302 lines
8.2 KiB
C
302 lines
8.2 KiB
C
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/*
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* Touchscreen driver for Marvell 88PM860x
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*
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* Copyright (C) 2009 Marvell International Ltd.
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* Haojian Zhuang <haojian.zhuang@marvell.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 version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/platform_device.h>
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#include <linux/i2c.h>
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#include <linux/input.h>
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#include <linux/mfd/88pm860x.h>
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#include <linux/slab.h>
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#include <linux/device.h>
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#define MEAS_LEN (8)
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#define ACCURATE_BIT (12)
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/* touch register */
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#define MEAS_EN3 (0x52)
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#define MEAS_TSIX_1 (0x8D)
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#define MEAS_TSIX_2 (0x8E)
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#define MEAS_TSIY_1 (0x8F)
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#define MEAS_TSIY_2 (0x90)
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#define MEAS_TSIZ1_1 (0x91)
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#define MEAS_TSIZ1_2 (0x92)
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#define MEAS_TSIZ2_1 (0x93)
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#define MEAS_TSIZ2_2 (0x94)
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/* bit definitions of touch */
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#define MEAS_PD_EN (1 << 3)
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#define MEAS_TSIX_EN (1 << 4)
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#define MEAS_TSIY_EN (1 << 5)
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#define MEAS_TSIZ1_EN (1 << 6)
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#define MEAS_TSIZ2_EN (1 << 7)
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struct pm860x_touch {
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struct input_dev *idev;
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struct i2c_client *i2c;
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struct pm860x_chip *chip;
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int irq;
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int res_x; /* resistor of Xplate */
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};
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static irqreturn_t pm860x_touch_handler(int irq, void *data)
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{
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struct pm860x_touch *touch = data;
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struct pm860x_chip *chip = touch->chip;
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unsigned char buf[MEAS_LEN];
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int x, y, pen_down;
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int z1, z2, rt = 0;
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int ret;
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ret = pm860x_bulk_read(touch->i2c, MEAS_TSIX_1, MEAS_LEN, buf);
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if (ret < 0)
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goto out;
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pen_down = buf[1] & (1 << 6);
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x = ((buf[0] & 0xFF) << 4) | (buf[1] & 0x0F);
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y = ((buf[2] & 0xFF) << 4) | (buf[3] & 0x0F);
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z1 = ((buf[4] & 0xFF) << 4) | (buf[5] & 0x0F);
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z2 = ((buf[6] & 0xFF) << 4) | (buf[7] & 0x0F);
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if (pen_down) {
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if ((x != 0) && (z1 != 0) && (touch->res_x != 0)) {
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rt = z2 / z1 - 1;
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rt = (rt * touch->res_x * x) >> ACCURATE_BIT;
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dev_dbg(chip->dev, "z1:%d, z2:%d, rt:%d\n",
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z1, z2, rt);
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}
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input_report_abs(touch->idev, ABS_X, x);
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input_report_abs(touch->idev, ABS_Y, y);
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input_report_abs(touch->idev, ABS_PRESSURE, rt);
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input_report_key(touch->idev, BTN_TOUCH, 1);
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dev_dbg(chip->dev, "pen down at [%d, %d].\n", x, y);
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} else {
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input_report_abs(touch->idev, ABS_PRESSURE, 0);
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input_report_key(touch->idev, BTN_TOUCH, 0);
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dev_dbg(chip->dev, "pen release\n");
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}
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input_sync(touch->idev);
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out:
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return IRQ_HANDLED;
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}
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static int pm860x_touch_open(struct input_dev *dev)
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{
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struct pm860x_touch *touch = input_get_drvdata(dev);
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int data, ret;
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data = MEAS_PD_EN | MEAS_TSIX_EN | MEAS_TSIY_EN
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| MEAS_TSIZ1_EN | MEAS_TSIZ2_EN;
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ret = pm860x_set_bits(touch->i2c, MEAS_EN3, data, data);
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if (ret < 0)
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goto out;
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return 0;
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out:
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return ret;
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}
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static void pm860x_touch_close(struct input_dev *dev)
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{
