From e04f28a0bc5f9bf6cc735a38c56b4b849f52b5ea Mon Sep 17 00:00:00 2001 From: Haojian Zhuang Date: Fri, 18 Dec 2009 10:02:16 -0500 Subject: [PATCH] regulator: add max8925 support MAX8925 contains 3 Buck and 20 LDO regulator. Signed-off-by: Haojian Zhuang --- drivers/regulator/Kconfig | 6 + drivers/regulator/Makefile | 1 + drivers/regulator/max8925.c | 346 +++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 353 insertions(+), 0 deletions(-) create mode 100644 drivers/regulator/max8925.c diff --git a/drivers/regulator/Kconfig b/drivers/regulator/Kconfig index bcbb161..72b334c 100644 --- a/drivers/regulator/Kconfig +++ b/drivers/regulator/Kconfig @@ -69,6 +69,12 @@ config REGULATOR_MAX1586 regulator via I2C bus. The provided regulator is suitable for PXA27x chips to control VCC_CORE and VCC_USIM voltages. +config REGULATOR_MAX8925 + tristate "Maxim MAX8925 Power Management IC" + depends on MFD_MAX8925 + help + Say y here to support the voltage regulaltor of Maxim MAX8925 PMIC. + config REGULATOR_TWL4030 bool "TI TWL4030/TWL5030/TPS695x0 PMIC" depends on TWL4030_CORE diff --git a/drivers/regulator/Makefile b/drivers/regulator/Makefile index 4257a86..2c20507 100644 --- a/drivers/regulator/Makefile +++ b/drivers/regulator/Makefile @@ -11,6 +11,7 @@ obj-$(CONFIG_REGULATOR_USERSPACE_CONSUMER) += userspace-consumer.o obj-$(CONFIG_REGULATOR_BQ24022) += bq24022.o obj-$(CONFIG_REGULATOR_LP3971) += lp3971.o obj-$(CONFIG_REGULATOR_MAX1586) += max1586.o +obj-$(CONFIG_REGULATOR_MAX8925) += max8925.o obj-$(CONFIG_REGULATOR_TWL4030) += twl4030-regulator.o obj-$(CONFIG_REGULATOR_WM831X) += wm831x-dcdc.o obj-$(CONFIG_REGULATOR_WM831X) += wm831x-isink.o diff --git a/drivers/regulator/max8925.c b/drivers/regulator/max8925.c new file mode 100644 index 0000000..a4c48f6 --- /dev/null +++ b/drivers/regulator/max8925.c @@ -0,0 +1,346 @@ +/* + * Regulators driver for Maxim max8925 + * + * Copyright (C) 2009 Marvell International Ltd. + * Haojian Zhuang + * + * 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 +#include +#include +#include +#include +#include +#include +#include + +#define SD1_DVM_VMIN 850000 +#define SD1_DVM_VMAX 1000000 +#define SD1_DVM_STEP 50000 +#define SD1_DVM_SHIFT 5 /* SDCTL1 bit5 */ +#define SD1_DVM_EN 6 /* SDV1 bit 6 */ + +struct max8925_regulator_info { + struct regulator_desc desc; + struct regulator_dev *regulator; + struct i2c_client *i2c; + struct max8925_chip *chip; + + int min_uV; + int max_uV; + int step_uV; + int vol_reg; + int vol_shift; + int vol_nbits; + int enable_bit; + int enable_reg; +}; + +static inline int check_range(struct max8925_regulator_info *info, + int min_uV, int max_uV) +{ + if (min_uV < info->min_uV || min_uV > info->max_uV) + return -EINVAL; + + return 0; +} + +static int max8925_list_voltage(struct regulator_dev *rdev, unsigned index) +{ + struct max8925_regulator_info *info = rdev_get_drvdata(rdev); + return info->min_uV + index * info->step_uV; +} + +static int max8925_set_voltage(struct regulator_dev *rdev, + int min_uV, int max_uV) +{ + struct max8925_regulator_info *info = rdev_get_drvdata(rdev); + unsigned char data, mask; + + if (check_range(info, min_uV, max_uV)) { + dev_err(info->chip->dev, "invalid voltage range (%d, %d) uV\n", + min_uV, max_uV); + return -EINVAL; + } + data = (min_uV - info->min_uV + info->step_uV - 1) / info->step_uV; + data <<= info->vol_shift; + mask = ((1 << info->vol_nbits) - 1) << info->vol_shift; + + return max8925_set_bits(info->i2c, info->vol_reg, mask, data); +} + +static int max8925_get_voltage(struct regulator_dev *rdev) +{ + struct max8925_regulator_info *info = rdev_get_drvdata(rdev); + unsigned