2 * Touchscreen driver for WM831x PMICs
4 * Copyright 2011 Wolfson Microelectronics plc.
5 * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
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.
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>
19 #include <linux/input.h>
20 #include <linux/interrupt.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>
30 * R16424 (0x4028) - Touch Control 1
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] */
46 * R16425 (0x4029) - Touch Control 2
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] */
57 * R16426-8 (0x402A-C) - Touch Data X/Y/X
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] */
65 struct input_dev
*input_dev
;
66 struct wm831x
*wm831x
;
67 unsigned int data_irq
;
71 struct work_struct pd_data_work
;
74 static void wm831x_pd_data_work(struct work_struct
*work
)
76 struct wm831x_ts
*wm831x_ts
=
77 container_of(work
, struct wm831x_ts
, pd_data_work
);
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");
83 enable_irq(wm831x_ts
->pd_irq
);
84 dev_dbg(wm831x_ts
->wm831x
->dev
, "IRQ DATA->PD done\n");
88 static irqreturn_t
wm831x_ts_data_irq(int irq
, void *irq_data
)
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
};
97 if (wm831x_ts
->pressure
)
102 wm831x_set_bits(wm831x
, WM831X_INTERRUPT_STATUS_1
,
103 WM831X_TCHDATA_EINT
, WM831X_TCHDATA_EINT
);
105 ret
= wm831x_bulk_read(wm831x
, WM831X_TOUCH_DATA_X
, count
,
108 dev_err(wm831x
->dev
, "Failed to read touch data: %d\n",
114 * We get a pen down reading on every reading, report pen up if any
115 * individual reading does so.
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;
123 input_report_abs(wm831x_ts
->input_dev
, data_types
[i
],
124 data
[i
] & WM831X_TCH_DATA_MASK
);
127 if (!wm831x_ts
->pen_down
) {
128 /* Switch from data to pen down */
129 dev_dbg(wm831x
->dev
, "IRQ DATA->PD\n");
131 disable_irq_nosync(wm831x_ts
->data_irq
);
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);
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
);
142 wm831x_bulk_read(wm831x
, WM831X_TOUCH_DATA_X
, count
, data
);
144 if (wm831x_ts
->pressure
)
145 input_report_abs(wm831x_ts
->input_dev
,
148 input_report_key(wm831x_ts
->input_dev
, BTN_TOUCH
, 0);
150 schedule_work(&wm831x_ts
->pd_data_work
);
153 input_sync(wm831x_ts
->input_dev
);
158 static irqreturn_t
wm831x_ts_pen_down_irq(int irq
, void *irq_data
)
160 struct wm831x_ts
*wm831x_ts
= irq_data
;
161 struct wm831x
*wm831x
= wm831x_ts
->wm831x
;
164 if (wm831x_ts
->pen_down
)
167 disable_irq_nosync(wm831x_ts
->pd_irq
);
169 /* Start collecting data */
170 if (wm831x_ts
->pressure
)
171 ena
|= WM831X_TCH_Z_ENA
