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Release 4.11 drivers/input/touchscreen/w90p910_ts.c

/*
 * Copyright (c) 2008 Nuvoton technology corporation.
 *
 * Wan ZongShun <mcuos.com@gmail.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation;version 2 of the License.
 *
 */

#include <linux/delay.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/io.h>
#include <linux/clk.h>
#include <linux/input.h>
#include <linux/interrupt.h>
#include <linux/slab.h>

/* ADC controller bit defines */

#define ADC_DELAY	0xf00

#define ADC_DOWN	0x01

#define ADC_TSC_Y	(0x01 << 8)

#define ADC_TSC_X	(0x00 << 8)

#define TSC_FOURWIRE	(~(0x03 << 1))

#define ADC_CLK_EN	(0x01 << 28)	
/* ADC clock enable */

#define ADC_READ_CON	(0x01 << 12)

#define ADC_CONV	(0x01 << 13)

#define ADC_SEMIAUTO	(0x01 << 14)

#define ADC_WAITTRIG	(0x03 << 14)

#define ADC_RST1	(0x01 << 16)

#define ADC_RST0	(0x00 << 16)

#define ADC_EN		(0x01 << 17)

#define ADC_INT		(0x01 << 18)

#define WT_INT		(0x01 << 20)

#define ADC_INT_EN	(0x01 << 21)

#define LVD_INT_EN	(0x01 << 22)

#define WT_INT_EN	(0x01 << 23)

#define ADC_DIV		(0x04 << 1)	
/* div = 6 */


enum ts_state {
	
TS_WAIT_NEW_PACKET,	/* We are waiting next touch report */
	
TS_WAIT_X_COORD,	/* We are waiting for ADC to report X coord */
	
TS_WAIT_Y_COORD,	/* We are waiting for ADC to report Y coord */
	
TS_IDLE,		/* Input device is closed, don't do anything */
};


struct w90p910_ts {
	
struct input_dev *input;
	
struct timer_list timer;
	
struct clk *clk;
	
int irq_num;
	
void __iomem *ts_reg;
	
spinlock_t lock;
	
enum ts_state state;
};


static void w90p910_report_event(struct w90p910_ts *w90p910_ts, bool down) { struct input_dev *dev = w90p910_ts->input; if (down) { input_report_abs(dev, ABS_X, __raw_readl(w90p910_ts->ts_reg + 0x0c)); input_report_abs(dev, ABS_Y, __raw_readl(w90p910_ts->ts_reg + 0x10)); } input_report_key(dev, BTN_TOUCH, down); input_sync(dev); }

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Wan ZongShun75100.00%1100.00%
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static void w90p910_prepare_x_reading(struct w90p910_ts *w90p910_ts) { unsigned long ctlreg; __raw_writel(ADC_TSC_X, w90p910_ts->ts_reg + 0x04); ctlreg = __raw_readl(w90p910_ts->ts_reg); ctlreg &= ~(ADC_WAITTRIG | WT_INT | WT_INT_EN); ctlreg |= ADC_SEMIAUTO | ADC_INT_EN | ADC_CONV; __raw_writel(ctlreg, w90p910_ts->ts_reg); w90p910_ts->state = TS_WAIT_X_COORD; }

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static void w90p910_prepare_y_reading(struct w90p910_ts *w90p910_ts) { unsigned long ctlreg; __raw_writel(ADC_TSC_Y, w90p910_ts->ts_reg + 0x04); ctlreg = __raw_readl(w90p910_ts->ts_reg); ctlreg &= ~(ADC_WAITTRIG | ADC_INT | WT_INT_EN); ctlreg |= ADC_SEMIAUTO | ADC_INT_EN | ADC_CONV; __raw_writel(ctlreg, w90p910_ts->ts_reg); w90p910_ts->state = TS_WAIT_Y_COORD; }

