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9bcc00b9 EM |
1 | /* |
2 | * Touchscreen driver for Dialog Semiconductor DA9034 | |
3 | * | |
4 | * Copyright (C) 2006-2008 Marvell International Ltd. | |
5 | * Fengwei Yin <fengwei.yin@marvell.com> | |
93ff27c6 | 6 | * Bin Yang <bin.yang@marvell.com> |
9bcc00b9 EM |
7 | * Eric Miao <eric.miao@marvell.com> |
8 | * | |
9 | * This program is free software; you can redistribute it and/or modify | |
10 | * it under the terms of the GNU General Public License version 2 as | |
11 | * published by the Free Software Foundation. | |
12 | */ | |
13 | ||
14 | #include <linux/module.h> | |
15 | #include <linux/kernel.h> | |
16 | #include <linux/init.h> | |
17 | #include <linux/delay.h> | |
18 | #include <linux/platform_device.h> | |
19 | #include <linux/input.h> | |
30aafdba | 20 | #include <linux/workqueue.h> |
9bcc00b9 | 21 | #include <linux/mfd/da903x.h> |
5a0e3ad6 | 22 | #include <linux/slab.h> |
9bcc00b9 EM |
23 | |
24 | #define DA9034_MANUAL_CTRL 0x50 | |
25 | #define DA9034_LDO_ADC_EN (1 << 4) | |
26 | ||
27 | #define DA9034_AUTO_CTRL1 0x51 | |
28 | ||
29 | #define DA9034_AUTO_CTRL2 0x52 | |
30 | #define DA9034_AUTO_TSI_EN (1 << 3) | |
31 | #define DA9034_PEN_DETECT (1 << 4) | |
32 | ||
33 | #define DA9034_TSI_CTRL1 0x53 | |
34 | #define DA9034_TSI_CTRL2 0x54 | |
35 | #define DA9034_TSI_X_MSB 0x6c | |
36 | #define DA9034_TSI_Y_MSB 0x6d | |
37 | #define DA9034_TSI_XY_LSB 0x6e | |
38 | ||
39 | enum { | |
40 | STATE_IDLE, /* wait for pendown */ | |
41 | STATE_BUSY, /* TSI busy sampling */ | |
42 | STATE_STOP, /* sample available */ | |
43 | STATE_WAIT, /* Wait to start next sample */ | |
44 | }; | |
45 | ||
46 | enum { | |
47 | EVENT_PEN_DOWN, | |
48 | EVENT_PEN_UP, | |
49 | EVENT_TSI_READY, | |
50 | EVENT_TIMEDOUT, | |
51 | }; | |
52 | ||
53 | struct da9034_touch { | |
54 | struct device *da9034_dev; | |
55 | struct input_dev *input_dev; | |
56 | ||
57 | struct delayed_work tsi_work; | |
58 | struct notifier_block notifier; | |
59 | ||
60 | int state; | |
61 | ||
62 | int interval_ms; | |
63 | int x_inverted; | |
64 | int y_inverted; | |
65 | ||
66 | int last_x; | |
67 | int last_y; | |
68 | }; | |
69 | ||
70 | static inline int is_pen_down(struct da9034_touch *touch) | |
71 | { | |
72 | return da903x_query_status(touch->da9034_dev, DA9034_STATUS_PEN_DOWN); | |
73 | } | |
74 | ||
75 | static inline int detect_pen_down(struct da9034_touch *touch, int on) | |
76 | { | |
77 | if (on) | |
78 | return da903x_set_bits(touch->da9034_dev, | |
79 | DA9034_AUTO_CTRL2, DA9034_PEN_DETECT); | |
80 | else | |
81 | return da903x_clr_bits(touch->da9034_dev, | |
82 | DA9034_AUTO_CTRL2, DA9034_PEN_DETECT); | |
83 | } | |
84 | ||
85 | static int read_tsi(struct da9034_touch *touch) | |
86 | { | |
87 | uint8_t _x, _y, _v; | |
88 | int ret; | |
89 | ||
90 | ret = da903x_read(touch->da9034_dev, DA9034_TSI_X_MSB, &_x); | |
91 | if (ret) | |
92 | return ret; | |
93 | ||
94 | ret = da903x_read(touch->da9034_dev, DA9034_TSI_Y_MSB, &_y); | |
95 | if (ret) | |
96 | return ret; | |
97 | ||
98 | ret = da903x_read(touch->da9034_dev, DA9034_TSI_XY_LSB, &_v); | |
99 | if (ret) | |
100 | return ret; | |
