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Message-Id: <1325722586-12886-3-git-send-email-javier@dowhile0.org>
Date: Thu, 5 Jan 2012 01:16:25 +0100
From: Javier Martinez Canillas <javier@...hile0.org>
To: Dmitry Torokhov <dmitry.torokhov@...il.com>
Cc: Henrik Rydberg <rydberg@...omail.se>,
Mohan Pallaka <mpallaka@...eaurora.org>,
Kevin McNeely <kev@...ress.com>,
Shubhrajyoti Datta <omaplinuxkernel@...il.com>,
linux-input@...r.kernel.org, linux-kernel@...r.kernel.org,
Javier Martinez Canillas <javier@...hile0.org>
Subject: [PATCH v8 2/3] Input: cyttsp - add support for Cypress TTSP touchscreen I2C bus interface
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.
Signed-off-by: Javier Martinez Canillas <javier@...hile0.org>
---
Changes for v8:
Javier Martinez Canillas (5):
- Check i2c_master_recv() didn't return and error before checking length
- Check i2c read completed sucessful
- Define module exit macro in i2c driver
- Fix return values for I2C transport
- Add error msg when capability is not supported
drivers/input/touchscreen/cyttsp_i2c.c | 137 ++++++++++++++++++++++++++++++++
1 files changed, 137 insertions(+), 0 deletions(-)
create mode 100644 drivers/input/touchscreen/cyttsp_i2c.c
diff --git a/drivers/input/touchscreen/cyttsp_i2c.c b/drivers/input/touchscreen/cyttsp_i2c.c
new file mode 100644
index 0000000..cdbf61d
--- /dev/null
+++ b/drivers/input/touchscreen/cyttsp_i2c.c
@@ -0,0 +1,137 @@
+/*
+ * 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.
+ * Copyright (C) 2012 Javier Martinez Canillas <javier@...hile0.org>
+ *
+ * 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@...ress.com>
+ *
+ */
+
+#include "cyttsp_core.h"
+
+#include <linux/i2c.h>
+#include <linux/input.h>
+
+#define CY_I2C_DATA_SIZE 128
+
+static int cyttsp_i2c_read_block_data(struct device *dev,
+ u8 addr, u8 length, void *values)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ int retval;
+
+ retval = i2c_master_send(client, &addr, 1);
+ if (retval < 0)
+ return retval;
+
+ retval = i2c_master_recv(client, values, length);
+
+ if (retval < 0)
+ return retval;
+
+ return (retval != length) ? -EIO : 0;
+}
+
+static int cyttsp_i2c_write_block_data(struct device *dev,
+ u8 addr, u8 length, const void *values)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ struct cyttsp *ts = i2c_get_clientdata(client);
+ int retval;
+
+ ts->xfer_buf[0] = addr;
+ memcpy(&ts->xfer_buf[1], values, length);
+ retval = i2c_master_send(client, ts->xfer_buf, length + 1);
+
+ return (retval < 0) ? retval : 0;
+}
+
+static const struct cyttsp_bus_ops cyttsp_i2c_bus_ops = {
+ .bustype = BUS_I2C,
+ .write = cyttsp_i2c_write_block_data,
+ .read = cyttsp_i2c_read_block_data,
+};
+
+static int __devinit cyttsp_i2c_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ struct cyttsp *ts;
+
+ if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
+ dev_err(&client->dev, "I2C functionality not Supported\n");
+ return -EIO;
+ }
+
+ ts = cyttsp_probe(&cyttsp_i2c_bus_ops, &client->dev, client->irq,
+ CY_I2C_DATA_SIZE);
+
+ if (IS_ERR(ts))
+ return PTR_ERR(ts);
+
+ i2c_set_clientdata(client, ts);
+
+ return 0;
+}
+
+static int __devexit cyttsp_i2c_remove(struct i2c_client *client)
+{
+ struct cyttsp *ts = i2c_get_clientdata(client);
+
+ cyttsp_remove(ts);
+
+ return 0;
+}
+
+static const struct i2c_device_id cyttsp_i2c_id[] = {
+ { CY_I2C_NAME, 0 },
+ { }
+};
+MODULE_DEVICE_TABLE(i2c, cyttsp_i2c_id);
+
+static struct i2c_driver cyttsp_i2c_driver = {
+ .driver = {
+ .name = CY_I2C_NAME,
+ .owner = THIS_MODULE,
+ .pm = &cyttsp_pm_ops,
+ },
+ .probe = cyttsp_i2c_probe,
+ .remove = __devexit_p(cyttsp_i2c_remove),
+ .id_table = cyttsp_i2c_id,
+};
+
+static int __init cyttsp_i2c_init(void)
+{
+ return i2c_add_driver(&cyttsp_i2c_driver);
+}
+module_init(cyttsp_i2c_init);
+
+static void __exit cyttsp_i2c_exit(void)
+{
+ return i2c_del_driver(&cyttsp_i2c_driver);
+}
+module_exit(cyttsp_i2c_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Cypress TrueTouch(R) Standard Product (TTSP) I2C driver");
+MODULE_AUTHOR("Cypress");
+MODULE_ALIAS("i2c:cyttsp");
--
1.7.4.1
--
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