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struct pm860x_touch *touch = input_get_drvdata(dev);
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int data;
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data = MEAS_PD_EN | MEAS_TSIX_EN | MEAS_TSIY_EN
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| MEAS_TSIZ1_EN | MEAS_TSIZ2_EN;
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pm860x_set_bits(touch->i2c, MEAS_EN3, data, 0);
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}
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#ifdef CONFIG_OF
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static int pm860x_touch_dt_init(struct platform_device *pdev,
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struct pm860x_chip *chip,
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int *res_x)
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{
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struct device_node *np = pdev->dev.parent->of_node;
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struct i2c_client *i2c = (chip->id == CHIP_PM8607) ? chip->client \
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: chip->companion;
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int data, n, ret;
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if (!np)
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return -ENODEV;
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np = of_find_node_by_name(np, "touch");
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if (!np) {
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dev_err(&pdev->dev, "Can't find touch node\n");
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return -EINVAL;
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}
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/* set GPADC MISC1 register */
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data = 0;
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if (!of_property_read_u32(np, "marvell,88pm860x-gpadc-prebias", &n))
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data |= (n << 1) & PM8607_GPADC_PREBIAS_MASK;
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if (!of_property_read_u32(np, "marvell,88pm860x-gpadc-slot-cycle", &n))
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data |= (n << 3) & PM8607_GPADC_SLOT_CYCLE_MASK;
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if (!of_property_read_u32(np, "marvell,88pm860x-gpadc-off-scale", &n))
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data |= (n << 5) & PM8607_GPADC_OFF_SCALE_MASK;
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if (!of_property_read_u32(np, "marvell,88pm860x-gpadc-sw-cal", &n))
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data |= (n << 7) & PM8607_GPADC_SW_CAL_MASK;
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if (data) {
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ret = pm860x_reg_write(i2c, PM8607_GPADC_MISC1, data);
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if (ret < 0)
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return -EINVAL;
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}
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/* set tsi prebias time */
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if (!of_property_read_u32(np, "marvell,88pm860x-tsi-prebias", &data)) {
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ret = pm860x_reg_write(i2c, PM8607_TSI_PREBIAS, data);
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if (ret < 0)
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return -EINVAL;
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}
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/* set prebias & prechg time of pen detect */
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data = 0;
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if (!of_property_read_u32(np, "marvell,88pm860x-pen-prebias", &n))
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data |= n & PM8607_PD_PREBIAS_MASK;
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if (!of_property_read_u32(np, "marvell,88pm860x-pen-prechg", &n))
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data |= n & PM8607_PD_PRECHG_MASK;
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if (data) {
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ret = pm860x_reg_write(i2c, PM8607_PD_PREBIAS, data);
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if (ret < 0)
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return -EINVAL;
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}
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of_property_read_u32(np, "marvell,88pm860x-resistor-X", res_x);
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return 0;
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}
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#else
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#define pm860x_touch_dt_init(x, y, z) (-1)
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#endif
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static int pm860x_touch_probe(struct platform_device *pdev)
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{
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struct pm860x_chip *chip = dev_get_drvdata(pdev->dev.parent);
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struct pm860x_touch_pdata *pdata = dev_get_platdata(&pdev->dev);
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struct pm860x_touch *touch;
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struct i2c_client *i2c = (chip->id == CHIP_PM8607) ? chip->client \
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: chip->companion;
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int irq, ret, res_x = 0, data = 0;
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irq = platform_get_irq(pdev, 0);
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if (irq < 0) {
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dev_err(&pdev->dev, "No IRQ resource!\n");
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return -EINVAL;
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}
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if (pm860x_touch_dt_init(pdev, chip, &res_x)) {
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if (pdata) {
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/* set GPADC MISC1 register */
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data = 0;
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data |= (pdata->gpadc_prebias << 1)
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& PM8607_GPADC_PREBIAS_MASK;
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data |= (pdata->slot_cycle << 3)
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& PM8607_GPADC_SLOT_CYCLE_MASK;
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data |= (pdata->off_scale << 5)
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& PM8607_GPADC_OFF_SCALE_MASK;
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data |= (pdata->sw_cal << 7)
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& PM8607_GPADC_SW_CAL_MASK;
