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mtd: nand_base: use __func__ instead of typing names
[linux/fpc-iii.git] / drivers / input / touchscreen / ucb1400_ts.c
blob3a7a58222f836ed5c9aea5022a1196482c7ee355
1 /*
2 * Philips UCB1400 touchscreen driver
3 *
4 * Author: Nicolas Pitre
5 * Created: September 25, 2006
6 * Copyright: MontaVista Software, Inc.
7 *
8 * Spliting done by: Marek Vasut <marek.vasut@gmail.com>
9 * If something doesnt work and it worked before spliting, e-mail me,
10 * dont bother Nicolas please ;-)
11 *
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License version 2 as
14 * published by the Free Software Foundation.
15 *
16 * This code is heavily based on ucb1x00-*.c copyrighted by Russell King
17 * covering the UCB1100, UCB1200 and UCB1300.. Support for the UCB1400 has
18 * been made separate from ucb1x00-core/ucb1x00-ts on Russell's request.
19 */
20
21 #include <linux/module.h>
22 #include <linux/init.h>
23 #include <linux/completion.h>
24 #include <linux/delay.h>
25 #include <linux/input.h>
26 #include <linux/device.h>
27 #include <linux/interrupt.h>
28 #include <linux/suspend.h>
29 #include <linux/slab.h>
30 #include <linux/kthread.h>
31 #include <linux/freezer.h>
32 #include <linux/ucb1400.h>
33
34 static int adcsync;
35 static int ts_delay = 55; /* us */
36 static int ts_delay_pressure; /* us */
37
38 /* Switch to interrupt mode. */
39 static inline void ucb1400_ts_mode_int(struct snd_ac97 *ac97)
40 {
41 ucb1400_reg_write(ac97, UCB_TS_CR,
42 UCB_TS_CR_TSMX_POW | UCB_TS_CR_TSPX_POW |
43 UCB_TS_CR_TSMY_GND | UCB_TS_CR_TSPY_GND |
44 UCB_TS_CR_MODE_INT);
45 }
46
47 /*
48 * Switch to pressure mode, and read pressure. We don't need to wait
49 * here, since both plates are being driven.
50 */
51 static inline unsigned int ucb1400_ts_read_pressure(struct ucb1400_ts *ucb)
52 {
53 ucb1400_reg_write(ucb->ac97, UCB_TS_CR,
54 UCB_TS_CR_TSMX_POW | UCB_TS_CR_TSPX_POW |
55 UCB_TS_CR_TSMY_GND | UCB_TS_CR_TSPY_GND |
56 UCB_TS_CR_MODE_PRES | UCB_TS_CR_BIAS_ENA);
57 udelay(ts_delay_pressure);
58 return ucb1400_adc_read(ucb->ac97, UCB_ADC_INP_TSPY, adcsync);
59 }
60
61 /*
62 * Switch to X position mode and measure Y plate. We switch the plate
63 * configuration in pressure mode, then switch to position mode. This
64 * gives a faster response time. Even so, we need to wait about 55us
65 * for things to stabilise.
66 */
67 static inline unsigned int ucb1400_ts_read_xpos(struct ucb1400_ts *ucb)
68 {
69 ucb1400_reg_write(ucb->ac97, UCB_TS_CR,
70 UCB_TS_CR_TSMX_GND | UCB_TS_CR_TSPX_POW |
71 UCB_TS_CR_MODE_PRES | UCB_TS_CR_BIAS_ENA);
72 ucb1400_reg_write(ucb->ac97, UCB_TS_CR,
73 UCB_TS_CR_TSMX_GND | UCB_TS_CR_TSPX_POW |
74 UCB_TS_CR_MODE_PRES | UCB_TS_CR_BIAS_ENA);
75 ucb1400_reg_write(ucb->ac97, UCB_TS_CR,
76 UCB_TS_CR_TSMX_GND | UCB_TS_CR_TSPX_POW |
77 UCB_TS_CR_MODE_POS | UCB_TS_CR_BIAS_ENA);
78
79 udelay(ts_delay);
80
81 return ucb1400_adc_read(ucb->ac97, UCB_ADC_INP_TSPY, adcsync);
82 }
83
84 /*
85 * Switch to Y position mode and measure X plate. We switch the plate
86 * configuration in pressure mode, then switch to position mode. This
87 * gives a faster response time. Even so, we need to wait about 55us
88 * for things to stabilise.
