338 lines
8.3 KiB
C
338 lines
8.3 KiB
C
/*
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* Copyright (c) 2008 Nuvoton technology corporation.
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*
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* Wan ZongShun <mcuos.com@gmail.com>
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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 as published by
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* the Free Software Foundation;version 2 of the License.
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*
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*/
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#include <linux/delay.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/io.h>
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#include <linux/clk.h>
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#include <linux/input.h>
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#include <linux/interrupt.h>
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#include <linux/slab.h>
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/* ADC controller bit defines */
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#define ADC_DELAY 0xf00
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#define ADC_DOWN 0x01
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#define ADC_TSC_Y (0x01 << 8)
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#define ADC_TSC_X (0x00 << 8)
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#define TSC_FOURWIRE (~(0x03 << 1))
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#define ADC_CLK_EN (0x01 << 28) /* ADC clock enable */
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#define ADC_READ_CON (0x01 << 12)
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#define ADC_CONV (0x01 << 13)
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#define ADC_SEMIAUTO (0x01 << 14)
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#define ADC_WAITTRIG (0x03 << 14)
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#define ADC_RST1 (0x01 << 16)
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#define ADC_RST0 (0x00 << 16)
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#define ADC_EN (0x01 << 17)
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#define ADC_INT (0x01 << 18)
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#define WT_INT (0x01 << 20)
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#define ADC_INT_EN (0x01 << 21)
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#define LVD_INT_EN (0x01 << 22)
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#define WT_INT_EN (0x01 << 23)
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#define ADC_DIV (0x04 << 1) /* div = 6 */
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enum ts_state {
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TS_WAIT_NEW_PACKET, /* We are waiting next touch report */
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TS_WAIT_X_COORD, /* We are waiting for ADC to report X coord */
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TS_WAIT_Y_COORD, /* We are waiting for ADC to report Y coord */
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TS_IDLE, /* Input device is closed, don't do anything */
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};
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struct w90p910_ts {
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struct input_dev *input;
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struct timer_list timer;
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struct clk *clk;
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int irq_num;
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void __iomem *ts_reg;
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spinlock_t lock;
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enum ts_state state;
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};
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static void w90p910_report_event(struct w90p910_ts *w90p910_ts, bool down)
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{
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struct input_dev *dev = w90p910_ts->input;
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if (down) {
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input_report_abs(dev, ABS_X,
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__raw_readl(w90p910_ts->ts_reg + 0x0c));
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input_report_abs(dev, ABS_Y,
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__raw_readl(w90p910_ts->ts_reg + 0x10));
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}
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input_report_key(dev, BTN_TOUCH, down);
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input_sync(dev);
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}
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static void w90p910_prepare_x_reading(struct w90p910_ts *w90p910_ts)
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{
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unsigned long ctlreg;
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__raw_writel(ADC_TSC_X, w90p910_ts->ts_reg + 0x04);
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ctlreg = __raw_readl(w90p910_ts->ts_reg);
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ctlreg &= ~(ADC_WAITTRIG | WT_INT | WT_INT_EN);
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ctlreg |= ADC_SEMIAUTO | ADC_INT_EN | ADC_CONV;
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__raw_writel(ctlreg, w90p910_ts->ts_reg);
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w90p910_ts->state = TS_WAIT_X_COORD;
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}
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static void w90p910_prepare_y_reading(struct w90p910_ts *w90p910_ts)
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{
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unsigned long ctlreg;
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__raw_writel(ADC_TSC_Y, w90p910_ts->ts_reg + 0x04);
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ctlreg = __raw_readl(w90p910_ts->ts_reg);
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ctlreg &= ~(ADC_WAITTRIG | ADC_INT | WT_INT_EN);
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ctlreg |= ADC_SEMIAUTO | ADC_INT_EN | ADC_CONV;
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__raw_writel(ctlreg, w90p910_ts->ts_reg);
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w90p910_ts->state = TS_WAIT_Y_COORD;
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}
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static void w90p910_prepare_next_packet(struct w90p910_ts *w90p910_ts)
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{
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unsigned long ctlreg;
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ctlreg = __raw_readl(w90p910_ts->ts_reg);
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ctlreg &= ~(ADC_INT | ADC_INT_EN | ADC_SEMIAUTO | ADC_CONV);
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ctlreg |= ADC_WAITTRIG | WT_INT_EN;
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__raw_writel(ctlreg, w90p910_ts->ts_reg);
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w90p910_ts->state = TS_WAIT_NEW_PACKET;
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}
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static irqreturn_t w90p910_ts_interrupt(int irq, void *dev_id)
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{
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struct w90p910_ts *w90p910_ts = dev_id;
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unsigned long flags;
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spin_lock_irqsave(&w90p910_ts->lock, flags);
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switch (w90p910_ts->state) {
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case TS_WAIT_NEW_PACKET:
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/*
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* The controller only generates interrupts when pen
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* is down.
