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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>
26
27#include <linux/mfd/stmpe.h>
28
29
30
31
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
43
44#define OP_MOD_XYZ 0
45
46#define STMPE_TSC_CTRL_TSC_EN (1<<0)
47
48#define STMPE_FIFO_STA_RESET (1<<0)
49
50#define STMPE_IRQ_TOUCH_DET 0
51
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)
62
63#define STMPE_TS_NAME "stmpe-ts"
64#define XY_MASK 0xfff
65
66struct 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;
80};
81
82static int __stmpe_reset_fifo(struct stmpe *stmpe)
83{
84 int ret;
85
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;
90
91 return stmpe_set_bits(stmpe, STMPE_REG_FIFO_STA,
92 STMPE_FIFO_STA_RESET, 0);
93}
94
95static void stmpe_work(struct work_struct *work)
96{
97 int int_sta;
98 u32 timeout = 40;
99
100 struct stmpe_touch *ts =
101 container_of(work, struct stmpe_touch, work.work);
102
103 int_sta = stmpe_reg_read(ts->stmpe, STMPE_REG_INT_STA);
104
105
106
107
108
109
110
111
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);
116 }
117
118
119 __stmpe_reset_fifo(ts->stmpe);
120
121 input_report_abs(ts->idev, ABS_PRESSURE, 0);
122 input_report_key(ts->idev, BTN_TOUCH, 0);
123 input_sync(ts->idev);
124}
125
126static irqreturn_t stmpe_ts_handler(int irq, void *data)
127{
128 u8 data_set[4];
129 int x, y, z;
130 struct stmpe_touch *ts = data;
131
132
133
134
135
136 cancel_delayed_work_sync(&ts->work);
137
138
139
140
141
142
143
144 stmpe_set_bits(ts->stmpe, STMPE_REG_TSC_CTRL,
145 STMPE_TSC_CTRL_TSC_EN, 0);
146
147 stmpe_block_read(ts->stmpe, STMPE_REG_TSC_DATA_XYZ, 4, data_set);
148
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];
152
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);
158
159
160 __stmpe_reset_fifo(ts->stmpe);
161
162
163 stmpe_set_bits(ts->stmpe, STMPE_REG_TSC_CTRL,
164 STMPE_TSC_CTRL_TSC_EN, STMPE_TSC_CTRL_TSC_EN);
165
166
167 schedule_delayed_work(&ts->work, msecs_to_jiffies(50));
168
169 return IRQ_HANDLED;
170}
171
172static int stmpe_init_hw(struct stmpe_touch *ts)
173{
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;
178
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;
183 }
184
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);
188
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;
194 }
195
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;
201 }
202
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);
206
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;
211 }
212
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;
218 }
219
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;
225 }
226
227
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;
232 }
233
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;
239 }
240
241 return 0;
242}
243
244static int stmpe_ts_open(struct input_dev *dev)
245{
246 struct stmpe_touch *ts = input_get_drvdata(dev);
247 int ret = 0;
248
249 ret = __stmpe_reset_fifo(ts->stmpe);
250 if (ret)
251 return ret;
252
253 return stmpe_set_bits(ts->stmpe, STMPE_REG_TSC_CTRL,
254 STMPE_TSC_CTRL_TSC_EN, STMPE_TSC_CTRL_TSC_EN);
255}
256
257static void stmpe_ts_close(struct input_dev *dev)
258{
259 struct stmpe_touch *ts = input_get_drvdata(dev);
260
261 cancel_delayed_work_sync(&ts->work);
262
263 stmpe_set_bits(ts->stmpe, STMPE_REG_TSC_CTRL,
