regulator: Fairchild fan53555 support (49d8c599) · Commits · 戴 / test

drivers/regulator/Kconfig

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		@@ -110,6 +110,17 @@ config REGULATOR_DA9052
		This driver supports the voltage regulators of DA9052-BC and
		DA9053-AA/Bx PMIC.

		config REGULATOR_FAN53555
		tristate "Fairchild FAN53555 Regulator"
		depends on I2C
		select REGMAP_I2C
		help
		This driver supports Fairchild FAN53555 Digitally Programmable
		TinyBuck Regulator. The FAN53555 is a step-down switching voltage
		regulator that delivers a digitally programmable output from an
		input voltage supply of 2.5V to 5.5V. The output voltage is
		programmed through an I2C interface.

		config REGULATOR_ANATOP
		tristate "Freescale i.MX on-chip ANATOP LDO regulators"
		depends on MFD_ANATOP

drivers/regulator/Makefile

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		@@ -20,6 +20,7 @@ obj-$(CONFIG_REGULATOR_DA903X) += da903x.o
		obj-$(CONFIG_REGULATOR_DA9052) += da9052-regulator.o
		obj-$(CONFIG_REGULATOR_DBX500_PRCMU) += dbx500-prcmu.o
		obj-$(CONFIG_REGULATOR_DB8500_PRCMU) += db8500-prcmu.o
		obj-$(CONFIG_REGULATOR_FAN53555) += fan53555.o
		obj-$(CONFIG_REGULATOR_GPIO) += gpio-regulator.o
		obj-$(CONFIG_REGULATOR_ISL6271A) += isl6271a-regulator.o
		obj-$(CONFIG_REGULATOR_LP3971) += lp3971.o

drivers/regulator/fan53555.c

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		/*
		* FAN53555 Fairchild Digitally Programmable TinyBuck Regulator Driver.
		*
		* Supported Part Numbers:
		* FAN53555UC00X/01X/03X/04X/05X
		*
		* Copyright (c) 2012 Marvell Technology Ltd.
		* Yunfan Zhang <yfzhang@marvell.com>
		*
		* This package 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/module.h>
		#include <linux/param.h>
		#include <linux/err.h>
		#include <linux/platform_device.h>
		#include <linux/regulator/driver.h>
		#include <linux/regulator/machine.h>
		#include <linux/i2c.h>
		#include <linux/slab.h>
		#include <linux/regmap.h>
		#include <linux/regulator/fan53555.h>

		/* Voltage setting */
		#define FAN53555_VSEL0 0x00
		#define FAN53555_VSEL1 0x01
		/* Control register */
		#define FAN53555_CONTROL 0x02
		/* IC Type */
		#define FAN53555_ID1 0x03
		/* IC mask version */
		#define FAN53555_ID2 0x04
		/* Monitor register */
		#define FAN53555_MONITOR 0x05

		/* VSEL bit definitions */
		#define VSEL_BUCK_EN (1 << 7)
		#define VSEL_MODE (1 << 6)
		#define VSEL_NSEL_MASK 0x3F
		/* Chip ID and Verison */
		#define DIE_ID 0x0F /* ID1 */
		#define DIE_REV 0x0F /* ID2 */
		/* Control bit definitions */
		#define CTL_OUTPUT_DISCHG (1 << 7)
		#define CTL_SLEW_MASK (0x7 << 4)
		#define CTL_SLEW_SHIFT 4
		#define CTL_RESET (1 << 2)

		#define FAN53555_NVOLTAGES 64 /* Numbers of voltages */

		/* IC Type */
		enum {
		FAN53555_CHIP_ID_00 = 0,
		FAN53555_CHIP_ID_01,
		FAN53555_CHIP_ID_02,
		FAN53555_CHIP_ID_03,
		FAN53555_CHIP_ID_04,
		FAN53555_CHIP_ID_05,
		};

		struct fan53555_device_info {
		struct regmap *regmap;
		struct device *dev;
		struct regulator_desc desc;
		struct regulator_dev *rdev;
		struct regulator_init_data *regulator;
		/* IC Type and Rev */
		int chip_id;
		int chip_rev;
		/* Voltage setting register */
		unsigned int vol_reg;
		unsigned int sleep_reg;
		/* Voltage range and step(linear) */
		unsigned int vsel_min;
		unsigned int vsel_max;
		unsigned int vsel_step;
		/* Voltage slew rate limiting */
		unsigned int slew_rate;
		/* Sleep voltage cache */
		unsigned int sleep_vol_cache;
		};

		static int fan53555_set_suspend_voltage(struct regulator_dev *rdev, int uV)
		{
		struct fan53555_device_info *di = rdev_get_drvdata(rdev);
		int ret;

		if (di->sleep_vol_cache == uV)
		return 0;
		ret = regulator_map_voltage_linear(rdev, uV, uV);
		if (ret < 0)
		return -EINVAL;
		ret = regmap_update_bits(di->regmap, di->sleep_reg,
		VSEL_NSEL_MASK, ret);
		if (ret < 0)
		return -EINVAL;
		/* Cache the sleep voltage setting.
		* Might not be the real voltage which is rounded */
		di->sleep_vol_cache = uV;

		return 0;
		}

		static int fan53555_set_mode(struct regulator_dev *rdev, unsigned int mode)
		{
		struct fan53555_device_info *di = rdev_get_drvdata(rdev);

