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Message-ID: <20110929080313.GA23127@core.coreip.homeip.net>
Date: Thu, 29 Sep 2011 01:03:13 -0700
From: Dmitry Torokhov <dmitry.torokhov@...il.com>
To: ashishj3 <ashish.jangam@...tcummins.com>
Cc: sameo@...ux.intel.com, m.grzeschik@...gutronix.de,
linaro-dev@...ts.linaro.org, linux-kernel@...r.kernel.org,
Mark Brown <broonie@...nsource.wolfsonmicro.com>,
Dajun <dajun.chen@...semi.com>
Subject: Re: [Patch v4 08/11] Touch: DA9052 touchscreen driver
On Thu, Sep 29, 2011 at 11:52:29AM +0530, ashishj3 wrote:
> This driver add support for DA9052 4-wire resistive ADC interfaced touchscreen
> controller.
>
> DA9052 is a MFD therefore this driver depends on DA9052 core driver for core
> functionalities.
>
> Signed-off-by: David Dajun Chen <dchen@...semi.com>
> Signed-off-by: Ashish Jangam <ashish.jangam@...tcummins.com>
Acked-by: Dmitry Torokhov <dtor@...l.ru>
Please feel free to merge with the rest of your patches (I assume
through MFD tree).
Thanks.
> ---
> Changes since v4:
> - Add string "compile this driver as module" in kconfig
> - Replace struct da9052_tsi_reg with temp variable
> - Call schedule_delayed_work() from pen down irq handler
> - Mask data ready irq in pen up work
> - Disable IRQs in device close and enable it in device open
> - Remove set_bit() for ABS X,Y,Pressure as input_set_abs_params() does it
> Changes since v3:
> - Remove unrequire type cast
> - Prefix init code with _devinit
> - Remove check for workqueue reschedule
> - tsi_close() to wait for datardy intr completion
> - Remove seperate workqueue
> - Move cancel_work_sync to tsi_close()
> - Check for drv data before tsi priv data allocation
> Changes since v2:
> - Replace kthreads with workqueue
> - Remove kfifos
> - Taken care for bus type
> - Replace da9052_set/clear function with da9052_reg_update
> - Add open and close functionality
> ---
> drivers/input/touchscreen/Kconfig | 10 +
> drivers/input/touchscreen/Makefile | 1 +
> drivers/input/touchscreen/da9052_tsi.c | 374 ++++++++++++++++++++++++++++++++
> 3 files changed, 385 insertions(+), 0 deletions(-)
> create mode 100755 drivers/input/touchscreen/da9052_tsi.c
> diff --git a/drivers/input/touchscreen/Kconfig b/drivers/input/touchscreen/Kconfig
> index cabd9e5..e4e3341 100644
> --- a/drivers/input/touchscreen/Kconfig
> +++ b/drivers/input/touchscreen/Kconfig
> @@ -144,6 +144,16 @@ 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 TSI"
> + depends on PMIC_DA9052
> + help
> + Say y here to support the touchscreen found on
> + Dialog Semiconductor DA9052 PMIC
> +
> + To compile this driver as a module, choose M here: the
> + module will be called da9052-tsi.
> +
> config TOUCHSCREEN_DYNAPRO
> tristate "Dynapro serial touchscreen"
> select SERIO
> diff --git a/drivers/input/touchscreen/Makefile b/drivers/input/touchscreen/Makefile
> index 282d6f7..a4aeb25 100644
> --- a/drivers/input/touchscreen/Makefile
> +++ b/drivers/input/touchscreen/Makefile
> @@ -18,6 +18,7 @@ obj-$(CONFIG_TOUCHSCREEN_BITSY) += h3600_ts_input.o
> obj-$(CONFIG_TOUCHSCREEN_BU21013) += bu21013_ts.o
> obj-$(CONFIG_TOUCHSCREEN_CY8CTMG110) += cy8ctmg110_ts.o
> obj-$(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 100755
> index 0000000..e7418b3
> --- /dev/null
> +++ b/drivers/input/touchscreen/da9052_tsi.c
> @@ -0,0 +1,374 @@
> +/*
> + * TSI driver for Dialog DA9052
> + *
> + * Copyright(c) 2011 Dialog Semiconductor Ltd.
