348 lines
9.3 KiB
C
348 lines
9.3 KiB
C
/*
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* Regulators driver for Maxim max8925
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*
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* Copyright (C) 2009 Marvell International Ltd.
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* Haojian Zhuang <haojian.zhuang@marvell.com>
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*
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* This program 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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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/err.h>
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#include <linux/i2c.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/mfd/max8925.h>
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#include <linux/of.h>
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#include <linux/regulator/of_regulator.h>
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#define SD1_DVM_VMIN 850000
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#define SD1_DVM_VMAX 1000000
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#define SD1_DVM_STEP 50000
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#define SD1_DVM_SHIFT 5 /* SDCTL1 bit5 */
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#define SD1_DVM_EN 6 /* SDV1 bit 6 */
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/* bit definitions in LDO control registers */
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#define LDO_SEQ_I2C 0x7 /* Power U/D by i2c */
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#define LDO_SEQ_MASK 0x7 /* Power U/D sequence mask */
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#define LDO_SEQ_SHIFT 2 /* Power U/D sequence offset */
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#define LDO_I2C_EN 0x1 /* Enable by i2c */
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#define LDO_I2C_EN_MASK 0x1 /* Enable mask by i2c */
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#define LDO_I2C_EN_SHIFT 0 /* Enable offset by i2c */
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struct max8925_regulator_info {
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struct regulator_desc desc;
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struct i2c_client *i2c;
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int vol_reg;
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int enable_reg;
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};
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static int max8925_set_voltage_sel(struct regulator_dev *rdev,
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unsigned int selector)
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{
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struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
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unsigned char mask = rdev->desc->n_voltages - 1;
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return max8925_set_bits(info->i2c, info->vol_reg, mask, selector);
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}
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static int max8925_get_voltage_sel(struct regulator_dev *rdev)
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{
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struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
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unsigned char data, mask;
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int ret;
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ret = max8925_reg_read(info->i2c, info->vol_reg);
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if (ret < 0)
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return ret;
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mask = rdev->desc->n_voltages - 1;
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data = ret & mask;
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return data;
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}
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static int max8925_enable(struct regulator_dev *rdev)
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{
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struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
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return max8925_set_bits(info->i2c, info->enable_reg,
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LDO_SEQ_MASK << LDO_SEQ_SHIFT |
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LDO_I2C_EN_MASK << LDO_I2C_EN_SHIFT,
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LDO_SEQ_I2C << LDO_SEQ_SHIFT |
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LDO_I2C_EN << LDO_I2C_EN_SHIFT);
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}
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static int max8925_disable(struct regulator_dev *rdev)
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{
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struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
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return max8925_set_bits(info->i2c, info->enable_reg,
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LDO_SEQ_MASK << LDO_SEQ_SHIFT |
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LDO_I2C_EN_MASK << LDO_I2C_EN_SHIFT,
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LDO_SEQ_I2C << LDO_SEQ_SHIFT);
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}
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static int max8925_is_enabled(struct regulator_dev *rdev)
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{
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struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
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int ldo_seq, ret;
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ret = max8925_reg_read(info->i2c, info->enable_reg);
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if (ret < 0)
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return ret;
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ldo_seq = (ret >> LDO_SEQ_SHIFT) & LDO_SEQ_MASK;
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if (ldo_seq != LDO_SEQ_I2C)
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return 1;
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else
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return ret & (LDO_I2C_EN_MASK << LDO_I2C_EN_SHIFT);
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}
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static int max8925_set_dvm_voltage(struct regulator_dev *rdev, int uV)
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{
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struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
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unsigned char data, mask;
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if (uV < SD1_DVM_VMIN || uV > SD1_DVM_VMAX)
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return -EINVAL;
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data = DIV_ROUND_UP(uV - SD1_DVM_VMIN, SD1_DVM_STEP);
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data <<= SD1_DVM_SHIFT;
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mask = 3 << SD1_DVM_SHIFT;
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return max8925_set_bits(info->i2c, info->enable_reg, mask, data);
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}
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static int max8925_set_dvm_enable(struct regulator_dev *rdev)
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{
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struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
