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14#include <linux/module.h>
15#include <linux/input.h>
16#include <linux/delay.h>
17#include <linux/platform_device.h>
18#include <linux/interrupt.h>
19
20#include <linux/mfd/da9052/reg.h>
21#include <linux/mfd/da9052/da9052.h>
22
23#define TSI_PEN_DOWN_STATUS 0x40
24
25struct da9052_tsi {
26 struct da9052 *da9052;
27 struct input_dev *dev;
28 struct delayed_work ts_pen_work;
29 struct mutex mutex;
30 bool stopped;
31 bool adc_on;
32};
33
34static void da9052_ts_adc_toggle(struct da9052_tsi *tsi, bool on)
35{
36 da9052_reg_update(tsi->da9052, DA9052_TSI_CONT_A_REG, 1 << 0, on);
37 tsi->adc_on = on;
38}
39
40static irqreturn_t da9052_ts_pendwn_irq(int irq, void *data)
41{
42 struct da9052_tsi *tsi = data;
43
44 if (!tsi->stopped) {
45
46 da9052_disable_irq_nosync(tsi->da9052, DA9052_IRQ_PENDOWN);
47 da9052_enable_irq(tsi->da9052, DA9052_IRQ_TSIREADY);
48
49 da9052_ts_adc_toggle(tsi, true);
50
51 schedule_delayed_work(&tsi->ts_pen_work, HZ / 50);
52 }
53
54 return IRQ_HANDLED;
55}
56
57static void da9052_ts_read(struct da9052_tsi *tsi)
58{
59 struct input_dev *input = tsi->dev;
60 int ret;
61 u16 x, y, z;
62 u8 v;
63
64 ret = da9052_reg_read(tsi->da9052, DA9052_TSI_X_MSB_REG);
65 if (ret < 0)
66 return;
67
68 x = (u16) ret;
69
70 ret = da9052_reg_read(tsi->da9052, DA9052_TSI_Y_MSB_REG);
71 if (ret < 0)
72 return;
73
74 y = (u16) ret;
75
76 ret = da9052_reg_read(tsi->da9052, DA9052_TSI_Z_MSB_REG);
77 if (ret < 0)
78 return;
79
80 z = (u16) ret;
81
82 ret = da9052_reg_read(tsi->da9052, DA9052_TSI_LSB_REG);
83 if (ret < 0)
84 return;
85
86 v = (u8) ret;
87
88 x = ((x << 2) & 0x3fc) | (v & 0x3);
89 y = ((y << 2) & 0x3fc) | ((v & 0xc) >> 2);
90 z = ((z << 2) & 0x3fc) | ((v & 0x30) >> 4);
91
92 input_report_key(input, BTN_TOUCH, 1);
93 input_report_abs(input, ABS_X, x);
94 input_report_abs(input, ABS_Y, y);
95 input_report_abs(input, ABS_PRESSURE, z);
96 input_sync(input);
97}
98
99static irqreturn_t da9052_ts_datardy_irq(int irq, void *data)
100{
101 struct da9052_tsi *tsi = data;
102
103 da9052_ts_read(tsi);
104
105 return IRQ_HANDLED;
106}
107
108static void da9052_ts_pen_work(struct work_struct *work)
109{
110 struct da9052_tsi *tsi = container_of(work, struct da9052_tsi,
111 ts_pen_work.work);
112 if (!tsi->stopped) {
113 int ret = da9052_reg_read(tsi->da9052, DA9052_TSI_LSB_REG);
114 if (ret < 0 || (ret & TSI_PEN_DOWN_STATUS)) {
115
116 schedule_delayed_work(&tsi->ts_pen_work, HZ / 50);
117 } else {
118 struct input_dev *input = tsi->dev;
119
120
121 da9052_ts_adc_toggle(tsi, false);
122
123
124 input_report_key(input, BTN_TOUCH, 0);
125 input_report_abs(input, ABS_PRESSURE, 0);
126 input_sync(input);
127
128
129
130
131
