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00cfa730 MB |
1 | /* |
2 | * Touchscreen driver for WM831x PMICs | |
3 | * | |
4 | * Copyright 2011 Wolfson Microelectronics plc. | |
5 | * Author: Mark Brown <broonie@opensource.wolfsonmicro.com> | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify it | |
8 | * under the terms of the GNU General Public License as published by the | |
9 | * Free Software Foundation; either version 2 of the License, or (at your | |
10 | * option) any later version. | |
11 | */ | |
12 | ||
13 | #include <linux/module.h> | |
14 | #include <linux/moduleparam.h> | |
15 | #include <linux/kernel.h> | |
16 | #include <linux/init.h> | |
17 | #include <linux/string.h> | |
18 | #include <linux/pm.h> | |
19 | #include <linux/input.h> | |
20 | #include <linux/interrupt.h> | |
21 | #include <linux/io.h> | |
22 | #include <linux/mfd/wm831x/core.h> | |
23 | #include <linux/mfd/wm831x/irq.h> | |
24 | #include <linux/mfd/wm831x/pdata.h> | |
25 | #include <linux/platform_device.h> | |
26 | #include <linux/slab.h> | |
27 | #include <linux/types.h> | |
28 | ||
29 | /* | |
30 | * R16424 (0x4028) - Touch Control 1 | |
31 | */ | |
32 | #define WM831X_TCH_ENA 0x8000 /* TCH_ENA */ | |
33 | #define WM831X_TCH_CVT_ENA 0x4000 /* TCH_CVT_ENA */ | |
34 | #define WM831X_TCH_SLPENA 0x1000 /* TCH_SLPENA */ | |
35 | #define WM831X_TCH_Z_ENA 0x0400 /* TCH_Z_ENA */ | |
36 | #define WM831X_TCH_Y_ENA 0x0200 /* TCH_Y_ENA */ | |
37 | #define WM831X_TCH_X_ENA 0x0100 /* TCH_X_ENA */ | |
38 | #define WM831X_TCH_DELAY_MASK 0x00E0 /* TCH_DELAY - [7:5] */ | |
39 | #define WM831X_TCH_DELAY_SHIFT 5 /* TCH_DELAY - [7:5] */ | |
40 | #define WM831X_TCH_DELAY_WIDTH 3 /* TCH_DELAY - [7:5] */ | |
41 | #define WM831X_TCH_RATE_MASK 0x001F /* TCH_RATE - [4:0] */ | |
42 | #define WM831X_TCH_RATE_SHIFT 0 /* TCH_RATE - [4:0] */ | |
43 | #define WM831X_TCH_RATE_WIDTH 5 /* TCH_RATE - [4:0] */ | |
44 | ||
45 | /* | |
46 | * R16425 (0x4029) - Touch Control 2 | |
47 | */ | |
48 | #define WM831X_TCH_PD_WK 0x2000 /* TCH_PD_WK */ | |
49 | #define WM831X_TCH_5WIRE 0x1000 /* TCH_5WIRE */ | |
50 | #define WM831X_TCH_PDONLY 0x0800 /* TCH_PDONLY */ | |
51 | #define WM831X_TCH_ISEL 0x0100 /* TCH_ISEL */ | |
52 | #define WM831X_TCH_RPU_MASK 0x000F /* TCH_RPU - [3:0] */ | |
53 | #define WM831X_TCH_RPU_SHIFT 0 /* TCH_RPU - [3:0] */ | |
54 | #define WM831X_TCH_RPU_WIDTH 4 /* TCH_RPU - [3:0] */ | |
55 | ||
56 | /* | |
57 | * R16426-8 (0x402A-C) - Touch Data X/Y/X | |
58 | */ | |
59 | #define WM831X_TCH_PD 0x8000 /* TCH_PD1 */ | |
60 | #define WM831X_TCH_DATA_MASK 0x0FFF /* TCH_DATA - [11:0] */ | |
61 | #define WM831X_TCH_DATA_SHIFT 0 /* TCH_DATA - [11:0] */ | |
62 | #define WM831X_TCH_DATA_WIDTH 12 /* TCH_DATA - [11:0] */ | |
63 | ||
64 | struct wm831x_ts { | |
65 | struct input_dev *input_dev; | |
66 | struct wm831x *wm831x; | |
67 | unsigned int data_irq; | |
68 | unsigned int pd_irq; | |
69 | bool pressure; | |
70 | bool pen_down; | |
f5346668 | 71 | struct work_struct pd_data_work; |
00cfa730 MB |
72 | }; |
73 | ||
f5346668 MB |
