Commit | Line | Data |
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d2912cb1 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
acb45439 | 2 | /* |
5437775e | 3 | * Touchscreen driver for UCB1x00-based touchscreens |
acb45439 RK |
4 | * |
5 | * Copyright (C) 2001 Russell King, All Rights Reserved. | |
5437775e | 6 | * Copyright (C) 2005 Pavel Machek |
acb45439 | 7 | * |
acb45439 RK |
8 | * 21-Jan-2002 <jco@ict.es> : |
9 | * | |
10 | * Added support for synchronous A/D mode. This mode is useful to | |
11 | * avoid noise induced in the touchpanel by the LCD, provided that | |
12 | * the UCB1x00 has a valid LCD sync signal routed to its ADCSYNC pin. | |
13 | * It is important to note that the signal connected to the ADCSYNC | |
14 | * pin should provide pulses even when the LCD is blanked, otherwise | |
15 | * a pen touch needed to unblank the LCD will never be read. | |
16 | */ | |
acb45439 RK |
17 | #include <linux/module.h> |
18 | #include <linux/moduleparam.h> | |
19 | #include <linux/init.h> | |
a3364409 | 20 | #include <linux/interrupt.h> |
acb45439 | 21 | #include <linux/sched.h> |
a3364409 | 22 | #include <linux/spinlock.h> |
acb45439 RK |
23 | #include <linux/completion.h> |
24 | #include <linux/delay.h> | |
25 | #include <linux/string.h> | |
26 | #include <linux/input.h> | |
27 | #include <linux/device.h> | |
7dfb7103 | 28 | #include <linux/freezer.h> |
acb45439 | 29 | #include <linux/slab.h> |
5437775e | 30 | #include <linux/kthread.h> |
c8602edf | 31 | #include <linux/mfd/ucb1x00.h> |
acb45439 | 32 | |
a09e64fb | 33 | #include <mach/collie.h> |
17532989 | 34 | #include <asm/mach-types.h> |
acb45439 | 35 | |
acb45439 RK |
36 | |
37 | ||
38 | struct ucb1x00_ts { | |
bd622663 | 39 | struct input_dev *idev; |
acb45439 RK |
40 | struct ucb1x00 *ucb; |
41 | ||
a3364409 RK |
42 | spinlock_t irq_lock; |
43 | unsigned irq_disabled; | |
acb45439 | 44 | wait_queue_head_t irq_wait; |
acb45439 | 45 | struct task_struct *rtask; |
acb45439 RK |
46 | u16 x_res; |
47 | u16 y_res; | |
48 | ||
6b9ea421 | 49 | unsigned int adcsync:1; |
acb45439 RK |
50 | }; |
51 | ||
52 | static int adcsync; | |
53 | ||
54 | static inline void ucb1x00_ts_evt_add(struct ucb1x00_ts *ts, u16 pressure, u16 x, u16 y) | |
55 | { | |
1393c3ed | 56 | struct input_dev *idev = ts->idev; |
08c67d2a | 57 | |
1393c3ed NP |
58 | input_report_abs(idev, ABS_X, x); |
59 | input_report_abs(idev, ABS_Y, y); | |
60 | input_report_abs(idev, ABS_PRESSURE, pressure); | |
de8c8b06 | 61 | input_report_key(idev, BTN_TOUCH, 1); |
1393c3ed | 62 | input_sync(idev); |
acb45439 RK |
63 | } |
64 | ||
65 | static inline void ucb1x00_ts_event_release(struct ucb1x00_ts *ts) | |
66 | { | |
1393c3ed | 67 | struct input_dev *idev = ts->idev; |
08c67d2a | 68 | |
1393c3ed | 69 | input_report_abs(idev, ABS_PRESSURE, 0); |
de8c8b06 | 70 | input_report_key(idev, BTN_TOUCH, 0); |
1393c3ed | 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); | |
08c67d2a | 192 | |
17532989 PM |
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; | |
f7440b0e | 207 | DECLARE_WAITQUEUE(wait, current); |
0af5e4c3 | 208 | bool frozen, ignore = false; |
1124d5ca | 209 | int valid = 0; |
acb45439 | 210 | |
83144186 | 211 | set_freezable(); |
acb45439 | 212 | add_wait_queue(&ts->irq_wait, &wait); |
0af5e4c3 | 213 | while (!kthread_freezable_should_stop(&frozen)) { |
17532989 | 214 | unsigned int x, y, p; |
acb45439 RK |
215 | signed long timeout; |
216 | ||
0af5e4c3 RK |
217 | if (frozen) |
