499 lines
15 KiB
C
499 lines
15 KiB
C
// SPDX-License-Identifier: GPL-2.0
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//
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// Copyright (C) 2018 BayLibre SAS
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// Author: Bartosz Golaszewski <bgolaszewski@baylibre.com>
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//
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// Regulator driver for MAXIM 77650/77651 charger/power-supply.
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#include <linux/of.h>
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#include <linux/mfd/max77650.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/regmap.h>
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#include <linux/regulator/driver.h>
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#define MAX77650_REGULATOR_EN_CTRL_MASK GENMASK(3, 0)
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#define MAX77650_REGULATOR_EN_CTRL_BITS(_reg) \
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((_reg) & MAX77650_REGULATOR_EN_CTRL_MASK)
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#define MAX77650_REGULATOR_ENABLED GENMASK(2, 1)
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#define MAX77650_REGULATOR_DISABLED BIT(2)
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#define MAX77650_REGULATOR_V_LDO_MASK GENMASK(6, 0)
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#define MAX77650_REGULATOR_V_SBB_MASK GENMASK(5, 0)
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#define MAX77650_REGULATOR_AD_MASK BIT(3)
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#define MAX77650_REGULATOR_AD_DISABLED 0x00
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#define MAX77650_REGULATOR_AD_ENABLED BIT(3)
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#define MAX77650_REGULATOR_CURR_LIM_MASK GENMASK(7, 6)
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enum {
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MAX77650_REGULATOR_ID_LDO = 0,
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MAX77650_REGULATOR_ID_SBB0,
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MAX77650_REGULATOR_ID_SBB1,
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MAX77650_REGULATOR_ID_SBB2,
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MAX77650_REGULATOR_NUM_REGULATORS,
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};
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struct max77650_regulator_desc {
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struct regulator_desc desc;
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unsigned int regA;
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unsigned int regB;
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};
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static const u32 max77651_sbb1_regulator_volt_table[] = {
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2400000, 3200000, 4000000, 4800000,
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2450000, 3250000, 4050000, 4850000,
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2500000, 3300000, 4100000, 4900000,
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2550000, 3350000, 4150000, 4950000,
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2600000, 3400000, 4200000, 5000000,
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2650000, 3450000, 4250000, 5050000,
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2700000, 3500000, 4300000, 5100000,
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2750000, 3550000, 4350000, 5150000,
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2800000, 3600000, 4400000, 5200000,
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2850000, 3650000, 4450000, 5250000,
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2900000, 3700000, 4500000, 0,
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2950000, 3750000, 4550000, 0,
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3000000, 3800000, 4600000, 0,
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3050000, 3850000, 4650000, 0,
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3100000, 3900000, 4700000, 0,
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3150000, 3950000, 4750000, 0,
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};
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#define MAX77651_REGULATOR_SBB1_SEL_DEC(_val) \
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(((_val & 0x3c) >> 2) | ((_val & 0x03) << 4))
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#define MAX77651_REGULATOR_SBB1_SEL_ENC(_val) \
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(((_val & 0x30) >> 4) | ((_val & 0x0f) << 2))
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#define MAX77650_REGULATOR_SBB1_SEL_DECR(_val) \
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do { \
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_val = MAX77651_REGULATOR_SBB1_SEL_DEC(_val); \
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_val--; \
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_val = MAX77651_REGULATOR_SBB1_SEL_ENC(_val); \
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} while (0)
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#define MAX77650_REGULATOR_SBB1_SEL_INCR(_val) \
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do { \
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_val = MAX77651_REGULATOR_SBB1_SEL_DEC(_val); \
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_val++; \
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_val = MAX77651_REGULATOR_SBB1_SEL_ENC(_val); \
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} while (0)
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static const unsigned int max77650_current_limit_table[] = {
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1000000, 866000, 707000, 500000,
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};
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static int max77650_regulator_is_enabled(struct regulator_dev *rdev)
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{
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struct max77650_regulator_desc *rdesc;
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struct regmap *map;
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int val, rv, en;
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rdesc = rdev_get_drvdata(rdev);
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map = rdev_get_regmap(rdev);
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rv = regmap_read(map, rdesc->regB, &val);
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if (rv)
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return rv;
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en = MAX77650_REGULATOR_EN_CTRL_BITS(val);
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return en != MAX77650_REGULATOR_DISABLED;
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}
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static int max77650_regulator_enable(struct regulator_dev *rdev)
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{
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struct max77650_regulator_desc *rdesc;
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struct regmap *map;
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rdesc = rdev_get_drvdata(rdev);
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map = rdev_get_regmap(rdev);
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return regmap_update_bits(map, rdesc->regB,
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MAX77650_REGULATOR_EN_CTRL_MASK,
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MAX77650_REGULATOR_ENABLED);
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}
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static int max77650_regulator_disable(struct regulator_dev *rdev)
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{
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struct max77650_regulator_desc *rdesc;
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struct regmap *map;
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rdesc = rdev_get_drvdata(rdev);
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map = rdev_get_regmap(rdev);
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return regmap_update_bits(map, rdesc->regB,
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MAX77650_REGULATOR_EN_CTRL_MASK,
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MAX77650_REGULATOR_DISABLED);
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}
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static int max77650_regulator_set_voltage_sel(struct regulator_dev *rdev,
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unsigned int sel)
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{
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int rv = 0, curr, diff;
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bool ascending;
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/*
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* If the regulator is disabled, we can program the desired
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* voltage right away.
