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Message-Id: <1238078818-25977-1-git-send-email-os@emlix.com>
Date: Thu, 26 Mar 2009 15:46:58 +0100
From: Oskar Schirmer <os@...ix.com>
To: Ben Dooks <ben-linux@...ff.org>
Cc: Chris Zankel <chris@...kel.net>, linux-i2c@...r.kernel.org,
linux-kernel@...r.kernel.org, Oskar Schirmer <os@...ix.com>
Subject: [patch] add pca9543 driver
support pca9543 i2c bus switch chip
Signed-off-by: Oskar Schirmer <os@...ix.com>
---
drivers/i2c/chips/Kconfig | 3 +
drivers/i2c/chips/Makefile | 1 +
drivers/i2c/chips/pca9543.c | 188 +++++++++++++++++++++++++++++++++++++++++++
3 files changed, 192 insertions(+), 0 deletions(-)
create mode 100644 drivers/i2c/chips/pca9543.c
diff --git a/drivers/i2c/chips/Kconfig b/drivers/i2c/chips/Kconfig
index c80312c..acfc46f 100644
--- a/drivers/i2c/chips/Kconfig
+++ b/drivers/i2c/chips/Kconfig
@@ -64,6 +64,9 @@ config SENSORS_PCA9539
This driver is deprecated and will be dropped soon. Use
drivers/gpio/pca953x.c instead.
+config PCA9543
+ tristate "Philips PCA9543 i2c bus switch"
+
config SENSORS_PCF8591
tristate "Philips PCF8591"
depends on EXPERIMENTAL
diff --git a/drivers/i2c/chips/Makefile b/drivers/i2c/chips/Makefile
index d142f23..c7a7fe2 100644
--- a/drivers/i2c/chips/Makefile
+++ b/drivers/i2c/chips/Makefile
@@ -13,6 +13,7 @@
obj-$(CONFIG_DS1682) += ds1682.o
obj-$(CONFIG_SENSORS_MAX6875) += max6875.o
obj-$(CONFIG_SENSORS_PCA9539) += pca9539.o
+obj-$(CONFIG_PCA9543) += pca9543.o
obj-$(CONFIG_SENSORS_PCF8574) += pcf8574.o
obj-$(CONFIG_PCF8575) += pcf8575.o
obj-$(CONFIG_SENSORS_PCF8591) += pcf8591.o
diff --git a/drivers/i2c/chips/pca9543.c b/drivers/i2c/chips/pca9543.c
new file mode 100644
index 0000000..ee59497
--- /dev/null
+++ b/drivers/i2c/chips/pca9543.c
@@ -0,0 +1,188 @@
+/*
+ * pca9543.c - i2c channel switch
+ *
+ * Copyright (C) 2008 Emlix GmbH <info@...ix.com>
+ * Authors: Fabian Godehardt <fg@...ix.com>
+ * Oskar Schirmer <os@...ix.com>
+ *
+ * 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., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/i2c.h>
+#include <linux/mutex.h>
+#include <linux/sysfs.h>
+
+struct pca9543_data {
+ struct mutex lock;
+ struct i2c_client *client;
+};
+
+static ssize_t pca9543_read(struct pca9543_data *data, char *buf, size_t count)
+{
+ int stat;
+ struct i2c_msg msg;
+ mutex_lock(&data->lock);
+ msg.addr = data->client->addr;
+ msg.flags = I2C_M_RD;
+ msg.buf = buf;
+ msg.len = 1;
+ stat = i2c_transfer(data->client->adapter, &msg, 1);
+ mutex_unlock(&data->lock);
+ if ((stat >= 0) && (stat != 1))
+ stat = -EIO;
+ return stat;
+}
+
+static ssize_t pca9543_bin_read(struct kobject *kobj,
+ struct bin_attribute *attr, char *buf, loff_t off, size_t count)
+{
+ struct pca9543_data *data;
+ data = dev_get_drvdata(container_of(kobj, struct device, kobj));
+ if (unlikely(!count))
+ return count;
+ if (off)
+ return -EINVAL;
+ return pca9543_read(data, buf, count);
+}
+
