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> | |
a3364409 | 23 | #include <linux/interrupt.h> |
acb45439 | 24 | #include <linux/sched.h> |
a3364409 | 25 | #include <linux/spinlock.h> |
acb45439 RK |
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> |
c8602edf | 34 | #include <linux/mfd/ucb1x00.h> |
acb45439 | 35 | |
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 | ||
a3364409 RK |
45 | spinlock_t irq_lock; |
46 | unsigned irq_disabled; | |
acb45439 | 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 | 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); | |
de8c8b06 | 64 | input_report_key(idev, BTN_TOUCH, 1); |
1393c3ed | 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 | 72 | input_report_abs(idev, ABS_PRESSURE, 0); |
de8c8b06 | 73 | input_report_key(idev, BTN_TOUCH, 0); |
1393c3ed | 74 | input_sync(idev); |
acb45439 RK |
75 | } |
76 | ||
77 | /* | |
78 | * Switch to interrupt mode. | |
79 | */ | |
80 | static inline void ucb1x00_ts_mode_int(struct ucb1x00_ts *ts) | |
81 | { | |
82 | ucb1x00_reg_write(ts->ucb, UCB_TS_CR, | |
83 | UCB_TS_CR_TSMX_POW | UCB_TS_CR_TSPX_POW | | |
84 | UCB_TS_CR_TSMY_GND | UCB_TS_CR_TSPY_GND | | |
85 | UCB_TS_CR_MODE_INT); | |
86 | } | |
87 | ||
88 | /* | |
89 | * Switch to pressure mode, and read pressure. We don't need to wait | |
90 | * here, since both plates are being driven. | |
91 | */ | |
92 | static inline unsigned int ucb1x00_ts_read_pressure(struct ucb1x00_ts *ts) | |
93 | { | |
17532989 PM |
94 | if (machine_is_collie()) { |
95 | ucb1x00_io_write(ts->ucb, COLLIE_TC35143_GPIO_TBL_CHK, 0); | |
96 | ucb1x00_reg_write(ts->ucb, UCB_TS_CR, | |
97 | UCB_TS_CR_TSPX_POW | UCB_TS_CR_TSMX_POW | | |
98 | UCB_TS_CR_MODE_POS | UCB_TS_CR_BIAS_ENA); | |
99 | ||
100 | udelay(55); | |
101 | ||
102 | return ucb1x00_adc_read(ts->ucb, UCB_ADC_INP_AD2, ts->adcsync); | |
103 | } else { | |
104 | ucb1x00_reg_write(ts->ucb, UCB_TS_CR, | |
105 | UCB_TS_CR_TSMX_POW | UCB_TS_CR_TSPX_POW | | |
106 | UCB_TS_CR_TSMY_GND | UCB_TS_CR_TSPY_GND | | |
107 | UCB_TS_CR_MODE_PRES | UCB_TS_CR_BIAS_ENA); | |
108 | ||
109 | return ucb1x00_adc_read(ts->ucb, UCB_ADC_INP_TSPY, ts->adcsync); | |
110 | } | |
acb45439 RK |
111 | } |
112 | ||
113 | /* | |
114 | * Switch to X position mode and measure Y plate. We switch the plate | |
115 | * configuration in pressure mode, then switch to position mode. This | |
116 | * gives a faster response time. Even so, we need to wait about 55us | |
117 | * for things to stabilise. | |
118 | */ | |
119 | static inline unsigned int ucb1x00_ts_read_xpos(struct ucb1x00_ts *ts) | |
120 | { | |
17532989 PM |
121 | if (machine_is_collie()) |
122 | ucb1x00_io_write(ts->ucb, 0, COLLIE_TC35143_GPIO_TBL_CHK); | |
123 | else { | |
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 | ucb1x00_reg_write(ts->ucb, UCB_TS_CR, | |
128 | UCB_TS_CR_TSMX_GND | UCB_TS_CR_TSPX_POW | | |
129 | UCB_TS_CR_MODE_PRES | UCB_TS_CR_BIAS_ENA); | |
130 | } | |
acb45439 RK |
