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d2912cb1 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
9bcc00b9 EM |
2 | /* |
3 | * Touchscreen driver for Dialog Semiconductor DA9034 | |
4 | * | |
5 | * Copyright (C) 2006-2008 Marvell International Ltd. | |
6 | * Fengwei Yin <fengwei.yin@marvell.com> | |
93ff27c6 | 7 | * Bin Yang <bin.yang@marvell.com> |
9bcc00b9 | 8 | * Eric Miao <eric.miao@marvell.com> |
9bcc00b9 EM |
9 | */ |
10 | ||
11 | #include <linux/module.h> | |
12 | #include <linux/kernel.h> | |
9bcc00b9 EM |
13 | #include <linux/delay.h> |
14 | #include <linux/platform_device.h> | |
15 | #include <linux/input.h> | |
30aafdba | 16 | #include <linux/workqueue.h> |
9bcc00b9 | 17 | #include <linux/mfd/da903x.h> |
5a0e3ad6 | 18 | #include <linux/slab.h> |
9bcc00b9 EM |
19 | |
20 | #define DA9034_MANUAL_CTRL 0x50 | |
21 | #define DA9034_LDO_ADC_EN (1 << 4) | |
22 | ||
23 | #define DA9034_AUTO_CTRL1 0x51 | |
24 | ||
25 | #define DA9034_AUTO_CTRL2 0x52 | |
26 | #define DA9034_AUTO_TSI_EN (1 << 3) | |
27 | #define DA9034_PEN_DETECT (1 << 4) | |
28 | ||
29 | #define DA9034_TSI_CTRL1 0x53 | |
30 | #define DA9034_TSI_CTRL2 0x54 | |
31 | #define DA9034_TSI_X_MSB 0x6c | |
32 | #define DA9034_TSI_Y_MSB 0x6d | |
33 | #define DA9034_TSI_XY_LSB 0x6e | |
34 | ||
35 | enum { | |
36 | STATE_IDLE, /* wait for pendown */ | |
37 | STATE_BUSY, /* TSI busy sampling */ | |
38 | STATE_STOP, /* sample available */ | |
39 | STATE_WAIT, /* Wait to start next sample */ | |
40 | }; | |
41 | ||
42 | enum { | |
43 | EVENT_PEN_DOWN, | |
44 | EVENT_PEN_UP, | |
45 | EVENT_TSI_READY, | |
46 | EVENT_TIMEDOUT, | |
47 | }; | |
48 | ||
49 | struct da9034_touch { | |
50 | struct device *da9034_dev; | |
51 | struct input_dev *input_dev; | |
52 | ||
53 | struct delayed_work tsi_work; | |
54 | struct notifier_block notifier; | |
55 | ||
56 | int state; | |
57 | ||
58 | int interval_ms; | |
59 | int x_inverted; | |
60 | int y_inverted; | |
61 | ||
62 | int last_x; | |
63 | int last_y; | |
64 | }; | |
65 | ||
66 | static inline int is_pen_down(struct da9034_touch *touch) | |
67 | { | |
68 | return da903x_query_status(touch->da9034_dev, DA9034_STATUS_PEN_DOWN); | |
69 | } | |
70 | ||
71 | static inline int detect_pen_down(struct da9034_touch *touch, int on) | |
72 | { | |
73 | if (on) | |
74 | return da903x_set_bits(touch->da9034_dev, | |
75 | DA9034_AUTO_CTRL2, DA9034_PEN_DETECT); | |
76 | else | |
77 | return da903x_clr_bits(touch->da9034_dev, | |
78 | DA9034_AUTO_CTRL2, DA9034_PEN_DETECT); | |
79 | } | |
80 | ||
81 | static int read_tsi(struct da9034_touch *touch) | |
82 | { | |
83 | uint8_t _x, _y, _v; | |
84 | int ret; | |
85 | ||
86 | ret = da903x_read(touch->da9034_dev, DA9034_TSI_X_MSB, &_x); | |
87 | if (ret) | |
88 | return ret; | |
89 | ||
90 | ret = da903x_read(touch->da9034_dev, DA9034_TSI_Y_MSB, &_y); | |
91 | if (ret) | |
92 | return ret; | |
93 | ||
94 | ret = da903x_read(touch->da9034_dev, DA9034_TSI_XY_LSB, &_v); | |