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static void w90p910_prepare_next_packet(struct w90p910_ts *w90p910_ts) { unsigned long ctlreg; ctlreg = __raw_readl(w90p910_ts->ts_reg); ctlreg &= ~(ADC_INT | ADC_INT_EN | ADC_SEMIAUTO | ADC_CONV); ctlreg |= ADC_WAITTRIG | WT_INT_EN; __raw_writel(ctlreg, w90p910_ts->ts_reg); w90p910_ts->state = TS_WAIT_NEW_PACKET; }

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static irqreturn_t w90p910_ts_interrupt(int irq, void *dev_id) { struct w90p910_ts *w90p910_ts = dev_id; unsigned long flags; spin_lock_irqsave(&w90p910_ts->lock, flags); switch (w90p910_ts->state) { case TS_WAIT_NEW_PACKET: /* * The controller only generates interrupts when pen * is down. */ del_timer(&w90p910_ts->timer); w90p910_prepare_x_reading(w90p910_ts); break; case TS_WAIT_X_COORD: w90p910_prepare_y_reading(w90p910_ts); break; case TS_WAIT_Y_COORD: w90p910_report_event(w90p910_ts, true); w90p910_prepare_next_packet(w90p910_ts); mod_timer(&w90p910_ts->timer, jiffies + msecs_to_jiffies(100)); break; case TS_IDLE: break; } spin_unlock_irqrestore(&w90p910_ts->lock, flags); return IRQ_HANDLED; }

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static void w90p910_check_pen_up(unsigned long data) { struct w90p910_ts *w90p910_ts = (struct w90p910_ts *) data; unsigned long flags; spin_lock_irqsave(&w90p910_ts->lock, flags); if (w90p910_ts->state == TS_WAIT_NEW_PACKET && !(__raw_readl(w90p910_ts->ts_reg + 0x04) & ADC_DOWN)) { w90p910_report_event(w90p910_ts, false); } spin_unlock_irqrestore(&w90p910_ts->lock, flags); }

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static int w90p910_open(struct input_dev *dev) { struct w90p910_ts *w90p910_ts = input_get_drvdata(dev); unsigned long val; /* enable the ADC clock */ clk_enable(w90p910_ts->clk); __raw_writel(ADC_RST1, w90p910_ts->ts_reg); msleep(1); __raw_writel(ADC_RST0, w90p910_ts->ts_reg); msleep(1); /* set delay and screen type */ val = __raw_readl(w90p910_ts->ts_reg + 0x04); __raw_writel(val & TSC_FOURWIRE, w90p910_ts->ts_reg + 0x04); __raw_writel(ADC_DELAY, w90p910_ts->ts_reg + 0x08); w90p910_ts->state = TS_WAIT_NEW_PACKET; wmb(); /* set trigger mode */ val = __raw_readl(w90p910_ts->ts_reg); val |= ADC_WAITTRIG | ADC_DIV | ADC_EN | WT_INT_EN; __raw_writel(val, w90p910_ts->ts_reg); return 0; }

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Wan ZongShun138100.00%2100.00%
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static void w90p910_close(struct input_dev *dev) { struct w90p910_ts *w90p910_ts = input_get_drvdata(dev); unsigned long val; /* disable trigger mode */ spin_lock_irq(&w90p910_ts->lock); w90p910_ts->state = TS_IDLE; val = __raw_readl(w90p910_ts->ts_reg); val &= ~(ADC_WAITTRIG | ADC_DIV | ADC_EN | WT_INT_EN | ADC_INT_EN); __raw_writel(val, w90p910_ts->ts_reg); spin_unlock_irq(&w90p910_ts->lock); /* Now that interrupts are shut off we can safely delete timer */ del_timer_sync(&w90p910_ts->timer); /* stop the ADC clock */ clk_disable(w90p910_ts->clk); }

