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authorLuotao Fu <l.fu@pengutronix.de>2010-07-02 08:10:29 -0400
committerSamuel Ortiz <sameo@linux.intel.com>2010-08-12 05:27:56 -0400
commitf94add3bd4468939ae5ea639b34a173534a0c135 (patch)
treee450bb9ff92035d781721236b0a6e5c212df925b
parent76f10845318b8c1baa8a2249f274ff847f31af5a (diff)
input: STMPE touch controller support
This one adds a driver for STMPE touchscreen controllers. This driver depends on the stmpexxx mfd core driver. Signed-off-by: Luotao Fu <l.fu@pengutronix.de> Acked-by: Dmitry Torokhov <dtor@mail.ru> Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
-rw-r--r--drivers/input/touchscreen/Kconfig10
-rw-r--r--drivers/input/touchscreen/Makefile1
-rw-r--r--drivers/input/touchscreen/stmpe-ts.c397
3 files changed, 408 insertions, 0 deletions
diff --git a/drivers/input/touchscreen/Kconfig b/drivers/input/touchscreen/Kconfig
index 61f35184f76c..0069d9703fda 100644
--- a/drivers/input/touchscreen/Kconfig
+++ b/drivers/input/touchscreen/Kconfig
@@ -628,4 +628,14 @@ config TOUCHSCREEN_TPS6507X
628 To compile this driver as a module, choose M here: the 628 To compile this driver as a module, choose M here: the
629 module will be called tps6507x_ts. 629 module will be called tps6507x_ts.
630 630
631config TOUCHSCREEN_STMPE
632 tristate "STMicroelectronics STMPE touchscreens"
633 depends on MFD_STMPE
634 help
635 Say Y here if you want support for STMicroelectronics
636 STMPE touchscreen controllers.
637
638 To compile this driver as a module, choose M here: the
639 module will be called stmpe-ts.
640
631endif 641endif
diff --git a/drivers/input/touchscreen/Makefile b/drivers/input/touchscreen/Makefile
index bd6f30b4ff70..28217e1dcafd 100644
--- a/drivers/input/touchscreen/Makefile
+++ b/drivers/input/touchscreen/Makefile
@@ -36,6 +36,7 @@ obj-$(CONFIG_TOUCHSCREEN_PCAP) += pcap_ts.o
36obj-$(CONFIG_TOUCHSCREEN_PENMOUNT) += penmount.o 36obj-$(CONFIG_TOUCHSCREEN_PENMOUNT) += penmount.o
37obj-$(CONFIG_TOUCHSCREEN_QT602240) += qt602240_ts.o 37obj-$(CONFIG_TOUCHSCREEN_QT602240) += qt602240_ts.o
38obj-$(CONFIG_TOUCHSCREEN_S3C2410) += s3c2410_ts.o 38obj-$(CONFIG_TOUCHSCREEN_S3C2410) += s3c2410_ts.o
39obj-$(CONFIG_TOUCHSCREEN_STMPE) += stmpe-ts.o
39obj-$(CONFIG_TOUCHSCREEN_TOUCHIT213) += touchit213.o 40obj-$(CONFIG_TOUCHSCREEN_TOUCHIT213) += touchit213.o
40obj-$(CONFIG_TOUCHSCREEN_TOUCHRIGHT) += touchright.o 41obj-$(CONFIG_TOUCHSCREEN_TOUCHRIGHT) += touchright.o
41obj-$(CONFIG_TOUCHSCREEN_TOUCHWIN) += touchwin.o 42obj-$(CONFIG_TOUCHSCREEN_TOUCHWIN) += touchwin.o
diff --git a/drivers/input/touchscreen/stmpe-ts.c b/drivers/input/touchscreen/stmpe-ts.c
new file mode 100644
index 000000000000..77f4374b216d
--- /dev/null
+++ b/drivers/input/touchscreen/stmpe-ts.c
@@ -0,0 +1,397 @@
1/* STMicroelectronics STMPE811 Touchscreen Driver
2 *
3 * (C) 2010 Luotao Fu <l.fu@pengutronix.de>
4 * All rights reserved.
5 *
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License as published by the
8 * Free Software Foundation; either version 2 of the License, or (at your
9 * option) any later version.