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*/
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if (!max77650_regulator_is_enabled(rdev))
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return regulator_set_voltage_sel_regmap(rdev, sel);
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/*
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* Otherwise we need to manually ramp the output voltage up/down
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* one step at a time.
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*/
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curr = regulator_get_voltage_sel_regmap(rdev);
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if (curr < 0)
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return curr;
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diff = curr - sel;
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if (diff == 0)
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return 0; /* Already there. */
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else if (diff > 0)
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ascending = false;
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else
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ascending = true;
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/*
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* Make sure we'll get to the right voltage and break the loop even if
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* the selector equals 0.
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*/
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for (ascending ? curr++ : curr--;; ascending ? curr++ : curr--) {
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rv = regulator_set_voltage_sel_regmap(rdev, curr);
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if (rv)
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return rv;
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if (curr == sel)
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break;
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}
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return 0;
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}
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/*
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* Special case: non-linear voltage table for max77651 SBB1 - software
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* must ensure the voltage is ramped in 50mV increments.
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*/
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static int max77651_regulator_sbb1_set_voltage_sel(struct regulator_dev *rdev,
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unsigned int sel)
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{
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int rv = 0, curr, vcurr, vdest, vdiff;
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/*
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* If the regulator is disabled, we can program the desired
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* voltage right away.
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*/
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if (!max77650_regulator_is_enabled(rdev))
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return regulator_set_voltage_sel_regmap(rdev, sel);
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curr = regulator_get_voltage_sel_regmap(rdev);
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if (curr < 0)
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return curr;
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if (curr == sel)
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return 0; /* Already there. */
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vcurr = max77651_sbb1_regulator_volt_table[curr];
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vdest = max77651_sbb1_regulator_volt_table[sel];
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vdiff = vcurr - vdest;
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for (;;) {
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if (vdiff > 0)
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MAX77650_REGULATOR_SBB1_SEL_DECR(curr);
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else
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MAX77650_REGULATOR_SBB1_SEL_INCR(curr);
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rv = regulator_set_voltage_sel_regmap(rdev, curr);
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if (rv)
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return rv;
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if (curr == sel)
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break;
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};
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return 0;
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}
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static const struct regulator_ops max77650_regulator_LDO_ops = {
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.is_enabled = max77650_regulator_is_enabled,
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.enable = max77650_regulator_enable,
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.disable = max77650_regulator_disable,
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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 = max77650_regulator_set_voltage_sel,
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.set_active_discharge = regulator_set_active_discharge_regmap,
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};
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static const struct regulator_ops max77650_regulator_SBB_ops = {
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.is_enabled = max77650_regulator_is_enabled,
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.enable = max77650_regulator_enable,