95 | if (ret) | |
96 | return ret; | |
97 | ||
98 | touch->last_x = ((_x << 2) & 0x3fc) | (_v & 0x3); | |
99 | touch->last_y = ((_y << 2) & 0x3fc) | ((_v & 0xc) >> 2); | |
100 | ||
101 | return 0; | |
102 | } | |
103 | ||
104 | static inline int start_tsi(struct da9034_touch *touch) | |
105 | { | |
106 | return da903x_set_bits(touch->da9034_dev, | |
107 | DA9034_AUTO_CTRL2, DA9034_AUTO_TSI_EN); | |
108 | } | |
109 | ||
110 | static inline int stop_tsi(struct da9034_touch *touch) | |
111 | { | |
112 | return da903x_clr_bits(touch->da9034_dev, | |
113 | DA9034_AUTO_CTRL2, DA9034_AUTO_TSI_EN); | |
114 | } | |
115 | ||
116 | static inline void report_pen_down(struct da9034_touch *touch) | |
117 | { | |
118 | int x = touch->last_x; | |
119 | int y = touch->last_y; | |
120 | ||
121 | x &= 0xfff; | |
122 | if (touch->x_inverted) | |
123 | x = 1024 - x; | |
124 | y &= 0xfff; | |
125 | if (touch->y_inverted) | |
126 | y = 1024 - y; | |
127 | ||
128 | input_report_abs(touch->input_dev, ABS_X, x); | |
129 | input_report_abs(touch->input_dev, ABS_Y, y); | |
130 | input_report_key(touch->input_dev, BTN_TOUCH, 1); | |
131 | ||
132 | input_sync(touch->input_dev); | |
133 | } | |
134 | ||
135 | static inline void report_pen_up(struct da9034_touch *touch) | |
136 | { | |
137 | input_report_key(touch->input_dev, BTN_TOUCH, 0); | |
138 | input_sync(touch->input_dev); | |
139 | } | |
140 | ||
141 | static void da9034_event_handler(struct da9034_touch *touch, int event) | |
142 | { | |
143 | int err; | |
144 | ||
145 | switch (touch->state) { | |
146 | case STATE_IDLE: | |
147 | if (event != EVENT_PEN_DOWN) | |
148 | break; | |
149 | ||
150 | /* Enable auto measurement of the TSI, this will | |
151 | * automatically disable pen down detection | |
152 | */ | |
153 | err = start_tsi(touch); | |
154 | if (err) | |
155 | goto err_reset; | |
156 | ||
157 | touch->state = STATE_BUSY; | |
158 | break; | |
159 | ||
160 | case STATE_BUSY: | |
161 | if (event != EVENT_TSI_READY) | |
162 | break; | |
163 | ||
164 | err = read_tsi(touch); | |
165 | if (err) | |
166 | goto err_reset; | |
167 | ||
168 | /* Disable auto measurement of the TSI, so that | |
169 | * pen down status will be available | |
170 | */ | |
171 | err = stop_tsi(touch); | |
172 | if (err) | |
173 | goto err_reset; | |
174 | ||
175 | touch->state = STATE_STOP; | |
7f6d5ff2 EM |
176 | |
177 | /* FIXME: PEN_{UP/DOWN} events are expected to be | |
178 | * available by stopping TSI, but this is found not | |
179 | * always true, delay and simulate such an event | |
180 | * here is more reliable | |
181 | */ | |
182 | mdelay(1); | |
183 | da9034_event_handler(touch, | |
184 | is_pen_down(touch) ? EVENT_PEN_DOWN : | |
185 | EVENT_PEN_UP); | |
9bcc00b9 EM |
186 | break; |
187 | ||
188 | case STATE_STOP: | |
189 | if (event == EVENT_PEN_DOWN) { | |
190 | report_pen_down(touch); | |
191 | schedule_delayed_work(&touch->tsi_work, | |
192 | msecs_to_jiffies(touch->interval_ms)); | |