131 | ucb1x00_reg_write(ts->ucb, UCB_TS_CR, |
132 | UCB_TS_CR_TSMX_GND | UCB_TS_CR_TSPX_POW | | |
133 | UCB_TS_CR_MODE_POS | UCB_TS_CR_BIAS_ENA); | |
134 | ||
135 | udelay(55); | |
136 | ||
137 | return ucb1x00_adc_read(ts->ucb, UCB_ADC_INP_TSPY, ts->adcsync); | |
138 | } | |
139 | ||
140 | /* | |
141 | * Switch to Y position mode and measure X plate. We switch the plate | |
142 | * configuration in pressure mode, then switch to position mode. This | |
143 | * gives a faster response time. Even so, we need to wait about 55us | |
144 | * for things to stabilise. | |
145 | */ | |
146 | static inline unsigned int ucb1x00_ts_read_ypos(struct ucb1x00_ts *ts) | |
147 | { | |
17532989 PM |
148 | if (machine_is_collie()) |
149 | ucb1x00_io_write(ts->ucb, 0, COLLIE_TC35143_GPIO_TBL_CHK); | |
150 | else { | |
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 | ucb1x00_reg_write(ts->ucb, UCB_TS_CR, | |
155 | UCB_TS_CR_TSMY_GND | UCB_TS_CR_TSPY_POW | | |
156 | UCB_TS_CR_MODE_PRES | UCB_TS_CR_BIAS_ENA); | |
157 | } | |
158 | ||
acb45439 RK |
159 | ucb1x00_reg_write(ts->ucb, UCB_TS_CR, |
160 | UCB_TS_CR_TSMY_GND | UCB_TS_CR_TSPY_POW | | |
161 | UCB_TS_CR_MODE_POS | UCB_TS_CR_BIAS_ENA); | |
162 | ||
163 | udelay(55); | |
164 | ||
165 | return ucb1x00_adc_read(ts->ucb, UCB_ADC_INP_TSPX, ts->adcsync); | |
166 | } | |
167 | ||
168 | /* | |
169 | * Switch to X plate resistance mode. Set MX to ground, PX to | |
170 | * supply. Measure current. | |
171 | */ | |
172 | static inline unsigned int ucb1x00_ts_read_xres(struct ucb1x00_ts *ts) | |
173 | { | |
174 | ucb1x00_reg_write(ts->ucb, UCB_TS_CR, | |
175 | UCB_TS_CR_TSMX_GND | UCB_TS_CR_TSPX_POW | | |
176 | UCB_TS_CR_MODE_PRES | UCB_TS_CR_BIAS_ENA); | |
177 | return ucb1x00_adc_read(ts->ucb, 0, ts->adcsync); | |
178 | } | |
179 | ||
180 | /* | |
181 | * Switch to Y plate resistance mode. Set MY to ground, PY to | |
182 | * supply. Measure current. | |
183 | */ | |
184 | static inline unsigned int ucb1x00_ts_read_yres(struct ucb1x00_ts *ts) | |
185 | { | |
186 | ucb1x00_reg_write(ts->ucb, UCB_TS_CR, | |
187 | UCB_TS_CR_TSMY_GND | UCB_TS_CR_TSPY_POW | | |
188 | UCB_TS_CR_MODE_PRES | UCB_TS_CR_BIAS_ENA); | |
189 | return ucb1x00_adc_read(ts->ucb, 0, ts->adcsync); | |
190 | } | |
191 | ||
17532989 PM |
192 | static inline int ucb1x00_ts_pen_down(struct ucb1x00_ts *ts) |
193 | { | |
194 | unsigned int val = ucb1x00_reg_read(ts->ucb, UCB_TS_CR); | |
08c67d2a | 195 | |
17532989 PM |
196 | if (machine_is_collie()) |
197 | return (!(val & (UCB_TS_CR_TSPX_LOW))); | |
198 | else | |
199 | return (val & (UCB_TS_CR_TSPX_LOW | UCB_TS_CR_TSMX_LOW)); | |
200 | } | |
201 | ||
acb45439 RK |
202 | /* |
203 | * This is a RT kernel thread that handles the ADC accesses | |
204 | * (mainly so we can use semaphores in the UCB1200 core code | |
205 | * to serialise accesses to the ADC). | |
206 | */ | |
207 | static int ucb1x00_thread(void *_ts) | |
208 | { | |
209 | struct ucb1x00_ts *ts = _ts; | |
f7440b0e | 210 | DECLARE_WAITQUEUE(wait, current); |