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.disable = max77650_regulator_disable,
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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 = max77650_regulator_set_voltage_sel,
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.get_current_limit = regulator_get_current_limit_regmap,
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.set_current_limit = regulator_set_current_limit_regmap,
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.set_active_discharge = regulator_set_active_discharge_regmap,
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};
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/* Special case for max77651 SBB1 - non-linear voltage mapping. */
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static const struct regulator_ops max77651_SBB1_regulator_ops = {
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.is_enabled = max77650_regulator_is_enabled,
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.enable = max77650_regulator_enable,
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.disable = max77650_regulator_disable,
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.list_voltage = regulator_list_voltage_table,
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.get_voltage_sel = regulator_get_voltage_sel_regmap,
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.set_voltage_sel = max77651_regulator_sbb1_set_voltage_sel,
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.get_current_limit = regulator_get_current_limit_regmap,
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.set_current_limit = regulator_set_current_limit_regmap,
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.set_active_discharge = regulator_set_active_discharge_regmap,
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};
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static struct max77650_regulator_desc max77650_LDO_desc = {
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.desc = {
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.name = "ldo",
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.of_match = of_match_ptr("ldo"),
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.regulators_node = of_match_ptr("regulators"),
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.supply_name = "in-ldo",
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.id = MAX77650_REGULATOR_ID_LDO,
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.ops = &max77650_regulator_LDO_ops,
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.min_uV = 1350000,
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.uV_step = 12500,
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.n_voltages = 128,
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.vsel_mask = MAX77650_REGULATOR_V_LDO_MASK,
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.vsel_reg = MAX77650_REG_CNFG_LDO_A,
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.active_discharge_off = MAX77650_REGULATOR_AD_DISABLED,
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.active_discharge_on = MAX77650_REGULATOR_AD_ENABLED,
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.active_discharge_mask = MAX77650_REGULATOR_AD_MASK,
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.active_discharge_reg = MAX77650_REG_CNFG_LDO_B,
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.enable_time = 100,
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.type = REGULATOR_VOLTAGE,
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.owner = THIS_MODULE,
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},
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.regA = MAX77650_REG_CNFG_LDO_A,
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.regB = MAX77650_REG_CNFG_LDO_B,
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};
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static struct max77650_regulator_desc max77650_SBB0_desc = {
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.desc = {
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.name = "sbb0",
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.of_match = of_match_ptr("sbb0"),
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.regulators_node = of_match_ptr("regulators"),
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.supply_name = "in-sbb0",
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.id = MAX77650_REGULATOR_ID_SBB0,
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.ops = &max77650_regulator_SBB_ops,
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.min_uV = 800000,
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.uV_step = 25000,
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.n_voltages = 64,
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.vsel_mask = MAX77650_REGULATOR_V_SBB_MASK,
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.vsel_reg = MAX77650_REG_CNFG_SBB0_A,
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.active_discharge_off = MAX77650_REGULATOR_AD_DISABLED,
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.active_discharge_on = MAX77650_REGULATOR_AD_ENABLED,
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.active_discharge_mask = MAX77650_REGULATOR_AD_MASK,
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.active_discharge_reg = MAX77650_REG_CNFG_SBB0_B,
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.enable_time = 100,
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.type = REGULATOR_VOLTAGE,
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.owner = THIS_MODULE,
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.csel_reg = MAX77650_REG_CNFG_SBB0_A,
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.csel_mask = MAX77650_REGULATOR_CURR_LIM_MASK,
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.curr_table = max77650_current_limit_table,
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.n_current_limits = ARRAY_SIZE(max77650_current_limit_table),
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},
