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linux/drivers/input/touchscreen/corgi_ts.c
Linus Torvalds 1da177e4c3 Linux-2.6.12-rc2 
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!
2005-04-16 15:20:36 -07:00

381 lines
9.4 KiB
C
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/*
* Touchscreen driver for Sharp Corgi models (SL-C7xx)
*
* Copyright (c) 2004-2005 Richard Purdie
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
*/
#include <linux/delay.h>
#include <linux/device.h>
#include <linux/init.h>
#include <linux/input.h>
#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <asm/irq.h>
#include <asm/arch/corgi.h>
#include <asm/arch/hardware.h>
#include <asm/arch/pxa-regs.h>
#define PWR_MODE_ACTIVE 0
#define PWR_MODE_SUSPEND 1
#define X_AXIS_MAX 3830
#define X_AXIS_MIN 150
#define Y_AXIS_MAX 3830
#define Y_AXIS_MIN 190
#define PRESSURE_MIN 0
#define PRESSURE_MAX 15000
struct ts_event {
short pressure;
short x;
short y;
};
struct corgi_ts {
char phys[32];
struct input_dev input;
struct timer_list timer;
struct ts_event tc;
int pendown;
int power_mode;
};
#define STATUS_HSYNC (GPLR(CORGI_GPIO_HSYNC) & GPIO_bit(CORGI_GPIO_HSYNC))
#define SyncHS() while((STATUS_HSYNC) == 0); while((STATUS_HSYNC) != 0);
#define CCNT(a) asm volatile ("mrc p14, 0, %0, C1, C0, 0" : "=r"(a))
#define CCNT_ON() {int pmnc = 1; asm volatile ("mcr p14, 0, %0, C0, C0, 0" : : "r"(pmnc));}
#define CCNT_OFF() {int pmnc = 0; asm volatile ("mcr p14, 0, %0, C0, C0, 0" : : "r"(pmnc));}
#define WAIT_HS_400_VGA 7013U // 17.615us
#define WAIT_HS_400_QVGA 16622U // 41.750us
/* ADS7846 Touch Screen Controller bit definitions */
#define ADSCTRL_PD0 (1u << 0) /* PD0 */
#define ADSCTRL_PD1 (1u << 1) /* PD1 */
#define ADSCTRL_DFR (1u << 2) /* SER/DFR */
#define ADSCTRL_MOD (1u << 3) /* Mode */
#define ADSCTRL_ADR_SH 4 /* Address setting */
#define ADSCTRL_STS (1u << 7) /* Start Bit */
/* External Functions */
extern int w100fb_get_xres(void);
extern int w100fb_get_blanking(void);
extern int w100fb_get_fastsysclk(void);
extern unsigned int get_clk_frequency_khz(int info);
static unsigned long calc_waittime(void)
{
int w100fb_xres = w100fb_get_xres();
unsigned int waittime = 0;
if (w100fb_xres == 480 || w100fb_xres == 640) {
waittime = WAIT_HS_400_VGA * get_clk_frequency_khz(0) / 398131U;
if (w100fb_get_fastsysclk() == 100)
waittime = waittime * 75 / 100;
if (w100fb_xres == 640)
waittime *= 3;
return waittime;
}
return WAIT_HS_400_QVGA * get_clk_frequency_khz(0) / 398131U;
}
static int sync_receive_data_send_cmd(int doRecive, int doSend, unsigned int address, unsigned long wait_time)
{
int pos = 0;
unsigned long timer1 = 0, timer2;
int dosleep;
dosleep = !w100fb_get_blanking();
if (dosleep && doSend) {
CCNT_ON();
/* polling HSync */
SyncHS();
/* get CCNT */
CCNT(timer1);
}
if (doRecive)
pos = corgi_ssp_ads7846_get();
if (doSend) {
int cmd = ADSCTRL_PD0 | ADSCTRL_PD1 | (address << ADSCTRL_ADR_SH) | ADSCTRL_STS;
/* dummy command */
corgi_ssp_ads7846_put(cmd);
corgi_ssp_ads7846_get();
if (dosleep) {
/* Wait after HSync */
CCNT(timer2);
if (timer2-timer1 > wait_time) {
/* timeout */
SyncHS();
/* get OSCR */
