2 * Touchscreen driver for Sharp SL-C7xx and SL-Cxx00 models
4 * Copyright (c) 2004-2005 Richard Purdie
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.
13 #include <linux/delay.h>
14 #include <linux/platform_device.h>
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>
22 #include <asm/arch/sharpsl.h>
23 #include <asm/arch/hardware.h>
24 #include <asm/arch/pxa-regs.h>
27 #define PWR_MODE_ACTIVE 0
28 #define PWR_MODE_SUSPEND 1
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
44 struct input_dev *input;
45 struct timer_list timer;
50 struct corgits_machinfo *machinfo;
54 #define CCNT(a) asm volatile ("mrc p14, 0, %0, C1, C0, 0" : "=r"(a))
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))
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))
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 */
72 /* External Functions */
73 extern unsigned int get_clk_frequency_khz(int info);
75 static unsigned long calc_waittime(struct corgi_ts *corgi_ts)
77 unsigned long hsync_len = corgi_ts->machinfo->get_hsync_len();
80 return get_clk_frequency_khz(0)*1000/hsync_len;
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)
88 unsigned long timer1 = 0, timer2, pmnc = 0;
91 if (wait_time && doSend) {
97 corgi_ts->machinfo->wait_hsync();
103 pos = corgi_ssp_ads7846_get();
106 int cmd = ADSCTRL_PD0 | ADSCTRL_PD1 | (address << ADSCTRL_ADR_SH) | ADSCTRL_STS;
108 corgi_ssp_ads7846_put(cmd);
109 corgi_ssp_ads7846_get();
112 /* Wait after HSync */
114 if (timer2-timer1 > wait_time) {
115 /* too slow - timeout, try again */
116 corgi_ts->machinfo->wait_hsync();
119 /* Wait after HSync */
122 while (timer2 - timer1 < wait_time)
125 corgi_ssp_ads7846_put(cmd);
126 if (wait_time && !(pmnc & 0x01))
132 static int read_xydata(struct corgi_ts *corgi_ts)
134 unsigned int x, y, z1, z2;
135 unsigned long flags, wait_time;
137 /* critical section */
138 local_irq_save(flags);
139 corgi_ssp_ads7846_lock();
140 wait_time = calc_waittime(corgi_ts);
143 sync_receive_data_send_cmd(corgi_ts, 0, 1, 1u, wait_time);
146 sync_receive_data_send_cmd(corgi_ts, 1, 1, 1u, wait_time);
149 y = sync_receive_data_send_cmd(corgi_ts, 1, 1, 5u, wait_time);
152 x = sync_receive_data_send_cmd(corgi_ts, 1, 1, 3u, wait_time);
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);
158 /* Power-Down Enable */
159 corgi_ssp_ads7846_put((1u << ADSCTRL_ADR_SH) | ADSCTRL_STS);
160 corgi_ssp_ads7846_get();
162 corgi_ssp_ads7846_unlock();
163 local_irq_restore(flags);
165 if (x== 0 || y == 0 || z1 == 0 || (x * (z2 - z1) / z1) >= 15000) {
166 corgi_ts->tc.pressure = 0;
172 corgi_ts->tc.pressure = (x * (z2 - z1)) / z1;
176 static void new_data(struct corgi_ts *corgi_ts, struct pt_regs *regs)
178 if (corgi_ts->power_mode != PWR_MODE_ACTIVE)
181 if (!corgi_ts->tc.pressure && corgi_ts->pendown == 0)
184 input_regs(corgi_ts->input, regs);
185 input_report_abs(corgi_ts->input, ABS_X, corgi_ts->tc.x);
186 input_report_abs(corgi_ts->input, ABS_Y, corgi_ts->tc.y);
187 input_report_abs(corgi_ts->input, ABS_PRESSURE, corgi_ts->tc.pressure);
188 input_report_key(corgi_ts->input, BTN_TOUCH, (corgi_ts->pendown != 0));
189 input_sync(corgi_ts->input);
192 static void ts_interrupt_main(struct corgi_ts *corgi_ts, int isTimer, struct pt_regs *regs)
194 if ((GPLR(IRQ_TO_GPIO(corgi_ts->irq_gpio)) & GPIO_bit(IRQ_TO_GPIO(corgi_ts->irq_gpio))) == 0) {
195 /* Disable Interrupt */
196 set_irq_type(corgi_ts->irq_gpio, IRQT_NOEDGE);
197 if (read_xydata(corgi_ts)) {
198 corgi_ts->pendown = 1;
199 new_data(corgi_ts, regs);
201 mod_timer(&corgi_ts->timer, jiffies + HZ / 100);
203 if (corgi_ts->pendown == 1 || corgi_ts->pendown == 2) {
204 mod_timer(&corgi_ts->timer, jiffies + HZ / 100);
209 if (corgi_ts->pendown) {
210 corgi_ts->tc.pressure = 0;
211 new_data(corgi_ts, regs);
214 /* Enable Falling Edge */
215 set_irq_type(corgi_ts->irq_gpio, IRQT_FALLING);
216 corgi_ts->pendown = 0;
