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0fa6c773 CC |
1 | /* |
2 | * Texas Instruments TNETV107X Touchscreen Driver | |
3 | * | |
4 | * Copyright (C) 2010 Texas Instruments | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or | |
7 | * modify it under the terms of the GNU General Public License as | |
8 | * published by the Free Software Foundation version 2. | |
9 | * | |
10 | * This program is distributed "as is" WITHOUT ANY WARRANTY of any | |
11 | * kind, whether express or implied; without even the implied warranty | |
12 | * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | * GNU General Public License for more details. | |
14 | */ | |
15 | ||
16 | #include <linux/kernel.h> | |
ba555461 | 17 | #include <linux/err.h> |
0fa6c773 CC |
18 | #include <linux/errno.h> |
19 | #include <linux/input.h> | |
20 | #include <linux/platform_device.h> | |
21 | #include <linux/interrupt.h> | |
22 | #include <linux/slab.h> | |
23 | #include <linux/delay.h> | |
24 | #include <linux/ctype.h> | |
25 | #include <linux/io.h> | |
26 | #include <linux/clk.h> | |
27 | ||
28 | #include <mach/tnetv107x.h> | |
29 | ||
30 | #define TSC_PENUP_POLL (HZ / 5) | |
31 | #define IDLE_TIMEOUT 100 /* msec */ | |
32 | ||
33 | /* | |
34 | * The first and last samples of a touch interval are usually garbage and need | |
35 | * to be filtered out with these devices. The following definitions control | |
36 | * the number of samples skipped. | |
37 | */ | |
38 | #define TSC_HEAD_SKIP 1 | |
39 | #define TSC_TAIL_SKIP 1 | |
40 | #define TSC_SKIP (TSC_HEAD_SKIP + TSC_TAIL_SKIP + 1) | |
41 | #define TSC_SAMPLES (TSC_SKIP + 1) | |
42 | ||
43 | /* Register Offsets */ | |
44 | struct tsc_regs { | |
45 | u32 rev; | |
46 | u32 tscm; | |
47 | u32 bwcm; | |
48 | u32 swc; | |
49 | u32 adcchnl; | |
50 | u32 adcdata; | |
51 | u32 chval[4]; | |
52 | }; | |
53 | ||
54 | /* TSC Mode Configuration Register (tscm) bits */ | |
55 | #define WMODE BIT(0) | |
56 | #define TSKIND BIT(1) | |
57 | #define ZMEASURE_EN BIT(2) | |
58 | #define IDLE BIT(3) | |
59 | #define TSC_EN BIT(4) | |
60 | #define STOP BIT(5) | |
61 | #define ONE_SHOT BIT(6) | |
62 | #define SINGLE BIT(7) | |
63 | #define AVG BIT(8) | |
64 | #define AVGNUM(x) (((x) & 0x03) << 9) | |
65 | #define PVSTC(x) (((x) & 0x07) << 11) | |
66 | #define PON BIT(14) | |
67 | #define PONBG BIT(15) | |
68 | #define AFERST BIT(16) | |
69 | ||
70 | /* ADC DATA Capture Register bits */ | |
71 | #define DATA_VALID BIT(16) | |
72 | ||
73 | /* Register Access Macros */ | |
74 | #define tsc_read(ts, reg) __raw_readl(&(ts)->regs->reg) | |
75 | #define tsc_write(ts, reg, val) __raw_writel(val, &(ts)->regs->reg); | |
76 | #define tsc_set_bits(ts, reg, val) \ | |
77 | tsc_write(ts, reg, tsc_read(ts, reg) | (val)) | |
78 | #define tsc_clr_bits(ts, reg, val) \ | |
79 | tsc_write(ts, reg, tsc_read(ts, reg) & ~(val)) | |
80 | ||
81 | struct sample { | |
82 | int x, y, p; | |
83 | }; | |
84 | ||
85 | struct tsc_data { | |
86 | struct input_dev *input_dev; | |
87 | struct resource *res; | |
88 | struct tsc_regs __iomem *regs; | |
89 | struct timer_list timer; | |
90 | spinlock_t lock; | |
91 | struct clk *clk; | |
92 | struct device *dev; | |
93 | int sample_count; | |
94 | struct sample samples[TSC_SAMPLES]; | |
