Initial support for the Silergy SY7636A Power Management chip. Signed-off-by: Alistair Francis <alistair@xxxxxxxxxxxxx> --- v3: - Address comments in V2 - Drop regulator patches drivers/mfd/Kconfig | 10 ++ drivers/mfd/Makefile | 1 + drivers/mfd/sy7636a.c | 246 ++++++++++++++++++++++++++++++++++++ include/linux/mfd/sy7636a.h | 46 +++++++ 4 files changed, 303 insertions(+) create mode 100644 drivers/mfd/sy7636a.c create mode 100644 include/linux/mfd/sy7636a.h diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig index b74efa469e90..a285d11d5be3 100644 --- a/drivers/mfd/Kconfig +++ b/drivers/mfd/Kconfig @@ -1351,6 +1351,16 @@ config MFD_SYSCON Select this option to enable accessing system control registers via regmap. +config MFD_SY7636A + tristate "Silergy SY7636A Power Management chip" + select MFD_CORE + select REGMAP_I2C + select REGMAP_IRQ + depends on I2C=y + help + Select this option to enable support for the Silergy SY7636A + Power Management chip. + config MFD_DAVINCI_VOICECODEC tristate select MFD_CORE diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile index 834f5463af28..5bfa0d6e5dc5 100644 --- a/drivers/mfd/Makefile +++ b/drivers/mfd/Makefile @@ -265,6 +265,7 @@ obj-$(CONFIG_MFD_STMFX) += stmfx.o obj-$(CONFIG_MFD_KHADAS_MCU) += khadas-mcu.o obj-$(CONFIG_MFD_ACER_A500_EC) += acer-ec-a500.o +obj-$(CONFIG_MFD_SY7636A) += sy7636a.o obj-$(CONFIG_SGI_MFD_IOC3) += ioc3.o obj-$(CONFIG_MFD_SIMPLE_MFD_I2C) += simple-mfd-i2c.o obj-$(CONFIG_MFD_INTEL_M10_BMC) += intel-m10-bmc.o diff --git a/drivers/mfd/sy7636a.c b/drivers/mfd/sy7636a.c new file mode 100644 index 000000000000..ecb7c58eb5f4 --- /dev/null +++ b/drivers/mfd/sy7636a.c @@ -0,0 +1,246 @@ +// SPDX-License-Identifier: GPL-2.0+ +// +// MFD parent driver for SY7636A chip +// +// Copyright (C) 2019 reMarkable AS - http://www.remarkable.com/ +// +// Authors: Lars Ivar Miljeteig <lars.ivar.miljeteig@xxxxxxxxxxxxxx> +// Alistair Francis <alistair@xxxxxxxxxxxxx> +// +// Based on the lp87565 driver by Keerthy <j-keerthy@xxxxxx> + +#include <linux/interrupt.h> +#include <linux/mfd/core.h> +#include <linux/module.h> +#include <linux/of_device.h> +#include <linux/regmap.h> +#include <linux/sysfs.h> + +#include <linux/mfd/sy7636a.h> + +static const struct regmap_config sy7636a_regmap_config = { + .reg_bits = 8, + .val_bits = 8, +}; + +static const struct mfd_cell sy7636a_cells[] = { + { .name = "sy7636a-regulator", }, + { .name = "sy7636a-temperature", }, + { .name = "sy7636a-thermal", }, +}; + +static const struct of_device_id of_sy7636a_match_table[] = { + { .compatible = "silergy,sy7636a", }, + {} +}; +MODULE_DEVICE_TABLE(of, of_sy7636a_match_table); + +static const char * const states[] = { + "no fault event", + "UVP at VP rail", + "UVP at VN rail", + "UVP at VPOS rail", + "UVP at VNEG rail", + "UVP at VDDH rail", + "UVP at VEE rail", + "SCP at VP rail", + "SCP at VN rail", + "SCP at VPOS rail", + "SCP at VNEG rail", + "SCP