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regulator: Add MAX20086-MAX20089 driver
The MAX20086-MAX20089 are dual/quad power protectors for cameras. Add a driver that supports controlling the outputs individually. Additional features, such as overcurrent detection, may be added later if needed. Signed-off-by: Watson Chow <watson.chow@avnet.com> Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Link: https://lore.kernel.org/r/20220106224350.16957-3-laurent.pinchart+renesas@ideasonboard.com Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Watson Chow
Mark Brown
parent
764aaa4e03
commit
bfff546aae
@ -11558,6 +11558,13 @@ S: Maintained
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F: Documentation/devicetree/bindings/power/supply/maxim,max17042.yaml
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F: drivers/power/supply/max17042_battery.c
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MAXIM MAX20086 CAMERA POWER PROTECTOR DRIVER
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M: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
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L: linux-kernel@vger.kernel.org
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S: Maintained
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F: Documentation/devicetree/bindings/regulator/maxim,max20086.yaml
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F: drivers/regulator/max20086-regulator.c
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MAXIM MAX77650 PMIC MFD DRIVER
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M: Bartosz Golaszewski <brgl@bgdev.pl>
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L: linux-kernel@vger.kernel.org
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@ -636,6 +636,15 @@ config REGULATOR_MAX8998
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via I2C bus. The provided regulator is suitable for S3C6410
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and S5PC1XX chips to control VCC_CORE and VCC_USIM voltages.
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config REGULATOR_MAX20086
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tristate "Maxim MAX20086-MAX20089 Camera Power Protectors"
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depends on I2C
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select REGMAP_I2C
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help
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This driver controls a Maxim MAX20086-MAX20089 camera power
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protectorvia I2C bus. The regulator has 2 or 4 outputs depending on
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the device model. This driver is only capable to turn on/off them.
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config REGULATOR_MAX77686
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tristate "Maxim 77686 regulator"
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depends on MFD_MAX77686 || COMPILE_TEST
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@ -1424,4 +1433,3 @@ config REGULATOR_QCOM_LABIBB
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for LCD display panel.
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endif
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@ -78,6 +78,7 @@ obj-$(CONFIG_REGULATOR_MAX8952) += max8952.o
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obj-$(CONFIG_REGULATOR_MAX8973) += max8973-regulator.o
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obj-$(CONFIG_REGULATOR_MAX8997) += max8997-regulator.o
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obj-$(CONFIG_REGULATOR_MAX8998) += max8998.o
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obj-$(CONFIG_REGULATOR_MAX20086) += max20086-regulator.o
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obj-$(CONFIG_REGULATOR_MAX77686) += max77686-regulator.o
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obj-$(CONFIG_REGULATOR_MAX77693) += max77693-regulator.o
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obj-$(CONFIG_REGULATOR_MAX77802) += max77802-regulator.o
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332
drivers/regulator/max20086-regulator.c
Normal file
332
drivers/regulator/max20086-regulator.c
Normal file
@ -0,0 +1,332 @@
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// SPDX-License-Identifier: GPL-2.0-or-later
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//
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// max20086-regulator.c - MAX20086-MAX20089 camera power protector driver
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//
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// Copyright (C) 2022 Laurent Pinchart <laurent.pinchart@idesonboard.com>
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// Copyright (C) 2018 Avnet, Inc.
