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Date: Tue, 7 Aug 2012 16:10:47 +0300
From: Ferruh Yigit <fery@...ress.com>
To: Dmitry Torokhov <dmitry.torokhov@...il.com>
CC: Kevin McNeely <kev@...ress.com>, Ferruh YIGIT <fery@...ress.com>,
Javier Martinez Canillas <javier@...hile0.org>,
Henrik Rydberg <rydberg@...omail.se>,
Shawn Landden <shawnlandden@...il.com>,
Ashish Jangam <ashish.jangam@...tcummins.com>,
Olivier Sobrie <olivier@...rie.be>,
linux-input@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 4/4] Input: cyttsp4 - I2C driver for Cypress TMA4XX touchscreen devices
From: Ferruh YIGIT <fery@...ress.com>
Cypress TrueTouch(tm) Standard Product controllers, Generation4 devices,
I2C adapter module.
This driver adds communication support with TTSP controller using I2C
bus.
Signed-off-by: Ferruh YIGIT <fery@...ress.com>
---
drivers/input/touchscreen/Kconfig | 13 ++
drivers/input/touchscreen/Makefile | 3 +
drivers/input/touchscreen/cyttsp4_i2c.c | 246 +++++++++++++++++++++++++++++++
drivers/input/touchscreen/cyttsp4_i2c.h | 35 +++++
4 files changed, 297 insertions(+)
create mode 100644 drivers/input/touchscreen/cyttsp4_i2c.c
create mode 100644 drivers/input/touchscreen/cyttsp4_i2c.h
diff --git a/drivers/input/touchscreen/Kconfig b/drivers/input/touchscreen/Kconfig
index 57a38f8..58f5d0b 100644
--- a/drivers/input/touchscreen/Kconfig
+++ b/drivers/input/touchscreen/Kconfig
@@ -192,6 +192,7 @@ config TOUCHSCREEN_CYPRESS_CYTTSP4
tristate "Cypress TrueTouch Gen4 Touchscreen Driver"
default m
select CYPRESS_CYTTSP4_BUS
+ select TOUCHSCREEN_CYPRESS_CYTTSP4_I2C
select TOUCHSCREEN_CYPRESS_CYTTSP4_MT_B
help
Core driver for Cypress TrueTouch(tm) Standard Product
@@ -223,6 +224,18 @@ config TOUCHSCREEN_CYPRESS_CYTTSP4_VDEBUG
Say Y here to enable verbose debug output.
+config TOUCHSCREEN_CYPRESS_CYTTSP4_I2C
+ tristate "Cypress TrueTouch Gen4 I2C"
+ depends on TOUCHSCREEN_CYPRESS_CYTTSP4
+ select I2C
+ default m
+ help
+ Cypress TrueTouch(tm) Standard Product Generation4
+ I2C bus interface.
+
+ Say Y here to enable I2C bus interface to TTSP
+ touchscreen controller.
