// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (c) 2021 Rockchip Electronics Co. Ltd.
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*
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* Author: Shunqing Chen <csq@rock-chips.com>
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*/
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#include <linux/err.h>
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#include <linux/gpio/consumer.h>
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#include <linux/i2c.h>
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/of_gpio.h>
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#include <linux/regmap.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/regulator/of_regulator.h>
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#define WL2868C_DEVICE_D1 0x00
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#define WL2868C_DEVICE_D2 0x01
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#define WL2868C_DISCHARGE_RESISTORS 0x02
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#define WL2868C_LDO1_VOUT 0x03
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#define WL2868C_LDO2_VOUT 0x04
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#define WL2868C_LDO3_VOUT 0x05
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#define WL2868C_LDO4_VOUT 0x06
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#define WL2868C_LDO5_VOUT 0x07
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#define WL2868C_LDO6_VOUT 0x08
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#define WL2868C_LDO7_VOUT 0x09
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#define WL2868C_LDO1_LDO2_SEQ 0x0a
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#define WL2868C_LDO3_LDO4_SEQ 0x0b
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#define WL2868C_LDO5_LDO6_SEQ 0x0c
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#define WL2868C_LDO7_SEQ 0x0d
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#define WL2868C_LDO_EN 0x0e
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#define WL2868C_SEQ_STATUS 0x0f
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#define WL2868C_LDO1_STATUS 0x10
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#define WL2868C_LDO1_OCP_CTL 0x11
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#define WL2868C_LDO2_STATUS 0x12
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#define WL2868C_LDO2_OCP_CTL 0x13
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#define WL2868C_LDO3_STATUS 0x14
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#define WL2868C_LDO3_OCP_CTL 0x15
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#define WL2868C_LDO4_STATUS 0x16
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#define WL2868C_LDO4_OCP_CTL 0x17
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#define WL2868C_LDO5_STATUS 0x18
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#define WL2868C_LDO5_OCP_CTL 0x19
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#define WL2868C_LDO6_STATUS 0x1a
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#define WL2868C_LDO6_OCP_CTL 0x1b
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#define WL2868C_LDO7_STATUS 0x1c
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#define WL2868C_LDO7_OCP_CTL 0x1d
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#define WL2868C_REPROGRAMMABLE_I2C_ADDR 0x1e
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#define RESERVED_1 0x1f
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#define INT_LATCHED_CLR 0x20
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#define INT_EN_SET 0x21
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#define INT_LATCHED_STS 0x22
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#define INT_PENDING_STS 0x23
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#define UVLO_CTL 0x24
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#define RESERVED_2 0x25
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#define WL2868C_VSEL_MASK 0xff
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enum wl2868c_regulators {
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WL2868C_REGULATOR_LDO1 = 0,
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WL2868C_REGULATOR_LDO2,
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WL2868C_REGULATOR_LDO3,
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WL2868C_REGULATOR_LDO4,
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WL2868C_REGULATOR_LDO5,
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WL2868C_REGULATOR_LDO6,
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WL2868C_REGULATOR_LDO7,
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WL2868C_MAX_REGULATORS,
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};
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struct wl2868c {
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struct device *dev;
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struct regmap *regmap;
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struct regulator_dev *rdev;
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struct gpio_desc *reset_gpio;
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int min_dropout_uv;
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int ldo_vout[7];
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int ldo_en;
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};
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static const struct regulator_ops wl2868c_reg_ops = {
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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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.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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};
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#define WL2868C_DESC(_id, _match, _supply, _min, _max, _step, _vreg, \
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_vmask, _ereg, _emask, _enval, _disval) \
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{ \
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.name = (_match), \
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.supply_name = (_supply), \
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.of_match = of_match_ptr(_match), \
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.regulators_node = of_match_ptr("regulators"), \
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.type = REGULATOR_VOLTAGE, \
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.id = (_id), \
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.n_voltages = (((_max) - (_min)) / (_step) + 1), \
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.owner = THIS_MODULE, \
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.min_uV = (_min) * 1000, \
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.uV_step = (_step) * 1000, \
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.vsel_reg = (_vreg), \
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.vsel_mask = (_vmask), \
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.enable_reg = (_ereg), \
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.enable_mask = (_emask), \
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.enable_val = (_enval), \
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.disable_val = (_disval), \
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.ops = &wl2868c_reg_ops, \
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}
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static const struct regulator_desc wl2868c_reg[] = {
