PM / sleep: Asynchronous threads for suspend_noirq
[linux/fpc-iii.git] / drivers / input / touchscreen / stmpe-ts.c
blob42ce31afa259e80d674b4cf2071e4c7cff5f4be0
1 /*
2 * STMicroelectronics STMPE811 Touchscreen Driver
4 * (C) 2010 Luotao Fu <l.fu@pengutronix.de>
5 * All rights reserved.
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.
14 #include <linux/kernel.h>
15 #include <linux/module.h>
16 #include <linux/sched.h>
17 #include <linux/interrupt.h>
18 #include <linux/device.h>
19 #include <linux/of.h>
20 #include <linux/platform_device.h>
21 #include <linux/input.h>
22 #include <linux/slab.h>
23 #include <linux/delay.h>
24 #include <linux/i2c.h>
25 #include <linux/workqueue.h>
27 #include <linux/mfd/stmpe.h>
29 /* Register layouts and functionalities are identical on all stmpexxx variants
30 * with touchscreen controller
32 #define STMPE_REG_INT_STA 0x0B
33 #define STMPE_REG_ADC_CTRL1 0x20
34 #define STMPE_REG_ADC_CTRL2 0x21
35 #define STMPE_REG_TSC_CTRL 0x40
36 #define STMPE_REG_TSC_CFG 0x41
37 #define STMPE_REG_FIFO_TH 0x4A
38 #define STMPE_REG_FIFO_STA 0x4B
39 #define STMPE_REG_FIFO_SIZE 0x4C
40 #define STMPE_REG_TSC_DATA_XYZ 0x52
41 #define STMPE_REG_TSC_FRACTION_Z 0x56
42 #define STMPE_REG_TSC_I_DRIVE 0x58
44 #define OP_MOD_XYZ 0
46 #define STMPE_TSC_CTRL_TSC_EN (1<<0)
48 #define STMPE_FIFO_STA_RESET (1<<0)
50 #define STMPE_IRQ_TOUCH_DET 0
52 #define SAMPLE_TIME(x) ((x & 0xf) << 4)
53 #define MOD_12B(x) ((x & 0x1) << 3)
54 #define REF_SEL(x) ((x & 0x1) << 1)
55 #define ADC_FREQ(x) (x & 0x3)
56 #define AVE_CTRL(x) ((x & 0x3) << 6)
57 #define DET_DELAY(x) ((x & 0x7) << 3)
58 #define SETTLING(x) (x & 0x7)
59 #define FRACTION_Z(x) (x & 0x7)
60 #define I_DRIVE(x) (x & 0x1)
61 #define OP_MODE(x) ((x & 0x7) << 1)
63 #define STMPE_TS_NAME "stmpe-ts"
64 #define XY_MASK 0xfff
66 struct stmpe_touch {
67 struct stmpe *stmpe;
68 struct input_dev *idev;
69 struct delayed_work work;
70 struct device *dev;
71 u8 sample_time;
72 u8 mod_12b;
73 u8 ref_sel;
74 u8 adc_freq;
75 u8 ave_ctrl;
76 u8 touch_det_delay;
77 u8 settling;
78 u8 fraction_z;
79 u8 i_drive;
82 static int __stmpe_reset_fifo(struct stmpe *stmpe)
84 int ret;
86 ret = stmpe_set_bits(stmpe, STMPE_REG_FIFO_STA,
87 STMPE_FIFO_STA_RESET, STMPE_FIFO_STA_RESET);
88 if (ret)
89 return ret;
91 return stmpe_set_bits(stmpe, STMPE_REG_FIFO_STA,
92 STMPE_FIFO_STA_RESET, 0);
95 static void stmpe_work(struct work_struct *work)
97 int int_sta;
98 u32 timeout = 40;
100 struct stmpe_touch *ts =
101 container_of(work, struct stmpe_touch, work.work);
103 int_sta = stmpe_reg_read(ts->stmpe, STMPE_REG_INT_STA);
106 * touch_det sometimes get desasserted or just get stuck. This appears
107 * to be a silicon bug, We still have to clearify this with the
108 * manufacture. As a workaround We release the key anyway if the
109 * touch_det keeps coming in after 4ms, while the FIFO contains no value
110 * during the whole time.
112 while ((int_sta & (1 << STMPE_IRQ_TOUCH_DET)) && (timeout > 0)) {
113 timeout--;
114 int_sta = stmpe_reg_read(ts->stmpe, STMPE_REG_INT_STA);
115 udelay(100);
118 /* reset the FIFO before we report release event */
119 __stmpe_reset_fifo(ts->stmpe);
121 input_report_abs(ts->idev, ABS_PRESSURE, 0);
122 input_report_key(ts->idev, BTN_TOUCH, 0);
123 input_sync(ts->idev);
126 static irqreturn_t stmpe_ts_handler(int irq, void *data)
128 u8 data_set[4];
129 int x, y, z;
130 struct stmpe_touch *ts = data;
133 * Cancel scheduled polling for release if we have new value
134 * available. Wait if the polling is already running.
