Date:	Tue, 27 Jul 2010 13:53:43 +0300
From:	Mike Rapoport <mike@...pulab.co.il>
To:	Samuel Ortiz <sameo@...ux.intel.com>
CC:	linux-kernel@...r.kernel.org, Jean Delvare <khali@...ux-fr.org>
Subject: Re: [PATCH] mfd: add TPS6586x driver

(adding Jean to CC)

Mike Rapoport wrote:
> 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: Mike Rapoport <mike@...pulab.co.il>
> ---
>  drivers/mfd/Kconfig          |   14 ++
>  drivers/mfd/Makefile         |    1 +
>  drivers/mfd/tps6586x.c       |  375 ++++++++++++++++++++++++++++++++++++++++++
>  include/linux/mfd/tps6586x.h |   47 ++++++
>  4 files changed, 437 insertions(+), 0 deletions(-)
>  create mode 100644 drivers/mfd/tps6586x.c
>  create mode 100644 include/linux/mfd/tps6586x.h
> 
> diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
> index 9da0e50..b6ee6cf 100644
> --- a/drivers/mfd/Kconfig
> +++ b/drivers/mfd/Kconfig
> @@ -482,6 +482,20 @@ config MFD_JANZ_CMODIO
>  	  host many different types of MODULbus daughterboards, including
>  	  CAN and GPIO controllers.
>  
> +config MFD_TPS6586X
> +	tristate "TPS6586x Power Management chips"
> +	depends on I2C
> +	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"
> diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
> index fb503e7..fefc1d3 100644
> --- a/drivers/mfd/Makefile
> +++ b/drivers/mfd/Makefile
> @@ -71,3 +71,4 @@ obj-$(CONFIG_PMIC_ADP5520)	+= adp5520.o
>  obj-$(CONFIG_LPC_SCH)		+= lpc_sch.o
>  obj-$(CONFIG_MFD_RDC321X)	+= rdc321x-southbridge.o
>  obj-$(CONFIG_MFD_JANZ_CMODIO)	+= janz-cmodio.o
> +obj-$(CONFIG_MFD_TPS6586X)	+= tps6586x.o
> diff --git a/drivers/mfd/tps6586x.c b/drivers/mfd/tps6586x.c
> new file mode 100644
> index 0000000..be514e5
> --- /dev/null
> +++ b/drivers/mfd/tps6586x.c
> @@ -0,0 +1,375 @@
> +/*
> + * Core driver for TI TPS6586x PMIC family
> + *
> + * Copyright (c) 2010 CompuLab Ltd.
> + * Mike Rapoport <mike@...pulab.co.il>
> + *
> + * Based on da903x.c.
> + * Copyright (C) 2008 Compulab, Ltd.
> + * Mike Rapoport <mike@...pulab.co.il>
> + * Copyright (C) 2006-2008 Marvell International Ltd.
> + * Eric Miao <eric.miao@...vell.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_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_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_probe,
> +	.remove		= __devexit_p(tps6586x_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@...pulab.co.il>");
> +MODULE_LICENSE("GPL");
> +
> diff --git a/include/linux/mfd/tps6586x.h b/include/linux/mfd/tps6586x.h
> new file mode 100644
> index 0000000..772b3ae
> --- /dev/null
> +++ b/include/linux/mfd/tps6586x.h
> @@ -0,0 +1,47 @@
> +#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 */


-- 
Sincerely yours,
Mike.
--
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