220 static void corgi_ts_timer(unsigned long data)
222 struct corgi_ts *corgits_data = (struct corgi_ts *) data;
223 ts_interrupt_main(corgits_data, 1, NULL);
226 static irqreturn_t ts_interrupt(int irq, void *dev_id, struct pt_regs *regs)
228 struct corgi_ts *corgits_data = dev_id;
229 ts_interrupt_main(corgits_data, 0, regs);
234 static int corgits_suspend(struct device *dev, pm_message_t state)
236 struct corgi_ts *corgi_ts = dev_get_drvdata(dev);
238 if (corgi_ts->pendown) {
239 del_timer_sync(&corgi_ts->timer);
240 corgi_ts->tc.pressure = 0;
241 new_data(corgi_ts, NULL);
242 corgi_ts->pendown = 0;
244 corgi_ts->power_mode = PWR_MODE_SUSPEND;
246 corgi_ssp_ads7846_putget((1u << ADSCTRL_ADR_SH) | ADSCTRL_STS);
251 static int corgits_resume(struct device *dev)
253 struct corgi_ts *corgi_ts = dev_get_drvdata(dev);
255 corgi_ssp_ads7846_putget((4u << ADSCTRL_ADR_SH) | ADSCTRL_STS);
256 /* Enable Falling Edge */
257 set_irq_type(corgi_ts->irq_gpio, IRQT_FALLING);
258 corgi_ts->power_mode = PWR_MODE_ACTIVE;
263 #define corgits_suspend NULL
264 #define corgits_resume NULL
267 static int __init corgits_probe(struct device *dev)
269 struct corgi_ts *corgi_ts;
270 struct platform_device *pdev = to_platform_device(dev);
271 struct input_dev *input_dev;
274 corgi_ts = kzalloc(sizeof(struct corgi_ts), GFP_KERNEL);
275 input_dev = input_allocate_device();
276 if (!corgi_ts || !input_dev)
279 dev_set_drvdata(dev, corgi_ts);
281 corgi_ts->machinfo = dev->platform_data;
282 corgi_ts->irq_gpio = platform_get_irq(pdev, 0);
284 if (corgi_ts->irq_gpio < 0) {
289 corgi_ts->input = input_dev;
291 init_timer(&corgi_ts->timer);
292 corgi_ts->timer.data = (unsigned long) corgi_ts;
293 corgi_ts->timer.function = corgi_ts_timer;
295 input_dev->name = "Corgi Touchscreen";
296 input_dev->phys = "corgits/input0";
297 input_dev->id.bustype = BUS_HOST;
298 input_dev->id.vendor = 0x0001;
299 input_dev->id.product = 0x0002;
300 input_dev->id.version = 0x0100;
301 input_dev->cdev.dev = dev;
302 input_dev->private = corgi_ts;
304 input_dev->evbit[0] = BIT(EV_KEY) | BIT(EV_ABS);
305 input_dev->keybit[LONG(BTN_TOUCH)] = BIT(BTN_TOUCH);
306 input_set_abs_params(input_dev, ABS_X, X_AXIS_MIN, X_AXIS_MAX, 0, 0);
307 input_set_abs_params(input_dev, ABS_Y, Y_AXIS_MIN, Y_AXIS_MAX, 0, 0);
308 input_set_abs_params(input_dev, ABS_PRESSURE, PRESSURE_MIN, PRESSURE_MAX, 0, 0);
310 pxa_gpio_mode(IRQ_TO_GPIO(corgi_ts->irq_gpio) | GPIO_IN);
312 /* Initiaize ADS7846 Difference Reference mode */
313 corgi_ssp_ads7846_putget((1u << ADSCTRL_ADR_SH) | ADSCTRL_STS);
315 corgi_ssp_ads7846_putget((3u << ADSCTRL_ADR_SH) | ADSCTRL_STS);
317 corgi_ssp_ads7846_putget((4u << ADSCTRL_ADR_SH) | ADSCTRL_STS);
319 corgi_ssp_ads7846_putget((5u << ADSCTRL_ADR_SH) | ADSCTRL_STS);
322 if (request_irq(corgi_ts->irq_gpio, ts_interrupt, SA_INTERRUPT, "ts", corgi_ts)) {
327 input_register_device(corgi_ts->input);
329 corgi_ts->power_mode = PWR_MODE_ACTIVE;
331 /* Enable Falling Edge */
332 set_irq_type(corgi_ts->irq_gpio, IRQT_FALLING);
336 fail: input_free_device(input_dev);
342 static int corgits_remove(struct device *dev)
344 struct corgi_ts *corgi_ts = dev_get_drvdata(dev);
346 free_irq(corgi_ts->irq_gpio, NULL);
347 del_timer_sync(&corgi_ts->timer);
348 corgi_ts->machinfo->put_hsync();
349 input_unregister_device(corgi_ts->input);
354 static struct device_driver corgits_driver = {
356 .bus = &platform_bus_type,
357 .probe = corgits_probe,
358 .remove = corgits_remove,
359 .suspend = corgits_suspend,
360 .resume = corgits_resume,
363 static int __devinit corgits_init(void)
365 return driver_register(&corgits_driver);
368 static void __exit corgits_exit(void)
370 driver_unregister(&corgits_driver);
373 module_init(corgits_init);
374 module_exit(corgits_exit);
376 MODULE_AUTHOR("Richard Purdie <rpurdie@rpsys.net>");
377 MODULE_DESCRIPTION("Corgi TouchScreen Driver");
378 MODULE_LICENSE("GPL");