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>
20 #include <linux/irq.h>
22 #include <mach/sharpsl.h>
23 #include <mach/hardware.h>
24 #include <mach/pxa-regs.h>
25 #include <mach/pxa2xx-gpio.h>
28 #define PWR_MODE_ACTIVE 0
29 #define PWR_MODE_SUSPEND 1
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
45 struct input_dev *input;
46 struct timer_list timer;
51 struct corgits_machinfo *machinfo;
55 #define CCNT(a) asm volatile ("mrc p14, 0, %0, C1, C0, 0" : "=r"(a))
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))
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))
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 */
73 /* External Functions */
74 extern unsigned int get_clk_frequency_khz(int info);
76 static unsigned long calc_waittime(struct corgi_ts *corgi_ts)
78 unsigned long hsync_invperiod = corgi_ts->machinfo->get_hsync_invperiod();
81 return get_clk_frequency_khz(0)*1000/hsync_invperiod;
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)
89 unsigned long timer1 = 0, timer2, pmnc = 0;
92 if (wait_time && doSend) {
98 corgi_ts->machinfo->wait_hsync();
104 pos = corgi_ssp_ads7846_get();
107 int cmd = ADSCTRL_PD0 | ADSCTRL_PD1 | (address << ADSCTRL_ADR_SH) | ADSCTRL_STS;
109 corgi_ssp_ads7846_put(cmd);
110 corgi_ssp_ads7846_get();
113 /* Wait after HSync */
115 if (timer2-timer1 > wait_time) {
116 /* too slow - timeout, try again */
117 corgi_ts->machinfo->wait_hsync();
120 /* Wait after HSync */
123 while (timer2 - timer1 < wait_time)
126 corgi_ssp_ads7846_put(cmd);
127 if (wait_time && !(pmnc & 0x01))
133 static int read_xydata(struct corgi_ts *corgi_ts)
135 unsigned int x, y, z1, z2;
136 unsigned long flags, wait_time;
138 /* critical section */
139 local_irq_save(flags);
140 corgi_ssp_ads7846_lock();
141 wait_time = calc_waittime(corgi_ts);
144 sync_receive_data_send_cmd(corgi_ts, 0, 1, 1u, wait_time);
147 sync_receive_data_send_cmd(corgi_ts, 1, 1, 1u, wait_time);
150 y = sync_receive_data_send_cmd(corgi_ts, 1, 1, 5u, wait_time);
153 x = sync_receive_data_send_cmd(corgi_ts, 1, 1, 3u, wait_time);
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);
159 /* Power-Down Enable */
160 corgi_ssp_ads7846_put((1u << ADSCTRL_ADR_SH) | ADSCTRL_STS);
161 corgi_ssp_ads7846_get();
163 corgi_ssp_ads7846_unlock();
164 local_irq_restore(flags);
166 if (x== 0 || y == 0 || z1 == 0 || (x * (z2 - z1) / z1) >= 15000) {
167 corgi_ts->tc.pressure = 0;
173 corgi_ts->tc.pressure = (x * (z2 - z1)) / z1;
177 static void new_data(struct corgi_ts *corgi_ts)
179 struct input_dev *dev = corgi_ts->input;
181 if (corgi_ts->power_mode != PWR_MODE_ACTIVE)
184 if (!corgi_ts->tc.pressure && corgi_ts->pendown == 0)
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);
194 static void ts_interrupt_main(struct corgi_ts *corgi_ts, int isTimer)
196 if ((GPLR(IRQ_TO_GPIO(corgi_ts->irq_gpio)) & GPIO_bit(IRQ_TO_GPIO(corgi_ts->irq_gpio))) == 0) {
197 /* Disable Interrupt */
198 set_irq_type(corgi_ts->irq_gpio, IRQ_TYPE_NONE);
199 if (read_xydata(corgi_ts)) {
200 corgi_ts->pendown = 1;
203 mod_timer(&corgi_ts->timer, jiffies + HZ / 100);
205 if (corgi_ts->pendown == 1 || corgi_ts->pendown == 2) {
206 mod_timer(&corgi_ts->timer, jiffies + HZ / 100);
211 if (corgi_ts->pendown) {
212 corgi_ts->tc.pressure = 0;
216 /* Enable Falling Edge */
