From 6e29a7271ab22232a2b6dbf7f65c23be47ecad3e Mon Sep 17 00:00:00 2001 From: Haojian Zhuang Date: Thu, 12 Nov 2009 12:15:51 -0500 Subject: [PATCH] input: enable touch on 88pm860x Signed-off-by: Haojian Zhuang --- drivers/input/touchscreen/88pm860x-ts.c | 240 +++++++++++++++++++++++++++++++ drivers/input/touchscreen/Kconfig | 12 ++ drivers/input/touchscreen/Makefile | 1 + include/linux/mfd/88pm860x.h | 1 + 4 files changed, 254 insertions(+), 0 deletions(-) create mode 100644 drivers/input/touchscreen/88pm860x-ts.c diff --git a/drivers/input/touchscreen/88pm860x-ts.c b/drivers/input/touchscreen/88pm860x-ts.c new file mode 100644 index 0000000..4b7564e --- /dev/null +++ b/drivers/input/touchscreen/88pm860x-ts.c @@ -0,0 +1,240 @@ +/* + * Touchscreen driver for Marvell 88PM860x + * + * Copyright (C) 2009 Marvell International Ltd. + * Haojian Zhuang + * + * 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 +#include +#include +#include +#include + +#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 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; + + pm860x_mask_irq(chip, irq); + ret = pm860x_bulk_read(chip->parent, DESC_8607, 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); + } else { + input_report_abs(touch->idev, ABS_PRESSURE, 0); + input_report_key(touch->idev, BTN_TOUCH, 0); + } + input_sync(touch->idev); + pm860x_unmask_irq(chip, irq); + + if (pen_down) + dev_dbg(chip->dev, "pen down at [%d, %d].\n", x, y); + else + dev_dbg(chip->dev, "pen release\n"); +out: + return IRQ_HANDLED; +} + +static int pm860x_touch_open(struct input_dev *dev) +{ + struct pm860x_touch *touch = input_get_drvdata(dev); + struct pm860x_chip *chip = touch->chip; + int data, ret; + + data = MEAS_PD_EN | MEAS_TSIX_EN | MEAS_TSIY_EN + | MEAS_TSIZ1_EN | MEAS_TSIZ2_EN; + ret = pm860x_set_bits(chip->parent, DESC_8607, MEAS_EN3, + data, data); + if (ret < 0) + goto out; + pm860x_unmask_irq(chip, touch->irq); + return 0; +out: + return ret; +} + +static void pm860x_touch_close(struct input_dev *dev) +{ + struct pm860x_touch *touch = input_get_drvdata(dev); + struct pm860x_chip *chip = touch->chip; + int data; + + data = MEAS_PD_EN | MEAS_TSIX_EN | MEAS_TSIY_EN + | MEAS_TSIZ1_EN | MEAS_TSIZ2_EN; + pm860x_set_bits(chip->parent, DESC_8607, MEAS_EN3, + data, 0); + pm860x_mask_irq(chip, touch->irq); +} + +static int __devinit pm860x_touch_probe(struct platform_device *pdev) +{ + struct pm860x_chip *chip = dev_get_drvdata(pdev->dev.parent); + struct pm860x_plat_data *pm860x_pdata; + struct pm860x_touch_pdata *pdata; + 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 (pdev->dev.parent->platform_data) { + pm860x_pdata = pdev->dev.parent->platform_data; + pdata = pm860x_pdata->touch; + } else + pdata = NULL; + + if (pdata == NULL) { + dev_err(&pdev->dev, "platform data isn't assigned to " + "touch\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->irq = irq; + touch->res_x = pdata->res_x; + input_set_drvdata(touch->idev, touch); + + ret = pm860x_request_irq(chip, irq, pm860x_touch_handler, 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: + pm860x_free_irq(chip, irq); +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); + pm860x_free_irq(chip, irq); + 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 "); +MODULE_LICENSE("GPL"); +MODULE_ALIAS("platform:88pm860x-touch"); diff --git a/drivers/input/touchscreen/Kconfig b/drivers/input/touchscreen/Kconfig index 8cc453c..f4e6fd2 100644 --- a/drivers/input/touchscreen/Kconfig +++ b/drivers/input/touchscreen/Kconfig @@ -530,4 +530,16 @@ config TOUCHSCREEN_PCAP To compile this driver as a module, choose M here: the module will be called pcap_ts. + +config TOUCHSCREEN_88PM860X + tristate "Marvell 88PM860x touchscreen" + depends on MFD_88PM860X + help + Say Y here if you have a 88PM860x PMIC and want to enable + support for the built-in touchscreen. + + If unsure, say N. + + To compile this driver as a module, choose M here: the + module will be called 88pm860x-ts. endif diff --git a/drivers/input/touchscreen/Makefile b/drivers/input/touchscreen/Makefile index 15fa62c..b278a1f 100644 --- a/drivers/input/touchscreen/Makefile +++ b/drivers/input/touchscreen/Makefile @@ -6,6 +6,7 @@ wm97xx-ts-y := wm97xx-core.o +obj-$(CONFIG_TOUCHSCREEN_88PM860X) += 88pm860x-ts.o obj-$(CONFIG_TOUCHSCREEN_AD7877) += ad7877.o obj-$(CONFIG_TOUCHSCREEN_AD7879) += ad7879.o obj-$(CONFIG_TOUCHSCREEN_ADS7846) += ads7846.o diff --git a/include/linux/mfd/88pm860x.h b/include/linux/mfd/88pm860x.h index d8c1d30..791bfa2 100644 --- a/include/linux/mfd/88pm860x.h +++ b/include/linux/mfd/88pm860x.h @@ -354,6 +354,7 @@ struct pm860x_touch_pdata { int tsi_prebias; /* time, slot */ int pen_prebias; /* time, slot */ int pen_prechg; /* time, slot */ + int res_x; /* resistor of Xplate */ unsigned long flags; }; -- 1.5.6.5