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path: root/drivers/mfd/tps65912-i2c.c
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Diffstat (limited to 'drivers/mfd/tps65912-i2c.c')
-rw-r--r--drivers/mfd/tps65912-i2c.c140
1 files changed, 140 insertions, 0 deletions
diff --git a/drivers/mfd/tps65912-i2c.c b/drivers/mfd/tps65912-i2c.c
new file mode 100644
index 000000000..6a6343ee9
--- /dev/null
+++ b/drivers/mfd/tps65912-i2c.c
@@ -0,0 +1,140 @@
+/*
+ * tps65912-i2c.c -- I2C access for TI TPS65912x PMIC
+ *
+ * Copyright 2011 Texas Instruments Inc.
+ *
+ * Author: Margarita Olaya Cabrera <magi@slimlogic.co.uk>
+ *
+ * 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 driver is based on wm8350 implementation.
+ */
+
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/gpio.h>
+#include <linux/i2c.h>
+#include <linux/mfd/core.h>
+#include <linux/mfd/tps65912.h>
+
+static int tps65912_i2c_read(struct tps65912 *tps65912, u8 reg,
+ int bytes, void *dest)
+{
+ struct i2c_client *i2c = tps65912->control_data;
+ struct i2c_msg xfer[2];
+ int ret;
+
+ /* Write register */
+ xfer[0].addr = i2c->addr;
+ xfer[0].flags = 0;
+ xfer[0].len = 1;
+ xfer[0].buf = &reg;
+
+ /* Read data */
+ xfer[1].addr = i2c->addr;
+ xfer[1].flags = I2C_M_RD;
+ xfer[1].len = bytes;
+ xfer[1].buf = dest;
+
+ ret = i2c_transfer(i2c->adapter, xfer, 2);
+ if (ret == 2)
+ ret = 0;
+ else if (ret >= 0)
+ ret = -EIO;
+ return ret;
+}
+
+static int tps65912_i2c_write(struct tps65912 *tps65912, u8 reg,
+ int bytes, void *src)
+{
+ struct i2c_client *i2c = tps65912->control_data;
+ /* we add 1 byte for device register */
+ u8 msg[TPS6591X_MAX_REGISTER + 1];
+ int ret;
+
+ if (bytes > TPS6591X_MAX_REGISTER)
+ return -EINVAL;
+
+ msg[0] = reg;
+ memcpy(&msg[1], src, bytes);
+
+ ret = i2c_master_send(i2c, msg, bytes + 1);
+ if (ret < 0)
+ return ret;
+ if (ret != bytes + 1)
+ return -EIO;
+
+ return 0;
+}
+
+static int tps65912_i2c_probe(struct i2c_client *i2c,
+ const struct i2c_device_id *id)
+{
+ struct tps65912 *tps65912;
+
+ tps65912 = devm_kzalloc(&i2c->dev,
+ sizeof(struct tps65912), GFP_KERNEL);
+ if (tps65912 == NULL)
+ return -ENOMEM;
+
+ i2c_set_clientdata(i2c, tps65912);
+ tps65912->dev = &i2c->dev;
+ tps65912->control_data = i2c;
+ tps65912->read = tps65912_i2c_read;
+ tps65912->write = tps65912_i2c_write;
+
+ return tps65912_device_init(tps65912);
+}
+
+static int tps65912_i2c_remove(struct i2c_client *i2c)
+{
+ struct tps65912 *tps65912 = i2c_get_clientdata(i2c);
+
+ tps65912_device_exit(tps65912);
+
+ return 0;
+}
+
+static const struct i2c_device_id tps65912_i2c_id[] = {
+ {"tps65912", 0 },
+ { }
+};
+MODULE_DEVICE_TABLE(i2c, tps65912_i2c_id);
+
+static struct i2c_driver tps65912_i2c_driver = {
+ .driver = {
+ .name = "tps65912",
+ .owner = THIS_MODULE,
+ },
+ .probe = tps65912_i2c_probe,
+ .remove = tps65912_i2c_remove,
+ .id_table = tps65912_i2c_id,
+};
+
+static int __init tps65912_i2c_init(void)
+{
+ int ret;
+
+ ret = i2c_add_driver(&tps65912_i2c_driver);
+ if (ret != 0)
+ pr_err("Failed to register TPS65912 I2C driver: %d\n", ret);
+
+ return ret;
+}
+/* init early so consumer devices can complete system boot */
+subsys_initcall(tps65912_i2c_init);
+
+static void __exit tps65912_i2c_exit(void)
+{
+ i2c_del_driver(&tps65912_i2c_driver);
+}
+module_exit(tps65912_i2c_exit);
+
+MODULE_AUTHOR("Margarita Olaya <magi@slimlogic.co.uk>");
+MODULE_DESCRIPTION("TPS6591x chip family multi-function driver");
+MODULE_LICENSE("GPL");