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#include <linux/err.h>
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#include <linux/gpio.h>
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#include <linux/i2c.h>
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#include <linux/module.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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#include <linux/slab.h>
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/* Register Offset */
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#define MAX20086_REG_MASK 0x00
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#define MAX20086_REG_CONFIG 0x01
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#define MAX20086_REG_ID 0x02
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#define MAX20086_REG_STAT1 0x03
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#define MAX20086_REG_STAT2_L 0x04
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#define MAX20086_REG_STAT2_H 0x05
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#define MAX20086_REG_ADC1 0x06
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#define MAX20086_REG_ADC2 0x07
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#define MAX20086_REG_ADC3 0x08
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#define MAX20086_REG_ADC4 0x09
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/* DEVICE IDs */
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#define MAX20086_DEVICE_ID_MAX20086 0x40
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#define MAX20086_DEVICE_ID_MAX20087 0x20
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#define MAX20086_DEVICE_ID_MAX20088 0x10
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#define MAX20086_DEVICE_ID_MAX20089 0x00
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#define DEVICE_ID_MASK 0xf0
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/* Register bits */
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#define MAX20086_EN_MASK 0x0f
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#define MAX20086_EN_OUT1 0x01
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#define MAX20086_EN_OUT2 0x02
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#define MAX20086_EN_OUT3 0x04
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#define MAX20086_EN_OUT4 0x08
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#define MAX20086_INT_DISABLE_ALL 0x3f
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#define MAX20086_MAX_REGULATORS 4
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struct max20086_chip_info {
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u8 id;
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unsigned int num_outputs;
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};
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struct max20086_regulator {
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struct device_node *of_node;
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struct regulator_init_data *init_data;
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const struct regulator_desc *desc;
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struct regulator_dev *rdev;
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};
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struct max20086 {
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struct device *dev;
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struct regmap *regmap;
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struct gpio_desc *ena_gpiod;
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const struct max20086_chip_info *info;
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struct max20086_regulator regulators[MAX20086_MAX_REGULATORS];
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};
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static const struct regulator_ops max20086_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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};
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#define MAX20086_REGULATOR_DESC(n) \
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{ \
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.name = "OUT"#n, \
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.supply_name = "in", \
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.id = (n) - 1, \
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.ops = &max20086_buck_ops, \
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.type = REGULATOR_VOLTAGE, \
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.owner = THIS_MODULE, \
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.enable_reg = MAX20086_REG_CONFIG, \
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.enable_mask = 1 << ((n) - 1), \
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.enable_val = 1 << ((n) - 1), \
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.disable_val = 0, \
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}
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static const char * const max20086_output_names[] = {
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"OUT1",
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"OUT2",
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"OUT3",
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"OUT4",
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};
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static const struct regulator_desc max20086_regulators[] = {
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MAX20086_REGULATOR_DESC(1),
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MAX20086_REGULATOR_DESC(2),
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MAX20086_REGULATOR_DESC(3),
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MAX20086_REGULATOR_DESC(4),
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};
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static int max20086_regulators_register(struct max20086 *chip)
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{
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unsigned int i;
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for (i = 0; i < chip->info->num_outputs; i++) {
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struct max20086_regulator *reg = &chip->regulators[i];
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struct regulator_config config = { };
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struct regulator_dev *rdev;
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config.dev = chip->dev;
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config.init_data = reg->init_data;
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config.driver_data = chip;
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config.of_node = reg->of_node;
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config.regmap = chip->regmap;
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config.ena_gpiod = chip->ena_gpiod;
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rdev = devm_regulator_register(chip->dev, reg->desc, &config);
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if (IS_ERR(rdev)) {
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dev_err(chip->dev,
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"Failed to register regulator output %s\n",
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reg->desc->name);
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return PTR_ERR(rdev);
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}
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reg->rdev = rdev;
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}
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return 0;
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}
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static int max20086_parse_regulators_dt(struct max20086 *chip, bool *boot_on)
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{
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struct of_regulator_match matches[MAX20086_MAX_REGULATORS] = { };
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struct device_node *node;
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unsigned int i;
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int ret;
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node = of_get_child_by_name(chip->dev->of_node, "regulators");
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if (!node) {
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dev_err(chip->dev, "regulators node not found\n");
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return PTR_ERR(node);
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}
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for (i = 0; i < chip->info->num_outputs; ++i)
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matches[i].name = max20086_output_names[i];
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ret = of_regulator_match(chip->dev, node, matches,
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chip->info->num_outputs);
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of_node_put(node);
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if (ret < 0) {
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dev_err(chip->dev, "Failed to match regulators\n");
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return -EINVAL;
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}
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*boot_on = false;
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for (i = 0; i < chip->info->num_outputs; i++) {
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struct max20086_regulator *reg = &chip->regulators[i];
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reg->init_data = matches[i].init_data;
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reg->of_node = matches[i].of_node;
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reg->desc = &max20086_regulators[i];
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if (reg->init_data) {
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if (reg->init_data->constraints.always_on ||
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reg->init_data->constraints.boot_on)
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*boot_on = true;
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}
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}
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return 0;
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}
