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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> | |
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> |
c8602edf | 33 | #include <linux/mfd/ucb1x00.h> |
acb45439 | 34 | |
dcea83ad | 35 | #include <mach/dma.h> |
a09e64fb | 36 | #include <mach/collie.h> |
17532989 | 37 | #include <asm/mach-types.h> |
acb45439 | 38 | |
acb45439 RK |
39 | |
40 | ||
41 | struct ucb1x00_ts { | |
bd622663 | 42 | struct input_dev *idev; |
acb45439 RK |
43 | struct ucb1x00 *ucb; |
44 | ||
45 | wait_queue_head_t irq_wait; | |
acb45439 | 46 | struct task_struct *rtask; |
acb45439 RK |
47 | u16 x_res; |
48 | u16 y_res; | |
49 | ||
6b9ea421 RK |
50 | unsigned int restart:1; |
51 | unsigned int adcsync:1; | |
acb45439 RK |
52 | }; |
53 | ||
54 | static int adcsync; | |
55 | ||
56 | static inline void ucb1x00_ts_evt_add(struct ucb1x00_ts *ts, u16 pressure, u16 x, u16 y) | |
57 | { | |
1393c3ed | 58 | struct input_dev *idev = ts->idev; |
08c67d2a | 59 | |
1393c3ed NP |
60 | input_report_abs(idev, ABS_X, x); |
61 | input_report_abs(idev, ABS_Y, y); | |
62 | input_report_abs(idev, ABS_PRESSURE, pressure); | |
de8c8b06 | 63 | input_report_key(idev, BTN_TOUCH, 1); |
1393c3ed | 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 | 71 | input_report_abs(idev, ABS_PRESSURE, 0); |
de8c8b06 | 72 | input_report_key(idev, BTN_TOUCH, 0); |
1393c3ed | 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; | |
f7440b0e | 209 | DECLARE_WAITQUEUE(wait, current); |
1124d5ca | 210 | int valid = 0; |
acb45439 | 211 | |
83144186 | 212 | set_freezable(); |
acb45439 | 213 | add_wait_queue(&ts->irq_wait, &wait); |
5437775e | 214 | while (!kthread_should_stop()) { |
17532989 | 215 | unsigned int x, y, p; |
acb45439 RK |
216 | signed long timeout; |
217 | ||
218 | ts->restart = 0; | |
219 | ||
220 | ucb1x00_adc_enable(ts->ucb); | |
221 | ||
222 | x = ucb1x00_ts_read_xpos(ts); | |
223 | y = ucb1x00_ts_read_ypos(ts); | |
224 | p = ucb1x00_ts_read_pressure(ts); | |
225 | ||
226 | /* | |
227 | * Switch back to interrupt mode. | |
228 | */ | |
229 | ucb1x00_ts_mode_int(ts); | |
230 | ucb1x00_adc_disable(ts->ucb); | |
231 | ||
5437775e | 232 | msleep(10); |
acb45439 RK |
233 | |
234 | ucb1x00_enable(ts->ucb); | |
acb45439 | 235 | |
17532989 PM |
236 | |
237 | if (ucb1x00_ts_pen_down(ts)) { | |
f7440b0e | 238 | set_current_state(TASK_INTERRUPTIBLE); |
acb45439 | 239 | |
17532989 | 240 | ucb1x00_enable_irq(ts->ucb, UCB_IRQ_TSPX, machine_is_collie() ? UCB_RISING : UCB_FALLING); |
acb45439 RK |
241 | ucb1x00_disable(ts->ucb); |
242 | ||
243 | /* | |
244 | * If we spat out a valid sample set last time, | |
245 | * spit out a "pen off" sample here. | |
246 | */ | |
247 | if (valid) { | |
248 | ucb1x00_ts_event_release(ts); | |
249 | valid = 0; | |
250 | } | |
251 | ||
252 | timeout = MAX_SCHEDULE_TIMEOUT; | |
253 | } else { | |
254 | ucb1x00_disable(ts->ucb); | |
255 | ||
256 | /* | |
257 | * Filtering is policy. Policy belongs in user | |
258 | * space. We therefore leave it to user space | |
259 | * to do any filtering they please. | |
260 | */ | |
261 | if (!ts->restart) { | |
262 | ucb1x00_ts_evt_add(ts, p, x, y); | |
263 | valid = 1; | |
264 | } | |
265 | ||
f7440b0e | 266 | set_current_state(TASK_INTERRUPTIBLE); |
acb45439 RK |
267 | timeout = HZ / 100; |
268 | } | |
269 | ||
270 | try_to_freeze(); | |
271 | ||
272 | schedule_timeout(timeout); | |
acb45439 RK |
273 | } |
274 | ||
275 | remove_wait_queue(&ts->irq_wait, &wait); | |
276 | ||
277 | ts->rtask = NULL; | |
5437775e | 278 | return 0; |
acb45439 RK |
279 | } |
280 | ||
281 | /* | |
282 | * We only detect touch screen _touches_ with this interrupt | |
283 | * handler, and even then we just schedule our task. | |
284 | */ | |
285 | static void ucb1x00_ts_irq(int idx, void *id) | |
286 | { | |
287 | struct ucb1x00_ts *ts = id; | |
08c67d2a | 288 | |