> + *
> + * Author: David Dajun Chen <dchen@...semi.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/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;
> + struct da9052 *da9052 = tsi->da9052;
> + int ret;
> +
> + /* Mask PEN_DOWN event and unmask TSI_READY event */
> + da9052->events_mask |= DA9052_E_PEN_DOWN;
> + da9052->events_mask &= ~DA9052_E_TSI_READY;
> + ret = da9052_reg_update(da9052, DA9052_IRQ_MASK_B_REG, 0x80, 0x40);
> + if (ret < 0)
> + return IRQ_NONE;
> +
> + 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;
> + struct da9052 *da9052 = tsi->da9052;
> + 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 */
> + da9052->events_mask |= DA9052_E_TSI_READY;
> + da9052->events_mask &= ~DA9052_E_PEN_DOWN;
> + da9052_reg_update(da9052, DA9052_IRQ_MASK_B_REG, 0x40, 0x80);
> +
> + /* 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;
> + struct da9052 *da9052 = tsi->da9052;
> +
> + 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 */
> + da9052->events_mask |= DA9052_E_PEN_DOWN | DA9052_E_TSI_READY;
> + ret = da9052_reg_update(da9052, DA9052_IRQ_MASK_B_REG, 0, 0xc0);
> + if (ret < 0)
> + return ret;
> +
> + /*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);
> + int ret;
> +
> + /* Unmask PEN_DOWN and TSI_READY events */
> + tsi->da9052->events_mask &= ~(DA9052_E_PEN_DOWN | DA9052_E_TSI_READY);
> + ret = da9052_reg_update(tsi->da9052, DA9052_IRQ_MASK_B_REG, 0xc0, 0);
> + if (ret < 0)
> + return ret;
> +
> + /* 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);
> +
> + /* Mask PEN_DOWN and TSI_READY events */
> + tsi->da9052->events_mask |= DA9052_E_PEN_DOWN | DA9052_E_TSI_READY;
> + da9052_reg_update(tsi->da9052, DA9052_IRQ_MASK_B_REG, 0, 0xc0);
> +
> + 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 = kzalloc(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->id.bustype = tsi->da9052->bustype;
> + 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->da9052->irq_base + 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->da9052->irq_base + 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->da9052->irq_base + 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->da9052->irq_base + 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->da9052->irq_base + tsi->irq_datardy, tsi);
> +err_pendwn_irq:
> + free_irq(tsi->da9052->irq_base + tsi->irq_pendwn, tsi);
> +err_input:
> + input_free_device(input_dev);
> +err_mem:
> + kfree(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->da9052->irq_base + tsi->irq_pendwn, tsi);
> + free_irq(tsi->da9052->irq_base + tsi->irq_datardy, tsi);
> +
> + input_unregister_device(tsi->dev);
> +
> + platform_set_drvdata(pdev, NULL);
> +
> + kfree(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,
> + },
> +};
> +
> +static int __init da9052_ts_init(void)
> +{
> + return platform_driver_register(&da9052_tsi_driver);
> +}
> +module_init(da9052_ts_init);
> +
> +static void __exit da9052_ts_exit(void)
> +{
> + platform_driver_unregister(&da9052_tsi_driver);
> +}
> +module_exit(da9052_ts_exit);
> +
> +MODULE_DESCRIPTION("Touchscreen driver for Dialog Semiconductor DA9052");
> +MODULE_AUTHOR("David Dajun Chen <dchen@...semi.com>");
> +MODULE_LICENSE("GPL");
> +MODULE_ALIAS("platform:da9052-tsi");
>
>
--
Dmitry
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