+
config TOUCHSCREEN_CYPRESS_CYTTSP4_MT_B
tristate "Cypress TrueTouch Gen4 MultiTouch Protocol B"
depends on TOUCHSCREEN_CYPRESS_CYTTSP4
diff --git a/drivers/input/touchscreen/Makefile b/drivers/input/touchscreen/Makefile
index 8feae16..c5e5fc6 100644
--- a/drivers/input/touchscreen/Makefile
+++ b/drivers/input/touchscreen/Makefile
@@ -75,11 +75,13 @@ obj-$(CONFIG_TOUCHSCREEN_W90X900) += w90p910_ts.o
obj-$(CONFIG_TOUCHSCREEN_TPS6507X) += tps6507x-ts.o
obj-$(CONFIG_CYPRESS_CYTTSP4_BUS) += cyttsp4_bus.o
obj-$(CONFIG_TOUCHSCREEN_CYPRESS_CYTTSP4) += cyttsp4_core.o
+obj-$(CONFIG_TOUCHSCREEN_CYPRESS_CYTTSP4_I2C) += cyttsp4_i2c.o
obj-$(CONFIG_TOUCHSCREEN_CYPRESS_CYTTSP4_MT_B) += cyttsp4_mt_b.o
cyttsp4_mt_b-y := cyttsp4_mtb.o cyttsp4_mt_common.o
ifeq ($(CONFIG_TOUCHSCREEN_CYPRESS_CYTTSP4_DEBUG),y)
CFLAGS_cyttsp4_core.o += -DDEBUG
CFLAGS_cyttsp4_bus.o += -DDEBUG
+CFLAGS_cyttsp4_i2c.o += -DDEBUG
CFLAGS_cyttsp4_mtb.o += -DDEBUG
CFLAGS_cyttsp4_mt_b.o += -DDEBUG
CFLAGS_cyttsp4_mt_common.o += -DDEBUG
@@ -88,6 +90,7 @@ endif
ifeq ($(CONFIG_TOUCHSCREEN_CYPRESS_CYTTSP4_VDEBUG),y)
CFLAGS_cyttsp4_core.o += -DVERBOSE_DEBUG
CFLAGS_cyttsp4_bus.o += -DVERBOSE_DEBUG
+CFLAGS_cyttsp4_i2c.o += -DVERBOSE_DEBUG
CFLAGS_cyttsp4_mtb.o += -DVERBOSE_DEBUG
CFLAGS_cyttsp4_mt_b.o += -DVERBOSE_DEBUG
CFLAGS_cyttsp4_mt_common.o += -DVERBOSE_DEBUG
diff --git a/drivers/input/touchscreen/cyttsp4_i2c.c b/drivers/input/touchscreen/cyttsp4_i2c.c
new file mode 100644
index 0000000..e330219
--- /dev/null
+++ b/drivers/input/touchscreen/cyttsp4_i2c.c
@@ -0,0 +1,246 @@
+/*
+ * cyttsp4_i2c.c
+ * Cypress TrueTouch(TM) Standard Product V4 I2C Driver module.
+ * For use with Cypress Txx4xx parts.
+ * Supported parts include:
+ * TMA4XX
+ * TMA1036
+ *
+ * Copyright (C) 2012 Cypress Semiconductor
+ * Copyright (C) 2011 Sony Ericsson Mobile Communications AB.
+ *
+ * Author: Aleksej Makarov <aleksej.makarov@...yericsson.com>
+ * Modified by: Cypress Semiconductor for test with device
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * version 2, and only version 2, as published by the
+ * Free Software Foundation.
+ *
+ * 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 Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ * Contact Cypress Semiconductor at www.cypress.com <ttdrivers@...ress.com>
+ *
+ */
+
+#include <linux/cyttsp4_bus.h>
+#include "cyttsp4_i2c.h"
+
+#include <linux/delay.h>
+#include <linux/hrtimer.h>
+#include <linux/i2c.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/pm_runtime.h>
+#include <linux/slab.h>
+
+#define CY_I2C_DATA_SIZE (3 * 256)
+
+struct cyttsp4_i2c {
+ struct i2c_client *client;
+ u8 wr_buf[CY_I2C_DATA_SIZE];
+ struct hrtimer timer;
+ struct mutex lock;
+ atomic_t timeout;
+};
+
+static int cyttsp4_i2c_read_block_data(struct cyttsp4_i2c *ts_i2c, u8 addr,
+ size_t length, void *values)
+{
+ int rc;
+
