2 * Touchscreen driver for Sharp Corgi models (SL-C7xx)
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/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/corgi.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
45 struct input_dev input;
46 struct timer_list timer;
52 #define STATUS_HSYNC (GPLR(CORGI_GPIO_HSYNC) & GPIO_bit(CORGI_GPIO_HSYNC))
54 #define SyncHS() while((STATUS_HSYNC) == 0); while((STATUS_HSYNC) != 0);
55 #define CCNT(a) asm volatile ("mrc p14, 0, %0, C1, C0, 0" : "=r"(a))
56 #define CCNT_ON() {int pmnc = 1; asm volatile ("mcr p14, 0, %0, C0, C0, 0" : : "r"(pmnc));}
57 #define CCNT_OFF() {int pmnc = 0; asm volatile ("mcr p14, 0, %0, C0, C0, 0" : : "r"(pmnc));}
59 #define WAIT_HS_400_VGA 7013U // 17.615us
60 #define WAIT_HS_400_QVGA 16622U // 41.750us
63 /* ADS7846 Touch Screen Controller bit definitions */
64 #define ADSCTRL_PD0 (1u << 0) /* PD0 */
65 #define ADSCTRL_PD1 (1u << 1) /* PD1 */
66 #define ADSCTRL_DFR (1u << 2) /* SER/DFR */
67 #define ADSCTRL_MOD (1u << 3) /* Mode */
68 #define ADSCTRL_ADR_SH 4 /* Address setting */
69 #define ADSCTRL_STS (1u << 7) /* Start Bit */
71 /* External Functions */
72 extern int w100fb_get_xres(void);
73 extern int w100fb_get_blanking(void);
74 extern int w100fb_get_fastsysclk(void);
75 extern unsigned int get_clk_frequency_khz(int info);
77 static unsigned long calc_waittime(void)
79 int w100fb_xres = w100fb_get_xres();
80 unsigned int waittime = 0;
82 if (w100fb_xres == 480 || w100fb_xres == 640) {
83 waittime = WAIT_HS_400_VGA * get_clk_frequency_khz(0) / 398131U;
85 if (w100fb_get_fastsysclk() == 100)
86 waittime = waittime * 75 / 100;
88 if (w100fb_xres == 640)
94 return WAIT_HS_400_QVGA * get_clk_frequency_khz(0) / 398131U;
97 static int sync_receive_data_send_cmd(int doRecive, int doSend, unsigned int address, unsigned long wait_time)
100 unsigned long timer1 = 0, timer2;
103 dosleep = !w100fb_get_blanking();
105 if (dosleep && doSend) {
114 pos = corgi_ssp_ads7846_get();
117 int cmd = ADSCTRL_PD0 | ADSCTRL_PD1 | (address << ADSCTRL_ADR_SH) | ADSCTRL_STS;
119 corgi_ssp_ads7846_put(cmd);
120 corgi_ssp_ads7846_get();
123 /* Wait after HSync */
125 if (timer2-timer1 > wait_time) {
130 /* Wait after HSync */
133 while (timer2 - timer1 < wait_time)
136 corgi_ssp_ads7846_put(cmd);
143 static int read_xydata(struct corgi_ts *corgi_ts)
145 unsigned int x, y, z1, z2;
146 unsigned long flags, wait_time;
148 /* critical section */
149 local_irq_save(flags);
150 corgi_ssp_ads7846_lock();
151 wait_time=calc_waittime();
154 sync_receive_data_send_cmd(0, 1, 1u, wait_time);
157 sync_receive_data_send_cmd(1, 1, 1u, wait_time);
160 y = sync_receive_data_send_cmd(1, 1, 5u, wait_time);
163 x = sync_receive_data_send_cmd(1, 1, 3u, wait_time);
166 z1 = sync_receive_data_send_cmd(1, 1, 4u, wait_time);