char data, mask; + int ret; + + ret = max8925_reg_read(info->i2c, info->vol_reg); + if (ret < 0) + return ret; + mask = ((1 << info->vol_nbits) - 1) << info->vol_shift; + data = (ret & mask) >> info->vol_shift; + + return max8925_list_voltage(rdev, data); +} + +static int max8925_enable(struct regulator_dev *rdev) +{ + struct max8925_regulator_info *info = rdev_get_drvdata(rdev); + + return max8925_set_bits(info->i2c, info->enable_reg, + 1 << info->enable_bit, + 1 << info->enable_bit); +} + +static int max8925_disable(struct regulator_dev *rdev) +{ + struct max8925_regulator_info *info = rdev_get_drvdata(rdev); + + return max8925_set_bits(info->i2c, info->enable_reg, + 1 << info->enable_bit, 0); +} + +static int max8925_is_enabled(struct regulator_dev *rdev) +{ + struct max8925_regulator_info *info = rdev_get_drvdata(rdev); + int ret; + + ret = max8925_reg_read(info->i2c, info->vol_reg); + if (ret < 0) + return ret; + + return ret & (1 << info->enable_bit); +} + +static int max8925_set_dvm_voltage(struct regulator_dev *rdev, int uV) +{ + struct max8925_regulator_info *info = rdev_get_drvdata(rdev); + unsigned char data, mask; + + if (uV < SD1_DVM_VMIN || uV > SD1_DVM_VMAX) + return -EINVAL; + + data = (uV - SD1_DVM_VMIN + SD1_DVM_STEP - 1) / SD1_DVM_STEP; + data <<= SD1_DVM_SHIFT; + mask = 3 << SD1_DVM_SHIFT; + + return max8925_set_bits(info->i2c, info->enable_reg, mask, data); +} + +static int max8925_set_dvm_enable(struct regulator_dev *rdev) +{ + struct max8925_regulator_info *info = rdev_get_drvdata(rdev); + + return max8925_set_bits(info->i2c, info->vol_reg, 1 << SD1_DVM_EN, + 1 << SD1_DVM_EN); +} + +static int max8925_set_dvm_disable(struct regulator_dev *rdev) +{ + struct max8925_regulator_info *info = rdev_get_drvdata(rdev); + + return max8925_set_bits(info->i2c, info->vol_reg, 1 << SD1_DVM_EN, 0); +} + +static struct regulator_ops max8925_regulator_sdv_ops = { + .set_voltage = max8925_set_voltage, + .get_voltage = max8925_get_voltage, + .enable = max8925_enable, + .disable = max8925_disable, + .is_enabled = max8925_is_enabled, + .set_suspend_voltage = max8925_set_dvm_voltage, + .set_suspend_enable = max8925_set_dvm_enable, + .set_suspend_disable = max8925_set_dvm_disable, +}; + +static struct regulator_ops max8925_regulator_ldo_ops = { + .set_voltage = max8925_set_voltage, + .get_voltage = max8925_get_voltage, + .enable = max8925_enable, + .disable = max8925_disable, + .is_enabled = max8925_is_enabled, +}; + +#define MAX8925_SDV(_id, min, max, step) \ +{ \ + .desc = { \ + .name = "SDV" #_id, \ + .ops = &max8925_regulator_sdv_ops, \ + .type = REGULATOR_VOLTAGE, \ + .id = MAX8925_ID_SD##_id, \ + .owner = THIS_MODULE, \ + }, \ + .min_uV = min * 1000, \ + .max_uV = max * 1000, \ + .step_uV = step * 1000, \ + .vol_reg = MAX8925_SDV##_id, \ + .vol_shift = 0, \ + .vol_nbits = 6, \ + .enable_reg = MAX8925_SDCTL##_id, \ + .enable_bit = 0, \ +} + +#define MAX8925_LDO(_id, min, max, step) \ +{ \ + .desc = { \ + .name = "LDO" #_id, \ + .ops = &max8925_regulator_ldo_ops, \ + .type = REGULATOR_VOLTAGE, \ + .id = MAX8925_ID_LDO##_id, \ + .owner = THIS_MODULE, \ + }, \ + .min_uV = min * 1000, \ + .max_uV = max * 1000, \ + .step_uV = step * 1000, \ + .vol_reg = MAX8925_LDOVOUT##_id, \ + .vol_shift = 0, \ + .vol_nbits = 6, \ + .enable_reg = MAX8925_LDOCTL##_id, \ + .enable_bit = 0, \ +} + +static struct max8925_regulator_info max8925_regulator_info[] = { + MAX8925_SDV(1, 637.5, 1425, 12.5), + MAX8925_SDV(2, 650, 2225, 25), + MAX8925_SDV(3, 750, 3900, 50), + + MAX8925_LDO(1, 750, 3900, 50), + MAX8925_LDO(2, 650, 2250, 25), + MAX8925_LDO(3, 650, 2250, 25), + MAX8925_LDO(4, 750, 