136 cancel_delayed_work_sync(&ts->work);
139 * The FIFO sometimes just crashes and stops generating interrupts. This
140 * appears to be a silicon bug. We still have to clearify this with
141 * the manufacture. As a workaround we disable the TSC while we are
142 * collecting data and flush the FIFO after reading
144 stmpe_set_bits(ts->stmpe, STMPE_REG_TSC_CTRL,
145 STMPE_TSC_CTRL_TSC_EN, 0);
147 stmpe_block_read(ts->stmpe, STMPE_REG_TSC_DATA_XYZ, 4, data_set);
149 x = (data_set[0] << 4) | (data_set[1] >> 4);
150 y = ((data_set[1] & 0xf) << 8) | data_set[2];
151 z = data_set[3];
153 input_report_abs(ts->idev, ABS_X, x);
154 input_report_abs(ts->idev, ABS_Y, y);
155 input_report_abs(ts->idev, ABS_PRESSURE, z);
156 input_report_key(ts->idev, BTN_TOUCH, 1);
157 input_sync(ts->idev);
159 /* flush the FIFO after we have read out our values. */
160 __stmpe_reset_fifo(ts->stmpe);
162 /* reenable the tsc */
163 stmpe_set_bits(ts->stmpe, STMPE_REG_TSC_CTRL,
164 STMPE_TSC_CTRL_TSC_EN, STMPE_TSC_CTRL_TSC_EN);
166 /* start polling for touch_det to detect release */
167 schedule_delayed_work(&ts->work, HZ / 50);
169 return IRQ_HANDLED;
172 static int stmpe_init_hw(struct stmpe_touch *ts)
174 int ret;
175 u8 adc_ctrl1, adc_ctrl1_mask, tsc_cfg, tsc_cfg_mask;
176 struct stmpe *stmpe = ts->stmpe;
177 struct device *dev = ts->dev;
179 ret = stmpe_enable(stmpe, STMPE_BLOCK_TOUCHSCREEN | STMPE_BLOCK_ADC);
180 if (ret) {
181 dev_err(dev, "Could not enable clock for ADC and TS\n");
182 return ret;
185 adc_ctrl1 = SAMPLE_TIME(ts->sample_time) | MOD_12B(ts->mod_12b) |
186 REF_SEL(ts->ref_sel);
187 adc_ctrl1_mask = SAMPLE_TIME(0xff) | MOD_12B(0xff) | REF_SEL(0xff);
189 ret = stmpe_set_bits(stmpe, STMPE_REG_ADC_CTRL1,
190 adc_ctrl1_mask, adc_ctrl1);
191 if (ret) {
192 dev_err(dev, "Could not setup ADC\n");
193 return ret;
196 ret = stmpe_set_bits(stmpe, STMPE_REG_ADC_CTRL2,
197 ADC_FREQ(0xff), ADC_FREQ(ts->adc_freq));
198 if (ret) {
199 dev_err(dev, "Could not setup ADC\n");
200 return ret;
203 tsc_cfg = AVE_CTRL(ts->ave_ctrl) | DET_DELAY(ts->touch_det_delay) |
204 SETTLING(ts->settling);
205 tsc_cfg_mask = AVE_CTRL(0xff) | DET_DELAY(0xff) | SETTLING(0xff);
207 ret = stmpe_set_bits(stmpe, STMPE_REG_TSC_CFG, tsc_cfg_mask, tsc_cfg);
208 if (ret) {
209 dev_err(dev, "Could not config touch\n");
210 return ret;
213 ret = stmpe_set_bits(stmpe, STMPE_REG_TSC_FRACTION_Z,
214 FRACTION_Z(0xff), FRACTION_Z(ts->fraction_z));
215 if (ret) {
216 dev_err(dev, "Could not config touch\n");
217 return ret;
220 ret = stmpe_set_bits(stmpe, STMPE_REG_TSC_I_DRIVE,
221 I_DRIVE(0xff), I_DRIVE(ts->i_drive));
222 if (ret) {
223 dev_err(dev, "Could not config touch\n");
224 return ret;
227 /* set FIFO to 1 for single point reading */
228 ret = stmpe_reg_write(stmpe, STMPE_REG_FIFO_TH, 1);
229 if (ret) {
230 dev_err(dev, "Could not set FIFO\n");
231 return ret;
234 ret = stmpe_set_bits(stmpe, STMPE_REG_TSC_CTRL,
235 OP_MODE(0xff), OP_MODE(OP_MOD_XYZ));
236 if (ret) {
237 dev_err(dev, "Could not set mode\n");
238 return ret;
241 return 0;
244 static int stmpe_ts_open(struct input_dev *dev)
246 struct stmpe_touch *ts = input_get_drvdata(dev);
247 int ret = 0;
249 ret = __stmpe_reset_fifo(ts->stmpe);
250 if (ret)
251 return ret;
253 return stmpe_set_bits(ts->stmpe, STMPE_REG_TSC_CTRL,
254 STMPE_TSC_CTRL_TSC_EN, STMPE_TSC_CTRL_TSC_EN);
257 static void stmpe_ts_close(struct input_dev *dev)
259 struct stmpe_touch *ts = input_get_drvdata(dev);
261 cancel_delayed_work_sync(&ts->work);
263 stmpe_set_bits(ts->stmpe, STMPE_REG_TSC_CTRL,
264 STMPE_TSC_CTRL_TSC_EN, 0);
