Messages in this thread Patch in this message | | | From | Naresh Solanki <> | Subject | [PATCH v2 2/5] mfd: max597x: Add support for MAX5970 and MAX5978 | Date | Thu, 7 Jul 2022 15:41:38 +0200 |
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From: Patrick Rudolph <patrick.rudolph@9elements.com>
Implement a regulator driver with IRQ support for fault management. Written against documentation [1] and [2] and tested on real hardware.
Every channel has it's own regulator supply nammed 'vss1-supply' and 'vss2-supply'. The regulator supply is used to determine the output voltage, as the smart switch provides no output regulation. The driver requires the 'shunt-resistor-micro-ohms' to be present in the devicetree to properly calculate current related values.
You must specify compatible devictree layout:
regulator@3a { reg = <0x3a>; vss1-supply = <&p3v3>; compatible = "maxim,max5978";
...
regulators { sw0_ref: SW0 { regulator-compatible = "SW0"; shunt-resistor-micro-ohms = <12000>; ... } } }
1: https://datasheets.maximintegrated.com/en/ds/MAX5970.pdf 2: https://datasheets.maximintegrated.com/en/ds/MAX5978.pdf
Signed-off-by: Patrick Rudolph <patrick.rudolph@9elements.com> Signed-off-by: Marcello Sylvester Bauer <sylv@sylv.io> Signed-off-by: Naresh Solanki <Naresh.Solanki@9elements.com> --- drivers/mfd/Kconfig | 12 ++++ drivers/mfd/Makefile | 2 + drivers/mfd/max597x.c | 109 ++++++++++++++++++++++++++++++++++++ include/linux/mfd/max597x.h | 100 +++++++++++++++++++++++++++++++++ 4 files changed, 223 insertions(+) create mode 100644 drivers/mfd/max597x.c create mode 100644 include/linux/mfd/max597x.h
diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig index 3b59456f5545..2422ae155118 100644 --- a/drivers/mfd/Kconfig +++ b/drivers/mfd/Kconfig @@ -253,6 +253,18 @@ config MFD_MADERA_SPI Support for the Cirrus Logic Madera platform audio SoC core functionality controlled via SPI. +config MFD_MAX597X + tristate "Maxim 597x power switch and monitor" + depends on I2C + depends on OF + select MFD_CORE + select REGMAP_I2C + help + This driver controls a Maxim 5970/5978 switch via I2C bus. + The MAX5970/5978 is a smart switch with no output regulation, but + fault protection and voltage and current monitoring capabilities. + Also it supports upto 4 indication leds. + config MFD_CS47L15 bool "Cirrus Logic CS47L15" select PINCTRL_CS47L15 diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile index 858cacf659d6..f5f46b86401f 100644 --- a/drivers/mfd/Makefile +++ b/drivers/mfd/Makefile @@ -95,6 +95,8 @@ obj-$(CONFIG_MFD_MADERA) += madera.o obj-$(CONFIG_MFD_MADERA_I2C) += madera-i2c.o obj-$(CONFIG_MFD_MADERA_SPI) += madera-spi.o +obj-$(CONFIG_MFD_MAX597X) += max597x.o + obj-$(CONFIG_TPS6105X) += tps6105x.o obj-$(CONFIG_TPS65010) += tps65010.o obj-$(CONFIG_TPS6507X) += tps6507x.o diff --git a/drivers/mfd/max597x.c b/drivers/mfd/max597x.c new file mode 100644 index 