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regulator: add MAX8907 driver

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The MAX8907 is an I2C-based power-management IC containing voltage
regulators, a reset controller, a real-time clock, and a touch-screen
controller.

The original driver was written by:
* Gyungoh Yoo <jack.yoo@maxim-ic.com>

Various fixes and enhancements by:
* Jin Park <jinyoungp@nvidia.com>
* Tom Cherry <tcherry@nvidia.com>
* Prashant Gaikwad <pgaikwad@nvidia.com>
* Dan Willemsen <dwillemsen@nvidia.com>
* Laxman Dewangan <ldewangan@nvidia.com>

During upstreaming, I (swarren):
* Converted to regmap.
* Allowed probing from device tree.
* Reworked the regulator driver to be represented as a single device that
  provides multiple regulators, rather than as a device per regulator.
* Replaced many regulator ops with standard functions.
* Added ability to specify supplies for each regulator.
* Removed the WLED regulator. If/when we expose this in the driver, it
  should be a backlight object not a regulator object.
* Renamed from max8907c->max8907, since the driver covers at least the
  C and B revisions.
* General cleanup.

Signed-off-by: Gyungoh Yoo <jack.yoo@maxim-ic.com>
Signed-off-by: Stephen Warren <swarren@nvidia.com>
Acked-by: Laxman Dewangan <ldewangan@nvidia.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
tirimbino
Gyungoh Yoo 13 years ago committed by Mark Brown
parent 0ffff5a60f
commit ffee19091a
3 changed files with 392 additions and 0 deletions
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  1. 8
      drivers/regulator/Kconfig
  2. 1
      drivers/regulator/Makefile
  3. 383
      drivers/regulator/max8907-regulator.c

8
drivers/regulator/Kconfig
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@ -172,6 +172,14 @@ config REGULATOR_MAX8660
This driver controls a Maxim 8660/8661 voltage output
regulator via I2C bus.
config REGULATOR_MAX8907
tristate "Maxim 8907 voltage regulator"
depends on MFD_MAX8907
help
This driver controls a Maxim 8907 voltage output regulator
via I2C bus. The provided regulator is suitable for Tegra
chip to control Step-Down DC-DC and LDOs.
config REGULATOR_MAX8925
tristate "Maxim MAX8925 Power Management IC"
depends on MFD_MAX8925

1
drivers/regulator/Makefile
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@ -30,6 +30,7 @@ obj-$(CONFIG_REGULATOR_LP8788) += lp8788-ldo.o
obj-$(CONFIG_REGULATOR_MAX1586) += max1586.o
obj-$(CONFIG_REGULATOR_MAX8649) += max8649.o
obj-$(CONFIG_REGULATOR_MAX8660) += max8660.o
obj-$(CONFIG_REGULATOR_MAX8907) += max8907-regulator.o
obj-$(CONFIG_REGULATOR_MAX8925) += max8925-regulator.o
obj-$(CONFIG_REGULATOR_MAX8952) += max8952.o
obj-$(CONFIG_REGULATOR_MAX8997) += max8997.o