95 | int tsc_irq; | |
96 | }; | |
97 | ||
98 | static int tsc_read_sample(struct tsc_data *ts, struct sample* sample) | |
99 | { | |
100 | int x, y, z1, z2, t, p = 0; | |
101 | u32 val; | |
102 | ||
103 | val = tsc_read(ts, chval[0]); | |
104 | if (val & DATA_VALID) | |
105 | x = val & 0xffff; | |
106 | else | |
107 | return -EINVAL; | |
108 | ||
109 | y = tsc_read(ts, chval[1]) & 0xffff; | |
110 | z1 = tsc_read(ts, chval[2]) & 0xffff; | |
111 | z2 = tsc_read(ts, chval[3]) & 0xffff; | |
112 | ||
113 | if (z1) { | |
114 | t = ((600 * x) * (z2 - z1)); | |
115 | p = t / (u32) (z1 << 12); | |
116 | if (p < 0) | |
117 | p = 0; | |
118 | } | |
119 | ||
120 | sample->x = x; | |
121 | sample->y = y; | |
122 | sample->p = p; | |
123 | ||
124 | return 0; | |
125 | } | |
126 | ||
127 | static void tsc_poll(unsigned long data) | |
128 | { | |
129 | struct tsc_data *ts = (struct tsc_data *)data; | |
130 | unsigned long flags; | |
131 | int i, val, x, y, p; | |
132 | ||
133 | spin_lock_irqsave(&ts->lock, flags); | |
134 | ||
135 | if (ts->sample_count >= TSC_SKIP) { | |
136 | input_report_abs(ts->input_dev, ABS_PRESSURE, 0); | |
137 | input_report_key(ts->input_dev, BTN_TOUCH, 0); | |
138 | input_sync(ts->input_dev); | |
139 | } else if (ts->sample_count > 0) { | |
140 | /* | |
141 | * A touch event lasted less than our skip count. Salvage and | |
142 | * report anyway. | |
143 | */ | |
144 | for (i = 0, val = 0; i < ts->sample_count; i++) | |
145 | val += ts->samples[i].x; | |
146 | x = val / ts->sample_count; | |
147 | ||
148 | for (i = 0, val = 0; i < ts->sample_count; i++) | |
149 | val += ts->samples[i].y; | |
150 | y = val / ts->sample_count; | |
151 | ||
152 | for (i = 0, val = 0; i < ts->sample_count; i++) | |
153 | val += ts->samples[i].p; | |
154 | p = val / ts->sample_count; | |
155 | ||
156 | input_report_abs(ts->input_dev, ABS_X, x); | |
157 | input_report_abs(ts->input_dev, ABS_Y, y); | |
158 | input_report_abs(ts->input_dev, ABS_PRESSURE, p); | |
159 | input_report_key(ts->input_dev, BTN_TOUCH, 1); | |
160 | input_sync(ts->input_dev); | |
161 | } | |
162 | ||
163 | ts->sample_count = 0; | |
164 | ||
165 | spin_unlock_irqrestore(&ts->lock, flags); | |
166 | } | |
167 | ||
168 | static irqreturn_t tsc_irq(int irq, void *dev_id) | |
169 | { | |
170 | struct tsc_data *ts = (struct tsc_data *)dev_id; | |
171 | struct sample *sample; | |
172 | int index; | |
173 | ||
174 | spin_lock(&ts->lock); | |
175 | ||
176 | index = ts->sample_count % TSC_SAMPLES; | |
177 | sample = &ts->samples[index]; | |
178 | if (tsc_read_sample(ts, sample) < 0) | |
179 | goto out; | |
180 | ||
181 | if (++ts->sample_count >= TSC_SKIP) { | |
182 | index = (ts->sample_count - TSC_TAIL_SKIP - 1) % TSC_SAMPLES; | |
183 | sample = &ts->samples[index]; | |
184 | ||
185 | input_report_abs(ts->input_dev, ABS_X, sample->x); | |
186 | input_report_abs(ts->input_dev, ABS_Y, sample->y); | |
187 | input_report_abs(ts->input_dev, ABS_PRESSURE, sample->p); | |
188 | if (ts->sample_count == TSC_SKIP) | |
189 | input_report_key(ts->input_dev, BTN_TOUCH, 1); | |
190 | input_sync(ts->input_dev); | |
191 | } | |
192 | mod_timer(&ts->timer, jiffies + TSC_PENUP_POLL); | |
193 | out: | |
194 | spin_unlock(&ts->lock); | |
195 | return IRQ_HANDLED; | |