000000000000..b2450e64d3eb --- /dev/null +++ b/drivers/mfd/max597x.c @@ -0,0 +1,109 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Device driver for regulators in MAX5970 and MAX5978 IC + * + * Copyright (c) 2022 9elements GmbH + * + * Author: Patrick Rudolph <patrick.rudolph@9elements.com> + */ + +#include <linux/bitops.h> +#include <linux/device.h> +#include <linux/err.h> +#include <linux/leds.h> +#include <linux/module.h> +#include <linux/io.h> +#include <linux/of.h> +#include <linux/i2c.h> +#include <linux/mfd/core.h> +#include <linux/regmap.h> +#include <linux/regulator/driver.h> +#include <linux/regulator/machine.h> +#include <linux/regulator/of_regulator.h> +#include <linux/version.h> +#include <linux/mfd/max597x.h> + +static const struct regmap_config max597x_regmap_config = { + .reg_bits = 8, + .val_bits = 8, + .max_register = MAX_REGISTERS, +}; + +static const struct mfd_cell max597x_devs[] = { + { + .name = "max597x-regulator", + }, + { + .name = "max597x-iio", + }, + { + .name = "max597x-led", + }, +}; + +static int max597x_probe(struct i2c_client *i2c, const struct i2c_device_id *id) +{ + struct max597x_data *max597x; + struct regmap *regmap; + enum max597x_chip_type chip = id->driver_data; + + max597x = + devm_kzalloc(&i2c->dev, sizeof(struct max597x_data), GFP_KERNEL); + switch (chip) { + case MAX597x_TYPE_MAX5970: + max597x->num_switches = 2; + break; + case MAX597x_TYPE_MAX5978: + max597x->num_switches = 1; + break; + } + + regmap = devm_regmap_init_i2c(i2c, &max597x_regmap_config); + if (IS_ERR(regmap)) { + dev_err(&i2c->dev, "No regmap\n"); + return -EINVAL; + } + max597x->regmap = regmap; + max597x->irq = i2c->irq; + max597x->dev = &i2c->dev; + i2c_set_clientdata(i2c, max597x); + + return devm_mfd_add_devices(max597x->dev, PLATFORM_DEVID_AUTO, + max597x_devs, ARRAY_SIZE(max597x_devs), + NULL, 0, NULL); +} + +static const struct i2c_device_id max597x_table[] = { + {.name = "max5970", MAX597x_TYPE_MAX5970}, + {.name = "max5978", MAX597x_TYPE_MAX5978}, + {}, +}; + +MODULE_DEVICE_TABLE(i2c, max597x_table); + +static const struct of_device_id max597x_of_match[] = { + { .compatible = "maxim,max5970", + .data = (void *)MAX597x_TYPE_MAX5970 + }, + { .compatible = "maxim,max5978", + .data = (void *)MAX597x_TYPE_MAX5978 + }, + {}, +}; + +MODULE_DEVICE_TABLE(of, max597x_of_match); + +static struct i2c_driver max597x_driver = { + .id_table = max597x_table, + .driver = { + .name = "max597x", + .of_match_table = of_match_ptr(max597x_of_match), + }, + .probe = max597x_probe, +}; + +module_i2c_driver(max597x_driver); + +MODULE_AUTHOR("Patrick Rudolph <patrick.rudolph@9elements.com>"); +MODULE_DESCRIPTION("MAX5970_hot-swap controller driver"); +MODULE_LICENSE("GPL v2"); diff --git a/include/linux/mfd/max597x.h b/include/linux/mfd/max597x.h new file mode 100644 index 000000000000..ac7e9c84d06c --- /dev/null +++ b/include/linux/mfd/max597x.h @@ -0,0 +1,100 