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    Subject[Patch 07/07] Touch: DA9052/53 touch screen driver v1
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    Date
    This driver adds support for DA9052/53 4-wire resistive ADC interfaced
    touchscreen controller.

    DA9052/53 is a MFD therefore this driver depends on DA9052/53 core
    driver for core functionalities.

    This patch is functionally tested on Samsung SMDKV6410.

    Signed-off-by: David Dajun Chen <dchen@diasemi.com>
    Signed-off-by: Ashish Jangam <ashish.jangam@kpitcummins.com>
    ---
    drivers/input/touchscreen/Kconfig | 7 +
    drivers/input/touchscreen/Makefile | 1 +
    drivers/input/touchscreen/da9052_tsi.c | 353 ++++++++++++++++++++++++++++++++
    3 files changed, 361 insertions(+), 0 deletions(-)
    create mode 100644 drivers/input/touchscreen/da9052_tsi.c
    diff --git a/drivers/input/touchscreen/Kconfig b/drivers/input/touchscreen/Kconfig
    index 2b21a70..32a3e26 100644
    --- a/drivers/input/touchscreen/Kconfig
    +++ b/drivers/input/touchscreen/Kconfig
    @@ -187,6 +187,13 @@ config TOUCHSCREEN_DA9034
    Say Y here to enable the support for the touchscreen found
    on Dialog Semiconductor DA9034 PMIC.

    +config TOUCHSCREEN_DA9052
    + tristate "Dialog DA9052/DA9053 TSI"
    + depends on PMIC_DA9052
    + help
    + Say y here to support the touchscreen found on Dialog Semiconductor
    + DA9052-BC and DA9053-AA/Bx PMICs.
    +
    config TOUCHSCREEN_DYNAPRO
    tristate "Dynapro serial touchscreen"
    select SERIO
    diff --git a/drivers/input/touchscreen/Makefile b/drivers/input/touchscreen/Makefile
    index d9acbdc..c76b21c 100644
    --- a/drivers/input/touchscreen/Makefile
    +++ b/drivers/input/touchscreen/Makefile
    @@ -22,6 +22,7 @@ obj-$(CONFIG_TOUCHSCREEN_CYTTSP_CORE) += cyttsp_core.o
    obj-$(CONFIG_TOUCHSCREEN_CYTTSP_I2C) += cyttsp_i2c.o
    obj-$(CONFIG_TOUCHSCREEN_CYTTSP_SPI) += cyttsp_spi.o
    obj-$(CONFIG_TOUCHSCREEN_DA9034) += da9034-ts.o
    +obj-$(CONFIG_TOUCHSCREEN_DA9052) += da9052_tsi.o
    obj-$(CONFIG_TOUCHSCREEN_DYNAPRO) += dynapro.o
    obj-$(CONFIG_TOUCHSCREEN_HAMPSHIRE) += hampshire.o
    obj-$(CONFIG_TOUCHSCREEN_GUNZE) += gunze.o
    diff --git a/drivers/input/touchscreen/da9052_tsi.c b/drivers/input/touchscreen/da9052_tsi.c
    new file mode 100644
    index 0000000..8c672ee
    --- /dev/null
    +++ b/drivers/input/touchscreen/da9052_tsi.c
    @@ -0,0 +1,353 @@
    +/*
    + * TSI driver for Dialog DA9052
    + *
    + * Copyright(c) 2012 Dialog Semiconductor Ltd.
    + *
    + * Author: David Dajun Chen <dchen@diasemi.com>
    + *
    + * This program is free software; you can redistribute it and/or modify it
    + * under the terms of the GNU General Public License as published by the
    + * Free Software Foundation; either version 2 of the License, or (at your
    + * option) any later version.
