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347e4843fa
linux/drivers/input/touchscreen/corgi_ts.c
Richard Purdie 347e4843fa [PATCH] Corgi Touchscreen: Allow the driver to share the PMU 
The Corgi Touchscreen driver uses the PMU as an accurate timing source which
conflicts with its usage for performance monitoring.  This patch allows it to
be shared with other users such as oprofile.

Signed-off-by: Richard Purdie <rpurdie@rpsys.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-09-07 16:57:53 -07:00

384 lines
9.5 KiB
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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 PMNC_GET(x) asm volatile ("mrc p14, 0, %0, C0, C0, 0" : "=r"(x))
#define PMNC_SET(x) asm volatile ("mcr p14, 0, %0, C0, C0, 0" : : "r"(x))
#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)
{
unsigned long timer1 = 0, timer2, pmnc = 0;
int pos = 0;
int dosleep;
dosleep = !w100fb_get_blanking();
if (dosleep && doSend) {
PMNC_GET(pmnc);
if (!(pmnc & 0x01))
PMNC_SET(pmnc | 0x01);
/* 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 && !(pmnc & 0x01))
PMNC_SET(pmnc);
}
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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