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.regA = MAX77650_REG_CNFG_SBB0_A,
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.regB = MAX77650_REG_CNFG_SBB0_B,
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};
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static struct max77650_regulator_desc max77650_SBB1_desc = {
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.desc = {
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.name = "sbb1",
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.of_match = of_match_ptr("sbb1"),
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.regulators_node = of_match_ptr("regulators"),
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.supply_name = "in-sbb1",
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.id = MAX77650_REGULATOR_ID_SBB1,
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.ops = &max77650_regulator_SBB_ops,
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.min_uV = 800000,
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.uV_step = 12500,
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.n_voltages = 64,
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.vsel_mask = MAX77650_REGULATOR_V_SBB_MASK,
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.vsel_reg = MAX77650_REG_CNFG_SBB1_A,
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.active_discharge_off = MAX77650_REGULATOR_AD_DISABLED,
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.active_discharge_on = MAX77650_REGULATOR_AD_ENABLED,
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.active_discharge_mask = MAX77650_REGULATOR_AD_MASK,
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.active_discharge_reg = MAX77650_REG_CNFG_SBB1_B,
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.enable_time = 100,
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.type = REGULATOR_VOLTAGE,
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.owner = THIS_MODULE,
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.csel_reg = MAX77650_REG_CNFG_SBB1_A,
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.csel_mask = MAX77650_REGULATOR_CURR_LIM_MASK,
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.curr_table = max77650_current_limit_table,
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.n_current_limits = ARRAY_SIZE(max77650_current_limit_table),
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},
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.regA = MAX77650_REG_CNFG_SBB1_A,
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.regB = MAX77650_REG_CNFG_SBB1_B,
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};
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static struct max77650_regulator_desc max77651_SBB1_desc = {
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.desc = {
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.name = "sbb1",
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.of_match = of_match_ptr("sbb1"),
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.regulators_node = of_match_ptr("regulators"),
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.supply_name = "in-sbb1",
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.id = MAX77650_REGULATOR_ID_SBB1,
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.ops = &max77651_SBB1_regulator_ops,
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.volt_table = max77651_sbb1_regulator_volt_table,
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.n_voltages = ARRAY_SIZE(max77651_sbb1_regulator_volt_table),
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.vsel_mask = MAX77650_REGULATOR_V_SBB_MASK,
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.vsel_reg = MAX77650_REG_CNFG_SBB1_A,
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.active_discharge_off = MAX77650_REGULATOR_AD_DISABLED,
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.active_discharge_on = MAX77650_REGULATOR_AD_ENABLED,
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.active_discharge_mask = MAX77650_REGULATOR_AD_MASK,
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.active_discharge_reg = MAX77650_REG_CNFG_SBB1_B,
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.enable_time = 100,
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.type = REGULATOR_VOLTAGE,
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.owner = THIS_MODULE,
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.csel_reg = MAX77650_REG_CNFG_SBB1_A,
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.csel_mask = MAX77650_REGULATOR_CURR_LIM_MASK,
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.curr_table = max77650_current_limit_table,
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.n_current_limits = ARRAY_SIZE(max77650_current_limit_table),
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},
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.regA = MAX77650_REG_CNFG_SBB1_A,
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.regB = MAX77650_REG_CNFG_SBB1_B,
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};
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static struct max77650_regulator_desc max77650_SBB2_desc = {
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.desc = {
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.name = "sbb2",
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.of_match = of_match_ptr("sbb2"),
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.regulators_node = of_match_ptr("regulators"),
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.supply_name = "in-sbb0",
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.id = MAX77650_REGULATOR_ID_SBB2,
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.ops = &max77650_regulator_SBB_ops,
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.min_uV = 800000,
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.uV_step = 50000,
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.n_voltages = 64,
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.vsel_mask = MAX77650_REGULATOR_V_SBB_MASK,