74 | static void wm831x_pd_data_work(struct work_struct *work) |
75 | { | |
76 | struct wm831x_ts *wm831x_ts = | |
77 | container_of(work, struct wm831x_ts, pd_data_work); | |
78 | ||
79 | if (wm831x_ts->pen_down) { | |
80 | enable_irq(wm831x_ts->data_irq); | |
81 | dev_dbg(wm831x_ts->wm831x->dev, "IRQ PD->DATA done\n"); | |
82 | } else { | |
83 | enable_irq(wm831x_ts->pd_irq); | |
84 | dev_dbg(wm831x_ts->wm831x->dev, "IRQ DATA->PD done\n"); | |
85 | } | |
86 | } | |
87 | ||
00cfa730 MB |
88 | static irqreturn_t wm831x_ts_data_irq(int irq, void *irq_data) |
89 | { | |
90 | struct wm831x_ts *wm831x_ts = irq_data; | |
91 | struct wm831x *wm831x = wm831x_ts->wm831x; | |
92 | static int data_types[] = { ABS_X, ABS_Y, ABS_PRESSURE }; | |
93 | u16 data[3]; | |
723d9284 | 94 | int count; |
00cfa730 MB |
95 | int i, ret; |
96 | ||
723d9284 MB |
97 | if (wm831x_ts->pressure) |
98 | count = 3; | |
99 | else | |
100 | count = 2; | |
101 | ||
00cfa730 MB |
102 | wm831x_set_bits(wm831x, WM831X_INTERRUPT_STATUS_1, |
103 | WM831X_TCHDATA_EINT, WM831X_TCHDATA_EINT); | |
104 | ||
105 | ret = wm831x_bulk_read(wm831x, WM831X_TOUCH_DATA_X, count, | |
106 | data); | |
107 | if (ret != 0) { | |
108 | dev_err(wm831x->dev, "Failed to read touch data: %d\n", | |
109 | ret); | |
110 | return IRQ_NONE; | |
111 | } | |
112 | ||
113 | /* | |
114 | * We get a pen down reading on every reading, report pen up if any | |
115 | * individual reading does so. | |
116 | */ | |
117 | wm831x_ts->pen_down = true; | |
118 | for (i = 0; i < count; i++) { | |
119 | if (!(data[i] & WM831X_TCH_PD)) { | |
120 | wm831x_ts->pen_down = false; | |
121 | continue; | |
122 | } | |
123 | input_report_abs(wm831x_ts->input_dev, data_types[i], | |
124 | data[i] & WM831X_TCH_DATA_MASK); | |
125 | } | |
126 | ||
127 | if (!wm831x_ts->pen_down) { | |
f5346668 MB |
128 | /* Switch from data to pen down */ |
129 | dev_dbg(wm831x->dev, "IRQ DATA->PD\n"); | |
130 | ||
00cfa730 MB |
131 | disable_irq_nosync(wm831x_ts->data_irq); |
132 | ||
133 | /* Don't need data any more */ | |
134 | wm831x_set_bits(wm831x, WM831X_TOUCH_CONTROL_1, | |
135 | WM831X_TCH_X_ENA | WM831X_TCH_Y_ENA | | |
136 | WM831X_TCH_Z_ENA, 0); | |
137 | ||
138 | /* Flush any final samples that arrived while reading */ | |
139 | wm831x_set_bits(wm831x, WM831X_INTERRUPT_STATUS_1, | |
140 | WM831X_TCHDATA_EINT, WM831X_TCHDATA_EINT); | |
141 | ||
142 | wm831x_bulk_read(wm831x, WM831X_TOUCH_DATA_X, count, data); | |
143 | ||
144 | if (wm831x_ts->pressure) | |
145 | input_report_abs(wm831x_ts->input_dev, | |
146 | ABS_PRESSURE, 0); | |
147 | ||
148 | input_report_key(wm831x_ts->input_dev, BTN_TOUCH, 0); | |
f5346668 MB |
149 | |
150 | schedule_work(&wm831x_ts->pd_data_work); | |
bf283707 MB |
151 | } else { |
152 | input_report_key(wm831x_ts->input_dev, BTN_TOUCH, 1); | |
00cfa730 MB |
153 | } |
154 | ||
155 | input_sync(wm831x_ts->input_dev); | |
156 | ||
157 | return IRQ_HANDLED; | |
158 | } | |
159 | ||
160 | static irqreturn_t wm831x_ts_pen_down_irq(int irq, void *irq_data) | |
161 | { | |
162 | struct wm831x_ts *wm831x_ts = irq_data; | |
