302 lines
7.9 KiB
C
302 lines
7.9 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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//
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// max77826-regulator.c - regulator driver for Maxim MAX77826
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//
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// Author: Iskren Chernev <iskren.chernev@gmail.com>
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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/of.h>
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#include <linux/of_device.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/of_regulator.h>
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#include <linux/i2c.h>
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#include <linux/regmap.h>
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enum max77826_registers {
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MAX77826_REG_INT_SRC = 0x00,
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MAX77826_REG_SYS_INT,
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MAX77826_REG_INT1,
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MAX77826_REG_INT2,
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MAX77826_REG_BB_INT,
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MAX77826_REG_INT_SRC_M,
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MAX77826_REG_TOPSYS_INT_M,
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MAX77826_REG_INT1_M,
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MAX77826_REG_INT2_M,
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MAX77826_REG_BB_INT_M,
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MAX77826_REG_TOPSYS_STAT,
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MAX77826_REG_STAT1,
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MAX77826_REG_STAT2,
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MAX77826_REG_BB_STAT,
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/* 0x0E - 0x0F: Reserved */
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MAX77826_REG_LDO_OPMD1 = 0x10,
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MAX77826_REG_LDO_OPMD2,
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MAX77826_REG_LDO_OPMD3,
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MAX77826_REG_LDO_OPMD4,
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MAX77826_REG_B_BB_OPMD,
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/* 0x15 - 0x1F: Reserved */
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MAX77826_REG_LDO1_CFG = 0x20,
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MAX77826_REG_LDO2_CFG,
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MAX77826_REG_LDO3_CFG,
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MAX77826_REG_LDO4_CFG,
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MAX77826_REG_LDO5_CFG,
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MAX77826_REG_LDO6_CFG,
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MAX77826_REG_LDO7_CFG,
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MAX77826_REG_LDO8_CFG,
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MAX77826_REG_LDO9_CFG,
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MAX77826_REG_LDO10_CFG,
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MAX77826_REG_LDO11_CFG,
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MAX77826_REG_LDO12_CFG,
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MAX77826_REG_LDO13_CFG,
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MAX77826_REG_LDO14_CFG,
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MAX77826_REG_LDO15_CFG,
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/* 0x2F: Reserved */
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MAX77826_REG_BUCK_CFG = 0x30,
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MAX77826_REG_BUCK_VOUT,
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MAX77826_REG_BB_CFG,
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MAX77826_REG_BB_VOUT,
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/* 0x34 - 0x3F: Reserved */
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MAX77826_REG_BUCK_SS_FREQ = 0x40,
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MAX77826_REG_UVLO_FALL,
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/* 0x42 - 0xCE: Reserved */
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MAX77826_REG_DEVICE_ID = 0xCF,
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};
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enum max77826_regulators {
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MAX77826_LDO1 = 0,
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MAX77826_LDO2,
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MAX77826_LDO3,
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MAX77826_LDO4,
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MAX77826_LDO5,
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MAX77826_LDO6,
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MAX77826_LDO7,
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MAX77826_LDO8,
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MAX77826_LDO9,
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MAX77826_LDO10,
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MAX77826_LDO11,
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MAX77826_LDO12,
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MAX77826_LDO13,
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MAX77826_LDO14,
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MAX77826_LDO15,
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MAX77826_BUCK,
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MAX77826_BUCKBOOST,
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MAX77826_MAX_REGULATORS,
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};
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#define MAX77826_MASK_LDO 0x7f
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#define MAX77826_MASK_BUCK 0xff
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#define MAX77826_MASK_BUCKBOOST 0x7f
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#define MAX77826_BUCK_RAMP_DELAY 12500
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/* values in mV */
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/* for LDO1-3 */
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#define MAX77826_NMOS_LDO_VOLT_MIN 600000
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#define MAX77826_NMOS_LDO_VOLT_MAX 2187500
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#define MAX77826_NMOS_LDO_VOLT_STEP 12500
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/* for LDO4-15 */
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#define MAX77826_PMOS_LDO_VOLT_MIN 800000
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#define MAX77826_PMOS_LDO_VOLT_MAX 3975000
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#define MAX77826_PMOS_LDO_VOLT_STEP 25000