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return max8925_set_bits(info->i2c, info->vol_reg, 1 << SD1_DVM_EN,
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1 << SD1_DVM_EN);
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}
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static int max8925_set_dvm_disable(struct regulator_dev *rdev)
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{
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struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
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return max8925_set_bits(info->i2c, info->vol_reg, 1 << SD1_DVM_EN, 0);
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}
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static struct regulator_ops max8925_regulator_sdv_ops = {
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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_voltage_sel = max8925_set_voltage_sel,
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.get_voltage_sel = max8925_get_voltage_sel,
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.enable = max8925_enable,
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.disable = max8925_disable,
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.is_enabled = max8925_is_enabled,
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.set_suspend_voltage = max8925_set_dvm_voltage,
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.set_suspend_enable = max8925_set_dvm_enable,
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.set_suspend_disable = max8925_set_dvm_disable,
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};
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static struct regulator_ops max8925_regulator_ldo_ops = {
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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_voltage_sel = max8925_set_voltage_sel,
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.get_voltage_sel = max8925_get_voltage_sel,
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.enable = max8925_enable,
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.disable = max8925_disable,
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.is_enabled = max8925_is_enabled,
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};
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#define MAX8925_SDV(_id, min, max, step) \
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{ \
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.desc = { \
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.name = "SDV" #_id, \
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.ops = &max8925_regulator_sdv_ops, \
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.type = REGULATOR_VOLTAGE, \
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.id = MAX8925_ID_SD##_id, \
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.owner = THIS_MODULE, \
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.n_voltages = 64, \
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.min_uV = min * 1000, \
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.uV_step = step * 1000, \
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}, \
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.vol_reg = MAX8925_SDV##_id, \
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.enable_reg = MAX8925_SDCTL##_id, \
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}
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#define MAX8925_LDO(_id, min, max, step) \
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{ \
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.desc = { \
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.name = "LDO" #_id, \
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.ops = &max8925_regulator_ldo_ops, \
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.type = REGULATOR_VOLTAGE, \
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.id = MAX8925_ID_LDO##_id, \
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.owner = THIS_MODULE, \
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.n_voltages = 64, \
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.min_uV = min * 1000, \
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.uV_step = step * 1000, \
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}, \
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.vol_reg = MAX8925_LDOVOUT##_id, \
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.enable_reg = MAX8925_LDOCTL##_id, \
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}
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#ifdef CONFIG_OF
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static struct of_regulator_match max8925_regulator_matches[] = {
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{ .name = "SDV1",},
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{ .name = "SDV2",},
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{ .name = "SDV3",},
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{ .name = "LDO1",},
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{ .name = "LDO2",},
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{ .name = "LDO3",},
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{ .name = "LDO4",},
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{ .name = "LDO5",},
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{ .name = "LDO6",},
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{ .name = "LDO7",},
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{ .name = "LDO8",},
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{ .name = "LDO9",},
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{ .name = "LDO10",},
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{ .name = "LDO11",},
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{ .name = "LDO12",},
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{ .name = "LDO13",},
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{ .name = "LDO14",},
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{ .name = "LDO15",},
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{ .name = "LDO16",},
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{ .name = "LDO17",},
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{ .name = "LDO18",},
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{ .name = "LDO19",},
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{ .name = "LDO20",},
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};
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#endif
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static struct max8925_regulator_info max8925_regulator_info[] = {
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MAX8925_SDV(1, 637.5, 1425, 12.5),
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MAX8925_SDV(2, 650, 2225, 25),
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MAX8925_SDV(3, 750, 3900, 50),
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MAX8925_LDO(1, 750, 3900, 50),
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MAX8925_LDO(2, 650, 2250, 25),
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MAX8925_LDO(3, 650, 2250, 25),
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MAX8925_LDO(4, 750, 3900, 50),
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MAX8925_LDO(5, 750, 3900, 50),
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MAX8925_LDO(6, 750, 3900, 50),
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MAX8925_LDO(7, 750, 3900, 50),
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MAX8925_LDO(8, 750, 3900, 50),
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MAX8925_LDO(9, 750, 3900, 50),
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MAX8925_LDO(10, 750, 3900, 50),
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MAX8925_LDO(11, 750, 3900, 50),