CCNT(timer1);
/* Wait after HSync */
CCNT(timer2);
}
while (timer2 - timer1 < wait_time)
CCNT(timer2);
}
corgi_ssp_ads7846_put(cmd);
if (dosleep)
CCNT_OFF();
}
return pos;
}
static int read_xydata(struct corgi_ts *corgi_ts)
{
unsigned int x, y, z1, z2;
unsigned long flags, wait_time;
/* critical section */
local_irq_save(flags);
corgi_ssp_ads7846_lock();
wait_time=calc_waittime();
/* Y-axis */
sync_receive_data_send_cmd(0, 1, 1u, wait_time);
/* Y-axis */
sync_receive_data_send_cmd(1, 1, 1u, wait_time);
/* X-axis */
y = sync_receive_data_send_cmd(1, 1, 5u, wait_time);
/* Z1 */
x = sync_receive_data_send_cmd(1, 1, 3u, wait_time);
/* Z2 */
z1 = sync_receive_data_send_cmd(1, 1, 4u, wait_time);
z2 = sync_receive_data_send_cmd(1, 0, 4u, wait_time);
/* Power-Down Enable */
corgi_ssp_ads7846_put((1u << ADSCTRL_ADR_SH) | ADSCTRL_STS);
corgi_ssp_ads7846_get();
corgi_ssp_ads7846_unlock();
local_irq_restore(flags);
if (x== 0 || y == 0 || z1 == 0 || (x * (z2 - z1) / z1) >= 15000) {
corgi_ts->tc.pressure = 0;
return 0;
}
corgi_ts->tc.x = x;
corgi_ts->tc.y = y;
corgi_ts->tc.pressure = (x * (z2 - z1)) / z1;
return 1;
}
static void new_data(struct corgi_ts *corgi_ts, struct pt_regs *regs)
{
if (corgi_ts->power_mode != PWR_MODE_ACTIVE)
return;
if (!corgi_ts->tc.pressure && corgi_ts->pendown == 0)
return;
if (regs)
input_regs(&corgi_ts->input, regs);
input_report_abs(&corgi_ts->input, ABS_X, corgi_ts->tc.x);
input_report_abs(&corgi_ts->input, ABS_Y, corgi_ts->tc.y);
input_report_abs(&corgi_ts->input, ABS_PRESSURE, corgi_ts->tc.pressure);
input_report_key(&corgi_ts->input, BTN_TOUCH, (corgi_ts->pendown != 0));
input_sync(&corgi_ts->input);
}
static void ts_interrupt_main(struct corgi_ts *corgi_ts, int isTimer, struct pt_regs *regs)
{
if ((GPLR(CORGI_GPIO_TP_INT) & GPIO_bit(CORGI_GPIO_TP_INT)) == 0) {
/* Disable Interrupt */
set_irq_type(CORGI_IRQ_GPIO_TP_INT, IRQT_NOEDGE);
if (read_xydata(corgi_ts)) {
corgi_ts->pendown = 1;
new_data(corgi_ts, regs);
}
mod_timer(&corgi_ts->timer, jiffies + HZ / 100);
} else {
if (corgi_ts->pendown == 1 || corgi_ts->pendown == 2) {
mod_timer(&corgi_ts->timer, jiffies + HZ / 100);
corgi_ts->pendown++;
return;
}
if (corgi_ts->pendown) {
corgi_ts->tc.pressure = 0;
new_data(corgi_ts, regs);
}
/* Enable Falling Edge */
set_irq_type(CORGI_IRQ_GPIO_TP_INT, IRQT_FALLING);
corgi_ts->pendown = 0;
}
}
static void corgi_ts_timer(unsigned long data)
{
struct corgi_ts *corgits_data = (struct corgi_ts *) data;
ts_interrupt_main(corgits_data, 1, NULL);
}
static irqreturn_t ts_interrupt(int irq, void *dev_id, struct pt_regs *regs)
{
struct corgi_ts *corgits_data = dev_id;
ts_interrupt_main(corgits_data, 0, regs);
return IRQ_HANDLED;
}
#ifdef CONFIG_PM
static int corgits_suspend(struct device *dev, uint32_t state, uint32_t level)
{
if (level == SUSPEND_POWER_DOWN) {
struct corgi_ts *corgi_ts = dev_get_drvdata(dev);
if (corgi_ts->pendown) {
del_timer_sync(&corgi_ts->timer);
corgi_ts->tc.pressure = 0;
new_data(corgi_ts, NULL);
corgi_ts->pendown = 0;
}
corgi_ts->power_mode = PWR_MODE_SUSPEND;
corgi_ssp_ads7846_putget((1u << ADSCTRL_ADR_SH) | ADSCTRL_STS);
}
return 0;
}
