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1 | /* |
2 | * TSI driver for Dialog DA9052 | |
3 | * | |
4 | * Copyright(c) 2012 Dialog Semiconductor Ltd. | |
5 | * | |
6 | * Author: David Dajun Chen <dchen@diasemi.com> | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify it | |
9 | * under the terms of the GNU General Public License as published by the | |
10 | * Free Software Foundation; either version 2 of the License, or (at your | |
11 | * option) any later version. | |
12 | * | |
13 | */ | |
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 | ||
25 | struct da9052_tsi { | |
26 | struct da9052 *da9052; | |
27 | struct input_dev *dev; | |
28 | struct delayed_work ts_pen_work; | |
29 | struct mutex mutex; | |
30 | unsigned int irq_pendwn; | |
31 | unsigned int irq_datardy; | |
32 | bool stopped; | |
33 | bool adc_on; | |
34 | }; | |
35 | ||
36 | static void da9052_ts_adc_toggle(struct da9052_tsi *tsi, bool on) | |
37 | { | |
38 | da9052_reg_update(tsi->da9052, DA9052_TSI_CONT_A_REG, 1 << 0, on); | |
39 | tsi->adc_on = on; | |
40 | } | |
41 | ||
42 | static irqreturn_t da9052_ts_pendwn_irq(int irq, void *data) | |
43 | { | |
44 | struct da9052_tsi *tsi = data; | |
45 | ||
46 | if (!tsi->stopped) { | |
47 | /* Mask PEN_DOWN event and unmask TSI_READY event */ | |
48 | disable_irq_nosync(tsi->irq_pendwn); | |
49 | enable_irq(tsi->irq_datardy); | |
50 | ||
51 | da9052_ts_adc_toggle(tsi, true); | |
52 | ||
53 | schedule_delayed_work(&tsi->ts_pen_work, HZ / 50); | |
54 | } | |
55 | ||
56 | return IRQ_HANDLED; | |
57 | } | |
58 | ||
59 | static void da9052_ts_read(struct da9052_tsi *tsi) | |
60 | { | |
61 | struct input_dev *input = tsi->dev; | |
62 | int ret; | |
63 | u16 x, y, z; | |
64 | u8 v; | |
65 | ||
66 | ret = da9052_reg_read(tsi->da9052, DA9052_TSI_X_MSB_REG); | |
67 | if (ret < 0) | |
68 | return; | |
69 | ||
70 | x = (u16) ret; | |
71 | ||
72 | ret = da9052_reg_read(tsi->da9052, DA9052_TSI_Y_MSB_REG); | |
73 | if (ret < 0) | |
74 | return; | |
75 | ||
76 | y = (u16) ret; | |
77 | ||
78 | ret = da9052_reg_read(tsi->da9052, DA9052_TSI_Z_MSB_REG); | |
79 | if (ret < 0) | |
80 | return; | |
81 | ||
82 | z = (u16) ret; | |
83 | ||
84 | ret = da9052_reg_read(tsi->da9052, DA9052_TSI_LSB_REG); | |
85 | if (ret < 0) | |
86 | return; | |
87 | ||
88 | v = (u8) ret; | |
89 | ||
90 | x = ((x << 2) & 0x3fc) | (v & 0x3); | |
91 | y = ((y << 2) & 0x3fc) | ((v & 0xc) >> 2); | |
92 | z = ((z << 2) & 0x3fc) | ((v & 0x30) >> 4); | |
93 | ||
94 | input_report_key(input, BTN_TOUCH, 1); | |
95 | input_report_abs(input, ABS_X, x); | |
96 | input_report_abs(input, ABS_Y, y); | |
97 | input_report_abs(input, ABS_PRESSURE, z); | |
98 | input_sync(input); | |
99 | } | |
100 | ||
101 | static irqreturn_t da9052_ts_datardy_irq(int irq, void *data) | |
102 | { | |
103 | struct da9052_tsi *tsi = data; | |
104 | ||
105 | da9052_ts_read(tsi); | |
106 | ||
