Blame view
drivers/mfd/ucb1x00-ts.c
10.7 KB
acb45439a
|
1 |
/* |
5437775e0
|
2 |
* Touchscreen driver for UCB1x00-based touchscreens |
acb45439a
|
3 4 |
* * Copyright (C) 2001 Russell King, All Rights Reserved. |
5437775e0
|
5 |
* Copyright (C) 2005 Pavel Machek |
acb45439a
|
6 7 8 9 10 11 12 13 14 15 16 17 18 19 |
* * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. * * 21-Jan-2002 <jco@ict.es> : * * Added support for synchronous A/D mode. This mode is useful to * avoid noise induced in the touchpanel by the LCD, provided that * the UCB1x00 has a valid LCD sync signal routed to its ADCSYNC pin. * It is important to note that the signal connected to the ADCSYNC * pin should provide pulses even when the LCD is blanked, otherwise * a pen touch needed to unblank the LCD will never be read. */ |
acb45439a
|
20 21 22 23 |
#include <linux/module.h> #include <linux/moduleparam.h> #include <linux/init.h> #include <linux/smp.h> |
acb45439a
|
24 25 26 27 28 29 |
#include <linux/sched.h> #include <linux/completion.h> #include <linux/delay.h> #include <linux/string.h> #include <linux/input.h> #include <linux/device.h> |
7dfb71030
|
30 |
#include <linux/freezer.h> |
acb45439a
|
31 |
#include <linux/slab.h> |
5437775e0
|
32 |
#include <linux/kthread.h> |
c8602edf3
|
33 |
#include <linux/mfd/ucb1x00.h> |
acb45439a
|
34 |
|
dcea83adc
|
35 |
#include <mach/dma.h> |
a09e64fbc
|
36 |
#include <mach/collie.h> |
175329894
|
37 |
#include <asm/mach-types.h> |
acb45439a
|
38 |
|
acb45439a
|
39 40 41 |
struct ucb1x00_ts { |
bd6226631
|
42 |
struct input_dev *idev; |
acb45439a
|
43 44 45 |
struct ucb1x00 *ucb; wait_queue_head_t irq_wait; |
acb45439a
|
46 |
struct task_struct *rtask; |
acb45439a
|
47 48 |
u16 x_res; u16 y_res; |
6b9ea4213
|
49 50 |
unsigned int restart:1; unsigned int adcsync:1; |
acb45439a
|
51 52 53 54 55 56 |
}; static int adcsync; static inline void ucb1x00_ts_evt_add(struct ucb1x00_ts *ts, u16 pressure, u16 x, u16 y) { |
1393c3edc
|
57 |
struct input_dev *idev = ts->idev; |
08c67d2a5
|
58 |
|
1393c3edc
|
59 60 61 |
input_report_abs(idev, ABS_X, x); input_report_abs(idev, ABS_Y, y); input_report_abs(idev, ABS_PRESSURE, pressure); |
de8c8b068
|
62 |
input_report_key(idev, BTN_TOUCH, 1); |
1393c3edc
|
63 |
input_sync(idev); |
acb45439a
|
64 65 66 67 |
} static inline void ucb1x00_ts_event_release(struct ucb1x00_ts *ts) { |
1393c3edc
|
68 |
struct input_dev *idev = ts->idev; |
08c67d2a5
|
69 |
|
1393c3edc
|
70 |
input_report_abs(idev, ABS_PRESSURE, 0); |
de8c8b068
|
71 |
input_report_key(idev, BTN_TOUCH, 0); |
1393c3edc
|
72 |
input_sync(idev); |
acb45439a
|
73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 |
} /* * Switch to interrupt mode. */ static inline void ucb1x00_ts_mode_int(struct ucb1x00_ts *ts) { ucb1x00_reg_write(ts->ucb, UCB_TS_CR, UCB_TS_CR_TSMX_POW | UCB_TS_CR_TSPX_POW | UCB_TS_CR_TSMY_GND | UCB_TS_CR_TSPY_GND | UCB_TS_CR_MODE_INT); } /* * Switch to pressure mode, and read pressure. We don't need to wait * here, since both plates are being driven. */ static inline unsigned int ucb1x00_ts_read_pressure(struct ucb1x00_ts *ts) { |
175329894
|
92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 |
