Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /* |
513b6e1a | 2 | * Touchscreen driver for Sharp SL-C7xx and SL-Cxx00 models |
1da177e4 LT |
3 | * |
4 | * Copyright (c) 2004-2005 Richard Purdie | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License version 2 as | |
8 | * published by the Free Software Foundation. | |
9 | * | |
10 | */ | |
11 | ||
12 | ||
13 | #include <linux/delay.h> | |
d052d1be | 14 | #include <linux/platform_device.h> |
1da177e4 LT |
15 | #include <linux/init.h> |
16 | #include <linux/input.h> | |
17 | #include <linux/interrupt.h> | |
18 | #include <linux/module.h> | |
19 | #include <linux/slab.h> | |
e6e3c3be | 20 | #include <linux/irq.h> |
1da177e4 | 21 | |
513b6e1a | 22 | #include <asm/arch/sharpsl.h> |
1da177e4 LT |
23 | #include <asm/arch/hardware.h> |
24 | #include <asm/arch/pxa-regs.h> | |
a683b14d | 25 | #include <asm/arch/pxa2xx-gpio.h> |
1da177e4 LT |
26 | |
27 | ||
28 | #define PWR_MODE_ACTIVE 0 | |
29 | #define PWR_MODE_SUSPEND 1 | |
30 | ||
31 | #define X_AXIS_MAX 3830 | |
32 | #define X_AXIS_MIN 150 | |
33 | #define Y_AXIS_MAX 3830 | |
34 | #define Y_AXIS_MIN 190 | |
35 | #define PRESSURE_MIN 0 | |
36 | #define PRESSURE_MAX 15000 | |
37 | ||
38 | struct ts_event { | |
39 | short pressure; | |
40 | short x; | |
41 | short y; | |
42 | }; | |
43 | ||
44 | struct corgi_ts { | |
eca1ed19 | 45 | struct input_dev *input; |
1da177e4 LT |
46 | struct timer_list timer; |
47 | struct ts_event tc; | |
48 | int pendown; | |
49 | int power_mode; | |
513b6e1a RP |
50 | int irq_gpio; |
51 | struct corgits_machinfo *machinfo; | |
1da177e4 LT |
52 | }; |
53 | ||
513b6e1a | 54 | #ifdef CONFIG_PXA25x |
1da177e4 | 55 | #define CCNT(a) asm volatile ("mrc p14, 0, %0, C1, C0, 0" : "=r"(a)) |
347e4843 RP |
56 | #define PMNC_GET(x) asm volatile ("mrc p14, 0, %0, C0, C0, 0" : "=r"(x)) |
57 | #define PMNC_SET(x) asm volatile ("mcr p14, 0, %0, C0, C0, 0" : : "r"(x)) | |
513b6e1a RP |
58 | #endif |
59 | #ifdef CONFIG_PXA27x | |
60 | #define CCNT(a) asm volatile ("mrc p14, 0, %0, C1, C1, 0" : "=r"(a)) | |
61 | #define PMNC_GET(x) asm volatile ("mrc p14, 0, %0, C0, C1, 0" : "=r"(x)) | |
62 | #define PMNC_SET(x) asm volatile ("mcr p14, 0, %0, C0, C1, 0" : : "r"(x)) | |
63 | #endif | |
1da177e4 LT |
64 | |
65 | /* ADS7846 Touch Screen Controller bit definitions */ | |
66 | #define ADSCTRL_PD0 (1u << 0) /* PD0 */ | |
67 | #define ADSCTRL_PD1 (1u << 1) /* PD1 */ | |
68 | #define ADSCTRL_DFR (1u << 2) /* SER/DFR */ | |
69 | #define ADSCTRL_MOD (1u << 3) /* Mode */ | |
70 | #define ADSCTRL_ADR_SH 4 /* Address setting */ | |
71 | #define ADSCTRL_STS (1u << 7) /* Start Bit */ | |
72 | ||
73 | /* External Functions */ | |
1da177e4 LT |
74 | extern unsigned int get_clk_frequency_khz(int info); |
75 | ||
513b6e1a | 76 | static unsigned long calc_waittime(struct corgi_ts *corgi_ts) |
1da177e4 | 77 | { |
ca4d6cfc | 78 | unsigned long hsync_invperiod = corgi_ts->machinfo->get_hsync_invperiod(); |
