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14#include <linux/module.h>
15#include <linux/kernel.h>
16#include <linux/delay.h>
17#include <linux/platform_device.h>
18#include <linux/input.h>
19#include <linux/workqueue.h>
20#include <linux/mfd/da903x.h>
21#include <linux/slab.h>
22
23#define DA9034_MANUAL_CTRL 0x50
24#define DA9034_LDO_ADC_EN (1 << 4)
25
26#define DA9034_AUTO_CTRL1 0x51
27
28#define DA9034_AUTO_CTRL2 0x52
29#define DA9034_AUTO_TSI_EN (1 << 3)
30#define DA9034_PEN_DETECT (1 << 4)
31
32#define DA9034_TSI_CTRL1 0x53
33#define DA9034_TSI_CTRL2 0x54
34#define DA9034_TSI_X_MSB 0x6c
35#define DA9034_TSI_Y_MSB 0x6d
36#define DA9034_TSI_XY_LSB 0x6e
37
38enum {
39 STATE_IDLE,
40 STATE_BUSY,
41 STATE_STOP,
42 STATE_WAIT,
43};
44
45enum {
46 EVENT_PEN_DOWN,
47 EVENT_PEN_UP,
48 EVENT_TSI_READY,
49 EVENT_TIMEDOUT,
50};
51
52struct da9034_touch {
53 struct device *da9034_dev;
54 struct input_dev *input_dev;
55
56 struct delayed_work tsi_work;
57 struct notifier_block notifier;
58
59 int state;
60
61 int interval_ms;
62 int x_inverted;
63 int y_inverted;
64
65 int last_x;
66 int last_y;
67};
68
69static inline int is_pen_down(struct da9034_touch *touch)
70{
71 return da903x_query_status(touch->da9034_dev, DA9034_STATUS_PEN_DOWN);
72}
73
74static inline int detect_pen_down(struct da9034_touch *touch, int on)
75{
76 if (on)
77 return da903x_set_bits(touch->da9034_dev,
78 DA9034_AUTO_CTRL2, DA9034_PEN_DETECT);
79 else
80 return da903x_clr_bits(touch->da9034_dev,
81 DA9034_AUTO_CTRL2, DA9034_PEN_DETECT);
82}
83
84static int read_tsi(struct da9034_touch *touch)
85{
86 uint8_t _x, _y, _v;
87 int ret;
88
89 ret = da903x_read(touch->da9034_dev, DA9034_TSI_X_MSB, &_x);
90 if (ret)
91 return ret;
92
93 ret = da903x_read(touch->da9034_dev, DA9034_TSI_Y_MSB, &_y);
94 if (ret)
95 return ret;
96
97 ret = da903x_read(touch->da9034_dev, DA9034_TSI_XY_LSB, &_v);
98 if (ret)
99 return ret;
100
101 touch->last_x = ((_x << 2) & 0x3fc) | (_v & 0x3);
102 touch->last_y = ((_y << 2) & 0x3fc) | ((_v & 0xc) >> 2);
103
104 return 0;
105}
106
107static inline int start_tsi(struct da9034_touch *touch)
108{
109 return da903x_set_bits(touch->da9034_dev,
110 DA9034_AUTO_CTRL2, DA9034_AUTO_TSI_EN);
111}
112
113static inline int stop_tsi(struct da9034_touch *touch)
114{
115 return da903x_clr_bits(touch->da9034_dev,
116 DA9034_AUTO_CTRL2, DA9034_AUTO_TSI_EN);
117}
118
119static inline void report_pen_down(struct da9034_touch *touch)
120{
121 int x = touch->last_x;
122 int y = touch->last_y;
123
124 x &= 0xfff;
125 if (touch->x_inverted)
126 x = 1024 - x;
127 y &= 0xfff;
128 if (touch->y_inverted)
129 y = 1024 - y;
130
131 input_report_abs(touch->input_dev, ABS_X, x);
132 input_report_abs(touch->input_dev, ABS_Y, y);
133 input_report_key(touch->input_dev, BTN_TOUCH, 1);
134
135 input_sync(touch->input_dev);
136}
137
138static inline void report_pen_up(struct da9034_touch *touch)
139{
140 input_report_key(touch->input_dev, BTN_TOUCH, 0);
141 input_sync(touch->input_dev);
142}
143
144static void da9034_event_handler(struct da9034_touch *touch, int event)
145{
146 int err;
147
148 switch (touch->state) {
149 case STATE_IDLE:
150 if (event != EVENT_PEN_DOWN)
151 break;
152
153
154
155
156 err = start_tsi(touch);
157 if (err)
158 goto err_reset;
159
160 touch->state = STATE_BUSY;
161 break;
162
163 case STATE_BUSY:
164 if (event != EVENT_TSI_READY)
165 break;
166
167 err = read_tsi(touch);
168 if (err)
169 goto err_reset;
170
171
172
173
174 err = stop_tsi(touch);
175 if (err)
176 goto err_reset;
177
178 touch->state = STATE_STOP;
179
180
181
182
183
184
185 mdelay(1);
186 da9034_event_handler(touch,
187 is_pen_down(touch) ? EVENT_PEN_DOWN :
188 EVENT_PEN_UP);
189 break;
190
191 case STATE_STOP:
192 if (event == EVENT_PEN_DOWN) {
193 report_pen_down(touch);
194 schedule_delayed_work(&touch->tsi_work,
195 msecs_to_jiffies(touch->interval_ms));
196 touch->state = STATE_WAIT;
197 }
198
199 if (event == EVENT_PEN_UP) {
200 report_pen_up(touch);
201 touch->state = STATE_IDLE;
202 }
203 break;
204
205 case STATE_WAIT:
206 if (event != EVENT_TIMEDOUT)
207 break;
208
209 if (is_pen_down(touch)) {
210 start_tsi(touch);