;
173 wm831x_set_bits(wm831x
, WM831X_TOUCH_CONTROL_1
,
174 WM831X_TCH_X_ENA
| WM831X_TCH_Y_ENA
| WM831X_TCH_Z_ENA
,
175 WM831X_TCH_X_ENA
| WM831X_TCH_Y_ENA
| ena
);
177 input_report_key(wm831x_ts
->input_dev
, BTN_TOUCH
, 1);
178 input_sync(wm831x_ts
->input_dev
);
180 wm831x_set_bits(wm831x
, WM831X_INTERRUPT_STATUS_1
,
181 WM831X_TCHPD_EINT
, WM831X_TCHPD_EINT
);
183 wm831x_ts
->pen_down
= true;
185 /* Switch from pen down to data */
186 dev_dbg(wm831x
->dev
, "IRQ PD->DATA\n");
187 schedule_work(&wm831x_ts
->pd_data_work
);
192 static int wm831x_ts_input_open(struct input_dev
*idev
)
194 struct wm831x_ts
*wm831x_ts
= input_get_drvdata(idev
);
195 struct wm831x
*wm831x
= wm831x_ts
->wm831x
;
197 wm831x_set_bits(wm831x
, WM831X_TOUCH_CONTROL_1
,
198 WM831X_TCH_ENA
| WM831X_TCH_CVT_ENA
|
199 WM831X_TCH_X_ENA
| WM831X_TCH_Y_ENA
|
200 WM831X_TCH_Z_ENA
, WM831X_TCH_ENA
);
202 wm831x_set_bits(wm831x
, WM831X_TOUCH_CONTROL_1
,
203 WM831X_TCH_CVT_ENA
, WM831X_TCH_CVT_ENA
);
208 static void wm831x_ts_input_close(struct input_dev
*idev
)
210 struct wm831x_ts
*wm831x_ts
= input_get_drvdata(idev
);
211 struct wm831x
*wm831x
= wm831x_ts
->wm831x
;
213 /* Shut the controller down, disabling all other functionality too */
214 wm831x_set_bits(wm831x
, WM831X_TOUCH_CONTROL_1
,
215 WM831X_TCH_ENA
| WM831X_TCH_X_ENA
|
216 WM831X_TCH_Y_ENA
| WM831X_TCH_Z_ENA
, 0);
218 /* Make sure any pending IRQs are done, the above will prevent
221 synchronize_irq(wm831x_ts
->data_irq
);
222 synchronize_irq(wm831x_ts
->pd_irq
);
224 /* Make sure the IRQ completion work is quiesced */
225 flush_work_sync(&wm831x_ts
->pd_data_work
);
227 /* If we ended up with the pen down then make sure we revert back
228 * to pen detection state for the next time we start up.
230 if (wm831x_ts
->pen_down
) {
231 disable_irq(wm831x_ts
->data_irq
);
232 enable_irq(wm831x_ts
->pd_irq
);
233 wm831x_ts
->pen_down
= false;
237 static __devinit
int wm831x_ts_probe(struct platform_device
*pdev
)
239 struct wm831x_ts
*wm831x_ts
;
240 struct wm831x
*wm831x
= dev_get_drvdata(pdev
->dev
.parent
);
241 struct wm831x_pdata
*core_pdata
= dev_get_platdata(pdev
->dev
.parent
);
242 struct wm831x_touch_pdata
*pdata
= NULL
;
243 struct input_dev
*input_dev
;
247 pdata
= core_pdata
->touch
;
249 wm831x_ts
= kzalloc(sizeof(struct wm831x_ts
), GFP_KERNEL
);
250 input_dev
= input_allocate_device();
251 if (!wm831x_ts
|| !input_dev
) {
256 wm831x_ts
->wm831x
= wm831x
;
257 wm831x_ts
->input_dev
= input_dev
;
258 INIT_WORK(&wm831x_ts
->pd_data_work
, wm831x_pd_data_work
);
261 * If we have a direct IRQ use it, otherwise use the interrupt
262 * from the WM831x IRQ controller.
