| /* |
| * 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); |
| } |
| |
| 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; |
| } |
| |
| 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; |
| } |
| |
| 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; |
| } |
| |
| 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; |
| } |
| |
| 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); |
| } |
| |
| 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; |
| } |
| |
| 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); |
| } |
| |
| 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; |
| } |
| |
| 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); |
| |
| platform_set_drvdata(pdev, NULL); |
| |
| return 0; |
| } |
| |
| static struct platform_driver w90x900ts_driver = { |
| .probe = w90x900ts_probe, |
| .remove = w90x900ts_remove, |
| .driver = { |
| .name = "nuc900-ts", |
| .owner = THIS_MODULE, |
| }, |
| }; |
| 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"); |