Commit | Line | Data |
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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 | */ | |
20 | #include <linux/config.h> | |
21 | #include <linux/module.h> | |
22 | #include <linux/moduleparam.h> | |
23 | #include <linux/init.h> | |
24 | #include <linux/smp.h> | |
25 | #include <linux/smp_lock.h> | |
26 | #include <linux/sched.h> | |
27 | #include <linux/completion.h> | |
28 | #include <linux/delay.h> | |
29 | #include <linux/string.h> | |
30 | #include <linux/input.h> | |
31 | #include <linux/device.h> | |
32 | #include <linux/suspend.h> | |
33 | #include <linux/slab.h> | |
5437775e | 34 | #include <linux/kthread.h> |
acb45439 RK |
35 | |
36 | #include <asm/dma.h> | |
37 | #include <asm/semaphore.h> | |
17532989 PM |
38 | #include <asm/arch/collie.h> |
39 | #include <asm/mach-types.h> | |
acb45439 RK |
40 | |
41 | #include "ucb1x00.h" | |
42 | ||
43 | ||
44 | struct ucb1x00_ts { | |
bd622663 | 45 | struct input_dev *idev; |
acb45439 RK |
46 | struct ucb1x00 *ucb; |
47 | ||
48 | wait_queue_head_t irq_wait; | |
acb45439 | 49 | struct task_struct *rtask; |
acb45439 RK |
50 | u16 x_res; |
51 | u16 y_res; | |
52 | ||
6b9ea421 RK |
53 | unsigned int restart:1; |
54 | unsigned int adcsync:1; | |
acb45439 RK |
55 | }; |
56 | ||
57 | static int adcsync; | |
58 | ||
59 | static inline void ucb1x00_ts_evt_add(struct ucb1x00_ts *ts, u16 pressure, u16 x, u16 y) | |
60 | { | |
1393c3ed NP |
61 | struct input_dev *idev = ts->idev; |
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 NP |
70 | struct input_dev *idev = ts->idev; |
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); | |
193 | if (machine_is_collie()) | |
194 | return (!(val & (UCB_TS_CR_TSPX_LOW))); | |
195 | else | |
196 | return (val & (UCB_TS_CR_TSPX_LOW | UCB_TS_CR_TSMX_LOW)); | |
197 | } | |
198 | ||
acb45439 RK |
199 | /* |
200 | * This is a RT kernel thread that handles the ADC accesses | |
201 | * (mainly so we can use semaphores in the UCB1200 core code | |
202 | * to serialise accesses to the ADC). | |
203 | */ | |
204 | static int ucb1x00_thread(void *_ts) | |
205 | { | |
206 | struct ucb1x00_ts *ts = _ts; | |
207 | struct task_struct *tsk = current; | |
208 | DECLARE_WAITQUEUE(wait, tsk); | |
209 | int valid; | |
210 | ||
acb45439 RK |
211 | /* |
212 | * We could run as a real-time thread. However, thus far | |
213 | * this doesn't seem to be necessary. | |
214 | */ | |
215 | // tsk->policy = SCHED_FIFO; | |
216 | // tsk->rt_priority = 1; | |
217 | ||
acb45439 RK |
218 | valid = 0; |
219 | ||
220 | add_wait_queue(&ts->irq_wait, &wait); | |
5437775e | 221 | while (!kthread_should_stop()) { |
17532989 | 222 | unsigned int x, y, p; |
acb45439 RK |
223 | signed long timeout; |
224 | ||
225 | ts->restart = 0; | |
226 | ||
227 | ucb1x00_adc_enable(ts->ucb); | |
228 | ||
229 | x = ucb1x00_ts_read_xpos(ts); | |
230 | y = ucb1x00_ts_read_ypos(ts); | |
231 | p = ucb1x00_ts_read_pressure(ts); | |
232 | ||
233 | /* | |
234 | * Switch back to interrupt mode. | |
235 | */ | |
236 | ucb1x00_ts_mode_int(ts); | |
237 | ucb1x00_adc_disable(ts->ucb); | |
238 | ||
