drivers/regulator/max8649.c - kernel/windcharger - Git at Google

 /*
  * Regulators driver for Maxim max8649
  *
  * Copyright (C) 2009-2010 Marvell International Ltd.
  *      Haojian Zhuang <haojian.zhuang@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/err.h>
 #include <linux/i2c.h>
 #include <linux/platform_device.h>
 #include <linux/regulator/driver.h>
 #include <linux/slab.h>
 #include <linux/regulator/max8649.h>
 #include <linux/regmap.h>

 #define MAX8649_DCDC_VMIN	750000		/* uV */
 #define MAX8649_DCDC_VMAX	1380000		/* uV */
 #define MAX8649_DCDC_STEP	10000		/* uV */
 #define MAX8649_VOL_MASK	0x3f

 /* Registers */
 #define MAX8649_MODE0		0x00
 #define MAX8649_MODE1		0x01
 #define MAX8649_MODE2		0x02
 #define MAX8649_MODE3		0x03
 #define MAX8649_CONTROL		0x04
 #define MAX8649_SYNC		0x05
 #define MAX8649_RAMP		0x06
 #define MAX8649_CHIP_ID1	0x08
 #define MAX8649_CHIP_ID2	0x09

 /* Bits */
 #define MAX8649_EN_PD		(1 << 7)
 #define MAX8649_VID0_PD		(1 << 6)
 #define MAX8649_VID1_PD		(1 << 5)
 #define MAX8649_VID_MASK	(3 << 5)

 #define MAX8649_FORCE_PWM	(1 << 7)
 #define MAX8649_SYNC_EXTCLK	(1 << 6)

 #define MAX8649_EXT_MASK	(3 << 6)

 #define MAX8649_RAMP_MASK	(7 << 5)
 #define MAX8649_RAMP_DOWN	(1 << 1)

 struct max8649_regulator_info {
 	struct regulator_dev	*regulator;
 	struct device		*dev;
 	struct regmap		*regmap;

 	int		vol_reg;
 	unsigned	mode:2;	/* bit[1:0] = VID1, VID0 */
 	unsigned	extclk_freq:2;
 	unsigned	extclk:1;
 	unsigned	ramp_timing:3;
 	unsigned	ramp_down:1;
 };

 /* I2C operations */

 static inline int check_range(int min_uV, int max_uV)
 {
 	if ((min_uV < MAX8649_DCDC_VMIN) || (max_uV > MAX8649_DCDC_VMAX)
 		|| (min_uV > max_uV))
 		return -EINVAL;
 	return 0;
 }

 static int max8649_list_voltage(struct regulator_dev *rdev, unsigned index)
 {
 	return (MAX8649_DCDC_VMIN + index * MAX8649_DCDC_STEP);
 }

 static int max8649_get_voltage(struct regulator_dev *rdev)
 {
 	struct max8649_regulator_info *info = rdev_get_drvdata(rdev);
 	unsigned int val;
 	unsigned char data;
 	int ret;

 	ret = regmap_read(info->regmap, info->vol_reg, &val);
 	if (ret != 0)
 		return ret;
 	data = (unsigned char)val & MAX8649_VOL_MASK;
 	return max8649_list_voltage(rdev, data);
 }

 static int max8649_set_voltage(struct regulator_dev *rdev,
 			       int min_uV, int max_uV, unsigned *selector)
 {
 	struct max8649_regulator_info *info = rdev_get_drvdata(rdev);
 	unsigned char data, mask;

 	if (check_range(min_uV, max_uV)) {
 		dev_err(info->dev, "invalid voltage range (%d, %d) uV\n",
 			min_uV, max_uV);
 		return -EINVAL;
 	}
 	data = (min_uV - MAX8649_DCDC_VMIN + MAX8649_DCDC_STEP - 1)
 		/ MAX8649_DCDC_STEP;
 	mask = MAX8649_VOL_MASK;
 	*selector = data & mask;

 	return regmap_update_bits(info->regmap, info->vol_reg, mask, data);
 }

 /* EN_PD means pulldown on EN input */
 static int max8649_enable(struct regulator_dev *rdev)
 {
 	struct max8649_regulator_info *info = rdev_get_drvdata(rdev);
 	return regmap_update_bits(info->regmap, MAX8649_CONTROL, MAX8649_EN_PD, 0);
 }

