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regulator: Fairchild fan53555 support
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. Signed-off-by: Yunfan Zhang <yfzhang@marvell.com> Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
This commit is contained in:
Yunfan Zhang
Mark Brown
parent
029dd3cefa
commit
49d8c59927
@ -110,6 +110,17 @@ config REGULATOR_DA9052
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This driver supports the voltage regulators of DA9052-BC and
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DA9053-AA/Bx PMIC.
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config REGULATOR_FAN53555
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tristate "Fairchild FAN53555 Regulator"
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depends on I2C
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select REGMAP_I2C
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help
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This driver supports Fairchild FAN53555 Digitally Programmable
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TinyBuck Regulator. The FAN53555 is a step-down switching voltage
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regulator that delivers a digitally programmable output from an
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input voltage supply of 2.5V to 5.5V. The output voltage is
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programmed through an I2C interface.
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config REGULATOR_ANATOP
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tristate "Freescale i.MX on-chip ANATOP LDO regulators"
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depends on MFD_ANATOP
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@ -20,6 +20,7 @@ obj-$(CONFIG_REGULATOR_DA903X) += da903x.o
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obj-$(CONFIG_REGULATOR_DA9052) += da9052-regulator.o
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obj-$(CONFIG_REGULATOR_DBX500_PRCMU) += dbx500-prcmu.o
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obj-$(CONFIG_REGULATOR_DB8500_PRCMU) += db8500-prcmu.o
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obj-$(CONFIG_REGULATOR_FAN53555) += fan53555.o
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obj-$(CONFIG_REGULATOR_GPIO) += gpio-regulator.o
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obj-$(CONFIG_REGULATOR_ISL6271A) += isl6271a-regulator.o
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obj-$(CONFIG_REGULATOR_LP3971) += lp3971.o
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325
drivers/regulator/fan53555.c
Normal file
325
drivers/regulator/fan53555.c
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@ -0,0 +1,325 @@
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/*
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* FAN53555 Fairchild Digitally Programmable TinyBuck Regulator Driver.
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*
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* Supported Part Numbers:
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* FAN53555UC00X/01X/03X/04X/05X
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*
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* Copyright (c) 2012 Marvell Technology Ltd.
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* Yunfan Zhang <yfzhang@marvell.com>
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*
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* This package is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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*/
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#include <linux/module.h>
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#include <linux/param.h>
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#include <linux/err.h>
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#include <linux/platform_device.h>
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#include <linux/regulator/driver.h>
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#include <linux/regulator/machine.h>
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#include <linux/i2c.h>
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#include <linux/slab.h>
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#include <linux/regmap.h>
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#include <linux/regulator/fan53555.h>
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/* Voltage setting */
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#define FAN53555_VSEL0 0x00
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#define FAN53555_VSEL1 0x01
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/* Control register */
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#define FAN53555_CONTROL 0x02
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/* IC Type */
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#define FAN53555_ID1 0x03
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/* IC mask version */
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#define FAN53555_ID2 0x04
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/* Monitor register */
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#define FAN53555_MONITOR 0x05
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/* VSEL bit definitions */
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#define VSEL_BUCK_EN (1 << 7)
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#define VSEL_MODE (1 << 6)
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#define VSEL_NSEL_MASK 0x3F
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/* Chip ID and Verison */
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#define DIE_ID 0x0F /* ID1 */
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#define DIE_REV 0x0F /* ID2 */
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/* Control bit definitions */
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#define CTL_OUTPUT_DISCHG (1 << 7)
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#define CTL_SLEW_MASK (0x7 << 4)
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#define CTL_SLEW_SHIFT 4
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#define CTL_RESET (1 << 2)
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#define FAN53555_NVOLTAGES 64 /* Numbers of voltages */
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/* IC Type */
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enum {
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FAN53555_CHIP_ID_00 = 0,
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FAN53555_CHIP_ID_01,
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FAN53555_CHIP_ID_02,
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FAN53555_CHIP_ID_03,
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FAN53555_CHIP_ID_04,
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FAN53555_CHIP_ID_05,
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};
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struct fan53555_device_info {
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struct regmap *regmap;
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struct device *dev;
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struct regulator_desc desc;
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struct regulator_dev *rdev;
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struct regulator_init_data *regulator;
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/* IC Type and Rev */
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int chip_id;
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int chip_rev;
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/* Voltage setting register */
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unsigned int vol_reg;
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unsigned int sleep_reg;
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/* Voltage range and step(linear) */
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unsigned int vsel_min;
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unsigned int vsel_max;
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unsigned int vsel_step;
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/* Voltage slew rate limiting */
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unsigned int slew_rate;
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/* Sleep voltage cache */
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unsigned int sleep_vol_cache;
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};
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static int fan53555_set_suspend_voltage(struct regulator_dev *rdev, int uV)
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{
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struct fan53555_device_info *di = rdev_get_drvdata(rdev);
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int ret;
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if (di->sleep_vol_cache == uV)
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return 0;
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ret = regulator_map_voltage_linear(rdev, uV, uV);
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if (ret < 0)
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return -EINVAL;
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ret = regmap_update_bits(di->regmap, di->sleep_reg,
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VSEL_NSEL_MASK, ret);
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if (ret < 0)
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return -EINVAL;
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/* Cache the sleep voltage setting.
