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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 | ||
2782a351 | 16 | #include <linux/module.h> |
0fa6c773 | 17 | #include <linux/kernel.h> |
ba555461 | 18 | #include <linux/err.h> |
0fa6c773 CC |
19 | #include <linux/errno.h> |
20 | #include <linux/input.h> | |
21 | #include <linux/platform_device.h> | |
22 | #include <linux/interrupt.h> | |
23 | #include <linux/slab.h> | |
24 | #include <linux/delay.h> | |
25 | #include <linux/ctype.h> | |
26 | #include <linux/io.h> | |
27 | #include <linux/clk.h> | |
28 | ||
29 | #include <mach/tnetv107x.h> | |
30 | ||
31 | #define TSC_PENUP_POLL (HZ / 5) | |
32 | #define IDLE_TIMEOUT 100 /* msec */ | |
33 | ||
34 | /* | |
35 | * The first and last samples of a touch interval are usually garbage and need | |
36 | * to be filtered out with these devices. The following definitions control | |
37 | * the number of samples skipped. | |
38 | */ | |
39 | #define TSC_HEAD_SKIP 1 | |
40 | #define TSC_TAIL_SKIP 1 | |
41 | #define TSC_SKIP (TSC_HEAD_SKIP + TSC_TAIL_SKIP + 1) | |
42 | #define TSC_SAMPLES (TSC_SKIP + 1) | |
43 | ||
44 | /* Register Offsets */ | |
45 | struct tsc_regs { | |
46 | u32 rev; | |
47 | u32 tscm; | |
48 | u32 bwcm; | |
49 | u32 swc; | |
50 | u32 adcchnl; | |
51 | u32 adcdata; | |
52 | u32 chval[4]; | |
53 | }; | |
54 | ||
55 | /* TSC Mode Configuration Register (tscm) bits */ | |
56 | #define WMODE BIT(0) | |
57 | #define TSKIND BIT(1) | |
58 | #define ZMEASURE_EN BIT(2) | |
59 | #define IDLE BIT(3) | |
60 | #define TSC_EN BIT(4) | |
61 | #define STOP BIT(5) | |
62 | #define ONE_SHOT BIT(6) | |
63 | #define SINGLE BIT(7) | |
64 | #define AVG BIT(8) | |
65 | #define AVGNUM(x) (((x) & 0x03) << 9) | |
66 | #define PVSTC(x) (((x) & 0x07) << 11) | |
67 | #define PON BIT(14) | |
68 | #define PONBG BIT(15) | |
69 | #define AFERST BIT(16) | |
70 | ||
71 | /* ADC DATA Capture Register bits */ | |
72 | #define DATA_VALID BIT(16) | |
73 | ||
74 | /* Register Access Macros */ | |
75 | #define tsc_read(ts, reg) __raw_readl(&(ts)->regs->reg) | |
76 | #define tsc_write(ts, reg, val) __raw_writel(val, &(ts)->regs->reg); | |
77 | #define tsc_set_bits(ts, reg, val) \ | |
78 | tsc_write(ts, reg, tsc_read(ts, reg) | (val)) | |
79 | #define tsc_clr_bits(ts, reg, val) \ | |
80 | tsc_write(ts, reg, tsc_read(ts, reg) & ~(val)) | |
81 | ||
82 | struct sample { | |
83 | int x, y, p; | |
84 | }; | |
85 | ||
86 | struct tsc_data { | |
87 | struct input_dev *input_dev; | |
88 | struct resource *res; | |
89 | struct tsc_regs __iomem *regs; | |
90 | struct timer_list timer; | |
91 | spinlock_t lock; | |
92 | struct clk *clk; | |
93 | struct device *dev; | |
94 | int sample_count; | |
95 | struct sample samples[TSC_SAMPLES]; | |
96 | int tsc_irq; | |
97 | }; | |
98 | ||
99 | static int tsc_read_sample(struct tsc_data *ts, struct sample* sample) | |
100 | { | |
101 | int x, y, z1, z2, t, p = 0; | |
102 | u32 val; | |
103 | ||
104 | val = tsc_read(ts, chval[0]); | |
105 | if (val & DATA_VALID) | |
106 | x = val & 0xffff; | |
107 | else | |
