diff options
author | Russell King <rmk@dyn-67.arm.linux.org.uk> | 2005-09-11 05:26:57 -0400 |
---|---|---|
committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2005-09-11 05:26:57 -0400 |
commit | acb45439a89c6830349c02405f00a7208db0a66b (patch) | |
tree | 4a1a1f2d5012029b70bdfeed46e6cb65c5d82867 /drivers/mfd | |
parent | 05c45ca9aa4ec57e8e22341633c7a98cc879423d (diff) |
[MFD] Add code UCB1200/UCB1300 touchscreen support
Add support for Philips UCB1200 and UCB1300 touchscreen
interfaces found on ARM devices.
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'drivers/mfd')
-rw-r--r-- | drivers/mfd/Kconfig | 4 | ||||
-rw-r--r-- | drivers/mfd/Makefile | 1 | ||||
-rw-r--r-- | drivers/mfd/ucb1x00-ts.c | 430 |
3 files changed, 435 insertions, 0 deletions
diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig index 1f8563bde4a9..550f29744812 100644 --- a/drivers/mfd/Kconfig +++ b/drivers/mfd/Kconfig | |||
@@ -18,4 +18,8 @@ config MCP_UCB1200 | |||
18 | tristate "Support for UCB1200 / UCB1300" | 18 | tristate "Support for UCB1200 / UCB1300" |
19 | depends on MCP | 19 | depends on MCP |
20 | 20 | ||
21 | config MCP_UCB1200_TS | ||
22 | tristate "Touchscreen interface support" | ||
23 | depends on MCP_UCB1200 && INPUT | ||
24 | |||
21 | endmenu | 25 | endmenu |
diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile index 90815b284021..a05cd1599a70 100644 --- a/drivers/mfd/Makefile +++ b/drivers/mfd/Makefile | |||
@@ -5,3 +5,4 @@ | |||
5 | obj-$(CONFIG_MCP) += mcp-core.o | 5 | obj-$(CONFIG_MCP) += mcp-core.o |
6 | obj-$(CONFIG_MCP_SA11X0) += mcp-sa11x0.o | 6 | obj-$(CONFIG_MCP_SA11X0) += mcp-sa11x0.o |
7 | obj-$(CONFIG_MCP_UCB1200) += ucb1x00-core.o | 7 | obj-$(CONFIG_MCP_UCB1200) += ucb1x00-core.o |
8 | obj-$(CONFIG_MCP_UCB1200_TS) += ucb1x00-ts.o | ||
diff --git a/drivers/mfd/ucb1x00-ts.c b/drivers/mfd/ucb1x00-ts.c new file mode 100644 index 000000000000..52e0699eeb8b --- /dev/null +++ b/drivers/mfd/ucb1x00-ts.c | |||
@@ -0,0 +1,430 @@ | |||
1 | /* | ||
2 | * linux/drivers/mfd/ucb1x00-ts.c | ||
3 | * | ||
4 | * Copyright (C) 2001 Russell King, All Rights Reserved. | ||
5 | * | ||
6 | * This program is free software; you can redistribute it and/or modify | ||
7 | * it under the terms of the GNU General Public License version 2 as | ||
8 | * published by the Free Software Foundation. | ||
9 | * | ||
10 | * 21-Jan-2002 <jco@ict.es> : | ||
11 | * | ||
12 | * Added support for synchronous A/D mode. This mode is useful to | ||
13 | * avoid noise induced in the touchpanel by the LCD, provided that | ||
14 | * the UCB1x00 has a valid LCD sync signal routed to its ADCSYNC pin. | ||
15 | * It is important to note that the signal connected to the ADCSYNC | ||