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MAX8925_LDO(12, 750, 3900, 50),
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MAX8925_LDO(13, 750, 3900, 50),
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MAX8925_LDO(14, 750, 3900, 50),
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MAX8925_LDO(15, 750, 3900, 50),
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MAX8925_LDO(16, 750, 3900, 50),
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MAX8925_LDO(17, 650, 2250, 25),
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MAX8925_LDO(18, 650, 2250, 25),
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MAX8925_LDO(19, 750, 3900, 50),
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MAX8925_LDO(20, 750, 3900, 50),
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};
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#ifdef CONFIG_OF
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static int max8925_regulator_dt_init(struct platform_device *pdev,
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struct regulator_config *config,
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int ridx)
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{
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struct device_node *nproot, *np;
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int rcount;
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nproot = pdev->dev.parent->of_node;
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if (!nproot)
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return -ENODEV;
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np = of_get_child_by_name(nproot, "regulators");
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if (!np) {
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dev_err(&pdev->dev, "failed to find regulators node\n");
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return -ENODEV;
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}
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rcount = of_regulator_match(&pdev->dev, np,
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&max8925_regulator_matches[ridx], 1);
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of_node_put(np);
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if (rcount < 0)
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return rcount;
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config->init_data = max8925_regulator_matches[ridx].init_data;
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config->of_node = max8925_regulator_matches[ridx].of_node;
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return 0;
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}
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#else
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#define max8925_regulator_dt_init(x, y, z) (-1)
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#endif
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static int max8925_regulator_probe(struct platform_device *pdev)
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{
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struct max8925_chip *chip = dev_get_drvdata(pdev->dev.parent);
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struct regulator_init_data *pdata = dev_get_platdata(&pdev->dev);
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struct regulator_config config = { };
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struct max8925_regulator_info *ri;
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struct resource *res;
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struct regulator_dev *rdev;
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int i, regulator_idx;
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res = platform_get_resource(pdev, IORESOURCE_REG, 0);
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if (!res) {
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dev_err(&pdev->dev, "No REG resource!\n");
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return -EINVAL;
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}
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for (i = 0; i < ARRAY_SIZE(max8925_regulator_info); i++) {
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ri = &max8925_regulator_info[i];
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if (ri->vol_reg == res->start) {
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regulator_idx = i;
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break;
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}
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}
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if (i == ARRAY_SIZE(max8925_regulator_info)) {
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dev_err(&pdev->dev, "Failed to find regulator %llu\n",
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(unsigned long long)res->start);
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return -EINVAL;
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}
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ri->i2c = chip->i2c;
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config.dev = &pdev->dev;
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config.driver_data = ri;
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if (max8925_regulator_dt_init(pdev, &config, regulator_idx))
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if (pdata)
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config.init_data = pdata;
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rdev = devm_regulator_register(&pdev->dev, &ri->desc, &config);
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if (IS_ERR(rdev)) {
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dev_err(&pdev->dev, "failed to register regulator %s\n",
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ri->desc.name);
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return PTR_ERR(rdev);
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}
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platform_set_drvdata(pdev, rdev);
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return 0;
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}
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static struct platform_driver max8925_regulator_driver = {
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.driver = {
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.name = "max8925-regulator",
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.owner = THIS_MODULE,
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},
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.probe = max8925_regulator_probe,
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};
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static int __init max8925_regulator_init(void)
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{
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return platform_driver_register(&max8925_regulator_driver);
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}
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subsys_initcall(max8925_regulator_init);
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static void __exit max8925_regulator_exit(void)
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{
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platform_driver_unregister(&max8925_regulator_driver);
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}
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module_exit(max8925_regulator_exit);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>");
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MODULE_DESCRIPTION("Regulator Driver for Maxim 8925 PMIC");
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MODULE_ALIAS("platform:max8925-regulator");
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