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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> | |
9bcc00b9 EM |
16 | #include <linux/delay.h> |
17 | #include <linux/platform_device.h> | |
18 | #include <linux/input.h> | |
30aafdba | 19 | #include <linux/workqueue.h> |
9bcc00b9 | 20 | #include <linux/mfd/da903x.h> |
5a0e3ad6 | 21 | #include <linux/slab.h> |
9bcc00b9 EM |
22 | |
23 | #define DA9034_MANUAL_CTRL 0x50 | |
24 | #define DA9034_LDO_ADC_EN (1 << 4) | |
25 | ||
26 | #define DA9034_AUTO_CTRL1 0x51 | |
27 | ||
28 | #define DA9034_AUTO_CTRL2 0x52 | |
29 | #define DA9034_AUTO_TSI_EN (1 << 3) | |
30 | #define DA9034_PEN_DETECT (1 << 4) | |
31 | ||
32 | #define DA9034_TSI_CTRL1 0x53 | |
33 | #define DA9034_TSI_CTRL2 0x54 | |
34 | #define DA9034_TSI_X_MSB 0x6c | |
35 | #define DA9034_TSI_Y_MSB 0x6d | |
36 | #define DA9034_TSI_XY_LSB 0x6e | |
37 | ||
38 | enum { | |
39 | STATE_IDLE, /* wait for pendown */ | |
40 | STATE_BUSY, /* TSI busy sampling */ | |
41 | STATE_STOP, /* sample available */ | |
42 | STATE_WAIT, /* Wait to start next sample */ | |
43 | }; | |
44 | ||
45 | enum { | |
46 | EVENT_PEN_DOWN, | |
47 | EVENT_PEN_UP, | |
48 | EVENT_TSI_READY, | |
49 | EVENT_TIMEDOUT, | |
50 | }; | |
51 | ||
52 | struct da9034_touch { | |
53 | struct device *da9034_dev; | |
54 | struct input_dev *input_dev; | |
55 | ||
56 | struct delayed_work tsi_work; | |
57 | struct notifier_block notifier; | |
58 | ||
59 | int state; | |
60 | ||
61 | int interval_ms; | |
62 | int x_inverted; | |
63 | int y_inverted; | |
64 | ||
65 | int last_x; | |
66 | int last_y; | |
67 | }; | |
68 | ||
69 | static inline int is_pen_down(struct da9034_touch *touch) | |
70 | { | |
71 | return da903x_query_status(touch->da9034_dev, DA9034_STATUS_PEN_DOWN); | |
72 | } | |
73 | ||
74 | static inline int detect_pen_down(struct da9034_touch *touch, int on) | |
75 | { | |
76 | if (on) | |
77 | return da903x_set_bits(touch->da9034_dev, | |
78 | DA9034_AUTO_CTRL2, DA9034_PEN_DETECT); | |
79 | else | |
80 | return da903x_clr_bits(touch->da9034_dev, | |
81 | DA9034_AUTO_CTRL2, DA9034_PEN_DETECT); | |
82 | } | |
83 | ||
84 | static int read_tsi(struct da9034_touch *touch) | |
85 | { | |
86 | uint8_t _x, _y, _v; | |
87 | int ret; | |
88 | ||
89 | ret = da903x_read(touch->da9034_dev, DA9034_TSI_X_MSB, &_x); | |
90 | if (ret) | |
91 | return ret; | |
92 | ||
93 | ret = da903x_read(touch->da9034_dev, DA9034_TSI_Y_MSB, &_y); | |
94 | if (ret) | |
95 | return ret; | |
96 | ||
97 | ret = da903x_read(touch->da9034_dev, DA9034_TSI_XY_LSB, &_v); | |
98 | if (ret) | |
99 | return ret; | |
100 | ||
101 | touch->last_x = ((_x << 2) & 0x3fc) | (_v & 0x3); | |
102 | touch->last_y = ((_y << 2) & 0x3fc) | ((_v & 0xc) >> 2); | |
103 | ||
104 | return 0; | |
105 | } | |
106 | ||
107 | static inline int start_tsi(struct da9034_touch *touch) | |
108 | { | |
109 | return da903x_set_bits(touch->da9034_dev, | |
110 | DA9034_AUTO_CTRL2, DA9034_AUTO_TSI_EN); | |
111 | } | |
112 | ||
113 | static inline int stop_tsi(struct da9034_touch *touch) | |
114 | { | |
115 | return da903x_clr_bits(touch->da9034_dev, | |
116 | DA9034_AUTO_CTRL2, DA9034_AUTO_TSI_EN); | |
117 | } | |
118 | ||
119 | static inline void report_pen_down(struct da9034_touch *touch) | |
120 | { | |
121 | int x = touch->last_x; | |
122 | int y = touch->last_y; | |
123 | ||
124 | x &= 0xfff; | |
125 | if (touch->x_inverted) | |
126 | x = 1024 - x; | |
127 | y &= 0xfff; | |
128 | if (touch->y_inverted) | |
129 | y = 1024 - y; | |
130 | ||