 /*
  * Applied internal pulldown resistor on EN input pin.
  * If pulldown EN pin outside, it would be better.
  */
 static int max8649_disable(struct regulator_dev *rdev)
 {
 	struct max8649_regulator_info *info = rdev_get_drvdata(rdev);
 	return regmap_update_bits(info->regmap, MAX8649_CONTROL, MAX8649_EN_PD,
 				MAX8649_EN_PD);
 }

 static int max8649_is_enabled(struct regulator_dev *rdev)
 {
 	struct max8649_regulator_info *info = rdev_get_drvdata(rdev);
 	unsigned int val;
 	int ret;

 	ret = regmap_read(info->regmap, MAX8649_CONTROL, &val);
 	if (ret != 0)
 		return ret;
 	return !((unsigned char)val & MAX8649_EN_PD);
 }

 static int max8649_enable_time(struct regulator_dev *rdev)
 {
 	struct max8649_regulator_info *info = rdev_get_drvdata(rdev);
 	int voltage, rate, ret;
 	unsigned int val;

 	/* get voltage */
 	ret = regmap_read(info->regmap, info->vol_reg, &val);
 	if (ret != 0)
 		return ret;
 	val &= MAX8649_VOL_MASK;
 	voltage = max8649_list_voltage(rdev, (unsigned char)val); /* uV */

 	/* get rate */
 	ret = regmap_read(info->regmap, MAX8649_RAMP, &val);
 	if (ret != 0)
 		return ret;
 	ret = (val & MAX8649_RAMP_MASK) >> 5;
 	rate = (32 * 1000) >> ret;	/* uV/uS */

 	return DIV_ROUND_UP(voltage, rate);
 }

 static int max8649_set_mode(struct regulator_dev *rdev, unsigned int mode)
 {
 	struct max8649_regulator_info *info = rdev_get_drvdata(rdev);

 	switch (mode) {
 	case REGULATOR_MODE_FAST:
 		regmap_update_bits(info->regmap, info->vol_reg, MAX8649_FORCE_PWM,
 				   MAX8649_FORCE_PWM);
 		break;
 	case REGULATOR_MODE_NORMAL:
 		regmap_update_bits(info->regmap, info->vol_reg,
 				   MAX8649_FORCE_PWM, 0);
 		break;
 	default:
 		return -EINVAL;
 	}
 	return 0;
 }

 static unsigned int max8649_get_mode(struct regulator_dev *rdev)
 {
 	struct max8649_regulator_info *info = rdev_get_drvdata(rdev);
 	unsigned int val;
 	int ret;

 	ret = regmap_read(info->regmap, info->vol_reg, &val);
 	if (ret != 0)
 		return ret;
 	if (val & MAX8649_FORCE_PWM)
 		return REGULATOR_MODE_FAST;
 	return REGULATOR_MODE_NORMAL;
 }

 static struct regulator_ops max8649_dcdc_ops = {
 	.set_voltage	= max8649_set_voltage,
 	.get_voltage	= max8649_get_voltage,
 	.list_voltage	= max8649_list_voltage,
 	.enable		= max8649_enable,
 	.disable	= max8649_disable,
 	.is_enabled	= max8649_is_enabled,
 	.enable_time	= max8649_enable_time,
 	.set_mode	= max8649_set_mode,
 	.get_mode	= max8649_get_mode,

 };

 static struct regulator_desc dcdc_desc = {
 	.name		= "max8649",
 	.ops		= &max8649_dcdc_ops,
 	.type		= REGULATOR_VOLTAGE,
 	.n_voltages	= 1 << 6,
 	.owner		= THIS_MODULE,
 };

 static struct regmap_config max8649_regmap_config = {
 	.reg_bits = 8,
 	.val_bits = 8,
 };

 static int __devinit max8649_regulator_probe(struct i2c_client *client,
 					     const struct i2c_device_id *id)
 {
 	struct max8649_platform_data *pdata = client->dev.platform_data;
 	struct max8649_regulator_info *info = NULL;
 	unsigned int val;
 	unsigned char data;
 	int ret;