10 *
11 */
12
13#include <linux/kernel.h>
14#include <linux/module.h>
15#include <linux/sched.h>
16#include <linux/interrupt.h>
17#include <linux/init.h>
18#include <linux/device.h>
19#include <linux/platform_device.h>
20#include <linux/input.h>
21#include <linux/slab.h>
22#include <linux/delay.h>
23#include <linux/i2c.h>
24#include <linux/workqueue.h>
25
26#include <linux/mfd/stmpe.h>
27
28/* Register layouts and functionalities are identical on all stmpexxx variants
29 * with touchscreen controller
30 */
31#define STMPE_REG_INT_STA 0x0B
32#define STMPE_REG_ADC_CTRL1 0x20
33#define STMPE_REG_ADC_CTRL2 0x21
34#define STMPE_REG_TSC_CTRL 0x40
35#define STMPE_REG_TSC_CFG 0x41
36#define STMPE_REG_FIFO_TH 0x4A
37#define STMPE_REG_FIFO_STA 0x4B
38#define STMPE_REG_FIFO_SIZE 0x4C
39#define STMPE_REG_TSC_DATA_XYZ 0x52
40#define STMPE_REG_TSC_FRACTION_Z 0x56
41#define STMPE_REG_TSC_I_DRIVE 0x58
42
43#define OP_MOD_XYZ 0
44
45#define STMPE_TSC_CTRL_TSC_EN (1<<0)
46
47#define STMPE_FIFO_STA_RESET (1<<0)
48
49#define STMPE_IRQ_TOUCH_DET 0
50
51#define SAMPLE_TIME(x) ((x & 0xf) << 4)
52#define MOD_12B(x) ((x & 0x1) << 3)
53#define REF_SEL(x) ((x & 0x1) << 1)
54#define ADC_FREQ(x) (x & 0x3)
55#define AVE_CTRL(x) ((x & 0x3) << 6)
56#define DET_DELAY(x) ((x & 0x7) << 3)
57#define SETTLING(x) (x & 0x7)
58#define FRACTION_Z(x) (x & 0x7)
59#define I_DRIVE(x) (x & 0x1)
60#define OP_MODE(x) ((x & 0x7) << 1)
61
62#define STMPE_TS_NAME "stmpe-ts"
63#define XY_MASK 0xfff
64
65struct stmpe_touch {
66 struct stmpe *stmpe;
67 struct input_dev *idev;
68 struct delayed_work work;
69 struct device *dev;
70 u8 sample_time;
71 u8 mod_12b;
72 u8 ref_sel;
73 u8 adc_freq;
74 u8 ave_ctrl;
75 u8 touch_det_delay;
76 u8 settling;
77 u8 fraction_z;
78 u8 i_drive;
79};
80
81static int __stmpe_reset_fifo(struct stmpe *stmpe)
82{
83 int ret;
84
85 ret = stmpe_set_bits(stmpe, STMPE_REG_FIFO_STA,
86 STMPE_FIFO_STA_RESET, STMPE_FIFO_STA_RESET);
87 if (ret)
88 return ret;
89
90 return stmpe_set_bits(stmpe, STMPE_REG_FIFO_STA,
91 STMPE_FIFO_STA_RESET, 0);
92}
93
94static void stmpe_work(struct work_struct *work)
95{
96 int int_sta;
97 u32 timeout = 40;
98
99 struct stmpe_touch *ts =
100 container_of(work, struct stmpe_touch, work.work);
101
102 int_sta = stmpe_reg_read(ts->stmpe, STMPE_REG_INT_STA);
103
104 /*
105 * touch_det sometimes get desasserted or just get stuck. This appears
106 * to be a silicon bug, We still have to clearify this with the
107 * manufacture. As a workaround We release the key anyway if the
108 * touch_det keeps coming in after 4ms, while the FIFO contains no value
109 * during the whole time.
110 */
111 while ((int_sta & (1 << STMPE_IRQ_TOUCH_DET)) && (timeout > 0)) {
112 timeout--;
113 int_sta = stmpe_reg_read(ts->stmpe, STMPE_REG_INT_STA);
114 udelay(100);
115 }
116
117 /* reset the FIFO before we report release event */
118 __stmpe_reset_fifo(ts->stmpe);
119
120 input_report_abs(ts->idev, ABS_PRESSURE, 0);
121 input_sync(ts->idev);
122}
123
124static irqreturn_t stmpe_ts_handler(int irq, void *data)
125{
126 u8 data_set[4];
127 int x, y, z;
128 struct stmpe_touch *ts = data;
129
130 /*
131 * Cancel scheduled polling for release if we have new value
132 * available. Wait if the polling is already running.