if (machine_is_collie()) { ucb1x00_io_write(ts->ucb, COLLIE_TC35143_GPIO_TBL_CHK, 0); ucb1x00_reg_write(ts->ucb, UCB_TS_CR, UCB_TS_CR_TSPX_POW | UCB_TS_CR_TSMX_POW | UCB_TS_CR_MODE_POS | UCB_TS_CR_BIAS_ENA); udelay(55); return ucb1x00_adc_read(ts->ucb, UCB_ADC_INP_AD2, ts->adcsync); } else { ucb1x00_reg_write(ts->ucb, UCB_TS_CR, UCB_TS_CR_TSMX_POW | UCB_TS_CR_TSPX_POW | UCB_TS_CR_TSMY_GND | UCB_TS_CR_TSPY_GND | UCB_TS_CR_MODE_PRES | UCB_TS_CR_BIAS_ENA); return ucb1x00_adc_read(ts->ucb, UCB_ADC_INP_TSPY, ts->adcsync); } |
acb45439a
|
109 110 111 112 113 114 115 116 117 118 |
} /* * Switch to X position mode and measure Y plate. We switch the plate * configuration in pressure mode, then switch to position mode. This * gives a faster response time. Even so, we need to wait about 55us * for things to stabilise. */ static inline unsigned int ucb1x00_ts_read_xpos(struct ucb1x00_ts *ts) { |
175329894
|
119 120 121 122 123 124 125 126 127 128 |
if (machine_is_collie()) ucb1x00_io_write(ts->ucb, 0, COLLIE_TC35143_GPIO_TBL_CHK); else { ucb1x00_reg_write(ts->ucb, UCB_TS_CR, UCB_TS_CR_TSMX_GND | UCB_TS_CR_TSPX_POW | UCB_TS_CR_MODE_PRES | UCB_TS_CR_BIAS_ENA); ucb1x00_reg_write(ts->ucb, UCB_TS_CR, UCB_TS_CR_TSMX_GND | UCB_TS_CR_TSPX_POW | UCB_TS_CR_MODE_PRES | UCB_TS_CR_BIAS_ENA); } |
acb45439a
|
129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 |
ucb1x00_reg_write(ts->ucb, UCB_TS_CR, UCB_TS_CR_TSMX_GND | UCB_TS_CR_TSPX_POW | UCB_TS_CR_MODE_POS | UCB_TS_CR_BIAS_ENA); udelay(55); return ucb1x00_adc_read(ts->ucb, UCB_ADC_INP_TSPY, ts->adcsync); } /* * Switch to Y position mode and measure X plate. We switch the plate * configuration in pressure mode, then switch to position mode. This * gives a faster response time. Even so, we need to wait about 55us * for things to stabilise. */ static inline unsigned int ucb1x00_ts_read_ypos(struct ucb1x00_ts *ts) { |
175329894
|
146 147 148 149 150 151 152 153 154 155 |
if (machine_is_collie()) ucb1x00_io_write(ts->ucb, 0, COLLIE_TC35143_GPIO_TBL_CHK); else { ucb1x00_reg_write(ts->ucb, UCB_TS_CR, UCB_TS_CR_TSMY_GND | UCB_TS_CR_TSPY_POW | UCB_TS_CR_MODE_PRES | UCB_TS_CR_BIAS_ENA); ucb1x00_reg_write(ts->ucb, UCB_TS_CR, UCB_TS_CR_TSMY_GND | UCB_TS_CR_TSPY_POW | UCB_TS_CR_MODE_PRES | UCB_TS_CR_BIAS_ENA); } |
acb45439a
|
156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 |
ucb1x00_reg_write(ts->ucb, UCB_TS_CR, UCB_TS_CR_TSMY_GND | UCB_TS_CR_TSPY_POW | UCB_TS_CR_MODE_POS | UCB_TS_CR_BIAS_ENA); udelay(55); return ucb1x00_adc_read(ts->ucb, UCB_ADC_INP_TSPX, ts->adcsync); } /* * Switch to X plate resistance mode. Set MX to ground, PX to * supply. Measure current. */ static inline unsigned int ucb1x00_ts_read_xres(struct ucb1x00_ts *ts) { ucb1x00_reg_write(ts->ucb, UCB_TS_CR, UCB_TS_CR_TSMX_GND | UCB_TS_CR_TSPX_POW | UCB_TS_CR_MODE_PRES | UCB_TS_CR_BIAS_ENA); return ucb1x00_adc_read(ts->ucb, 0, ts->adcsync); } /* * Switch to Y plate resistance mode. Set MY to ground, PY to * supply. Measure current. */ static inline unsigned int ucb1x00_ts_read_yres(struct ucb1x00_ts *ts) { ucb1x00_reg_write(ts->ucb, UCB_TS_CR, UCB_TS_CR_TSMY_GND | UCB_TS_CR_TSPY_POW | UCB_TS_CR_MODE_PRES | UCB_TS_CR_BIAS_ENA); return ucb1x00_adc_read(ts->ucb, 0, ts->adcsync); } |
175329894
|
188 189 190 |
static inline int ucb1x00_ts_pen_down(struct ucb1x00_ts *ts) { unsigned int val = ucb1x00_reg_read(ts->ucb, UCB_TS_CR); |
08c67d2a5
|
191 |
|
175329894
|
192 193 194 195 196 |
if (machine_is_collie()) return (!(val & (UCB_TS_CR_TSPX_LOW))); else return (val & (UCB_TS_CR_TSPX_LOW | UCB_TS_CR_TSMX_LOW)); } |
