[adm5120] add custom GPIO-based I2C driver

[openwrt.git] / target / linux / adm5120 / files / drivers / i2c / busses / i2c-gpio-custom.c

diff --git a/target/linux/adm5120/files/drivers/i2c/busses/i2c-gpio-custom.c b/target/linux/adm5120/files/drivers/i2c/busses/i2c-gpio-custom.c
new file mode 100644 (file)
index 0000000..a019faf
--- /dev/null
+++ b/target/linux/adm5120/files/drivers/i2c/busses/i2c-gpio-custom.c
@@ -0,0 +1,71 @@
+/*
+ *  Custom GPIO-based I2C driver
+ *
+ *  Copyright (C) 2007 Gabor Juhos <juhosg at openwrt.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 as
+ *  published by the Free Software Foundation.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/platform_device.h>
+
+#include <linux/i2c-gpio.h>
+
+#define DRV_NAME       "i2c-gpio-custom"
+#define DRV_DESC       "Custom GPIO I2C device driver"
+
+static unsigned int sda = CONFIG_I2C_GPIO_CUSTOM_SDA;
+static unsigned int scl = CONFIG_I2C_GPIO_CUSTOM_SCL;
+static int id = CONFIG_I2C_GPIO_CUSTOM_DEVICE_ID;
+
+module_param(sda, uint, S_IRUGO);
+MODULE_PARM_DESC(sda, "GPIO pin for SDA");
+
+module_param(scl, uint, S_IRUGO);
+MODULE_PARM_DESC(scl, "GPIO pin for SCL");
+
+module_param(id, int, S_IRUGO);
+MODULE_PARM_DESC(id, "device id of the i2c-gpio device");
+
+static struct i2c_gpio_platform_data i2c_data;
+static struct platform_device i2c_device;
+
+static void i2c_gpio_custom_release(struct platform_device *pdev)
+{
+       /* nothing to do */
+}
+
+static int __init i2c_gpio_custom_init(void)
+{
+       int err;
+
+       i2c_data.sda_pin = sda;
+       i2c_data.scl_pin = scl;
+
+       i2c_device.name = "i2c-gpio";
+       i2c_device.id   = id;
+
+       i2c_device.dev.platform_data    = &i2c_data,
+       i2c_device.dev.release          = i2c_gpio_custom_release,
+
+       err = platform_device_register(&i2c_device);
+
+       return err;
+}
+
+static void __exit i2c_gpio_custom_exit(void)
+{
+       platform_device_unregister(&i2c_device);
+}
+
+module_init(i2c_gpio_custom_init);
+module_exit(i2c_gpio_custom_exit);
+
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR("Gabor Juhos <juhosg at openwrt.org >");
+MODULE_DESCRIPTION(DRV_DESC);
+