163 | struct wm831x *wm831x = wm831x_ts->wm831x; | |
723d9284 | 164 | int ena = 0; |
00cfa730 | 165 | |
f5346668 MB |
166 | if (wm831x_ts->pen_down) |
167 | return IRQ_HANDLED; | |
168 | ||
169 | disable_irq_nosync(wm831x_ts->pd_irq); | |
170 | ||
00cfa730 | 171 | /* Start collecting data */ |
723d9284 MB |
172 | if (wm831x_ts->pressure) |
173 | ena |= WM831X_TCH_Z_ENA; | |
00cfa730 MB |
174 | |
175 | wm831x_set_bits(wm831x, WM831X_TOUCH_CONTROL_1, | |
176 | WM831X_TCH_X_ENA | WM831X_TCH_Y_ENA | WM831X_TCH_Z_ENA, | |
177 | WM831X_TCH_X_ENA | WM831X_TCH_Y_ENA | ena); | |
178 | ||
00cfa730 MB |
179 | wm831x_set_bits(wm831x, WM831X_INTERRUPT_STATUS_1, |
180 | WM831X_TCHPD_EINT, WM831X_TCHPD_EINT); | |
181 | ||
182 | wm831x_ts->pen_down = true; | |
f5346668 MB |
183 | |
184 | /* Switch from pen down to data */ | |
185 | dev_dbg(wm831x->dev, "IRQ PD->DATA\n"); | |
186 | schedule_work(&wm831x_ts->pd_data_work); | |
00cfa730 MB |
187 | |
188 | return IRQ_HANDLED; | |
189 | } | |
190 | ||
191 | static int wm831x_ts_input_open(struct input_dev *idev) | |
192 | { | |
193 | struct wm831x_ts *wm831x_ts = input_get_drvdata(idev); | |
194 | struct wm831x *wm831x = wm831x_ts->wm831x; | |
195 | ||
196 | wm831x_set_bits(wm831x, WM831X_TOUCH_CONTROL_1, | |
e7cbb90a MB |
197 | WM831X_TCH_ENA | WM831X_TCH_CVT_ENA | |
198 | WM831X_TCH_X_ENA | WM831X_TCH_Y_ENA | | |
199 | WM831X_TCH_Z_ENA, WM831X_TCH_ENA); | |
00cfa730 MB |
200 | |
201 | wm831x_set_bits(wm831x, WM831X_TOUCH_CONTROL_1, | |
202 | WM831X_TCH_CVT_ENA, WM831X_TCH_CVT_ENA); | |
203 | ||
204 | return 0; | |
205 | } | |
206 | ||
207 | static void wm831x_ts_input_close(struct input_dev *idev) | |
208 | { | |
209 | struct wm831x_ts *wm831x_ts = input_get_drvdata(idev); | |
210 | struct wm831x *wm831x = wm831x_ts->wm831x; | |
211 | ||
f5346668 | 212 | /* Shut the controller down, disabling all other functionality too */ |
00cfa730 | 213 | wm831x_set_bits(wm831x, WM831X_TOUCH_CONTROL_1, |
f5346668 MB |
214 | WM831X_TCH_ENA | WM831X_TCH_X_ENA | |
215 | WM831X_TCH_Y_ENA | WM831X_TCH_Z_ENA, 0); | |
00cfa730 | 216 | |
f5346668 MB |
217 | /* Make sure any pending IRQs are done, the above will prevent |
218 | * new ones firing. | |
219 | */ | |
220 | synchronize_irq(wm831x_ts->data_irq); | |
221 | synchronize_irq(wm831x_ts->pd_irq); | |
222 | ||
223 | /* Make sure the IRQ completion work is quiesced */ | |
43829731 | 224 | flush_work(&wm831x_ts->pd_data_work); |
f5346668 MB |
225 | |
226 | /* If we ended up with the pen down then make sure we revert back | |
227 | * to pen detection state for the next time we start up. | |
228 | */ | |
229 | if (wm831x_ts->pen_down) { | |
00cfa730 | 230 | disable_irq(wm831x_ts->data_irq); |
f5346668 MB |
231 | enable_irq(wm831x_ts->pd_irq); |
232 | wm831x_ts->pen_down = false; | |
233 | } | |
00cfa730 MB |
234 | } |
235 | ||
236 | static __devinit int wm831x_ts_probe(struct platform_device *pdev) | |
237 | { | |
238 | struct wm831x_ts *wm831x_ts; | |
239 | struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent); | |