107 | return IRQ_HANDLED; | |
108 | } | |
109 | ||
110 | static void da9052_ts_pen_work(struct work_struct *work) | |
111 | { | |
112 | struct da9052_tsi *tsi = container_of(work, struct da9052_tsi, | |
113 | ts_pen_work.work); | |
114 | if (!tsi->stopped) { | |
115 | int ret = da9052_reg_read(tsi->da9052, DA9052_TSI_LSB_REG); | |
116 | if (ret < 0 || (ret & TSI_PEN_DOWN_STATUS)) { | |
117 | /* Pen is still DOWN (or read error) */ | |
118 | schedule_delayed_work(&tsi->ts_pen_work, HZ / 50); | |
119 | } else { | |
120 | struct input_dev *input = tsi->dev; | |
121 | ||
122 | /* Pen UP */ | |
123 | da9052_ts_adc_toggle(tsi, false); | |
124 | ||
125 | /* Report Pen UP */ | |
126 | input_report_key(input, BTN_TOUCH, 0); | |
127 | input_report_abs(input, ABS_PRESSURE, 0); | |
128 | input_sync(input); | |
129 | ||
130 | /* | |
131 | * FIXME: Fixes the unhandled irq issue when quick | |
132 | * pen down and pen up events occurs | |
133 | */ | |
134 | ret = da9052_reg_update(tsi->da9052, | |
135 | DA9052_EVENT_B_REG, 0xC0, 0xC0); | |
136 | if (ret < 0) | |
137 | return; | |
138 | ||
139 | /* Mask TSI_READY event and unmask PEN_DOWN event */ | |
140 | disable_irq(tsi->irq_datardy); | |
141 | enable_irq(tsi->irq_pendwn); | |
142 | } | |
143 | } | |
144 | } | |
145 | ||
146 | static int __devinit da9052_ts_configure_gpio(struct da9052 *da9052) | |
147 | { | |
148 | int error; | |
149 | ||
150 | error = da9052_reg_update(da9052, DA9052_GPIO_2_3_REG, 0x30, 0); | |
151 | if (error < 0) | |
152 | return error; | |
153 | ||
154 | error = da9052_reg_update(da9052, DA9052_GPIO_4_5_REG, 0x33, 0); | |
155 | if (error < 0) | |
156 | return error; | |
157 | ||
158 | error = da9052_reg_update(da9052, DA9052_GPIO_6_7_REG, 0x33, 0); | |
159 | if (error < 0) | |
160 | return error; | |
161 | ||
162 | return 0; | |
163 | } | |
164 | ||
165 | static int __devinit da9052_configure_tsi(struct da9052_tsi *tsi) | |
166 | { | |
167 | int error; | |
168 | ||
169 | error = da9052_ts_configure_gpio(tsi->da9052); | |
170 | if (error) | |
171 | return error; | |
172 | ||
173 | /* Measure TSI sample every 1ms */ | |
174 | error = da9052_reg_update(tsi->da9052, DA9052_ADC_CONT_REG, | |
175 | 1 << 6, 1 << 6); | |
176 | if (error < 0) | |
177 | return error; | |
178 | ||
179 | /* TSI_DELAY: 3 slots, TSI_SKIP: 0 slots, TSI_MODE: XYZP */ | |
180 | error = da9052_reg_update(tsi->da9052, DA9052_TSI_CONT_A_REG, 0xFC, 0xC0); | |
181 | if (error < 0) | |
182 | return error; | |
183 | ||
184 | /* Supply TSIRef through LD09 */ | |
185 | error = da9052_reg_write(tsi->da9052, DA9052_LDO9_REG, 0x59); | |
186 | if (error < 0) | |
187 | return error; | |
188 | ||
189 | return 0; | |
190 | } | |
191 | ||
192 | static int da9052_ts_input_open(struct input_dev *input_dev) | |
193 | { | |
194 | struct da9052_tsi *tsi = input_get_drvdata(input_dev); | |
195 | ||
196 | tsi->stopped = false; | |
197 | mb(); | |
198 | ||
