Commit | Line | Data |
---|---|---|
acb45439 | 1 | /* |
5437775e | 2 | * Touchscreen driver for UCB1x00-based touchscreens |
acb45439 RK |
3 | * |
4 | * Copyright (C) 2001 Russell King, All Rights Reserved. | |
5437775e | 5 | * Copyright (C) 2005 Pavel Machek |
acb45439 RK |
6 | * |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License version 2 as | |
9 | * published by the Free Software Foundation. | |
10 | * | |
11 | * 21-Jan-2002 <jco@ict.es> : | |
12 | * | |
13 | * Added support for synchronous A/D mode. This mode is useful to | |
14 | * avoid noise induced in the touchpanel by the LCD, provided that | |
15 | * the UCB1x00 has a valid LCD sync signal routed to its ADCSYNC pin. | |
16 | * It is important to note that the signal connected to the ADCSYNC | |
17 | * pin should provide pulses even when the LCD is blanked, otherwise | |
18 | * a pen touch needed to unblank the LCD will never be read. | |
19 | */ | |
acb45439 RK |
20 | #include <linux/module.h> |
21 | #include <linux/moduleparam.h> | |
22 | #include <linux/init.h> | |
23 | #include <linux/smp.h> | |
24 | #include <linux/smp_lock.h> | |
25 | #include <linux/sched.h> | |
26 | #include <linux/completion.h> | |
27 | #include <linux/delay.h> | |
28 | #include <linux/string.h> | |
29 | #include <linux/input.h> | |
30 | #include <linux/device.h> | |
7dfb7103 | 31 | #include <linux/freezer.h> |
acb45439 | 32 | #include <linux/slab.h> |
5437775e | 33 | #include <linux/kthread.h> |
acb45439 RK |
34 | |
35 | #include <asm/dma.h> | |
36 | #include <asm/semaphore.h> | |
17532989 PM |
37 | #include <asm/arch/collie.h> |
38 | #include <asm/mach-types.h> | |
acb45439 RK |
39 | |
40 | #include "ucb1x00.h" | |
41 | ||
42 | ||
43 | struct ucb1x00_ts { | |
bd622663 | 44 | struct input_dev *idev; |
acb45439 RK |
45 | struct ucb1x00 *ucb; |
46 | ||
47 | wait_queue_head_t irq_wait; | |
acb45439 | 48 | struct task_struct *rtask; |
acb45439 RK |
49 | u16 x_res; |
50 | u16 y_res; | |
51 | ||
6b9ea421 RK |
52 | unsigned int restart:1; |
53 | unsigned int adcsync:1; | |
acb45439 RK |
54 | }; |
55 | ||
56 | static int adcsync; | |
57 | ||
58 | static inline void ucb1x00_ts_evt_add(struct ucb1x00_ts *ts, u16 pressure, u16 x, u16 y) | |
59 | { | |
1393c3ed | 60 | struct input_dev *idev = ts->idev; |
08c67d2a | 61 | |
1393c3ed NP |
62 | input_report_abs(idev, ABS_X, x); |
63 | input_report_abs(idev, ABS_Y, y); | |
64 | input_report_abs(idev, ABS_PRESSURE, pressure); | |
65 | input_sync(idev); | |
acb45439 RK |
66 | } |
67 | ||
68 | static inline void ucb1x00_ts_event_release(struct ucb1x00_ts *ts) | |
69 | { | |
1393c3ed | 70 | struct input_dev *idev = ts->idev; |
08c67d2a | 71 | |
1393c3ed NP |
72 | input_report_abs(idev, ABS_PRESSURE, 0); |
73 | input_sync(idev); | |
acb45439 RK |
74 | } |
75 | ||
76 | /* | |
77 | * Switch to interrupt mode. | |
78 | */ | |
79 | static inline void ucb1x00_ts_mode_int(struct ucb1x00_ts *ts) | |
80 | { | |
81 | ucb1x00_reg_write(ts->ucb, UCB_TS_CR, | |
82 | UCB_TS_CR_TSMX_POW | UCB_TS_CR_TSPX_POW | | |
83 | UCB_TS_CR_TSMY_GND | UCB_TS_CR_TSPY_GND | | |
