387 lines
9.4 KiB
C
387 lines
9.4 KiB
C
/*
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* Touchscreen driver for Sharp SL-C7xx and SL-Cxx00 models
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*
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* Copyright (c) 2004-2005 Richard Purdie
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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*/
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#include <linux/delay.h>
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#include <linux/platform_device.h>
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#include <linux/init.h>
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#include <linux/input.h>
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#include <linux/interrupt.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/irq.h>
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#include <mach/sharpsl.h>
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#include <mach/hardware.h>
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#include <mach/pxa-regs.h>
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#include <mach/pxa2xx-gpio.h>
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#define PWR_MODE_ACTIVE 0
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#define PWR_MODE_SUSPEND 1
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#define X_AXIS_MAX 3830
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#define X_AXIS_MIN 150
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#define Y_AXIS_MAX 3830
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#define Y_AXIS_MIN 190
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#define PRESSURE_MIN 0
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#define PRESSURE_MAX 15000
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struct ts_event {
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short pressure;
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short x;
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short y;
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};
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struct corgi_ts {
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struct input_dev *input;
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struct timer_list timer;
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struct ts_event tc;
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int pendown;
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int power_mode;
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int irq_gpio;
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struct corgits_machinfo *machinfo;
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};
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#ifdef CONFIG_PXA25x
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#define CCNT(a) asm volatile ("mrc p14, 0, %0, C1, C0, 0" : "=r"(a))
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#define PMNC_GET(x) asm volatile ("mrc p14, 0, %0, C0, C0, 0" : "=r"(x))
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#define PMNC_SET(x) asm volatile ("mcr p14, 0, %0, C0, C0, 0" : : "r"(x))
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#endif
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#ifdef CONFIG_PXA27x
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#define CCNT(a) asm volatile ("mrc p14, 0, %0, C1, C1, 0" : "=r"(a))
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#define PMNC_GET(x) asm volatile ("mrc p14, 0, %0, C0, C1, 0" : "=r"(x))
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#define PMNC_SET(x) asm volatile ("mcr p14, 0, %0, C0, C1, 0" : : "r"(x))
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#endif
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/* ADS7846 Touch Screen Controller bit definitions */
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#define ADSCTRL_PD0 (1u << 0) /* PD0 */
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#define ADSCTRL_PD1 (1u << 1) /* PD1 */
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#define ADSCTRL_DFR (1u << 2) /* SER/DFR */
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#define ADSCTRL_MOD (1u << 3) /* Mode */
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#define ADSCTRL_ADR_SH 4 /* Address setting */
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#define ADSCTRL_STS (1u << 7) /* Start Bit */
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/* External Functions */
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extern unsigned int get_clk_frequency_khz(int info);
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static unsigned long calc_waittime(struct corgi_ts *corgi_ts)
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{
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unsigned long hsync_invperiod = corgi_ts->machinfo->get_hsync_invperiod();
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if (hsync_invperiod)
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return get_clk_frequency_khz(0)*1000/hsync_invperiod;
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else
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return 0;
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}
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static int sync_receive_data_send_cmd(struct corgi_ts *corgi_ts, int doRecive, int doSend,
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unsigned int address, unsigned long wait_time)
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{
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unsigned long timer1 = 0, timer2, pmnc = 0;
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int pos = 0;
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if (wait_time && doSend) {
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PMNC_GET(pmnc);
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if (!(pmnc & 0x01))
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PMNC_SET(0x01);
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/* polling HSync */
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corgi_ts->machinfo->wait_hsync();
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/* get CCNT */
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CCNT(timer1);
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}
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if (doRecive)
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pos = corgi_ssp_ads7846_get();
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if (doSend) {
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int cmd = ADSCTRL_PD0 | ADSCTRL_PD1 | (address << ADSCTRL_ADR_SH) | ADSCTRL_STS;
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/* dummy command */
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corgi_ssp_ads7846_put(cmd);
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corgi_ssp_ads7846_get();
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if (wait_time) {
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/* Wait after HSync */
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CCNT(timer2);
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if (timer2-timer1 > wait_time) {
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/* too slow - timeout, try again */
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corgi_ts->machinfo->wait_hsync();
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/* get CCNT */
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CCNT(timer1);
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/* Wait after HSync */
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CCNT(timer2);
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}
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while (timer2 - timer1 < wait_time)
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CCNT(timer2);
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}
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corgi_ssp_ads7846_put(cmd);
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if (wait_time && !(pmnc & 0x01))
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PMNC_SET(pmnc);
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}
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return pos;
