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    Subject[PATCH 2/3] Input: cyttsp - add support for Cypress TTSP touchscreen I2C bus interface
    Date
    The driver is composed of a core driver that process the data sent by
    the contacts and a set of bus specific interface modules.

    This patch add supports for the Cypress TTSP I2C bus interface.

    The original author of the driver is Kevin McNeely <kev@cypress.com>

    Signed-off-by: Javier Martinez Canillas <martinez.javier@gmail.com>
    ---
    drivers/input/touchscreen/cyttsp/Kconfig | 12 ++
    drivers/input/touchscreen/cyttsp/Makefile | 1 +
    drivers/input/touchscreen/cyttsp/cyttsp_i2c.c | 188 +++++++++++++++++++++++++
    3 files changed, 201 insertions(+), 0 deletions(-)
    create mode 100644 drivers/input/touchscreen/cyttsp/cyttsp_i2c.c

    diff --git a/drivers/input/touchscreen/cyttsp/Kconfig b/drivers/input/touchscreen/cyttsp/Kconfig
    index 7e8e0f4..256642d 100644
    --- a/drivers/input/touchscreen/cyttsp/Kconfig
    +++ b/drivers/input/touchscreen/cyttsp/Kconfig
    @@ -2,3 +2,15 @@ config TOUCHSCREEN_CYTTSP_CORE
    tristate "Cypress TTSP touchscreen core"
    help
    Always activated for Cypress TTSP touchscreen
    +
    +config TOUCHSCREEN_CYTTSP_I2C
    + tristate "Cypress TTSP i2c touchscreen"
    + depends on I2C && TOUCHSCREEN_CYTTSP_CORE
    + help
    + Say Y here if you have a Cypress TTSP touchscreen
    + connected to your system with an I2C interface.
    +
    + If unsure, say N.
    +
    + To compile this driver as a module, choose M here: the
    + module will be called cyttsp-i2c.
    diff --git a/drivers/input/touchscreen/cyttsp/Makefile b/drivers/input/touchscreen/cyttsp/Makefile
    index d1b250f..9101dc9 100644
    --- a/drivers/input/touchscreen/cyttsp/Makefile
    +++ b/drivers/input/touchscreen/cyttsp/Makefile
    @@ -1 +1,2 @@
    obj-$(CONFIG_TOUCHSCREEN_CYTTSP_CORE) += cyttsp_core.o
    +obj-$(CONFIG_TOUCHSCREEN_CYTTSP_I2C) += cyttsp_i2c.o
    diff --git a/drivers/input/touchscreen/cyttsp/cyttsp_i2c.c b/drivers/input/touchscreen/cyttsp/cyttsp_i2c.c
    new file mode 100644
    index 0000000..d79c6a7
    --- /dev/null
    +++ b/drivers/input/touchscreen/cyttsp/cyttsp_i2c.c
    @@ -0,0 +1,188 @@
    +/*
    + * Source for:
    + * Cypress TrueTouch(TM) Standard Product (TTSP) I2C touchscreen driver.
    + * For use with Cypress Txx3xx parts.
    + * Supported parts include:
    + * CY8CTST341
    + * CY8CTMA340
    + *
    + * Copyright (C) 2009, 2010, 2011 Cypress Semiconductor, Inc.
    + *
    + * 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 <kev@cypress.com>
    + *
    + */
    +
    +#include "cyttsp_core.h"
    +
    +#include <linux/i2c.h>
    +#include <linux/slab.h>
    +
    +#define CY_I2C_DATA_SIZE 128
    +
    +struct cyttsp_i2c {
    + struct cyttsp_bus_ops ops;
    + struct i2c_client *client;
    + void *ttsp_client;
    + u8 wr_buf[CY_I2C_DATA_SIZE];
    +};
    +
    +static s32 ttsp_i2c_read_block_data(void *handle, u8 addr,
    + u8 length, void *values)
    +{
    + struct cyttsp_i2c *ts = container_of(handle, struct cyttsp_i2c, ops);
    + int retval = 0;
    +
    + retval = i2c_master_send(ts->client, &addr, 1);
    + if (retval < 0)
    + return retval;
    +
    + retval = i2c_master_recv(ts->client, values, length);
    +
    + return (retval < 0) ? retval : 0;
    +}
    +
    +static s32 ttsp_i2c_write_block_data(void *handle, u8 addr,
    + u8 length, const void *values)
    +{
    + struct cyttsp_i2c *ts = container_of(handle, struct cyttsp_i2c, ops);
    + int retval;