84 | UCB_TS_CR_MODE_INT); | |
85 | } | |
86 | ||
87 | /* | |
88 | * Switch to pressure mode, and read pressure. We don't need to wait | |
89 | * here, since both plates are being driven. | |
90 | */ | |
91 | static inline unsigned int ucb1x00_ts_read_pressure(struct ucb1x00_ts *ts) | |
92 | { | |
17532989 PM |
93 | if (machine_is_collie()) { |
94 | ucb1x00_io_write(ts->ucb, COLLIE_TC35143_GPIO_TBL_CHK, 0); | |
95 | ucb1x00_reg_write(ts->ucb, UCB_TS_CR, | |
96 | UCB_TS_CR_TSPX_POW | UCB_TS_CR_TSMX_POW | | |
97 | UCB_TS_CR_MODE_POS | UCB_TS_CR_BIAS_ENA); | |
98 | ||
99 | udelay(55); | |
100 | ||
101 | return ucb1x00_adc_read(ts->ucb, UCB_ADC_INP_AD2, ts->adcsync); | |
102 | } else { | |
103 | ucb1x00_reg_write(ts->ucb, UCB_TS_CR, | |
104 | UCB_TS_CR_TSMX_POW | UCB_TS_CR_TSPX_POW | | |
105 | UCB_TS_CR_TSMY_GND | UCB_TS_CR_TSPY_GND | | |
106 | UCB_TS_CR_MODE_PRES | UCB_TS_CR_BIAS_ENA); | |
107 | ||
108 | return ucb1x00_adc_read(ts->ucb, UCB_ADC_INP_TSPY, ts->adcsync); | |
109 | } | |
acb45439 RK |
110 | } |
111 | ||
112 | /* | |
113 | * Switch to X position mode and measure Y plate. We switch the plate | |
114 | * configuration in pressure mode, then switch to position mode. This | |
115 | * gives a faster response time. Even so, we need to wait about 55us | |
116 | * for things to stabilise. | |
117 | */ | |
118 | static inline unsigned int ucb1x00_ts_read_xpos(struct ucb1x00_ts *ts) | |
119 | { | |
17532989 PM |
120 | if (machine_is_collie()) |
121 | ucb1x00_io_write(ts->ucb, 0, COLLIE_TC35143_GPIO_TBL_CHK); | |
122 | else { | |
123 | ucb1x00_reg_write(ts->ucb, UCB_TS_CR, | |
124 | UCB_TS_CR_TSMX_GND | UCB_TS_CR_TSPX_POW | | |
125 | UCB_TS_CR_MODE_PRES | UCB_TS_CR_BIAS_ENA); | |
126 | ucb1x00_reg_write(ts->ucb, UCB_TS_CR, | |
127 | UCB_TS_CR_TSMX_GND | UCB_TS_CR_TSPX_POW | | |
128 | UCB_TS_CR_MODE_PRES | UCB_TS_CR_BIAS_ENA); | |
129 | } | |
acb45439 RK |
130 | ucb1x00_reg_write(ts->ucb, UCB_TS_CR, |
131 | UCB_TS_CR_TSMX_GND | UCB_TS_CR_TSPX_POW | | |
132 | UCB_TS_CR_MODE_POS | UCB_TS_CR_BIAS_ENA); | |
133 | ||
134 | udelay(55); | |
135 | ||
136 | return ucb1x00_adc_read(ts->ucb, UCB_ADC_INP_TSPY, ts->adcsync); | |
137 | } | |
138 | ||
139 | /* | |
140 | * Switch to Y position mode and measure X plate. We switch the plate | |
141 | * configuration in pressure mode, then switch to position mode. This | |
142 | * gives a faster response time. Even so, we need to wait about 55us | |
143 | * for things to stabilise. | |
144 | */ | |
145 | static inline unsigned int ucb1x00_ts_read_ypos(struct ucb1x00_ts *ts) | |
146 | { | |
17532989 PM |
147 | if (machine_is_collie()) |
148 | ucb1x00_io_write(ts->ucb, 0, COLLIE_TC35143_GPIO_TBL_CHK); | |
149 | else { | |
150 | ucb1x00_reg_write(ts->ucb, UCB_TS_CR, | |
151 | UCB_TS_CR_TSMY_GND | UCB_TS_CR_TSPY_POW | | |
152 | UCB_TS_CR_MODE_PRES | UCB_TS_CR_BIAS_ENA); | |
153 | ucb1x00_reg_write(ts->ucb, UCB_TS_CR, | |
154 | UCB_TS_CR_TSMY_GND | UCB_TS_CR_TSPY_POW | | |
155 | UCB_TS_CR_MODE_PRES | UCB_TS_CR_BIAS_ENA); | |
156 | } | |
157 | ||
acb45439 RK |
158 | ucb1x00_reg_write(ts->ucb, UCB_TS_CR, |