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}
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static int read_xydata(struct corgi_ts *corgi_ts)
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{
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unsigned int x, y, z1, z2;
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unsigned long flags, wait_time;
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/* critical section */
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local_irq_save(flags);
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corgi_ssp_ads7846_lock();
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wait_time = calc_waittime(corgi_ts);
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/* Y-axis */
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sync_receive_data_send_cmd(corgi_ts, 0, 1, 1u, wait_time);
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/* Y-axis */
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sync_receive_data_send_cmd(corgi_ts, 1, 1, 1u, wait_time);
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/* X-axis */
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y = sync_receive_data_send_cmd(corgi_ts, 1, 1, 5u, wait_time);
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/* Z1 */
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x = sync_receive_data_send_cmd(corgi_ts, 1, 1, 3u, wait_time);
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/* Z2 */
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z1 = sync_receive_data_send_cmd(corgi_ts, 1, 1, 4u, wait_time);
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z2 = sync_receive_data_send_cmd(corgi_ts, 1, 0, 4u, wait_time);
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/* Power-Down Enable */
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corgi_ssp_ads7846_put((1u << ADSCTRL_ADR_SH) | ADSCTRL_STS);
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corgi_ssp_ads7846_get();
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corgi_ssp_ads7846_unlock();
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local_irq_restore(flags);
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if (x== 0 || y == 0 || z1 == 0 || (x * (z2 - z1) / z1) >= 15000) {
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corgi_ts->tc.pressure = 0;
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return 0;
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}
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corgi_ts->tc.x = x;
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corgi_ts->tc.y = y;
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corgi_ts->tc.pressure = (x * (z2 - z1)) / z1;
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return 1;
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}
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static void new_data(struct corgi_ts *corgi_ts)
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{
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struct input_dev *dev = corgi_ts->input;
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if (corgi_ts->power_mode != PWR_MODE_ACTIVE)
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return;
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if (!corgi_ts->tc.pressure && corgi_ts->pendown == 0)
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return;
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input_report_abs(dev, ABS_X, corgi_ts->tc.x);
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input_report_abs(dev, ABS_Y, corgi_ts->tc.y);
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input_report_abs(dev, ABS_PRESSURE, corgi_ts->tc.pressure);
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input_report_key(dev, BTN_TOUCH, corgi_ts->pendown);
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input_sync(dev);
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}
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static void ts_interrupt_main(struct corgi_ts *corgi_ts, int isTimer)
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{
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if ((GPLR(IRQ_TO_GPIO(corgi_ts->irq_gpio)) & GPIO_bit(IRQ_TO_GPIO(corgi_ts->irq_gpio))) == 0) {
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/* Disable Interrupt */
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set_irq_type(corgi_ts->irq_gpio, IRQ_TYPE_NONE);
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if (read_xydata(corgi_ts)) {
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corgi_ts->pendown = 1;
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new_data(corgi_ts);
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}
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mod_timer(&corgi_ts->timer, jiffies + HZ / 100);
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} else {
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if (corgi_ts->pendown == 1 || corgi_ts->pendown == 2) {
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mod_timer(&corgi_ts->timer, jiffies + HZ / 100);
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corgi_ts->pendown++;
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return;
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}
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if (corgi_ts->pendown) {
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corgi_ts->tc.pressure = 0;
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new_data(corgi_ts);
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}
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/* Enable Falling Edge */
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set_irq_type(corgi_ts->irq_gpio, IRQ_TYPE_EDGE_FALLING);
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corgi_ts->pendown = 0;
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}
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}
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static void corgi_ts_timer(unsigned long data)
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{
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struct corgi_ts *corgits_data = (struct corgi_ts *) data;
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ts_interrupt_main(corgits_data, 1);
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}
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static irqreturn_t ts_interrupt(int irq, void *dev_id)
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{
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struct corgi_ts *corgits_data = dev_id;
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ts_interrupt_main(corgits_data, 0);
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return IRQ_HANDLED;
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}
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#ifdef CONFIG_PM
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static int corgits_suspend(struct platform_device *dev, pm_message_t state)
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{
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struct corgi_ts *corgi_ts = platform_get_drvdata(dev);
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if (corgi_ts->pendown) {
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del_timer_sync(&corgi_ts->timer);
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corgi_ts->tc.pressure = 0;
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new_data(corgi_ts);
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corgi_ts->pendown = 0;
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}
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corgi_ts->power_mode = PWR_MODE_SUSPEND;
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corgi_ssp_ads7846_putget((1u << ADSCTRL_ADR_SH) | ADSCTRL_STS);
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return 0;
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}
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static int corgits_resume(struct platform_device *dev)
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{
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struct corgi_ts *corgi_ts = platform_get_drvdata(dev);
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corgi_ssp_ads7846_putget((4u << ADSCTRL_ADR_SH) | ADSCTRL_STS);
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/* Enable Falling Edge */
