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75259966 | 1 | /* |
75259966 TF |
2 | * Touchscreen driver for the tps6507x chip. |
3 | * | |
4 | * Copyright (c) 2009 RidgeRun (todd.fischer@ridgerun.com) | |
5 | * | |
6 | * Credits: | |
7 | * | |
8 | * Using code from tsc2007, MtekVision Co., Ltd. | |
9 | * | |
10 | * For licencing details see kernel-base/COPYING | |
11 | * | |
12 | * TPS65070, TPS65073, TPS650731, and TPS650732 support | |
13 | * 10 bit touch screen interface. | |
14 | */ | |
15 | ||
16 | #include <linux/module.h> | |
17 | #include <linux/workqueue.h> | |
18 | #include <linux/slab.h> | |
19 | #include <linux/input.h> | |
20 | #include <linux/platform_device.h> | |
21 | #include <linux/mfd/tps6507x.h> | |
22 | #include <linux/input/tps6507x-ts.h> | |
23 | #include <linux/delay.h> | |
24 | ||
25 | #define TSC_DEFAULT_POLL_PERIOD 30 /* ms */ | |
26 | #define TPS_DEFAULT_MIN_PRESSURE 0x30 | |
27 | #define MAX_10BIT ((1 << 10) - 1) | |
28 | ||
29 | #define TPS6507X_ADCONFIG_CONVERT_TS (TPS6507X_ADCONFIG_AD_ENABLE | \ | |
30 | TPS6507X_ADCONFIG_START_CONVERSION | \ | |
31 | TPS6507X_ADCONFIG_INPUT_REAL_TSC) | |
32 | #define TPS6507X_ADCONFIG_POWER_DOWN_TS (TPS6507X_ADCONFIG_INPUT_REAL_TSC) | |
33 | ||
34 | struct ts_event { | |
35 | u16 x; | |
36 | u16 y; | |
37 | u16 pressure; | |
38 | }; | |
39 | ||
40 | struct tps6507x_ts { | |
41 | struct input_dev *input_dev; | |
42 | struct device *dev; | |
43 | char phys[32]; | |
75259966 TF |
44 | struct delayed_work work; |
45 | unsigned polling; /* polling is active */ | |
46 | struct ts_event tc; | |
47 | struct tps6507x_dev *mfd; | |
48 | u16 model; | |
49 | unsigned pendown; | |
50 | int irq; | |
51 | void (*clear_penirq)(void); | |
52 | unsigned long poll_period; /* ms */ | |
53 | u16 min_pressure; | |
54 | int vref; /* non-zero to leave vref on */ | |
55 | }; | |
56 | ||
57 | static int tps6507x_read_u8(struct tps6507x_ts *tsc, u8 reg, u8 *data) | |
58 | { | |
59 | int err; | |
60 | ||
61 | err = tsc->mfd->read_dev(tsc->mfd, reg, 1, data); | |
62 | ||
63 | if (err) | |
64 | return err; | |
65 | ||
66 | return 0; | |
67 | } | |
68 | ||
69 | static int tps6507x_write_u8(struct tps6507x_ts *tsc, u8 reg, u8 data) | |
70 | { | |
71 | return tsc->mfd->write_dev(tsc->mfd, reg, 1, &data); | |
72 | } | |
73 | ||
74 | static s32 tps6507x_adc_conversion(struct tps6507x_ts *tsc, | |
75 | u8 tsc_mode, u16 *value) | |
76 | { | |
77 | s32 ret; | |
78 | u8 adc_status; | |
79 | u8 result; | |
80 | ||
81 | /* Route input signal to A/D converter */ | |
82 | ||
83 | ret = tps6507x_write_u8(tsc, TPS6507X_REG_TSCMODE, tsc_mode); | |
84 | if (ret) { | |
85 | dev_err(tsc->dev, "TSC mode read failed\n"); | |
86 | goto err; | |
87 | } | |
88 | ||
89 | /* Start A/D conversion */ | |
90 | ||
91 | ret = tps6507x_write_u8(tsc, TPS6507X_REG_ADCONFIG, | |
92 | TPS6507X_ADCONFIG_CONVERT_TS); | |
93 | if (ret) { | |
94 | dev_err(tsc->dev, "ADC config write failed\n"); | |
95 | return ret; | |
96 | } | |
97 | ||