196 | } | |
197 | ||
198 | static int tsc_start(struct input_dev *dev) | |
199 | { | |
200 | struct tsc_data *ts = input_get_drvdata(dev); | |
201 | unsigned long timeout = jiffies + msecs_to_jiffies(IDLE_TIMEOUT); | |
202 | u32 val; | |
203 | ||
204 | clk_enable(ts->clk); | |
205 | ||
206 | /* Go to idle mode, before any initialization */ | |
207 | while (time_after(timeout, jiffies)) { | |
208 | if (tsc_read(ts, tscm) & IDLE) | |
209 | break; | |
210 | } | |
211 | ||
212 | if (time_before(timeout, jiffies)) { | |
213 | dev_warn(ts->dev, "timeout waiting for idle\n"); | |
214 | clk_disable(ts->clk); | |
215 | return -EIO; | |
216 | } | |
217 | ||
218 | /* Configure TSC Control register*/ | |
219 | val = (PONBG | PON | PVSTC(4) | ONE_SHOT | ZMEASURE_EN); | |
220 | tsc_write(ts, tscm, val); | |
221 | ||
222 | /* Bring TSC out of reset: Clear AFE reset bit */ | |
223 | val &= ~(AFERST); | |
224 | tsc_write(ts, tscm, val); | |
225 | ||
226 | /* Configure all pins for hardware control*/ | |
227 | tsc_write(ts, bwcm, 0); | |
228 | ||
229 | /* Finally enable the TSC */ | |
230 | tsc_set_bits(ts, tscm, TSC_EN); | |
231 | ||
232 | return 0; | |
233 | } | |
234 | ||
235 | static void tsc_stop(struct input_dev *dev) | |
236 | { | |
237 | struct tsc_data *ts = input_get_drvdata(dev); | |
238 | ||
239 | tsc_clr_bits(ts, tscm, TSC_EN); | |
240 | synchronize_irq(ts->tsc_irq); | |
241 | del_timer_sync(&ts->timer); | |
242 | clk_disable(ts->clk); | |
243 | } | |
244 | ||
245 | static int __devinit tsc_probe(struct platform_device *pdev) | |
246 | { | |
247 | struct device *dev = &pdev->dev; | |
248 | struct tsc_data *ts; | |
249 | int error = 0; | |
250 | u32 rev = 0; | |
251 | ||
252 | ts = kzalloc(sizeof(struct tsc_data), GFP_KERNEL); | |
253 | if (!ts) { | |
254 | dev_err(dev, "cannot allocate device info\n"); | |
255 | return -ENOMEM; | |
256 | } | |
257 | ||
258 | ts->dev = dev; | |
259 | spin_lock_init(&ts->lock); | |
260 | setup_timer(&ts->timer, tsc_poll, (unsigned long)ts); | |
261 | platform_set_drvdata(pdev, ts); | |
262 | ||
263 | ts->tsc_irq = platform_get_irq(pdev, 0); | |
264 | if (ts->tsc_irq < 0) { | |
265 | dev_err(dev, "cannot determine device interrupt\n"); | |
266 | error = -ENODEV; | |
267 | goto error_res; | |
268 | } | |
269 | ||
270 | ts->res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
271 | if (!ts->res) { | |
272 | dev_err(dev, "cannot determine register area\n"); | |
273 | error = -ENODEV; | |
274 | goto error_res; | |
275 | } | |
276 | ||
277 | if (!request_mem_region(ts->res->start, resource_size(ts->res), | |
278 | pdev->name)) { | |
279 | dev_err(dev, "cannot claim register memory\n"); | |
280 | ts->res = NULL; | |
281 | error = -EINVAL; | |
282 | goto error_res; | |
283 | } | |
284 | ||
285 | ts->regs = ioremap(ts->res->start, resource_size(ts->res)); | |
286 | if (!ts->regs) { | |
287 | dev_err(dev, "cannot map register memory\n"); | |
288 | error = -ENOMEM; | |
289 | goto error_map; | |
290 | } | |
291 | ||
292 | ts->clk = clk_get(dev, NULL); | |
ba555461 | 293 | if (IS_ERR(ts->clk)) { |
0fa6c773 | 294 | dev_err(dev, "cannot claim device clock\n"); |
ba555461 | 295 | error = PTR_ERR(ts->clk); |
0fa6c773 CC |
296 | goto error_clk; |
297 | } | |
298 | ||
