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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; | |
eead75a2 AJ |
29 | bool stopped; |
30 | bool adc_on; | |
31 | }; | |
32 | ||
33 | static void da9052_ts_adc_toggle(struct da9052_tsi *tsi, bool on) | |
34 | { | |
35 | da9052_reg_update(tsi->da9052, DA9052_TSI_CONT_A_REG, 1 << 0, on); | |
36 | tsi->adc_on = on; | |
37 | } | |
38 | ||
39 | static irqreturn_t da9052_ts_pendwn_irq(int irq, void *data) | |
40 | { | |
41 | struct da9052_tsi *tsi = data; | |
42 | ||
43 | if (!tsi->stopped) { | |
44 | /* Mask PEN_DOWN event and unmask TSI_READY event */ | |
8f520803 FE |
45 | da9052_disable_irq_nosync(tsi->da9052, DA9052_IRQ_PENDOWN); |
46 | da9052_enable_irq(tsi->da9052, DA9052_IRQ_TSIREADY); | |
eead75a2 AJ |
47 | |
48 | da9052_ts_adc_toggle(tsi, true); | |
49 | ||
50 | schedule_delayed_work(&tsi->ts_pen_work, HZ / 50); | |
51 | } | |
52 | ||
53 | return IRQ_HANDLED; | |
54 | } | |
55 | ||
56 | static void da9052_ts_read(struct da9052_tsi *tsi) | |
57 | { | |
58 | struct input_dev *input = tsi->dev; | |
59 | int ret; | |
60 | u16 x, y, z; | |
61 | u8 v; | |
62 | ||
63 | ret = da9052_reg_read(tsi->da9052, DA9052_TSI_X_MSB_REG); | |
64 | if (ret < 0) | |
65 | return; | |
66 | ||
67 | x = (u16) ret; | |
68 | ||
69 | ret = da9052_reg_read(tsi->da9052, DA9052_TSI_Y_MSB_REG); | |
70 | if (ret < 0) | |
71 | return; | |
72 | ||
73 | y = (u16) ret; | |
74 | ||
75 | ret = da9052_reg_read(tsi->da9052, DA9052_TSI_Z_MSB_REG); | |
76 | if (ret < 0) | |
77 | return; | |
78 | ||
79 | z = (u16) ret; | |
80 | ||
81 | ret = da9052_reg_read(tsi->da9052, DA9052_TSI_LSB_REG); | |
82 | if (ret < 0) | |
83 | return; | |
84 | ||
85 | v = (u8) ret; | |
86 | ||
87 | x = ((x << 2) & 0x3fc) | (v & 0x3); | |
88 | y = ((y << 2) & 0x3fc) | ((v & 0xc) >> 2); | |
89 | z = ((z << 2) & 0x3fc) | ((v & 0x30) >> 4); | |
90 | ||
91 | input_report_key(input, BTN_TOUCH, 1); | |
92 | input_report_abs(input, ABS_X, x); | |
93 | input_report_abs(input, ABS_Y, y); | |
94 | input_report_abs(input, ABS_PRESSURE, z); | |
95 | input_sync(input); | |
96 | } | |
97 | ||
98 | static irqreturn_t da9052_ts_datardy_irq(int irq, void *data) | |
99 | { | |
100 | struct da9052_tsi *tsi = data; | |
101 | ||
102 | da9052_ts_read(tsi); | |
103 | ||
104 | return IRQ_HANDLED; | |
105 | } | |
106 | ||
107 | static void da9052_ts_pen_work(struct work_struct *work) | |
108 | { | |
109 | struct da9052_tsi *tsi = container_of(work, struct da9052_tsi, | |
110 | ts_pen_work.work); | |
111 | if (!tsi->stopped) { | |
112 | int ret = da9052_reg_read(tsi->da9052, DA9052_TSI_LSB_REG); | |
113 | if (ret < 0 || (ret & TSI_PEN_DOWN_STATUS)) { | |
114 | /* Pen is still DOWN (or read error) */ | |