 	info = kzalloc(sizeof(struct max8649_regulator_info), GFP_KERNEL);
 	if (!info) {
 		dev_err(&client->dev, "No enough memory\n");
 		return -ENOMEM;
 	}

 	info->regmap = regmap_init_i2c(client, &max8649_regmap_config);
 	if (IS_ERR(info->regmap)) {
 		ret = PTR_ERR(info->regmap);
 		dev_err(&client->dev, "Failed to allocate register map: %d\n", ret);
 		goto fail;
 	}

 	info->dev = &client->dev;
 	i2c_set_clientdata(client, info);

 	info->mode = pdata->mode;
 	switch (info->mode) {
 	case 0:
 		info->vol_reg = MAX8649_MODE0;
 		break;
 	case 1:
 		info->vol_reg = MAX8649_MODE1;
 		break;
 	case 2:
 		info->vol_reg = MAX8649_MODE2;
 		break;
 	case 3:
 		info->vol_reg = MAX8649_MODE3;
 		break;
 	default:
 		break;
 	}

 	ret = regmap_read(info->regmap, MAX8649_CHIP_ID1, &val);
 	if (ret != 0) {
 		dev_err(info->dev, "Failed to detect ID of MAX8649:%d\n",
 			ret);
 		goto out;
 	}
 	dev_info(info->dev, "Detected MAX8649 (ID:%x)\n", ret);

 	/* enable VID0 & VID1 */
 	regmap_update_bits(info->regmap, MAX8649_CONTROL, MAX8649_VID_MASK, 0);

 	/* enable/disable external clock synchronization */
 	info->extclk = pdata->extclk;
 	data = (info->extclk) ? MAX8649_SYNC_EXTCLK : 0;
 	regmap_update_bits(info->regmap, info->vol_reg, MAX8649_SYNC_EXTCLK, data);
 	if (info->extclk) {
 		/* set external clock frequency */
 		info->extclk_freq = pdata->extclk_freq;
 		regmap_update_bits(info->regmap, MAX8649_SYNC, MAX8649_EXT_MASK,
 				   info->extclk_freq << 6);
 	}

 	if (pdata->ramp_timing) {
 		info->ramp_timing = pdata->ramp_timing;
 		regmap_update_bits(info->regmap, MAX8649_RAMP, MAX8649_RAMP_MASK,
 				   info->ramp_timing << 5);
 	}

 	info->ramp_down = pdata->ramp_down;
 	if (info->ramp_down) {
 		regmap_update_bits(info->regmap, MAX8649_RAMP, MAX8649_RAMP_DOWN,
 				   MAX8649_RAMP_DOWN);
 	}

 	info->regulator = regulator_register(&dcdc_desc, &client->dev,
 					     pdata->regulator, info, NULL);
 	if (IS_ERR(info->regulator)) {
 		dev_err(info->dev, "failed to register regulator %s\n",
 			dcdc_desc.name);
 		ret = PTR_ERR(info->regulator);
 		goto out;
 	}

 	dev_info(info->dev, "Max8649 regulator device is detected.\n");
 	return 0;
 out:
 	regmap_exit(info->regmap);
 fail:
 	kfree(info);
 	return ret;
 }

 static int __devexit max8649_regulator_remove(struct i2c_client *client)
 {
 	struct max8649_regulator_info *info = i2c_get_clientdata(client);

 	if (info) {
 		if (info->regulator)
 			regulator_unregister(info->regulator);
 		regmap_exit(info->regmap);
 		kfree(info);
 	}

 	return 0;
 }

 static const struct i2c_device_id max8649_id[] = {
 	{ "max8649", 0 },
 	{ }
 };
 MODULE_DEVICE_TABLE(i2c, max8649_id);

 static struct i2c_driver max8649_driver = {
 	.probe		= max8649_regulator_probe,
 	.remove		= __devexit_p(max8649_regulator_remove),
 	.driver		= {
 		.name	= "max8649",
 	},
 	.id_table	= max8649_id,
 };

 static int __init max8649_init(void)
 {
 	return i2c_add_driver(&max8649_driver);
 }
 subsys_initcall(max8649_init);

 static void __exit max8649_exit(void)
 {
 	i2c_del_driver(&max8649_driver);
 }
 module_exit(max8649_exit);