159 | UCB_TS_CR_TSMY_GND | UCB_TS_CR_TSPY_POW | | |
160 | UCB_TS_CR_MODE_POS | UCB_TS_CR_BIAS_ENA); | |
161 | ||
162 | udelay(55); | |
163 | ||
164 | return ucb1x00_adc_read(ts->ucb, UCB_ADC_INP_TSPX, ts->adcsync); | |
165 | } | |
166 | ||
167 | /* | |
168 | * Switch to X plate resistance mode. Set MX to ground, PX to | |
169 | * supply. Measure current. | |
170 | */ | |
171 | static inline unsigned int ucb1x00_ts_read_xres(struct ucb1x00_ts *ts) | |
172 | { | |
173 | ucb1x00_reg_write(ts->ucb, UCB_TS_CR, | |
174 | UCB_TS_CR_TSMX_GND | UCB_TS_CR_TSPX_POW | | |
175 | UCB_TS_CR_MODE_PRES | UCB_TS_CR_BIAS_ENA); | |
176 | return ucb1x00_adc_read(ts->ucb, 0, ts->adcsync); | |
177 | } | |
178 | ||
179 | /* | |
180 | * Switch to Y plate resistance mode. Set MY to ground, PY to | |
181 | * supply. Measure current. | |
182 | */ | |
183 | static inline unsigned int ucb1x00_ts_read_yres(struct ucb1x00_ts *ts) | |
184 | { | |
185 | ucb1x00_reg_write(ts->ucb, UCB_TS_CR, | |
186 | UCB_TS_CR_TSMY_GND | UCB_TS_CR_TSPY_POW | | |
187 | UCB_TS_CR_MODE_PRES | UCB_TS_CR_BIAS_ENA); | |
188 | return ucb1x00_adc_read(ts->ucb, 0, ts->adcsync); | |
189 | } | |
190 | ||
17532989 PM |
191 | static inline int ucb1x00_ts_pen_down(struct ucb1x00_ts *ts) |
192 | { | |
193 | unsigned int val = ucb1x00_reg_read(ts->ucb, UCB_TS_CR); | |
08c67d2a | 194 | |
17532989 PM |
195 | if (machine_is_collie()) |
196 | return (!(val & (UCB_TS_CR_TSPX_LOW))); | |
197 | else | |
198 | return (val & (UCB_TS_CR_TSPX_LOW | UCB_TS_CR_TSMX_LOW)); | |
199 | } | |
200 | ||
acb45439 RK |
201 | /* |
202 | * This is a RT kernel thread that handles the ADC accesses | |
203 | * (mainly so we can use semaphores in the UCB1200 core code | |
204 | * to serialise accesses to the ADC). | |
205 | */ | |
206 | static int ucb1x00_thread(void *_ts) | |
207 | { | |
208 | struct ucb1x00_ts *ts = _ts; | |
209 | struct task_struct *tsk = current; | |
210 | DECLARE_WAITQUEUE(wait, tsk); | |
211 | int valid; | |
212 | ||
acb45439 RK |
213 | /* |
214 | * We could run as a real-time thread. However, thus far | |
215 | * this doesn't seem to be necessary. | |
216 | */ | |
217 | // tsk->policy = SCHED_FIFO; | |
218 | // tsk->rt_priority = 1; | |
219 | ||
acb45439 RK |
220 | valid = 0; |
221 | ||
222 | add_wait_queue(&ts->irq_wait, &wait); | |
5437775e | 223 | while (!kthread_should_stop()) { |
17532989 | 224 | unsigned int x, y, p; |
acb45439 RK |
225 | signed long timeout; |
226 | ||
227 | ts->restart = 0; | |
228 | ||
229 | ucb1x00_adc_enable(ts->ucb); | |
230 | ||
231 | x = ucb1x00_ts_read_xpos(ts); | |
232 | y = ucb1x00_ts_read_ypos(ts); | |
233 | p = ucb1x00_ts_read_pressure(ts); | |
234 | ||
235 | /* | |
236 | * Switch back to interrupt mode. | |
237 | */ | |
238 | ucb1x00_ts_mode_int(ts); | |
239 | ucb1x00_adc_disable(ts->ucb); | |
240 | ||
5437775e | 241 | msleep(10); |
acb45439 RK |
242 | |
243 | ucb1x00_enable(ts->ucb); | |
acb45439 | 244 | |
17532989 PM |
245 | |
246 | if (ucb1x00_ts_pen_down(ts)) { | |
acb45439 RK |
247 | set_task_state(tsk, TASK_INTERRUPTIBLE); |
248 | ||