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static int max20086_detect(struct max20086 *chip)
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{
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unsigned int data;
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int ret;
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ret = regmap_read(chip->regmap, MAX20086_REG_ID, &data);
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if (ret < 0) {
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dev_err(chip->dev, "Failed to read DEVICE_ID reg: %d\n", ret);
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return ret;
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}
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if ((data & DEVICE_ID_MASK) != chip->info->id) {
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dev_err(chip->dev, "Invalid device ID 0x%02x\n", data);
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return -ENXIO;
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}
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return 0;
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}
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static bool max20086_gen_is_writeable_reg(struct device *dev, unsigned int reg)
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{
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switch (reg) {
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case MAX20086_REG_MASK:
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case MAX20086_REG_CONFIG:
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return true;
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default:
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return false;
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}
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}
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static const struct regmap_config max20086_regmap_config = {
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.reg_bits = 8,
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.val_bits = 8,
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.writeable_reg = max20086_gen_is_writeable_reg,
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.max_register = 0x9,
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.cache_type = REGCACHE_NONE,
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};
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static int max20086_i2c_probe(struct i2c_client *i2c)
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{
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struct max20086 *chip;
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enum gpiod_flags flags;
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bool boot_on;
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int ret;
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chip = devm_kzalloc(&i2c->dev, sizeof(*chip), GFP_KERNEL);
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if (!chip)
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return -ENOMEM;
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chip->dev = &i2c->dev;
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chip->info = device_get_match_data(chip->dev);
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i2c_set_clientdata(i2c, chip);
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chip->regmap = devm_regmap_init_i2c(i2c, &max20086_regmap_config);
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if (IS_ERR(chip->regmap)) {
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ret = PTR_ERR(chip->regmap);
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dev_err(chip->dev, "Failed to allocate register map: %d\n", ret);
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return ret;
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}
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ret = max20086_parse_regulators_dt(chip, &boot_on);
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if (ret < 0)
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return ret;
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ret = max20086_detect(chip);
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if (ret < 0)
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return ret;
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/* Until IRQ support is added, just disable all interrupts. */
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ret = regmap_update_bits(chip->regmap, MAX20086_REG_MASK,
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MAX20086_INT_DISABLE_ALL,
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MAX20086_INT_DISABLE_ALL);
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if (ret < 0) {
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dev_err(chip->dev, "Failed to disable interrupts: %d\n", ret);
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return ret;
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}
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/*
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* Get the enable GPIO. If any of the outputs is marked as being
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* enabled at boot, request the GPIO with an initial high state to
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* avoid disabling outputs that may have been turned on by the boot
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* loader. Otherwise, request it with a low state to enter lower-power
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* shutdown.
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*/
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flags = boot_on ? GPIOD_OUT_HIGH : GPIOD_OUT_LOW;
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chip->ena_gpiod = devm_gpiod_get(chip->dev, "enable", flags);
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if (IS_ERR(chip->ena_gpiod)) {
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ret = PTR_ERR(chip->ena_gpiod);
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dev_err(chip->dev, "Failed to get enable GPIO: %d\n", ret);
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return ret;
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}
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ret = max20086_regulators_register(chip);
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if (ret < 0) {
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dev_err(chip->dev, "Failed to register regulators: %d\n", ret);
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return ret;
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}
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return 0;
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}
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static const struct i2c_device_id max20086_i2c_id[] = {
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{ "max20086" },
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{ "max20087" },
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{ "max20088" },
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{ "max20089" },
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{ /* Sentinel */ },
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};
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MODULE_DEVICE_TABLE(i2c, max20086_i2c_id);
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static const struct of_device_id max20086_dt_ids[] = {
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{
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.compatible = "maxim,max20086",
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.data = &(const struct max20086_chip_info) {
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.id = MAX20086_DEVICE_ID_MAX20086,
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.num_outputs = 4,
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}
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}, {
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.compatible = "maxim,max20087",
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.data = &(const struct max20086_chip_info) {
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.id = MAX20086_DEVICE_ID_MAX20087,
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.num_outputs = 4,
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}
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}, {
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.compatible = "maxim,max20088",
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.data = &(const struct max20086_chip_info) {
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.id = MAX20086_DEVICE_ID_MAX20088,
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.num_outputs = 2,
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}
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}, {
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.compatible = "maxim,max20089",
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.data = &(const struct max20086_chip_info) {
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.id = MAX20086_DEVICE_ID_MAX20089,
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.num_outputs = 2,
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}
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},
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{ /* Sentinel */ },
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};
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MODULE_DEVICE_TABLE(of, max20086_dt_ids);
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static struct i2c_driver max20086_regulator_driver = {
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.driver = {
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.name = "max20086",
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.of_match_table = of_match_ptr(max20086_dt_ids),
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},
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.probe_new = max20086_i2c_probe,
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.id_table = max20086_i2c_id,
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};
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module_i2c_driver(max20086_regulator_driver);
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MODULE_AUTHOR("Watson Chow <watson.chow@avnet.com>");
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MODULE_DESCRIPTION("MAX20086-MAX20089 Camera Power Protector Driver");
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MODULE_LICENSE("GPL");
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