264 STMPE_TSC_CTRL_TSC_EN, 0);
265}
266
267static void stmpe_ts_get_platform_info(struct platform_device *pdev,
268 struct stmpe_touch *ts)
269{
270 struct device_node *np = pdev->dev.of_node;
271 u32 val;
272
273 if (np) {
274 if (!of_property_read_u32(np, "st,sample-time", &val))
275 ts->sample_time = val;
276 if (!of_property_read_u32(np, "st,mod-12b", &val))
277 ts->mod_12b = val;
278 if (!of_property_read_u32(np, "st,ref-sel", &val))
279 ts->ref_sel = val;
280 if (!of_property_read_u32(np, "st,adc-freq", &val))
281 ts->adc_freq = val;
282 if (!of_property_read_u32(np, "st,ave-ctrl", &val))
283 ts->ave_ctrl = val;
284 if (!of_property_read_u32(np, "st,touch-det-delay", &val))
285 ts->touch_det_delay = val;
286 if (!of_property_read_u32(np, "st,settling", &val))
287 ts->settling = val;
288 if (!of_property_read_u32(np, "st,fraction-z", &val))
289 ts->fraction_z = val;
290 if (!of_property_read_u32(np, "st,i-drive", &val))
291 ts->i_drive = val;
292 }
293}
294
295static int stmpe_input_probe(struct platform_device *pdev)
296{
297 struct stmpe *stmpe = dev_get_drvdata(pdev->dev.parent);
298 struct stmpe_touch *ts;
299 struct input_dev *idev;
300 int error;
301 int ts_irq;
302
303 ts_irq = platform_get_irq_byname(pdev, "FIFO_TH");
304 if (ts_irq < 0)
305 return ts_irq;
306
307 ts = devm_kzalloc(&pdev->dev, sizeof(*ts), GFP_KERNEL);
308 if (!ts)
309 return -ENOMEM;
310
311 idev = devm_input_allocate_device(&pdev->dev);
312 if (!idev)
313 return -ENOMEM;
314
315 platform_set_drvdata(pdev, ts);
316 ts->stmpe = stmpe;
317 ts->idev = idev;
318 ts->dev = &pdev->dev;
319
320 stmpe_ts_get_platform_info(pdev, ts);
321
322 INIT_DELAYED_WORK(&ts->work, stmpe_work);
323
324 error = devm_request_threaded_irq(&pdev->dev, ts_irq,
325 NULL, stmpe_ts_handler,
326 IRQF_ONESHOT, STMPE_TS_NAME, ts);
327 if (error) {
328 dev_err(&pdev->dev, "Failed to request IRQ %d\n", ts_irq);
329 return error;
330 }
331
332 error = stmpe_init_hw(ts);
333 if (error)
334 return error;
335
336 idev->name = STMPE_TS_NAME;
337 idev->phys = STMPE_TS_NAME"/input0";
338 idev->id.bustype = BUS_I2C;
339
340 idev->open = stmpe_ts_open;
341 idev->close = stmpe_ts_close;
342
343 input_set_drvdata(idev, ts);
344
345 input_set_capability(idev, EV_KEY, BTN_TOUCH);
346 input_set_abs_params(idev, ABS_X, 0, XY_MASK, 0, 0);
347 input_set_abs_params(idev, ABS_Y, 0, XY_MASK, 0, 0);
348 input_set_abs_params(idev, ABS_PRESSURE, 0x0, 0xff, 0, 0);
349
350 error = input_register_device(idev);
351 if (error) {
352 dev_err(&pdev->dev, "Could not register input device\n");
353 return error;
354 }
355
356 return 0;
357}
358
359static int stmpe_ts_remove(struct platform_device *pdev)
360{
361 struct stmpe_touch *ts = platform_get_drvdata(pdev);
362
363 stmpe_disable(ts->stmpe, STMPE_BLOCK_TOUCHSCREEN);
364
365 return 0;
366}
367
368static struct platform_driver stmpe_ts_driver = {
369 .driver = {
370 .name = STMPE_TS_NAME,
371 },
372 .probe = stmpe_input_probe,
373 .remove = stmpe_ts_remove,
374};
375module_platform_driver(stmpe_ts_driver);
376
377static const struct of_device_id stmpe_ts_ids[] = {
378 { .compatible = "st,stmpe-ts", },
379 { },
380};
381MODULE_DEVICE_TABLE(of, stmpe_ts_ids);
382
383MODULE_AUTHOR("Luotao Fu <l.fu@pengutronix.de>");
384MODULE_DESCRIPTION("STMPEXXX touchscreen driver");
385MODULE_LICENSE("GPL");
386