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if (data) {
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ret = pm860x_reg_write(i2c,
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PM8607_GPADC_MISC1, data);
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if (ret < 0)
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return -EINVAL;
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}
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/* set tsi prebias time */
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if (pdata->tsi_prebias) {
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data = pdata->tsi_prebias;
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ret = pm860x_reg_write(i2c,
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PM8607_TSI_PREBIAS, data);
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if (ret < 0)
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return -EINVAL;
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}
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/* set prebias & prechg time of pen detect */
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data = 0;
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data |= pdata->pen_prebias
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& PM8607_PD_PREBIAS_MASK;
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data |= (pdata->pen_prechg << 5)
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& PM8607_PD_PRECHG_MASK;
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if (data) {
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ret = pm860x_reg_write(i2c,
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PM8607_PD_PREBIAS, data);
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if (ret < 0)
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return -EINVAL;
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}
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res_x = pdata->res_x;
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} else {
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dev_err(&pdev->dev, "failed to get platform data\n");
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return -EINVAL;
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}
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}
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/* enable GPADC */
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ret = pm860x_set_bits(i2c, PM8607_GPADC_MISC1, PM8607_GPADC_EN,
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PM8607_GPADC_EN);
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if (ret)
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return ret;
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touch = devm_kzalloc(&pdev->dev, sizeof(struct pm860x_touch),
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GFP_KERNEL);
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if (!touch)
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return -ENOMEM;
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touch->idev = devm_input_allocate_device(&pdev->dev);
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if (!touch->idev) {
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dev_err(&pdev->dev, "Failed to allocate input device!\n");
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return -ENOMEM;
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}
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touch->idev->name = "88pm860x-touch";
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touch->idev->phys = "88pm860x/input0";
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touch->idev->id.bustype = BUS_I2C;
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touch->idev->dev.parent = &pdev->dev;
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touch->idev->open = pm860x_touch_open;
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touch->idev->close = pm860x_touch_close;
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touch->chip = chip;
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touch->i2c = i2c;
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touch->irq = irq;
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touch->res_x = res_x;
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input_set_drvdata(touch->idev, touch);
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ret = devm_request_threaded_irq(&pdev->dev, touch->irq, NULL,
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pm860x_touch_handler, IRQF_ONESHOT,
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"touch", touch);
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if (ret < 0)
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return ret;
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__set_bit(EV_ABS, touch->idev->evbit);
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__set_bit(ABS_X, touch->idev->absbit);
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__set_bit(ABS_Y, touch->idev->absbit);
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__set_bit(ABS_PRESSURE, touch->idev->absbit);
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__set_bit(EV_SYN, touch->idev->evbit);
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__set_bit(EV_KEY, touch->idev->evbit);
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__set_bit(BTN_TOUCH, touch->idev->keybit);
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input_set_abs_params(touch->idev, ABS_X, 0, 1 << ACCURATE_BIT, 0, 0);
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input_set_abs_params(touch->idev, ABS_Y, 0, 1 << ACCURATE_BIT, 0, 0);
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input_set_abs_params(touch->idev, ABS_PRESSURE, 0, 1 << ACCURATE_BIT,
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0, 0);
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ret = input_register_device(touch->idev);
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if (ret < 0) {
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dev_err(chip->dev, "Failed to register touch!\n");
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return ret;
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}
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return 0;
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}
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static struct platform_driver pm860x_touch_driver = {
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.driver = {
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.name = "88pm860x-touch",
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},
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.probe = pm860x_touch_probe,
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};
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module_platform_driver(pm860x_touch_driver);
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MODULE_DESCRIPTION("Touchscreen driver for Marvell Semiconductor 88PM860x");
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MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("platform:88pm860x-touch");
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