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WL2868C_DESC(WL2868C_REGULATOR_LDO1, "WL_LDO1", "ldo1", 496, 2536, 8,
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WL2868C_LDO1_VOUT, WL2868C_VSEL_MASK, WL2868C_LDO_EN, BIT(0), BIT(0), 0),
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WL2868C_DESC(WL2868C_REGULATOR_LDO2, "WL_LDO2", "ldo2", 496, 2536, 8,
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WL2868C_LDO2_VOUT, WL2868C_VSEL_MASK, WL2868C_LDO_EN, BIT(1), BIT(1), 0),
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WL2868C_DESC(WL2868C_REGULATOR_LDO3, "WL_LDO3", "ldo3", 1504, 3544, 8,
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WL2868C_LDO3_VOUT, WL2868C_VSEL_MASK, WL2868C_LDO_EN, BIT(2), BIT(2), 0),
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WL2868C_DESC(WL2868C_REGULATOR_LDO4, "WL_LDO4", "ldo4", 1504, 3544, 8,
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WL2868C_LDO4_VOUT, WL2868C_VSEL_MASK, WL2868C_LDO_EN, BIT(3), BIT(3), 0),
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WL2868C_DESC(WL2868C_REGULATOR_LDO5, "WL_LDO5", "ldo5", 1504, 3544, 8,
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WL2868C_LDO5_VOUT, WL2868C_VSEL_MASK, WL2868C_LDO_EN, BIT(4), BIT(4), 0),
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WL2868C_DESC(WL2868C_REGULATOR_LDO6, "WL_LDO6", "ldo6", 1504, 3544, 8,
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WL2868C_LDO6_VOUT, WL2868C_VSEL_MASK, WL2868C_LDO_EN, BIT(5), BIT(5), 0),
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WL2868C_DESC(WL2868C_REGULATOR_LDO7, "WL_LDO7", "ldo7", 1504, 3544, 8,
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WL2868C_LDO7_VOUT, WL2868C_VSEL_MASK, WL2868C_LDO_EN, BIT(6), BIT(6), 0),
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};
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static const struct regmap_range wl2868c_writeable_ranges[] = {
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regmap_reg_range(WL2868C_DISCHARGE_RESISTORS, WL2868C_SEQ_STATUS),
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regmap_reg_range(WL2868C_LDO1_OCP_CTL, WL2868C_LDO1_OCP_CTL),
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regmap_reg_range(WL2868C_LDO2_OCP_CTL, WL2868C_LDO2_OCP_CTL),
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regmap_reg_range(WL2868C_LDO3_OCP_CTL, WL2868C_LDO3_OCP_CTL),
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regmap_reg_range(WL2868C_LDO4_OCP_CTL, WL2868C_LDO4_OCP_CTL),
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regmap_reg_range(WL2868C_LDO5_OCP_CTL, WL2868C_LDO5_OCP_CTL),
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regmap_reg_range(WL2868C_LDO6_OCP_CTL, WL2868C_LDO6_OCP_CTL),
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regmap_reg_range(WL2868C_LDO7_OCP_CTL, WL2868C_REPROGRAMMABLE_I2C_ADDR),
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regmap_reg_range(INT_LATCHED_CLR, INT_LATCHED_CLR),
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regmap_reg_range(INT_EN_SET, INT_EN_SET),
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regmap_reg_range(UVLO_CTL, UVLO_CTL),
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};
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static const struct regmap_range wl2868c_readable_ranges[] = {
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regmap_reg_range(WL2868C_DEVICE_D1, RESERVED_2),
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};
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static const struct regmap_range wl2868c_volatile_ranges[] = {
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regmap_reg_range(WL2868C_DISCHARGE_RESISTORS, WL2868C_SEQ_STATUS),
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regmap_reg_range(WL2868C_LDO1_OCP_CTL, WL2868C_LDO1_OCP_CTL),
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regmap_reg_range(WL2868C_LDO2_OCP_CTL, WL2868C_LDO2_OCP_CTL),
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regmap_reg_range(WL2868C_LDO3_OCP_CTL, WL2868C_LDO3_OCP_CTL),
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regmap_reg_range(WL2868C_LDO4_OCP_CTL, WL2868C_LDO4_OCP_CTL),
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regmap_reg_range(WL2868C_LDO5_OCP_CTL, WL2868C_LDO5_OCP_CTL),
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regmap_reg_range(WL2868C_LDO6_OCP_CTL, WL2868C_LDO6_OCP_CTL),
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regmap_reg_range(WL2868C_LDO7_OCP_CTL, WL2868C_REPROGRAMMABLE_I2C_ADDR),
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regmap_reg_range(INT_LATCHED_CLR, INT_LATCHED_CLR),
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regmap_reg_range(INT_EN_SET, INT_EN_SET),
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regmap_reg_range(UVLO_CTL, UVLO_CTL),
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};
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static const struct regmap_access_table wl2868c_writeable_table = {
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.yes_ranges = wl2868c_writeable_ranges,
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.n_yes_ranges = ARRAY_SIZE(wl2868c_writeable_ranges),
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};
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static const struct regmap_access_table wl2868c_readable_table = {
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.yes_ranges = wl2868c_readable_ranges,
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.n_yes_ranges = ARRAY_SIZE(wl2868c_readable_ranges),
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};
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static const struct regmap_access_table wl2868c_volatile_table = {
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.yes_ranges = wl2868c_volatile_ranges,
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.n_yes_ranges = ARRAY_SIZE(wl2868c_volatile_ranges),
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};
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static const struct regmap_config wl2868c_regmap_config = {
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.reg_bits = 8,
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.val_bits = 8,
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.max_register = RESERVED_2,
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.wr_table = &wl2868c_writeable_table,
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.rd_table = &wl2868c_readable_table,
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.cache_type = REGCACHE_RBTREE,
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.volatile_table = &wl2868c_volatile_table,
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};
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static void wl2868c_reset(struct wl2868c *wl2868c)
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{
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gpiod_set_value_cansleep(wl2868c->reset_gpio, 0);
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usleep_range(10000, 11000);
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gpiod_set_value_cansleep(wl2868c->reset_gpio, 1);
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usleep_range(10000, 11000);
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gpiod_set_value_cansleep(wl2868c->reset_gpio, 0);
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usleep_range(10000, 11000);
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}
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static int wl2868c_i2c_probe(struct i2c_client *client, const struct i2c_device_id *id)
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{