17532989 | 249 | ucb1x00_enable_irq(ts->ucb, UCB_IRQ_TSPX, machine_is_collie() ? UCB_RISING : UCB_FALLING); |
acb45439 RK |
250 | ucb1x00_disable(ts->ucb); |
251 | ||
252 | /* | |
253 | * If we spat out a valid sample set last time, | |
254 | * spit out a "pen off" sample here. | |
255 | */ | |
256 | if (valid) { | |
257 | ucb1x00_ts_event_release(ts); | |
258 | valid = 0; | |
259 | } | |
260 | ||
261 | timeout = MAX_SCHEDULE_TIMEOUT; | |
262 | } else { | |
263 | ucb1x00_disable(ts->ucb); | |
264 | ||
265 | /* | |
266 | * Filtering is policy. Policy belongs in user | |
267 | * space. We therefore leave it to user space | |
268 | * to do any filtering they please. | |
269 | */ | |
270 | if (!ts->restart) { | |
271 | ucb1x00_ts_evt_add(ts, p, x, y); | |
272 | valid = 1; | |
273 | } | |
274 | ||
275 | set_task_state(tsk, TASK_INTERRUPTIBLE); | |
276 | timeout = HZ / 100; | |
277 | } | |
278 | ||
279 | try_to_freeze(); | |
280 | ||
281 | schedule_timeout(timeout); | |
acb45439 RK |
282 | } |
283 | ||
284 | remove_wait_queue(&ts->irq_wait, &wait); | |
285 | ||
286 | ts->rtask = NULL; | |
5437775e | 287 | return 0; |
acb45439 RK |
288 | } |
289 | ||
290 | /* | |
291 | * We only detect touch screen _touches_ with this interrupt | |
292 | * handler, and even then we just schedule our task. | |
293 | */ | |
294 | static void ucb1x00_ts_irq(int idx, void *id) | |
295 | { | |
296 | struct ucb1x00_ts *ts = id; | |
08c67d2a | 297 | |
acb45439 RK |
298 | ucb1x00_disable_irq(ts->ucb, UCB_IRQ_TSPX, UCB_FALLING); |
299 | wake_up(&ts->irq_wait); | |
300 | } | |
301 | ||
302 | static int ucb1x00_ts_open(struct input_dev *idev) | |
303 | { | |
1393c3ed | 304 | struct ucb1x00_ts *ts = idev->private; |
acb45439 RK |
305 | int ret = 0; |
306 | ||
5437775e | 307 | BUG_ON(ts->rtask); |
acb45439 RK |
308 | |
309 | init_waitqueue_head(&ts->irq_wait); | |
310 | ret = ucb1x00_hook_irq(ts->ucb, UCB_IRQ_TSPX, ucb1x00_ts_irq, ts); | |
311 | if (ret < 0) | |
312 | goto out; | |
313 | ||
314 | /* | |
315 | * If we do this at all, we should allow the user to | |
316 | * measure and read the X and Y resistance at any time. | |
317 | */ | |
318 | ucb1x00_adc_enable(ts->ucb); | |
319 | ts->x_res = ucb1x00_ts_read_xres(ts); | |
320 | ts->y_res = ucb1x00_ts_read_yres(ts); | |
321 | ucb1x00_adc_disable(ts->ucb); | |
322 | ||
5437775e PM |
323 | ts->rtask = kthread_run(ucb1x00_thread, ts, "ktsd"); |
324 | if (!IS_ERR(ts->rtask)) { | |
acb45439 RK |
325 | ret = 0; |
326 | } else { | |
327 | ucb1x00_free_irq(ts->ucb, UCB_IRQ_TSPX, ts); | |
5437775e PM |
328 | ts->rtask = NULL; |
329 | ret = -EFAULT; | |
acb45439 RK |
330 | } |
331 | ||
332 | out: | |
acb45439 RK |
333 | return ret; |
334 | } | |
335 | ||
336 | /* | |
337 | * Release touchscreen resources. Disable IRQs. | |
338 | */ | |
339 | static void ucb1x00_ts_close(struct input_dev *idev) | |
340 | { | |
1393c3ed | 341 | struct ucb1x00_ts *ts = idev->private; |
acb45439 | 342 | |
5437775e PM |
343 | if (ts->rtask) |
344 | kthread_stop(ts->rtask); | |
acb45439 | 345 | |
5437775e PM |
346 | ucb1x00_enable(ts->ucb); |
347 | ucb1x00_free_irq(ts->ucb, UCB_IRQ_TSPX, ts); | |