89 */
90 static inline unsigned int ucb1400_ts_read_ypos(struct ucb1400_ts *ucb)
91 {
92 ucb1400_reg_write(ucb->ac97, UCB_TS_CR,
93 UCB_TS_CR_TSMY_GND | UCB_TS_CR_TSPY_POW |
94 UCB_TS_CR_MODE_PRES | UCB_TS_CR_BIAS_ENA);
95 ucb1400_reg_write(ucb->ac97, UCB_TS_CR,
96 UCB_TS_CR_TSMY_GND | UCB_TS_CR_TSPY_POW |
97 UCB_TS_CR_MODE_PRES | UCB_TS_CR_BIAS_ENA);
98 ucb1400_reg_write(ucb->ac97, UCB_TS_CR,
99 UCB_TS_CR_TSMY_GND | UCB_TS_CR_TSPY_POW |
100 UCB_TS_CR_MODE_POS | UCB_TS_CR_BIAS_ENA);
101
102 udelay(ts_delay);
103
104 return ucb1400_adc_read(ucb->ac97, UCB_ADC_INP_TSPX, adcsync);
105 }
106
107 /*
108 * Switch to X plate resistance mode. Set MX to ground, PX to
109 * supply. Measure current.
110 */
111 static inline unsigned int ucb1400_ts_read_xres(struct ucb1400_ts *ucb)
112 {
113 ucb1400_reg_write(ucb->ac97, UCB_TS_CR,
114 UCB_TS_CR_TSMX_GND | UCB_TS_CR_TSPX_POW |
115 UCB_TS_CR_MODE_PRES | UCB_TS_CR_BIAS_ENA);
116 return ucb1400_adc_read(ucb->ac97, 0, adcsync);
117 }
118
119 /*
120 * Switch to Y plate resistance mode. Set MY to ground, PY to
121 * supply. Measure current.
122 */
123 static inline unsigned int ucb1400_ts_read_yres(struct ucb1400_ts *ucb)
124 {
125 ucb1400_reg_write(ucb->ac97, UCB_TS_CR,
126 UCB_TS_CR_TSMY_GND | UCB_TS_CR_TSPY_POW |
127 UCB_TS_CR_MODE_PRES | UCB_TS_CR_BIAS_ENA);
128 return ucb1400_adc_read(ucb->ac97, 0, adcsync);
129 }
130
131 static inline int ucb1400_ts_pen_down(struct snd_ac97 *ac97)
132 {
133 unsigned short val = ucb1400_reg_read(ac97, UCB_TS_CR);
134 return val & (UCB_TS_CR_TSPX_LOW | UCB_TS_CR_TSMX_LOW);
135 }
136
137 static inline void ucb1400_ts_irq_enable(struct snd_ac97 *ac97)
138 {
139 ucb1400_reg_write(ac97, UCB_IE_CLEAR, UCB_IE_TSPX);
140 ucb1400_reg_write(ac97, UCB_IE_CLEAR, 0);
141 ucb1400_reg_write(ac97, UCB_IE_FAL, UCB_IE_TSPX);
142 }
143
144 static inline void ucb1400_ts_irq_disable(struct snd_ac97 *ac97)
145 {
146 ucb1400_reg_write(ac97, UCB_IE_FAL, 0);
147 }
148
149 static void ucb1400_ts_evt_add(struct input_dev *idev, u16 pressure, u16 x, u16 y)
150 {
151 input_report_abs(idev, ABS_X, x);
152 input_report_abs(idev, ABS_Y, y);
153 input_report_abs(idev, ABS_PRESSURE, pressure);
154 input_report_key(idev, BTN_TOUCH, 1);
155 input_sync(idev);
156 }
157
158 static void ucb1400_ts_event_release(struct input_dev *idev)
159 {
160 input_report_abs(idev, ABS_PRESSURE, 0);
161 input_report_key(idev, BTN_TOUCH, 0);
162 input_sync(idev);
163 }
164
165 static void ucb1400_handle_pending_irq(struct ucb1400_ts *ucb)
166 {
167 unsigned int isr;
168
169 isr = ucb1400_reg_read(ucb->ac97, UCB_IE_STATUS);
170 ucb1400_reg_write(ucb->ac97, UCB_IE_CLEAR, isr);
171 ucb1400_reg_write(ucb->ac97, UCB_IE_CLEAR, 0);
172
173 if (isr & UCB_IE_TSPX)
174 ucb1400_ts_irq_disable(ucb->ac97);
175 else
176 dev_dbg(&ucb->ts_idev->dev, "ucb1400: unexpected IE_STATUS = %#x\n", isr);
177 enable_irq(ucb->irq);
178 }
179
180 static int ucb1400_ts_thread(void *_ucb)
181 {
182 struct ucb1400_ts *ucb = _ucb;
183 struct task_struct *tsk = current;
184 int valid = 0;