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

		static unsigned int fan53555_get_mode(struct regulator_dev *rdev)
		{
		struct fan53555_device_info *di = rdev_get_drvdata(rdev);
		unsigned int val;
		int ret = 0;

		ret = regmap_read(di->regmap, di->vol_reg, &val);
		if (ret < 0)
		return ret;
		if (val & VSEL_MODE)
		return REGULATOR_MODE_FAST;
		else
		return REGULATOR_MODE_NORMAL;
		}

		static struct regulator_ops fan53555_regulator_ops = {
		.set_voltage_sel = regulator_set_voltage_sel_regmap,
		.get_voltage_sel = regulator_get_voltage_sel_regmap,
		.map_voltage = regulator_map_voltage_linear,
		.list_voltage = regulator_list_voltage_linear,
		.set_suspend_voltage = fan53555_set_suspend_voltage,
		.enable = regulator_enable_regmap,
		.disable = regulator_disable_regmap,
		.is_enabled = regulator_is_enabled_regmap,
		.set_mode = fan53555_set_mode,
		.get_mode = fan53555_get_mode,
		};

		/* For 00,01,03,05 options:
		* VOUT = 0.60V + NSELx * 10mV, from 0.60 to 1.23V.
		* For 04 option:
		* VOUT = 0.603V + NSELx * 12.826mV, from 0.603 to 1.411V.
		* */
		static int fan53555_device_setup(struct fan53555_device_info *di,
		struct fan53555_platform_data *pdata)
		{
		unsigned int reg, data, mask;

		/* Setup voltage control register */
		switch (pdata->sleep_vsel_id) {
		case FAN53555_VSEL_ID_0:
		di->sleep_reg = FAN53555_VSEL0;
		di->vol_reg = FAN53555_VSEL1;
		break;
		case FAN53555_VSEL_ID_1:
		di->sleep_reg = FAN53555_VSEL1;
		di->vol_reg = FAN53555_VSEL0;
		break;
		default:
		dev_err(di->dev, "Invalid VSEL ID!\n");
		return -EINVAL;
		}
		/* Init voltage range and step */
		switch (di->chip_id) {
		case FAN53555_CHIP_ID_00:
		case FAN53555_CHIP_ID_01:
		case FAN53555_CHIP_ID_03:
		case FAN53555_CHIP_ID_05:
		di->vsel_min = 600000;
		di->vsel_max = 1230000;
		di->vsel_step = 10000;
		break;
		case FAN53555_CHIP_ID_04:
		di->vsel_min = 603000;
		di->vsel_max = 1411000;
		di->vsel_step = 12826;
		break;
		default:
		dev_err(di->dev,
		"Chip ID[%d]\n not supported!\n", di->chip_id);
		return -EINVAL;
		}
		/* Init slew rate */
		if (pdata->slew_rate & 0x7)
		di->slew_rate = pdata->slew_rate;
		else
		di->slew_rate = FAN53555_SLEW_RATE_64MV;
		reg = FAN53555_CONTROL;
		data = di->slew_rate << CTL_SLEW_SHIFT;
		mask = CTL_SLEW_MASK;
		return regmap_update_bits(di->regmap, reg, mask, data);
		}

		static int fan53555_regulator_register(struct fan53555_device_info *di,
		struct regulator_config *config)
		{
		struct regulator_desc *rdesc = &di->desc;

		rdesc->name = "fan53555-reg";
		rdesc->ops = &fan53555_regulator_ops;
		rdesc->type = REGULATOR_VOLTAGE;
		rdesc->n_voltages = FAN53555_NVOLTAGES;
		rdesc->enable_reg = di->vol_reg;
		rdesc->enable_mask = VSEL_BUCK_EN;
		rdesc->min_uV = di->vsel_min;
		rdesc->uV_step = di->vsel_step;
		rdesc->vsel_reg = di->vol_reg;
		rdesc->vsel_mask = VSEL_NSEL_MASK;
		rdesc->owner = THIS_MODULE;

		di->rdev = regulator_register(&di->desc, config);
		if (IS_ERR(di->rdev))
		return PTR_ERR(di->rdev);
		return 0;