5437775e | 239 | msleep(10); |
acb45439 RK |
240 | |
241 | ucb1x00_enable(ts->ucb); | |
acb45439 | 242 | |
17532989 PM |
243 | |
244 | if (ucb1x00_ts_pen_down(ts)) { | |
acb45439 RK |
245 | set_task_state(tsk, TASK_INTERRUPTIBLE); |
246 | ||
17532989 | 247 | ucb1x00_enable_irq(ts->ucb, UCB_IRQ_TSPX, machine_is_collie() ? UCB_RISING : UCB_FALLING); |
acb45439 RK |
248 | ucb1x00_disable(ts->ucb); |
249 | ||
250 | /* | |
251 | * If we spat out a valid sample set last time, | |
252 | * spit out a "pen off" sample here. | |
253 | */ | |
254 | if (valid) { | |
255 | ucb1x00_ts_event_release(ts); | |
256 | valid = 0; | |
257 | } | |
258 | ||
259 | timeout = MAX_SCHEDULE_TIMEOUT; | |
260 | } else { | |
261 | ucb1x00_disable(ts->ucb); | |
262 | ||
263 | /* | |
264 | * Filtering is policy. Policy belongs in user | |
265 | * space. We therefore leave it to user space | |
266 | * to do any filtering they please. | |
267 | */ | |
268 | if (!ts->restart) { | |
269 | ucb1x00_ts_evt_add(ts, p, x, y); | |
270 | valid = 1; | |
271 | } | |
272 | ||
273 | set_task_state(tsk, TASK_INTERRUPTIBLE); | |
274 | timeout = HZ / 100; | |
275 | } | |
276 | ||
277 | try_to_freeze(); | |
278 | ||
279 | schedule_timeout(timeout); | |
acb45439 RK |
280 | } |
281 | ||
282 | remove_wait_queue(&ts->irq_wait, &wait); | |
283 | ||
284 | ts->rtask = NULL; | |
5437775e | 285 | return 0; |
acb45439 RK |
286 | } |
287 | ||
288 | /* | |
289 | * We only detect touch screen _touches_ with this interrupt | |
290 | * handler, and even then we just schedule our task. | |
291 | */ | |
292 | static void ucb1x00_ts_irq(int idx, void *id) | |
293 | { | |
294 | struct ucb1x00_ts *ts = id; | |
295 | ucb1x00_disable_irq(ts->ucb, UCB_IRQ_TSPX, UCB_FALLING); | |
296 | wake_up(&ts->irq_wait); | |
297 | } | |
298 | ||
299 | static int ucb1x00_ts_open(struct input_dev *idev) | |
300 | { | |
1393c3ed | 301 | struct ucb1x00_ts *ts = idev->private; |
acb45439 RK |
302 | int ret = 0; |
303 | ||
5437775e | 304 | BUG_ON(ts->rtask); |
acb45439 RK |
305 | |
306 | init_waitqueue_head(&ts->irq_wait); | |
307 | ret = ucb1x00_hook_irq(ts->ucb, UCB_IRQ_TSPX, ucb1x00_ts_irq, ts); | |
308 | if (ret < 0) | |
309 | goto out; | |
310 | ||
311 | /* | |
312 | * If we do this at all, we should allow the user to | |
313 | * measure and read the X and Y resistance at any time. | |
314 | */ | |
315 | ucb1x00_adc_enable(ts->ucb); | |
316 | ts->x_res = ucb1x00_ts_read_xres(ts); | |
317 | ts->y_res = ucb1x00_ts_read_yres(ts); | |
318 | ucb1x00_adc_disable(ts->ucb); | |
319 | ||
5437775e PM |
320 | ts->rtask = kthread_run(ucb1x00_thread, ts, "ktsd"); |
321 | if (!IS_ERR(ts->rtask)) { | |
acb45439 RK |
322 | ret = 0; |
323 | } else { | |
324 | ucb1x00_free_irq(ts->ucb, UCB_IRQ_TSPX, ts); | |
5437775e PM |
325 | ts->rtask = NULL; |
326 | ret = -EFAULT; | |
acb45439 RK |
327 | } |
328 | ||
329 | out: | |
acb45439 RK |
330 | return ret; |
331 | } | |
332 | ||
333 | /* | |
334 | * Release touchscreen resources. Disable IRQs. | |
335 | */ | |
336 | static void ucb1x00_ts_close(struct input_dev *idev) | |
337 | { | |
1393c3ed | 338 | struct ucb1x00_ts *ts = idev->private; |