16 | * pin should provide pulses even when the LCD is blanked, otherwise | ||
17 | * a pen touch needed to unblank the LCD will never be read. | ||
18 | */ | ||
19 | #include <linux/config.h> | ||
20 | #include <linux/module.h> | ||
21 | #include <linux/moduleparam.h> | ||
22 | #include <linux/init.h> | ||
23 | #include <linux/smp.h> | ||
24 | #include <linux/smp_lock.h> | ||
25 | #include <linux/sched.h> | ||
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> | ||
31 | #include <linux/suspend.h> | ||
32 | #include <linux/slab.h> | ||
33 | |||
34 | #include <asm/dma.h> | ||
35 | #include <asm/semaphore.h> | ||
36 | |||
37 | #include "ucb1x00.h" | ||
38 | |||
39 | |||
40 | struct ucb1x00_ts { | ||
41 | struct input_dev idev; | ||
42 | struct ucb1x00 *ucb; | ||
43 | |||
44 | wait_queue_head_t irq_wait; | ||
45 | struct semaphore sem; | ||
46 | struct completion init_exit; | ||
47 | struct task_struct *rtask; | ||
48 | int use_count; | ||
49 | u16 x_res; | ||
50 | u16 y_res; | ||
51 | |||
52 | int restart:1; | ||
53 | int adcsync:1; | ||
54 | }; | ||
55 | |||
56 | static int adcsync; | ||
57 | |||
58 | static inline void ucb1x00_ts_evt_add(struct ucb1x00_ts *ts, u16 pressure, u16 x, u16 y) | ||
59 | { | ||
60 | input_report_abs(&ts->idev, ABS_X, x); | ||
61 | input_report_abs(&ts->idev, ABS_Y, y); | ||
62 | input_report_abs(&ts->idev, ABS_PRESSURE, pressure); | ||
63 | input_sync(&ts->idev); | ||
64 | } | ||
65 | |||
66 | static inline void ucb1x00_ts_event_release(struct ucb1x00_ts *ts) | ||
67 | { | ||
68 | input_report_abs(&ts->idev, ABS_PRESSURE, 0); | ||
69 | input_sync(&ts->idev); | ||
70 | } | ||
71 | |||
72 | /* | ||
73 | * Switch to interrupt mode. | ||
74 | */ | ||
75 | static inline void ucb1x00_ts_mode_int(struct ucb1x00_ts *ts) | ||
76 | { | ||
77 | ucb1x00_reg_write(ts->ucb, UCB_TS_CR, | ||
78 | UCB_TS_CR_TSMX_POW | UCB_TS_CR_TSPX_POW | | ||
79 | UCB_TS_CR_TSMY_GND | UCB_TS_CR_TSPY_GND | | ||
80 | UCB_TS_CR_MODE_INT); | ||
81 | } | ||
82 | |||
83 | /* | ||
84 | * Switch to pressure mode, and read pressure. We don't need to wait | ||
85 | * here, since both plates are being driven. | ||
86 | */ | ||
87 | static inline unsigned int ucb1x00_ts_read_pressure(struct ucb1x00_ts *ts) | ||
88 | { | ||
89 | ucb1x00_reg_write(ts->ucb, UCB_TS_CR, | ||
90 | UCB_TS_CR_TSMX_POW | UCB_TS_CR_TSPX_POW | | ||
91 | UCB_TS_CR_TSMY_GND | UCB_TS_CR_TSPY_GND | | ||
92 | UCB_TS_CR_MODE_PRES | UCB_TS_CR_BIAS_ENA); | ||
93 | |||
94 | return ucb1x00_adc_read(ts->ucb, UCB_ADC_INP_TSPY, ts->adcsync); | ||
95 | } | ||
96 | |||
97 | /* | ||
98 | * Switch to X position mode and measure Y plate. We switch the plate | ||
99 | * configuration in pressure mode, then switch to position mode. This | ||
