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