acb45439 | 339 | |
5437775e PM |
340 | if (ts->rtask) |
341 | kthread_stop(ts->rtask); | |
acb45439 | 342 | |
5437775e PM |
343 | ucb1x00_enable(ts->ucb); |
344 | ucb1x00_free_irq(ts->ucb, UCB_IRQ_TSPX, ts); | |
345 | ucb1x00_reg_write(ts->ucb, UCB_TS_CR, 0); | |
346 | ucb1x00_disable(ts->ucb); | |
acb45439 RK |
347 | } |
348 | ||
349 | #ifdef CONFIG_PM | |
350 | static int ucb1x00_ts_resume(struct ucb1x00_dev *dev) | |
351 | { | |
352 | struct ucb1x00_ts *ts = dev->priv; | |
353 | ||
354 | if (ts->rtask != NULL) { | |
355 | /* | |
356 | * Restart the TS thread to ensure the | |
357 | * TS interrupt mode is set up again | |
358 | * after sleep. | |
359 | */ | |
360 | ts->restart = 1; | |
361 | wake_up(&ts->irq_wait); | |
362 | } | |
363 | return 0; | |
364 | } | |
365 | #else | |
366 | #define ucb1x00_ts_resume NULL | |
367 | #endif | |
368 | ||
369 | ||
370 | /* | |
371 | * Initialisation. | |
372 | */ | |
373 | static int ucb1x00_ts_add(struct ucb1x00_dev *dev) | |
374 | { | |
375 | struct ucb1x00_ts *ts; | |
376 | ||
bd622663 | 377 | ts = kzalloc(sizeof(struct ucb1x00_ts), GFP_KERNEL); |
acb45439 RK |
378 | if (!ts) |
379 | return -ENOMEM; | |
380 | ||
bd622663 DT |
381 | ts->idev = input_allocate_device(); |
382 | if (!ts->idev) { | |
383 | kfree(ts); | |
384 | return -ENOMEM; | |
385 | } | |
acb45439 RK |
386 | |
387 | ts->ucb = dev->ucb; | |
388 | ts->adcsync = adcsync ? UCB_SYNC : UCB_NOSYNC; | |
acb45439 | 389 | |
1393c3ed | 390 | ts->idev->private = ts; |
bd622663 DT |
391 | ts->idev->name = "Touchscreen panel"; |
392 | ts->idev->id.product = ts->ucb->id; | |
393 | ts->idev->open = ucb1x00_ts_open; | |
394 | ts->idev->close = ucb1x00_ts_close; | |
acb45439 | 395 | |
bd622663 DT |
396 | __set_bit(EV_ABS, ts->idev->evbit); |
397 | __set_bit(ABS_X, ts->idev->absbit); | |
398 | __set_bit(ABS_Y, ts->idev->absbit); | |
399 | __set_bit(ABS_PRESSURE, ts->idev->absbit); | |
acb45439 | 400 | |
bd622663 | 401 | input_register_device(ts->idev); |
acb45439 RK |
402 | |
403 | dev->priv = ts; | |
404 | ||
405 | return 0; | |
406 | } | |
407 | ||
408 | static void ucb1x00_ts_remove(struct ucb1x00_dev *dev) | |
409 | { | |
410 | struct ucb1x00_ts *ts = dev->priv; | |
bd622663 DT |
411 | |
412 | input_unregister_device(ts->idev); | |
acb45439 RK |
413 | kfree(ts); |
414 | } | |
415 | ||
416 | static struct ucb1x00_driver ucb1x00_ts_driver = { | |
417 | .add = ucb1x00_ts_add, | |
418 | .remove = ucb1x00_ts_remove, | |
419 | .resume = ucb1x00_ts_resume, | |
420 | }; | |
421 | ||
422 | static int __init ucb1x00_ts_init(void) | |
423 | { | |
424 | return ucb1x00_register_driver(&ucb1x00_ts_driver); | |
425 | } | |
426 | ||
427 | static void __exit ucb1x00_ts_exit(void) | |
428 | { | |
429 | ucb1x00_unregister_driver(&ucb1x00_ts_driver); | |
430 | } | |
431 | ||
432 | module_param(adcsync, int, 0444); | |
433 | module_init(ucb1x00_ts_init); | |
434 | module_exit(ucb1x00_ts_exit); | |
435 | ||
436 | MODULE_AUTHOR("Russell King <rmk@arm.linux.org.uk>"); | |
437 | MODULE_DESCRIPTION("UCB1x00 touchscreen driver"); | |
438 | MODULE_LICENSE("GPL"); |