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Message-Id: <1250089531-10399-3-git-send-email-s.hauer@pengutronix.de>
Date: Wed, 12 Aug 2009 17:05:28 +0200
From: Sascha Hauer <s.hauer@...gutronix.de>
To: linux-kernel@...r.kernel.org
Cc: linux-arm-kernel@...ts.arm.linux.org.uk,
Sascha Hauer <s.hauer@...gutronix.de>,
Dmitry Torokhov <dmitry.torokhov@...il.com>,
Mark Brown <broonie@...nsource.wolfsonmicro.com>,
linux-input@...r.kernel.org
Subject: [PATCH 2/5] [input] add mc13783 touchscreen driver
This driver provides support for the touchscreen interface
integrated into the Freescale MC13783.
changes since v1:
- remove unused functions
- use queue_delayed_work instead of queue_work
- report pen events as BTN_TOUCH instead of ABS_PRESSURE
- handle interrupt registration in open/close functions
- do not call input_free_device() on already registered
input_device
- use platform_driver_probe instead of platform_driver_register
- add MODULE_ALIAS
Signed-off-by: Sascha Hauer <s.hauer@...gutronix.de>
Cc: Dmitry Torokhov <dmitry.torokhov@...il.com>
Cc: Mark Brown <broonie@...nsource.wolfsonmicro.com>
Cc: linux-input@...r.kernel.org
---
drivers/input/touchscreen/Kconfig | 12 ++
drivers/input/touchscreen/Makefile | 1 +
drivers/input/touchscreen/mc13783_ts.c | 222 ++++++++++++++++++++++++++++++++
3 files changed, 235 insertions(+), 0 deletions(-)
create mode 100644 drivers/input/touchscreen/mc13783_ts.c
diff --git a/drivers/input/touchscreen/Kconfig b/drivers/input/touchscreen/Kconfig
index 72e2712..7451cf0 100644
--- a/drivers/input/touchscreen/Kconfig
+++ b/drivers/input/touchscreen/Kconfig
@@ -413,6 +413,18 @@ config TOUCHSCREEN_USB_COMPOSITE
To compile this driver as a module, choose M here: the
module will be called usbtouchscreen.
+config TOUCHSCREEN_MC13783
+ tristate "Freescale MC13783 touchscreen input driver"
+ depends on MFD_MC13783
+ help
+ Say Y here if you have an Freescale MC13783 PMIC on your
+ board and want to use its touchscreen
+
+ If unsure, say N.
+
+ To compile this driver as a module, choose M here: the
+ module will be called mxc_ts.
+
config TOUCHSCREEN_USB_EGALAX
default y
bool "eGalax, eTurboTouch CT-410/510/700 device support" if EMBEDDED
diff --git a/drivers/input/touchscreen/Makefile b/drivers/input/touchscreen/Makefile
index 3e1c5e0..7b79598 100644
--- a/drivers/input/touchscreen/Makefile
+++ b/drivers/input/touchscreen/Makefile
@@ -20,6 +20,7 @@ obj-$(CONFIG_TOUCHSCREEN_INEXIO) += inexio.o
obj-$(CONFIG_TOUCHSCREEN_MIGOR) += migor_ts.o
obj-$(CONFIG_TOUCHSCREEN_MTOUCH) += mtouch.o
obj-$(CONFIG_TOUCHSCREEN_MK712) += mk712.o
+obj-$(CONFIG_TOUCHSCREEN_MC13783) += mc13783_ts.o
obj-$(CONFIG_TOUCHSCREEN_HP600) += hp680_ts_input.o
obj-$(CONFIG_TOUCHSCREEN_HP7XX) += jornada720_ts.o
obj-$(CONFIG_TOUCHSCREEN_HTCPEN) += htcpen.o
diff --git a/drivers/input/touchscreen/mc13783_ts.c b/drivers/input/touchscreen/mc13783_ts.c
new file mode 100644
index 0000000..80163f1
--- /dev/null
+++ b/drivers/input/touchscreen/mc13783_ts.c
@@ -0,0 +1,222 @@
+/*
+ * Driver for the Freescale Semiconductor MC13783 touchscreen.
+ *
+ * Copyright 2004-2007 Freescale Semiconductor, Inc. All Rights Reserved.
+ * Copyright (C) 2009 Sascha Hauer, Pengutronix
+ *
+ * Initial development of this code was funded by
+ * Phytec Messtechnik GmbH, http://www.phytec.de
+ *
+ * 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.