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struct device *dev = &client->dev;
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struct regulator_config config = {};
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struct regulator_dev *rdev;
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const struct regulator_desc *regulators;
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struct wl2868c *wl2868c;
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int ret, i;
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wl2868c = devm_kzalloc(dev, sizeof(struct wl2868c), GFP_KERNEL);
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if (!wl2868c)
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return -ENOMEM;
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wl2868c->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_LOW);
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if (IS_ERR(wl2868c->reset_gpio)) {
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ret = PTR_ERR(wl2868c->reset_gpio);
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dev_err(dev, "failed to request reset GPIO: %d\n", ret);
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return ret;
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}
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wl2868c_reset(wl2868c);
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i2c_set_clientdata(client, wl2868c);
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wl2868c->dev = dev;
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wl2868c->regmap = devm_regmap_init_i2c(client, &wl2868c_regmap_config);
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if (IS_ERR(wl2868c->regmap)) {
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ret = PTR_ERR(wl2868c->regmap);
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dev_err(dev, "Failed to allocate register map: %d\n", ret);
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return ret;
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}
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config.dev = &client->dev;
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config.regmap = wl2868c->regmap;
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regulators = wl2868c_reg;
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/* Instantiate the regulators */
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for (i = 0; i < WL2868C_MAX_REGULATORS; i++) {
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rdev = devm_regulator_register(&client->dev,
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®ulators[i], &config);
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if (IS_ERR(rdev)) {
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dev_err(&client->dev,
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"failed to register %d regulator\n", i);
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return PTR_ERR(rdev);
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}
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}
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return 0;
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}
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static void wl2868c_regulator_shutdown(struct i2c_client *client)
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{
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struct wl2868c *wl2868c = i2c_get_clientdata(client);
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if (system_state == SYSTEM_POWER_OFF)
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regmap_write(wl2868c->regmap, WL2868C_LDO_EN, 0x80);
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}
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static int __maybe_unused wl2868c_suspend(struct device *dev)
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{
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struct i2c_client *client = to_i2c_client(dev);
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struct wl2868c *wl2868c = i2c_get_clientdata(client);
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int i;
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regmap_read(wl2868c->regmap, WL2868C_LDO_EN, &wl2868c->ldo_en);
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for (i = 0; i < ARRAY_SIZE(wl2868c->ldo_vout); i++)
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regmap_read(wl2868c->regmap, WL2868C_LDO1_VOUT + i,
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&wl2868c->ldo_vout[i]);
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return 0;
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}
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static int __maybe_unused wl2868c_resume(struct device *dev)
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{
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struct i2c_client *client = to_i2c_client(dev);
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struct wl2868c *wl2868c = i2c_get_clientdata(client);
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int i;
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wl2868c_reset(wl2868c);
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for (i = 0; i < ARRAY_SIZE(wl2868c->ldo_vout); i++)
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regmap_write(wl2868c->regmap, WL2868C_LDO1_VOUT + i,
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wl2868c->ldo_vout[i]);
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regmap_write(wl2868c->regmap, WL2868C_LDO_EN, wl2868c->ldo_en);
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return 0;
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}
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static SIMPLE_DEV_PM_OPS(wl2868c_pm_ops, wl2868c_suspend, wl2868c_resume);
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static const struct i2c_device_id wl2868c_i2c_id[] = {
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{ "wl2868c", 0 },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, wl2868c_i2c_id);
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static const struct of_device_id wl2868c_of_match[] = {
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{ .compatible = "willsemi,wl2868c" },
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{}
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};
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MODULE_DEVICE_TABLE(of, wl2868c_of_match);
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static struct i2c_driver wl2868c_i2c_driver = {
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.driver = {
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.name = "wl2868c",
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.of_match_table = of_match_ptr(wl2868c_of_match),
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.pm = &wl2868c_pm_ops,
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},
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.id_table = wl2868c_i2c_id,
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.probe = wl2868c_i2c_probe,
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.shutdown = wl2868c_regulator_shutdown,
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};
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module_i2c_driver(wl2868c_i2c_driver);
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MODULE_DESCRIPTION("WL2868C regulator driver");
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MODULE_AUTHOR("Shunqing Chen <csq@rock-chips.com>");
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MODULE_LICENSE("GPL");
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