98 | do { | |
99 | ret = tps6507x_read_u8(tsc, TPS6507X_REG_ADCONFIG, | |
100 | &adc_status); | |
101 | if (ret) { | |
102 | dev_err(tsc->dev, "ADC config read failed\n"); | |
103 | goto err; | |
104 | } | |
105 | } while (adc_status & TPS6507X_ADCONFIG_START_CONVERSION); | |
106 | ||
107 | ret = tps6507x_read_u8(tsc, TPS6507X_REG_ADRESULT_2, &result); | |
108 | if (ret) { | |
109 | dev_err(tsc->dev, "ADC result 2 read failed\n"); | |
110 | goto err; | |
111 | } | |
112 | ||
113 | *value = (result & TPS6507X_REG_ADRESULT_2_MASK) << 8; | |
114 | ||
115 | ret = tps6507x_read_u8(tsc, TPS6507X_REG_ADRESULT_1, &result); | |
116 | if (ret) { | |
117 | dev_err(tsc->dev, "ADC result 1 read failed\n"); | |
118 | goto err; | |
119 | } | |
120 | ||
121 | *value |= result; | |
122 | ||
123 | dev_dbg(tsc->dev, "TSC channel %d = 0x%X\n", tsc_mode, *value); | |
124 | ||
125 | err: | |
126 | return ret; | |
127 | } | |
128 | ||
129 | /* Need to call tps6507x_adc_standby() after using A/D converter for the | |
130 | * touch screen interrupt to work properly. | |
131 | */ | |
132 | ||
133 | static s32 tps6507x_adc_standby(struct tps6507x_ts *tsc) | |
134 | { | |
135 | s32 ret; | |
136 | s32 loops = 0; | |
137 | u8 val; | |
138 | ||
139 | ret = tps6507x_write_u8(tsc, TPS6507X_REG_ADCONFIG, | |
140 | TPS6507X_ADCONFIG_INPUT_TSC); | |
141 | if (ret) | |
142 | return ret; | |
143 | ||
144 | ret = tps6507x_write_u8(tsc, TPS6507X_REG_TSCMODE, | |
145 | TPS6507X_TSCMODE_STANDBY); | |
146 | if (ret) | |
147 | return ret; | |
148 | ||
149 | ret = tps6507x_read_u8(tsc, TPS6507X_REG_INT, &val); | |
150 | if (ret) | |
151 | return ret; | |
152 | ||
153 | while (val & TPS6507X_REG_TSC_INT) { | |
154 | mdelay(10); | |
155 | ret = tps6507x_read_u8(tsc, TPS6507X_REG_INT, &val); | |
156 | if (ret) | |
157 | return ret; | |
158 | loops++; | |
159 | } | |
160 | ||
161 | return ret; | |
162 | } | |
163 | ||
164 | static void tps6507x_ts_handler(struct work_struct *work) | |
165 | { | |
166 | struct tps6507x_ts *tsc = container_of(work, | |
167 | struct tps6507x_ts, work.work); | |
168 | struct input_dev *input_dev = tsc->input_dev; | |
169 | int pendown; | |
170 | int schd; | |
171 | int poll = 0; | |
172 | s32 ret; | |
173 | ||
174 | ret = tps6507x_adc_conversion(tsc, TPS6507X_TSCMODE_PRESSURE, | |
175 | &tsc->tc.pressure); | |
176 | if (ret) | |
177 | goto done; | |
178 | ||
179 | pendown = tsc->tc.pressure > tsc->min_pressure; | |
180 | ||
181 | if (unlikely(!pendown && tsc->pendown)) { | |
182 | dev_dbg(tsc->dev, "UP\n"); | |
183 | input_report_key(input_dev, BTN_TOUCH, 0); | |
184 | input_report_abs(input_dev, ABS_PRESSURE, 0); | |
185 | input_sync(input_dev); | |
186 | tsc->pendown = 0; | |
187 | } | |
188 | ||
189 | if (pendown) { | |
190 | ||
191 | if (!tsc->pendown) { | |
192 | dev_dbg(tsc->dev, "DOWN\n"); | |
193 | input_report_key(input_dev, BTN_TOUCH, 1); | |
194 | } else | |
195 | dev_dbg(tsc->dev, "still down\n"); | |
196 | ||
197 | ret = tps6507x_adc_conversion(tsc, TPS6507X_TSCMODE_X_POSITION, | |