193 | touch->state = STATE_WAIT; | |
194 | } | |
195 | ||
196 | if (event == EVENT_PEN_UP) { | |
197 | report_pen_up(touch); | |
198 | touch->state = STATE_IDLE; | |
199 | } | |
9bcc00b9 EM |
200 | break; |
201 | ||
202 | case STATE_WAIT: | |
203 | if (event != EVENT_TIMEDOUT) | |
204 | break; | |
205 | ||
206 | if (is_pen_down(touch)) { | |
207 | start_tsi(touch); | |
208 | touch->state = STATE_BUSY; | |
7f6d5ff2 EM |
209 | } else { |
210 | report_pen_up(touch); | |
9bcc00b9 | 211 | touch->state = STATE_IDLE; |
7f6d5ff2 | 212 | } |
9bcc00b9 EM |
213 | break; |
214 | } | |
215 | return; | |
216 | ||
217 | err_reset: | |
218 | touch->state = STATE_IDLE; | |
219 | stop_tsi(touch); | |
220 | detect_pen_down(touch, 1); | |
221 | } | |
222 | ||
223 | static void da9034_tsi_work(struct work_struct *work) | |
224 | { | |
225 | struct da9034_touch *touch = | |
226 | container_of(work, struct da9034_touch, tsi_work.work); | |
227 | ||
228 | da9034_event_handler(touch, EVENT_TIMEDOUT); | |
229 | } | |
230 | ||
231 | static int da9034_touch_notifier(struct notifier_block *nb, | |
232 | unsigned long event, void *data) | |
233 | { | |
234 | struct da9034_touch *touch = | |
235 | container_of(nb, struct da9034_touch, notifier); | |
236 | ||
9bcc00b9 EM |
237 | if (event & DA9034_EVENT_TSI_READY) |
238 | da9034_event_handler(touch, EVENT_TSI_READY); | |
239 | ||
7f6d5ff2 EM |
240 | if ((event & DA9034_EVENT_PEN_DOWN) && touch->state == STATE_IDLE) |
241 | da9034_event_handler(touch, EVENT_PEN_DOWN); | |
242 | ||
9bcc00b9 EM |
243 | return 0; |
244 | } | |
245 | ||
246 | static int da9034_touch_open(struct input_dev *dev) | |
247 | { | |
248 | struct da9034_touch *touch = input_get_drvdata(dev); | |
249 | int ret; | |
250 | ||
251 | ret = da903x_register_notifier(touch->da9034_dev, &touch->notifier, | |
252 | DA9034_EVENT_PEN_DOWN | DA9034_EVENT_TSI_READY); | |
253 | if (ret) | |
254 | return -EBUSY; | |
255 | ||
256 | /* Enable ADC LDO */ | |
257 | ret = da903x_set_bits(touch->da9034_dev, | |
258 | DA9034_MANUAL_CTRL, DA9034_LDO_ADC_EN); | |
259 | if (ret) | |
260 | return ret; | |
261 | ||
262 | /* TSI_DELAY: 3 slots, TSI_SKIP: 3 slots */ | |
263 | ret = da903x_write(touch->da9034_dev, DA9034_TSI_CTRL1, 0x1b); | |
264 | if (ret) | |
265 | return ret; | |
266 | ||
267 | ret = da903x_write(touch->da9034_dev, DA9034_TSI_CTRL2, 0x00); | |
268 | if (ret) | |
269 | return ret; | |
270 | ||
271 | touch->state = STATE_IDLE; | |
272 | detect_pen_down(touch, 1); | |
273 | ||
274 | return 0; | |
275 | } | |
276 | ||
277 | static void da9034_touch_close(struct input_dev *dev) | |
278 | { | |
279 | struct da9034_touch *touch = input_get_drvdata(dev); | |
280 | ||
281 | da903x_unregister_notifier(touch->da9034_dev, &touch->notifier, | |
282 | DA9034_EVENT_PEN_DOWN | DA9034_EVENT_TSI_READY); | |
283 | ||
284 | cancel_delayed_work_sync(&touch->tsi_work); | |
285 | ||
286 | touch->state = STATE_IDLE; | |
287 | stop_tsi(touch); | |