218 | ignore = true; | |
acb45439 RK |
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 | |
a3364409 RK |
240 | spin_lock_irq(&ts->irq_lock); |
241 | if (ts->irq_disabled) { | |
242 | ts->irq_disabled = 0; | |
243 | enable_irq(ts->ucb->irq_base + UCB_IRQ_TSPX); | |
244 | } | |
245 | spin_unlock_irq(&ts->irq_lock); | |
acb45439 RK |
246 | ucb1x00_disable(ts->ucb); |
247 | ||
248 | /* | |
249 | * If we spat out a valid sample set last time, | |
250 | * spit out a "pen off" sample here. | |
251 | */ | |
252 | if (valid) { | |
253 | ucb1x00_ts_event_release(ts); | |
254 | valid = 0; | |
255 | } | |
256 | ||
257 | timeout = MAX_SCHEDULE_TIMEOUT; | |
258 | } else { | |
259 | ucb1x00_disable(ts->ucb); | |
260 | ||
261 | /* | |
262 | * Filtering is policy. Policy belongs in user | |
263 | * space. We therefore leave it to user space | |
264 | * to do any filtering they please. | |
265 | */ | |
0af5e4c3 | 266 | if (!ignore) { |
acb45439 RK |
267 | ucb1x00_ts_evt_add(ts, p, x, y); |
268 | valid = 1; | |
269 | } | |
270 | ||
f7440b0e | 271 | set_current_state(TASK_INTERRUPTIBLE); |
acb45439 RK |
272 | timeout = HZ / 100; |
273 | } | |
274 | ||
acb45439 | 275 | schedule_timeout(timeout); |
acb45439 RK |
276 | } |
277 | ||
278 | remove_wait_queue(&ts->irq_wait, &wait); | |
279 | ||
280 | ts->rtask = NULL; | |
5437775e | 281 | return 0; |
acb45439 RK |
282 | } |
283 | ||
284 | /* | |
285 | * We only detect touch screen _touches_ with this interrupt | |
286 | * handler, and even then we just schedule our task. | |
287 | */ | |
a3364409 | 288 | static irqreturn_t ucb1x00_ts_irq(int irq, void *id) |
acb45439 RK |
289 | { |
290 | struct ucb1x00_ts *ts = id; | |
08c67d2a | 291 | |
a3364409 RK |
292 | spin_lock(&ts->irq_lock); |
293 | ts->irq_disabled = 1; | |
294 | disable_irq_nosync(ts->ucb->irq_base + UCB_IRQ_TSPX); | |
295 | spin_unlock(&ts->irq_lock); | |
acb45439 | 296 | wake_up(&ts->irq_wait); |
a3364409 RK |
297 | |
298 | return IRQ_HANDLED; | |
acb45439 RK |
299 | } |
300 | ||
301 | static int ucb1x00_ts_open(struct input_dev *idev) | |
302 | { | |
26be5a50 | 303 | struct ucb1x00_ts *ts = input_get_drvdata(idev); |
a3364409 | 304 | unsigned long flags = 0; |
acb45439 RK |
305 | int ret = 0; |
306 | ||
5437775e | 307 | BUG_ON(ts->rtask); |
acb45439 | 308 | |
a3364409 RK |
309 | if (machine_is_collie()) |
310 | flags = IRQF_TRIGGER_RISING; | |
311 | else | |
312 | flags = IRQF_TRIGGER_FALLING; | |
313 | ||
314 | ts->irq_disabled = 0; | |
315 | ||
acb45439 | 316 | init_waitqueue_head(&ts->irq_wait); |
a3364409 RK |
317 | ret = request_irq(ts->ucb->irq_base + UCB_IRQ_TSPX, ucb1x00_ts_irq, |
318 | flags, "ucb1x00-ts", ts); | |
acb45439 RK |
319 | if (ret < 0) |
320 | goto out; | |
321 | ||
322 | /* | |
323 | * If we do this at all, we should allow the user to | |
324 | * measure and read the X and Y resistance at any time. | |
325 | */ | |
326 | ucb1x00_adc_enable(ts->ucb); | |
327 | ts->x_res = ucb1x00_ts_read_xres(ts); | |
328 | ts->y_res = ucb1x00_ts_read_yres(ts); | |
329 | ucb1x00_adc_disable(ts->ucb); | |
330 | ||
5437775e PM |
331 | ts->rtask = kthread_run(ucb1x00_thread, ts, "ktsd"); |
332 | if (!IS_ERR(ts->rtask)) { | |
acb45439 RK |
333 | ret = 0; |
334 | } else { | |
a3364409 | 335 | free_irq(ts->ucb->irq_base + UCB_IRQ_TSPX, ts); |
5437775e PM |
336 | ts->rtask = NULL; |
337 | ret = -EFAULT; | |
acb45439 RK |
338 | } |
339 | ||
340 | out: | |
acb45439 RK |
341 | return ret; |
342 | } | |
343 | ||
344 | /* | |