    + *
    + */
    +#include <linux/module.h>
    +#include <linux/input.h>
    +#include <linux/delay.h>
    +#include <linux/platform_device.h>
    +#include <linux/interrupt.h>
    +
    +#include <linux/mfd/da9052/reg.h>
    +#include <linux/mfd/da9052/da9052.h>
    +
    +#define TSI_PEN_DOWN_STATUS 0x40
    +
    +struct da9052_tsi {
    + struct da9052 *da9052;
    + struct input_dev *dev;
    + struct delayed_work ts_pen_work;
    + int irq_pendwn;
    + int irq_datardy;
    +};
    +
    +static int da9052_ts_start(struct da9052_tsi *tsi)
    +{
    + return da9052_reg_update(tsi->da9052, DA9052_TSI_CONT_A_REG,
    + 1 << 0, 1 << 0);
    +}
    +
    +static int da9052_ts_stop(struct da9052_tsi *tsi)
    +{
    + return da9052_reg_update(tsi->da9052, DA9052_TSI_CONT_A_REG, 1 << 0, 0);
    +}
    +
    +static irqreturn_t da9052_ts_pendwn_irq(int irq, void *data)
    +{
    + struct da9052_tsi *tsi = data;
    +
    + /* Mask PEN_DOWN event and unmask TSI_READY event */
    + disable_irq_nosync(tsi->irq_pendwn);
    + enable_irq(tsi->irq_datardy);
    +
    + da9052_ts_start(tsi);
    +
    + input_report_key(tsi->dev, BTN_TOUCH, 1);
    + input_sync(tsi->dev);
    +
    + schedule_delayed_work(&tsi->ts_pen_work, HZ/50);
    +
    + return IRQ_HANDLED;
    +}
    +
    +static int da9052_ts_read(struct da9052_tsi *tsi)
    +{
    + int ret = 0;
    + u16 x, y, z;
    + u8 v;
    +
    + ret = da9052_reg_read(tsi->da9052, DA9052_TSI_X_MSB_REG);
    + if (ret < 0)
    + goto exit;
    +
    + x = (u16) ret;
    +
    + ret = da9052_reg_read(tsi->da9052, DA9052_TSI_Y_MSB_REG);
    + if (ret < 0)
    + goto exit;
    +
    + y = (u16) ret;
    +
    + ret = da9052_reg_read(tsi->da9052, DA9052_TSI_Z_MSB_REG);
    + if (ret < 0)
    + goto exit;
    +
    + z = (u16) ret;
    +
    + ret = da9052_reg_read(tsi->da9052, DA9052_TSI_LSB_REG);
    + if (ret < 0)
    + goto exit;
    +
    + v = (u8) ret;
    +
    + x = ((x << 2) & 0x3fc) | (v & 0x3);
    + y = ((y << 2) & 0x3fc) | ((v & 0xc) >> 2);
    + z = ((z << 2) & 0x3fc) | ((v & 0x30) >> 4);
    +
    + input_report_abs(tsi->dev, ABS_X, x);
    + input_report_abs(tsi->dev, ABS_Y, y);
    + input_report_abs(tsi->dev, ABS_PRESSURE, z);
    + input_report_key(tsi->dev, BTN_TOUCH, 1);
    + input_sync(tsi->dev);
    +
    +exit:
    + return ret;
    +}
    +
    +static irqreturn_t da9052_ts_datardy_irq(int irq, void *data)
    +{
    + struct da9052_tsi *tsi = data;
    +
    + da9052_ts_read(tsi);
    + return IRQ_HANDLED;
    +}
    +
    +static void da9052_ts_pen_work(struct work_struct *work)
    +{
    + struct da9052_tsi *tsi = container_of(work, struct da9052_tsi,
    + ts_pen_work.work);
    + struct input_dev *ip_dev = tsi->dev;
    + int ret;
    +
    + ret = da9052_reg_read(tsi->da9052, DA9052_TSI_LSB_REG);
    + if (ret < 0)
    + return;
    +
    + if (ret & TSI_PEN_DOWN_STATUS) /* Pen Down */
    + schedule_delayed_work(&tsi->ts_pen_work, HZ/50);
    + else {
    + /* Pen UP */
    + da9052_ts_stop(tsi);
    +
    + /* Mask TSI_READY event and unmask PEN_DOWN event */
    + disable_irq(tsi->irq_datardy);
    + enable_irq(tsi->irq_pendwn);