288 | detect_pen_down(touch, 0); | |
289 | ||
290 | /* Disable ADC LDO */ | |
291 | da903x_clr_bits(touch->da9034_dev, | |
292 | DA9034_MANUAL_CTRL, DA9034_LDO_ADC_EN); | |
293 | } | |
294 | ||
295 | ||
5298cc4c | 296 | static int da9034_touch_probe(struct platform_device *pdev) |
9bcc00b9 | 297 | { |
c838cb3d | 298 | struct da9034_touch_pdata *pdata = dev_get_platdata(&pdev->dev); |
9bcc00b9 EM |
299 | struct da9034_touch *touch; |
300 | struct input_dev *input_dev; | |
4f8edc3c | 301 | int error; |
9bcc00b9 | 302 | |
4f8edc3c HS |
303 | touch = devm_kzalloc(&pdev->dev, sizeof(struct da9034_touch), |
304 | GFP_KERNEL); | |
305 | if (!touch) { | |
9bcc00b9 EM |
306 | dev_err(&pdev->dev, "failed to allocate driver data\n"); |
307 | return -ENOMEM; | |
308 | } | |
309 | ||
310 | touch->da9034_dev = pdev->dev.parent; | |
311 | ||
312 | if (pdata) { | |
313 | touch->interval_ms = pdata->interval_ms; | |
314 | touch->x_inverted = pdata->x_inverted; | |
315 | touch->y_inverted = pdata->y_inverted; | |
4f8edc3c | 316 | } else { |
9bcc00b9 EM |
317 | /* fallback into default */ |
318 | touch->interval_ms = 10; | |
4f8edc3c | 319 | } |
9bcc00b9 EM |
320 | |
321 | INIT_DELAYED_WORK(&touch->tsi_work, da9034_tsi_work); | |
322 | touch->notifier.notifier_call = da9034_touch_notifier; | |
323 | ||
4f8edc3c | 324 | input_dev = devm_input_allocate_device(&pdev->dev); |
9bcc00b9 EM |
325 | if (!input_dev) { |
326 | dev_err(&pdev->dev, "failed to allocate input device\n"); | |
4f8edc3c | 327 | return -ENOMEM; |
9bcc00b9 EM |
328 | } |
329 | ||
330 | input_dev->name = pdev->name; | |
331 | input_dev->open = da9034_touch_open; | |
332 | input_dev->close = da9034_touch_close; | |
333 | input_dev->dev.parent = &pdev->dev; | |
334 | ||
335 | __set_bit(EV_ABS, input_dev->evbit); | |
336 | __set_bit(ABS_X, input_dev->absbit); | |
337 | __set_bit(ABS_Y, input_dev->absbit); | |
338 | input_set_abs_params(input_dev, ABS_X, 0, 1023, 0, 0); | |
339 | input_set_abs_params(input_dev, ABS_Y, 0, 1023, 0, 0); | |
340 | ||
341 | __set_bit(EV_KEY, input_dev->evbit); | |
342 | __set_bit(BTN_TOUCH, input_dev->keybit); | |
343 | ||
344 | touch->input_dev = input_dev; | |
345 | input_set_drvdata(input_dev, touch); | |
346 | ||
4f8edc3c HS |
347 | error = input_register_device(input_dev); |
348 | if (error) | |
349 | return error; | |
9bcc00b9 EM |
350 | |
351 | return 0; | |
352 | } | |
353 | ||
354 | static struct platform_driver da9034_touch_driver = { | |
355 | .driver = { | |
356 | .name = "da9034-touch", | |
9bcc00b9 EM |
357 | }, |
358 | .probe = da9034_touch_probe, | |
9bcc00b9 | 359 | }; |
cdcc96e2 | 360 | module_platform_driver(da9034_touch_driver); |
9bcc00b9 EM |
361 | |
362 | MODULE_DESCRIPTION("Touchscreen driver for Dialog Semiconductor DA9034"); | |
93ff27c6 | 363 | MODULE_AUTHOR("Eric Miao <eric.miao@marvell.com>, Bin Yang <bin.yang@marvell.com>"); |
9bcc00b9 EM |
364 | MODULE_LICENSE("GPL"); |
365 | MODULE_ALIAS("platform:da9034-touch"); |