    +
    + ts->wr_buf[0] = addr;
    + memcpy(&ts->wr_buf[1], values, length);
    +
    + retval = i2c_master_send(ts->client, ts->wr_buf, length+1);
    +
    + return (retval < 0) ? retval : 0;
    +}
    +
    +static s32 ttsp_i2c_tch_ext(void *handle, void *values)
    +{
    + struct cyttsp_i2c *ts = container_of(handle, struct cyttsp_i2c, ops);
    + int retval = 0;
    +
    + /*
    + * TODO: Add custom touch extension handling code here
    + * set: retval < 0 for any returned system errors,
    + * retval = 0 if normal touch handling is required,
    + * retval > 0 if normal touch handling is *not* required
    + */
    + if (!ts || !values)
    + retval = -EINVAL;
    +
    + return retval;
    +}
    +
    +static int __devinit cyttsp_i2c_probe(struct i2c_client *client,
    + const struct i2c_device_id *id)
    +{
    + struct cyttsp_i2c *ts;
    +
    + if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C))
    + return -EIO;
    +
    + /* allocate and clear memory */
    + ts = kzalloc(sizeof(*ts), GFP_KERNEL);
    + if (!ts) {
    + dev_dbg(&client->dev, "%s: Error, kzalloc.\n", __func__);
    + return -ENOMEM;
    + }
    +
    + /* register driver_data */
    + ts->client = client;
    + i2c_set_clientdata(client, ts);
    + ts->ops.write = ttsp_i2c_write_block_data;
    + ts->ops.read = ttsp_i2c_read_block_data;
    + ts->ops.ext = ttsp_i2c_tch_ext;
    + ts->ops.dev = &client->dev;
    + ts->ops.dev->bus = &i2c_bus_type;
    +
    + ts->ttsp_client = cyttsp_core_init(&ts->ops, &client->dev);
    + if (IS_ERR(ts->ttsp_client)) {
    + int retval = PTR_ERR(ts->ttsp_client);
    + kfree(ts);
    + return retval;
    + }
    +
    + dev_dbg(ts->ops.dev, "%s: Registration complete\n", __func__);
    +
    + return 0;
    +}
    +
    +
    +/* registered in driver struct */
    +static int __devexit cyttsp_i2c_remove(struct i2c_client *client)
    +{
    + struct cyttsp_i2c *ts;
    +
    + ts = i2c_get_clientdata(client);
    + cyttsp_core_release(ts->ttsp_client);
    + kfree(ts);
    + return 0;
    +}
    +
    +#ifdef CONFIG_PM
    +static int cyttsp_i2c_suspend(struct i2c_client *client, pm_message_t message)
    +{
    + struct cyttsp_i2c *ts = i2c_get_clientdata(client);
    +
    + return cyttsp_suspend(ts->ttsp_client);
    +}
    +
    +static int cyttsp_i2c_resume(struct i2c_client *client)
    +{
    + struct cyttsp_i2c *ts = i2c_get_clientdata(client);
    +
    + return cyttsp_resume(ts->ttsp_client);
    +}
    +#endif
    +
    +static const struct i2c_device_id cyttsp_i2c_id[] = {
    + { CY_I2C_NAME, 0 }, { }
    +};
    +
    +static struct i2c_driver cyttsp_i2c_driver = {
    + .driver = {
    + .name = CY_I2C_NAME,
    + .owner = THIS_MODULE,
    + },
    + .probe = cyttsp_i2c_probe,
    + .remove = __devexit_p(cyttsp_i2c_remove),
    + .id_table = cyttsp_i2c_id,
    +#ifdef CONFIG_PM
    + .suspend = cyttsp_i2c_suspend,
    + .resume = cyttsp_i2c_resume,
    +#endif
    +};
    +
    +static int __init cyttsp_i2c_init(void)
    +{
    + return i2c_add_driver(&cyttsp_i2c_driver);
    +}
    +
    +static void __exit cyttsp_i2c_exit(void)
    +{
    + return i2c_del_driver(&cyttsp_i2c_driver);
    +}
    +
    +module_init(cyttsp_i2c_init);
    +module_exit(cyttsp_i2c_exit);
    +
    +MODULE_ALIAS("i2c:cyttsp");
    +MODULE_LICENSE("GPL");
    +MODULE_DESCRIPTION("Cypress TrueTouch(R) Standard Product (TTSP) I2C driver");
    +MODULE_AUTHOR("Cypress");
    +MODULE_DEVICE_TABLE(i2c, cyttsp_i2c_id);
    --
    1.7.4.1


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