acb45439a
|
197 198 199 200 201 202 203 204 |
/* * This is a RT kernel thread that handles the ADC accesses * (mainly so we can use semaphores in the UCB1200 core code * to serialise accesses to the ADC). */ static int ucb1x00_thread(void *_ts) { struct ucb1x00_ts *ts = _ts; |
f7440b0ec
|
205 |
DECLARE_WAITQUEUE(wait, current); |
1124d5ca7
|
206 |
int valid = 0; |
acb45439a
|
207 |
|
831441862
|
208 |
set_freezable(); |
acb45439a
|
209 |
add_wait_queue(&ts->irq_wait, &wait); |
5437775e0
|
210 |
while (!kthread_should_stop()) { |
175329894
|
211 |
unsigned int x, y, p; |
acb45439a
|
212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 |
signed long timeout; ts->restart = 0; ucb1x00_adc_enable(ts->ucb); x = ucb1x00_ts_read_xpos(ts); y = ucb1x00_ts_read_ypos(ts); p = ucb1x00_ts_read_pressure(ts); /* * Switch back to interrupt mode. */ ucb1x00_ts_mode_int(ts); ucb1x00_adc_disable(ts->ucb); |
5437775e0
|
227 |
msleep(10); |
acb45439a
|
228 229 |
ucb1x00_enable(ts->ucb); |
acb45439a
|
230 |
|
175329894
|
231 232 |
if (ucb1x00_ts_pen_down(ts)) { |
f7440b0ec
|
233 |
set_current_state(TASK_INTERRUPTIBLE); |
acb45439a
|
234 |
|
175329894
|
235 |
ucb1x00_enable_irq(ts->ucb, UCB_IRQ_TSPX, machine_is_collie() ? UCB_RISING : UCB_FALLING); |
acb45439a
|
236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 |
ucb1x00_disable(ts->ucb); /* * If we spat out a valid sample set last time, * spit out a "pen off" sample here. */ if (valid) { ucb1x00_ts_event_release(ts); valid = 0; } timeout = MAX_SCHEDULE_TIMEOUT; } else { ucb1x00_disable(ts->ucb); /* * Filtering is policy. Policy belongs in user * space. We therefore leave it to user space * to do any filtering they please. */ if (!ts->restart) { ucb1x00_ts_evt_add(ts, p, x, y); valid = 1; } |
f7440b0ec
|
260 |
set_current_state(TASK_INTERRUPTIBLE); |
acb45439a
|
261 262 263 264 265 266 |
timeout = HZ / 100; } try_to_freeze(); schedule_timeout(timeout); |
acb45439a
|
267 268 269 270 271 |
} remove_wait_queue(&ts->irq_wait, &wait); ts->rtask = NULL; |
5437775e0
|
272 |
return 0; |
acb45439a
|
273 274 275 276 277 278 279 280 281 |
} /* * We only detect touch screen _touches_ with this interrupt * handler, and even then we just schedule our task. */ static void ucb1x00_ts_irq(int idx, void *id) { struct ucb1x00_ts *ts = id; |
08c67d2a5
|
282 |
|
acb45439a
|
283 284 285 286 287 288 |
ucb1x00_disable_irq(ts->ucb, UCB_IRQ_TSPX, UCB_FALLING); wake_up(&ts->irq_wait); } static int ucb1x00_ts_open(struct input_dev *idev) { |
26be5a509
|
289 |
struct ucb1x00_ts *ts = input_get_drvdata(idev); |
acb45439a
|
290 |
int ret = 0; |
5437775e0
|
291 |
BUG_ON(ts->rtask); |
acb45439a
|
292 293 294 295 296 297 298 299 300 301 302 303 304 305 |
init_waitqueue_head(&ts->irq_wait); ret = ucb1x00_hook_irq(ts->ucb, UCB_IRQ_TSPX, ucb1x00_ts_irq, ts); if (ret < 0) goto out; /* * If we do this at all, we should allow the user to * measure and read the X and Y resistance at any time. */ ucb1x00_adc_enable(ts->ucb); ts->x_res = ucb1x00_ts_read_xres(ts); ts->y_res = ucb1x00_ts_read_yres(ts); ucb1x00_adc_disable(ts->ucb); |
5437775e0
|
306 307 |
ts->rtask = kthread_run(ucb1x00_thread, ts, "ktsd"); if (!IS_ERR(ts->rtask)) { |
acb45439a
|
308 309 310 |
ret = 0; } else { ucb1x00_free_irq(ts->ucb, UCB_IRQ_TSPX, ts); |