100 | * gives a faster response time. Even so, we need to wait about 55us | ||
101 | * for things to stabilise. | ||
102 | */ | ||
103 | static inline unsigned int ucb1x00_ts_read_xpos(struct ucb1x00_ts *ts) | ||
104 | { | ||
105 | ucb1x00_reg_write(ts->ucb, UCB_TS_CR, | ||
106 | UCB_TS_CR_TSMX_GND | UCB_TS_CR_TSPX_POW | | ||
107 | UCB_TS_CR_MODE_PRES | UCB_TS_CR_BIAS_ENA); | ||
108 | ucb1x00_reg_write(ts->ucb, UCB_TS_CR, | ||
109 | UCB_TS_CR_TSMX_GND | UCB_TS_CR_TSPX_POW | | ||
110 | UCB_TS_CR_MODE_PRES | UCB_TS_CR_BIAS_ENA); | ||
111 | ucb1x00_reg_write(ts->ucb, UCB_TS_CR, | ||
112 | UCB_TS_CR_TSMX_GND | UCB_TS_CR_TSPX_POW | | ||
113 | UCB_TS_CR_MODE_POS | UCB_TS_CR_BIAS_ENA); | ||
114 | |||
115 | udelay(55); | ||
116 | |||
117 | return ucb1x00_adc_read(ts->ucb, UCB_ADC_INP_TSPY, ts->adcsync); | ||
118 | } | ||
119 | |||
120 | /* | ||
121 | * Switch to Y position mode and measure X plate. We switch the plate | ||
122 | * configuration in pressure mode, then switch to position mode. This | ||
123 | * gives a faster response time. Even so, we need to wait about 55us | ||
124 | * for things to stabilise. | ||
125 | */ | ||
126 | static inline unsigned int ucb1x00_ts_read_ypos(struct ucb1x00_ts *ts) | ||
127 | { | ||
128 | ucb1x00_reg_write(ts->ucb, UCB_TS_CR, | ||
129 | UCB_TS_CR_TSMY_GND | UCB_TS_CR_TSPY_POW | | ||
130 | UCB_TS_CR_MODE_PRES | UCB_TS_CR_BIAS_ENA); | ||
131 | ucb1x00_reg_write(ts->ucb, UCB_TS_CR, | ||
132 | UCB_TS_CR_TSMY_GND | UCB_TS_CR_TSPY_POW | | ||
133 | UCB_TS_CR_MODE_PRES | UCB_TS_CR_BIAS_ENA); | ||
134 | ucb1x00_reg_write(ts->ucb, UCB_TS_CR, | ||
135 | UCB_TS_CR_TSMY_GND | UCB_TS_CR_TSPY_POW | | ||
136 | UCB_TS_CR_MODE_POS | UCB_TS_CR_BIAS_ENA); | ||
137 | |||
138 | udelay(55); | ||
139 | |||
140 | return ucb1x00_adc_read(ts->ucb, UCB_ADC_INP_TSPX, ts->adcsync); | ||
141 | } | ||
142 | |||
143 | /* | ||
144 | * Switch to X plate resistance mode. Set MX to ground, PX to | ||
145 | * supply. Measure current. | ||
146 | */ | ||
147 | static inline unsigned int ucb1x00_ts_read_xres(struct ucb1x00_ts *ts) | ||
148 | { | ||
149 | ucb1x00_reg_write(ts->ucb, UCB_TS_CR, | ||
150 | UCB_TS_CR_TSMX_GND | UCB_TS_CR_TSPX_POW | | ||
151 | UCB_TS_CR_MODE_PRES | UCB_TS_CR_BIAS_ENA); | ||
152 | return ucb1x00_adc_read(ts->ucb, 0, ts->adcsync); | ||
153 | } | ||
154 | |||
155 | /* | ||
156 | * Switch to Y plate resistance mode. Set MY to ground, PY to | ||
157 | * supply. Measure current. | ||
158 | */ | ||
159 | static inline unsigned int ucb1x00_ts_read_yres(struct ucb1x00_ts *ts) | ||
160 | { | ||
161 | ucb1x00_reg_write(ts->ucb, UCB_TS_CR, | ||
162 | UCB_TS_CR_TSMY_GND | UCB_TS_CR_TSPY_POW | | ||
163 | UCB_TS_CR_MODE_PRES | UCB_TS_CR_BIAS_ENA); | ||