198 | &tsc->tc.x); | |
199 | if (ret) | |
200 | goto done; | |
201 | ||
202 | ret = tps6507x_adc_conversion(tsc, TPS6507X_TSCMODE_Y_POSITION, | |
203 | &tsc->tc.y); | |
204 | if (ret) | |
205 | goto done; | |
206 | ||
207 | input_report_abs(input_dev, ABS_X, tsc->tc.x); | |
208 | input_report_abs(input_dev, ABS_Y, tsc->tc.y); | |
209 | input_report_abs(input_dev, ABS_PRESSURE, tsc->tc.pressure); | |
210 | input_sync(input_dev); | |
211 | tsc->pendown = 1; | |
212 | poll = 1; | |
213 | } | |
214 | ||
215 | done: | |
216 | /* always poll if not using interrupts */ | |
217 | poll = 1; | |
218 | ||
219 | if (poll) { | |
1c1e8646 TH |
220 | schd = schedule_delayed_work(&tsc->work, |
221 | msecs_to_jiffies(tsc->poll_period)); | |
75259966 TF |
222 | if (schd) |
223 | tsc->polling = 1; | |
224 | else { | |
225 | tsc->polling = 0; | |
226 | dev_err(tsc->dev, "re-schedule failed"); | |
227 | } | |
228 | } else | |
229 | tsc->polling = 0; | |
230 | ||
231 | ret = tps6507x_adc_standby(tsc); | |
232 | } | |
233 | ||
234 | static int tps6507x_ts_probe(struct platform_device *pdev) | |
235 | { | |
236 | int error; | |
237 | struct tps6507x_ts *tsc; | |
238 | struct tps6507x_dev *tps6507x_dev = dev_get_drvdata(pdev->dev.parent); | |
239 | struct touchscreen_init_data *init_data; | |
240 | struct input_dev *input_dev; | |
241 | struct tps6507x_board *tps_board; | |
242 | int schd; | |
243 | ||
244 | /** | |
245 | * tps_board points to pmic related constants | |
246 | * coming from the board-evm file. | |
247 | */ | |
248 | ||
249 | tps_board = (struct tps6507x_board *)tps6507x_dev->dev->platform_data; | |
250 | ||
251 | if (!tps_board) { | |
252 | dev_err(tps6507x_dev->dev, | |
253 | "Could not find tps6507x platform data\n"); | |
254 | return -EIO; | |
255 | } | |
256 | ||
257 | /** | |
258 | * init_data points to array of regulator_init structures | |
259 | * coming from the board-evm file. | |
260 | */ | |
261 | ||
262 | init_data = tps_board->tps6507x_ts_init_data; | |
263 | ||
264 | tsc = kzalloc(sizeof(struct tps6507x_ts), GFP_KERNEL); | |
265 | if (!tsc) { | |
266 | dev_err(tps6507x_dev->dev, "failed to allocate driver data\n"); | |
267 | error = -ENOMEM; | |
268 | goto err0; | |
269 | } | |
270 | ||
271 | tps6507x_dev->ts = tsc; | |
272 | tsc->mfd = tps6507x_dev; | |
273 | tsc->dev = tps6507x_dev->dev; | |
274 | input_dev = input_allocate_device(); | |
275 | if (!input_dev) { | |
276 | dev_err(tsc->dev, "Failed to allocate input device.\n"); | |
277 | error = -ENOMEM; | |
278 | goto err1; | |
279 | } | |
280 | ||
281 | input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS); | |
282 | input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH); | |
283 | ||
284 | input_set_abs_params(input_dev, ABS_X, 0, MAX_10BIT, 0, 0); | |
285 | input_set_abs_params(input_dev, ABS_Y, 0, MAX_10BIT, 0, 0); | |
286 | input_set_abs_params(input_dev, ABS_PRESSURE, 0, MAX_10BIT, 0, 0); | |
287 | ||
288 | input_dev->name = "TPS6507x Touchscreen"; | |