1da177e4 | 79 | |
ca4d6cfc RP |
80 | if (hsync_invperiod) |
81 | return get_clk_frequency_khz(0)*1000/hsync_invperiod; | |
41b1bce8 | 82 | else |
74b74890 | 83 | return 0; |
1da177e4 LT |
84 | } |
85 | ||
513b6e1a RP |
86 | static int sync_receive_data_send_cmd(struct corgi_ts *corgi_ts, int doRecive, int doSend, |
87 | unsigned int address, unsigned long wait_time) | |
1da177e4 | 88 | { |
347e4843 | 89 | unsigned long timer1 = 0, timer2, pmnc = 0; |
1da177e4 | 90 | int pos = 0; |
1da177e4 | 91 | |
74b74890 | 92 | if (wait_time && doSend) { |
347e4843 RP |
93 | PMNC_GET(pmnc); |
94 | if (!(pmnc & 0x01)) | |
8cc3c7af | 95 | PMNC_SET(0x01); |
347e4843 | 96 | |
1da177e4 | 97 | /* polling HSync */ |
513b6e1a | 98 | corgi_ts->machinfo->wait_hsync(); |
1da177e4 LT |
99 | /* get CCNT */ |
100 | CCNT(timer1); | |
101 | } | |
102 | ||
103 | if (doRecive) | |
104 | pos = corgi_ssp_ads7846_get(); | |
105 | ||
106 | if (doSend) { | |
107 | int cmd = ADSCTRL_PD0 | ADSCTRL_PD1 | (address << ADSCTRL_ADR_SH) | ADSCTRL_STS; | |
108 | /* dummy command */ | |
109 | corgi_ssp_ads7846_put(cmd); | |
110 | corgi_ssp_ads7846_get(); | |
111 | ||
74b74890 | 112 | if (wait_time) { |
1da177e4 LT |
113 | /* Wait after HSync */ |
114 | CCNT(timer2); | |
115 | if (timer2-timer1 > wait_time) { | |
74b74890 | 116 | /* too slow - timeout, try again */ |
513b6e1a | 117 | corgi_ts->machinfo->wait_hsync(); |
ca4d6cfc | 118 | /* get CCNT */ |
1da177e4 LT |
119 | CCNT(timer1); |
120 | /* Wait after HSync */ | |
121 | CCNT(timer2); | |
122 | } | |
123 | while (timer2 - timer1 < wait_time) | |
124 | CCNT(timer2); | |
125 | } | |
126 | corgi_ssp_ads7846_put(cmd); | |
74b74890 | 127 | if (wait_time && !(pmnc & 0x01)) |
347e4843 | 128 | PMNC_SET(pmnc); |
1da177e4 LT |
129 | } |
130 | return pos; | |
131 | } | |
132 | ||
133 | static int read_xydata(struct corgi_ts *corgi_ts) | |
134 | { | |
135 | unsigned int x, y, z1, z2; | |
136 | unsigned long flags, wait_time; | |
137 | ||
138 | /* critical section */ | |
139 | local_irq_save(flags); | |
140 | corgi_ssp_ads7846_lock(); | |
513b6e1a | 141 | wait_time = calc_waittime(corgi_ts); |
1da177e4 LT |
142 | |
143 | /* Y-axis */ | |
513b6e1a | 144 | sync_receive_data_send_cmd(corgi_ts, 0, 1, 1u, wait_time); |
1da177e4 LT |
145 | |
146 | /* Y-axis */ | |
513b6e1a | 147 | sync_receive_data_send_cmd(corgi_ts, 1, 1, 1u, wait_time); |
1da177e4 LT |
148 | |
149 | /* X-axis */ | |
513b6e1a | 150 | y = sync_receive_data_send_cmd(corgi_ts, 1, 1, 5u, wait_time); |
1da177e4 LT |
151 | |
152 | /* Z1 */ | |
513b6e1a | 153 | x = sync_receive_data_send_cmd(corgi_ts, 1, 1, 3u, wait_time); |
1da177e4 LT |
154 | |
155 | /* Z2 */ | |
513b6e1a RP |
156 | z1 = sync_receive_data_send_cmd(corgi_ts, 1, 1, 4u, wait_time); |
157 | z2 = sync_receive_data_send_cmd(corgi_ts, 1, 0, 4u, wait_time); | |
1da177e4 LT |
158 | |
159 | /* Power-Down Enable */ | |