383
drivers/regulator/max8907-regulator.c
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@ -0,0 +1,383 @@
/*
* max8907-regulator.c -- support regulators in max8907
*
* Copyright (C) 2010 Gyungoh Yoo <jack.yoo@maxim-ic.com>
* Copyright (C) 2010-2012, NVIDIA CORPORATION. All rights reserved.
*
* Portions based on drivers/regulator/tps65910-regulator.c,
* Copyright 2010 Texas Instruments Inc.
* Author: Graeme Gregory <gg@slimlogic.co.uk>
* Author: Jorge Eduardo Candelaria <jedu@slimlogic.co.uk>
*
* 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/err.h>
#include <linux/init.h>
#include <linux/mfd/core.h>
#include <linux/mfd/max8907.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/regulator/driver.h>
#include <linux/regulator/machine.h>
#include <linux/regulator/of_regulator.h>
#include <linux/regmap.h>
#include <linux/slab.h>
#define MAX8907_II2RR_VERSION_MASK 0xF0
#define MAX8907_II2RR_VERSION_REV_A 0x00
#define MAX8907_II2RR_VERSION_REV_B 0x10
#define MAX8907_II2RR_VERSION_REV_C 0x30
struct max8907_regulator {
struct regulator_desc desc[MAX8907_NUM_REGULATORS];
struct regulator_dev *rdev[MAX8907_NUM_REGULATORS];
};
#define REG_MBATT() \
[MAX8907_MBATT] = { \
.name = "MBATT", \
.supply_name = "mbatt", \
.id = MAX8907_MBATT, \
.ops = &max8907_mbatt_ops, \
.type = REGULATOR_VOLTAGE, \
.owner = THIS_MODULE, \
}
#define REG_LDO(ids, supply, base, min, max, step) \
[MAX8907_##ids] = { \
.name = #ids, \
.supply_name = supply, \
.id = MAX8907_##ids, \
.n_voltages = ((max) - (min)) / (step) + 1, \
.ops = &max8907_ldo_ops, \
.type = REGULATOR_VOLTAGE, \
.owner = THIS_MODULE, \
.min_uV = (min), \
.uV_step = (step), \
.vsel_reg = (base) + MAX8907_VOUT, \
.vsel_mask = 0x3f, \
.enable_reg = (base) + MAX8907_CTL, \
.enable_mask = MAX8907_MASK_LDO_EN, \
}
#define REG_FIXED(ids, supply, voltage) \
[MAX8907_##ids] = { \
.name = #ids, \
.supply_name = supply, \
.id = MAX8907_##ids, \
.n_voltages = 1, \
.ops = &max8907_fixed_ops, \
.type = REGULATOR_VOLTAGE, \
.owner = THIS_MODULE, \
.min_uV = (voltage), \
}
#define REG_OUT5V(ids, supply, base, voltage) \
[MAX8907_##ids] = { \
.name = #ids, \
.supply_name = supply, \
.id = MAX8907_##ids, \
.n_voltages = 1, \
.ops = &max8907_out5v_ops, \
.type = REGULATOR_VOLTAGE, \
.owner = THIS_MODULE, \
.min_uV = (voltage), \
.enable_reg = (base), \
.enable_mask = MAX8907_MASK_OUT5V_EN, \
}
#define REG_BBAT(ids, supply, base, min, max, step) \
[MAX8907_##ids] = { \
.name = #ids, \
.supply_name = supply, \
.id = MAX8907_##ids, \
.n_voltages = ((max) - (min)) / (step) + 1, \
.ops = &max8907_bbat_ops, \
.type = REGULATOR_VOLTAGE, \
.owner = THIS_MODULE, \
.min_uV = (min), \
.uV_step = (step), \
.vsel_reg = (base), \
.vsel_mask = MAX8907_MASK_VBBATTCV, \
}
#define LDO_750_50(id, supply, base) REG_LDO(id, supply, (base), \
750000, 3900000, 50000)
#define LDO_650_25(id, supply, base) REG_LDO(id, supply, (base), \
650000, 2225000, 25000)
static struct regulator_ops max8907_mbatt_ops = {
};
static struct regulator_ops max8907_ldo_ops = {
.list_voltage = regulator_list_voltage_linear,
.set_voltage_sel = regulator_set_voltage_sel_regmap,
.get_voltage_sel = regulator_get_voltage_sel_regmap,
.enable = regulator_enable_regmap,
.disable = regulator_disable_regmap,
.is_enabled = regulator_is_enabled_regmap,
};
static struct regulator_ops max8907_ldo_hwctl_ops = {
.list_voltage = regulator_list_voltage_linear,
.set_voltage_sel = regulator_set_voltage_sel_regmap,