101 | ||
102 | touch->last_x = ((_x << 2) & 0x3fc) | (_v & 0x3); | |
103 | touch->last_y = ((_y << 2) & 0x3fc) | ((_v & 0xc) >> 2); | |
104 | ||
105 | return 0; | |
106 | } | |
107 | ||
108 | static inline int start_tsi(struct da9034_touch *touch) | |
109 | { | |
110 | return da903x_set_bits(touch->da9034_dev, | |
111 | DA9034_AUTO_CTRL2, DA9034_AUTO_TSI_EN); | |
112 | } | |
113 | ||
114 | static inline int stop_tsi(struct da9034_touch *touch) | |
115 | { | |
116 | return da903x_clr_bits(touch->da9034_dev, | |
117 | DA9034_AUTO_CTRL2, DA9034_AUTO_TSI_EN); | |
118 | } | |
119 | ||
120 | static inline void report_pen_down(struct da9034_touch *touch) | |
121 | { | |
122 | int x = touch->last_x; | |
123 | int y = touch->last_y; | |
124 | ||
125 | x &= 0xfff; | |
126 | if (touch->x_inverted) | |
127 | x = 1024 - x; | |
128 | y &= 0xfff; | |
129 | if (touch->y_inverted) | |
130 | y = 1024 - y; | |
131 | ||
132 | input_report_abs(touch->input_dev, ABS_X, x); | |
133 | input_report_abs(touch->input_dev, ABS_Y, y); | |
134 | input_report_key(touch->input_dev, BTN_TOUCH, 1); | |
135 | ||
136 | input_sync(touch->input_dev); | |
137 | } | |
138 | ||
139 | static inline void report_pen_up(struct da9034_touch *touch) | |
140 | { | |
141 | input_report_key(touch->input_dev, BTN_TOUCH, 0); | |
142 | input_sync(touch->input_dev); | |
143 | } | |
144 | ||
145 | static void da9034_event_handler(struct da9034_touch *touch, int event) | |
146 | { | |
147 | int err; | |
148 | ||
149 | switch (touch->state) { | |
150 | case STATE_IDLE: | |
151 | if (event != EVENT_PEN_DOWN) | |
152 | break; | |
153 | ||
154 | /* Enable auto measurement of the TSI, this will | |
155 | * automatically disable pen down detection | |
156 | */ | |
157 | err = start_tsi(touch); | |
158 | if (err) | |
159 | goto err_reset; | |
160 | ||
161 | touch->state = STATE_BUSY; | |
162 | break; | |
163 | ||
164 | case STATE_BUSY: | |
165 | if (event != EVENT_TSI_READY) | |
166 | break; | |
167 | ||
168 | err = read_tsi(touch); | |
169 | if (err) | |
170 | goto err_reset; | |
171 | ||
172 | /* Disable auto measurement of the TSI, so that | |
173 | * pen down status will be available | |
174 | */ | |
175 | err = stop_tsi(touch); | |
176 | if (err) | |
177 | goto err_reset; | |
178 | ||
179 | touch->state = STATE_STOP; | |
7f6d5ff2 EM |
180 | |
181 | /* FIXME: PEN_{UP/DOWN} events are expected to be | |
182 | * available by stopping TSI, but this is found not | |
183 | * always true, delay and simulate such an event | |
184 | * here is more reliable | |
185 | */ | |
186 | mdelay(1); | |
187 | da9034_event_handler(touch, | |
188 | is_pen_down(touch) ? EVENT_PEN_DOWN : | |
189 | EVENT_PEN_UP); | |
9bcc00b9 EM |
190 | break; |
191 | ||
192 | case STATE_STOP: | |
193 | if (event == EVENT_PEN_DOWN) { | |
194 | report_pen_down(touch); | |
195 | schedule_delayed_work(&touch->tsi_work, | |
196 | msecs_to_jiffies(touch->interval_ms)); | |
197 | touch->state = STATE_WAIT; | |
198 | } | |
199 | ||
200 | if (event == EVENT_PEN_UP) { | |
201 | report_pen_up(touch); | |
202 | touch->state = STATE_IDLE; | |
203 | } | |
9bcc00b9 EM |
204 | break; |
205 | ||
206 | case STATE_WAIT: | |