131 | input_report_abs(touch->input_dev, ABS_X, x); | |
132 | input_report_abs(touch->input_dev, ABS_Y, y); | |
133 | input_report_key(touch->input_dev, BTN_TOUCH, 1); | |
134 | ||
135 | input_sync(touch->input_dev); | |
136 | } | |
137 | ||
138 | static inline void report_pen_up(struct da9034_touch *touch) | |
139 | { | |
140 | input_report_key(touch->input_dev, BTN_TOUCH, 0); | |
141 | input_sync(touch->input_dev); | |
142 | } | |
143 | ||
144 | static void da9034_event_handler(struct da9034_touch *touch, int event) | |
145 | { | |
146 | int err; | |
147 | ||
148 | switch (touch->state) { | |
149 | case STATE_IDLE: | |
150 | if (event != EVENT_PEN_DOWN) | |
151 | break; | |
152 | ||
153 | /* Enable auto measurement of the TSI, this will | |
154 | * automatically disable pen down detection | |
155 | */ | |
156 | err = start_tsi(touch); | |
157 | if (err) | |
158 | goto err_reset; | |
159 | ||
160 | touch->state = STATE_BUSY; | |
161 | break; | |
162 | ||
163 | case STATE_BUSY: | |
164 | if (event != EVENT_TSI_READY) | |
165 | break; | |
166 | ||
167 | err = read_tsi(touch); | |
168 | if (err) | |
169 | goto err_reset; | |
170 | ||
171 | /* Disable auto measurement of the TSI, so that | |
172 | * pen down status will be available | |
173 | */ | |
174 | err = stop_tsi(touch); | |
175 | if (err) | |
176 | goto err_reset; | |
177 | ||
178 | touch->state = STATE_STOP; | |
7f6d5ff2 EM |
179 | |
180 | /* FIXME: PEN_{UP/DOWN} events are expected to be | |
181 | * available by stopping TSI, but this is found not | |
182 | * always true, delay and simulate such an event | |
183 | * here is more reliable | |
184 | */ | |
185 | mdelay(1); | |
186 | da9034_event_handler(touch, | |
187 | is_pen_down(touch) ? EVENT_PEN_DOWN : | |
188 | EVENT_PEN_UP); | |
9bcc00b9 EM |
189 | break; |
190 | ||
191 | case STATE_STOP: | |
192 | if (event == EVENT_PEN_DOWN) { | |
193 | report_pen_down(touch); | |
194 | schedule_delayed_work(&touch->tsi_work, | |
195 | msecs_to_jiffies(touch->interval_ms)); | |
196 | touch->state = STATE_WAIT; | |
197 | } | |
198 | ||
199 | if (event == EVENT_PEN_UP) { | |
200 | report_pen_up(touch); | |
201 | touch->state = STATE_IDLE; | |
202 | } | |
9bcc00b9 EM |
203 | break; |
204 | ||
205 | case STATE_WAIT: | |
206 | if (event != EVENT_TIMEDOUT) | |
207 | break; | |
208 | ||
209 | if (is_pen_down(touch)) { | |
210 | start_tsi(touch); | |
211 | touch->state = STATE_BUSY; | |
7f6d5ff2 EM |
212 | } else { |
213 | report_pen_up(touch); | |
9bcc00b9 | 214 | touch->state = STATE_IDLE; |
7f6d5ff2 | 215 | } |
9bcc00b9 EM |
216 | break; |
217 | } | |
218 | return; | |
219 | ||
220 | err_reset: | |
221 | touch->state = STATE_IDLE; | |
222 | stop_tsi(touch); | |
223 | detect_pen_down(touch, 1); | |
224 | } | |
225 | ||
226 | static void da9034_tsi_work(struct work_struct *work) | |
227 | { | |
228 | struct da9034_touch *touch = | |
229 | container_of(work, struct da9034_touch, tsi_work.work); | |
230 | ||
231 | da9034_event_handler(touch, EVENT_TIMEDOUT); | |
232 | } | |
233 | ||
234 | static int da9034_touch_notifier(struct notifier_block *nb, | |
235 | unsigned long event, void *data) | |
236 | { | |
237 | struct da9034_touch *touch = | |
238 | container_of(nb, struct da9034_touch, notifier); | |
239 | ||
9bcc00b9 EM |
240 | if (event & DA9034_EVENT_TSI_READY) |
241 | da9034_event_handler(touch, EVENT_TSI_READY); | |
242 | ||
7f6d5ff2 EM |
243 | if ((event & DA9034_EVENT_PEN_DOWN) && touch->state == STATE_IDLE) |
244 | da9034_event_handler(touch, EVENT_PEN_DOWN); | |
