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