160 | corgi_ssp_ads7846_put((1u << ADSCTRL_ADR_SH) | ADSCTRL_STS); | |
161 | corgi_ssp_ads7846_get(); | |
162 | ||
163 | corgi_ssp_ads7846_unlock(); | |
164 | local_irq_restore(flags); | |
165 | ||
166 | if (x== 0 || y == 0 || z1 == 0 || (x * (z2 - z1) / z1) >= 15000) { | |
167 | corgi_ts->tc.pressure = 0; | |
168 | return 0; | |
169 | } | |
170 | ||
171 | corgi_ts->tc.x = x; | |
172 | corgi_ts->tc.y = y; | |
173 | corgi_ts->tc.pressure = (x * (z2 - z1)) / z1; | |
174 | return 1; | |
175 | } | |
176 | ||
7d12e780 | 177 | static void new_data(struct corgi_ts *corgi_ts) |
1da177e4 | 178 | { |
52c1f570 DT |
179 | struct input_dev *dev = corgi_ts->input; |
180 | ||
1da177e4 LT |
181 | if (corgi_ts->power_mode != PWR_MODE_ACTIVE) |
182 | return; | |
183 | ||
184 | if (!corgi_ts->tc.pressure && corgi_ts->pendown == 0) | |
185 | return; | |
186 | ||
52c1f570 DT |
187 | input_report_abs(dev, ABS_X, corgi_ts->tc.x); |
188 | input_report_abs(dev, ABS_Y, corgi_ts->tc.y); | |
189 | input_report_abs(dev, ABS_PRESSURE, corgi_ts->tc.pressure); | |
190 | input_report_key(dev, BTN_TOUCH, corgi_ts->pendown); | |
191 | input_sync(dev); | |
1da177e4 LT |
192 | } |
193 | ||
7d12e780 | 194 | static void ts_interrupt_main(struct corgi_ts *corgi_ts, int isTimer) |
1da177e4 | 195 | { |
513b6e1a | 196 | if ((GPLR(IRQ_TO_GPIO(corgi_ts->irq_gpio)) & GPIO_bit(IRQ_TO_GPIO(corgi_ts->irq_gpio))) == 0) { |
1da177e4 | 197 | /* Disable Interrupt */ |
6cab4860 | 198 | set_irq_type(corgi_ts->irq_gpio, IRQ_TYPE_NONE); |
1da177e4 LT |
199 | if (read_xydata(corgi_ts)) { |
200 | corgi_ts->pendown = 1; | |
7d12e780 | 201 | new_data(corgi_ts); |
1da177e4 LT |
202 | } |
203 | mod_timer(&corgi_ts->timer, jiffies + HZ / 100); | |
204 | } else { | |
205 | if (corgi_ts->pendown == 1 || corgi_ts->pendown == 2) { | |
206 | mod_timer(&corgi_ts->timer, jiffies + HZ / 100); | |
207 | corgi_ts->pendown++; | |
208 | return; | |
209 | } | |
210 | ||
211 | if (corgi_ts->pendown) { | |
212 | corgi_ts->tc.pressure = 0; | |
7d12e780 | 213 | new_data(corgi_ts); |
1da177e4 LT |
214 | } |
215 | ||
216 | /* Enable Falling Edge */ | |
6cab4860 | 217 | set_irq_type(corgi_ts->irq_gpio, IRQ_TYPE_EDGE_FALLING); |
1da177e4 LT |
218 | corgi_ts->pendown = 0; |
219 | } | |
220 | } | |
221 | ||
222 | static void corgi_ts_timer(unsigned long data) | |
223 | { | |
224 | struct corgi_ts *corgits_data = (struct corgi_ts *) data; | |
52c1f570 | 225 | |
36bd262b | 226 | ts_interrupt_main(corgits_data, 1); |
1da177e4 LT |
227 | } |
228 | ||
7d12e780 | 229 | static irqreturn_t ts_interrupt(int irq, void *dev_id) |
1da177e4 LT |
230 | { |
231 | struct corgi_ts *corgits_data = dev_id; | |
52c1f570 | 232 | |
7d12e780 | 233 | ts_interrupt_main(corgits_data, 0); |
1da177e4 LT |
234 | return IRQ_HANDLED; |
235 | } | |
236 | ||
237 | #ifdef CONFIG_PM | |
3ae5eaec | 238 | static int corgits_suspend(struct platform_device *dev, pm_message_t state) |
1da177e4 | 239 | { |