108 | return -EINVAL; | |
109 | ||
110 | y = tsc_read(ts, chval[1]) & 0xffff; | |
111 | z1 = tsc_read(ts, chval[2]) & 0xffff; | |
112 | z2 = tsc_read(ts, chval[3]) & 0xffff; | |
113 | ||
114 | if (z1) { | |
115 | t = ((600 * x) * (z2 - z1)); | |
116 | p = t / (u32) (z1 << 12); | |
117 | if (p < 0) | |
118 | p = 0; | |
119 | } | |
120 | ||
121 | sample->x = x; | |
122 | sample->y = y; | |
123 | sample->p = p; | |
124 | ||
125 | return 0; | |
126 | } | |
127 | ||
128 | static void tsc_poll(unsigned long data) | |
129 | { | |
130 | struct tsc_data *ts = (struct tsc_data *)data; | |
131 | unsigned long flags; | |
132 | int i, val, x, y, p; | |
133 | ||
134 | spin_lock_irqsave(&ts->lock, flags); | |
135 | ||
136 | if (ts->sample_count >= TSC_SKIP) { | |
137 | input_report_abs(ts->input_dev, ABS_PRESSURE, 0); | |
138 | input_report_key(ts->input_dev, BTN_TOUCH, 0); | |
139 | input_sync(ts->input_dev); | |
140 | } else if (ts->sample_count > 0) { | |
141 | /* | |
142 | * A touch event lasted less than our skip count. Salvage and | |
143 | * report anyway. | |
144 | */ | |
145 | for (i = 0, val = 0; i < ts->sample_count; i++) | |
146 | val += ts->samples[i].x; | |
147 | x = val / ts->sample_count; | |
148 | ||
149 | for (i = 0, val = 0; i < ts->sample_count; i++) | |
150 | val += ts->samples[i].y; | |
151 | y = val / ts->sample_count; | |
152 | ||
153 | for (i = 0, val = 0; i < ts->sample_count; i++) | |
154 | val += ts->samples[i].p; | |
155 | p = val / ts->sample_count; | |
156 | ||
157 | input_report_abs(ts->input_dev, ABS_X, x); | |
158 | input_report_abs(ts->input_dev, ABS_Y, y); | |
159 | input_report_abs(ts->input_dev, ABS_PRESSURE, p); | |
160 | input_report_key(ts->input_dev, BTN_TOUCH, 1); | |
161 | input_sync(ts->input_dev); | |
162 | } | |
163 | ||
164 | ts->sample_count = 0; | |
165 | ||
166 | spin_unlock_irqrestore(&ts->lock, flags); | |
167 | } | |
168 | ||
169 | static irqreturn_t tsc_irq(int irq, void *dev_id) | |
170 | { | |
171 | struct tsc_data *ts = (struct tsc_data *)dev_id; | |
172 | struct sample *sample; | |
173 | int index; | |
174 | ||
175 | spin_lock(&ts->lock); | |
176 | ||
177 | index = ts->sample_count % TSC_SAMPLES; | |
178 | sample = &ts->samples[index]; | |
179 | if (tsc_read_sample(ts, sample) < 0) | |
180 | goto out; | |
181 | ||
182 | if (++ts->sample_count >= TSC_SKIP) { | |
183 | index = (ts->sample_count - TSC_TAIL_SKIP - 1) % TSC_SAMPLES; | |
184 | sample = &ts->samples[index]; | |
185 | ||
186 | input_report_abs(ts->input_dev, ABS_X, sample->x); | |
187 | input_report_abs(ts->input_dev, ABS_Y, sample->y); | |
188 | input_report_abs(ts->input_dev, ABS_PRESSURE, sample->p); | |
189 | if (ts->sample_count == TSC_SKIP) | |
190 | input_report_key(ts->input_dev, BTN_TOUCH, 1); | |
191 | input_sync(ts->input_dev); | |
192 | } | |
193 | mod_timer(&ts->timer, jiffies + TSC_PENUP_POLL); | |
194 | out: | |
195 | spin_unlock(&ts->lock); | |
196 | return IRQ_HANDLED; | |
197 | } | |
198 | ||
199 | static int tsc_start(struct input_dev *dev) | |
200 | { | |
201 | struct tsc_data *ts = input_get_drvdata(dev); | |