185 struct sched_param param = { .sched_priority = 1 };
186
187 sched_setscheduler(tsk, SCHED_FIFO, &param);
188
189 set_freezable();
190 while (!kthread_should_stop()) {
191 unsigned int x, y, p;
192 long timeout;
193
194 ucb->ts_restart = 0;
195
196 if (ucb->irq_pending) {
197 ucb->irq_pending = 0;
198 ucb1400_handle_pending_irq(ucb);
199 }
200
201 ucb1400_adc_enable(ucb->ac97);
202 x = ucb1400_ts_read_xpos(ucb);
203 y = ucb1400_ts_read_ypos(ucb);
204 p = ucb1400_ts_read_pressure(ucb);
205 ucb1400_adc_disable(ucb->ac97);
206
207 /* Switch back to interrupt mode. */
208 ucb1400_ts_mode_int(ucb->ac97);
209
210 msleep(10);
211
212 if (ucb1400_ts_pen_down(ucb->ac97)) {
213 ucb1400_ts_irq_enable(ucb->ac97);
214
215 /*
216 * If we spat out a valid sample set last time,
217 * spit out a "pen off" sample here.
218 */
219 if (valid) {
220 ucb1400_ts_event_release(ucb->ts_idev);
221 valid = 0;
222 }
223
224 timeout = MAX_SCHEDULE_TIMEOUT;
225 } else {
226 valid = 1;
227 ucb1400_ts_evt_add(ucb->ts_idev, p, x, y);
228 timeout = msecs_to_jiffies(10);
229 }
230
231 wait_event_freezable_timeout(ucb->ts_wait,
232 ucb->irq_pending || ucb->ts_restart ||
233 kthread_should_stop(), timeout);
234 }
235
236 /* Send the "pen off" if we are stopping with the pen still active */
237 if (valid)
238 ucb1400_ts_event_release(ucb->ts_idev);
239
240 ucb->ts_task = NULL;
241 return 0;
242 }
243
244 /*
245 * A restriction with interrupts exists when using the ucb1400, as
246 * the codec read/write routines may sleep while waiting for codec
247 * access completion and uses semaphores for access control to the
248 * AC97 bus. A complete codec read cycle could take anywhere from
249 * 60 to 100uSec so we *definitely* don't want to spin inside the
250 * interrupt handler waiting for codec access. So, we handle the
251 * interrupt by scheduling a RT kernel thread to run in process
252 * context instead of interrupt context.
253 */
254 static irqreturn_t ucb1400_hard_irq(int irqnr, void *devid)
255 {
256 struct ucb1400_ts *ucb = devid;
257
258 if (irqnr == ucb->irq) {
259 disable_irq_nosync(ucb->irq);
260 ucb->irq_pending = 1;
261 wake_up(&ucb->ts_wait);
262 return IRQ_HANDLED;
263 }
264 return IRQ_NONE;
265 }
266
267 static int ucb1400_ts_open(struct input_dev *idev)
268 {
269 struct ucb1400_ts *ucb = input_get_drvdata(idev);
270 int ret = 0;
271
272 BUG_ON(ucb->ts_task);
273
274 ucb->ts_task = kthread_run(ucb1400_ts_thread, ucb, "UCB1400_ts");
275 if (IS_ERR(ucb->ts_task)) {
276 ret = PTR_ERR(ucb->ts_task);
277 ucb->ts_task = NULL;
278 }
279
280 return ret;
281 }
282
283 static void ucb1400_ts_close(struct input_dev *idev)
284 {
285 struct ucb1400_ts *ucb = input_get_drvdata(idev);
286
287 if (ucb->ts_task)
288 kthread_stop(ucb->ts_task);
289
290 ucb1400_ts_irq_disable(ucb->ac97);
291 ucb1400_reg_write(ucb->ac97, UCB_TS_CR, 0);
292 }
293
294 #ifndef NO_IRQ
295 #define NO_IRQ 0
296 #endif
297
298 /*
299 * Try to probe our interrupt, rather than relying on lots of
300 * hard-coded machine dependencies.