164 | return ucb1x00_adc_read(ts->ucb, 0, ts->adcsync); | ||
165 | } | ||
166 | |||
167 | /* | ||
168 | * This is a RT kernel thread that handles the ADC accesses | ||
169 | * (mainly so we can use semaphores in the UCB1200 core code | ||
170 | * to serialise accesses to the ADC). | ||
171 | */ | ||
172 | static int ucb1x00_thread(void *_ts) | ||
173 | { | ||
174 | struct ucb1x00_ts *ts = _ts; | ||
175 | struct task_struct *tsk = current; | ||
176 | DECLARE_WAITQUEUE(wait, tsk); | ||
177 | int valid; | ||
178 | |||
179 | ts->rtask = tsk; | ||
180 | |||
181 | daemonize("ktsd"); | ||
182 | /* only want to receive SIGKILL */ | ||
183 | allow_signal(SIGKILL); | ||
184 | |||
185 | /* | ||
186 | * We could run as a real-time thread. However, thus far | ||
187 | * this doesn't seem to be necessary. | ||
188 | */ | ||
189 | // tsk->policy = SCHED_FIFO; | ||
190 | // tsk->rt_priority = 1; | ||
191 | |||
192 | complete(&ts->init_exit); | ||
193 | |||
194 | valid = 0; | ||
195 | |||
196 | add_wait_queue(&ts->irq_wait, &wait); | ||
197 | for (;;) { | ||
198 | unsigned int x, y, p, val; | ||
199 | signed long timeout; | ||
200 | |||
201 | ts->restart = 0; | ||
202 | |||
203 | ucb1x00_adc_enable(ts->ucb); | ||
204 | |||
205 | x = ucb1x00_ts_read_xpos(ts); | ||
206 | y = ucb1x00_ts_read_ypos(ts); | ||
207 | p = ucb1x00_ts_read_pressure(ts); | ||
208 | |||
209 | /* | ||
210 | * Switch back to interrupt mode. | ||
211 | */ | ||
212 | ucb1x00_ts_mode_int(ts); | ||
213 | ucb1x00_adc_disable(ts->ucb); | ||
214 | |||
215 | set_task_state(tsk, TASK_UNINTERRUPTIBLE); | ||
216 | schedule_timeout(HZ / 100); | ||
217 | if (signal_pending(tsk)) | ||
218 | break; | ||
219 | |||
220 | ucb1x00_enable(ts->ucb); | ||
221 | val = ucb1x00_reg_read(ts->ucb, UCB_TS_CR); | ||
222 | |||
223 | if (val & (UCB_TS_CR_TSPX_LOW | UCB_TS_CR_TSMX_LOW)) { | ||
224 | set_task_state(tsk, TASK_INTERRUPTIBLE); | ||
225 | |||
226 | ucb1x00_enable_irq(ts->ucb, UCB_IRQ_TSPX, UCB_FALLING); | ||
227 | ucb1x00_disable(ts->ucb); | ||
228 | |||
229 | /* | ||
230 | * If we spat out a valid sample set last time, | ||
231 | * spit out a "pen off" sample here. | ||
232 | */ | ||
233 | if (valid) { | ||
234 | ucb1x00_ts_event_release(ts); | ||
235 | valid = 0; | ||
236 | } | ||
237 | |||
238 | timeout = MAX_SCHEDULE_TIMEOUT; | ||
239 | } else { | ||
240 | ucb1x00_disable(ts->ucb); | ||
241 | |||
242 | /* | ||
243 | * Filtering is policy. Policy belongs in user | ||
244 | * space. We therefore leave it to user space | ||
245 | * to do any filtering they please. | ||
246 | */ | ||
247 | if (!ts->restart) { | ||
248 | ucb1x00_ts_evt_add(ts, p, x, y); | ||
249 | valid = 1; | ||
250 | } | ||
251 | |||
252 | set_task_state(tsk, TASK_INTERRUPTIBLE); | ||