132 ret = da9052_reg_update(tsi->da9052,
133 DA9052_EVENT_B_REG, 0xC0, 0xC0);
134 if (ret < 0)
135 return;
136
137
138 da9052_disable_irq(tsi->da9052, DA9052_IRQ_TSIREADY);
139 da9052_enable_irq(tsi->da9052, DA9052_IRQ_PENDOWN);
140 }
141 }
142}
143
144static int da9052_ts_configure_gpio(struct da9052 *da9052)
145{
146 int error;
147
148 error = da9052_reg_update(da9052, DA9052_GPIO_2_3_REG, 0x30, 0);
149 if (error < 0)
150 return error;
151
152 error = da9052_reg_update(da9052, DA9052_GPIO_4_5_REG, 0x33, 0);
153 if (error < 0)
154 return error;
155
156 error = da9052_reg_update(da9052, DA9052_GPIO_6_7_REG, 0x33, 0);
157 if (error < 0)
158 return error;
159
160 return 0;
161}
162
163static int da9052_configure_tsi(struct da9052_tsi *tsi)
164{
165 int error;
166
167 error = da9052_ts_configure_gpio(tsi->da9052);
168 if (error)
169 return error;
170
171
172 error = da9052_reg_update(tsi->da9052, DA9052_ADC_CONT_REG,
173 1 << 6, 1 << 6);
174 if (error < 0)
175 return error;
176
177
178 error = da9052_reg_update(tsi->da9052, DA9052_TSI_CONT_A_REG, 0xFC, 0xC0);
179 if (error < 0)
180 return error;
181
182
183 error = da9052_reg_write(tsi->da9052, DA9052_LDO9_REG, 0x59);
184 if (error < 0)
185 return error;
186
187 return 0;
188}
189
190static int da9052_ts_input_open(struct input_dev *input_dev)
191{
192 struct da9052_tsi *tsi = input_get_drvdata(input_dev);
193
194 tsi->stopped = false;
195 mb();
196
197
198 da9052_enable_irq(tsi->da9052, DA9052_IRQ_PENDOWN);
199
200
201 return da9052_reg_update(tsi->da9052, DA9052_TSI_CONT_A_REG,
202 1 << 1, 1 << 1);
203}
204
205static void da9052_ts_input_close(struct input_dev *input_dev)
206{
207 struct da9052_tsi *tsi = input_get_drvdata(input_dev);
208
209 tsi->stopped = true;
210 mb();
211 da9052_disable_irq(tsi->da9052, DA9052_IRQ_PENDOWN);
212 cancel_delayed_work_sync(&tsi->ts_pen_work);
213
214 if (tsi->adc_on) {
215 da9052_disable_irq(tsi->da9052, DA9052_IRQ_TSIREADY);
216 da9052_ts_adc_toggle(tsi, false);
217
218
219
220
221
222
223 da9052_enable_irq(tsi->da9052, DA9052_IRQ_PENDOWN);
224 }
225
226
227 da9052_reg_update(tsi->da9052, DA9052_TSI_CONT_A_REG, 1 << 1, 0);
228}
229
230static int da9052_ts_probe(struct platform_device *pdev)
231{
232 struct da9052 *da9052;
233 struct da9052_tsi *tsi;
234 struct input_dev *input_dev;
235 int error;
236
237 da9052 = dev_get_drvdata(pdev->dev.parent);
238 if (!da9052)
239 return -EINVAL;
240
241 tsi = kzalloc(sizeof(struct da9052_tsi), GFP_KERNEL);
242 input_dev = input_allocate_device();
243 if (!tsi || !input_dev) {
244 error = -ENOMEM;
245 goto err_free_mem;
246 }
247
248 tsi->da9052 = da9052;
249 tsi->dev = input_dev;
250 tsi->stopped = true;
251 INIT_DELAYED_WORK(&tsi->ts_pen_work, da9052_ts_pen_work);
252