5437775e0
|
311 312 |
ts->rtask = NULL; ret = -EFAULT; |
acb45439a
|
313 314 315 |
} out: |
acb45439a
|
316 317 318 319 320 321 322 323 |
return ret; } /* * Release touchscreen resources. Disable IRQs. */ static void ucb1x00_ts_close(struct input_dev *idev) { |
26be5a509
|
324 |
struct ucb1x00_ts *ts = input_get_drvdata(idev); |
acb45439a
|
325 |
|
5437775e0
|
326 327 |
if (ts->rtask) kthread_stop(ts->rtask); |
acb45439a
|
328 |
|
5437775e0
|
329 330 331 332 |
ucb1x00_enable(ts->ucb); ucb1x00_free_irq(ts->ucb, UCB_IRQ_TSPX, ts); ucb1x00_reg_write(ts->ucb, UCB_TS_CR, 0); ucb1x00_disable(ts->ucb); |
acb45439a
|
333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 |
} #ifdef CONFIG_PM static int ucb1x00_ts_resume(struct ucb1x00_dev *dev) { struct ucb1x00_ts *ts = dev->priv; if (ts->rtask != NULL) { /* * Restart the TS thread to ensure the * TS interrupt mode is set up again * after sleep. */ ts->restart = 1; wake_up(&ts->irq_wait); } return 0; } #else #define ucb1x00_ts_resume NULL #endif /* * Initialisation. */ static int ucb1x00_ts_add(struct ucb1x00_dev *dev) { struct ucb1x00_ts *ts; |
08c67d2a5
|
362 363 |
struct input_dev *idev; int err; |
acb45439a
|
364 |
|
bd6226631
|
365 |
ts = kzalloc(sizeof(struct ucb1x00_ts), GFP_KERNEL); |
08c67d2a5
|
366 367 368 369 |
idev = input_allocate_device(); if (!ts || !idev) { err = -ENOMEM; goto fail; |
bd6226631
|
370 |
} |
acb45439a
|
371 372 |
ts->ucb = dev->ucb; |
08c67d2a5
|
373 |
ts->idev = idev; |
acb45439a
|
374 |
ts->adcsync = adcsync ? UCB_SYNC : UCB_NOSYNC; |
acb45439a
|
375 |
|
08c67d2a5
|
376 377 378 379 |
idev->name = "Touchscreen panel"; idev->id.product = ts->ucb->id; idev->open = ucb1x00_ts_open; idev->close = ucb1x00_ts_close; |
acb45439a
|
380 |
|
de8c8b068
|
381 382 |
idev->evbit[0] = BIT_MASK(EV_ABS) | BIT_MASK(EV_KEY); idev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH); |
acb45439a
|
383 |
|
26be5a509
|
384 |
input_set_drvdata(idev, ts); |
9063f1f15
|
385 386 387 388 389 390 391 392 |
ucb1x00_adc_enable(ts->ucb); ts->x_res = ucb1x00_ts_read_xres(ts); ts->y_res = ucb1x00_ts_read_yres(ts); ucb1x00_adc_disable(ts->ucb); input_set_abs_params(idev, ABS_X, 0, ts->x_res, 0, 0); input_set_abs_params(idev, ABS_Y, 0, ts->y_res, 0, 0); input_set_abs_params(idev, ABS_PRESSURE, 0, 0, 0, 0); |
08c67d2a5
|
393 394 395 |
err = input_register_device(idev); if (err) goto fail; |
acb45439a
|
396 397 398 399 |
dev->priv = ts; return 0; |
08c67d2a5
|
400 401 402 403 404 |
fail: input_free_device(idev); kfree(ts); return err; |
acb45439a
|
405 406 407 408 409 |
} static void ucb1x00_ts_remove(struct ucb1x00_dev *dev) { struct ucb1x00_ts *ts = dev->priv; |
bd6226631
|
410 411 |
input_unregister_device(ts->idev); |
acb45439a
|
412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 |
kfree(ts); } static struct ucb1x00_driver ucb1x00_ts_driver = { .add = ucb1x00_ts_add, .remove = ucb1x00_ts_remove, .resume = ucb1x00_ts_resume, }; static int __init ucb1x00_ts_init(void) { return ucb1x00_register_driver(&ucb1x00_ts_driver); } static void __exit ucb1x00_ts_exit(void) { ucb1x00_unregister_driver(&ucb1x00_ts_driver); } module_param(adcsync, int, 0444); module_init(ucb1x00_ts_init); module_exit(ucb1x00_ts_exit); MODULE_AUTHOR("Russell King <rmk@arm.linux.org.uk>"); MODULE_DESCRIPTION("UCB1x00 touchscreen driver"); MODULE_LICENSE("GPL"); |