3ae5eaec | 240 | struct corgi_ts *corgi_ts = platform_get_drvdata(dev); |
1da177e4 | 241 | |
9480e307 RK |
242 | if (corgi_ts->pendown) { |
243 | del_timer_sync(&corgi_ts->timer); | |
244 | corgi_ts->tc.pressure = 0; | |
36bd262b | 245 | new_data(corgi_ts); |
9480e307 | 246 | corgi_ts->pendown = 0; |
1da177e4 | 247 | } |
9480e307 RK |
248 | corgi_ts->power_mode = PWR_MODE_SUSPEND; |
249 | ||
250 | corgi_ssp_ads7846_putget((1u << ADSCTRL_ADR_SH) | ADSCTRL_STS); | |
251 | ||
1da177e4 LT |
252 | return 0; |
253 | } | |
254 | ||
3ae5eaec | 255 | static int corgits_resume(struct platform_device *dev) |
1da177e4 | 256 | { |
3ae5eaec | 257 | struct corgi_ts *corgi_ts = platform_get_drvdata(dev); |
9480e307 RK |
258 | |
259 | corgi_ssp_ads7846_putget((4u << ADSCTRL_ADR_SH) | ADSCTRL_STS); | |
260 | /* Enable Falling Edge */ | |
6cab4860 | 261 | set_irq_type(corgi_ts->irq_gpio, IRQ_TYPE_EDGE_FALLING); |
9480e307 | 262 | corgi_ts->power_mode = PWR_MODE_ACTIVE; |
1da177e4 | 263 | |
1da177e4 LT |
264 | return 0; |
265 | } | |
266 | #else | |
267 | #define corgits_suspend NULL | |
268 | #define corgits_resume NULL | |
269 | #endif | |
270 | ||
3ae5eaec | 271 | static int __init corgits_probe(struct platform_device *pdev) |
1da177e4 LT |
272 | { |
273 | struct corgi_ts *corgi_ts; | |
eca1ed19 DT |
274 | struct input_dev *input_dev; |
275 | int err = -ENOMEM; | |
1da177e4 | 276 | |
eca1ed19 DT |
277 | corgi_ts = kzalloc(sizeof(struct corgi_ts), GFP_KERNEL); |
278 | input_dev = input_allocate_device(); | |
279 | if (!corgi_ts || !input_dev) | |
52c1f570 | 280 | goto fail1; |
1da177e4 | 281 | |
3ae5eaec | 282 | platform_set_drvdata(pdev, corgi_ts); |
1da177e4 | 283 | |
3ae5eaec | 284 | corgi_ts->machinfo = pdev->dev.platform_data; |
513b6e1a RP |
285 | corgi_ts->irq_gpio = platform_get_irq(pdev, 0); |
286 | ||
287 | if (corgi_ts->irq_gpio < 0) { | |
eca1ed19 | 288 | err = -ENODEV; |
52c1f570 | 289 | goto fail1; |
513b6e1a RP |
290 | } |
291 | ||
eca1ed19 | 292 | corgi_ts->input = input_dev; |
1da177e4 | 293 | |
eca1ed19 DT |
294 | init_timer(&corgi_ts->timer); |
295 | corgi_ts->timer.data = (unsigned long) corgi_ts; | |
296 | corgi_ts->timer.function = corgi_ts_timer; | |
1da177e4 | 297 | |
eca1ed19 DT |
298 | input_dev->name = "Corgi Touchscreen"; |
299 | input_dev->phys = "corgits/input0"; | |
300 | input_dev->id.bustype = BUS_HOST; | |
301 | input_dev->id.vendor = 0x0001; | |
302 | input_dev->id.product = 0x0002; | |
303 | input_dev->id.version = 0x0100; | |
a5394fb0 | 304 | input_dev->dev.parent = &pdev->dev; |
eca1ed19 | 305 | |
7b19ada2 JS |
306 | input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS); |
307 | input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH); | |
eca1ed19 DT |
308 | input_set_abs_params(input_dev, ABS_X, X_AXIS_MIN, X_AXIS_MAX, 0, 0); |
309 | input_set_abs_params(input_dev, ABS_Y, Y_AXIS_MIN, Y_AXIS_MAX, 0, 0); | |