+ /* write addr */
+ rc = i2c_master_send(ts_i2c->client, &addr, sizeof(addr));
+ if (rc < 0)
+ return rc;
+ else if (rc != sizeof(addr))
+ return -EIO;
+
+ /* read data */
+ rc = i2c_master_recv(ts_i2c->client, values, length);
+
+ return (rc < 0) ? rc : rc != length ? -EIO : 0;
+}
+
+static int cyttsp4_i2c_write_block_data(struct cyttsp4_i2c *ts_i2c, u8 addr,
+ size_t length, const void *values)
+{
+ int rc;
+
+ if (sizeof(ts_i2c->wr_buf) < (length + 1))
+ return -ENOMEM;
+
+ ts_i2c->wr_buf[0] = addr;
+ memcpy(&ts_i2c->wr_buf[1], values, length);
+ length += 1;
+
+ /* write data */
+ rc = i2c_master_send(ts_i2c->client, ts_i2c->wr_buf, length);
+
+ return (rc < 0) ? rc : rc != length ? -EIO : 0;
+}
+
+static int cyttsp4_i2c_write(struct cyttsp4_adapter *adap, u8 addr,
+ const void *buf, int size)
+{
+ struct cyttsp4_i2c *ts = dev_get_drvdata(adap->dev);
+ int rc;
+
+ pm_runtime_get_noresume(adap->dev);
+ mutex_lock(&ts->lock);
+ rc = cyttsp4_i2c_write_block_data(ts, addr, size, buf);
+ mutex_unlock(&ts->lock);
+ pm_runtime_put_noidle(adap->dev);
+
+ return rc;
+}
+
+static int cyttsp4_i2c_read(struct cyttsp4_adapter *adap, u8 addr,
+ void *buf, int size)
+{
+ struct cyttsp4_i2c *ts = dev_get_drvdata(adap->dev);
+ int rc;
+
+ pm_runtime_get_noresume(adap->dev);
+ mutex_lock(&ts->lock);
+ rc = cyttsp4_i2c_read_block_data(ts, addr, size, buf);
+ mutex_unlock(&ts->lock);
+ pm_runtime_put_noidle(adap->dev);
+
+ return rc;
+}
+
+static struct cyttsp4_ops ops = {
+ .write = cyttsp4_i2c_write,
+ .read = cyttsp4_i2c_read,
+};
+
+static int __devinit cyttsp4_i2c_probe(struct i2c_client *client,
+ const struct i2c_device_id *i2c_id)
+{
+ struct cyttsp4_i2c *ts_i2c;
+ struct device *dev = &client->dev;
+ char const *adap_id = dev_get_platdata(dev);
+ char const *id;
+ int rc;
+
+ dev_info(dev, "%s: Starting %s probe...\n", __func__, CYTTSP4_I2C_NAME);
+
+ dev_dbg(dev, "%s: debug on\n", __func__);
+ dev_vdbg(dev, "%s: verbose debug on\n", __func__);
+
+ if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
+ dev_err(dev, "%s: fail check I2C functionality\n", __func__);
+ rc = -EIO;
+ goto error_alloc_data_failed;
+ }
+
+ ts_i2c = kzalloc(sizeof(struct cyttsp4_i2c), GFP_KERNEL);
+ if (ts_i2c == NULL) {
+ dev_err(dev, "%s: Error, kzalloc.\n", __func__);
+ rc = -ENOMEM;
+ goto error_alloc_data_failed;
+ }
+
+ mutex_init(&ts_i2c->lock);
+ ts_i2c->client = client;
+ client->dev.bus = &i2c_bus_type;
+ i2c_set_clientdata(client, ts_i2c);
+ dev_set_drvdata(&client->dev, ts_i2c);
+
+ if (adap_id)
+ id = adap_id;
+ else
+ id = CYTTSP4_I2C_NAME;
+
+ dev_dbg(dev, "%s: add adap='%s' (CYTTSP4_I2C_NAME=%s)\n", __func__, id,
+ CYTTSP4_I2C_NAME);
+
+ pm_runtime_enable(&client->dev);
+
+ rc = cyttsp4_add_adapter(id, &ops, dev);
+ if (rc) {
+ dev_err(dev, "%s: Error on probe %s\n", __func__,
+ CYTTSP4_I2C_NAME);
+ goto add_adapter_err;