240 | struct wm831x_pdata *core_pdata = dev_get_platdata(pdev->dev.parent); | |
723d9284 | 241 | struct wm831x_touch_pdata *pdata = NULL; |
00cfa730 | 242 | struct input_dev *input_dev; |
acad9853 | 243 | int error, irqf; |
00cfa730 | 244 | |
723d9284 MB |
245 | if (core_pdata) |
246 | pdata = core_pdata->touch; | |
247 | ||
ef8dee5c MB |
248 | wm831x_ts = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_ts), |
249 | GFP_KERNEL); | |
00cfa730 MB |
250 | input_dev = input_allocate_device(); |
251 | if (!wm831x_ts || !input_dev) { | |
252 | error = -ENOMEM; | |
253 | goto err_alloc; | |
254 | } | |
255 | ||
256 | wm831x_ts->wm831x = wm831x; | |
257 | wm831x_ts->input_dev = input_dev; | |
f5346668 | 258 | INIT_WORK(&wm831x_ts->pd_data_work, wm831x_pd_data_work); |
00cfa730 MB |
259 | |
260 | /* | |
261 | * If we have a direct IRQ use it, otherwise use the interrupt | |
262 | * from the WM831x IRQ controller. | |
263 | */ | |
cd99758b MB |
264 | wm831x_ts->data_irq = wm831x_irq(wm831x, |
265 | platform_get_irq_byname(pdev, | |
266 | "TCHDATA")); | |
00cfa730 MB |
267 | if (pdata && pdata->data_irq) |
268 | wm831x_ts->data_irq = pdata->data_irq; | |
00cfa730 | 269 | |
cd99758b MB |
270 | wm831x_ts->pd_irq = wm831x_irq(wm831x, |
271 | platform_get_irq_byname(pdev, "TCHPD")); | |
00cfa730 MB |
272 | if (pdata && pdata->pd_irq) |
273 | wm831x_ts->pd_irq = pdata->pd_irq; | |
00cfa730 | 274 | |
23c483d2 MB |
275 | if (pdata) |
276 | wm831x_ts->pressure = pdata->pressure; | |
277 | else | |
278 | wm831x_ts->pressure = true; | |
00cfa730 MB |
279 | |
280 | /* Five wire touchscreens can't report pressure */ | |
281 | if (pdata && pdata->fivewire) { | |
282 | wm831x_set_bits(wm831x, WM831X_TOUCH_CONTROL_2, | |
283 | WM831X_TCH_5WIRE, WM831X_TCH_5WIRE); | |
284 | ||
285 | /* Pressure measurements are not possible for five wire mode */ | |
286 | WARN_ON(pdata->pressure && pdata->fivewire); | |
287 | wm831x_ts->pressure = false; | |
288 | } else { | |
289 | wm831x_set_bits(wm831x, WM831X_TOUCH_CONTROL_2, | |
290 | WM831X_TCH_5WIRE, 0); | |
291 | } | |
292 | ||
293 | if (pdata) { | |
294 | switch (pdata->isel) { | |
295 | default: | |
296 | dev_err(&pdev->dev, "Unsupported ISEL setting: %d\n", | |
297 | pdata->isel); | |
298 | /* Fall through */ | |
299 | case 200: | |
300 | case 0: | |
301 | wm831x_set_bits(wm831x, WM831X_TOUCH_CONTROL_2, | |
302 | WM831X_TCH_ISEL, 0); | |
303 | break; | |
304 | case 400: | |
305 | wm831x_set_bits(wm831x, WM831X_TOUCH_CONTROL_2, | |
306 | WM831X_TCH_ISEL, WM831X_TCH_ISEL); | |
307 | break; | |
308 | } | |
309 | } | |
310 | ||
311 | wm831x_set_bits(wm831x, WM831X_TOUCH_CONTROL_2, | |
312 | WM831X_TCH_PDONLY, 0); | |
313 | ||
314 | /* Default to 96 samples/sec */ | |
315 | wm831x_set_bits(wm831x, WM831X_TOUCH_CONTROL_1, | |
316 | WM831X_TCH_RATE_MASK, 6); | |
317 | ||
acad9853 MB |
318 | if (pdata && pdata->data_irqf) |
319 | irqf = pdata->data_irqf; | |
320 | else | |
321 | irqf = IRQF_TRIGGER_HIGH; | |
322 | ||
00cfa730 MB |
323 | error = request_threaded_irq(wm831x_ts->data_irq, |
324 | NULL, wm831x_ts_data_irq, | |