115 | schedule_delayed_work(&tsi->ts_pen_work, HZ / 50); | |
116 | } else { | |
117 | struct input_dev *input = tsi->dev; | |
118 | ||
119 | /* Pen UP */ | |
120 | da9052_ts_adc_toggle(tsi, false); | |
121 | ||
122 | /* Report Pen UP */ | |
123 | input_report_key(input, BTN_TOUCH, 0); | |
124 | input_report_abs(input, ABS_PRESSURE, 0); | |
125 | input_sync(input); | |
126 | ||
127 | /* | |
128 | * FIXME: Fixes the unhandled irq issue when quick | |
129 | * pen down and pen up events occurs | |
130 | */ | |
131 | ret = da9052_reg_update(tsi->da9052, | |
132 | DA9052_EVENT_B_REG, 0xC0, 0xC0); | |
133 | if (ret < 0) | |
134 | return; | |
135 | ||
136 | /* Mask TSI_READY event and unmask PEN_DOWN event */ | |
8f520803 FE |
137 | da9052_disable_irq(tsi->da9052, DA9052_IRQ_TSIREADY); |
138 | da9052_enable_irq(tsi->da9052, DA9052_IRQ_PENDOWN); | |
eead75a2 AJ |
139 | } |
140 | } | |
141 | } | |
142 | ||
5298cc4c | 143 | static int da9052_ts_configure_gpio(struct da9052 *da9052) |
eead75a2 AJ |
144 | { |
145 | int error; | |
146 | ||
147 | error = da9052_reg_update(da9052, DA9052_GPIO_2_3_REG, 0x30, 0); | |
148 | if (error < 0) | |
149 | return error; | |
150 | ||
151 | error = da9052_reg_update(da9052, DA9052_GPIO_4_5_REG, 0x33, 0); | |
152 | if (error < 0) | |
153 | return error; | |
154 | ||
155 | error = da9052_reg_update(da9052, DA9052_GPIO_6_7_REG, 0x33, 0); | |
156 | if (error < 0) | |
157 | return error; | |
158 | ||
159 | return 0; | |
160 | } | |
161 | ||
5298cc4c | 162 | static int da9052_configure_tsi(struct da9052_tsi *tsi) |
eead75a2 AJ |
163 | { |
164 | int error; | |
165 | ||
166 | error = da9052_ts_configure_gpio(tsi->da9052); | |
167 | if (error) | |
168 | return error; | |
169 | ||
170 | /* Measure TSI sample every 1ms */ | |
171 | error = da9052_reg_update(tsi->da9052, DA9052_ADC_CONT_REG, | |
172 | 1 << 6, 1 << 6); | |
173 | if (error < 0) | |
174 | return error; | |
175 | ||
176 | /* TSI_DELAY: 3 slots, TSI_SKIP: 0 slots, TSI_MODE: XYZP */ | |
177 | error = da9052_reg_update(tsi->da9052, DA9052_TSI_CONT_A_REG, 0xFC, 0xC0); | |
178 | if (error < 0) | |
179 | return error; | |
180 | ||
181 | /* Supply TSIRef through LD09 */ | |
182 | error = da9052_reg_write(tsi->da9052, DA9052_LDO9_REG, 0x59); | |
183 | if (error < 0) | |
184 | return error; | |
185 | ||
186 | return 0; | |
187 | } | |
188 | ||
189 | static int da9052_ts_input_open(struct input_dev *input_dev) | |
190 | { | |
191 | struct da9052_tsi *tsi = input_get_drvdata(input_dev); | |
192 | ||
193 | tsi->stopped = false; | |
194 | mb(); | |
195 | ||
196 | /* Unmask PEN_DOWN event */ | |
8f520803 | 197 | da9052_enable_irq(tsi->da9052, DA9052_IRQ_PENDOWN); |
eead75a2 AJ |
198 | |
199 | /* Enable Pen Detect Circuit */ | |
