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