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set_irq_type(corgi_ts->irq_gpio, IRQ_TYPE_EDGE_FALLING);
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corgi_ts->power_mode = PWR_MODE_ACTIVE;
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return 0;
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}
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#else
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#define corgits_suspend NULL
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#define corgits_resume NULL
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#endif
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static int __devinit corgits_probe(struct platform_device *pdev)
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{
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struct corgi_ts *corgi_ts;
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struct input_dev *input_dev;
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int err = -ENOMEM;
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corgi_ts = kzalloc(sizeof(struct corgi_ts), GFP_KERNEL);
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input_dev = input_allocate_device();
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if (!corgi_ts || !input_dev)
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goto fail1;
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platform_set_drvdata(pdev, corgi_ts);
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corgi_ts->machinfo = pdev->dev.platform_data;
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corgi_ts->irq_gpio = platform_get_irq(pdev, 0);
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if (corgi_ts->irq_gpio < 0) {
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err = -ENODEV;
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goto fail1;
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}
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corgi_ts->input = input_dev;
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init_timer(&corgi_ts->timer);
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corgi_ts->timer.data = (unsigned long) corgi_ts;
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corgi_ts->timer.function = corgi_ts_timer;
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input_dev->name = "Corgi Touchscreen";
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input_dev->phys = "corgits/input0";
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input_dev->id.bustype = BUS_HOST;
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input_dev->id.vendor = 0x0001;
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input_dev->id.product = 0x0002;
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input_dev->id.version = 0x0100;
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input_dev->dev.parent = &pdev->dev;
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input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
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input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
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input_set_abs_params(input_dev, ABS_X, X_AXIS_MIN, X_AXIS_MAX, 0, 0);
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input_set_abs_params(input_dev, ABS_Y, Y_AXIS_MIN, Y_AXIS_MAX, 0, 0);
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input_set_abs_params(input_dev, ABS_PRESSURE, PRESSURE_MIN, PRESSURE_MAX, 0, 0);
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pxa_gpio_mode(IRQ_TO_GPIO(corgi_ts->irq_gpio) | GPIO_IN);
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/* Initiaize ADS7846 Difference Reference mode */
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corgi_ssp_ads7846_putget((1u << ADSCTRL_ADR_SH) | ADSCTRL_STS);
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mdelay(5);
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corgi_ssp_ads7846_putget((3u << ADSCTRL_ADR_SH) | ADSCTRL_STS);
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mdelay(5);
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corgi_ssp_ads7846_putget((4u << ADSCTRL_ADR_SH) | ADSCTRL_STS);
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mdelay(5);
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corgi_ssp_ads7846_putget((5u << ADSCTRL_ADR_SH) | ADSCTRL_STS);
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mdelay(5);
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if (request_irq(corgi_ts->irq_gpio, ts_interrupt, IRQF_DISABLED, "ts", corgi_ts)) {
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err = -EBUSY;
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goto fail1;
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}
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err = input_register_device(corgi_ts->input);
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if (err)
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goto fail2;
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corgi_ts->power_mode = PWR_MODE_ACTIVE;
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/* Enable Falling Edge */
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set_irq_type(corgi_ts->irq_gpio, IRQ_TYPE_EDGE_FALLING);
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return 0;
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fail2: free_irq(corgi_ts->irq_gpio, corgi_ts);
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fail1: input_free_device(input_dev);
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kfree(corgi_ts);
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return err;
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}
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static int __devexit corgits_remove(struct platform_device *pdev)
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{
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struct corgi_ts *corgi_ts = platform_get_drvdata(pdev);
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free_irq(corgi_ts->irq_gpio, corgi_ts);
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del_timer_sync(&corgi_ts->timer);
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corgi_ts->machinfo->put_hsync();
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input_unregister_device(corgi_ts->input);
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kfree(corgi_ts);
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return 0;
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}
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static struct platform_driver corgits_driver = {
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.probe = corgits_probe,
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.remove = __devexit_p(corgits_remove),
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.suspend = corgits_suspend,
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.resume = corgits_resume,
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.driver = {
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.name = "corgi-ts",
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.owner = THIS_MODULE,
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},
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};
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static int __init corgits_init(void)
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{
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return platform_driver_register(&corgits_driver);
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}
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static void __exit corgits_exit(void)
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{
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platform_driver_unregister(&corgits_driver);
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}
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module_init(corgits_init);
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module_exit(corgits_exit);
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MODULE_AUTHOR("Richard Purdie <rpurdie@rpsys.net>");
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MODULE_DESCRIPTION("Corgi TouchScreen Driver");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("platform:corgi-ts");
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