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/* for BUCK */
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#define MAX77826_BUCK_VOLT_MIN 500000
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#define MAX77826_BUCK_VOLT_MAX 1800000
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#define MAX77826_BUCK_VOLT_STEP 6250
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/* for BUCKBOOST */
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#define MAX77826_BUCKBOOST_VOLT_MIN 2600000
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#define MAX77826_BUCKBOOST_VOLT_MAX 4187500
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#define MAX77826_BUCKBOOST_VOLT_STEP 12500
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#define MAX77826_VOLT_RANGE(_type) \
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((MAX77826_ ## _type ## _VOLT_MAX - \
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MAX77826_ ## _type ## _VOLT_MIN) / \
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MAX77826_ ## _type ## _VOLT_STEP + 1)
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#define MAX77826_LDO(_id, _type) \
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[MAX77826_LDO ## _id] = { \
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.id = MAX77826_LDO ## _id, \
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.name = "LDO"#_id, \
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.of_match = of_match_ptr("LDO"#_id), \
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.regulators_node = "regulators", \
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.ops = &max77826_most_ops, \
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.min_uV = MAX77826_ ## _type ## _LDO_VOLT_MIN, \
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.uV_step = MAX77826_ ## _type ## _LDO_VOLT_STEP, \
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.n_voltages = MAX77826_VOLT_RANGE(_type ## _LDO), \
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.enable_reg = MAX77826_REG_LDO_OPMD1 + (_id - 1) / 4, \
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.enable_mask = BIT(((_id - 1) % 4) * 2 + 1), \
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.vsel_reg = MAX77826_REG_LDO1_CFG + (_id - 1), \
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.vsel_mask = MAX77826_MASK_LDO, \
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.owner = THIS_MODULE, \
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}
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#define MAX77826_BUCK(_idx, _id, _ops) \
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[MAX77826_ ## _id] = { \
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.id = MAX77826_ ## _id, \
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.name = #_id, \
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.of_match = of_match_ptr(#_id), \
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.regulators_node = "regulators", \
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.ops = &_ops, \
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.min_uV = MAX77826_ ## _id ## _VOLT_MIN, \
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.uV_step = MAX77826_ ## _id ## _VOLT_STEP, \
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.n_voltages = MAX77826_VOLT_RANGE(_id), \
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.enable_reg = MAX77826_REG_B_BB_OPMD, \
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.enable_mask = BIT(_idx * 2 + 1), \
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.vsel_reg = MAX77826_REG_BUCK_VOUT + _idx * 2, \
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.vsel_mask = MAX77826_MASK_ ## _id, \
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.owner = THIS_MODULE, \
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}
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struct max77826_regulator_info {
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struct regmap *regmap;
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struct regulator_desc *rdesc;
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};
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static const struct regmap_config max77826_regmap_config = {
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.reg_bits = 8,
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.val_bits = 8,
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.max_register = MAX77826_REG_DEVICE_ID,
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};
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static int max77826_set_voltage_time_sel(struct regulator_dev *,
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unsigned int old_selector,
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unsigned int new_selector);
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static const struct regulator_ops max77826_most_ops = {
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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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.list_voltage = regulator_list_voltage_linear,
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.map_voltage = regulator_map_voltage_linear,
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.get_voltage_sel = regulator_get_voltage_sel_regmap,
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.set_voltage_sel = regulator_set_voltage_sel_regmap,
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};
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static const struct regulator_ops max77826_buck_ops = {
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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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.list_voltage = regulator_list_voltage_linear,
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.map_voltage = regulator_map_voltage_linear,
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.get_voltage_sel = regulator_get_voltage_sel_regmap,
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.set_voltage_sel = regulator_set_voltage_sel_regmap,
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.set_voltage_time_sel = max77826_set_voltage_time_sel,
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};
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static struct regulator_desc max77826_regulators_desc[] = {
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MAX77826_LDO(1, NMOS),
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MAX77826_LDO(2, NMOS),
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MAX77826_LDO(3, NMOS),
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MAX77826_LDO(4, PMOS),
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MAX77826_LDO(5, PMOS),
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MAX77826_LDO(6, PMOS),
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MAX77826_LDO(7, PMOS),
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MAX77826_LDO(8, PMOS),