202 | unsigned long timeout = jiffies + msecs_to_jiffies(IDLE_TIMEOUT); | |
203 | u32 val; | |
204 | ||
205 | clk_enable(ts->clk); | |
206 | ||
207 | /* Go to idle mode, before any initialization */ | |
208 | while (time_after(timeout, jiffies)) { | |
209 | if (tsc_read(ts, tscm) & IDLE) | |
210 | break; | |
211 | } | |
212 | ||
213 | if (time_before(timeout, jiffies)) { | |
214 | dev_warn(ts->dev, "timeout waiting for idle\n"); | |
215 | clk_disable(ts->clk); | |
216 | return -EIO; | |
217 | } | |
218 | ||
219 | /* Configure TSC Control register*/ | |
220 | val = (PONBG | PON | PVSTC(4) | ONE_SHOT | ZMEASURE_EN); | |
221 | tsc_write(ts, tscm, val); | |
222 | ||
223 | /* Bring TSC out of reset: Clear AFE reset bit */ | |
224 | val &= ~(AFERST); | |
225 | tsc_write(ts, tscm, val); | |
226 | ||
227 | /* Configure all pins for hardware control*/ | |
228 | tsc_write(ts, bwcm, 0); | |
229 | ||
230 | /* Finally enable the TSC */ | |
231 | tsc_set_bits(ts, tscm, TSC_EN); | |
232 | ||
233 | return 0; | |
234 | } | |
235 | ||
236 | static void tsc_stop(struct input_dev *dev) | |
237 | { | |
238 | struct tsc_data *ts = input_get_drvdata(dev); | |
239 | ||
240 | tsc_clr_bits(ts, tscm, TSC_EN); | |
241 | synchronize_irq(ts->tsc_irq); | |
242 | del_timer_sync(&ts->timer); | |
243 | clk_disable(ts->clk); | |
244 | } | |
245 | ||
246 | static int __devinit tsc_probe(struct platform_device *pdev) | |
247 | { | |
248 | struct device *dev = &pdev->dev; | |
249 | struct tsc_data *ts; | |
250 | int error = 0; | |
251 | u32 rev = 0; | |
252 | ||
253 | ts = kzalloc(sizeof(struct tsc_data), GFP_KERNEL); | |
254 | if (!ts) { | |
255 | dev_err(dev, "cannot allocate device info\n"); | |
256 | return -ENOMEM; | |
257 | } | |
258 | ||
259 | ts->dev = dev; | |
260 | spin_lock_init(&ts->lock); | |
261 | setup_timer(&ts->timer, tsc_poll, (unsigned long)ts); | |
262 | platform_set_drvdata(pdev, ts); | |
263 | ||
264 | ts->tsc_irq = platform_get_irq(pdev, 0); | |
265 | if (ts->tsc_irq < 0) { | |
266 | dev_err(dev, "cannot determine device interrupt\n"); | |
267 | error = -ENODEV; | |
268 | goto error_res; | |
269 | } | |
270 | ||
271 | ts->res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
272 | if (!ts->res) { | |
273 | dev_err(dev, "cannot determine register area\n"); | |
274 | error = -ENODEV; | |
275 | goto error_res; | |
276 | } | |
277 | ||
278 | if (!request_mem_region(ts->res->start, resource_size(ts->res), | |
279 | pdev->name)) { | |
280 | dev_err(dev, "cannot claim register memory\n"); | |
281 | ts->res = NULL; | |
282 | error = -EINVAL; | |
283 | goto error_res; | |
284 | } | |
285 | ||
286 | ts->regs = ioremap(ts->res->start, resource_size(ts->res)); | |
287 | if (!ts->regs) { | |
288 | dev_err(dev, "cannot map register memory\n"); | |
289 | error = -ENOMEM; | |
290 | goto error_map; | |
291 | } | |
292 | ||
293 | ts->clk = clk_get(dev, NULL); | |
ba555461 | 294 | if (IS_ERR(ts->clk)) { |
0fa6c773 | 295 | dev_err(dev, "cannot claim device clock\n"); |
ba555461 | 296 | error = PTR_ERR(ts->clk); |
0fa6c773 CC |
297 | goto error_clk; |