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*/
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del_timer(&w90p910_ts->timer);
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w90p910_prepare_x_reading(w90p910_ts);
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break;
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case TS_WAIT_X_COORD:
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w90p910_prepare_y_reading(w90p910_ts);
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break;
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case TS_WAIT_Y_COORD:
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w90p910_report_event(w90p910_ts, true);
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w90p910_prepare_next_packet(w90p910_ts);
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mod_timer(&w90p910_ts->timer, jiffies + msecs_to_jiffies(100));
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break;
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case TS_IDLE:
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break;
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}
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spin_unlock_irqrestore(&w90p910_ts->lock, flags);
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return IRQ_HANDLED;
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}
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static void w90p910_check_pen_up(unsigned long data)
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{
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struct w90p910_ts *w90p910_ts = (struct w90p910_ts *) data;
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unsigned long flags;
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spin_lock_irqsave(&w90p910_ts->lock, flags);
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if (w90p910_ts->state == TS_WAIT_NEW_PACKET &&
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!(__raw_readl(w90p910_ts->ts_reg + 0x04) & ADC_DOWN)) {
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w90p910_report_event(w90p910_ts, false);
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}
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spin_unlock_irqrestore(&w90p910_ts->lock, flags);
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}
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static int w90p910_open(struct input_dev *dev)
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{
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struct w90p910_ts *w90p910_ts = input_get_drvdata(dev);
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unsigned long val;
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/* enable the ADC clock */
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clk_enable(w90p910_ts->clk);
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__raw_writel(ADC_RST1, w90p910_ts->ts_reg);
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msleep(1);
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__raw_writel(ADC_RST0, w90p910_ts->ts_reg);
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msleep(1);
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/* set delay and screen type */
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val = __raw_readl(w90p910_ts->ts_reg + 0x04);
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__raw_writel(val & TSC_FOURWIRE, w90p910_ts->ts_reg + 0x04);
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__raw_writel(ADC_DELAY, w90p910_ts->ts_reg + 0x08);
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w90p910_ts->state = TS_WAIT_NEW_PACKET;
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wmb();
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/* set trigger mode */
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val = __raw_readl(w90p910_ts->ts_reg);
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val |= ADC_WAITTRIG | ADC_DIV | ADC_EN | WT_INT_EN;
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__raw_writel(val, w90p910_ts->ts_reg);
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return 0;
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}
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static void w90p910_close(struct input_dev *dev)
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{
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struct w90p910_ts *w90p910_ts = input_get_drvdata(dev);
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unsigned long val;
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/* disable trigger mode */
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spin_lock_irq(&w90p910_ts->lock);
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w90p910_ts->state = TS_IDLE;
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val = __raw_readl(w90p910_ts->ts_reg);
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val &= ~(ADC_WAITTRIG | ADC_DIV | ADC_EN | WT_INT_EN | ADC_INT_EN);
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__raw_writel(val, w90p910_ts->ts_reg);
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spin_unlock_irq(&w90p910_ts->lock);
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/* Now that interrupts are shut off we can safely delete timer */
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del_timer_sync(&w90p910_ts->timer);
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/* stop the ADC clock */
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clk_disable(w90p910_ts->clk);
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}
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static int w90x900ts_probe(struct platform_device *pdev)
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{
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struct w90p910_ts *w90p910_ts;
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struct input_dev *input_dev;
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struct resource *res;
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int err;
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w90p910_ts = kzalloc(sizeof(struct w90p910_ts), GFP_KERNEL);
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input_dev = input_allocate_device();
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if (!w90p910_ts || !input_dev) {
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err = -ENOMEM;
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goto fail1;
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}