345 | * Release touchscreen resources. Disable IRQs. | |
346 | */ | |
347 | static void ucb1x00_ts_close(struct input_dev *idev) | |
348 | { | |
26be5a50 | 349 | struct ucb1x00_ts *ts = input_get_drvdata(idev); |
acb45439 | 350 | |
5437775e PM |
351 | if (ts->rtask) |
352 | kthread_stop(ts->rtask); | |
acb45439 | 353 | |
5437775e | 354 | ucb1x00_enable(ts->ucb); |
a3364409 | 355 | free_irq(ts->ucb->irq_base + UCB_IRQ_TSPX, ts); |
5437775e PM |
356 | ucb1x00_reg_write(ts->ucb, UCB_TS_CR, 0); |
357 | ucb1x00_disable(ts->ucb); | |
acb45439 RK |
358 | } |
359 | ||
acb45439 RK |
360 | |
361 | /* | |
362 | * Initialisation. | |
363 | */ | |
364 | static int ucb1x00_ts_add(struct ucb1x00_dev *dev) | |
365 | { | |
366 | struct ucb1x00_ts *ts; | |
08c67d2a DT |
367 | struct input_dev *idev; |
368 | int err; | |
acb45439 | 369 | |
bd622663 | 370 | ts = kzalloc(sizeof(struct ucb1x00_ts), GFP_KERNEL); |
08c67d2a DT |
371 | idev = input_allocate_device(); |
372 | if (!ts || !idev) { | |
373 | err = -ENOMEM; | |
374 | goto fail; | |
bd622663 | 375 | } |
acb45439 RK |
376 | |
377 | ts->ucb = dev->ucb; | |
08c67d2a | 378 | ts->idev = idev; |
acb45439 | 379 | ts->adcsync = adcsync ? UCB_SYNC : UCB_NOSYNC; |
a3364409 | 380 | spin_lock_init(&ts->irq_lock); |
acb45439 | 381 | |
08c67d2a | 382 | idev->name = "Touchscreen panel"; |
65f2e753 | 383 | idev->id.product = ts->ucb->id; |
08c67d2a DT |
384 | idev->open = ucb1x00_ts_open; |
385 | idev->close = ucb1x00_ts_close; | |
945f6310 | 386 | idev->dev.parent = &ts->ucb->dev; |
acb45439 | 387 | |
de8c8b06 JF |
388 | idev->evbit[0] = BIT_MASK(EV_ABS) | BIT_MASK(EV_KEY); |
389 | idev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH); | |
acb45439 | 390 | |
26be5a50 DT |
391 | input_set_drvdata(idev, ts); |
392 | ||
9063f1f1 JF |
393 | ucb1x00_adc_enable(ts->ucb); |
394 | ts->x_res = ucb1x00_ts_read_xres(ts); | |
395 | ts->y_res = ucb1x00_ts_read_yres(ts); | |
396 | ucb1x00_adc_disable(ts->ucb); | |
397 | ||
398 | input_set_abs_params(idev, ABS_X, 0, ts->x_res, 0, 0); | |
399 | input_set_abs_params(idev, ABS_Y, 0, ts->y_res, 0, 0); | |
400 | input_set_abs_params(idev, ABS_PRESSURE, 0, 0, 0, 0); | |
401 | ||
08c67d2a DT |
402 | err = input_register_device(idev); |
403 | if (err) | |
404 | goto fail; | |
acb45439 RK |
405 | |
406 | dev->priv = ts; | |
407 | ||
408 | return 0; | |
08c67d2a DT |
409 | |
410 | fail: | |
411 | input_free_device(idev); | |
412 | kfree(ts); | |
413 | return err; | |
acb45439 RK |
414 | } |
415 | ||
416 | static void ucb1x00_ts_remove(struct ucb1x00_dev *dev) | |
417 | { | |
418 | struct ucb1x00_ts *ts = dev->priv; | |
bd622663 DT |
419 | |
420 | input_unregister_device(ts->idev); | |
acb45439 RK |
421 | kfree(ts); |
422 | } | |
423 | ||
424 | static struct ucb1x00_driver ucb1x00_ts_driver = { | |
425 | .add = ucb1x00_ts_add, | |
426 | .remove = ucb1x00_ts_remove, | |
acb45439 RK |
427 | }; |
428 | ||
429 | static int __init ucb1x00_ts_init(void) | |
430 | { | |
431 | return ucb1x00_register_driver(&ucb1x00_ts_driver); | |
432 | } | |
433 | ||
434 | static void __exit ucb1x00_ts_exit(void) | |
435 | { | |
436 | ucb1x00_unregister_driver(&ucb1x00_ts_driver); | |
437 | } | |
438 | ||
439 | module_param(adcsync, int, 0444); | |
440 | module_init(ucb1x00_ts_init); | |
441 | module_exit(ucb1x00_ts_exit); | |
442 | ||
443 | MODULE_AUTHOR("Russell King <rmk@arm.linux.org.uk>"); | |
444 | MODULE_DESCRIPTION("UCB1x00 touchscreen driver"); | |
445 | MODULE_LICENSE("GPL"); |