200 | return da9052_reg_update(tsi->da9052, DA9052_TSI_CONT_A_REG, | |
201 | 1 << 1, 1 << 1); | |
202 | } | |
203 | ||
204 | static void da9052_ts_input_close(struct input_dev *input_dev) | |
205 | { | |
206 | struct da9052_tsi *tsi = input_get_drvdata(input_dev); | |
207 | ||
208 | tsi->stopped = true; | |
209 | mb(); | |
8f520803 | 210 | da9052_disable_irq(tsi->da9052, DA9052_IRQ_PENDOWN); |
eead75a2 AJ |
211 | cancel_delayed_work_sync(&tsi->ts_pen_work); |
212 | ||
213 | if (tsi->adc_on) { | |
8f520803 | 214 | da9052_disable_irq(tsi->da9052, DA9052_IRQ_TSIREADY); |
eead75a2 AJ |
215 | da9052_ts_adc_toggle(tsi, false); |
216 | ||
217 | /* | |
218 | * If ADC was on that means that pendwn IRQ was disabled | |
219 | * twice and we need to enable it to keep enable/disable | |
220 | * counter balanced. IRQ is still off though. | |
221 | */ | |
8f520803 | 222 | da9052_enable_irq(tsi->da9052, DA9052_IRQ_PENDOWN); |
eead75a2 AJ |
223 | } |
224 | ||
225 | /* Disable Pen Detect Circuit */ | |
226 | da9052_reg_update(tsi->da9052, DA9052_TSI_CONT_A_REG, 1 << 1, 0); | |
227 | } | |
228 | ||
5298cc4c | 229 | static int da9052_ts_probe(struct platform_device *pdev) |
eead75a2 AJ |
230 | { |
231 | struct da9052 *da9052; | |
232 | struct da9052_tsi *tsi; | |
233 | struct input_dev *input_dev; | |
eead75a2 AJ |
234 | int error; |
235 | ||
236 | da9052 = dev_get_drvdata(pdev->dev.parent); | |
237 | if (!da9052) | |
238 | return -EINVAL; | |
239 | ||
eead75a2 AJ |
240 | tsi = kzalloc(sizeof(struct da9052_tsi), GFP_KERNEL); |
241 | input_dev = input_allocate_device(); | |
242 | if (!tsi || !input_dev) { | |
243 | error = -ENOMEM; | |
244 | goto err_free_mem; | |
245 | } | |
246 | ||
247 | tsi->da9052 = da9052; | |
248 | tsi->dev = input_dev; | |
eead75a2 AJ |
249 | tsi->stopped = true; |
250 | INIT_DELAYED_WORK(&tsi->ts_pen_work, da9052_ts_pen_work); | |
251 | ||
252 | input_dev->id.version = 0x0101; | |
253 | input_dev->id.vendor = 0x15B6; | |
254 | input_dev->id.product = 0x9052; | |
255 | input_dev->name = "Dialog DA9052 TouchScreen Driver"; | |
256 | input_dev->dev.parent = &pdev->dev; | |
257 | input_dev->open = da9052_ts_input_open; | |
258 | input_dev->close = da9052_ts_input_close; | |
259 | ||
260 | __set_bit(EV_ABS, input_dev->evbit); | |
261 | __set_bit(EV_KEY, input_dev->evbit); | |
262 | __set_bit(BTN_TOUCH, input_dev->keybit); | |
263 | ||
264 | input_set_abs_params(input_dev, ABS_X, 0, 1023, 0, 0); | |
265 | input_set_abs_params(input_dev, ABS_Y, 0, 1023, 0, 0); | |
266 | input_set_abs_params(input_dev, ABS_PRESSURE, 0, 1023, 0, 0); | |
267 | ||
268 | input_set_drvdata(input_dev, tsi); | |
269 | ||
270 | /* Disable Pen Detect Circuit */ | |
271 | da9052_reg_update(tsi->da9052, DA9052_TSI_CONT_A_REG, 1 << 1, 0); | |
272 | ||