    +
    + /* Report Pen UP */
    + input_report_abs(ip_dev, ABS_PRESSURE, 0);
    + input_report_key(ip_dev, BTN_TOUCH, 0);
    + input_sync(ip_dev);
    + }
    +}
    +
    +static int __devinit da9052_ts_configure_gpio(struct da9052 *da9052)
    +{
    + int ret;
    +
    + ret = da9052_reg_update(da9052, DA9052_GPIO_2_3_REG, 0x30, 0);
    + if (ret < 0)
    + return ret;
    +
    + ret = da9052_reg_update(da9052, DA9052_GPIO_4_5_REG, 0x33, 0);
    + if (ret < 0)
    + return ret;
    +
    + ret = da9052_reg_update(da9052, DA9052_GPIO_6_7_REG, 0x33, 0);
    +
    + return ret;
    +}
    +
    +static int __devinit da9052_configure_tsi(struct da9052_tsi *tsi)
    +{
    + ssize_t ret;
    +
    + ret = da9052_ts_configure_gpio(tsi->da9052);
    + if (ret < 0)
    + return ret;
    +
    + /* Measure TSI sample every 1ms */
    + ret = da9052_reg_update(tsi->da9052, DA9052_ADC_CONT_REG,
    + 1 << 6, 1 << 6);
    + if (ret < 0)
    + return ret;
    +
    + /* TSI_DELAY: 3 slots, TSI_SKIP: 0 slots, TSI_MODE: XYZP */
    + ret = da9052_reg_update(tsi->da9052, DA9052_TSI_CONT_A_REG, 0xFC, 0xC0);
    + if (ret < 0)
    + return ret;
    +
    + /* Mask PEN_DOWN and TSI_READY events */
    + disable_irq(tsi->irq_pendwn);
    + disable_irq(tsi->irq_datardy);
    +
    + /*Supply TSIRef through LD09 */
    + ret = da9052_reg_write(tsi->da9052, DA9052_LDO9_REG, 0x59);
    +
    + return ret;
    +}
    +
    +static int da9052_ts_input_open(struct input_dev *input_dev)
    +{
    + struct da9052_tsi *tsi = input_get_drvdata(input_dev);
    +
    + /* Unmask PEN_DOWN event */
    + enable_irq(tsi->irq_pendwn);
    +
    + /* Enable Pen Detect Circuit */
    + return da9052_reg_update(tsi->da9052, DA9052_TSI_CONT_A_REG,
    + 1 << 1, 1 << 1);
    +}
    +
    +static void da9052_ts_input_close(struct input_dev *input_dev)
    +{
    + struct da9052_tsi *tsi = input_get_drvdata(input_dev);
    + int ret;
    +
    + ret = da9052_reg_read(tsi->da9052, DA9052_TSI_LSB_REG);
    +
    + if (ret & TSI_PEN_DOWN_STATUS) /* Pen Down */
    + disable_irq(tsi->irq_datardy);
    + else
    + disable_irq(tsi->irq_pendwn);
    +
    + cancel_delayed_work_sync(&tsi->ts_pen_work);
    +
    + da9052_ts_stop(tsi);
    +
    + /* Disable Pen Detect Circuit */
    + da9052_reg_update(tsi->da9052, DA9052_TSI_CONT_A_REG, 1 << 1, 0);
    +}
    +
    +static int __devinit da9052_ts_probe(struct platform_device *pdev)
    +{
    + struct da9052_tsi *tsi;
    + struct input_dev *input_dev;
    + struct da9052 *da9052;
    + int ret;
    +
    + da9052 = dev_get_drvdata(pdev->dev.parent);
    + if (da9052 == NULL)
    + return -EINVAL;
    +
    + tsi = devm_kzalloc(&pdev->dev, sizeof(struct da9052_tsi), GFP_KERNEL);
    + if (!tsi)
    + return -ENOMEM;
    +
    + input_dev = input_allocate_device();
    + if (!input_dev) {
    + dev_err(tsi->da9052->dev, "Failed to allocate input device\n");
    + ret = -ENOMEM;
    + goto err_mem;
    + }
    +
    + INIT_DELAYED_WORK(&tsi->ts_pen_work, da9052_ts_pen_work);
    +
    + tsi->da9052 = da9052;
    +
    + input_dev->id.version = 0x0101;
    + input_dev->id.vendor = 0x15B6;