199 | /* Unmask PEN_DOWN event */ | |
200 | enable_irq(tsi->irq_pendwn); | |
201 | ||
202 | /* Enable Pen Detect Circuit */ | |
203 | return da9052_reg_update(tsi->da9052, DA9052_TSI_CONT_A_REG, | |
204 | 1 << 1, 1 << 1); | |
205 | } | |
206 | ||
207 | static void da9052_ts_input_close(struct input_dev *input_dev) | |
208 | { | |
209 | struct da9052_tsi *tsi = input_get_drvdata(input_dev); | |
210 | ||
211 | tsi->stopped = true; | |
212 | mb(); | |
213 | disable_irq(tsi->irq_pendwn); | |
214 | cancel_delayed_work_sync(&tsi->ts_pen_work); | |
215 | ||
216 | if (tsi->adc_on) { | |
217 | disable_irq(tsi->irq_datardy); | |
218 | da9052_ts_adc_toggle(tsi, false); | |
219 | ||
220 | /* | |
221 | * If ADC was on that means that pendwn IRQ was disabled | |
222 | * twice and we need to enable it to keep enable/disable | |
223 | * counter balanced. IRQ is still off though. | |
224 | */ | |
225 | enable_irq(tsi->irq_pendwn); | |
226 | } | |
227 | ||
228 | /* Disable Pen Detect Circuit */ | |
229 | da9052_reg_update(tsi->da9052, DA9052_TSI_CONT_A_REG, 1 << 1, 0); | |
230 | } | |
231 | ||
232 | static int __devinit da9052_ts_probe(struct platform_device *pdev) | |
233 | { | |
234 | struct da9052 *da9052; | |
235 | struct da9052_tsi *tsi; | |
236 | struct input_dev *input_dev; | |
237 | int irq_pendwn; | |
238 | int irq_datardy; | |
239 | int error; | |
240 | ||
241 | da9052 = dev_get_drvdata(pdev->dev.parent); | |
242 | if (!da9052) | |
243 | return -EINVAL; | |
244 | ||
245 | irq_pendwn = platform_get_irq_byname(pdev, "PENDWN"); | |
246 | irq_datardy = platform_get_irq_byname(pdev, "TSIRDY"); | |
247 | if (irq_pendwn < 0 || irq_datardy < 0) { | |
248 | dev_err(da9052->dev, "Unable to determine device interrupts\n"); | |
249 | return -ENXIO; | |
250 | } | |
251 | ||
252 | tsi = kzalloc(sizeof(struct da9052_tsi), GFP_KERNEL); | |
253 | input_dev = input_allocate_device(); | |
254 | if (!tsi || !input_dev) { | |
255 | error = -ENOMEM; | |
256 | goto err_free_mem; | |
257 | } | |
258 | ||
259 | tsi->da9052 = da9052; | |
260 | tsi->dev = input_dev; | |
261 | tsi->irq_pendwn = da9052->irq_base + irq_pendwn; | |
262 | tsi->irq_datardy = da9052->irq_base + irq_datardy; | |
263 | tsi->stopped = true; | |
264 | INIT_DELAYED_WORK(&tsi->ts_pen_work, da9052_ts_pen_work); | |
265 | ||
266 | input_dev->id.version = 0x0101; | |
267 | input_dev->id.vendor = 0x15B6; | |
268 | input_dev->id.product = 0x9052; | |
269 | input_dev->name = "Dialog DA9052 TouchScreen Driver"; | |
270 | input_dev->dev.parent = &pdev->dev; | |
271 | input_dev->open = da9052_ts_input_open; | |
272 | input_dev->close = da9052_ts_input_close; | |
273 | ||
274 | __set_bit(EV_ABS, input_dev->evbit); | |
275 | __set_bit(EV_KEY, input_dev->evbit); | |
276 | __set_bit(BTN_TOUCH, input_dev->keybit); | |
277 | ||
278 | input_set_abs_params(input_dev, ABS_X, 0, 1023, 0, 0); | |
279 | input_set_abs_params(input_dev, ABS_Y, 0, 1023, 0, 0); | |