267 static void stmpe_ts_get_platform_info(struct platform_device *pdev,
268 struct stmpe_touch *ts)
270 struct stmpe *stmpe = dev_get_drvdata(pdev->dev.parent);
271 struct device_node *np = pdev->dev.of_node;
272 struct stmpe_ts_platform_data *ts_pdata = NULL;
274 ts->stmpe = stmpe;
276 if (stmpe->pdata && stmpe->pdata->ts) {
277 ts_pdata = stmpe->pdata->ts;
279 ts->sample_time = ts_pdata->sample_time;
280 ts->mod_12b = ts_pdata->mod_12b;
281 ts->ref_sel = ts_pdata->ref_sel;
282 ts->adc_freq = ts_pdata->adc_freq;
283 ts->ave_ctrl = ts_pdata->ave_ctrl;
284 ts->touch_det_delay = ts_pdata->touch_det_delay;
285 ts->settling = ts_pdata->settling;
286 ts->fraction_z = ts_pdata->fraction_z;
287 ts->i_drive = ts_pdata->i_drive;
288 } else if (np) {
289 u32 val;
291 if (!of_property_read_u32(np, "st,sample-time", &val))
292 ts->sample_time = val;
293 if (!of_property_read_u32(np, "st,mod-12b", &val))
294 ts->mod_12b = val;
295 if (!of_property_read_u32(np, "st,ref-sel", &val))
296 ts->ref_sel = val;
297 if (!of_property_read_u32(np, "st,adc-freq", &val))
298 ts->adc_freq = val;
299 if (!of_property_read_u32(np, "st,ave-ctrl", &val))
300 ts->ave_ctrl = val;
301 if (!of_property_read_u32(np, "st,touch-det-delay", &val))
302 ts->touch_det_delay = val;
303 if (!of_property_read_u32(np, "st,settling", &val))
304 ts->settling = val;
305 if (!of_property_read_u32(np, "st,fraction-z", &val))
306 ts->fraction_z = val;
307 if (!of_property_read_u32(np, "st,i-drive", &val))
308 ts->i_drive = val;
312 static int stmpe_input_probe(struct platform_device *pdev)
314 struct stmpe_touch *ts;
315 struct input_dev *idev;
316 int error;
317 int ts_irq;
319 ts_irq = platform_get_irq_byname(pdev, "FIFO_TH");
320 if (ts_irq < 0)
321 return ts_irq;
323 ts = devm_kzalloc(&pdev->dev, sizeof(*ts), GFP_KERNEL);
324 if (!ts)
325 return -ENOMEM;
327 idev = devm_input_allocate_device(&pdev->dev);
328 if (!idev)
329 return -ENOMEM;
331 platform_set_drvdata(pdev, ts);
332 ts->idev = idev;
333 ts->dev = &pdev->dev;
335 stmpe_ts_get_platform_info(pdev, ts);
337 INIT_DELAYED_WORK(&ts->work, stmpe_work);
339 error = devm_request_threaded_irq(&pdev->dev, ts_irq,
340 NULL, stmpe_ts_handler,
341 IRQF_ONESHOT, STMPE_TS_NAME, ts);
342 if (error) {
343 dev_err(&pdev->dev, "Failed to request IRQ %d\n", ts_irq);
344 return error;
347 error = stmpe_init_hw(ts);
348 if (error)
349 return error;
351 idev->name = STMPE_TS_NAME;
352 idev->phys = STMPE_TS_NAME"/input0";
353 idev->id.bustype = BUS_I2C;
354 idev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
355 idev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
357 idev->open = stmpe_ts_open;
358 idev->close = stmpe_ts_close;
360 input_set_drvdata(idev, ts);
362 input_set_abs_params(idev, ABS_X, 0, XY_MASK, 0, 0);
363 input_set_abs_params(idev, ABS_Y, 0, XY_MASK, 0, 0);
364 input_set_abs_params(idev, ABS_PRESSURE, 0x0, 0xff, 0, 0);
366 error = input_register_device(idev);
367 if (error) {
368 dev_err(&pdev->dev, "Could not register input device\n");
369 return error;
372 return 0;
375 static int stmpe_ts_remove(struct platform_device *pdev)
377 struct stmpe_touch *ts = platform_get_drvdata(pdev);
379 stmpe_disable(ts->stmpe, STMPE_BLOCK_TOUCHSCREEN);
381 return 0;
384 static struct platform_driver stmpe_ts_driver = {
385 .driver = {
386 .name = STMPE_TS_NAME,
387 .owner = THIS_MODULE,
389 .probe = stmpe_input_probe,
390 .remove = stmpe_ts_remove,
392 module_platform_driver(stmpe_ts_driver);
394 MODULE_AUTHOR("Luotao Fu <l.fu@pengutronix.de>");
395 MODULE_DESCRIPTION("STMPEXXX touchscreen driver");
396 MODULE_LICENSE("GPL");
397 MODULE_ALIAS("platform:" STMPE_TS_NAME);