167 z2 = sync_receive_data_send_cmd(1, 0, 4u, wait_time);
169 /* Power-Down Enable */
170 corgi_ssp_ads7846_put((1u << ADSCTRL_ADR_SH) | ADSCTRL_STS);
171 corgi_ssp_ads7846_get();
173 corgi_ssp_ads7846_unlock();
174 local_irq_restore(flags);
176 if (x== 0 || y == 0 || z1 == 0 || (x * (z2 - z1) / z1) >= 15000) {
177 corgi_ts->tc.pressure = 0;
183 corgi_ts->tc.pressure = (x * (z2 - z1)) / z1;
187 static void new_data(struct corgi_ts *corgi_ts, struct pt_regs *regs)
189 if (corgi_ts->power_mode != PWR_MODE_ACTIVE)
192 if (!corgi_ts->tc.pressure && corgi_ts->pendown == 0)
196 input_regs(&corgi_ts->input, regs);
198 input_report_abs(&corgi_ts->input, ABS_X, corgi_ts->tc.x);
199 input_report_abs(&corgi_ts->input, ABS_Y, corgi_ts->tc.y);
200 input_report_abs(&corgi_ts->input, ABS_PRESSURE, corgi_ts->tc.pressure);
201 input_report_key(&corgi_ts->input, BTN_TOUCH, (corgi_ts->pendown != 0));
202 input_sync(&corgi_ts->input);
205 static void ts_interrupt_main(struct corgi_ts *corgi_ts, int isTimer, struct pt_regs *regs)
207 if ((GPLR(CORGI_GPIO_TP_INT) & GPIO_bit(CORGI_GPIO_TP_INT)) == 0) {
208 /* Disable Interrupt */
209 set_irq_type(CORGI_IRQ_GPIO_TP_INT, IRQT_NOEDGE);
210 if (read_xydata(corgi_ts)) {
211 corgi_ts->pendown = 1;
212 new_data(corgi_ts, regs);
214 mod_timer(&corgi_ts->timer, jiffies + HZ / 100);
216 if (corgi_ts->pendown == 1 || corgi_ts->pendown == 2) {
217 mod_timer(&corgi_ts->timer, jiffies + HZ / 100);
222 if (corgi_ts->pendown) {
223 corgi_ts->tc.pressure = 0;
224 new_data(corgi_ts, regs);
227 /* Enable Falling Edge */
228 set_irq_type(CORGI_IRQ_GPIO_TP_INT, IRQT_FALLING);
229 corgi_ts->pendown = 0;
233 static void corgi_ts_timer(unsigned long data)
235 struct corgi_ts *corgits_data = (struct corgi_ts *) data;
236 ts_interrupt_main(corgits_data, 1, NULL);
239 static irqreturn_t ts_interrupt(int irq, void *dev_id, struct pt_regs *regs)
241 struct corgi_ts *corgits_data = dev_id;
242 ts_interrupt_main(corgits_data, 0, regs);
247 static int corgits_suspend(struct device *dev, uint32_t state, uint32_t level)
249 if (level == SUSPEND_POWER_DOWN) {
250 struct corgi_ts *corgi_ts = dev_get_drvdata(dev);
252 if (corgi_ts->pendown) {
253 del_timer_sync(&corgi_ts->timer);
254 corgi_ts->tc.pressure = 0;
255 new_data(corgi_ts, NULL);
256 corgi_ts->pendown = 0;
258 corgi_ts->power_mode = PWR_MODE_SUSPEND;
260 corgi_ssp_ads7846_putget((1u << ADSCTRL_ADR_SH) | ADSCTRL_STS);
265 static int corgits_resume(struct device *dev, uint32_t level)
267 if (level == RESUME_POWER_ON) {
268 struct corgi_ts *corgi_ts = dev_get_drvdata(dev);
270 corgi_ssp_ads7846_putget((4u << ADSCTRL_ADR_SH) | ADSCTRL_STS);
271 /* Enable Falling Edge */
272 set_irq_type(CORGI_IRQ_GPIO_TP_INT, IRQT_FALLING);
273 corgi_ts->power_mode = PWR_MODE_ACTIVE;
278 #define corgits_suspend NULL