static int corgits_resume(struct device *dev, uint32_t level)
{
if (level == RESUME_POWER_ON) {
struct corgi_ts *corgi_ts = dev_get_drvdata(dev);
corgi_ssp_ads7846_putget((4u << ADSCTRL_ADR_SH) | ADSCTRL_STS);
/* Enable Falling Edge */
set_irq_type(CORGI_IRQ_GPIO_TP_INT, IRQT_FALLING);
corgi_ts->power_mode = PWR_MODE_ACTIVE;
}
return 0;
}
#else
#define corgits_suspend NULL
#define corgits_resume NULL
#endif
static int __init corgits_probe(struct device *dev)
{
struct corgi_ts *corgi_ts;
if (!(corgi_ts = kmalloc(sizeof(struct corgi_ts), GFP_KERNEL)))
return -ENOMEM;
dev_set_drvdata(dev, corgi_ts);
memset(corgi_ts, 0, sizeof(struct corgi_ts));
init_input_dev(&corgi_ts->input);
corgi_ts->input.evbit[0] = BIT(EV_KEY) | BIT(EV_ABS);
corgi_ts->input.keybit[LONG(BTN_TOUCH)] = BIT(BTN_TOUCH);
input_set_abs_params(&corgi_ts->input, ABS_X, X_AXIS_MIN, X_AXIS_MAX, 0, 0);
input_set_abs_params(&corgi_ts->input, ABS_Y, Y_AXIS_MIN, Y_AXIS_MAX, 0, 0);
input_set_abs_params(&corgi_ts->input, ABS_PRESSURE, PRESSURE_MIN, PRESSURE_MAX, 0, 0);
strcpy(corgi_ts->phys, "corgits/input0");
corgi_ts->input.private = corgi_ts;
corgi_ts->input.name = "Corgi Touchscreen";
corgi_ts->input.dev = dev;
corgi_ts->input.phys = corgi_ts->phys;
corgi_ts->input.id.bustype = BUS_HOST;
corgi_ts->input.id.vendor = 0x0001;
corgi_ts->input.id.product = 0x0002;
corgi_ts->input.id.version = 0x0100;
pxa_gpio_mode(CORGI_GPIO_TP_INT | GPIO_IN);
pxa_gpio_mode(CORGI_GPIO_HSYNC | GPIO_IN);
/* Initiaize ADS7846 Difference Reference mode */
corgi_ssp_ads7846_putget((1u << ADSCTRL_ADR_SH) | ADSCTRL_STS);
mdelay(5);
corgi_ssp_ads7846_putget((3u << ADSCTRL_ADR_SH) | ADSCTRL_STS);
mdelay(5);
corgi_ssp_ads7846_putget((4u << ADSCTRL_ADR_SH) | ADSCTRL_STS);
mdelay(5);
corgi_ssp_ads7846_putget((5u << ADSCTRL_ADR_SH) | ADSCTRL_STS);
mdelay(5);
init_timer(&corgi_ts->timer);
corgi_ts->timer.data = (unsigned long) corgi_ts;
corgi_ts->timer.function = corgi_ts_timer;
input_register_device(&corgi_ts->input);
corgi_ts->power_mode = PWR_MODE_ACTIVE;
if (request_irq(CORGI_IRQ_GPIO_TP_INT, ts_interrupt, SA_INTERRUPT, "ts", corgi_ts)) {
input_unregister_device(&corgi_ts->input);
kfree(corgi_ts);
return -EBUSY;
}
/* Enable Falling Edge */
set_irq_type(CORGI_IRQ_GPIO_TP_INT, IRQT_FALLING);
printk(KERN_INFO "input: Corgi Touchscreen Registered\n");
return 0;
}
static int corgits_remove(struct device *dev)
{
struct corgi_ts *corgi_ts = dev_get_drvdata(dev);
free_irq(CORGI_IRQ_GPIO_TP_INT, NULL);
del_timer_sync(&corgi_ts->timer);
input_unregister_device(&corgi_ts->input);
kfree(corgi_ts);
return 0;
}
static struct device_driver corgits_driver = {
.name = "corgi-ts",
.bus = &platform_bus_type,
.probe = corgits_probe,
.remove = corgits_remove,
.suspend = corgits_suspend,
.resume = corgits_resume,
};
static int __devinit corgits_init(void)
{
return driver_register(&corgits_driver);
}
static void __exit corgits_exit(void)
{
driver_unregister(&corgits_driver);
}
module_init(corgits_init);
module_exit(corgits_exit);
MODULE_AUTHOR("Richard Purdie <rpurdie@rpsys.net>");
MODULE_DESCRIPTION("Corgi TouchScreen Driver");
MODULE_LICENSE("GPL");
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