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program; if not, write to the Free Software Foundation, Inc., 51
+ * Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ *
+ */
+
+#include <linux/mfd/mc13783-private.h>
+#include <linux/platform_device.h>
+#include <linux/mfd/mc13783.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/delay.h>
+#include <linux/input.h>
+#include <linux/sched.h>
+#include <linux/init.h>
+
+#define MC13783_TS_NAME "mc13783-ts"
+
+struct mc13783_ts_priv {
+ struct input_dev *idev;
+ struct mc13783 *mc13783;
+ struct delayed_work work;
+ struct workqueue_struct *workq;
+ unsigned int sample[4];
+};
+
+#define TS_MIN 1
+#define TS_MAX 1000
+
+static void mc13783_ts_handler(int irq, void *data)
+{
+ struct mc13783_ts_priv *priv = data;
+ unsigned int sts;
+
+ mc13783_reg_read(priv->mc13783, MC13783_REG_INTERRUPT_STATUS_0, &sts);
+ mc13783_reg_write(priv->mc13783, MC13783_REG_INTERRUPT_STATUS_0,
+ sts & MC13783_INT_STAT_TSI);
+
+ if (sts & MC13783_INT_STAT_TSI)
+ queue_delayed_work(priv->workq, &priv->work, 0);
+}
+
+static void mc13783_ts_report_sample(struct mc13783_ts_priv *priv)
+{
+ int x, y, press = 0;
+
+ x = (priv->sample[2] >> 2) & 0x3ff;
+ y = (priv->sample[3] >> 2) & 0x3ff;
+
+ pr_debug("mc13783_ts: x: %d y: %d\n", x, y);
+
+ if (x > TS_MIN && x < TS_MAX && y > TS_MIN && y < TS_MAX) {
+ press = 1;
+ input_report_abs(priv->idev, ABS_X, x);
+ input_report_abs(priv->idev, ABS_Y, y);
+
+ queue_delayed_work(priv->workq, &priv->work, HZ / 50);
+ }
+
+ input_report_key(priv->idev, BTN_TOUCH, press);
+ input_sync(priv->idev);
+}
+
+static void mc13783_ts_work(struct work_struct *work)
+{
+ struct mc13783_ts_priv *priv =
+ container_of(work, struct mc13783_ts_priv, work.work);
+ unsigned int mode = MC13783_ADC_MODE_TS;
+ unsigned int channel = 12;
+ int ret;
+
+ ret = mc13783_adc_do_conversion
+ (priv->mc13783, mode, channel, priv->sample);
+
+ if (!ret)
+ mc13783_ts_report_sample(priv);
+}
+
+static int mc13783_ts_open(struct input_dev *dev)
+{
+ struct mc13783_ts_priv *priv = input_get_drvdata(dev);
+ int ret;
+
+ ret = mc13783_register_irq(priv->mc13783, MC13783_IRQ_TS,
+ mc13783_ts_handler, priv);
+ if (ret)
+ return ret;
+
+ queue_delayed_work(priv->workq, &priv->work, HZ / 20);
+
+ return 0;
+}
+
+static void mc13783_ts_close(struct input_dev *dev)
+{
+ struct mc13783_ts_priv *priv = input_get_drvdata(dev);
+
+ mc13783_free_irq(priv->mc13783, MC13783_IRQ_TS);
+}
+
+static int __devinit mc13783_ts_probe(struct platform_device *pdev)
+{
+ struct mc13783_ts_priv *priv;
+ struct input_dev *idev;
+ int ret;
+
+ priv = kzalloc(sizeof(*priv), GFP_KERNEL);
+ if (!priv)
+ return -ENOMEM;
+
+ priv->mc13783 = dev_get_drvdata(pdev->dev.parent);
+
+ idev = input_allocate_device();
+ if (!idev) {
+ ret = -ENOMEM;
+ goto err_input_alloc;
+ }
+
+ priv->idev = idev;
+ idev->name = MC13783_TS_NAME;
+ idev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
+ idev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
+ idev->absbit[0] = BIT_MASK(ABS_X) | BIT_MASK(ABS_Y);
+ idev->open = mc13783_ts_open;
+ idev->close = mc13783_ts_close;
+ input_set_abs_params(idev, ABS_X, TS_MIN, TS_MAX, 0, 0);
+ input_set_abs_params(idev, ABS_Y, TS_MIN, TS_MAX, 0, 0);
+
+ platform_set_drvdata(pdev, priv);
+
+ INIT_DELAYED_WORK(&priv->work, mc13783_ts_work);
+
+ priv->workq = create_singlethread_workqueue("mc13783_ts");
+ if (!priv->workq) {
+ ret = -ENOMEM;
+ goto err_input_alloc;
+ }
+
+ input_set_drvdata(idev, priv);
+
+ ret = input_register_device(priv->idev);
+ if (ret) {
+ dev_err(&pdev->dev,
+ "register input device failed with %d\n", ret);
+ goto err_failed_register;
+ }
+
+ /* unmask the ts wakeup interrupt */
+ mc13783_set_bits(priv->mc13783, MC13783_REG_INTERRUPT_MASK_0,
+ MC13783_INT_MASK_TSM, 0);
+
+ mc13783_adc_set_ts_status(priv->mc13783, 1);
+
+ return 0;
+
+err_failed_register:
+ input_free_device(priv->idev);
+err_input_alloc:
+ kfree(priv);
+
+ return ret;
+}
+
+static int __devexit mc13783_ts_remove(struct platform_device *pdev)
+{
+ struct mc13783_ts_priv *priv = platform_get_drvdata(pdev);
+
+ mc13783_adc_set_ts_status(priv->mc13783, 0);
+
+ cancel_delayed_work(&priv->work);
+ destroy_workqueue(priv->workq);
+
+ input_unregister_device(priv->idev);
+
+ kfree(priv);
+
+ return 0;
+}
+
+static struct platform_driver mc13783_ts_driver = {
+ .remove = __devexit_p(mc13783_ts_remove),
+ .driver = {
+ .owner = THIS_MODULE,
+ .name = MC13783_TS_NAME,
+ },
+};
+
+static int __init mc13783_ts_init(void)
+{
+ return platform_driver_probe(&mc13783_ts_driver, &mc13783_ts_probe);
+}
+
+static void __exit mc13783_ts_exit(void)
+{
+ platform_driver_unregister(&mc13783_ts_driver);
+}
+
+module_init(mc13783_ts_init);
+module_exit(mc13783_ts_exit);
+
+MODULE_DESCRIPTION("MC13783 input touchscreen driver");
+MODULE_AUTHOR("Sascha Hauer, <s.hauer@...gutronix.de>");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:mc13783-touch");
--
1.6.3.3
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