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304 lines
8.1 KiB
304 lines
8.1 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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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 <[email protected]> |
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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_get_child_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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goto err_put_node; |
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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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goto err_put_node; |
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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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goto err_put_node; |
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} |
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of_property_read_u32(np, "marvell,88pm860x-resistor-X", res_x); |
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of_node_put(np); |
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return 0; |
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err_put_node: |
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of_node_put(np); |
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return -EINVAL; |
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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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return -EINVAL; |
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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 <[email protected]>"); |
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MODULE_LICENSE("GPL"); |
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MODULE_ALIAS("platform:88pm860x-touch"); |
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