310 | input_set_abs_params(input_dev, ABS_PRESSURE, PRESSURE_MIN, PRESSURE_MAX, 0, 0); | |
1da177e4 | 311 | |
513b6e1a | 312 | pxa_gpio_mode(IRQ_TO_GPIO(corgi_ts->irq_gpio) | GPIO_IN); |
1da177e4 LT |
313 | |
314 | /* Initiaize ADS7846 Difference Reference mode */ | |
315 | corgi_ssp_ads7846_putget((1u << ADSCTRL_ADR_SH) | ADSCTRL_STS); | |
316 | mdelay(5); | |
317 | corgi_ssp_ads7846_putget((3u << ADSCTRL_ADR_SH) | ADSCTRL_STS); | |
318 | mdelay(5); | |
319 | corgi_ssp_ads7846_putget((4u << ADSCTRL_ADR_SH) | ADSCTRL_STS); | |
320 | mdelay(5); | |
321 | corgi_ssp_ads7846_putget((5u << ADSCTRL_ADR_SH) | ADSCTRL_STS); | |
322 | mdelay(5); | |
323 | ||
dace1453 | 324 | if (request_irq(corgi_ts->irq_gpio, ts_interrupt, IRQF_DISABLED, "ts", corgi_ts)) { |
eca1ed19 | 325 | err = -EBUSY; |
52c1f570 | 326 | goto fail1; |
1da177e4 LT |
327 | } |
328 | ||
52c1f570 DT |
329 | err = input_register_device(corgi_ts->input); |
330 | if (err) | |
331 | goto fail2; | |
eca1ed19 DT |
332 | |
333 | corgi_ts->power_mode = PWR_MODE_ACTIVE; | |
334 | ||
1da177e4 | 335 | /* Enable Falling Edge */ |
6cab4860 | 336 | set_irq_type(corgi_ts->irq_gpio, IRQ_TYPE_EDGE_FALLING); |
1da177e4 | 337 | |
1da177e4 | 338 | return 0; |
eca1ed19 | 339 | |
52c1f570 DT |
340 | fail2: free_irq(corgi_ts->irq_gpio, corgi_ts); |
341 | fail1: input_free_device(input_dev); | |
eca1ed19 DT |
342 | kfree(corgi_ts); |
343 | return err; | |
1da177e4 LT |
344 | } |
345 | ||
3ae5eaec | 346 | static int corgits_remove(struct platform_device *pdev) |
1da177e4 | 347 | { |
3ae5eaec | 348 | struct corgi_ts *corgi_ts = platform_get_drvdata(pdev); |
1da177e4 | 349 | |
52c1f570 | 350 | free_irq(corgi_ts->irq_gpio, corgi_ts); |
1da177e4 | 351 | del_timer_sync(&corgi_ts->timer); |
513b6e1a | 352 | corgi_ts->machinfo->put_hsync(); |
eca1ed19 | 353 | input_unregister_device(corgi_ts->input); |
1da177e4 LT |
354 | kfree(corgi_ts); |
355 | return 0; | |
356 | } | |
357 | ||
3ae5eaec | 358 | static struct platform_driver corgits_driver = { |
1da177e4 LT |
359 | .probe = corgits_probe, |
360 | .remove = corgits_remove, | |
361 | .suspend = corgits_suspend, | |
362 | .resume = corgits_resume, | |
3ae5eaec RK |
363 | .driver = { |
364 | .name = "corgi-ts", | |
d7b5247b | 365 | .owner = THIS_MODULE, |
3ae5eaec | 366 | }, |
1da177e4 LT |
367 | }; |
368 | ||
369 | static int __devinit corgits_init(void) | |
370 | { | |
3ae5eaec | 371 | return platform_driver_register(&corgits_driver); |
1da177e4 LT |
372 | } |
373 | ||
374 | static void __exit corgits_exit(void) | |
375 | { | |
3ae5eaec | 376 | platform_driver_unregister(&corgits_driver); |
1da177e4 LT |
377 | } |
378 | ||
379 | module_init(corgits_init); | |
380 | module_exit(corgits_exit); | |
381 | ||
382 | MODULE_AUTHOR("Richard Purdie <rpurdie@rpsys.net>"); | |
383 | MODULE_DESCRIPTION("Corgi TouchScreen Driver"); | |
384 | MODULE_LICENSE("GPL"); | |
d7b5247b | 385 | MODULE_ALIAS("platform:corgi-ts"); |