.get_voltage_sel = regulator_get_voltage_sel_regmap,
};
static struct regulator_ops max8907_fixed_ops = {
.list_voltage = regulator_list_voltage_linear,
};
static struct regulator_ops max8907_out5v_ops = {
.list_voltage = regulator_list_voltage_linear,
.enable = regulator_enable_regmap,
.disable = regulator_disable_regmap,
.is_enabled = regulator_is_enabled_regmap,
};
static struct regulator_ops max8907_out5v_hwctl_ops = {
.list_voltage = regulator_list_voltage_linear,
};
static struct regulator_ops max8907_bbat_ops = {
.list_voltage = regulator_list_voltage_linear,
.set_voltage_sel = regulator_set_voltage_sel_regmap,
.get_voltage_sel = regulator_get_voltage_sel_regmap,
};
static struct regulator_desc max8907_regulators[] = {
REG_MBATT(),
REG_LDO(SD1, "in-v1", MAX8907_REG_SDCTL1, 650000, 2225000, 25000),
REG_LDO(SD2, "in-v2", MAX8907_REG_SDCTL2, 637500, 1425000, 12500),
REG_LDO(SD3, "in-v3", MAX8907_REG_SDCTL3, 750000, 3900000, 50000),
LDO_750_50(LDO1, "in1", MAX8907_REG_LDOCTL1),
LDO_650_25(LDO2, "in2", MAX8907_REG_LDOCTL2),
LDO_650_25(LDO3, "in3", MAX8907_REG_LDOCTL3),
LDO_750_50(LDO4, "in4", MAX8907_REG_LDOCTL4),
LDO_750_50(LDO5, "in5", MAX8907_REG_LDOCTL5),
LDO_750_50(LDO6, "in6", MAX8907_REG_LDOCTL6),
LDO_750_50(LDO7, "in7", MAX8907_REG_LDOCTL7),
LDO_750_50(LDO8, "in8", MAX8907_REG_LDOCTL8),
LDO_750_50(LDO9, "in9", MAX8907_REG_LDOCTL9),
LDO_750_50(LDO10, "in10", MAX8907_REG_LDOCTL10),
LDO_750_50(LDO11, "in11", MAX8907_REG_LDOCTL11),
LDO_750_50(LDO12, "in12", MAX8907_REG_LDOCTL12),
LDO_750_50(LDO13, "in13", MAX8907_REG_LDOCTL13),
LDO_750_50(LDO14, "in14", MAX8907_REG_LDOCTL14),
LDO_750_50(LDO15, "in15", MAX8907_REG_LDOCTL15),
LDO_750_50(LDO16, "in16", MAX8907_REG_LDOCTL16),
LDO_650_25(LDO17, "in17", MAX8907_REG_LDOCTL17),
LDO_650_25(LDO18, "in18", MAX8907_REG_LDOCTL18),
LDO_750_50(LDO19, "in19", MAX8907_REG_LDOCTL19),
LDO_750_50(LDO20, "in20", MAX8907_REG_LDOCTL20),
REG_OUT5V(OUT5V, "mbatt", MAX8907_REG_OUT5VEN, 5000000),
REG_OUT5V(OUT33V, "mbatt", MAX8907_REG_OUT33VEN, 3300000),
REG_BBAT(BBAT, "MBATT", MAX8907_REG_BBAT_CNFG,
2400000, 3000000, 200000),
REG_FIXED(SDBY, "MBATT", 1200000),
REG_FIXED(VRTC, "MBATT", 3300000),
};
#ifdef CONFIG_OF
#define MATCH(_name, _id) \
[MAX8907_##_id] = { \
.name = #_name, \
.driver_data = (void *)&max8907_regulators[MAX8907_##_id], \
}
static struct of_regulator_match max8907_matches[] = {
MATCH(mbatt, MBATT),
MATCH(sd1, SD1),
MATCH(sd2, SD2),
MATCH(sd3, SD3),
MATCH(ldo1, LDO1),
MATCH(ldo2, LDO2),
MATCH(ldo3, LDO3),
MATCH(ldo4, LDO4),
MATCH(ldo5, LDO5),
MATCH(ldo6, LDO6),
MATCH(ldo7, LDO7),
MATCH(ldo8, LDO8),
MATCH(ldo9, LDO9),
MATCH(ldo10, LDO10),
MATCH(ldo11, LDO11),
MATCH(ldo12, LDO12),
MATCH(ldo13, LDO13),
MATCH(ldo14, LDO14),
MATCH(ldo15, LDO15),
MATCH(ldo16, LDO16),
MATCH(ldo17, LDO17),
MATCH(ldo18, LDO18),
MATCH(ldo19, LDO19),
MATCH(ldo20, LDO20),
MATCH(out5v, OUT5V),
MATCH(out33v, OUT33V),
MATCH(bbat, BBAT),
MATCH(sdby, SDBY),
MATCH(vrtc, VRTC),
};
static int max8907_regulator_parse_dt(struct platform_device *pdev)
{
struct device_node *np = pdev->dev.parent->of_node;
struct device_node *regulators;
int ret;
if (!pdev->dev.parent->of_node)
return 0;
regulators = of_find_node_by_name(np, "regulators");
if (!regulators) {
dev_err(&pdev->dev, "regulators node not found\n");
return -EINVAL;
}
ret = of_regulator_match(pdev->dev.parent, regulators,
max8907_matches,
ARRAY_SIZE(max8907_matches));