279 #define corgits_resume NULL
282 static int __init corgits_probe(struct device *dev)
284 struct corgi_ts *corgi_ts;
286 if (!(corgi_ts = kmalloc(sizeof(struct corgi_ts), GFP_KERNEL)))
289 dev_set_drvdata(dev, corgi_ts);
291 memset(corgi_ts, 0, sizeof(struct corgi_ts));
293 init_input_dev(&corgi_ts->input);
294 corgi_ts->input.evbit[0] = BIT(EV_KEY) | BIT(EV_ABS);
295 corgi_ts->input.keybit[LONG(BTN_TOUCH)] = BIT(BTN_TOUCH);
296 input_set_abs_params(&corgi_ts->input, ABS_X, X_AXIS_MIN, X_AXIS_MAX, 0, 0);
297 input_set_abs_params(&corgi_ts->input, ABS_Y, Y_AXIS_MIN, Y_AXIS_MAX, 0, 0);
298 input_set_abs_params(&corgi_ts->input, ABS_PRESSURE, PRESSURE_MIN, PRESSURE_MAX, 0, 0);
300 strcpy(corgi_ts->phys, "corgits/input0");
302 corgi_ts->input.private = corgi_ts;
303 corgi_ts->input.name = "Corgi Touchscreen";
304 corgi_ts->input.dev = dev;
305 corgi_ts->input.phys = corgi_ts->phys;
306 corgi_ts->input.id.bustype = BUS_HOST;
307 corgi_ts->input.id.vendor = 0x0001;
308 corgi_ts->input.id.product = 0x0002;
309 corgi_ts->input.id.version = 0x0100;
311 pxa_gpio_mode(CORGI_GPIO_TP_INT | GPIO_IN);
312 pxa_gpio_mode(CORGI_GPIO_HSYNC | GPIO_IN);
314 /* Initiaize ADS7846 Difference Reference mode */
315 corgi_ssp_ads7846_putget((1u << ADSCTRL_ADR_SH) | ADSCTRL_STS);
317 corgi_ssp_ads7846_putget((3u << ADSCTRL_ADR_SH) | ADSCTRL_STS);
319 corgi_ssp_ads7846_putget((4u << ADSCTRL_ADR_SH) | ADSCTRL_STS);
321 corgi_ssp_ads7846_putget((5u << ADSCTRL_ADR_SH) | ADSCTRL_STS);
324 init_timer(&corgi_ts->timer);
325 corgi_ts->timer.data = (unsigned long) corgi_ts;
326 corgi_ts->timer.function = corgi_ts_timer;
328 input_register_device(&corgi_ts->input);
329 corgi_ts->power_mode = PWR_MODE_ACTIVE;
331 if (request_irq(CORGI_IRQ_GPIO_TP_INT, ts_interrupt, SA_INTERRUPT, "ts", corgi_ts)) {
332 input_unregister_device(&corgi_ts->input);
337 /* Enable Falling Edge */
338 set_irq_type(CORGI_IRQ_GPIO_TP_INT, IRQT_FALLING);
340 printk(KERN_INFO "input: Corgi Touchscreen Registered\n");
345 static int corgits_remove(struct device *dev)
347 struct corgi_ts *corgi_ts = dev_get_drvdata(dev);
349 free_irq(CORGI_IRQ_GPIO_TP_INT, NULL);
350 del_timer_sync(&corgi_ts->timer);
351 input_unregister_device(&corgi_ts->input);
356 static struct device_driver corgits_driver = {
358 .bus = &platform_bus_type,
359 .probe = corgits_probe,
360 .remove = corgits_remove,
361 .suspend = corgits_suspend,
362 .resume = corgits_resume,
365 static int __devinit corgits_init(void)
367 return driver_register(&corgits_driver);
370 static void __exit corgits_exit(void)
372 driver_unregister(&corgits_driver);
375 module_init(corgits_init);
376 module_exit(corgits_exit);
378 MODULE_AUTHOR("Richard Purdie <rpurdie@rpsys.net>");
379 MODULE_DESCRIPTION("Corgi TouchScreen Driver");
380 MODULE_LICENSE("GPL");