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w90p910_ts->input = input_dev;
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w90p910_ts->state = TS_IDLE;
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spin_lock_init(&w90p910_ts->lock);
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setup_timer(&w90p910_ts->timer, w90p910_check_pen_up,
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(unsigned long)w90p910_ts);
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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if (!res) {
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err = -ENXIO;
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goto fail1;
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}
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if (!request_mem_region(res->start, resource_size(res),
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pdev->name)) {
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err = -EBUSY;
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goto fail1;
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}
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w90p910_ts->ts_reg = ioremap(res->start, resource_size(res));
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if (!w90p910_ts->ts_reg) {
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err = -ENOMEM;
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goto fail2;
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}
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w90p910_ts->clk = clk_get(&pdev->dev, NULL);
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if (IS_ERR(w90p910_ts->clk)) {
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err = PTR_ERR(w90p910_ts->clk);
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goto fail3;
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}
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input_dev->name = "W90P910 TouchScreen";
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input_dev->phys = "w90p910ts/event0";
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input_dev->id.bustype = BUS_HOST;
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input_dev->id.vendor = 0x0005;
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input_dev->id.product = 0x0001;
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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->open = w90p910_open;
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input_dev->close = w90p910_close;
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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, 0, 0x400, 0, 0);
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input_set_abs_params(input_dev, ABS_Y, 0, 0x400, 0, 0);
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input_set_drvdata(input_dev, w90p910_ts);
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w90p910_ts->irq_num = platform_get_irq(pdev, 0);
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if (request_irq(w90p910_ts->irq_num, w90p910_ts_interrupt,
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0, "w90p910ts", w90p910_ts)) {
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err = -EBUSY;
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goto fail4;
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}
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err = input_register_device(w90p910_ts->input);
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if (err)
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goto fail5;
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platform_set_drvdata(pdev, w90p910_ts);
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return 0;
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fail5: free_irq(w90p910_ts->irq_num, w90p910_ts);
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fail4: clk_put(w90p910_ts->clk);
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fail3: iounmap(w90p910_ts->ts_reg);
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fail2: release_mem_region(res->start, resource_size(res));
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fail1: input_free_device(input_dev);
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kfree(w90p910_ts);
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return err;
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}
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static int w90x900ts_remove(struct platform_device *pdev)
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{
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struct w90p910_ts *w90p910_ts = platform_get_drvdata(pdev);
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struct resource *res;
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free_irq(w90p910_ts->irq_num, w90p910_ts);
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del_timer_sync(&w90p910_ts->timer);
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iounmap(w90p910_ts->ts_reg);
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clk_put(w90p910_ts->clk);
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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release_mem_region(res->start, resource_size(res));
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input_unregister_device(w90p910_ts->input);
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kfree(w90p910_ts);
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return 0;
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}
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static struct platform_driver w90x900ts_driver = {
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.probe = w90x900ts_probe,
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.remove = w90x900ts_remove,
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.driver = {
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.name = "nuc900-ts",
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.owner = THIS_MODULE,
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},
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};
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module_platform_driver(w90x900ts_driver);
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MODULE_AUTHOR("Wan ZongShun <mcuos.com@gmail.com>");
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MODULE_DESCRIPTION("w90p910 touch screen driver!");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("platform:nuc900-ts");
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