+ }
+
+ dev_info(dev, "%s: Successful probe %s\n", __func__, CYTTSP4_I2C_NAME);
+
+ return 0;
+
+add_adapter_err:
+ pm_runtime_disable(&client->dev);
+ dev_set_drvdata(&client->dev, NULL);
+ i2c_set_clientdata(client, NULL);
+ kfree(ts_i2c);
+error_alloc_data_failed:
+ return rc;
+}
+
+/* registered in driver struct */
+static int __devexit cyttsp4_i2c_remove(struct i2c_client *client)
+{
+ struct device *dev = &client->dev;
+ struct cyttsp4_i2c *ts_i2c = dev_get_drvdata(dev);
+ char const *adap_id = dev_get_platdata(dev);
+ char const *id;
+
+ if (adap_id)
+ id = adap_id;
+ else
+ id = CYTTSP4_I2C_NAME;
+
+ dev_info(dev, "%s\n", __func__);
+ cyttsp4_del_adapter(id);
+ pm_runtime_disable(&client->dev);
+ dev_set_drvdata(&client->dev, NULL);
+ i2c_set_clientdata(client, NULL);
+ kfree(ts_i2c);
+ return 0;
+}
+
+static const struct i2c_device_id cyttsp4_i2c_id[] = {
+ { CYTTSP4_I2C_NAME, 0 }, { }
+};
+
+static struct i2c_driver cyttsp4_i2c_driver = {
+ .driver = {
+ .name = CYTTSP4_I2C_NAME,
+ .owner = THIS_MODULE,
+ },
+ .probe = cyttsp4_i2c_probe,
+ .remove = __devexit_p(cyttsp4_i2c_remove),
+ .id_table = cyttsp4_i2c_id,
+};
+
+static int __init cyttsp4_i2c_init(void)
+{
+ int rc = i2c_add_driver(&cyttsp4_i2c_driver);
+
+ pr_info("%s: Cypress TTSP I2C Touchscreen Driver (Built %s @ %s) rc=%d\n",
+ __func__, __DATE__, __TIME__, rc);
+ return rc;
+}
+module_init(cyttsp4_i2c_init);
+
+static void __exit cyttsp4_i2c_exit(void)
+{
+ i2c_del_driver(&cyttsp4_i2c_driver);
+ pr_info("%s: module exit\n", __func__);
+}
+module_exit(cyttsp4_i2c_exit);
+
+MODULE_ALIAS(CYTTSP4_I2C_NAME);
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Cypress TrueTouch(R) Standard Product (TTSP) I2C driver");
+MODULE_AUTHOR("Cypress");
+MODULE_DEVICE_TABLE(i2c, cyttsp4_i2c_id);
diff --git a/drivers/input/touchscreen/cyttsp4_i2c.h b/drivers/input/touchscreen/cyttsp4_i2c.h
new file mode 100644
index 0000000..94fd104
--- /dev/null
+++ b/drivers/input/touchscreen/cyttsp4_i2c.h
@@ -0,0 +1,35 @@
+/*
+ * cyttsp4_i2c.h
+ * Cypress TrueTouch(TM) Standard Product V4 I2C driver module.
+ * For use with Cypress Txx4xx parts.
+ * Supported parts include:
+ * TMA4XX
+ * TMA1036
+ *
+ * Copyright (C) 2012 Cypress Semiconductor
+ * Copyright (C) 2011 Sony Ericsson Mobile Communications AB.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * version 2, and only version 2, as published by the
+ * Free Software Foundation.
+ *
+ * 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 Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ * Contact Cypress Semiconductor at www.cypress.com <ttdrivers@...ress.com>
+ *
+ */
+
+#ifndef _LINUX_CYTTSP4_I2C_H
+#define _LINUX_CYTTSP4_I2C_H
+
+#define CYTTSP4_I2C_NAME "cyttsp4_i2c_adapter"
+
+#endif /* _LINUX_CYTTSP4_I2C_H */
--
1.7.9.5
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