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eead75a2 AJ |
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; | |
eead75a2 AJ |
30 | bool stopped; |
31 | bool adc_on; | |
32 | }; | |
33 | ||
34 | static 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 | ||
40 | static irqreturn_t da9052_ts_pendwn_irq(int irq, void *data) | |
41 | { | |
42 | struct da9052_tsi *tsi = data; | |
43 | ||
44 | if (!tsi->stopped) { | |
45 | /* Mask PEN_DOWN event and unmask TSI_READY event */ | |
8f520803 FE |
46 | da9052_disable_irq_nosync(tsi->da9052, DA9052_IRQ_PENDOWN); |
47 | da9052_enable_irq(tsi->da9052, DA9052_IRQ_TSIREADY); | |
eead75a2 AJ |
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 | ||
57 | static 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 | ||
99 | static 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 | ||
108 | static 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 | /* Pen is still DOWN (or read error) */ | |
116 | schedule_delayed_work(&tsi->ts_pen_work, HZ / 50); | |
117 | } else { | |
118 | struct input_dev *input = tsi->dev; | |
119 | ||
120 | /* Pen UP */ | |
121 | da9052_ts_adc_toggle(tsi, false); | |
122 | ||
123 | /* Report Pen UP */ | |
124 | input_report_key(input, BTN_TOUCH, 0); | |
125 | input_report_abs(input, ABS_PRESSURE, 0); | |
126 | input_sync(input); | |
127 | ||
128 | /* | |
129 | * FIXME: Fixes the unhandled irq issue when quick | |
130 | * pen down and pen up events occurs | |
131 | */ | |
132 | ret = da9052_reg_update(tsi->da9052, | |
133 | DA9052_EVENT_B_REG, 0xC0, 0xC0); | |
134 | if (ret < 0) | |
135 | return; | |
136 | ||
137 | /* Mask TSI_READY event and unmask PEN_DOWN event */ | |
8f520803 FE |
138 | da9052_disable_irq(tsi->da9052, DA9052_IRQ_TSIREADY); |
139 | da9052_enable_irq(tsi->da9052, DA9052_IRQ_PENDOWN); | |
eead75a2 AJ |
140 | } |
141 | } | |
142 | } | |
143 | ||
5298cc4c | 144 | static int da9052_ts_configure_gpio(struct da9052 *da9052) |
eead75a2 AJ |
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 | ||
5298cc4c | 163 | static int da9052_configure_tsi(struct da9052_tsi *tsi) |
eead75a2 AJ |
164 | { |
165 | int error; | |
166 | ||
167 | error = da9052_ts_configure_gpio(tsi->da9052); | |
168 | if (error) | |
169 | return error; | |
170 | ||
171 | /* Measure TSI sample every 1ms */ | |
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 | /* TSI_DELAY: 3 slots, TSI_SKIP: 0 slots, TSI_MODE: XYZP */ | |
178 | error = da9052_reg_update(tsi->da9052, DA9052_TSI_CONT_A_REG, 0xFC, 0xC0); | |
179 | if (error < 0) | |
180 | return error; | |
181 | ||
182 | /* Supply TSIRef through LD09 */ | |
183 | error = da9052_reg_write(tsi->da9052, DA9052_LDO9_REG, 0x59); | |
184 | if (error < 0) | |
185 | return error; | |
186 | ||
187 | return 0; | |
188 | } | |
189 | ||
190 | static 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 | /* Unmask PEN_DOWN event */ | |
8f520803 | 198 | da9052_enable_irq(tsi->da9052, DA9052_IRQ_PENDOWN); |
eead75a2 AJ |
199 | |
200 | /* Enable Pen Detect Circuit */ | |
201 | return da9052_reg_update(tsi->da9052, DA9052_TSI_CONT_A_REG, | |
202 | 1 << 1, 1 << 1); | |
203 | } | |
204 | ||
205 | static 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(); | |
8f520803 | 211 | da9052_disable_irq(tsi->da9052, DA9052_IRQ_PENDOWN); |
eead75a2 AJ |
212 | cancel_delayed_work_sync(&tsi->ts_pen_work); |
213 | ||
214 | if (tsi->adc_on) { | |
8f520803 | 215 | da9052_disable_irq(tsi->da9052, DA9052_IRQ_TSIREADY); |
eead75a2 AJ |
216 | da9052_ts_adc_toggle(tsi, false); |
217 | ||
218 | /* | |
