MFD: TPS65910: Add new mfd device for TPS65910

The TPS65910 chip is a power management IC for multimedia and handheld
devices. It contains the following components:

- Regulators
- GPIO controller
- RTC

The tps65910 core driver is registered as a platform driver and provides
communication through I2C with the host device for the different
components.
Signed-off-by: Graeme Gregory <gg@slimlogic.co.uk>
Signed-off-by: Jorge Eduardo Candelaria <jedu@slimlogic.co.uk>
Acked-by: Samuel Ortiz <sameo@linux.intel.com>
Signed-off-by: Liam Girdwood <lrg@slimlogic.co.uk>

drivers/mfd/Kconfig

@@ -719,6 +719,14 @@ config MFD_PM8XXX_IRQ
 	  This is required to use certain other PM 8xxx features, such as GPIO
 	  and MPP.
 
+config MFD_TPS65910
+	tristate "TPS65910 Power Management chip"
+	depends on I2C &&  GPIOLIB
+	select MFD_CORE
+	help
+	  if you say yes here you get support for the TPS65910 series of
+	  Power Management chips.
+
 endif # MFD_SUPPORT
 
 menu "Multimedia Capabilities Port drivers"

drivers/mfd/Makefile

@@ -93,3 +93,4 @@ obj-$(CONFIG_MFD_CS5535)	+= cs5535-mfd.o
 obj-$(CONFIG_MFD_OMAP_USB_HOST)	+= omap-usb-host.o
 obj-$(CONFIG_MFD_PM8921_CORE) 	+= pm8921-core.o
 obj-$(CONFIG_MFD_PM8XXX_IRQ) 	+= pm8xxx-irq.o
+obj-$(CONFIG_MFD_TPS65910)	+= tps65910.o

drivers/mfd/tps65910.c

+/*
+ * tps65910.c  --  TI TPS6591x
+ *
+ * Copyright 2010 Texas Instruments Inc.
+ *
+ * Author: Graeme Gregory <gg@slimlogic.co.uk>
+ * Author: Jorge Eduardo Candelaria <jedu@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.
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/i2c.h>
+#include <linux/gpio.h>
+#include <linux/mfd/core.h>
+#include <linux/mfd/tps65910.h>
+
+static struct mfd_cell tps65910s[] = {
+	{
+		.name = "tps65910-pmic",
+	},
+	{
+		.name = "tps65910-rtc",
+	},
+	{
+		.name = "tps65910-power",
+	},
+};
+
+
+static int tps65910_i2c_read(struct tps65910 *tps65910, u8 reg,
+				  int bytes, void *dest)
+{
+	struct i2c_client *i2c = tps65910->i2c_client;
+	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 tps65910_i2c_write(struct tps65910 *tps65910, u8 reg,
+				   int bytes, void *src)
+{
+	struct i2c_client *i2c = tps65910->i2c_client;
+	/* we add 1 byte for device register */
+	u8 msg[TPS65910_MAX_REGISTER + 1];
+	int ret;
+
+	if (bytes > (TPS65910_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;
+}
+
+int tps65910_set_bits(struct tps65910 *tps65910, u8 reg, u8 mask)
+{
+	u8 data;
+	int err;
+
+	mutex_lock(&tps65910->io_mutex);
+	err = tps65910_i2c_read(tps65910, reg, 1, &data);
+	if (err) {
+		dev_err(tps65910->dev, "read from reg %x failed\n", reg);
+		goto out;
+	}
+
+	data |= mask;
+	err = tps65910_i2c_write(tps65910, reg, 1, &data);
+	if (err)
+		dev_err(tps65910->dev, "write to reg %x failed\n", reg);
+
+out:
+	mutex_unlock(&tps65910->io_mutex);
+	return err;
+}
+EXPORT_SYMBOL_GPL(tps65910_set_bits);
+
+int tps65910_clear_bits(struct tps65910 *tps65910, u8 reg, u8 mask)
+{
+	u8 data;
+	int err;
+
+	mutex_lock(&tps65910->io_mutex);
+	err = tps65910_i2c_read(tps65910, reg, 1, &data);
+	if (err) {
+		dev_err(tps65910->dev, "read from reg %x failed\n", reg);
+		goto out;
+	}
+
+	data &= mask;
+	err = tps65910_i2c_write(tps65910, reg, 1, &data);
+	if (err)
+		dev_err(tps65910->dev, "write to reg %x failed\n", reg);
+
+out:
+	mutex_unlock(&tps65910->io_mutex);
+	return err;
+}
+EXPORT_SYMBOL_GPL(tps65910_clear_bits);
+
+static int tps65910_i2c_probe(struct i2c_client *i2c,
+			    const struct i2c_device_id *id)
+{
+	struct tps65910 *tps65910;
+	int ret = 0;
+
+	tps65910 = kzalloc(sizeof(struct tps65910), GFP_KERNEL);
+	if (tps65910 == NULL)
+		return -ENOMEM;
+
+	i2c_set_clientdata(i2c, tps65910);
+	tps65910->dev = &i2c->dev;
+	tps65910->i2c_client = i2c;
+	tps65910->read = tps65910_i2c_read;
+	tps65910->write = tps65910_i2c_write;
+	mutex_init(&tps65910->io_mutex);
+
+	ret = mfd_add_devices(tps65910->dev, -1,
+			      tps65910s, ARRAY_SIZE(tps65910s),
+			      NULL, 0);
+	if (ret < 0)
+		goto err;
+
+	return ret;
+
+err:
+	mfd_remove_devices(tps65910->dev);
+	kfree(tps65910);
+	return ret;
+}
+
+static int tps65910_i2c_remove(struct i2c_client *i2c)
+{
+	struct tps65910 *tps65910 = i2c_get_clientdata(i2c);
+
+	mfd_remove_devices(tps65910->dev);
+	kfree(tps65910);
+
+	return 0;
+}
+
+static const struct i2c_device_id tps65910_i2c_id[] = {
+       { "tps65910", 0 },
+       { }
+};
+MODULE_DEVICE_TABLE(i2c, tps65910_i2c_id);
+
+
+static struct i2c_driver tps65910_i2c_driver = {
+	.driver = {
+		   .name = "tps65910",
+		   .owner = THIS_MODULE,
+	},
+	.probe = tps65910_i2c_probe,
+	.remove = tps65910_i2c_remove,
+	.id_table = tps65910_i2c_id,
+};
+
+static int __init tps65910_i2c_init(void)
+{
+	return i2c_add_driver(&tps65910_i2c_driver);
+}
+/* init early so consumer devices can complete system boot */
+subsys_initcall(tps65910_i2c_init);
+
+static void __exit tps65910_i2c_exit(void)
+{
+	i2c_del_driver(&tps65910_i2c_driver);
+}
+module_exit(tps65910_i2c_exit);
+
+MODULE_AUTHOR("Graeme Gregory <gg@slimlogic.co.uk>");
+MODULE_AUTHOR("Jorge Eduardo Candelaria <jedu@slimlogic.co.uk>");
+MODULE_DESCRIPTION("TPS6591x chip family multi-function driver");
+MODULE_LICENSE("GPL");