264 if (pdata
&& pdata
->data_irq
)
265 wm831x_ts
->data_irq
= pdata
->data_irq
;
267 wm831x_ts
->data_irq
= platform_get_irq_byname(pdev
, "TCHDATA");
269 if (pdata
&& pdata
->pd_irq
)
270 wm831x_ts
->pd_irq
= pdata
->pd_irq
;
272 wm831x_ts
->pd_irq
= platform_get_irq_byname(pdev
, "TCHPD");
275 wm831x_ts
->pressure
= pdata
->pressure
;
277 wm831x_ts
->pressure
= true;
279 /* Five wire touchscreens can't report pressure */
280 if (pdata
&& pdata
->fivewire
) {
281 wm831x_set_bits(wm831x
, WM831X_TOUCH_CONTROL_2
,
282 WM831X_TCH_5WIRE
, WM831X_TCH_5WIRE
);
284 /* Pressure measurements are not possible for five wire mode */
285 WARN_ON(pdata
->pressure
&& pdata
->fivewire
);
286 wm831x_ts
->pressure
= false;
288 wm831x_set_bits(wm831x
, WM831X_TOUCH_CONTROL_2
,
289 WM831X_TCH_5WIRE
, 0);
293 switch (pdata
->isel
) {
295 dev_err(&pdev
->dev
, "Unsupported ISEL setting: %d\n",
300 wm831x_set_bits(wm831x
, WM831X_TOUCH_CONTROL_2
,
304 wm831x_set_bits(wm831x
, WM831X_TOUCH_CONTROL_2
,
305 WM831X_TCH_ISEL
, WM831X_TCH_ISEL
);
310 wm831x_set_bits(wm831x
, WM831X_TOUCH_CONTROL_2
,
311 WM831X_TCH_PDONLY
, 0);
313 /* Default to 96 samples/sec */
314 wm831x_set_bits(wm831x
, WM831X_TOUCH_CONTROL_1
,
315 WM831X_TCH_RATE_MASK
, 6);
317 error
= request_threaded_irq(wm831x_ts
->data_irq
,
318 NULL
, wm831x_ts_data_irq
,
320 "Touchscreen data", wm831x_ts
);
322 dev_err(&pdev
->dev
, "Failed to request data IRQ %d: %d\n",
323 wm831x_ts
->data_irq
, error
);
326 disable_irq(wm831x_ts
->data_irq
);
328 error
= request_threaded_irq(wm831x_ts
->pd_irq
,
329 NULL
, wm831x_ts_pen_down_irq
,
331 "Touchscreen pen down", wm831x_ts
);
333 dev_err(&pdev
->dev
, "Failed to request pen down IRQ %d: %d\n",
334 wm831x_ts
->pd_irq
, error
);
338 /* set up touch configuration */
339 input_dev
->name
= "WM831x touchscreen";
340 input_dev
->phys
= "wm831x";
341 input_dev
->open
= wm831x_ts_input_open
;
342 input_dev
->close
= wm831x_ts_input_close
;
344 __set_bit(EV_ABS
, input_dev
->evbit
);
345 __set_bit(EV_KEY
, input_dev
->evbit
);
346 __set_bit(BTN_TOUCH
, input_dev
->keybit
);
348 input_set_abs_params(input_dev
, ABS_X
, 0, 4095, 5, 0);
349 input_set_abs_params(input_dev
, ABS_Y
, 0, 4095, 5, 0);
350 if (wm831x_ts
->pressure
)
351 input_set_abs_params(input_dev
, ABS_PRESSURE
, 0, 4095, 5, 0);
353 input_set_drvdata(input_dev
, wm831x_ts
);
354 input_dev
->dev
.parent
= &pdev
->dev
;
356 error
= input_register_device(input_dev
);
360 platform_set_drvdata(pdev
, wm831x_ts
);
364 free_irq(wm831x_ts
->pd_irq
, wm831x_ts
);
366 free_irq(wm831x_ts
->data_irq
, wm831x_ts
);
368 input_free_device(input_dev
);
374 static __devexit
int wm831x_ts_remove(struct platform_device
*pdev
)
376 struct wm831x_ts
*wm831x_ts
= platform_get_drvdata(pdev
);
378 free_irq(wm831x_ts
->pd_irq
, wm831x_ts
);
379 free_irq(wm831x_ts
->data_irq
, wm831x_ts
);
380 input_unregister_device(wm831x_ts
->input_dev
);
383 platform_set_drvdata(pdev
, NULL
);
387 static struct platform_driver wm831x_ts_driver
= {
389 .name
= "wm831x-touch",
390 .owner
= THIS_MODULE
,
392 .probe
= wm831x_ts_probe
,
393 .remove
= __devexit_p(wm831x_ts_remove
),
396 static int __init
wm831x_ts_init(void)
398 return platform_driver_register(&wm831x_ts_driver
);
400 module_init(wm831x_ts_init
);
402 static void __exit
wm831x_ts_exit(void)
404 platform_driver_unregister(&wm831x_ts_driver
);
406 module_exit(wm831x_ts_exit
);
408 /* Module information */
409 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
410 MODULE_DESCRIPTION("WM831x PMIC touchscreen driver");
411 MODULE_LICENSE("GPL");
412 MODULE_ALIAS("platform:wm831x-touch");