219 | * If ADC was on that means that pendwn IRQ was disabled | |
220 | * twice and we need to enable it to keep enable/disable | |
221 | * counter balanced. IRQ is still off though. | |
222 | */ | |
8f520803 | 223 | da9052_enable_irq(tsi->da9052, DA9052_IRQ_PENDOWN); |
eead75a2 AJ |
224 | } |
225 | ||
226 | /* Disable Pen Detect Circuit */ | |
227 | da9052_reg_update(tsi->da9052, DA9052_TSI_CONT_A_REG, 1 << 1, 0); | |
228 | } | |
229 | ||
5298cc4c | 230 | static int da9052_ts_probe(struct platform_device *pdev) |
eead75a2 AJ |
231 | { |
232 | struct da9052 *da9052; | |
233 | struct da9052_tsi *tsi; | |
234 | struct input_dev *input_dev; | |
eead75a2 AJ |
235 | int error; |
236 | ||
237 | da9052 = dev_get_drvdata(pdev->dev.parent); | |
238 | if (!da9052) | |
239 | return -EINVAL; | |
240 | ||
eead75a2 AJ |
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; | |
eead75a2 AJ |
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 | /* Disable Pen Detect Circuit */ | |
272 | da9052_reg_update(tsi->da9052, DA9052_TSI_CONT_A_REG, 1 << 1, 0); | |
273 | ||
274 | /* Disable ADC */ | |
275 | da9052_ts_adc_toggle(tsi, false); | |
276 | ||
8f520803 FE |
277 | error = da9052_request_irq(tsi->da9052, DA9052_IRQ_PENDOWN, |
278 | "pendown-irq", da9052_ts_pendwn_irq, tsi); | |
eead75a2 AJ |
279 | if (error) { |
280 | dev_err(tsi->da9052->dev, | |
8f520803 | 281 | "Failed to register PENDWN IRQ: %d\n", error); |
eead75a2 AJ |
282 | goto err_free_mem; |
283 | } | |
284 | ||
8f520803 FE |
285 | error = da9052_request_irq(tsi->da9052, DA9052_IRQ_TSIREADY, |
286 | "tsiready-irq", da9052_ts_datardy_irq, tsi); | |
eead75a2 AJ |
287 | if (error) { |
288 | dev_err(tsi->da9052->dev, | |
8f520803 | 289 | "Failed to register TSIRDY IRQ :%d\n", error); |
eead75a2 AJ |
290 | goto err_free_pendwn_irq; |
291 | } | |
292 | ||
293 | /* Mask PEN_DOWN and TSI_READY events */ | |
8f520803 FE |
294 | da9052_disable_irq(tsi->da9052, DA9052_IRQ_PENDOWN); |
295 | da9052_disable_irq(tsi->da9052, DA9052_IRQ_TSIREADY); | |
eead75a2 AJ |
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 | ||
309 | err_free_datardy_irq: | |
8f520803 | 310 | da9052_free_irq(tsi->da9052, DA9052_IRQ_TSIREADY, tsi); |
eead75a2 | 311 | err_free_pendwn_irq: |
8f520803 | 312 | da9052_free_irq(tsi->da9052, DA9052_IRQ_PENDOWN, tsi); |
eead75a2 AJ |
313 | err_free_mem: |
314 | kfree(tsi); | |
315 | input_free_device(input_dev); | |
316 | ||
317 | return error; | |
318 | } | |
319 | ||
e2619cf7 | 320 | static int da9052_ts_remove(struct platform_device *pdev) |
eead75a2 AJ |
321 | { |
322 | struct da9052_tsi *tsi = platform_get_drvdata(pdev); | |
323 | ||
324 | da9052_reg_write(tsi->da9052, DA9052_LDO9_REG, 0x19); | |
325 | ||
8f520803 FE |
326 | da9052_free_irq(tsi->da9052, DA9052_IRQ_TSIREADY, tsi); |
327 | da9052_free_irq(tsi->da9052, DA9052_IRQ_PENDOWN, tsi); | |
eead75a2 AJ |
328 | |
329 | input_unregister_device(tsi->dev); | |
330 | kfree(tsi); | |
331 | ||
eead75a2 AJ |
332 | return 0; |
333 | } | |
334 | ||
335 | static struct platform_driver da9052_tsi_driver = { | |
336 | .probe = da9052_ts_probe, | |
1cb0aa88 | 337 | .remove = da9052_ts_remove, |
eead75a2 AJ |
338 | .driver = { |
339 | .name = "da9052-tsi", | |
eead75a2 AJ |
340 | }, |
341 | }; | |
342 | ||
343 | module_platform_driver(da9052_tsi_driver); | |
344 | ||
345 | MODULE_DESCRIPTION("Touchscreen driver for Dialog Semiconductor DA9052"); | |
346 | MODULE_AUTHOR("Anthony Olech <Anthony.Olech@diasemi.com>"); | |
347 | MODULE_LICENSE("GPL"); | |
348 | MODULE_ALIAS("platform:da9052-tsi"); |