 /* Module information */
 MODULE_DESCRIPTION("MAXIM 8649 voltage regulator driver");
 MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>");
 MODULE_LICENSE("GPL");
	/*
	* Regulators driver for Maxim max8649
	*
	* Copyright (C) 2009-2010 Marvell International Ltd.
	* Haojian Zhuang <haojian.zhuang@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/err.h>
	#include <linux/i2c.h>
	#include <linux/platform_device.h>
	#include <linux/regulator/driver.h>
	#include <linux/slab.h>
	#include <linux/regulator/max8649.h>
	#include <linux/regmap.h>

	#define MAX8649_DCDC_VMIN 750000 /* uV */
	#define MAX8649_DCDC_VMAX 1380000 /* uV */
	#define MAX8649_DCDC_STEP 10000 /* uV */
	#define MAX8649_VOL_MASK 0x3f

	/* Registers */
	#define MAX8649_MODE0 0x00
	#define MAX8649_MODE1 0x01
	#define MAX8649_MODE2 0x02
	#define MAX8649_MODE3 0x03
	#define MAX8649_CONTROL 0x04
	#define MAX8649_SYNC 0x05
	#define MAX8649_RAMP 0x06
	#define MAX8649_CHIP_ID1 0x08
	#define MAX8649_CHIP_ID2 0x09

	/* Bits */
	#define MAX8649_EN_PD (1 << 7)
	#define MAX8649_VID0_PD (1 << 6)
	#define MAX8649_VID1_PD (1 << 5)
	#define MAX8649_VID_MASK (3 << 5)

	#define MAX8649_FORCE_PWM (1 << 7)
	#define MAX8649_SYNC_EXTCLK (1 << 6)

	#define MAX8649_EXT_MASK (3 << 6)

	#define MAX8649_RAMP_MASK (7 << 5)
	#define MAX8649_RAMP_DOWN (1 << 1)

	struct max8649_regulator_info {
	struct regulator_dev *regulator;
	struct device *dev;
	struct regmap *regmap;

	int vol_reg;
	unsigned mode:2; /* bit[1:0] = VID1, VID0 */
	unsigned extclk_freq:2;
	unsigned extclk:1;
	unsigned ramp_timing:3;
	unsigned ramp_down:1;
	};

	/* I2C operations */

	static inline int check_range(int min_uV, int max_uV)
	{
	if ((min_uV < MAX8649_DCDC_VMIN) \|\| (max_uV > MAX8649_DCDC_VMAX)
	\|\| (min_uV > max_uV))
	return -EINVAL;
	return 0;
	}

	static int max8649_list_voltage(struct regulator_dev *rdev, unsigned index)
	{
	return (MAX8649_DCDC_VMIN + index * MAX8649_DCDC_STEP);
	}

	static int max8649_get_voltage(struct regulator_dev *rdev)
	{
	struct max8649_regulator_info *info = rdev_get_drvdata(rdev);
	unsigned int val;
	unsigned char data;
	int ret;

	ret = regmap_read(info->regmap, info->vol_reg, &val);
	if (ret != 0)
	return ret;
	data = (unsigned char)val & MAX8649_VOL_MASK;
	return max8649_list_voltage(rdev, data);
	}

	static int max8649_set_voltage(struct regulator_dev *rdev,
	int min_uV, int max_uV, unsigned *selector)
	{
	struct max8649_regulator_info *info = rdev_get_drvdata(rdev);
	unsigned char data, mask;

	if (check_range(min_uV, max_uV)) {
	dev_err(info->dev, "invalid voltage range (%d, %d) uV\n",
	min_uV, max_uV);
	return -EINVAL;
	}
	data = (min_uV - MAX8649_DCDC_VMIN + MAX8649_DCDC_STEP - 1)
	/ MAX8649_DCDC_STEP;
	mask = MAX8649_VOL_MASK;
	*selector = data & mask;

	return regmap_update_bits(info->regmap, info->vol_reg, mask, data);
	}

	/* EN_PD means pulldown on EN input */
	static int max8649_enable(struct regulator_dev *rdev)
	{
	struct max8649_regulator_info *info = rdev_get_drvdata(rdev);
	return regmap_update_bits(info->regmap, MAX8649_CONTROL, MAX8649_EN_PD, 0);
	}