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static int w90x900ts_probe(struct platform_device *pdev) { struct w90p910_ts *w90p910_ts; struct input_dev *input_dev; struct resource *res; int err; w90p910_ts = kzalloc(sizeof(struct w90p910_ts), GFP_KERNEL); input_dev = input_allocate_device(); if (!w90p910_ts || !input_dev) { err = -ENOMEM; goto fail1; } w90p910_ts->input = input_dev; w90p910_ts->state = TS_IDLE; spin_lock_init(&w90p910_ts->lock); setup_timer(&w90p910_ts->timer, w90p910_check_pen_up, (unsigned long)w90p910_ts); res = platform_get_resource(pdev, IORESOURCE_MEM, 0); if (!res) { err = -ENXIO; goto fail1; } if (!request_mem_region(res->start, resource_size(res), pdev->name)) { err = -EBUSY; goto fail1; } w90p910_ts->ts_reg = ioremap(res->start, resource_size(res)); if (!w90p910_ts->ts_reg) { err = -ENOMEM; goto fail2; } w90p910_ts->clk = clk_get(&pdev->dev, NULL); if (IS_ERR(w90p910_ts->clk)) { err = PTR_ERR(w90p910_ts->clk); goto fail3; } input_dev->name = "W90P910 TouchScreen"; input_dev->phys = "w90p910ts/event0"; input_dev->id.bustype = BUS_HOST; input_dev->id.vendor = 0x0005; input_dev->id.product = 0x0001; input_dev->id.version = 0x0100; input_dev->dev.parent = &pdev->dev; input_dev->open = w90p910_open; input_dev->close = w90p910_close; input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS); input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH); input_set_abs_params(input_dev, ABS_X, 0, 0x400, 0, 0); input_set_abs_params(input_dev, ABS_Y, 0, 0x400, 0, 0); input_set_drvdata(input_dev, w90p910_ts); w90p910_ts->irq_num = platform_get_irq(pdev, 0); if (request_irq(w90p910_ts->irq_num, w90p910_ts_interrupt, 0, "w90p910ts", w90p910_ts)) { err = -EBUSY; goto fail4; } err = input_register_device(w90p910_ts->input); if (err) goto fail5; platform_set_drvdata(pdev, w90p910_ts); return 0; fail5: free_irq(w90p910_ts->irq_num, w90p910_ts); fail4: clk_put(w90p910_ts->clk); fail3: iounmap(w90p910_ts->ts_reg); fail2: release_mem_region(res->start, resource_size(res)); fail1: input_free_device(input_dev); kfree(w90p910_ts); return err; }

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Wan ZongShun47497.93%250.00%
Julia Lawall91.86%125.00%
Yong Zhang10.21%125.00%
Total484100.00%4100.00%


static int w90x900ts_remove(struct platform_device *pdev) { struct w90p910_ts *w90p910_ts = platform_get_drvdata(pdev); struct resource *res; free_irq(w90p910_ts->irq_num, w90p910_ts); del_timer_sync(&w90p910_ts->timer); iounmap(w90p910_ts->ts_reg); clk_put(w90p910_ts->clk); res = platform_get_resource(pdev, IORESOURCE_MEM, 0); release_mem_region(res->start, resource_size(res)); input_unregister_device(w90p910_ts->input); kfree(w90p910_ts); return 0; }

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Wan ZongShun9296.84%266.67%
Julia Lawall33.16%133.33%
Total95100.00%3100.00%

static struct platform_driver w90x900ts_driver = { .probe = w90x900ts_probe, .remove = w90x900ts_remove, .driver = { .name = "nuc900-ts", }, }; module_platform_driver(w90x900ts_driver); MODULE_AUTHOR("Wan ZongShun <mcuos.com@gmail.com>"); MODULE_DESCRIPTION("w90p910 touch screen driver!"); MODULE_LICENSE("GPL"); MODULE_ALIAS("platform:nuc900-ts");

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Wan ZongShun146998.79%342.86%
Julia Lawall120.81%114.29%
Tejun Heo30.20%114.29%
JJ Ding20.13%114.29%
Yong Zhang10.07%114.29%
Total1487100.00%7100.00%
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