		}

		static struct regmap_config fan53555_regmap_config = {
		.reg_bits = 8,
		.val_bits = 8,
		};

		static int __devinit fan53555_regulator_probe(struct i2c_client *client,
		const struct i2c_device_id *id)
		{
		struct fan53555_device_info *di;
		struct fan53555_platform_data *pdata;
		struct regulator_config config = { };
		unsigned int val;
		int ret;

		pdata = client->dev.platform_data;
		if (!pdata \|\| !pdata->regulator) {
		dev_err(&client->dev, "Platform data not found!\n");
		return -ENODEV;
		}

		di = devm_kzalloc(&client->dev, sizeof(struct fan53555_device_info),
		GFP_KERNEL);
		if (!di) {
		dev_err(&client->dev, "Failed to allocate device info data!\n");
		return -ENOMEM;
		}
		di->regmap = devm_regmap_init_i2c(client, &fan53555_regmap_config);
		if (IS_ERR(di->regmap)) {
		dev_err(&client->dev, "Failed to allocate regmap!\n");
		return PTR_ERR(di->regmap);
		}
		di->dev = &client->dev;
		di->regulator = pdata->regulator;
		i2c_set_clientdata(client, di);
		/* Get chip ID */
		ret = regmap_read(di->regmap, FAN53555_ID1, &val);
		if (ret < 0) {
		dev_err(&client->dev, "Failed to get chip ID!\n");
		return -ENODEV;
		}
		di->chip_id = val & DIE_ID;
		/* Get chip revision */
		ret = regmap_read(di->regmap, FAN53555_ID2, &val);
		if (ret < 0) {
		dev_err(&client->dev, "Failed to get chip Rev!\n");
		return -ENODEV;
		}
		di->chip_rev = val & DIE_REV;
		dev_info(&client->dev, "FAN53555 Option[%d] Rev[%d] Detected!\n",
		di->chip_id, di->chip_rev);
		/* Device init */
		ret = fan53555_device_setup(di, pdata);
		if (ret < 0) {
		dev_err(&client->dev, "Failed to setup device!\n");
		return ret;
		}
		/* Register regulator */
		config.dev = di->dev;
		config.init_data = di->regulator;
		config.regmap = di->regmap;
		config.driver_data = di;
		ret = fan53555_regulator_register(di, &config);
		if (ret < 0)
		dev_err(&client->dev, "Failed to register regulator!\n");
		return ret;

		}

		static int __devexit fan53555_regulator_remove(struct i2c_client *client)
		{
		struct fan53555_device_info *di = i2c_get_clientdata(client);

		regulator_unregister(di->rdev);
		return 0;
		}

		static const struct i2c_device_id fan53555_id[] = {
		{"fan53555", -1},
		{ },
		};

		static struct i2c_driver fan53555_regulator_driver = {
		.driver = {
		.name = "fan53555-regulator",
		},
		.probe = fan53555_regulator_probe,
		.remove = __devexit_p(fan53555_regulator_remove),
		.id_table = fan53555_id,
		};

		module_i2c_driver(fan53555_regulator_driver);

		MODULE_AUTHOR("Yunfan Zhang <yfzhang@marvell.com>");
		MODULE_DESCRIPTION("FAN53555 regulator driver");
		MODULE_LICENSE("GPL v2");

include/linux/regulator/fan53555.h

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		/*
		* fan53555.h - Fairchild Regulator FAN53555 Driver
		*
		* Copyright (C) 2012 Marvell Technology Ltd.
		* Yunfan Zhang <yfzhang@marvell.com>
		*
		* This package 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.
		*
		*/

		#ifndef __FAN53555_H__

		/* VSEL ID */
		enum {
		FAN53555_VSEL_ID_0 = 0,
		FAN53555_VSEL_ID_1,
		};

		/* Transition slew rate limiting from a low to high voltage.
		* -----------------------
		* Bin \|Slew Rate(mV/uS)
		* ------\|----------------
		* 000 \| 64.00
		* ------\|----------------
		* 001 \| 32.00
		* ------\|----------------
		* 010 \| 16.00
		* ------\|----------------
		* 011 \| 8.00
		* ------\|----------------
		* 100 \| 4.00
		* ------\|----------------
		* 101 \| 2.00
		* ------\|----------------
		* 110 \| 1.00
		* ------\|----------------
		* 111 \| 0.50
		* -----------------------
		*/
		enum {
		FAN53555_SLEW_RATE_64MV = 0,
		FAN53555_SLEW_RATE_32MV,
		FAN53555_SLEW_RATE_16MV,
		FAN53555_SLEW_RATE_8MV,
		FAN53555_SLEW_RATE_4MV,
		FAN53555_SLEW_RATE_2MV,
		FAN53555_SLEW_RATE_1MV,
		FAN53555_SLEW_RATE_0_5MV,
		};

		struct fan53555_platform_data {
		struct regulator_init_data *regulator;
		unsigned int slew_rate;
		/* Sleep VSEL ID */
		unsigned int sleep_vsel_id;
		};

		#endif /* __FAN53555_H__ */

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