acad9853 | 325 | irqf | IRQF_ONESHOT, |
00cfa730 MB |
326 | "Touchscreen data", wm831x_ts); |
327 | if (error) { | |
328 | dev_err(&pdev->dev, "Failed to request data IRQ %d: %d\n", | |
329 | wm831x_ts->data_irq, error); | |
330 | goto err_alloc; | |
331 | } | |
332 | disable_irq(wm831x_ts->data_irq); | |
333 | ||
acad9853 MB |
334 | if (pdata && pdata->pd_irqf) |
335 | irqf = pdata->pd_irqf; | |
336 | else | |
337 | irqf = IRQF_TRIGGER_HIGH; | |
338 | ||
00cfa730 MB |
339 | error = request_threaded_irq(wm831x_ts->pd_irq, |
340 | NULL, wm831x_ts_pen_down_irq, | |
acad9853 | 341 | irqf | IRQF_ONESHOT, |
00cfa730 MB |
342 | "Touchscreen pen down", wm831x_ts); |
343 | if (error) { | |
344 | dev_err(&pdev->dev, "Failed to request pen down IRQ %d: %d\n", | |
345 | wm831x_ts->pd_irq, error); | |
346 | goto err_data_irq; | |
347 | } | |
348 | ||
349 | /* set up touch configuration */ | |
350 | input_dev->name = "WM831x touchscreen"; | |
351 | input_dev->phys = "wm831x"; | |
352 | input_dev->open = wm831x_ts_input_open; | |
353 | input_dev->close = wm831x_ts_input_close; | |
354 | ||
355 | __set_bit(EV_ABS, input_dev->evbit); | |
356 | __set_bit(EV_KEY, input_dev->evbit); | |
357 | __set_bit(BTN_TOUCH, input_dev->keybit); | |
358 | ||
359 | input_set_abs_params(input_dev, ABS_X, 0, 4095, 5, 0); | |
360 | input_set_abs_params(input_dev, ABS_Y, 0, 4095, 5, 0); | |
361 | if (wm831x_ts->pressure) | |
362 | input_set_abs_params(input_dev, ABS_PRESSURE, 0, 4095, 5, 0); | |
363 | ||
364 | input_set_drvdata(input_dev, wm831x_ts); | |
365 | input_dev->dev.parent = &pdev->dev; | |
366 | ||
367 | error = input_register_device(input_dev); | |
368 | if (error) | |
369 | goto err_pd_irq; | |
370 | ||
371 | platform_set_drvdata(pdev, wm831x_ts); | |
372 | return 0; | |
373 | ||
374 | err_pd_irq: | |
375 | free_irq(wm831x_ts->pd_irq, wm831x_ts); | |
376 | err_data_irq: | |
377 | free_irq(wm831x_ts->data_irq, wm831x_ts); | |
378 | err_alloc: | |
379 | input_free_device(input_dev); | |
00cfa730 MB |
380 | |
381 | return error; | |
382 | } | |
383 | ||
384 | static __devexit int wm831x_ts_remove(struct platform_device *pdev) | |
385 | { | |
386 | struct wm831x_ts *wm831x_ts = platform_get_drvdata(pdev); | |
387 | ||
388 | free_irq(wm831x_ts->pd_irq, wm831x_ts); | |
389 | free_irq(wm831x_ts->data_irq, wm831x_ts); | |
390 | input_unregister_device(wm831x_ts->input_dev); | |
00cfa730 | 391 | |
00cfa730 MB |
392 | return 0; |
393 | } | |
394 | ||
395 | static struct platform_driver wm831x_ts_driver = { | |
396 | .driver = { | |
397 | .name = "wm831x-touch", | |
398 | .owner = THIS_MODULE, | |
399 | }, | |
400 | .probe = wm831x_ts_probe, | |
1cb0aa88 | 401 | .remove = wm831x_ts_remove, |
00cfa730 | 402 | }; |
cdcc96e2 | 403 | module_platform_driver(wm831x_ts_driver); |
00cfa730 MB |
404 | |
405 | /* Module information */ | |
406 | MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>"); | |
407 | MODULE_DESCRIPTION("WM831x PMIC touchscreen driver"); | |
408 | MODULE_LICENSE("GPL"); | |
409 | MODULE_ALIAS("platform:wm831x-touch"); |