253 input_dev->id.version = 0x0101;
254 input_dev->id.vendor = 0x15B6;
255 input_dev->id.product = 0x9052;
256 input_dev->name = "Dialog DA9052 TouchScreen Driver";
257 input_dev->dev.parent = &pdev->dev;
258 input_dev->open = da9052_ts_input_open;
259 input_dev->close = da9052_ts_input_close;
260
261 __set_bit(EV_ABS, input_dev->evbit);
262 __set_bit(EV_KEY, input_dev->evbit);
263 __set_bit(BTN_TOUCH, input_dev->keybit);
264
265 input_set_abs_params(input_dev, ABS_X, 0, 1023, 0, 0);
266 input_set_abs_params(input_dev, ABS_Y, 0, 1023, 0, 0);
267 input_set_abs_params(input_dev, ABS_PRESSURE, 0, 1023, 0, 0);
268
269 input_set_drvdata(input_dev, tsi);
270
271
272 da9052_reg_update(tsi->da9052, DA9052_TSI_CONT_A_REG, 1 << 1, 0);
273
274
275 da9052_ts_adc_toggle(tsi, false);
276
277 error = da9052_request_irq(tsi->da9052, DA9052_IRQ_PENDOWN,
278 "pendown-irq", da9052_ts_pendwn_irq, tsi);
279 if (error) {
280 dev_err(tsi->da9052->dev,
281 "Failed to register PENDWN IRQ: %d\n", error);
282 goto err_free_mem;
283 }
284
285 error = da9052_request_irq(tsi->da9052, DA9052_IRQ_TSIREADY,
286 "tsiready-irq", da9052_ts_datardy_irq, tsi);
287 if (error) {
288 dev_err(tsi->da9052->dev,
289 "Failed to register TSIRDY IRQ :%d\n", error);
290 goto err_free_pendwn_irq;
291 }
292
293
294 da9052_disable_irq(tsi->da9052, DA9052_IRQ_PENDOWN);
295 da9052_disable_irq(tsi->da9052, DA9052_IRQ_TSIREADY);
296
297 error = da9052_configure_tsi(tsi);
298 if (error)
299 goto err_free_datardy_irq;
300
301 error = input_register_device(tsi->dev);
302 if (error)
303 goto err_free_datardy_irq;
304
305 platform_set_drvdata(pdev, tsi);
306
307 return 0;
308
309err_free_datardy_irq:
310 da9052_free_irq(tsi->da9052, DA9052_IRQ_TSIREADY, tsi);
311err_free_pendwn_irq:
312 da9052_free_irq(tsi->da9052, DA9052_IRQ_PENDOWN, tsi);
313err_free_mem:
314 kfree(tsi);
315 input_free_device(input_dev);
316
317 return error;
318}
319
320static int da9052_ts_remove(struct platform_device *pdev)
321{
322 struct da9052_tsi *tsi = platform_get_drvdata(pdev);
323
324 da9052_reg_write(tsi->da9052, DA9052_LDO9_REG, 0x19);
325
326 da9052_free_irq(tsi->da9052, DA9052_IRQ_TSIREADY, tsi);
327 da9052_free_irq(tsi->da9052, DA9052_IRQ_PENDOWN, tsi);
328
329 input_unregister_device(tsi->dev);
330 kfree(tsi);
331
332 return 0;
333}
334
335static struct platform_driver da9052_tsi_driver = {
336 .probe = da9052_ts_probe,
337 .remove = da9052_ts_remove,
338 .driver = {
339 .name = "da9052-tsi",
340 },
341};
342
343module_platform_driver(da9052_tsi_driver);
344
345MODULE_DESCRIPTION("Touchscreen driver for Dialog Semiconductor DA9052");
346MODULE_AUTHOR("Anthony Olech <Anthony.Olech@diasemi.com>");
347MODULE_LICENSE("GPL");
348MODULE_ALIAS("platform:da9052-tsi");
349
