[PATCH 4/4] Input: cyttsp4 - I2C driver for Cypress TMA4XX touchscreen devices

[Ferruh Yigit <fery@cypress.com>]

From: Ferruh YIGIT <fery@cypress.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@cypress.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@sonyericsson.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@cypress.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@cypress.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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