3900, 50), + MAX8925_LDO(5, 750, 3900, 50), + MAX8925_LDO(6, 750, 3900, 50), + MAX8925_LDO(7, 750, 3900, 50), + MAX8925_LDO(8, 750, 3900, 50), + MAX8925_LDO(9, 750, 3900, 50), + MAX8925_LDO(10, 750, 3900, 50), + MAX8925_LDO(11, 750, 3900, 50), + MAX8925_LDO(12, 750, 3900, 50), + MAX8925_LDO(13, 750, 3900, 50), + MAX8925_LDO(14, 750, 3900, 50), + MAX8925_LDO(15, 750, 3900, 50), + MAX8925_LDO(16, 750, 3900, 50), + MAX8925_LDO(17, 650, 2250, 25), + MAX8925_LDO(18, 650, 2250, 25), + MAX8925_LDO(19, 750, 3900, 50), + MAX8925_LDO(20, 750, 3900, 50), +}; + +static inline struct max8925_regulator_info *find_regulator_info(int id) +{ + struct max8925_regulator_info *ri; + int i; + + for (i = 0; i < ARRAY_SIZE(max8925_regulator_info); i++) { + ri = &max8925_regulator_info[i]; + if (ri->desc.id == id) + return ri; + } + return NULL; +} + +static int __devinit max8925_regulator_probe(struct platform_device *pdev) +{ + struct max8925_chip *chip = dev_get_drvdata(pdev->dev.parent); + struct max8925_platform_data *pdata = chip->dev->platform_data; + struct max8925_regulator_info *ri = NULL; + struct regulator_dev *rdev; + + ri = find_regulator_info(pdev->id); + if (ri == NULL) { + dev_err(&pdev->dev, "invalid regulator ID specified\n"); + return -EINVAL; + } + ri->i2c = chip->i2c; + ri->chip = chip; + + rdev = regulator_register(&ri->desc, &pdev->dev, + pdata->regulator[pdev->id], ri); + if (IS_ERR(rdev)) { + dev_err(&pdev->dev, "failed to register regulator %s\n", + ri->desc.name); + return PTR_ERR(rdev); + } + + platform_set_drvdata(pdev, rdev); + return 0; +} + +static int __devexit max8925_regulator_remove(struct platform_device *pdev) +{ + struct regulator_dev *rdev = platform_get_drvdata(pdev); + + regulator_unregister(rdev); + return 0; +} + +#define MAX8925_REGULATOR_DRIVER(_name) \ +{ \ + .driver = { \ + .name = "max8925-" #_name, \ + .owner = THIS_MODULE, \ + }, \ + .probe = max8925_regulator_probe, \ + .remove = __devexit_p(max8925_regulator_remove),\ +} + +static struct platform_driver max8925_regulator_driver[] = { + MAX8925_REGULATOR_DRIVER(sd1), + MAX8925_REGULATOR_DRIVER(sd2), + MAX8925_REGULATOR_DRIVER(sd3), + MAX8925_REGULATOR_DRIVER(ldo1), + MAX8925_REGULATOR_DRIVER(ldo2), + MAX8925_REGULATOR_DRIVER(ldo3), + MAX8925_REGULATOR_DRIVER(ldo4), + MAX8925_REGULATOR_DRIVER(ldo5), + MAX8925_REGULATOR_DRIVER(ldo6), + MAX8925_REGULATOR_DRIVER(ldo7), + MAX8925_REGULATOR_DRIVER(ldo8), + MAX8925_REGULATOR_DRIVER(ldo9), + MAX8925_REGULATOR_DRIVER(ldo10), + MAX8925_REGULATOR_DRIVER(ldo11), + MAX8925_REGULATOR_DRIVER(ldo12), + MAX8925_REGULATOR_DRIVER(ldo13), + MAX8925_REGULATOR_DRIVER(ldo14), + MAX8925_REGULATOR_DRIVER(ldo15), + MAX8925_REGULATOR_DRIVER(ldo16), + MAX8925_REGULATOR_DRIVER(ldo17), + MAX8925_REGULATOR_DRIVER(ldo18), + MAX8925_REGULATOR_DRIVER(ldo19), + MAX8925_REGULATOR_DRIVER(ldo20), +}; + +static int __init max8925_regulator_init(void) +{ + int i, count, ret; + + count = ARRAY_SIZE(max8925_regulator_driver); + for (i = 0; i < count; i++) { + ret = platform_driver_register(&max8925_regulator_driver[i]); + if (ret != 0) + pr_err("Failed to register regulator driver: %d\n", + ret); + } + return 0; +} +module_init(max8925_regulator_init); + +static void __exit max8925_regulator_exit(void) +{ + int i, count; + + count = ARRAY_SIZE(max8925_regulator_driver); + for (i = 0; i < count; i++) + platform_driver_unregister(&max8925_regulator_driver[i]); +} +module_exit(max8925_regulator_exit); + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Haojian Zhuang "); +MODULE_DESCRIPTION("Regulator Driver for Maxim 8925 PMIC"); +MODULE_ALIAS("platform:max8925-regulator"); + -- 1.5.6.5