0af5e4c3 | 211 | bool frozen, ignore = false; |
1124d5ca | 212 | int valid = 0; |
acb45439 | 213 | |
83144186 | 214 | set_freezable(); |
acb45439 | 215 | add_wait_queue(&ts->irq_wait, &wait); |
0af5e4c3 | 216 | while (!kthread_freezable_should_stop(&frozen)) { |
17532989 | 217 | unsigned int x, y, p; |
acb45439 RK |
218 | signed long timeout; |
219 | ||
0af5e4c3 RK |
220 | if (frozen) |
221 | ignore = true; | |
acb45439 RK |
222 | |
223 | ucb1x00_adc_enable(ts->ucb); | |
224 | ||
225 | x = ucb1x00_ts_read_xpos(ts); | |
226 | y = ucb1x00_ts_read_ypos(ts); | |
227 | p = ucb1x00_ts_read_pressure(ts); | |
228 | ||
229 | /* | |
230 | * Switch back to interrupt mode. | |
231 | */ | |
232 | ucb1x00_ts_mode_int(ts); | |
233 | ucb1x00_adc_disable(ts->ucb); | |
234 | ||
5437775e | 235 | msleep(10); |
acb45439 RK |
236 | |
237 | ucb1x00_enable(ts->ucb); | |
acb45439 | 238 | |
17532989 PM |
239 | |
240 | if (ucb1x00_ts_pen_down(ts)) { | |
f7440b0e | 241 | set_current_state(TASK_INTERRUPTIBLE); |
acb45439 | 242 | |
a3364409 RK |
243 | spin_lock_irq(&ts->irq_lock); |
244 | if (ts->irq_disabled) { | |
245 | ts->irq_disabled = 0; | |
246 | enable_irq(ts->ucb->irq_base + UCB_IRQ_TSPX); | |
247 | } | |
248 | spin_unlock_irq(&ts->irq_lock); | |
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 | */ | |
0af5e4c3 | 269 | if (!ignore) { |
acb45439 RK |
270 | ucb1x00_ts_evt_add(ts, p, x, y); |
271 | valid = 1; | |
272 | } | |
273 | ||
f7440b0e | 274 | set_current_state(TASK_INTERRUPTIBLE); |
acb45439 RK |
275 | timeout = HZ / 100; |
276 | } | |
277 | ||
acb45439 | 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 | */ | |
a3364409 | 291 | static irqreturn_t ucb1x00_ts_irq(int irq, void *id) |
acb45439 RK |
292 | { |
293 | struct ucb1x00_ts *ts = id; | |
08c67d2a | 294 | |
a3364409 RK |
295 | spin_lock(&ts->irq_lock); |
296 | ts->irq_disabled = 1; | |
297 | disable_irq_nosync(ts->ucb->irq_base + UCB_IRQ_TSPX); | |
298 | spin_unlock(&ts->irq_lock); | |
acb45439 | 299 | wake_up(&ts->irq_wait); |
a3364409 RK |
300 | |
301 | return IRQ_HANDLED; | |
acb45439 RK |
302 | } |
303 | ||
304 | static int ucb1x00_ts_open(struct input_dev *idev) | |
305 | { | |
26be5a50 | 306 | struct ucb1x00_ts *ts = input_get_drvdata(idev); |
a3364409 | 307 | unsigned long flags = 0; |
acb45439 RK |
308 | int ret = 0; |
309 | ||
5437775e | 310 | BUG_ON(ts->rtask); |
acb45439 | 311 | |
a3364409 RK |
312 | if (machine_is_collie()) |
313 | flags = IRQF_TRIGGER_RISING; | |
314 | else | |
315 | flags = IRQF_TRIGGER_FALLING; | |
316 | ||
317 | ts->irq_disabled = 0; | |
318 | ||
acb45439 | 319 | init_waitqueue_head(&ts->irq_wait); |
a3364409 RK |
320 | ret = request_irq(ts->ucb->irq_base + UCB_IRQ_TSPX, ucb1x00_ts_irq, |
321 | flags, "ucb1x00-ts", ts); | |
acb45439 RK |
322 | if (ret < 0) |
323 | goto out; | |
324 | ||
325 | /* | |
326 | * If we do this at all, we should allow the user to | |
327 | * measure and read the X and Y resistance at any time. | |
