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