253 | timeout = HZ / 100; | ||
254 | } | ||
255 | |||
256 | try_to_freeze(); | ||
257 | |||
258 | schedule_timeout(timeout); | ||
259 | if (signal_pending(tsk)) | ||
260 | break; | ||
261 | } | ||
262 | |||
263 | remove_wait_queue(&ts->irq_wait, &wait); | ||
264 | |||
265 | ts->rtask = NULL; | ||
266 | complete_and_exit(&ts->init_exit, 0); | ||
267 | } | ||
268 | |||
269 | /* | ||
270 | * We only detect touch screen _touches_ with this interrupt | ||
271 | * handler, and even then we just schedule our task. | ||
272 | */ | ||
273 | static void ucb1x00_ts_irq(int idx, void *id) | ||
274 | { | ||
275 | struct ucb1x00_ts *ts = id; | ||
276 | ucb1x00_disable_irq(ts->ucb, UCB_IRQ_TSPX, UCB_FALLING); | ||
277 | wake_up(&ts->irq_wait); | ||
278 | } | ||
279 | |||
280 | static int ucb1x00_ts_open(struct input_dev *idev) | ||
281 | { | ||
282 | struct ucb1x00_ts *ts = (struct ucb1x00_ts *)idev; | ||
283 | int ret = 0; | ||
284 | |||
285 | if (down_interruptible(&ts->sem)) | ||
286 | return -EINTR; | ||
287 | |||
288 | if (ts->use_count++ != 0) | ||
289 | goto out; | ||
290 | |||
291 | if (ts->rtask) | ||
292 | panic("ucb1x00: rtask running?"); | ||
293 | |||
294 | init_waitqueue_head(&ts->irq_wait); | ||
295 | ret = ucb1x00_hook_irq(ts->ucb, UCB_IRQ_TSPX, ucb1x00_ts_irq, ts); | ||
296 | if (ret < 0) | ||
297 | goto out; | ||
298 | |||
299 | /* | ||
300 | * If we do this at all, we should allow the user to | ||
301 | * measure and read the X and Y resistance at any time. | ||
302 | */ | ||
303 | ucb1x00_adc_enable(ts->ucb); | ||
304 | ts->x_res = ucb1x00_ts_read_xres(ts); | ||
305 | ts->y_res = ucb1x00_ts_read_yres(ts); | ||
306 | ucb1x00_adc_disable(ts->ucb); | ||
307 | |||
308 | init_completion(&ts->init_exit); | ||
309 | ret = kernel_thread(ucb1x00_thread, ts, CLONE_KERNEL); | ||
310 | if (ret >= 0) { | ||
311 | wait_for_completion(&ts->init_exit); | ||
312 | ret = 0; | ||
313 | } else { | ||
314 | ucb1x00_free_irq(ts->ucb, UCB_IRQ_TSPX, ts); | ||
315 | } | ||
316 | |||
317 | out: | ||
318 | if (ret) | ||
319 | ts->use_count--; | ||
320 | up(&ts->sem); | ||
321 | return ret; | ||
322 | } | ||
323 | |||
324 | /* | ||
325 | * Release touchscreen resources. Disable IRQs. | ||
326 | */ | ||
327 | static void ucb1x00_ts_close(struct input_dev *idev) | ||
328 | { | ||
329 | struct ucb1x00_ts *ts = (struct ucb1x00_ts *)idev; | ||
330 | |||
331 | down(&ts->sem); | ||
332 | if (--ts->use_count == 0) { | ||
333 | if (ts->rtask) { | ||
334 | send_sig(SIGKILL, ts->rtask, 1); | ||
335 | wait_for_completion(&ts->init_exit); | ||
336 | } | ||
337 | |||
338 | ucb1x00_enable(ts->ucb); | ||
339 | ucb1x00_free_irq(ts->ucb, UCB_IRQ_TSPX, ts); | ||