217 set_irq_type(corgi_ts->irq_gpio, IRQ_TYPE_EDGE_FALLING);
218 corgi_ts->pendown = 0;
222 static void corgi_ts_timer(unsigned long data)
224 struct corgi_ts *corgits_data = (struct corgi_ts *) data;
226 ts_interrupt_main(corgits_data, 1);
229 static irqreturn_t ts_interrupt(int irq, void *dev_id)
231 struct corgi_ts *corgits_data = dev_id;
233 ts_interrupt_main(corgits_data, 0);
238 static int corgits_suspend(struct platform_device *dev, pm_message_t state)
240 struct corgi_ts *corgi_ts = platform_get_drvdata(dev);
242 if (corgi_ts->pendown) {
243 del_timer_sync(&corgi_ts->timer);
244 corgi_ts->tc.pressure = 0;
246 corgi_ts->pendown = 0;
248 corgi_ts->power_mode = PWR_MODE_SUSPEND;
250 corgi_ssp_ads7846_putget((1u << ADSCTRL_ADR_SH) | ADSCTRL_STS);
255 static int corgits_resume(struct platform_device *dev)
257 struct corgi_ts *corgi_ts = platform_get_drvdata(dev);
259 corgi_ssp_ads7846_putget((4u << ADSCTRL_ADR_SH) | ADSCTRL_STS);
260 /* Enable Falling Edge */
261 set_irq_type(corgi_ts->irq_gpio, IRQ_TYPE_EDGE_FALLING);
262 corgi_ts->power_mode = PWR_MODE_ACTIVE;
267 #define corgits_suspend NULL
268 #define corgits_resume NULL
271 static int __init corgits_probe(struct platform_device *pdev)
273 struct corgi_ts *corgi_ts;
274 struct input_dev *input_dev;
277 corgi_ts = kzalloc(sizeof(struct corgi_ts), GFP_KERNEL);
278 input_dev = input_allocate_device();
279 if (!corgi_ts || !input_dev)
282 platform_set_drvdata(pdev, corgi_ts);
284 corgi_ts->machinfo = pdev->dev.platform_data;
285 corgi_ts->irq_gpio = platform_get_irq(pdev, 0);
287 if (corgi_ts->irq_gpio < 0) {
292 corgi_ts->input = input_dev;
294 init_timer(&corgi_ts->timer);
295 corgi_ts->timer.data = (unsigned long) corgi_ts;
296 corgi_ts->timer.function = corgi_ts_timer;
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;
304 input_dev->dev.parent = &pdev->dev;
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);
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);
312 pxa_gpio_mode(IRQ_TO_GPIO(corgi_ts->irq_gpio) | 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 if (request_irq(corgi_ts->irq_gpio, ts_interrupt, IRQF_DISABLED, "ts", corgi_ts)) {
329 err = input_register_device(corgi_ts->input);
333 corgi_ts->power_mode = PWR_MODE_ACTIVE;
335 /* Enable Falling Edge */
336 set_irq_type(corgi_ts->irq_gpio, IRQ_TYPE_EDGE_FALLING);
340 fail2: free_irq(corgi_ts->irq_gpio, corgi_ts);
341 fail1: input_free_device(input_dev);
346 static int corgits_remove(struct platform_device *pdev)
348 struct corgi_ts *corgi_ts = platform_get_drvdata(pdev);
350 free_irq(corgi_ts->irq_gpio, corgi_ts);
351 del_timer_sync(&corgi_ts->timer);
352 corgi_ts->machinfo->put_hsync();
353 input_unregister_device(corgi_ts->input);
358 static struct platform_driver corgits_driver = {
359 .probe = corgits_probe,
360 .remove = corgits_remove,
361 .suspend = corgits_suspend,
362 .resume = corgits_resume,
365 .owner = THIS_MODULE,
369 static int __devinit corgits_init(void)
371 return platform_driver_register(&corgits_driver);
374 static void __exit corgits_exit(void)
376 platform_driver_unregister(&corgits_driver);
379 module_init(corgits_init);
380 module_exit(corgits_exit);
382 MODULE_AUTHOR("Richard Purdie <rpurdie@rpsys.net>");
383 MODULE_DESCRIPTION("Corgi TouchScreen Driver");
384 MODULE_LICENSE("GPL");
385 MODULE_ALIAS("platform:corgi-ts");