acb45439 RK |
289 | ucb1x00_disable_irq(ts->ucb, UCB_IRQ_TSPX, UCB_FALLING); |
290 | wake_up(&ts->irq_wait); | |
291 | } | |
292 | ||
293 | static int ucb1x00_ts_open(struct input_dev *idev) | |
294 | { | |
26be5a50 | 295 | struct ucb1x00_ts *ts = input_get_drvdata(idev); |
acb45439 RK |
296 | int ret = 0; |
297 | ||
5437775e | 298 | BUG_ON(ts->rtask); |
acb45439 RK |
299 | |
300 | init_waitqueue_head(&ts->irq_wait); | |
301 | ret = ucb1x00_hook_irq(ts->ucb, UCB_IRQ_TSPX, ucb1x00_ts_irq, ts); | |
302 | if (ret < 0) | |
303 | goto out; | |
304 | ||
305 | /* | |
306 | * If we do this at all, we should allow the user to | |
307 | * measure and read the X and Y resistance at any time. | |
308 | */ | |
309 | ucb1x00_adc_enable(ts->ucb); | |
310 | ts->x_res = ucb1x00_ts_read_xres(ts); | |
311 | ts->y_res = ucb1x00_ts_read_yres(ts); | |
312 | ucb1x00_adc_disable(ts->ucb); | |
313 | ||
5437775e PM |
314 | ts->rtask = kthread_run(ucb1x00_thread, ts, "ktsd"); |
315 | if (!IS_ERR(ts->rtask)) { | |
acb45439 RK |
316 | ret = 0; |
317 | } else { | |
318 | ucb1x00_free_irq(ts->ucb, UCB_IRQ_TSPX, ts); | |
5437775e PM |
319 | ts->rtask = NULL; |
320 | ret = -EFAULT; | |
acb45439 RK |
321 | } |
322 | ||
323 | out: | |
acb45439 RK |
324 | return ret; |
325 | } | |
326 | ||
327 | /* | |
328 | * Release touchscreen resources. Disable IRQs. | |
329 | */ | |
330 | static void ucb1x00_ts_close(struct input_dev *idev) | |
331 | { | |
26be5a50 | 332 | struct ucb1x00_ts *ts = input_get_drvdata(idev); |
acb45439 | 333 | |
5437775e PM |
334 | if (ts->rtask) |
335 | kthread_stop(ts->rtask); | |
acb45439 | 336 | |
5437775e PM |
337 | ucb1x00_enable(ts->ucb); |
338 | ucb1x00_free_irq(ts->ucb, UCB_IRQ_TSPX, ts); | |
339 | ucb1x00_reg_write(ts->ucb, UCB_TS_CR, 0); | |
340 | ucb1x00_disable(ts->ucb); | |
acb45439 RK |
341 | } |
342 | ||
343 | #ifdef CONFIG_PM | |
344 | static int ucb1x00_ts_resume(struct ucb1x00_dev *dev) | |
345 | { | |
346 | struct ucb1x00_ts *ts = dev->priv; | |
347 | ||
348 | if (ts->rtask != NULL) { | |
349 | /* | |
350 | * Restart the TS thread to ensure the | |
351 | * TS interrupt mode is set up again | |
352 | * after sleep. | |
353 | */ | |
354 | ts->restart = 1; | |
355 | wake_up(&ts->irq_wait); | |
356 | } | |
357 | return 0; | |
358 | } | |
359 | #else | |
360 | #define ucb1x00_ts_resume NULL | |
361 | #endif | |
362 | ||
363 | ||
364 | /* | |
365 | * Initialisation. | |
366 | */ | |
367 | static int ucb1x00_ts_add(struct ucb1x00_dev *dev) | |
368 | { | |
369 | struct ucb1x00_ts *ts; | |
08c67d2a DT |
370 | struct input_dev *idev; |
371 | int err; | |
acb45439 | 372 | |
bd622663 | 373 | ts = kzalloc(sizeof(struct ucb1x00_ts), GFP_KERNEL); |
08c67d2a DT |
374 | idev = input_allocate_device(); |
375 | if (!ts || !idev) { | |
376 | err = -ENOMEM; | |
377 | goto fail; | |
bd622663 | 378 | } |
acb45439 RK |
379 | |
380 | ts->ucb = dev->ucb; | |
08c67d2a | 381 | ts->idev = idev; |
acb45439 | 382 | ts->adcsync = adcsync ? UCB_SYNC : UCB_NOSYNC; |
acb45439 | 383 | |
08c67d2a DT |
384 | idev->name = "Touchscreen panel"; |
385 | idev->id.product = ts->ucb->id; | |
386 | idev->open = ucb1x00_ts_open; | |
387 | idev->close = ucb1x00_ts_close; | |
acb45439 | 388 | |
de8c8b06 JF |
389 | idev->evbit[0] = BIT_MASK(EV_ABS) | BIT_MASK(EV_KEY); |
390 | idev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH); | |
acb45439 | 391 | |
26be5a50 DT |
392 | input_set_drvdata(idev, ts); |
393 | ||
9063f1f1 JF |
394 | ucb1x00_adc_enable(ts->ucb); |
395 | ts->x_res = ucb1x00_ts_read_xres(ts); | |
396 | ts->y_res = ucb1x00_ts_read_yres(ts); | |
397 | ucb1x00_adc_disable(ts->ucb); | |
398 | ||
399 | input_set_abs_params(idev, ABS_X, 0, ts->x_res, 0, 0); | |
400 | input_set_abs_params(idev, ABS_Y, 0, ts->y_res, 0, 0); | |
401 | input_set_abs_params(idev, ABS_PRESSURE, 0, 0, 0, 0); | |
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"); |