273 | /* Disable ADC */ | |
274 | da9052_ts_adc_toggle(tsi, false); | |
275 | ||
8f520803 FE |
276 | error = da9052_request_irq(tsi->da9052, DA9052_IRQ_PENDOWN, |
277 | "pendown-irq", da9052_ts_pendwn_irq, tsi); | |
eead75a2 AJ |
278 | if (error) { |
279 | dev_err(tsi->da9052->dev, | |
8f520803 | 280 | "Failed to register PENDWN IRQ: %d\n", error); |
eead75a2 AJ |
281 | goto err_free_mem; |
282 | } | |
283 | ||
8f520803 FE |
284 | error = da9052_request_irq(tsi->da9052, DA9052_IRQ_TSIREADY, |
285 | "tsiready-irq", da9052_ts_datardy_irq, tsi); | |
eead75a2 AJ |
286 | if (error) { |
287 | dev_err(tsi->da9052->dev, | |
8f520803 | 288 | "Failed to register TSIRDY IRQ :%d\n", error); |
eead75a2 AJ |
289 | goto err_free_pendwn_irq; |
290 | } | |
291 | ||
292 | /* Mask PEN_DOWN and TSI_READY events */ | |
8f520803 FE |
293 | da9052_disable_irq(tsi->da9052, DA9052_IRQ_PENDOWN); |
294 | da9052_disable_irq(tsi->da9052, DA9052_IRQ_TSIREADY); | |
eead75a2 AJ |
295 | |
296 | error = da9052_configure_tsi(tsi); | |
297 | if (error) | |
298 | goto err_free_datardy_irq; | |
299 | ||
300 | error = input_register_device(tsi->dev); | |
301 | if (error) | |
302 | goto err_free_datardy_irq; | |
303 | ||
304 | platform_set_drvdata(pdev, tsi); | |
305 | ||
306 | return 0; | |
307 | ||
308 | err_free_datardy_irq: | |
8f520803 | 309 | da9052_free_irq(tsi->da9052, DA9052_IRQ_TSIREADY, tsi); |
eead75a2 | 310 | err_free_pendwn_irq: |
8f520803 | 311 | da9052_free_irq(tsi->da9052, DA9052_IRQ_PENDOWN, tsi); |
eead75a2 AJ |
312 | err_free_mem: |
313 | kfree(tsi); | |
314 | input_free_device(input_dev); | |
315 | ||
316 | return error; | |
317 | } | |
318 | ||
e2619cf7 | 319 | static int da9052_ts_remove(struct platform_device *pdev) |
eead75a2 AJ |
320 | { |
321 | struct da9052_tsi *tsi = platform_get_drvdata(pdev); | |
322 | ||
323 | da9052_reg_write(tsi->da9052, DA9052_LDO9_REG, 0x19); | |
324 | ||
8f520803 FE |
325 | da9052_free_irq(tsi->da9052, DA9052_IRQ_TSIREADY, tsi); |
326 | da9052_free_irq(tsi->da9052, DA9052_IRQ_PENDOWN, tsi); | |
eead75a2 AJ |
327 | |
328 | input_unregister_device(tsi->dev); | |
329 | kfree(tsi); | |
330 | ||
eead75a2 AJ |
331 | return 0; |
332 | } | |
333 | ||
334 | static struct platform_driver da9052_tsi_driver = { | |
335 | .probe = da9052_ts_probe, | |
1cb0aa88 | 336 | .remove = da9052_ts_remove, |
eead75a2 AJ |
337 | .driver = { |
338 | .name = "da9052-tsi", | |
eead75a2 AJ |
339 | }, |
340 | }; | |
341 | ||
342 | module_platform_driver(da9052_tsi_driver); | |
343 | ||
344 | MODULE_DESCRIPTION("Touchscreen driver for Dialog Semiconductor DA9052"); | |
345 | MODULE_AUTHOR("Anthony Olech <Anthony.Olech@diasemi.com>"); | |
346 | MODULE_LICENSE("GPL"); | |
347 | MODULE_ALIAS("platform:da9052-tsi"); |