289 | input_dev->id.bustype = BUS_I2C; | |
290 | input_dev->dev.parent = tsc->dev; | |
291 | ||
292 | snprintf(tsc->phys, sizeof(tsc->phys), | |
293 | "%s/input0", dev_name(tsc->dev)); | |
294 | input_dev->phys = tsc->phys; | |
295 | ||
296 | dev_dbg(tsc->dev, "device: %s\n", input_dev->phys); | |
297 | ||
298 | input_set_drvdata(input_dev, tsc); | |
299 | ||
300 | tsc->input_dev = input_dev; | |
301 | ||
302 | INIT_DELAYED_WORK(&tsc->work, tps6507x_ts_handler); | |
75259966 TF |
303 | |
304 | if (init_data) { | |
305 | tsc->poll_period = init_data->poll_period; | |
306 | tsc->vref = init_data->vref; | |
307 | tsc->min_pressure = init_data->min_pressure; | |
308 | input_dev->id.vendor = init_data->vendor; | |
309 | input_dev->id.product = init_data->product; | |
310 | input_dev->id.version = init_data->version; | |
311 | } else { | |
312 | tsc->poll_period = TSC_DEFAULT_POLL_PERIOD; | |
313 | tsc->min_pressure = TPS_DEFAULT_MIN_PRESSURE; | |
314 | } | |
315 | ||
316 | error = tps6507x_adc_standby(tsc); | |
317 | if (error) | |
318 | goto err2; | |
319 | ||
320 | error = input_register_device(input_dev); | |
321 | if (error) | |
322 | goto err2; | |
323 | ||
1c1e8646 TH |
324 | schd = schedule_delayed_work(&tsc->work, |
325 | msecs_to_jiffies(tsc->poll_period)); | |
75259966 TF |
326 | |
327 | if (schd) | |
328 | tsc->polling = 1; | |
329 | else { | |
330 | tsc->polling = 0; | |
331 | dev_err(tsc->dev, "schedule failed"); | |
332 | goto err2; | |
333 | } | |
98417884 | 334 | platform_set_drvdata(pdev, tps6507x_dev); |
75259966 TF |
335 | |
336 | return 0; | |
337 | ||
338 | err2: | |
f7a2e302 | 339 | cancel_delayed_work_sync(&tsc->work); |
75259966 TF |
340 | input_free_device(input_dev); |
341 | err1: | |
342 | kfree(tsc); | |
343 | tps6507x_dev->ts = NULL; | |
344 | err0: | |
345 | return error; | |
346 | } | |
347 | ||
348 | static int __devexit tps6507x_ts_remove(struct platform_device *pdev) | |
349 | { | |
350 | struct tps6507x_dev *tps6507x_dev = platform_get_drvdata(pdev); | |
351 | struct tps6507x_ts *tsc = tps6507x_dev->ts; | |
352 | struct input_dev *input_dev = tsc->input_dev; | |
353 | ||
f7a2e302 | 354 | cancel_delayed_work_sync(&tsc->work); |
75259966 | 355 | |
8a26f5d1 | 356 | input_unregister_device(input_dev); |
75259966 TF |
357 | |
358 | tps6507x_dev->ts = NULL; | |
359 | kfree(tsc); | |
360 | ||
361 | return 0; | |
362 | } | |
363 | ||
364 | static struct platform_driver tps6507x_ts_driver = { | |
365 | .driver = { | |
366 | .name = "tps6507x-ts", | |
367 | .owner = THIS_MODULE, | |
368 | }, | |
369 | .probe = tps6507x_ts_probe, | |
1cb0aa88 | 370 | .remove = tps6507x_ts_remove, |
75259966 | 371 | }; |
cdcc96e2 | 372 | module_platform_driver(tps6507x_ts_driver); |
75259966 TF |
373 | |
374 | MODULE_AUTHOR("Todd Fischer <todd.fischer@ridgerun.com>"); | |
375 | MODULE_DESCRIPTION("TPS6507x - TouchScreen driver"); | |
376 | MODULE_LICENSE("GPL v2"); | |
79026ff2 | 377 | MODULE_ALIAS("platform:tps6507x-ts"); |