mfd: tps65912: Add new mfd device

The tps65912 chip is a power management IC. It contains the following
components:

- Regulators
- GPIO controller

The core driver is registered as a platform driver, it provides communication
through I2C and SPI interfaces.

Signed-off-by: Margarita Olaya Cabrera <magi@slimlogic.co.uk>
Acked-by: Samuel Ortiz <sameo@linux.intel.com>
Acked-by: Liam Girdwood <lrg@ti.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

1 files changed, 139 insertions, 0 deletions

diff --git a/drivers/mfd/tps65912-i2c.c b/drivers/mfd/tps65912-i2c.c
new file mode 100644
index 000000000000..9ed123aa6624
--- /dev/null
+++ b/drivers/mfd/tps65912-i2c.c
@@ -0,0 +1,139 @@
+/*
+ * 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 + 1))
+                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 = kzalloc(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");