207 | if (event != EVENT_TIMEDOUT) | |
208 | break; | |
209 | ||
210 | if (is_pen_down(touch)) { | |
211 | start_tsi(touch); | |
212 | touch->state = STATE_BUSY; | |
7f6d5ff2 EM |
213 | } else { |
214 | report_pen_up(touch); | |
9bcc00b9 | 215 | touch->state = STATE_IDLE; |
7f6d5ff2 | 216 | } |
9bcc00b9 EM |
217 | break; |
218 | } | |
219 | return; | |
220 | ||
221 | err_reset: | |
222 | touch->state = STATE_IDLE; | |
223 | stop_tsi(touch); | |
224 | detect_pen_down(touch, 1); | |
225 | } | |
226 | ||
227 | static void da9034_tsi_work(struct work_struct *work) | |
228 | { | |
229 | struct da9034_touch *touch = | |
230 | container_of(work, struct da9034_touch, tsi_work.work); | |
231 | ||
232 | da9034_event_handler(touch, EVENT_TIMEDOUT); | |
233 | } | |
234 | ||
235 | static int da9034_touch_notifier(struct notifier_block *nb, | |
236 | unsigned long event, void *data) | |
237 | { | |
238 | struct da9034_touch *touch = | |
239 | container_of(nb, struct da9034_touch, notifier); | |
240 | ||
9bcc00b9 EM |
241 | if (event & DA9034_EVENT_TSI_READY) |
242 | da9034_event_handler(touch, EVENT_TSI_READY); | |
243 | ||
7f6d5ff2 EM |
244 | if ((event & DA9034_EVENT_PEN_DOWN) && touch->state == STATE_IDLE) |
245 | da9034_event_handler(touch, EVENT_PEN_DOWN); | |
246 | ||
9bcc00b9 EM |
247 | return 0; |
248 | } | |
249 | ||
250 | static int da9034_touch_open(struct input_dev *dev) | |
251 | { | |
252 | struct da9034_touch *touch = input_get_drvdata(dev); | |
253 | int ret; | |
254 | ||
255 | ret = da903x_register_notifier(touch->da9034_dev, &touch->notifier, | |
256 | DA9034_EVENT_PEN_DOWN | DA9034_EVENT_TSI_READY); | |
257 | if (ret) | |
258 | return -EBUSY; | |
259 | ||
260 | /* Enable ADC LDO */ | |
261 | ret = da903x_set_bits(touch->da9034_dev, | |
262 | DA9034_MANUAL_CTRL, DA9034_LDO_ADC_EN); | |
263 | if (ret) | |
264 | return ret; | |
265 | ||
266 | /* TSI_DELAY: 3 slots, TSI_SKIP: 3 slots */ | |
267 | ret = da903x_write(touch->da9034_dev, DA9034_TSI_CTRL1, 0x1b); | |
268 | if (ret) | |
269 | return ret; | |
270 | ||
271 | ret = da903x_write(touch->da9034_dev, DA9034_TSI_CTRL2, 0x00); | |
272 | if (ret) | |
273 | return ret; | |
274 | ||
275 | touch->state = STATE_IDLE; | |
276 | detect_pen_down(touch, 1); | |
277 | ||
278 | return 0; | |
279 | } | |
280 | ||
281 | static void da9034_touch_close(struct input_dev *dev) | |
282 | { | |
283 | struct da9034_touch *touch = input_get_drvdata(dev); | |
284 | ||
285 | da903x_unregister_notifier(touch->da9034_dev, &touch->notifier, | |
286 | DA9034_EVENT_PEN_DOWN | DA9034_EVENT_TSI_READY); | |
287 | ||
288 | cancel_delayed_work_sync(&touch->tsi_work); | |
289 | ||
290 | touch->state = STATE_IDLE; | |
291 | stop_tsi(touch); | |
292 | detect_pen_down(touch, 0); | |
293 | ||
294 | /* Disable ADC LDO */ | |
295 | da903x_clr_bits(touch->da9034_dev, | |
296 | DA9034_MANUAL_CTRL, DA9034_LDO_ADC_EN); | |
297 | } | |
298 | ||
299 | ||
300 | static int __devinit da9034_touch_probe(struct platform_device *pdev) | |
301 | { | |
302 | struct da9034_touch_pdata *pdata = pdev->dev.platform_data; | |
303 | struct da9034_touch *touch; | |
304 | struct input_dev *input_dev; | |
305 | int ret; | |