211 touch->state = STATE_BUSY;
212 } else {
213 report_pen_up(touch);
214 touch->state = STATE_IDLE;
215 }
216 break;
217 }
218 return;
219
220err_reset:
221 touch->state = STATE_IDLE;
222 stop_tsi(touch);
223 detect_pen_down(touch, 1);
224}
225
226static void da9034_tsi_work(struct work_struct *work)
227{
228 struct da9034_touch *touch =
229 container_of(work, struct da9034_touch, tsi_work.work);
230
231 da9034_event_handler(touch, EVENT_TIMEDOUT);
232}
233
234static int da9034_touch_notifier(struct notifier_block *nb,
235 unsigned long event, void *data)
236{
237 struct da9034_touch *touch =
238 container_of(nb, struct da9034_touch, notifier);
239
240 if (event & DA9034_EVENT_TSI_READY)
241 da9034_event_handler(touch, EVENT_TSI_READY);
242
243 if ((event & DA9034_EVENT_PEN_DOWN) && touch->state == STATE_IDLE)
244 da9034_event_handler(touch, EVENT_PEN_DOWN);
245
246 return 0;
247}
248
249static int da9034_touch_open(struct input_dev *dev)
250{
251 struct da9034_touch *touch = input_get_drvdata(dev);
252 int ret;
253
254 ret = da903x_register_notifier(touch->da9034_dev, &touch->notifier,
255 DA9034_EVENT_PEN_DOWN | DA9034_EVENT_TSI_READY);
256 if (ret)
257 return -EBUSY;
258
259
260 ret = da903x_set_bits(touch->da9034_dev,
261 DA9034_MANUAL_CTRL, DA9034_LDO_ADC_EN);
262 if (ret)
263 return ret;
264
265
266 ret = da903x_write(touch->da9034_dev, DA9034_TSI_CTRL1, 0x1b);
267 if (ret)
268 return ret;
269
270 ret = da903x_write(touch->da9034_dev, DA9034_TSI_CTRL2, 0x00);
271 if (ret)
272 return ret;
273
274 touch->state = STATE_IDLE;
275 detect_pen_down(touch, 1);
276
277 return 0;
278}
279
280static void da9034_touch_close(struct input_dev *dev)
281{
282 struct da9034_touch *touch = input_get_drvdata(dev);
283
284 da903x_unregister_notifier(touch->da9034_dev, &touch->notifier,
285 DA9034_EVENT_PEN_DOWN | DA9034_EVENT_TSI_READY);
286
287 cancel_delayed_work_sync(&touch->tsi_work);
288
289 touch->state = STATE_IDLE;
290 stop_tsi(touch);
291 detect_pen_down(touch, 0);
292
293
294 da903x_clr_bits(touch->da9034_dev,
295 DA9034_MANUAL_CTRL, DA9034_LDO_ADC_EN);
296}
297
298
299static int da9034_touch_probe(struct platform_device *pdev)
300{
301 struct da9034_touch_pdata *pdata = dev_get_platdata(&pdev->dev);
302 struct da9034_touch *touch;
303 struct input_dev *input_dev;
304 int error;
305
306 touch = devm_kzalloc(&pdev->dev, sizeof(struct da9034_touch),
307 GFP_KERNEL);
308 if (!touch) {
309 dev_err(&pdev->dev, "failed to allocate driver data\n");
310 return -ENOMEM;
311 }
312
313 touch->da9034_dev = pdev->dev.parent;
314
315 if (pdata) {
316 touch->interval_ms = pdata->interval_ms;
317 touch->x_inverted = pdata->x_inverted;
318 touch->y_inverted = pdata->y_inverted;
319 } else {
320
321 touch->interval_ms = 10;
322 }
323
324 INIT_DELAYED_WORK(&touch->tsi_work, da9034_tsi_work);
325 touch->notifier.notifier_call = da9034_touch_notifier;
326
327 input_dev = devm_input_allocate_device(&pdev->dev);
328 if (!input_dev) {
329 dev_err(&pdev->dev, "failed to allocate input device\n");
330 return -ENOMEM;
331 }
332
333 input_dev->name = pdev->name;
334 input_dev->open = da9034_touch_open;
335 input_dev->close = da9034_touch_close;
336 input_dev->dev.parent = &pdev->dev;
337
338 __set_bit(EV_ABS, input_dev->evbit);
339 __set_bit(ABS_X, input_dev->absbit);
340 __set_bit(ABS_Y, input_dev->absbit);
341 input_set_abs_params(input_dev, ABS_X, 0, 1023, 0, 0);
342 input_set_abs_params(input_dev, ABS_Y, 0, 1023, 0, 0);
343
344 __set_bit(EV_KEY, input_dev->evbit);
345 __set_bit(BTN_TOUCH, input_dev->keybit);
346
347 touch->input_dev = input_dev;
348 input_set_drvdata(input_dev, touch);
349
350 error = input_register_device(input_dev);
351 if (error)
352 return error;
353
354 return 0;
355}
356
357static struct platform_driver da9034_touch_driver = {
358 .driver = {
359 .name = "da9034-touch",
360 },
361 .probe = da9034_touch_probe,
362};
363module_platform_driver(da9034_touch_driver);
364
365MODULE_DESCRIPTION("Touchscreen driver for Dialog Semiconductor DA9034");
366MODULE_AUTHOR("Eric Miao <eric.miao@marvell.com>, Bin Yang <bin.yang@marvell.com>");
367MODULE_LICENSE("GPL");
368MODULE_ALIAS("platform:da9034-touch");
369
