+++ /dev/null
-// SPDX-License-Identifier: GPL-2.0-only
-/*
- * Copyright (c) 2008 Nuvoton technology corporation.
- *
- * Wan ZongShun <mcuos.com@gmail.com>
- */
-
-#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(struct timer_list *t)
-{
- struct w90p910_ts *w90p910_ts = from_timer(w90p910_ts, t, timer);
- 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);
- timer_setup(&w90p910_ts->timer, w90p910_check_pen_up, 0);
-
- 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);
-
- return 0;
-}
-
-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");
projects / mirror_ubuntu-hirsute-kernel.git / commitdiff