133 */
134 cancel_delayed_work_sync(&ts->work);
135
136 /*
137 * The FIFO sometimes just crashes and stops generating interrupts. This
138 * appears to be a silicon bug. We still have to clearify this with
139 * the manufacture. As a workaround we disable the TSC while we are
140 * collecting data and flush the FIFO after reading
141 */
142 stmpe_set_bits(ts->stmpe, STMPE_REG_TSC_CTRL,
143 STMPE_TSC_CTRL_TSC_EN, 0);
144
145 stmpe_block_read(ts->stmpe, STMPE_REG_TSC_DATA_XYZ, 4, data_set);
146
147 x = (data_set[0] << 4) | (data_set[1] >> 4);
148 y = ((data_set[1] & 0xf) << 8) | data_set[2];
149 z = data_set[3];
150
151 input_report_abs(ts->idev, ABS_X, x);
152 input_report_abs(ts->idev, ABS_Y, y);
153 input_report_abs(ts->idev, ABS_PRESSURE, z);
154 input_sync(ts->idev);
155
156 /* flush the FIFO after we have read out our values. */
157 __stmpe_reset_fifo(ts->stmpe);
158
159 /* reenable the tsc */
160 stmpe_set_bits(ts->stmpe, STMPE_REG_TSC_CTRL,
161 STMPE_TSC_CTRL_TSC_EN, STMPE_TSC_CTRL_TSC_EN);
162
163 /* start polling for touch_det to detect release */
164 schedule_delayed_work(&ts->work, HZ / 50);
165
166 return IRQ_HANDLED;
167}
168
169static int __devinit stmpe_init_hw(struct stmpe_touch *ts)
170{
171 int ret;
172 u8 adc_ctrl1, adc_ctrl1_mask, tsc_cfg, tsc_cfg_mask;
173 struct stmpe *stmpe = ts->stmpe;
174 struct device *dev = ts->dev;
175
176 ret = stmpe_enable(stmpe, STMPE_BLOCK_TOUCHSCREEN | STMPE_BLOCK_ADC);
177 if (ret) {
178 dev_err(dev, "Could not enable clock for ADC and TS\n");
179 return ret;
180 }
181
182 adc_ctrl1 = SAMPLE_TIME(ts->sample_time) | MOD_12B(ts->mod_12b) |
183 REF_SEL(ts->ref_sel);
184 adc_ctrl1_mask = SAMPLE_TIME(0xff) | MOD_12B(0xff) | REF_SEL(0xff);
185
186 ret = stmpe_set_bits(stmpe, STMPE_REG_ADC_CTRL1,
187 adc_ctrl1_mask, adc_ctrl1);
188 if (ret) {
189 dev_err(dev, "Could not setup ADC\n");
190 return ret;
191 }
192
193 ret = stmpe_set_bits(stmpe, STMPE_REG_ADC_CTRL2,
194 ADC_FREQ(0xff), ADC_FREQ(ts->adc_freq));
195 if (ret) {
196 dev_err(dev, "Could not setup ADC\n");
197 return ret;
198 }
199
200 tsc_cfg = AVE_CTRL(ts->ave_ctrl) | DET_DELAY(ts->touch_det_delay) |
201 SETTLING(ts->settling);
202 tsc_cfg_mask = AVE_CTRL(0xff) | DET_DELAY(0xff) | SETTLING(0xff);
203
204 ret = stmpe_set_bits(stmpe, STMPE_REG_TSC_CFG, tsc_cfg_mask, tsc_cfg);
205 if (ret) {
206 dev_err(dev, "Could not config touch\n");
207 return ret;
208 }
209
210 ret = stmpe_set_bits(stmpe, STMPE_REG_TSC_FRACTION_Z,
211 FRACTION_Z(0xff), FRACTION_Z(ts->fraction_z));
212 if (ret) {
213 dev_err(dev, "Could not config touch\n");
214 return ret;
215 }
216
217 ret = stmpe_set_bits(stmpe, STMPE_REG_TSC_I_DRIVE,
218 I_DRIVE(0xff), I_DRIVE(ts->i_drive));
219 if (ret) {
220 dev_err(dev, "Could not config touch\n");
221 return ret;
222 }
223
224 /* set FIFO to 1 for single point reading */
225 ret = stmpe_reg_write(stmpe, STMPE_REG_FIFO_TH, 1);
226 if (ret) {
227 dev_err(dev, "Could not set FIFO\n");
228 return ret;
229 }
230
231 ret = stmpe_set_bits(stmpe, STMPE_REG_TSC_CTRL,
232 OP_MODE(0xff), OP_MODE(OP_MOD_XYZ));
233 if (ret) {
234 dev_err(dev, "Could not set mode\n");
235 return ret;
236 }
237
238 return 0;
239}
240
241static int stmpe_ts_open(struct input_dev *dev)
242{
243 struct stmpe_touch *ts = input_get_drvdata(dev);
244 int ret = 0;
245
246 ret = __stmpe_reset_fifo(ts->stmpe);
247 if (ret)
248 return ret;
249
250 return stmpe_set_bits(ts->stmpe, STMPE_REG_TSC_CTRL,
251 STMPE_TSC_CTRL_TSC_EN, STMPE_TSC_CTRL_TSC_EN);
252}
253
254static void stmpe_ts_close(struct input_dev *dev)
255{
256 struct stmpe_touch *ts = input_get_drvdata(dev);