301 */
302 static int ucb1400_ts_detect_irq(struct ucb1400_ts *ucb)
303 {
304 unsigned long mask, timeout;
305
306 mask = probe_irq_on();
307
308 /* Enable the ADC interrupt. */
309 ucb1400_reg_write(ucb->ac97, UCB_IE_RIS, UCB_IE_ADC);
310 ucb1400_reg_write(ucb->ac97, UCB_IE_FAL, UCB_IE_ADC);
311 ucb1400_reg_write(ucb->ac97, UCB_IE_CLEAR, 0xffff);
312 ucb1400_reg_write(ucb->ac97, UCB_IE_CLEAR, 0);
313
314 /* Cause an ADC interrupt. */
315 ucb1400_reg_write(ucb->ac97, UCB_ADC_CR, UCB_ADC_ENA);
316 ucb1400_reg_write(ucb->ac97, UCB_ADC_CR, UCB_ADC_ENA | UCB_ADC_START);
317
318 /* Wait for the conversion to complete. */
319 timeout = jiffies + HZ/2;
320 while (!(ucb1400_reg_read(ucb->ac97, UCB_ADC_DATA) &
321 UCB_ADC_DAT_VALID)) {
322 cpu_relax();
323 if (time_after(jiffies, timeout)) {
324 printk(KERN_ERR "ucb1400: timed out in IRQ probe\n");
325 probe_irq_off(mask);
326 return -ENODEV;
327 }
328 }
329 ucb1400_reg_write(ucb->ac97, UCB_ADC_CR, 0);
330
331 /* Disable and clear interrupt. */
332 ucb1400_reg_write(ucb->ac97, UCB_IE_RIS, 0);
333 ucb1400_reg_write(ucb->ac97, UCB_IE_FAL, 0);
334 ucb1400_reg_write(ucb->ac97, UCB_IE_CLEAR, 0xffff);
335 ucb1400_reg_write(ucb->ac97, UCB_IE_CLEAR, 0);
336
337 /* Read triggered interrupt. */
338 ucb->irq = probe_irq_off(mask);
339 if (ucb->irq < 0 || ucb->irq == NO_IRQ)
340 return -ENODEV;
341
342 return 0;
343 }
344
345 static int ucb1400_ts_probe(struct platform_device *dev)
346 {
347 int error, x_res, y_res;
348 u16 fcsr;
349 struct ucb1400_ts *ucb = dev->dev.platform_data;
350
351 ucb->ts_idev = input_allocate_device();
352 if (!ucb->ts_idev) {
353 error = -ENOMEM;
354 goto err;
355 }
356
357 error = ucb1400_ts_detect_irq(ucb);
358 if (error) {
359 printk(KERN_ERR "UCB1400: IRQ probe failed\n");
360 goto err_free_devs;
361 }
362
363 init_waitqueue_head(&ucb->ts_wait);
364
365 error = request_irq(ucb->irq, ucb1400_hard_irq, IRQF_TRIGGER_RISING,
366 "UCB1400", ucb);
367 if (error) {
368 printk(KERN_ERR "ucb1400: unable to grab irq%d: %d\n",
369 ucb->irq, error);
370 goto err_free_devs;
371 }
372 printk(KERN_DEBUG "UCB1400: found IRQ %d\n", ucb->irq);
373
374 input_set_drvdata(ucb->ts_idev, ucb);
375
376 ucb->ts_idev->dev.parent = &dev->dev;
377 ucb->ts_idev->name = "UCB1400 touchscreen interface";
378 ucb->ts_idev->id.vendor = ucb1400_reg_read(ucb->ac97,
379 AC97_VENDOR_ID1);
380 ucb->ts_idev->id.product = ucb->id;
381 ucb->ts_idev->open = ucb1400_ts_open;
382 ucb->ts_idev->close = ucb1400_ts_close;
383 ucb->ts_idev->evbit[0] = BIT_MASK(EV_ABS) | BIT_MASK(EV_KEY);
384 ucb->ts_idev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
385
386 /*
387 * Enable ADC filter to prevent horrible jitter on Colibri.