328 | */ | |
329 | ucb1x00_adc_enable(ts->ucb); | |
330 | ts->x_res = ucb1x00_ts_read_xres(ts); | |
331 | ts->y_res = ucb1x00_ts_read_yres(ts); | |
332 | ucb1x00_adc_disable(ts->ucb); | |
333 | ||
5437775e PM |
334 | ts->rtask = kthread_run(ucb1x00_thread, ts, "ktsd"); |
335 | if (!IS_ERR(ts->rtask)) { | |
acb45439 RK |
336 | ret = 0; |
337 | } else { | |
a3364409 | 338 | free_irq(ts->ucb->irq_base + UCB_IRQ_TSPX, ts); |
5437775e PM |
339 | ts->rtask = NULL; |
340 | ret = -EFAULT; | |
acb45439 RK |
341 | } |
342 | ||
343 | out: | |
acb45439 RK |
344 | return ret; |
345 | } | |
346 | ||
347 | /* | |
348 | * Release touchscreen resources. Disable IRQs. | |
349 | */ | |
350 | static void ucb1x00_ts_close(struct input_dev *idev) | |
351 | { | |
26be5a50 | 352 | struct ucb1x00_ts *ts = input_get_drvdata(idev); |
acb45439 | 353 | |
5437775e PM |
354 | if (ts->rtask) |
355 | kthread_stop(ts->rtask); | |
acb45439 | 356 | |
5437775e | 357 | ucb1x00_enable(ts->ucb); |
a3364409 | 358 | free_irq(ts->ucb->irq_base + UCB_IRQ_TSPX, ts); |
5437775e PM |
359 | ucb1x00_reg_write(ts->ucb, UCB_TS_CR, 0); |
360 | ucb1x00_disable(ts->ucb); | |
acb45439 RK |
361 | } |
362 | ||
acb45439 RK |
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; |
a3364409 | 383 | spin_lock_init(&ts->irq_lock); |
acb45439 | 384 | |
08c67d2a | 385 | idev->name = "Touchscreen panel"; |
65f2e753 | 386 | idev->id.product = ts->ucb->id; |
08c67d2a DT |
387 | idev->open = ucb1x00_ts_open; |
388 | idev->close = ucb1x00_ts_close; | |
945f6310 | 389 | idev->dev.parent = &ts->ucb->dev; |
acb45439 | 390 | |
de8c8b06 JF |
391 | idev->evbit[0] = BIT_MASK(EV_ABS) | BIT_MASK(EV_KEY); |
392 | idev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH); | |
acb45439 | 393 | |
26be5a50 DT |
394 | input_set_drvdata(idev, ts); |
395 | ||
9063f1f1 JF |
396 | ucb1x00_adc_enable(ts->ucb); |
397 | ts->x_res = ucb1x00_ts_read_xres(ts); | |
398 | ts->y_res = ucb1x00_ts_read_yres(ts); | |
399 | ucb1x00_adc_disable(ts->ucb); | |
400 | ||
401 | input_set_abs_params(idev, ABS_X, 0, ts->x_res, 0, 0); | |
402 | input_set_abs_params(idev, ABS_Y, 0, ts->y_res, 0, 0); | |
403 | input_set_abs_params(idev, ABS_PRESSURE, 0, 0, 0, 0); | |
404 | ||
08c67d2a DT |
405 | err = input_register_device(idev); |
406 | if (err) | |
407 | goto fail; | |
acb45439 RK |
408 | |
409 | dev->priv = ts; | |
410 | ||
411 | return 0; | |
08c67d2a DT |
412 | |
413 | fail: | |
414 | input_free_device(idev); | |
415 | kfree(ts); | |
416 | return err; | |
acb45439 RK |
417 | } |
418 | ||
419 | static void ucb1x00_ts_remove(struct ucb1x00_dev *dev) | |
420 | { | |
421 | struct ucb1x00_ts *ts = dev->priv; | |
bd622663 DT |
422 | |
423 | input_unregister_device(ts->idev); | |
acb45439 RK |
424 | kfree(ts); |
425 | } | |
426 | ||
427 | static struct ucb1x00_driver ucb1x00_ts_driver = { | |
428 | .add = ucb1x00_ts_add, | |
429 | .remove = ucb1x00_ts_remove, | |
acb45439 RK |
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"); |