    + input_dev->id.product = 0x9052;
    + input_dev->name = "Dialog DA9052 TouchScreen Driver";
    + input_dev->dev.parent = &pdev->dev;
    + input_dev->open = da9052_ts_input_open;
    + input_dev->close = da9052_ts_input_close;
    + __set_bit(EV_ABS, input_dev->evbit);
    + __set_bit(EV_KEY, input_dev->evbit);
    + __set_bit(BTN_TOUCH, input_dev->keybit);
    +
    + input_set_abs_params(input_dev, ABS_X, 0, 1023, 0, 0);
    + input_set_abs_params(input_dev, ABS_Y, 0, 1023, 0, 0);
    + input_set_abs_params(input_dev, ABS_PRESSURE, 0, 1023, 0, 0);
    +
    + tsi->dev = input_dev;
    + input_set_drvdata(input_dev, tsi);
    +
    + tsi->irq_pendwn = platform_get_irq_byname(pdev, "PENDWN");
    + if (tsi->irq_pendwn < 0) {
    + ret = tsi->irq_pendwn;
    + goto err_input;
    + }
    +
    + ret = request_threaded_irq(tsi->irq_pendwn, NULL, da9052_ts_pendwn_irq,
    + IRQF_TRIGGER_LOW | IRQF_ONESHOT,
    + "PENDWN", tsi);
    + if (ret < 0) {
    + dev_err(tsi->da9052->dev,
    + "Failed to register %s IRQ %d, error = %d\n", "PENDWN",
    + tsi->irq_pendwn, ret);
    + goto err_input;
    + }
    +
    + tsi->irq_datardy = platform_get_irq_byname(pdev, "TSIRDY");
    + if (tsi->irq_datardy < 0) {
    + ret = tsi->irq_datardy;
    + goto err_pendwn_irq;
    + }
    +
    + ret = request_threaded_irq(tsi->irq_datardy, NULL,
    + da9052_ts_datardy_irq,
    + IRQF_TRIGGER_LOW | IRQF_ONESHOT,
    + "TSIRDY", tsi);
    + if (ret < 0) {
    + dev_err(tsi->da9052->dev,
    + "Failed to register %s IRQ %d, error = %d\n", "TSIRDY",
    + tsi->irq_datardy, ret);
    + goto err_pendwn_irq;
    + }
    +
    + ret = da9052_configure_tsi(tsi);
    + if (ret < 0)
    + goto err_datardy_irq;
    +
    + ret = input_register_device(tsi->dev);
    + if (ret < 0)
    + goto err_datardy_irq;
    +
    + platform_set_drvdata(pdev, tsi);
    +
    + return 0;
    +
    +err_datardy_irq:
    + free_irq(tsi->irq_datardy, tsi);
    +err_pendwn_irq:
    + free_irq(tsi->irq_pendwn, tsi);
    +err_input:
    + input_free_device(input_dev);
    +err_mem:
    + devm_kfree(&pdev->dev, tsi);
    + return ret;
    +}
    +
    +static int __devexit da9052_ts_remove(struct platform_device *pdev)
    +{
    + struct da9052_tsi *tsi = platform_get_drvdata(pdev);
    +
    + da9052_reg_write(tsi->da9052, DA9052_LDO9_REG, 0x19);
    +
    + free_irq(tsi->irq_pendwn, tsi);
    + free_irq(tsi->irq_datardy, tsi);
    +
    + input_unregister_device(tsi->dev);
    +
    + platform_set_drvdata(pdev, NULL);
    +
    + devm_kfree(&pdev->dev, tsi);
    +
    + return 0;
    +}
    +
    +static struct platform_driver da9052_tsi_driver = {
    +
    + .probe = da9052_ts_probe,
    + .remove = __devexit_p(da9052_ts_remove),
    + .driver = {
    + .name = "da9052-tsi",
    + .owner = THIS_MODULE,
    + },
    +};
    +
    +module_platform_driver(da9052_tsi_driver);
    +
    +MODULE_DESCRIPTION("Touchscreen driver for Dialog Semiconductor DA9052");
    +MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>");
    +MODULE_LICENSE("GPL");
    +MODULE_ALIAS("platform:da9052-tsi");



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