340 | ucb1x00_reg_write(ts->ucb, UCB_TS_CR, 0); | ||
341 | ucb1x00_disable(ts->ucb); | ||
342 | } | ||
343 | up(&ts->sem); | ||
344 | } | ||
345 | |||
346 | #ifdef CONFIG_PM | ||
347 | static int ucb1x00_ts_resume(struct ucb1x00_dev *dev) | ||
348 | { | ||
349 | struct ucb1x00_ts *ts = dev->priv; | ||
350 | |||
351 | if (ts->rtask != NULL) { | ||
352 | /* | ||
353 | * Restart the TS thread to ensure the | ||
354 | * TS interrupt mode is set up again | ||
355 | * after sleep. | ||
356 | */ | ||
357 | ts->restart = 1; | ||
358 | wake_up(&ts->irq_wait); | ||
359 | } | ||
360 | return 0; | ||
361 | } | ||
362 | #else | ||
363 | #define ucb1x00_ts_resume NULL | ||
364 | #endif | ||
365 | |||
366 | |||
367 | /* | ||
368 | * Initialisation. | ||
369 | */ | ||
370 | static int ucb1x00_ts_add(struct ucb1x00_dev *dev) | ||
371 | { | ||
372 | struct ucb1x00_ts *ts; | ||
373 | |||
374 | ts = kmalloc(sizeof(struct ucb1x00_ts), GFP_KERNEL); | ||
375 | if (!ts) | ||
376 | return -ENOMEM; | ||
377 | |||
378 | memset(ts, 0, sizeof(struct ucb1x00_ts)); | ||
379 | |||
380 | ts->ucb = dev->ucb; | ||
381 | ts->adcsync = adcsync ? UCB_SYNC : UCB_NOSYNC; | ||
382 | init_MUTEX(&ts->sem); | ||
383 | |||
384 | ts->idev.name = "Touchscreen panel"; | ||
385 | ts->idev.id.product = ts->ucb->id; | ||
386 | ts->idev.open = ucb1x00_ts_open; | ||
387 | ts->idev.close = ucb1x00_ts_close; | ||
388 | |||
389 | __set_bit(EV_ABS, ts->idev.evbit); | ||
390 | __set_bit(ABS_X, ts->idev.absbit); | ||
391 | __set_bit(ABS_Y, ts->idev.absbit); | ||
392 | __set_bit(ABS_PRESSURE, ts->idev.absbit); | ||
393 | |||
394 | input_register_device(&ts->idev); | ||
395 | |||
396 | dev->priv = ts; | ||
397 | |||
398 | return 0; | ||
399 | } | ||
400 | |||
401 | static void ucb1x00_ts_remove(struct ucb1x00_dev *dev) | ||
402 | { | ||
403 | struct ucb1x00_ts *ts = dev->priv; | ||
404 | input_unregister_device(&ts->idev); | ||
405 | kfree(ts); | ||
406 | } | ||
407 | |||
408 | static struct ucb1x00_driver ucb1x00_ts_driver = { | ||
409 | .add = ucb1x00_ts_add, | ||
410 | .remove = ucb1x00_ts_remove, | ||
411 | .resume = ucb1x00_ts_resume, | ||
412 | }; | ||
413 | |||
414 | static int __init ucb1x00_ts_init(void) | ||
415 | { | ||
416 | return ucb1x00_register_driver(&ucb1x00_ts_driver); | ||
417 | } | ||
418 | |||
419 | static void __exit ucb1x00_ts_exit(void) | ||
420 | { | ||
421 | ucb1x00_unregister_driver(&ucb1x00_ts_driver); | ||
422 | } | ||
423 | |||
424 | module_param(adcsync, int, 0444); | ||
425 | module_init(ucb1x00_ts_init); | ||
426 | module_exit(ucb1x00_ts_exit); | ||
427 | |||
428 | MODULE_AUTHOR("Russell King <rmk@arm.linux.org.uk>"); | ||
429 | MODULE_DESCRIPTION("UCB1x00 touchscreen driver"); | ||
430 | MODULE_LICENSE("GPL"); | ||