bd942f | 2012-11-09 23:56:59 -0800 | [diff] [blame] | 322 | ts = devm_kzalloc(&pdev->dev, sizeof(*ts), GFP_KERNEL); |
| 323 | if (!ts) |
| 324 | return -ENOMEM; |
Luotao Fu | f94add3 | 2010-07-02 14:10:29 +0200 | [diff] [blame] | 325 | |
Viresh Kumar | 2bd942f | 2012-11-09 23:56:59 -0800 | [diff] [blame] | 326 | idev = devm_input_allocate_device(&pdev->dev); |
| 327 | if (!idev) |
| 328 | return -ENOMEM; |
Luotao Fu | f94add3 | 2010-07-02 14:10:29 +0200 | [diff] [blame] | 329 | |
| 330 | platform_set_drvdata(pdev, ts); |
Luotao Fu | f94add3 | 2010-07-02 14:10:29 +0200 | [diff] [blame] | 331 | ts->idev = idev; |
| 332 | ts->dev = &pdev->dev; |
| 333 | |
Vipul Kumar Samar | 037db52 | 2012-11-22 23:42:12 -0800 | [diff] [blame] | 334 | stmpe_ts_get_platform_info(pdev, ts); |
Luotao Fu | f94add3 | 2010-07-02 14:10:29 +0200 | [diff] [blame] | 335 | |
| 336 | INIT_DELAYED_WORK(&ts->work, stmpe_work); |
| 337 | |
Viresh Kumar | 2bd942f | 2012-11-09 23:56:59 -0800 | [diff] [blame] | 338 | error = devm_request_threaded_irq(&pdev->dev, ts_irq, |
| 339 | NULL, stmpe_ts_handler, |
| 340 | IRQF_ONESHOT, STMPE_TS_NAME, ts); |
| 341 | if (error) { |
Luotao Fu | f94add3 | 2010-07-02 14:10:29 +0200 | [diff] [blame] | 342 | dev_err(&pdev->dev, "Failed to request IRQ %d\n", ts_irq); |
Viresh Kumar | 2bd942f | 2012-11-09 23:56:59 -0800 | [diff] [blame] | 343 | return error; |
Luotao Fu | f94add3 | 2010-07-02 14:10:29 +0200 | [diff] [blame] | 344 | } |
| 345 | |
Viresh Kumar | 2bd942f | 2012-11-09 23:56:59 -0800 | [diff] [blame] | 346 | error = stmpe_init_hw(ts); |
| 347 | if (error) |
| 348 | return error; |
Luotao Fu | f94add3 | 2010-07-02 14:10:29 +0200 | [diff] [blame] | 349 | |
| 350 | idev->name = STMPE_TS_NAME; |
Vipul Kumar Samar | b8d52e2 | 2012-11-10 00:08:20 -0800 | [diff] [blame] | 351 | idev->phys = STMPE_TS_NAME"/input0"; |
Luotao Fu | f94add3 | 2010-07-02 14:10:29 +0200 | [diff] [blame] | 352 | idev->id.bustype = BUS_I2C; |
| 353 | idev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS); |
| 354 | idev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH); |
| 355 | |
| 356 | idev->open = stmpe_ts_open; |
| 357 | idev->close = stmpe_ts_close; |
| 358 | |
| 359 | input_set_drvdata(idev, ts); |
| 360 | |
| 361 | input_set_abs_params(idev, ABS_X, 0, XY_MASK, 0, 0); |
| 362 | input_set_abs_params(idev, ABS_Y, 0, XY_MASK, 0, 0); |
| 363 | input_set_abs_params(idev, ABS_PRESSURE, 0x0, 0xff, 0, 0); |
| 364 | |
Viresh Kumar | 2bd942f | 2012-11-09 23:56:59 -0800 | [diff] [blame] | 365 | error = input_register_device(idev); |
| 366 | if (error) { |
Luotao Fu | f94add3 | 2010-07-02 14:10:29 +0200 | [diff] [blame] | 367 | dev_err(&pdev->dev, "Could not register input device\n"); |
Viresh Kumar | 2bd942f | 2012-11-09 23:56:59 -0800 | [diff] [blame] | 368 | return error; |
Luotao Fu | f94add3 | 2010-07-02 14:10:29 +0200 | [diff] [blame] | 369 | } |
| 370 | |
Viresh Kumar | 2bd942f | 2012-11-09 23:56:59 -0800 | [diff] [blame] | 371 | return 0; |
Luotao Fu | f94add3 | 2010-07-02 14:10:29 +0200 | [diff] [blame] | 372 | } |
| 373 | |
| 374 | static int __devexit stmpe_ts_remove(struct platform_device *pdev) |
| 375 | { |
| 376 | struct stmpe_touch *ts = platform_get_drvdata(pdev); |
Luotao Fu | f94add3 | 2010-07-02 14:10:29 +0200 | [diff] [blame] | 377 | |
| 378 | stmpe_disable(ts->stmpe, STMPE_BLOCK_TOUCHSCREEN); |
| 379 | |
Luotao Fu | f94add3 | 2010-07-02 14:10:29 +0200 | [diff] [blame] | 380 | return 0; |
| 381 | } |
| 382 | |
| 383 | static struct platform_driver stmpe_ts_driver = { |
| 384 | .driver = { |
| 385 | .name = STMPE_TS_NAME, |
| 386 | .owner = THIS_MODULE, |
| 387 | }, |
| 388 | .probe = stmpe_input_probe, |
| 389 | .remove = __devexit_p(stmpe_ts_remove), |
| 390 | }; |
JJ Ding | cdcc96e | 2011-11-29 11:14:13 -0800 | [diff] [blame] | 391 | module_platform_driver(stmpe_ts_driver); |
Luotao Fu | f94add3 | 2010-07-02 14:10:29 +0200 | [diff] [blame] | 392 | |
| 393 | MODULE_AUTHOR("Luotao Fu <l.fu@pengutronix.de>"); |
| 394 | MODULE_DESCRIPTION("STMPEXXX touchscreen driver"); |
| 395 | MODULE_LICENSE("GPL"); |
| 396 | MODULE_ALIAS("platform:" STMPE_TS_NAME); |