299 | error = request_threaded_irq(ts->tsc_irq, NULL, tsc_irq, 0, | |
300 | dev_name(dev), ts); | |
301 | if (error < 0) { | |
302 | dev_err(ts->dev, "Could not allocate ts irq\n"); | |
303 | goto error_irq; | |
304 | } | |
305 | ||
306 | ts->input_dev = input_allocate_device(); | |
307 | if (!ts->input_dev) { | |
308 | dev_err(dev, "cannot allocate input device\n"); | |
309 | error = -ENOMEM; | |
310 | goto error_input; | |
311 | } | |
312 | input_set_drvdata(ts->input_dev, ts); | |
313 | ||
314 | ts->input_dev->name = pdev->name; | |
315 | ts->input_dev->id.bustype = BUS_HOST; | |
316 | ts->input_dev->dev.parent = &pdev->dev; | |
317 | ts->input_dev->open = tsc_start; | |
318 | ts->input_dev->close = tsc_stop; | |
319 | ||
320 | clk_enable(ts->clk); | |
321 | rev = tsc_read(ts, rev); | |
322 | ts->input_dev->id.product = ((rev >> 8) & 0x07); | |
323 | ts->input_dev->id.version = ((rev >> 16) & 0xfff); | |
324 | clk_disable(ts->clk); | |
325 | ||
326 | __set_bit(EV_KEY, ts->input_dev->evbit); | |
327 | __set_bit(EV_ABS, ts->input_dev->evbit); | |
328 | __set_bit(BTN_TOUCH, ts->input_dev->keybit); | |
329 | ||
330 | input_set_abs_params(ts->input_dev, ABS_X, 0, 0xffff, 5, 0); | |
331 | input_set_abs_params(ts->input_dev, ABS_Y, 0, 0xffff, 5, 0); | |
332 | input_set_abs_params(ts->input_dev, ABS_PRESSURE, 0, 4095, 128, 0); | |
333 | ||
334 | error = input_register_device(ts->input_dev); | |
335 | if (error < 0) { | |
336 | dev_err(dev, "failed input device registration\n"); | |
337 | goto error_reg; | |
338 | } | |
339 | ||
340 | return 0; | |
341 | ||
342 | error_reg: | |
343 | input_free_device(ts->input_dev); | |
344 | error_input: | |
345 | free_irq(ts->tsc_irq, ts); | |
346 | error_irq: | |
347 | clk_put(ts->clk); | |
348 | error_clk: | |
349 | iounmap(ts->regs); | |
350 | error_map: | |
351 | release_mem_region(ts->res->start, resource_size(ts->res)); | |
352 | error_res: | |
353 | platform_set_drvdata(pdev, NULL); | |
354 | kfree(ts); | |
355 | ||
356 | return error; | |
357 | } | |
358 | ||
359 | static int __devexit tsc_remove(struct platform_device *pdev) | |
360 | { | |
361 | struct tsc_data *ts = platform_get_drvdata(pdev); | |
362 | ||
363 | input_unregister_device(ts->input_dev); | |
364 | free_irq(ts->tsc_irq, ts); | |
365 | clk_put(ts->clk); | |
366 | iounmap(ts->regs); | |
367 | release_mem_region(ts->res->start, resource_size(ts->res)); | |
368 | platform_set_drvdata(pdev, NULL); | |
369 | kfree(ts); | |
370 | ||
371 | return 0; | |
372 | } | |
373 | ||
374 | static struct platform_driver tsc_driver = { | |
375 | .probe = tsc_probe, | |
376 | .remove = __devexit_p(tsc_remove), | |
377 | .driver.name = "tnetv107x-ts", | |
378 | .driver.owner = THIS_MODULE, | |
379 | }; | |
380 | ||
381 | static int __init tsc_init(void) | |
382 | { | |
383 | return platform_driver_register(&tsc_driver); | |
384 | } | |
385 | ||
386 | static void __exit tsc_exit(void) | |
387 | { | |
388 | platform_driver_unregister(&tsc_driver); | |
389 | } | |
390 | ||
391 | module_init(tsc_init); | |
392 | module_exit(tsc_exit); | |
393 | ||
394 | MODULE_AUTHOR("Cyril Chemparathy"); | |
395 | MODULE_DESCRIPTION("TNETV107X Touchscreen Driver"); | |
6a592a7f | 396 | MODULE_ALIAS("platform:tnetv107x-ts"); |
0fa6c773 | 397 | MODULE_LICENSE("GPL"); |