	/*
	* Applied internal pulldown resistor on EN input pin.
	* If pulldown EN pin outside, it would be better.
	*/
	static int max8649_disable(struct regulator_dev *rdev)
	{
	struct max8649_regulator_info *info = rdev_get_drvdata(rdev);
	return regmap_update_bits(info->regmap, MAX8649_CONTROL, MAX8649_EN_PD,
	MAX8649_EN_PD);
	}

	static int max8649_is_enabled(struct regulator_dev *rdev)
	{
	struct max8649_regulator_info *info = rdev_get_drvdata(rdev);
	unsigned int val;
	int ret;

	ret = regmap_read(info->regmap, MAX8649_CONTROL, &val);
	if (ret != 0)
	return ret;
	return !((unsigned char)val & MAX8649_EN_PD);
	}

	static int max8649_enable_time(struct regulator_dev *rdev)
	{
	struct max8649_regulator_info *info = rdev_get_drvdata(rdev);
	int voltage, rate, ret;
	unsigned int val;

	/* get voltage */
	ret = regmap_read(info->regmap, info->vol_reg, &val);
	if (ret != 0)
	return ret;
	val &= MAX8649_VOL_MASK;
	voltage = max8649_list_voltage(rdev, (unsigned char)val); /* uV */

	/* get rate */
	ret = regmap_read(info->regmap, MAX8649_RAMP, &val);
	if (ret != 0)
	return ret;
	ret = (val & MAX8649_RAMP_MASK) >> 5;
	rate = (32 * 1000) >> ret; /* uV/uS */

	return DIV_ROUND_UP(voltage, rate);
	}

	static int max8649_set_mode(struct regulator_dev *rdev, unsigned int mode)
	{
	struct max8649_regulator_info *info = rdev_get_drvdata(rdev);

	switch (mode) {
	case REGULATOR_MODE_FAST:
	regmap_update_bits(info->regmap, info->vol_reg, MAX8649_FORCE_PWM,
	MAX8649_FORCE_PWM);
	break;
	case REGULATOR_MODE_NORMAL:
	regmap_update_bits(info->regmap, info->vol_reg,
	MAX8649_FORCE_PWM, 0);
	break;
	default:
	return -EINVAL;
	}
	return 0;
	}

	static unsigned int max8649_get_mode(struct regulator_dev *rdev)
	{
	struct max8649_regulator_info *info = rdev_get_drvdata(rdev);
	unsigned int val;
	int ret;

	ret = regmap_read(info->regmap, info->vol_reg, &val);
	if (ret != 0)
	return ret;
	if (val & MAX8649_FORCE_PWM)
	return REGULATOR_MODE_FAST;
	return REGULATOR_MODE_NORMAL;
	}

	static struct regulator_ops max8649_dcdc_ops = {
	.set_voltage = max8649_set_voltage,
	.get_voltage = max8649_get_voltage,
	.list_voltage = max8649_list_voltage,
	.enable = max8649_enable,
	.disable = max8649_disable,
	.is_enabled = max8649_is_enabled,
	.enable_time = max8649_enable_time,
	.set_mode = max8649_set_mode,
	.get_mode = max8649_get_mode,

	};

	static struct regulator_desc dcdc_desc = {
	.name = "max8649",
	.ops = &max8649_dcdc_ops,
	.type = REGULATOR_VOLTAGE,
	.n_voltages = 1 << 6,
	.owner = THIS_MODULE,
	};

	static struct regmap_config max8649_regmap_config = {
	.reg_bits = 8,
	.val_bits = 8,
	};

	static int __devinit max8649_regulator_probe(struct i2c_client *client,
	const struct i2c_device_id *id)
	{
	struct max8649_platform_data *pdata = client->dev.platform_data;
	struct max8649_regulator_info *info = NULL;
	unsigned int val;
	unsigned char data;
	int ret;