if (ret < 0) {
dev_err(&pdev->dev, "Error parsing regulator init data: %d\n",
ret);
return ret;
}
return 0;
}
#else
static int max8907_regulator_parse_dt(struct platform_device *pdev)
{
return 0;
}
#endif
static __devinit int max8907_regulator_probe(struct platform_device *pdev)
{
struct max8907 *max8907 = dev_get_drvdata(pdev->dev.parent);
struct max8907_platform_data *pdata = dev_get_platdata(max8907->dev);
int ret;
struct max8907_regulator *pmic;
unsigned int val;
int i;
struct regulator_config config = {};
struct regulator_init_data *idata;
const char *mbatt_rail_name = NULL;
ret = max8907_regulator_parse_dt(pdev);
if (ret)
return ret;
pmic = devm_kzalloc(&pdev->dev, sizeof(*pmic), GFP_KERNEL);
if (!pmic) {
dev_err(&pdev->dev, "Failed to alloc pmic\n");
return -ENOMEM;
}
platform_set_drvdata(pdev, pmic);
memcpy(pmic->desc, max8907_regulators, sizeof(pmic->desc));
/* Backwards compatibility with MAX8907B; SD1 uses different voltages */
regmap_read(max8907->regmap_gen, MAX8907_REG_II2RR, &val);
if ((val & MAX8907_II2RR_VERSION_MASK) ==
MAX8907_II2RR_VERSION_REV_B) {
pmic->desc[MAX8907_SD1].min_uV = 637500;
pmic->desc[MAX8907_SD1].uV_step = 12500;
pmic->desc[MAX8907_SD1].n_voltages = (1425000 - 637500) / 12500;
}
for (i = 0; i < MAX8907_NUM_REGULATORS; i++) {
config.dev = pdev->dev.parent;
if (pdata)
idata = pdata->init_data[i];
else
idata = max8907_matches[i].init_data;
config.init_data = idata;
config.driver_data = pmic;
config.regmap = max8907->regmap_gen;
config.of_node = max8907_matches[i].of_node;
switch (pmic->desc[i].id) {
case MAX8907_MBATT:
mbatt_rail_name = idata->constraints.name;
break;
case MAX8907_BBAT:
case MAX8907_SDBY:
case MAX8907_VRTC:
idata->supply_regulator = mbatt_rail_name;
break;
}
if (pmic->desc[i].ops == &max8907_ldo_ops) {
regmap_read(config.regmap, pmic->desc[i].enable_reg,
&val);
if ((val & MAX8907_MASK_LDO_SEQ) !=
MAX8907_MASK_LDO_SEQ)
pmic->desc[i].ops = &max8907_ldo_hwctl_ops;
} else if (pmic->desc[i].ops == &max8907_out5v_ops) {
regmap_read(config.regmap, pmic->desc[i].enable_reg,
&val);
if ((val & (MAX8907_MASK_OUT5V_VINEN |
MAX8907_MASK_OUT5V_ENSRC)) !=
MAX8907_MASK_OUT5V_ENSRC)
pmic->desc[i].ops = &max8907_out5v_hwctl_ops;
}
pmic->rdev[i] = regulator_register(&pmic->desc[i], &config);
if (IS_ERR(pmic->rdev[i])) {
dev_err(&pdev->dev,
"failed to register %s regulator\n",
pmic->desc[i].name);
ret = PTR_ERR(pmic->rdev[i]);
goto err_unregister_regulator;
}
}
return 0;
err_unregister_regulator:
while (--i >= 0)
regulator_unregister(pmic->rdev[i]);
return ret;
}
static __devexit int max8907_regulator_remove(struct platform_device *pdev)
{
struct max8907_regulator *pmic;
int i;
for (i = 0; i < MAX8907_NUM_REGULATORS; i++)
regulator_unregister(pmic->rdev[i]);
return 0;
}
static struct platform_driver max8907_regulator_driver = {
.driver = {
.name = "max8907-regulator",
.owner = THIS_MODULE,
},
.probe = max8907_regulator_probe,
.remove = __devexit_p(max8907_regulator_remove),
};
static int __init max8907_regulator_init(void)
{
return platform_driver_register(&max8907_regulator_driver);
}
subsys_initcall(max8907_regulator_init);
static void __exit max8907_reg_exit(void)
{
platform_driver_unregister(&max8907_regulator_driver);
}
module_exit(max8907_reg_exit);
MODULE_DESCRIPTION("MAX8907 regulator driver");
MODULE_AUTHOR("Gyungoh Yoo <jack.yoo@maxim-ic.com>");
MODULE_LICENSE("GPL v2");
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