388 * This also further reduces jitter on boards where ADCSYNC
389 * pin is connected.
390 */
391 fcsr = ucb1400_reg_read(ucb->ac97, UCB_FCSR);
392 ucb1400_reg_write(ucb->ac97, UCB_FCSR, fcsr | UCB_FCSR_AVE);
393
394 ucb1400_adc_enable(ucb->ac97);
395 x_res = ucb1400_ts_read_xres(ucb);
396 y_res = ucb1400_ts_read_yres(ucb);
397 ucb1400_adc_disable(ucb->ac97);
398 printk(KERN_DEBUG "UCB1400: x/y = %d/%d\n", x_res, y_res);
399
400 input_set_abs_params(ucb->ts_idev, ABS_X, 0, x_res, 0, 0);
401 input_set_abs_params(ucb->ts_idev, ABS_Y, 0, y_res, 0, 0);
402 input_set_abs_params(ucb->ts_idev, ABS_PRESSURE, 0, 0, 0, 0);
403
404 error = input_register_device(ucb->ts_idev);
405 if (error)
406 goto err_free_irq;
407
408 return 0;
409
410 err_free_irq:
411 free_irq(ucb->irq, ucb);
412 err_free_devs:
413 input_free_device(ucb->ts_idev);
414 err:
415 return error;
416
417 }
418
419 static int ucb1400_ts_remove(struct platform_device *dev)
420 {
421 struct ucb1400_ts *ucb = dev->dev.platform_data;
422
423 free_irq(ucb->irq, ucb);
424 input_unregister_device(ucb->ts_idev);
425 return 0;
426 }
427
428 #ifdef CONFIG_PM
429 static int ucb1400_ts_resume(struct platform_device *dev)
430 {
431 struct ucb1400_ts *ucb = dev->dev.platform_data;
432
433 if (ucb->ts_task) {
434 /*
435 * Restart the TS thread to ensure the
436 * TS interrupt mode is set up again
437 * after sleep.
438 */
439 ucb->ts_restart = 1;
440 wake_up(&ucb->ts_wait);
441 }
442 return 0;
443 }
444 #else
445 #define ucb1400_ts_resume NULL
446 #endif
447
448 static struct platform_driver ucb1400_ts_driver = {
449 .probe = ucb1400_ts_probe,
450 .remove = ucb1400_ts_remove,
451 .resume = ucb1400_ts_resume,
452 .driver = {
453 .name = "ucb1400_ts",
454 },
455 };
456
457 static int __init ucb1400_ts_init(void)
458 {
459 return platform_driver_register(&ucb1400_ts_driver);
460 }
461
462 static void __exit ucb1400_ts_exit(void)
463 {
464 platform_driver_unregister(&ucb1400_ts_driver);
465 }
466
467 module_param(adcsync, bool, 0444);
468 MODULE_PARM_DESC(adcsync, "Synchronize touch readings with ADCSYNC pin.");
469
470 module_param(ts_delay, int, 0444);
471 MODULE_PARM_DESC(ts_delay, "Delay between panel setup and"
472 " position read. Default = 55us.");
473
474 module_param(ts_delay_pressure, int, 0444);
475 MODULE_PARM_DESC(ts_delay_pressure,
476 "delay between panel setup and pressure read."
477 " Default = 0us.");
478
479 module_init(ucb1400_ts_init);
480 module_exit(ucb1400_ts_exit);
481
482 MODULE_DESCRIPTION("Philips UCB1400 touchscreen driver");
483 MODULE_LICENSE("GPL");
Linux with added FPC-III support