348 | ucb1x00_reg_write(ts->ucb, UCB_TS_CR, 0); | |
349 | ucb1x00_disable(ts->ucb); | |
acb45439 RK |
350 | } |
351 | ||
352 | #ifdef CONFIG_PM | |
353 | static int ucb1x00_ts_resume(struct ucb1x00_dev *dev) | |
354 | { | |
355 | struct ucb1x00_ts *ts = dev->priv; | |
356 | ||
357 | if (ts->rtask != NULL) { | |
358 | /* | |
359 | * Restart the TS thread to ensure the | |
360 | * TS interrupt mode is set up again | |
361 | * after sleep. | |
362 | */ | |
363 | ts->restart = 1; | |
364 | wake_up(&ts->irq_wait); | |
365 | } | |
366 | return 0; | |
367 | } | |
368 | #else | |
369 | #define ucb1x00_ts_resume NULL | |
370 | #endif | |
371 | ||
372 | ||
373 | /* | |
374 | * Initialisation. | |
375 | */ | |
376 | static int ucb1x00_ts_add(struct ucb1x00_dev *dev) | |
377 | { | |
378 | struct ucb1x00_ts *ts; | |
08c67d2a DT |
379 | struct input_dev *idev; |
380 | int err; | |
acb45439 | 381 | |
bd622663 | 382 | ts = kzalloc(sizeof(struct ucb1x00_ts), GFP_KERNEL); |
08c67d2a DT |
383 | idev = input_allocate_device(); |
384 | if (!ts || !idev) { | |
385 | err = -ENOMEM; | |
386 | goto fail; | |
bd622663 | 387 | } |
acb45439 RK |
388 | |
389 | ts->ucb = dev->ucb; | |
08c67d2a | 390 | ts->idev = idev; |
acb45439 | 391 | ts->adcsync = adcsync ? UCB_SYNC : UCB_NOSYNC; |
acb45439 | 392 | |
08c67d2a DT |
393 | idev->private = ts; |
394 | idev->name = "Touchscreen panel"; | |
395 | idev->id.product = ts->ucb->id; | |
396 | idev->open = ucb1x00_ts_open; | |
397 | idev->close = ucb1x00_ts_close; | |
acb45439 | 398 | |
08c67d2a DT |
399 | __set_bit(EV_ABS, idev->evbit); |
400 | __set_bit(ABS_X, idev->absbit); | |
401 | __set_bit(ABS_Y, idev->absbit); | |
402 | __set_bit(ABS_PRESSURE, idev->absbit); | |
acb45439 | 403 | |
08c67d2a DT |
404 | err = input_register_device(idev); |
405 | if (err) | |
406 | goto fail; | |
acb45439 RK |
407 | |
408 | dev->priv = ts; | |
409 | ||
410 | return 0; | |
08c67d2a DT |
411 | |
412 | fail: | |
413 | input_free_device(idev); | |
414 | kfree(ts); | |
415 | return err; | |
acb45439 RK |
416 | } |
417 | ||
418 | static void ucb1x00_ts_remove(struct ucb1x00_dev *dev) | |
419 | { | |
420 | struct ucb1x00_ts *ts = dev->priv; | |
bd622663 DT |
421 | |
422 | input_unregister_device(ts->idev); | |
acb45439 RK |
423 | kfree(ts); |
424 | } | |
425 | ||
426 | static struct ucb1x00_driver ucb1x00_ts_driver = { | |
427 | .add = ucb1x00_ts_add, | |
428 | .remove = ucb1x00_ts_remove, | |
429 | .resume = ucb1x00_ts_resume, | |
430 | }; | |
431 | ||
432 | static int __init ucb1x00_ts_init(void) | |
433 | { | |
434 | return ucb1x00_register_driver(&ucb1x00_ts_driver); | |
435 | } | |
436 | ||
437 | static void __exit ucb1x00_ts_exit(void) | |
438 | { | |
439 | ucb1x00_unregister_driver(&ucb1x00_ts_driver); | |
440 | } | |
441 | ||
442 | module_param(adcsync, int, 0444); | |
443 | module_init(ucb1x00_ts_init); | |
444 | module_exit(ucb1x00_ts_exit); | |
445 | ||
446 | MODULE_AUTHOR("Russell King <rmk@arm.linux.org.uk>"); | |
447 | MODULE_DESCRIPTION("UCB1x00 touchscreen driver"); | |
448 | MODULE_LICENSE("GPL"); |