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Device driver for regulators in MAX5970 and MAX5978 IC + * + * Copyright (c) 2022 9elements GmbH + * + * Author: Patrick Rudolph <patrick.rudolph@9elements.com> + */ + +#ifndef _MAX597X_H +#define _MAX597X_H + +#include <linux/regmap.h> + +#define MAX5970_NUM_SWITCHES 2 +#define MAX5978_NUM_SWITCHES 1 +#define MAX597X_NUM_LEDS 4 + +struct max597x_data { + struct device *dev; + int irq; + int num_switches; + struct regmap *regmap; + u32 irng[MAX5970_NUM_SWITCHES]; + u32 mon_rng[MAX5970_NUM_SWITCHES]; + u32 shunt_micro_ohms[MAX5970_NUM_SWITCHES]; +}; + +enum max597x_chip_type { + MAX597x_TYPE_MAX5978 = 1, + MAX597x_TYPE_MAX5970, +}; + +#define MAX5970_REG_CURRENT_L(ch) (0x01 + (ch) * 4) +#define MAX5970_REG_CURRENT_H(ch) (0x00 + (ch) * 4) +#define MAX5970_REG_VOLTAGE_L(ch) (0x03 + (ch) * 4) +#define MAX5970_REG_VOLTAGE_H(ch) (0x02 + (ch) * 4) +#define MAX5970_REG_MON_RANGE 0x18 +#define MAX5970_MON_MASK 0x3 +#define MAX5970_MON(reg, ch) \ + (((reg) >> ((ch) * 2)) & MAX5970_MON_MASK) +#define MAX5970_MON_MAX_RANGE_UV 16000000 + +#define MAX5970_REG_CH_UV_WARN_H(ch) (0x1A + (ch) * 10) +#define MAX5970_REG_CH_UV_WARN_L(ch) (0x1B + (ch) * 10) +#define MAX5970_REG_CH_UV_CRIT_H(ch) (0x1C + (ch) * 10) +#define MAX5970_REG_CH_UV_CRIT_L(ch) (0x1D + (ch) * 10) +#define MAX5970_REG_CH_OV_WARN_H(ch) (0x1E + (ch) * 10) +#define MAX5970_REG_CH_OV_WARN_L(ch) (0x1F + (ch) * 10) +#define MAX5970_REG_CH_OV_CRIT_H(ch) (0x20 + (ch) * 10) +#define MAX5970_REG_CH_OV_CRIT_L(ch) (0x21 + (ch) * 10) + +#define MAX5970_VAL2REG_H(x) (((x) >> 2) & 0xFF) +#define MAX5970_VAL2REG_L(x) ((x) & 0x3) + +#define MAX5970_REG_DAC_FAST(ch) (0x2E + (ch)) + +#define MAX5970_FAST2SLOW_RATIO 200 + +#define MAX5970_REG_STATUS0 0x31 +#define MAX5970_CB_IFAULTF(ch) (1 << (ch)) +#define MAX5970_CB_IFAULTS(ch) (1 << ((ch) + 4)) + +#define MAX5970_REG_STATUS1 0x32 +#define STATUS1_PROT_MASK 0x3 +#define STATUS1_PROT(reg) \ + (((reg) >> 6) & STATUS1_PROT_MASK) +#define STATUS1_PROT_SHUTDOWN 0 +#define STATUS1_PROT_CLEAR_PG 1 +#define STATUS1_PROT_ALERT_ONLY 2 + +#define MAX5970_REG_STATUS2 0x33 +#define MAX5970_IRNG_MASK 0x3 +#define MAX5970_IRNG(reg, ch) \ + (((reg) >> ((ch) * 2)) & MAX5970_IRNG_MASK) + +#define MAX5970_REG_STATUS3 0x34 +#define MAX5970_STATUS3_ALERT BIT(4) +#define MAX5970_STATUS3_PG(ch) BIT(ch) + +#define MAX5970_REG_FAULT0 0x35 +#define UV_STATUS_WARN(ch) (1 << (ch)) +#define UV_STATUS_CRIT(ch) (1 << ((ch) + 4)) + +#define MAX5970_REG_FAULT1 0x36 +#define OV_STATUS_WARN(ch) (1 << (ch)) +#define OV_STATUS_CRIT(ch) (1 << ((ch) + 4)) + +#define MAX5970_REG_FAULT2 0x37 +#define OC_STATUS_WARN(ch) (1 << (ch)) + +#define MAX5970_REG_CHXEN 0x3b +#define CHXEN(ch) (3 << ((ch) * 2)) + +#define MAX5970_REG_LED_FLASH 0x43 + +#define MAX_REGISTERS 0x49 +#define ADC_MASK 0x3FF + +#endif /* _MAX597X_H */ -- 2.35.3
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