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Commit c6c19332 authored by Mike Rapoport's avatar Mike Rapoport Committed by Samuel Ortiz
Browse files

mfd: Add TPS6586x driver 



Add mfd core driver for TPS6586x PMICs family.
The driver provides I/O access for the sub-device drivers and performs
regstration of the sub-devices based on the platform requirements.
In addition it implements GPIOlib interface for the chip GPIOs.

TODO:
        - add interrupt support
        - add platform data for PWM, backlight leds and charger

Signed-off-by: default avatarMike Rapoport <mike@compulab.co.il>
Signed-off-by: default avatarMike Rapoport <mike.rapoport@gmail.com>
Signed-off-by: default avatarSamuel Ortiz <sameo@linux.intel.com>
parent 1c888e2e

drivers/mfd/Kconfig

+14 −0
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@@ -531,6 +531,20 @@ config MFD_JZ4740_ADC 
	  Say yes here if you want support for the ADC unit in the JZ4740 SoC.

	  This driver is necessary for jz4740-battery and jz4740-hwmon driver.



config MFD_TPS6586X

	tristate "TPS6586x Power Management chips"

	depends on I2C && GPIOLIB

	select MFD_CORE

	help

	  If you say yes here you get support for the TPS6586X series of

	  Power Management chips.

	  This driver provides common support for accessing the device,

	  additional drivers must be enabled in order to use the

	  functionality of the device.



	  This driver can also be built as a module.  If so, the module

	  will be called tps6586x.



endif # MFD_SUPPORT



menu "Multimedia Capabilities Port drivers"

drivers/mfd/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -74,3 +74,4 @@ obj-$(CONFIG_LPC_SCH) += lpc_sch.o 
obj-$(CONFIG_MFD_RDC321X)	+= rdc321x-southbridge.o

obj-$(CONFIG_MFD_JANZ_CMODIO)	+= janz-cmodio.o

obj-$(CONFIG_MFD_JZ4740_ADC)	+= jz4740-adc.o

obj-$(CONFIG_MFD_TPS6586X)	+= tps6586x.o

drivers/mfd/tps6586x.c

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/*

 * Core driver for TI TPS6586x PMIC family

 *

 * Copyright (c) 2010 CompuLab Ltd.

 * Mike Rapoport <mike@compulab.co.il>

 *

 * Based on da903x.c.

 * Copyright (C) 2008 Compulab, Ltd.

 * Mike Rapoport <mike@compulab.co.il>

 * Copyright (C) 2006-2008 Marvell International Ltd.

 * Eric Miao <eric.miao@marvell.com>

 *

 * 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/mutex.h>

#include <linux/slab.h>

#include <linux/gpio.h>

#include <linux/i2c.h>



#include <linux/mfd/core.h>

#include <linux/mfd/tps6586x.h>



/* GPIO control registers */

#define TPS6586X_GPIOSET1	0x5d

#define TPS6586X_GPIOSET2	0x5e



/* device id */

#define TPS6586X_VERSIONCRC	0xcd

#define TPS658621A_VERSIONCRC	0x15



struct tps6586x {

	struct mutex		lock;

	struct device		*dev;

	struct i2c_client	*client;



	struct gpio_chip	gpio;

};



static inline int __tps6586x_read(struct i2c_client *client,

				  int reg, uint8_t *val)

{

	int ret;



	ret = i2c_smbus_read_byte_data(client, reg);

	if (ret < 0) {

		dev_err(&client->dev, "failed reading at 0x%02x\n", reg);

		return ret;

	}



	*val = (uint8_t)ret;



	return 0;

}



static inline int __tps6586x_reads(struct i2c_client *client, int reg,

				   int len, uint8_t *val)

{

	int ret;



	ret = i2c_smbus_read_i2c_block_data(client, reg, len, val);

	if (ret < 0) {

		dev_err(&client->dev, "failed reading from 0x%02x\n", reg);

		return ret;

	}



	return 0;

}



static inline int __tps6586x_write(struct i2c_client *client,

				 int reg, uint8_t val)

{

	int ret;



	ret = i2c_smbus_write_byte_data(client, reg, val);

	if (ret < 0) {

		dev_err(&client->dev, "failed writing 0x%02x to 0x%02x\n",

				val, reg);

		return ret;

	}



	return 0;

}



static inline int __tps6586x_writes(struct i2c_client *client, int reg,

				  int len, uint8_t *val)

{

	int ret;



	ret = i2c_smbus_write_i2c_block_data(client, reg, len, val);

	if (ret < 0) {

		dev_err(&client->dev, "failed writings to 0x%02x\n", reg);

		return ret;

	}



	return 0;

}



int tps6586x_write(struct device *dev, int reg, uint8_t val)

{

	return __tps6586x_write(to_i2c_client(dev), reg, val);

}

EXPORT_SYMBOL_GPL(tps6586x_write);



int tps6586x_writes(struct device *dev, int reg, int len, uint8_t *val)

{

	return __tps6586x_writes(to_i2c_client(dev), reg, len, val);