+static ssize_t pca9543_write(struct pca9543_data *data, char *buf, size_t count)
+{
+ int stat;
+ struct i2c_msg msg;
+ mutex_lock(&data->lock);
+ msg.addr = data->client->addr;
+ msg.flags = 0;
+ msg.buf = buf;
+ msg.len = 1;
+ stat = i2c_transfer(data->client->adapter, &msg, 1);
+ mutex_unlock(&data->lock);
+ if ((stat >= 0) && (stat != 1))
+ stat = -EIO;
+ return stat;
+}
+
+static ssize_t pca9543_bin_write(struct kobject *kobj,
+ struct bin_attribute *attr, char *buf, loff_t off, size_t count)
+{
+ struct pca9543_data *data;
+ data = dev_get_drvdata(container_of(kobj, struct device, kobj));
+ if (unlikely(!count))
+ return count;
+ if (off)
+ return -EINVAL;
+ return pca9543_write(data, buf, count);
+}
+
+static struct bin_attribute pca9543_attr = {
+ .attr = {
+ .name = "switch",
+ .mode = S_IRUGO | S_IWUSR,
+ },
+ .size = 1,
+ .read = pca9543_bin_read,
+ .write = pca9543_bin_write,
+};
+
+int pca9543_set_switch(struct i2c_client *client, unsigned value)
+{
+ struct pca9543_data *data;
+ u8 buf;
+ int ret;
+ data = i2c_get_clientdata(client);
+ buf = value;
+ ret = pca9543_write(data, &buf, 1);
+ if (ret > 0)
+ ret = 0;
+ return ret;
+}
+EXPORT_SYMBOL(pca9543_set_switch);
+
+static int pca9543_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ int err;
+ struct pca9543_data *data;
+ void (*cbf)(struct i2c_client *, int(*)(struct i2c_client *, unsigned));
+ if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
+ printk(KERN_ERR "pca9543 probe failure\n");
+ err = -EPFNOSUPPORT;
+ goto err;
+ }
+ data = kzalloc(sizeof(struct pca9543_data), GFP_KERNEL);
+ if (!data) {
+ err = -ENOMEM;
+ goto err;
+ }
+ mutex_init(&data->lock);
+ data->client = client;
+ err = sysfs_create_bin_file(&client->dev.kobj, &pca9543_attr);
+ if (err)
+ goto errmem;
+ i2c_set_clientdata(client, data);
+ dev_info(&client->dev,
+ "pca9543 i2c switch @ x%02x\n", client->addr);
+ cbf = client->dev.platform_data;
+ if (cbf)
+ cbf(client, &pca9543_set_switch);
+ return 0;
+errmem:
+ kfree(data);
+err:
+ return err;
+}
+
+static int pca9543_remove(struct i2c_client *client)
+{
+ struct pca9543_data *data;
+ data = i2c_get_clientdata(client);
+ sysfs_remove_bin_file(&client->dev.kobj, &pca9543_attr);
+ i2c_set_clientdata(client, NULL);
+ kfree(data);
+ return 0;
+}
+
+static const struct i2c_device_id pca9543_id[] = {
+ { "pca9543", 0 },
+ { }
+};
+
+static struct i2c_driver pca9543_driver = {
+ .driver = {
+ .name = "pca9543",
+ .owner = THIS_MODULE,
+ },
+ .probe = pca9543_probe,
+ .remove = pca9543_remove,
+ .id_table = pca9543_id,
+};
+
+static int __init pca9543_init(void)
+{
+ return i2c_add_driver(&pca9543_driver);
+}
+
+static void __exit pca9543_exit(void)
+{
+ i2c_del_driver(&pca9543_driver);
+}
+
+MODULE_AUTHOR("emlix GmbH <info@...ix.com>");
+MODULE_DESCRIPTION("pca9543 switch driver");
+MODULE_LICENSE("GPL");
+
+module_init(pca9543_init);
+module_exit(pca9543_exit);
--
1.6.2.107.ge47ee
--
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