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