diff options
Diffstat (limited to 'drivers/input/touchscreen/88pm860x-ts.c')
| -rw-r--r-- | drivers/input/touchscreen/88pm860x-ts.c | 236 |
1 files changed, 236 insertions, 0 deletions
diff --git a/drivers/input/touchscreen/88pm860x-ts.c b/drivers/input/touchscreen/88pm860x-ts.c new file mode 100644 index 000000000000..286bb490a9f2 --- /dev/null +++ b/drivers/input/touchscreen/88pm860x-ts.c @@ -0,0 +1,236 @@ +/* + * 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/platform_device.h> +#include <linux/i2c.h> +#include <linux/input.h> +#include <linux/mfd/88pm860x.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); +} + +static int __devinit pm860x_touch_probe(struct platform_device *pdev) +{ + struct pm860x_chip *chip = dev_get_drvdata(pdev->dev.parent); + struct pm860x_platform_data *pm860x_pdata = \ + pdev->dev.parent->platform_data; + struct pm860x_touch_pdata *pdata = NULL; + struct pm860x_touch *touch; + int irq, ret; + + irq = platform_get_irq(pdev, 0); + if (irq < 0) { + dev_err(&pdev->dev, "No IRQ resource!\n"); + return -EINVAL; + } + + if (!pm860x_pdata) { + dev_err(&pdev->dev, "platform data is missing\n"); + return -EINVAL; + } + + pdata = pm860x_pdata->touch; + if (!pdata) { + dev_err(&pdev->dev, "touchscreen data is missing\n"); + return -EINVAL; + } + + touch = kzalloc(sizeof(struct pm860x_touch), GFP_KERNEL); + if (touch == NULL) + return -ENOMEM; + dev_set_drvdata(&pdev->dev, touch); + + touch->idev = input_allocate_device(); + if (touch->idev == NULL) { + dev_err(&pdev->dev, "Failed to allocate input device!\n"); + ret = -ENOMEM; + goto out; + } + + 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 = (chip->id == CHIP_PM8607) ? chip->client : chip->companion; + touch->irq = irq + chip->irq_base; + touch->res_x = pdata->res_x; + input_set_drvdata(touch->idev, touch); + + ret = request_threaded_irq(touch->irq, NULL, pm860x_touch_handler, + IRQF_ONESHOT, "touch", touch); + if (ret < 0) + goto out_irq; + + __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"); + goto out_rg; + } + + platform_set_drvdata(pdev, touch); + return 0; +out_rg: + free_irq(touch->irq, touch); +out_irq: + input_free_device(touch->idev); +out: + kfree(touch); + return ret; +} + +static int __devexit pm860x_touch_remove(struct platform_device *pdev) +{ + struct pm860x_touch *touch = platform_get_drvdata(pdev); + + input_unregister_device(touch->idev); + free_irq(touch->irq, touch); + platform_set_drvdata(pdev, NULL); + kfree(touch); + return 0; +} + +static struct platform_driver pm860x_touch_driver = { + .driver = { + .name = "88pm860x-touch", + .owner = THIS_MODULE, + }, + .probe = pm860x_touch_probe, + .remove = __devexit_p(pm860x_touch_remove), +}; + +static int __init pm860x_touch_init(void) +{ + return platform_driver_register(&pm860x_touch_driver); +} +module_init(pm860x_touch_init); + +static void __exit pm860x_touch_exit(void) +{ + platform_driver_unregister(&pm860x_touch_driver); +} +module_exit(pm860x_touch_exit); + +MODULE_DESCRIPTION("Touchscreen driver for Marvell Semiconductor 88PM860x"); +MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>"); +MODULE_LICENSE("GPL"); +MODULE_ALIAS("platform:88pm860x-touch"); + |