306 | ||
307 | touch = kzalloc(sizeof(struct da9034_touch), GFP_KERNEL); | |
308 | if (touch == NULL) { | |
309 | dev_err(&pdev->dev, "failed to allocate driver data\n"); | |
310 | return -ENOMEM; | |
311 | } | |
312 | ||
313 | touch->da9034_dev = pdev->dev.parent; | |
314 | ||
315 | if (pdata) { | |
316 | touch->interval_ms = pdata->interval_ms; | |
317 | touch->x_inverted = pdata->x_inverted; | |
318 | touch->y_inverted = pdata->y_inverted; | |
319 | } else | |
320 | /* fallback into default */ | |
321 | touch->interval_ms = 10; | |
322 | ||
323 | INIT_DELAYED_WORK(&touch->tsi_work, da9034_tsi_work); | |
324 | touch->notifier.notifier_call = da9034_touch_notifier; | |
325 | ||
326 | input_dev = input_allocate_device(); | |
327 | if (!input_dev) { | |
328 | dev_err(&pdev->dev, "failed to allocate input device\n"); | |
329 | ret = -ENOMEM; | |
330 | goto err_free_touch; | |
331 | } | |
332 | ||
333 | input_dev->name = pdev->name; | |
334 | input_dev->open = da9034_touch_open; | |
335 | input_dev->close = da9034_touch_close; | |
336 | input_dev->dev.parent = &pdev->dev; | |
337 | ||
338 | __set_bit(EV_ABS, input_dev->evbit); | |
339 | __set_bit(ABS_X, input_dev->absbit); | |
340 | __set_bit(ABS_Y, input_dev->absbit); | |
341 | input_set_abs_params(input_dev, ABS_X, 0, 1023, 0, 0); | |
342 | input_set_abs_params(input_dev, ABS_Y, 0, 1023, 0, 0); | |
343 | ||
344 | __set_bit(EV_KEY, input_dev->evbit); | |
345 | __set_bit(BTN_TOUCH, input_dev->keybit); | |
346 | ||
347 | touch->input_dev = input_dev; | |
348 | input_set_drvdata(input_dev, touch); | |
349 | ||
350 | ret = input_register_device(input_dev); | |
351 | if (ret) | |
352 | goto err_free_input; | |
353 | ||
354 | platform_set_drvdata(pdev, touch); | |
355 | return 0; | |
356 | ||
357 | err_free_input: | |
358 | input_free_device(input_dev); | |
359 | err_free_touch: | |
360 | kfree(touch); | |
361 | return ret; | |
362 | } | |
363 | ||
364 | static int __devexit da9034_touch_remove(struct platform_device *pdev) | |
365 | { | |
366 | struct da9034_touch *touch = platform_get_drvdata(pdev); | |
367 | ||
368 | input_unregister_device(touch->input_dev); | |
369 | kfree(touch); | |
370 | ||
371 | return 0; | |
372 | } | |
373 | ||
374 | static struct platform_driver da9034_touch_driver = { | |
375 | .driver = { | |
376 | .name = "da9034-touch", | |
377 | .owner = THIS_MODULE, | |
378 | }, | |
379 | .probe = da9034_touch_probe, | |
380 | .remove = __devexit_p(da9034_touch_remove), | |
381 | }; | |
382 | ||
383 | static int __init da9034_touch_init(void) | |
384 | { | |
385 | return platform_driver_register(&da9034_touch_driver); | |
386 | } | |
387 | module_init(da9034_touch_init); | |
388 | ||
389 | static void __exit da9034_touch_exit(void) | |
390 | { | |
391 | platform_driver_unregister(&da9034_touch_driver); | |
392 | } | |
393 | module_exit(da9034_touch_exit); | |
394 | ||
395 | MODULE_DESCRIPTION("Touchscreen driver for Dialog Semiconductor DA9034"); | |
93ff27c6 | 396 | MODULE_AUTHOR("Eric Miao <eric.miao@marvell.com>, Bin Yang <bin.yang@marvell.com>"); |
9bcc00b9 EM |
397 | MODULE_LICENSE("GPL"); |
398 | MODULE_ALIAS("platform:da9034-touch"); |