	info = kzalloc(sizeof(struct max8649_regulator_info), GFP_KERNEL);
	if (!info) {
	dev_err(&client->dev, "No enough memory\n");
	return -ENOMEM;
	}

	info->regmap = regmap_init_i2c(client, &max8649_regmap_config);
	if (IS_ERR(info->regmap)) {
	ret = PTR_ERR(info->regmap);
	dev_err(&client->dev, "Failed to allocate register map: %d\n", ret);
	goto fail;
	}

	info->dev = &client->dev;
	i2c_set_clientdata(client, info);

	info->mode = pdata->mode;
	switch (info->mode) {
	case 0:
	info->vol_reg = MAX8649_MODE0;
	break;
	case 1:
	info->vol_reg = MAX8649_MODE1;
	break;
	case 2:
	info->vol_reg = MAX8649_MODE2;
	break;
	case 3:
	info->vol_reg = MAX8649_MODE3;
	break;
	default:
	break;
	}

	ret = regmap_read(info->regmap, MAX8649_CHIP_ID1, &val);
	if (ret != 0) {
	dev_err(info->dev, "Failed to detect ID of MAX8649:%d\n",
	ret);
	goto out;
	}
	dev_info(info->dev, "Detected MAX8649 (ID:%x)\n", ret);

	/* enable VID0 & VID1 */
	regmap_update_bits(info->regmap, MAX8649_CONTROL, MAX8649_VID_MASK, 0);

	/* enable/disable external clock synchronization */
	info->extclk = pdata->extclk;
	data = (info->extclk) ? MAX8649_SYNC_EXTCLK : 0;
	regmap_update_bits(info->regmap, info->vol_reg, MAX8649_SYNC_EXTCLK, data);
	if (info->extclk) {
	/* set external clock frequency */
	info->extclk_freq = pdata->extclk_freq;
	regmap_update_bits(info->regmap, MAX8649_SYNC, MAX8649_EXT_MASK,
	info->extclk_freq << 6);
	}

	if (pdata->ramp_timing) {
	info->ramp_timing = pdata->ramp_timing;
	regmap_update_bits(info->regmap, MAX8649_RAMP, MAX8649_RAMP_MASK,
	info->ramp_timing << 5);
	}

	info->ramp_down = pdata->ramp_down;
	if (info->ramp_down) {
	regmap_update_bits(info->regmap, MAX8649_RAMP, MAX8649_RAMP_DOWN,
	MAX8649_RAMP_DOWN);
	}

	info->regulator = regulator_register(&dcdc_desc, &client->dev,
	pdata->regulator, info, NULL);
	if (IS_ERR(info->regulator)) {
	dev_err(info->dev, "failed to register regulator %s\n",
	dcdc_desc.name);
	ret = PTR_ERR(info->regulator);
	goto out;
	}

	dev_info(info->dev, "Max8649 regulator device is detected.\n");
	return 0;
	out:
	regmap_exit(info->regmap);
	fail:
	kfree(info);
	return ret;
	}

	static int __devexit max8649_regulator_remove(struct i2c_client *client)
	{
	struct max8649_regulator_info *info = i2c_get_clientdata(client);

	if (info) {
	if (info->regulator)
	regulator_unregister(info->regulator);
	regmap_exit(info->regmap);
	kfree(info);
	}

	return 0;
	}

	static const struct i2c_device_id max8649_id[] = {
	{ "max8649", 0 },
	{ }
	};
	MODULE_DEVICE_TABLE(i2c, max8649_id);

	static struct i2c_driver max8649_driver = {
	.probe = max8649_regulator_probe,
	.remove = __devexit_p(max8649_regulator_remove),
	.driver = {
	.name = "max8649",
	},
	.id_table = max8649_id,
	};

	static int __init max8649_init(void)
	{
	return i2c_add_driver(&max8649_driver);
	}
	subsys_initcall(max8649_init);

	static void __exit max8649_exit(void)
	{
	i2c_del_driver(&max8649_driver);
	}
	module_exit(max8649_exit);

	/* Module information */
	MODULE_DESCRIPTION("MAXIM 8649 voltage regulator driver");
	MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>");
	MODULE_LICENSE("GPL");