257
258 cancel_delayed_work_sync(&ts->work);
259
260 stmpe_set_bits(ts->stmpe, STMPE_REG_TSC_CTRL,
261 STMPE_TSC_CTRL_TSC_EN, 0);
262}
263
264static int __devinit stmpe_input_probe(struct platform_device *pdev)
265{
266 struct stmpe *stmpe = dev_get_drvdata(pdev->dev.parent);
267 struct stmpe_platform_data *pdata = stmpe->pdata;
268 struct stmpe_touch *ts;
269 struct input_dev *idev;
270 struct stmpe_ts_platform_data *ts_pdata = NULL;
271 int ret = 0;
272 unsigned int ts_irq;
273
274 ts_irq = platform_get_irq_byname(pdev, "FIFO_TH");
275 if (ts_irq < 0)
276 return ts_irq;
277
278 ts = kzalloc(sizeof(*ts), GFP_KERNEL);
279 if (!ts)
280 goto err_out;
281
282 idev = input_allocate_device();
283 if (!idev)
284 goto err_free_ts;
285
286 platform_set_drvdata(pdev, ts);
287 ts->stmpe = stmpe;
288 ts->idev = idev;
289 ts->dev = &pdev->dev;
290
291 if (pdata)
292 ts_pdata = pdata->ts;
293
294 if (ts_pdata) {
295 ts->sample_time = ts_pdata->sample_time;
296 ts->mod_12b = ts_pdata->mod_12b;
297 ts->ref_sel = ts_pdata->ref_sel;
298 ts->adc_freq = ts_pdata->adc_freq;
299 ts->ave_ctrl = ts_pdata->ave_ctrl;
300 ts->touch_det_delay = ts_pdata->touch_det_delay;
301 ts->settling = ts_pdata->settling;
302 ts->fraction_z = ts_pdata->fraction_z;
303 ts->i_drive = ts_pdata->i_drive;
304 }
305
306 INIT_DELAYED_WORK(&ts->work, stmpe_work);
307
308 ret = request_threaded_irq(ts_irq, NULL, stmpe_ts_handler,
309 IRQF_ONESHOT, STMPE_TS_NAME, ts);
310 if (ret) {
311 dev_err(&pdev->dev, "Failed to request IRQ %d\n", ts_irq);
312 goto err_free_input;
313 }
314
315 ret = stmpe_init_hw(ts);
316 if (ret)
317 goto err_free_irq;
318
319 idev->name = STMPE_TS_NAME;
320 idev->id.bustype = BUS_I2C;
321 idev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
322 idev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
323
324 idev->open = stmpe_ts_open;
325 idev->close = stmpe_ts_close;
326
327 input_set_drvdata(idev, ts);
328
329 input_set_abs_params(idev, ABS_X, 0, XY_MASK, 0, 0);
330 input_set_abs_params(idev, ABS_Y, 0, XY_MASK, 0, 0);
331 input_set_abs_params(idev, ABS_PRESSURE, 0x0, 0xff, 0, 0);
332
333 ret = input_register_device(idev);
334 if (ret) {
335 dev_err(&pdev->dev, "Could not register input device\n");
336 goto err_free_irq;
337 }
338
339 return ret;
340
341err_free_irq:
342 free_irq(ts_irq, ts);
343err_free_input:
344 input_free_device(idev);
345 platform_set_drvdata(pdev, NULL);
346err_free_ts:
347 kfree(ts);
348err_out:
349 return ret;
350}
351
352static int __devexit stmpe_ts_remove(struct platform_device *pdev)
353{
354 struct stmpe_touch *ts = platform_get_drvdata(pdev);
355 unsigned int ts_irq = platform_get_irq_byname(pdev, "FIFO_TH");
356
357 stmpe_disable(ts->stmpe, STMPE_BLOCK_TOUCHSCREEN);
358
359 free_irq(ts_irq, ts);
360
361 platform_set_drvdata(pdev, NULL);
362
363 input_unregister_device(ts->idev);
364 input_free_device(ts->idev);
365
366 kfree(ts);
367
368 return 0;
369}
370
371static struct platform_driver stmpe_ts_driver = {
372 .driver = {
373 .name = STMPE_TS_NAME,
374 .owner = THIS_MODULE,
375 },
376 .probe = stmpe_input_probe,
377 .remove = __devexit_p(stmpe_ts_remove),
378};
379
380static int __init stmpe_ts_init(void)
381{
382 return platform_driver_register(&stmpe_ts_driver);
383}
384
385module_init(stmpe_ts_init);
386
387static void __exit stmpe_ts_exit(void)
388{
389 platform_driver_unregister(&stmpe_ts_driver);
390}
391
392module_exit(stmpe_ts_exit);
393
394MODULE_AUTHOR("Luotao Fu <l.fu@pengutronix.de>");
395MODULE_DESCRIPTION("STMPEXXX touchscreen driver");
396MODULE_LICENSE("GPL");
397MODULE_ALIAS("platform:" STMPE_TS_NAME);