}

EXPORT_SYMBOL_GPL(tps6586x_writes);



int tps6586x_read(struct device *dev, int reg, uint8_t *val)

{

	return __tps6586x_read(to_i2c_client(dev), reg, val);

}

EXPORT_SYMBOL_GPL(tps6586x_read);



int tps6586x_reads(struct device *dev, int reg, int len, uint8_t *val)

{

	return __tps6586x_reads(to_i2c_client(dev), reg, len, val);

}

EXPORT_SYMBOL_GPL(tps6586x_reads);



int tps6586x_set_bits(struct device *dev, int reg, uint8_t bit_mask)

{

	struct tps6586x *tps6586x = dev_get_drvdata(dev);

	uint8_t reg_val;

	int ret = 0;



	mutex_lock(&tps6586x->lock);



	ret = __tps6586x_read(to_i2c_client(dev), reg, &reg_val);

	if (ret)

		goto out;



	if ((reg_val & bit_mask) == 0) {

		reg_val |= bit_mask;

		ret = __tps6586x_write(to_i2c_client(dev), reg, reg_val);

	}

out:

	mutex_unlock(&tps6586x->lock);

	return ret;

}

EXPORT_SYMBOL_GPL(tps6586x_set_bits);



int tps6586x_clr_bits(struct device *dev, int reg, uint8_t bit_mask)

{

	struct tps6586x *tps6586x = dev_get_drvdata(dev);

	uint8_t reg_val;

	int ret = 0;



	mutex_lock(&tps6586x->lock);



	ret = __tps6586x_read(to_i2c_client(dev), reg, &reg_val);

	if (ret)

		goto out;



	if (reg_val & bit_mask) {

		reg_val &= ~bit_mask;

		ret = __tps6586x_write(to_i2c_client(dev), reg, reg_val);

	}

out:

	mutex_unlock(&tps6586x->lock);

	return ret;

}

EXPORT_SYMBOL_GPL(tps6586x_clr_bits);



int tps6586x_update(struct device *dev, int reg, uint8_t val, uint8_t mask)

{

	struct tps6586x *tps6586x = dev_get_drvdata(dev);

	uint8_t reg_val;

	int ret = 0;



	mutex_lock(&tps6586x->lock);



	ret = __tps6586x_read(tps6586x->client, reg, &reg_val);

	if (ret)

		goto out;



	if ((reg_val & mask) != val) {

		reg_val = (reg_val & ~mask) | val;

		ret = __tps6586x_write(tps6586x->client, reg, reg_val);

	}

out:

	mutex_unlock(&tps6586x->lock);

	return ret;

}

EXPORT_SYMBOL_GPL(tps6586x_update);



static int tps6586x_gpio_get(struct gpio_chip *gc, unsigned offset)

{

	struct tps6586x *tps6586x = container_of(gc, struct tps6586x, gpio);

	uint8_t val;

	int ret;



	ret = __tps6586x_read(tps6586x->client, TPS6586X_GPIOSET2, &val);

	if (ret)

		return ret;



	return !!(val & (1 << offset));

}





static void tps6586x_gpio_set(struct gpio_chip *chip, unsigned offset,

			      int value)

{

	struct tps6586x *tps6586x = container_of(chip, struct tps6586x, gpio);



	__tps6586x_write(tps6586x->client, TPS6586X_GPIOSET2,

			 value << offset);

}



static int tps6586x_gpio_output(struct gpio_chip *gc, unsigned offset,

				int value)

{

	struct tps6586x *tps6586x = container_of(gc, struct tps6586x, gpio);

	uint8_t val, mask;



	tps6586x_gpio_set(gc, offset, value);



	val = 0x1 << (offset * 2);

	mask = 0x3 << (offset * 2);



	return tps6586x_update(tps6586x->dev, TPS6586X_GPIOSET1, val, mask);

}



static void tps6586x_gpio_init(struct tps6586x *tps6586x, int gpio_base)

{

	int ret;



	if (!gpio_base)

		return;



	tps6586x->gpio.owner		= THIS_MODULE;

	tps6586x->gpio.label		= tps6586x->client->name;

	tps6586x->gpio.dev		= tps6586x->dev;

	tps6586x->gpio.base		= gpio_base;

	tps6586x->gpio.ngpio		= 4;

	tps6586x->gpio.can_sleep	= 1;



	/* FIXME: add handling of GPIOs as dedicated inputs */

	tps6586x->gpio.direction_output	= tps6586x_gpio_output;

	tps6586x->gpio.set		= tps6586x_gpio_set;

	tps6586x->gpio.get		= tps6586x_gpio_get;



	ret = gpiochip_add(&tps6586x->gpio);

	if (ret)

		dev_warn(tps6586x->dev, "GPIO registration failed: %d\n", ret);

}



static int __remove_subdev(struct device *dev, void *unused)

{

	platform_device_unregister(to_platform_device(dev));

	return 0;

}



static int tps6586x_remove_subdevs(struct tps6586x *tps6586x)

{

	return device_for_each_child(tps6586x->dev, NULL, __remove_subdev);