280 | input_set_abs_params(input_dev, ABS_PRESSURE, 0, 1023, 0, 0); | |
281 | ||
282 | input_set_drvdata(input_dev, tsi); | |
283 | ||
284 | /* Disable Pen Detect Circuit */ | |
285 | da9052_reg_update(tsi->da9052, DA9052_TSI_CONT_A_REG, 1 << 1, 0); | |
286 | ||
287 | /* Disable ADC */ | |
288 | da9052_ts_adc_toggle(tsi, false); | |
289 | ||
290 | error = request_threaded_irq(tsi->irq_pendwn, | |
291 | NULL, da9052_ts_pendwn_irq, | |
292 | IRQF_TRIGGER_LOW | IRQF_ONESHOT, | |
293 | "PENDWN", tsi); | |
294 | if (error) { | |
295 | dev_err(tsi->da9052->dev, | |
296 | "Failed to register PENDWN IRQ %d, error = %d\n", | |
297 | tsi->irq_pendwn, error); | |
298 | goto err_free_mem; | |
299 | } | |
300 | ||
301 | error = request_threaded_irq(tsi->irq_datardy, | |
302 | NULL, da9052_ts_datardy_irq, | |
303 | IRQF_TRIGGER_LOW | IRQF_ONESHOT, | |
304 | "TSIRDY", tsi); | |
305 | if (error) { | |
306 | dev_err(tsi->da9052->dev, | |
307 | "Failed to register TSIRDY IRQ %d, error = %d\n", | |
308 | tsi->irq_datardy, error); | |
309 | goto err_free_pendwn_irq; | |
310 | } | |
311 | ||
312 | /* Mask PEN_DOWN and TSI_READY events */ | |
313 | disable_irq(tsi->irq_pendwn); | |
314 | disable_irq(tsi->irq_datardy); | |
315 | ||
316 | error = da9052_configure_tsi(tsi); | |
317 | if (error) | |
318 | goto err_free_datardy_irq; | |
319 | ||
320 | error = input_register_device(tsi->dev); | |
321 | if (error) | |
322 | goto err_free_datardy_irq; | |
323 | ||
324 | platform_set_drvdata(pdev, tsi); | |
325 | ||
326 | return 0; | |
327 | ||
328 | err_free_datardy_irq: | |
329 | free_irq(tsi->irq_datardy, tsi); | |
330 | err_free_pendwn_irq: | |
331 | free_irq(tsi->irq_pendwn, tsi); | |
332 | err_free_mem: | |
333 | kfree(tsi); | |
334 | input_free_device(input_dev); | |
335 | ||
336 | return error; | |
337 | } | |
338 | ||
339 | static int __devexit da9052_ts_remove(struct platform_device *pdev) | |
340 | { | |
341 | struct da9052_tsi *tsi = platform_get_drvdata(pdev); | |
342 | ||
343 | da9052_reg_write(tsi->da9052, DA9052_LDO9_REG, 0x19); | |
344 | ||
345 | free_irq(tsi->irq_pendwn, tsi); | |
346 | free_irq(tsi->irq_datardy, tsi); | |
347 | ||
348 | input_unregister_device(tsi->dev); | |
349 | kfree(tsi); | |
350 | ||
351 | platform_set_drvdata(pdev, NULL); | |
352 | ||
353 | return 0; | |
354 | } | |
355 | ||
356 | static struct platform_driver da9052_tsi_driver = { | |
357 | .probe = da9052_ts_probe, | |
358 | .remove = __devexit_p(da9052_ts_remove), | |
359 | .driver = { | |
360 | .name = "da9052-tsi", | |
361 | .owner = THIS_MODULE, | |
362 | }, | |
363 | }; | |
364 | ||
365 | module_platform_driver(da9052_tsi_driver); | |
366 | ||
367 | MODULE_DESCRIPTION("Touchscreen driver for Dialog Semiconductor DA9052"); | |
368 | MODULE_AUTHOR("Anthony Olech <Anthony.Olech@diasemi.com>"); | |
369 | MODULE_LICENSE("GPL"); | |
370 | MODULE_ALIAS("platform:da9052-tsi"); |