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.vsel_reg = MAX77650_REG_CNFG_SBB2_A,
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.active_discharge_off = MAX77650_REGULATOR_AD_DISABLED,
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.active_discharge_on = MAX77650_REGULATOR_AD_ENABLED,
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.active_discharge_mask = MAX77650_REGULATOR_AD_MASK,
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.active_discharge_reg = MAX77650_REG_CNFG_SBB2_B,
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.enable_time = 100,
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.type = REGULATOR_VOLTAGE,
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.owner = THIS_MODULE,
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.csel_reg = MAX77650_REG_CNFG_SBB2_A,
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.csel_mask = MAX77650_REGULATOR_CURR_LIM_MASK,
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.curr_table = max77650_current_limit_table,
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.n_current_limits = ARRAY_SIZE(max77650_current_limit_table),
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},
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.regA = MAX77650_REG_CNFG_SBB2_A,
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.regB = MAX77650_REG_CNFG_SBB2_B,
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};
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static struct max77650_regulator_desc max77651_SBB2_desc = {
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.desc = {
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.name = "sbb2",
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.of_match = of_match_ptr("sbb2"),
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.regulators_node = of_match_ptr("regulators"),
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.supply_name = "in-sbb0",
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.id = MAX77650_REGULATOR_ID_SBB2,
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.ops = &max77650_regulator_SBB_ops,
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.min_uV = 2400000,
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.uV_step = 50000,
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.n_voltages = 64,
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.vsel_mask = MAX77650_REGULATOR_V_SBB_MASK,
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.vsel_reg = MAX77650_REG_CNFG_SBB2_A,
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.active_discharge_off = MAX77650_REGULATOR_AD_DISABLED,
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.active_discharge_on = MAX77650_REGULATOR_AD_ENABLED,
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.active_discharge_mask = MAX77650_REGULATOR_AD_MASK,
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.active_discharge_reg = MAX77650_REG_CNFG_SBB2_B,
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.enable_time = 100,
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.type = REGULATOR_VOLTAGE,
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.owner = THIS_MODULE,
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.csel_reg = MAX77650_REG_CNFG_SBB2_A,
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.csel_mask = MAX77650_REGULATOR_CURR_LIM_MASK,
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.curr_table = max77650_current_limit_table,
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.n_current_limits = ARRAY_SIZE(max77650_current_limit_table),
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},
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.regA = MAX77650_REG_CNFG_SBB2_A,
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.regB = MAX77650_REG_CNFG_SBB2_B,
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};
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static int max77650_regulator_probe(struct platform_device *pdev)
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{
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struct max77650_regulator_desc **rdescs;
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struct max77650_regulator_desc *rdesc;
|
|
struct regulator_config config = { };
|
|
struct device *dev, *parent;
|
|
struct regulator_dev *rdev;
|
|
struct regmap *map;
|
|
unsigned int val;
|
|
int i, rv;
|
|
|
|
dev = &pdev->dev;
|
|
parent = dev->parent;
|
|
|
|
if (!dev->of_node)
|
|
dev->of_node = parent->of_node;
|
|
|
|
rdescs = devm_kcalloc(dev, MAX77650_REGULATOR_NUM_REGULATORS,
|
|
sizeof(*rdescs), GFP_KERNEL);
|
|
if (!rdescs)
|
|
return -ENOMEM;
|
|
|
|
map = dev_get_regmap(parent, NULL);
|
|
if (!map)
|
|
return -ENODEV;
|
|
|
|
rv = regmap_read(map, MAX77650_REG_CID, &val);
|
|
if (rv)
|
|
return rv;
|
|
|
|
rdescs[MAX77650_REGULATOR_ID_LDO] = &max77650_LDO_desc;
|
|
rdescs[MAX77650_REGULATOR_ID_SBB0] = &max77650_SBB0_desc;
|
|
|
|
switch (MAX77650_CID_BITS(val)) {
|
|
case MAX77650_CID_77650A:
|
|
case MAX77650_CID_77650C:
|
|
rdescs[MAX77650_REGULATOR_ID_SBB1] = &max77650_SBB1_desc;
|
|
rdescs[MAX77650_REGULATOR_ID_SBB2] = &max77650_SBB2_desc;
|
|
break;
|
|
case MAX77650_CID_77651A:
|
|
case MAX77650_CID_77651B:
|
|
rdescs[MAX77650_REGULATOR_ID_SBB1] = &max77651_SBB1_desc;
|
|
rdescs[MAX77650_REGULATOR_ID_SBB2] = &max77651_SBB2_desc;
|
|
break;
|
|
default:
|
|
return -ENODEV;
|
|
}
|
|
|
|
config.dev = parent;
|
|
|
|
for (i = 0; i < MAX77650_REGULATOR_NUM_REGULATORS; i++) {
|
|
rdesc = rdescs[i];
|
|
config.driver_data = rdesc;
|
|
|
|
rdev = devm_regulator_register(dev, &rdesc->desc, &config);
|
|
if (IS_ERR(rdev))
|
|
return PTR_ERR(rdev);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct platform_driver max77650_regulator_driver = {
|
|
.driver = {
|
|
.name = "max77650-regulator",
|
|
},
|
|
.probe = max77650_regulator_probe,
|
|
};
|
|
module_platform_driver(max77650_regulator_driver);
|
|
|
|
MODULE_DESCRIPTION("MAXIM 77650/77651 regulator driver");
|
|
MODULE_AUTHOR("Bartosz Golaszewski <bgolaszewski@baylibre.com>");
|
|
MODULE_LICENSE("GPL v2");
|