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MAX77826_LDO(9, PMOS),
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MAX77826_LDO(10, PMOS),
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MAX77826_LDO(11, PMOS),
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MAX77826_LDO(12, PMOS),
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MAX77826_LDO(13, PMOS),
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MAX77826_LDO(14, PMOS),
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MAX77826_LDO(15, PMOS),
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MAX77826_BUCK(0, BUCK, max77826_buck_ops),
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MAX77826_BUCK(1, BUCKBOOST, max77826_most_ops),
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};
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static int max77826_set_voltage_time_sel(struct regulator_dev *rdev,
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unsigned int old_selector,
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unsigned int new_selector)
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{
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if (new_selector > old_selector) {
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return DIV_ROUND_UP(MAX77826_BUCK_VOLT_STEP *
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(new_selector - old_selector),
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MAX77826_BUCK_RAMP_DELAY);
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}
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return 0;
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}
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static int max77826_read_device_id(struct regmap *regmap, struct device *dev)
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{
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unsigned int device_id;
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int res;
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res = regmap_read(regmap, MAX77826_REG_DEVICE_ID, &device_id);
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if (!res)
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dev_dbg(dev, "DEVICE_ID: 0x%x\n", device_id);
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return res;
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}
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static int max77826_i2c_probe(struct i2c_client *client)
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{
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struct device *dev = &client->dev;
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struct max77826_regulator_info *info;
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struct regulator_config config = {};
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struct regulator_dev *rdev;
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struct regmap *regmap;
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int i;
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info = devm_kzalloc(dev, sizeof(struct max77826_regulator_info),
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GFP_KERNEL);
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if (!info)
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return -ENOMEM;
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info->rdesc = max77826_regulators_desc;
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regmap = devm_regmap_init_i2c(client, &max77826_regmap_config);
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if (IS_ERR(regmap)) {
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dev_err(dev, "Failed to allocate regmap!\n");
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return PTR_ERR(regmap);
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}
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info->regmap = regmap;
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i2c_set_clientdata(client, info);
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config.dev = dev;
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config.regmap = regmap;
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config.driver_data = info;
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for (i = 0; i < MAX77826_MAX_REGULATORS; i++) {
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rdev = devm_regulator_register(dev,
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&max77826_regulators_desc[i],
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&config);
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if (IS_ERR(rdev)) {
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dev_err(dev, "Failed to register regulator!\n");
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return PTR_ERR(rdev);
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}
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}
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return max77826_read_device_id(regmap, dev);
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}
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static const struct of_device_id __maybe_unused max77826_of_match[] = {
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{ .compatible = "maxim,max77826" },
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{ /* sentinel */ }
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};
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MODULE_DEVICE_TABLE(of, max77826_of_match);
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static const struct i2c_device_id max77826_id[] = {
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{ "max77826-regulator" },
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{ /* sentinel */ }
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};
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MODULE_DEVICE_TABLE(i2c, max77826_id);
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static struct i2c_driver max77826_regulator_driver = {
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.driver = {
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.name = "max77826",
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.of_match_table = of_match_ptr(max77826_of_match),
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},
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.probe_new = max77826_i2c_probe,
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.id_table = max77826_id,
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};
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module_i2c_driver(max77826_regulator_driver);
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MODULE_AUTHOR("Iskren Chernev <iskren.chernev@gmail.com>");
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MODULE_DESCRIPTION("MAX77826 PMIC regulator driver");
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MODULE_LICENSE("GPL");
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