245 | ||
9bcc00b9 EM |
246 | return 0; |
247 | } | |
248 | ||
249 | static int da9034_touch_open(struct input_dev *dev) | |
250 | { | |
251 | struct da9034_touch *touch = input_get_drvdata(dev); | |
252 | int ret; | |
253 | ||
254 | ret = da903x_register_notifier(touch->da9034_dev, &touch->notifier, | |
255 | DA9034_EVENT_PEN_DOWN | DA9034_EVENT_TSI_READY); | |
256 | if (ret) | |
257 | return -EBUSY; | |
258 | ||
259 | /* Enable ADC LDO */ | |
260 | ret = da903x_set_bits(touch->da9034_dev, | |
261 | DA9034_MANUAL_CTRL, DA9034_LDO_ADC_EN); | |
262 | if (ret) | |
263 | return ret; | |
264 | ||
265 | /* TSI_DELAY: 3 slots, TSI_SKIP: 3 slots */ | |
266 | ret = da903x_write(touch->da9034_dev, DA9034_TSI_CTRL1, 0x1b); | |
267 | if (ret) | |
268 | return ret; | |
269 | ||
270 | ret = da903x_write(touch->da9034_dev, DA9034_TSI_CTRL2, 0x00); | |
271 | if (ret) | |
272 | return ret; | |
273 | ||
274 | touch->state = STATE_IDLE; | |
275 | detect_pen_down(touch, 1); | |
276 | ||
277 | return 0; | |
278 | } | |
279 | ||
280 | static void da9034_touch_close(struct input_dev *dev) | |
281 | { | |
282 | struct da9034_touch *touch = input_get_drvdata(dev); | |
283 | ||
284 | da903x_unregister_notifier(touch->da9034_dev, &touch->notifier, | |
285 | DA9034_EVENT_PEN_DOWN | DA9034_EVENT_TSI_READY); | |
286 | ||
287 | cancel_delayed_work_sync(&touch->tsi_work); | |
288 | ||
289 | touch->state = STATE_IDLE; | |
290 | stop_tsi(touch); | |
291 | detect_pen_down(touch, 0); | |
292 | ||
293 | /* Disable ADC LDO */ | |
294 | da903x_clr_bits(touch->da9034_dev, | |
295 | DA9034_MANUAL_CTRL, DA9034_LDO_ADC_EN); | |
296 | } | |
297 | ||
298 | ||
5298cc4c | 299 | static int da9034_touch_probe(struct platform_device *pdev) |
9bcc00b9 | 300 | { |
c838cb3d | 301 | struct da9034_touch_pdata *pdata = dev_get_platdata(&pdev->dev); |
9bcc00b9 EM |
302 | struct da9034_touch *touch; |
303 | struct input_dev *input_dev; | |
4f8edc3c | 304 | int error; |
9bcc00b9 | 305 | |
4f8edc3c HS |
306 | touch = devm_kzalloc(&pdev->dev, sizeof(struct da9034_touch), |
307 | GFP_KERNEL); | |
308 | if (!touch) { | |
9bcc00b9 EM |
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; | |
4f8edc3c | 319 | } else { |
9bcc00b9 EM |
320 | /* fallback into default */ |
321 | touch->interval_ms = 10; | |
4f8edc3c | 322 | } |
9bcc00b9 EM |
323 | |
324 | INIT_DELAYED_WORK(&touch->tsi_work, da9034_tsi_work); | |
325 | touch->notifier.notifier_call = da9034_touch_notifier; | |
326 | ||
4f8edc3c | 327 | input_dev = devm_input_allocate_device(&pdev->dev); |
9bcc00b9 EM |
328 | if (!input_dev) { |
329 | dev_err(&pdev->dev, "failed to allocate input device\n"); | |
4f8edc3c | 330 | return -ENOMEM; |
9bcc00b9 EM |
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 | ||
4f8edc3c HS |
350 | error = input_register_device(input_dev); |
351 | if (error) | |
352 | return error; | |
9bcc00b9 EM |
353 | |
354 | return 0; | |
355 | } | |
356 | ||
357 | static struct platform_driver da9034_touch_driver = { | |
358 | .driver = { | |
359 | .name = "da9034-touch", | |
9bcc00b9 EM |
360 | }, |
361 | .probe = da9034_touch_probe, | |
9bcc00b9 | 362 | }; |
cdcc96e2 | 363 | module_platform_driver(da9034_touch_driver); |
9bcc00b9 EM |
364 | |
365 | MODULE_DESCRIPTION("Touchscreen driver for Dialog Semiconductor DA9034"); | |
93ff27c6 | 366 | MODULE_AUTHOR("Eric Miao <eric.miao@marvell.com>, Bin Yang <bin.yang@marvell.com>"); |
9bcc00b9 EM |
367 | MODULE_LICENSE("GPL"); |
368 | MODULE_ALIAS("platform:da9034-touch"); |