298 | } | |
299 | ||
9b7e31bb | 300 | error = request_threaded_irq(ts->tsc_irq, NULL, tsc_irq, IRQF_ONESHOT, |
0fa6c773 CC |
301 | dev_name(dev), ts); |
302 | if (error < 0) { | |
303 | dev_err(ts->dev, "Could not allocate ts irq\n"); | |
304 | goto error_irq; | |
305 | } | |
306 | ||
307 | ts->input_dev = input_allocate_device(); | |
308 | if (!ts->input_dev) { | |
309 | dev_err(dev, "cannot allocate input device\n"); | |
310 | error = -ENOMEM; | |
311 | goto error_input; | |
312 | } | |
313 | input_set_drvdata(ts->input_dev, ts); | |
314 | ||
315 | ts->input_dev->name = pdev->name; | |
316 | ts->input_dev->id.bustype = BUS_HOST; | |
317 | ts->input_dev->dev.parent = &pdev->dev; | |
318 | ts->input_dev->open = tsc_start; | |
319 | ts->input_dev->close = tsc_stop; | |
320 | ||
321 | clk_enable(ts->clk); | |
322 | rev = tsc_read(ts, rev); | |
323 | ts->input_dev->id.product = ((rev >> 8) & 0x07); | |
324 | ts->input_dev->id.version = ((rev >> 16) & 0xfff); | |
325 | clk_disable(ts->clk); | |
326 | ||
327 | __set_bit(EV_KEY, ts->input_dev->evbit); | |
328 | __set_bit(EV_ABS, ts->input_dev->evbit); | |
329 | __set_bit(BTN_TOUCH, ts->input_dev->keybit); | |
330 | ||
331 | input_set_abs_params(ts->input_dev, ABS_X, 0, 0xffff, 5, 0); | |
332 | input_set_abs_params(ts->input_dev, ABS_Y, 0, 0xffff, 5, 0); | |
333 | input_set_abs_params(ts->input_dev, ABS_PRESSURE, 0, 4095, 128, 0); | |
334 | ||
335 | error = input_register_device(ts->input_dev); | |
336 | if (error < 0) { | |
337 | dev_err(dev, "failed input device registration\n"); | |
338 | goto error_reg; | |
339 | } | |
340 | ||
341 | return 0; | |
342 | ||
343 | error_reg: | |
344 | input_free_device(ts->input_dev); | |
345 | error_input: | |
346 | free_irq(ts->tsc_irq, ts); | |
347 | error_irq: | |
348 | clk_put(ts->clk); | |
349 | error_clk: | |
350 | iounmap(ts->regs); | |
351 | error_map: | |
352 | release_mem_region(ts->res->start, resource_size(ts->res)); | |
353 | error_res: | |
354 | platform_set_drvdata(pdev, NULL); | |
355 | kfree(ts); | |
356 | ||
357 | return error; | |
358 | } | |
359 | ||
360 | static int __devexit tsc_remove(struct platform_device *pdev) | |
361 | { | |
362 | struct tsc_data *ts = platform_get_drvdata(pdev); | |
363 | ||
364 | input_unregister_device(ts->input_dev); | |
365 | free_irq(ts->tsc_irq, ts); | |
366 | clk_put(ts->clk); | |
367 | iounmap(ts->regs); | |
368 | release_mem_region(ts->res->start, resource_size(ts->res)); | |
369 | platform_set_drvdata(pdev, NULL); | |
370 | kfree(ts); | |
371 | ||
372 | return 0; | |
373 | } | |
374 | ||
375 | static struct platform_driver tsc_driver = { | |
376 | .probe = tsc_probe, | |
377 | .remove = __devexit_p(tsc_remove), | |
378 | .driver.name = "tnetv107x-ts", | |
379 | .driver.owner = THIS_MODULE, | |
380 | }; | |
cdcc96e2 | 381 | module_platform_driver(tsc_driver); |
0fa6c773 CC |
382 | |
383 | MODULE_AUTHOR("Cyril Chemparathy"); | |
384 | MODULE_DESCRIPTION("TNETV107X Touchscreen Driver"); | |
6a592a7f | 385 | MODULE_ALIAS("platform:tnetv107x-ts"); |
0fa6c773 | 386 | MODULE_LICENSE("GPL"); |