}



static int __devinit tps6586x_add_subdevs(struct tps6586x *tps6586x,

					  struct tps6586x_platform_data *pdata)

{

	struct tps6586x_subdev_info *subdev;

	struct platform_device *pdev;

	int i, ret = 0;



	for (i = 0; i < pdata->num_subdevs; i++) {

		subdev = &pdata->subdevs[i];



		pdev = platform_device_alloc(subdev->name, subdev->id);



		pdev->dev.parent = tps6586x->dev;

		pdev->dev.platform_data = subdev->platform_data;



		ret = platform_device_add(pdev);

		if (ret)

			goto failed;

	}

	return 0;



failed:

	tps6586x_remove_subdevs(tps6586x);

	return ret;

}



static int __devinit tps6586x_i2c_probe(struct i2c_client *client,

					const struct i2c_device_id *id)

{

	struct tps6586x_platform_data *pdata = client->dev.platform_data;

	struct tps6586x *tps6586x;

	int ret;



	if (!pdata) {

		dev_err(&client->dev, "tps6586x requires platform data\n");

		return -ENOTSUPP;

	}



	ret = i2c_smbus_read_byte_data(client, TPS6586X_VERSIONCRC);

	if (ret < 0) {

		dev_err(&client->dev, "Chip ID read failed: %d\n", ret);

		return -EIO;

	}



	if (ret != TPS658621A_VERSIONCRC) {

		dev_err(&client->dev, "Unsupported chip ID: %x\n", ret);

		return -ENODEV;

	}



	tps6586x = kzalloc(sizeof(struct tps6586x), GFP_KERNEL);

	if (tps6586x == NULL)

		return -ENOMEM;



	tps6586x->client = client;

	tps6586x->dev = &client->dev;

	i2c_set_clientdata(client, tps6586x);



	mutex_init(&tps6586x->lock);



	ret = tps6586x_add_subdevs(tps6586x, pdata);

	if (ret) {

		dev_err(&client->dev, "add devices failed: %d\n", ret);

		goto err_add_devs;

	}



	tps6586x_gpio_init(tps6586x, pdata->gpio_base);



	return 0;



err_add_devs:

	kfree(tps6586x);

	return ret;

}



static int __devexit tps6586x_i2c_remove(struct i2c_client *client)

{

	return 0;

}



static const struct i2c_device_id tps6586x_id_table[] = {

	{ "tps6586x", 0 },

	{ },

};

MODULE_DEVICE_TABLE(i2c, tps6586x_id_table);



static struct i2c_driver tps6586x_driver = {

	.driver	= {

		.name	= "tps6586x",

		.owner	= THIS_MODULE,

	},

	.probe		= tps6586x_i2c_probe,

	.remove		= __devexit_p(tps6586x_i2c_remove),

	.id_table	= tps6586x_id_table,

};



static int __init tps6586x_init(void)

{

	return i2c_add_driver(&tps6586x_driver);

}

subsys_initcall(tps6586x_init);



static void __exit tps6586x_exit(void)

{

	i2c_del_driver(&tps6586x_driver);

}

module_exit(tps6586x_exit);



MODULE_DESCRIPTION("TPS6586X core driver");

MODULE_AUTHOR("Mike Rapoport <mike@compulab.co.il>");

MODULE_LICENSE("GPL");

include/linux/mfd/tps6586x.h

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#ifndef __LINUX_MFD_TPS6586X_H

#define __LINUX_MFD_TPS6586X_H



enum {

	TPS6586X_ID_SM_0,

	TPS6586X_ID_SM_1,

	TPS6586X_ID_SM_2,

	TPS6586X_ID_LDO_0,

	TPS6586X_ID_LDO_1,

	TPS6586X_ID_LDO_2,

	TPS6586X_ID_LDO_3,

	TPS6586X_ID_LDO_4,

	TPS6586X_ID_LDO_5,

	TPS6586X_ID_LDO_6,

	TPS6586X_ID_LDO_7,

	TPS6586X_ID_LDO_8,

	TPS6586X_ID_LDO_9,

	TPS6586X_ID_LDO_RTC,

};



struct tps6586x_subdev_info {

	int		id;

	const char	*name;

	void		*platform_data;

};



struct tps6586x_platform_data {

	int num_subdevs;

	struct tps6586x_subdev_info *subdevs;



	int gpio_base;

};



/*

 * NOTE: the functions below are not intended for use outside

 * of the TPS6586X sub-device drivers

 */

extern int tps6586x_write(struct device *dev, int reg, uint8_t val);

extern int tps6586x_writes(struct device *dev, int reg, int len, uint8_t *val);

extern int tps6586x_read(struct device *dev, int reg, uint8_t *val);

extern int tps6586x_reads(struct device *dev, int reg, int len, uint8_t *val);

extern int tps6586x_set_bits(struct device *dev, int reg, uint8_t bit_mask);

extern int tps6586x_clr_bits(struct device *dev, int reg, uint8_t bit_mask);

extern int tps6586x_update(struct device *dev, int reg, uint8_t val,

			   uint8_t mask);



#endif /*__LINUX_MFD_TPS6586X_H */