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* Might not be the real voltage which is rounded */
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di->sleep_vol_cache = uV;
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return 0;
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}
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static int fan53555_set_mode(struct regulator_dev *rdev, unsigned int mode)
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{
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struct fan53555_device_info *di = rdev_get_drvdata(rdev);
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switch (mode) {
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case REGULATOR_MODE_FAST:
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regmap_update_bits(di->regmap, di->vol_reg,
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VSEL_MODE, VSEL_MODE);
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break;
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case REGULATOR_MODE_NORMAL:
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regmap_update_bits(di->regmap, di->vol_reg, VSEL_MODE, 0);
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break;
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default:
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return -EINVAL;
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}
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return 0;
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}
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static unsigned int fan53555_get_mode(struct regulator_dev *rdev)
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{
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struct fan53555_device_info *di = rdev_get_drvdata(rdev);
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unsigned int val;
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int ret = 0;
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ret = regmap_read(di->regmap, di->vol_reg, &val);
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if (ret < 0)
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return ret;
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if (val & VSEL_MODE)
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return REGULATOR_MODE_FAST;
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else
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return REGULATOR_MODE_NORMAL;
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}
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static struct regulator_ops fan53555_regulator_ops = {
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.set_voltage_sel = regulator_set_voltage_sel_regmap,
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.get_voltage_sel = regulator_get_voltage_sel_regmap,
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.map_voltage = regulator_map_voltage_linear,
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.list_voltage = regulator_list_voltage_linear,
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.set_suspend_voltage = fan53555_set_suspend_voltage,
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.enable = regulator_enable_regmap,
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.disable = regulator_disable_regmap,
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.is_enabled = regulator_is_enabled_regmap,
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.set_mode = fan53555_set_mode,
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.get_mode = fan53555_get_mode,
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};
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/* For 00,01,03,05 options:
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* VOUT = 0.60V + NSELx * 10mV, from 0.60 to 1.23V.
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* For 04 option:
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* VOUT = 0.603V + NSELx * 12.826mV, from 0.603 to 1.411V.
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* */
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static int fan53555_device_setup(struct fan53555_device_info *di,
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struct fan53555_platform_data *pdata)
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{
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unsigned int reg, data, mask;
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/* Setup voltage control register */
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switch (pdata->sleep_vsel_id) {
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case FAN53555_VSEL_ID_0:
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di->sleep_reg = FAN53555_VSEL0;
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di->vol_reg = FAN53555_VSEL1;
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break;
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case FAN53555_VSEL_ID_1:
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di->sleep_reg = FAN53555_VSEL1;
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di->vol_reg = FAN53555_VSEL0;
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break;
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default:
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dev_err(di->dev, "Invalid VSEL ID!\n");
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return -EINVAL;
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}
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/* Init voltage range and step */
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switch (di->chip_id) {
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case FAN53555_CHIP_ID_00:
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case FAN53555_CHIP_ID_01:
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case FAN53555_CHIP_ID_03:
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case FAN53555_CHIP_ID_05:
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di->vsel_min = 600000;
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di->vsel_max = 1230000;
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di->vsel_step = 10000;
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break;
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case FAN53555_CHIP_ID_04:
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di->vsel_min = 603000;
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di->vsel_max = 1411000;
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di->vsel_step = 12826;
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break;
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default:
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dev_err(di->dev,
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"Chip ID[%d]\n not supported!\n", di->chip_id);
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return -EINVAL;
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}
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/* Init slew rate */
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if (pdata->slew_rate & 0x7)
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di->slew_rate = pdata->slew_rate;
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else
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di->slew_rate = FAN53555_SLEW_RATE_64MV;
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reg = FAN53555_CONTROL;
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data = di->slew_rate << CTL_SLEW_SHIFT;
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mask = CTL_SLEW_MASK;
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return regmap_update_bits(di->regmap, reg, mask, data);
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}
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static int fan53555_regulator_register(struct fan53555_device_info *di,
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struct regulator_config *config)
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{
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struct regulator_desc *rdesc = &di->desc;
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rdesc->name = "fan53555-reg";
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rdesc->ops = &fan53555_regulator_ops;
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rdesc->type = REGULATOR_VOLTAGE;
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rdesc->n_voltages = FAN53555_NVOLTAGES;
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rdesc->enable_reg = di->vol_reg;
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rdesc->enable_mask = VSEL_BUCK_EN;
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rdesc->min_uV = di->vsel_min;
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rdesc->uV_step = di->vsel_step;
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rdesc->vsel_reg = di->vol_reg;
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rdesc->vsel_mask = VSEL_NSEL_MASK;
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rdesc->owner = THIS_MODULE;
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di->rdev = regulator_register(&di->desc, config);
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if (IS_ERR(di->rdev))
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return PTR_ERR(di->rdev);
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return 0;
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}
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static struct regmap_config fan53555_regmap_config = {
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.reg_bits = 8,
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.val_bits = 8,
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};
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static int __devinit fan53555_regulator_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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struct fan53555_device_info *di;
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struct fan53555_platform_data *pdata;
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struct regulator_config config = { };
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unsigned int val;
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int ret;
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pdata = client->dev.platform_data;
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if (!pdata || !pdata->regulator) {
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dev_err(&client->dev, "Platform data not found!\n");
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return -ENODEV;
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}
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di = devm_kzalloc(&client->dev, sizeof(struct fan53555_device_info),
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GFP_KERNEL);
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if (!di) {
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dev_err(&client->dev, "Failed to allocate device info data!\n");
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return -ENOMEM;
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}
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di->regmap = devm_regmap_init_i2c(client, &fan53555_regmap_config);
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if (IS_ERR(di->regmap)) {
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dev_err(&client->dev, "Failed to allocate regmap!\n");
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return PTR_ERR(di->regmap);
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}
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di->dev = &client->dev;
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di->regulator = pdata->regulator;
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i2c_set_clientdata(client, di);
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/* Get chip ID */
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ret = regmap_read(di->regmap, FAN53555_ID1, &val);
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if (ret < 0) {
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dev_err(&client->dev, "Failed to get chip ID!\n");
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return -ENODEV;
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}
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di->chip_id = val & DIE_ID;
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/* Get chip revision */
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ret = regmap_read(di->regmap, FAN53555_ID2, &val);
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if (ret < 0) {
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dev_err(&client->dev, "Failed to get chip Rev!\n");
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return -ENODEV;
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}
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di->chip_rev = val & DIE_REV;
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dev_info(&client->dev, "FAN53555 Option[%d] Rev[%d] Detected!\n",
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di->chip_id, di->chip_rev);
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/* Device init */
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ret = fan53555_device_setup(di, pdata);
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if (ret < 0) {
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dev_err(&client->dev, "Failed to setup device!\n");
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return ret;
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}
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/* Register regulator */
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config.dev = di->dev;
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config.init_data = di->regulator;
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config.regmap = di->regmap;
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config.driver_data = di;
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ret = fan53555_regulator_register(di, &config);
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if (ret < 0)
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dev_err(&client->dev, "Failed to register regulator!\n");
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return ret;
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}
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static int __devexit fan53555_regulator_remove(struct i2c_client *client)
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{
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struct fan53555_device_info *di = i2c_get_clientdata(client);
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regulator_unregister(di->rdev);
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return 0;
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}
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static const struct i2c_device_id fan53555_id[] = {
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{"fan53555", -1},
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{ },
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};
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static struct i2c_driver fan53555_regulator_driver = {
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.driver = {
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.name = "fan53555-regulator",
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},
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.probe = fan53555_regulator_probe,
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.remove = __devexit_p(fan53555_regulator_remove),
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.id_table = fan53555_id,
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};
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module_i2c_driver(fan53555_regulator_driver);
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MODULE_AUTHOR("Yunfan Zhang <yfzhang@marvell.com>");
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MODULE_DESCRIPTION("FAN53555 regulator driver");
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MODULE_LICENSE("GPL v2");
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60
include/linux/regulator/fan53555.h
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60
include/linux/regulator/fan53555.h
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@ -0,0 +1,60 @@
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/*
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* fan53555.h - Fairchild Regulator FAN53555 Driver
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*
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* Copyright (C) 2012 Marvell Technology Ltd.
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* Yunfan Zhang <yfzhang@marvell.com>
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*
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* This package is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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*/
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#ifndef __FAN53555_H__
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/* VSEL ID */
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enum {
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FAN53555_VSEL_ID_0 = 0,
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FAN53555_VSEL_ID_1,
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};
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/* Transition slew rate limiting from a low to high voltage.
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* -----------------------
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* Bin |Slew Rate(mV/uS)
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* ------|----------------
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* 000 | 64.00
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* ------|----------------
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* 001 | 32.00
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* ------|----------------
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* 010 | 16.00
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* ------|----------------
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* 011 | 8.00
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* ------|----------------
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* 100 | 4.00
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* ------|----------------
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* 101 | 2.00
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* ------|----------------
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* 110 | 1.00
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* ------|----------------
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* 111 | 0.50
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* -----------------------
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*/
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enum {
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FAN53555_SLEW_RATE_64MV = 0,
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FAN53555_SLEW_RATE_32MV,
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FAN53555_SLEW_RATE_16MV,
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FAN53555_SLEW_RATE_8MV,
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FAN53555_SLEW_RATE_4MV,
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FAN53555_SLEW_RATE_2MV,
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FAN53555_SLEW_RATE_1MV,
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FAN53555_SLEW_RATE_0_5MV,
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};
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struct fan53555_platform_data {
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struct regulator_init_data *regulator;
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unsigned int slew_rate;
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/* Sleep VSEL ID */
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unsigned int sleep_vsel_id;
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};
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#endif /* __FAN53555_H__ */
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