at VDDH rail", + "SCP at VEE rail", + "SCP at V COM rail", + "UVLO", + "Thermal shutdown", +}; + +static int sy7636a_get_vcom_voltage_mv(struct regmap *regmap) +{ + int ret; + unsigned int val, val_h; + + ret = regmap_read(regmap, SY7636A_REG_VCOM_ADJUST_CTRL_L, &val); + if (ret) + return ret; + + ret = regmap_read(regmap, SY7636A_REG_VCOM_ADJUST_CTRL_H, &val_h); + if (ret) + return ret; + + val |= (val_h << VCOM_ADJUST_CTRL_SHIFT); + + return (val & VCOM_ADJUST_CTRL_MASK) * VCOM_ADJUST_CTRL_SCAL; +} + +static int sy7636a_set_vcom_voltage_mv(struct regmap *regmap, unsigned int vcom) +{ + int ret; + unsigned int val; + + if (vcom < VCOM_MIN || vcom > VCOM_MAX) + return -EINVAL; + + val = (unsigned int)(vcom / VCOM_ADJUST_CTRL_SCAL) & VCOM_ADJUST_CTRL_MASK; + + ret = regmap_write(regmap, SY7636A_REG_VCOM_ADJUST_CTRL_L, val); + if (ret) + return ret; + + ret = regmap_write(regmap, SY7636A_REG_VCOM_ADJUST_CTRL_H, val >> VCOM_ADJUST_CTRL_SHIFT); + if (ret) + return ret; + + return 0; +} + +static ssize_t state_show(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + int ret; + unsigned int val; + struct sy7636a *sy7636a = dev_get_drvdata(dev); + + ret = regmap_read(sy7636a->regmap, SY7636A_REG_FAULT_FLAG, &val); + if (ret) { + dev_err(sy7636a->dev, "Failed to read from device\n"); + return ret; + } + + val = val >> FAULT_FLAG_SHIFT; + + if (val >= ARRAY_SIZE(states)) { + dev_err(sy7636a->dev, "Unexpected value read from device: %u\n", val); + return -EINVAL; + } + + return snprintf(buf, PAGE_SIZE, "%s\n", states[val]); +} +static DEVICE_ATTR(state, 0444, state_show, NULL); + +static ssize_t power_good_show(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + int ret; + unsigned int val; + struct sy7636a *sy7636a = dev_get_drvdata(dev); + + ret = regmap_read(sy7636a->regmap, SY7636A_REG_FAULT_FLAG, &val); + if (ret) { + dev_err(sy7636a->dev, "Failed to read from device\n"); + return ret; + } + + val &= (1 << FAULT_FLAG_SHIFT) - 1; + + return snprintf(buf, PAGE_SIZE, "%s\n", val ? "ON" : "OFF"); +} +static DEVICE_ATTR(power_good, 0444, power_good_show, NULL); + +static ssize_t vcom_show(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + int ret; + struct sy7636a *sy7636a = dev_get_drvdata(dev); + + ret = sy7636a_get_vcom_voltage_mv(sy7636a->regmap); + if (ret < 0) + return ret; + + return snprintf(buf, PAGE_SIZE, "%d\n", -ret); +} +static ssize_t vcom_store(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t count) +{ + int ret; + int vcom; + struct sy7636a *sy7636a = dev_get_drvdata(dev); + + ret = kstrtoint(buf, 0, &vcom); + if (ret) + return ret; + + if (vcom > 0 || vcom < -5000) + return -EINVAL; + + ret = sy7636a_set_vcom_voltage_mv(sy7636a->regmap, (unsigned int)(-vcom)); + if (ret) + return ret; + + return count; +} +static DEVICE_ATTR(vcom, 0644, vcom_show, vcom_store); + +static struct attribute *sy7636a_sysfs_attrs[] = { + &dev_attr_state.attr, + &dev_attr_power_good.attr, + &dev_attr_vcom.attr, + NULL, +}; + +static const struct attribute_group sy7636a_sysfs_attr_group = { + .attrs = sy7636a_sysfs_attrs, +}; + +static int sy7636a_probe(struct i2c_client *client, + const struct i2c_device_id *ids) +{ + struct sy7636a *sy7636a; + int ret; + + sy7636a = devm_kzalloc(&client->dev, sizeof(*sy7636a), GFP_KERNEL); + if (!sy7636a) + return -ENOMEM; + + sy7636a->dev = &client->dev; + + sy7636a->regmap = devm_regmap_init_i2c(client, &sy7636a_regmap_config); + if (IS_ERR(sy7636a->regmap)) { + ret = PTR_ERR(sy7636a->regmap); + dev_err(sy7636a->dev, + "Failed to initialize register map: %d\n", ret); + return ret; + } + + i2c_set_clientdata(client, sy7636a); + + ret = sysfs_create_group(&client->dev.kobj, &sy7636a_sysfs_attr_group); + if (ret) { + dev_err(sy7636a->dev, "Failed to create sysfs attributes\n"); + return ret; + } + + ret = devm_mfd_add_devices(sy7636a->dev, PLATFORM_DEVID_AUTO, + sy7636a_cells, ARRAY_SIZE(sy7636a_cells), + NULL, 0, NULL); + if (ret) { + dev_err(sy7636a->dev, "Failed to add child devices\n"); + sysfs_remove_group(&client->dev.kobj, &sy7636a_sysfs_attr_group); + return ret; + } + + return 0; +} + +static const struct i2c_device_id sy7636a_id_table[] = { + { "sy7636a", 0 }, + { }, +}; +MODULE_DEVICE_TABLE(i2c, sy7636a_id_table); + +static struct i2c_driver sy7636a_driver = { + .driver = { + .name = "sy7636a", + .of_match_table = of_sy7636a_match_table, + }, + .probe = sy7636a_probe, + .id_table = sy7636a_id_table, +}; +module_i2c_driver(sy7636a_driver); + +MODULE_AUTHOR("Lars Ivar Miljeteig <lars.ivar.miljeteig@xxxxxxxxxxxxxx>"); +MODULE_DESCRIPTION("Silergy SY7636A Multi-Function Device Driver"); +MODULE_LICENSE("GPL v2"); diff --git a/include/linux/mfd/sy7636a.h b/include/linux/mfd/sy7636a.h new file mode 100644 index 000000000000..a5ec5d911b3a --- /dev/null +++ b/include/linux/mfd/sy7636a.h @@ -0,0 +1,46 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * Functions to access SY3686A power management chip. + * + * Copyright (C) 2019 reMarkable AS - http://www.remarkable.com/ + */ + +#ifndef __MFD_SY7636A_H +#define __MFD_SY7636A_H + +#include <linux/i2c.h> +#include <linux/regmap.h> +#include <linux/regulator/driver.h> +#include <linux/regulator/machine.h> + +#define SY7636A_REG_OPERATION_MODE_CRL 0x00 +#define SY7636A_OPERATION_MODE_CRL_VCOMCTL BIT(6) +#define SY7636A_OPERATION_MODE_CRL_ONOFF BIT(7) +#define SY7636A_REG_VCOM_ADJUST_CTRL_L 0x01 +#define SY7636A_REG_VCOM_ADJUST_CTRL_H 0x02 +#define SY7636A_REG_VCOM_ADJUST_CTRL_MASK 0x01ff +#define SY7636A_REG_VLDO_VOLTAGE_ADJULST_CTRL 0x03 +#define SY7636A_REG_POWER_ON_DELAY_TIME 0x06 +#define SY7636A_REG_FAULT_FLAG 0x07 +#define SY7636A_FAULT_FLAG_PG BIT(0) +#define SY7636A_REG_TERMISTOR_READOUT 0x08 + +#define SY7636A_REG_MAX 0x08 + +#define VCOM_MIN 0 +#define VCOM_MAX 5000 + +#define VCOM_ADJUST_CTRL_MASK 0x1ff +// Used to shift the high byte +#define VCOM_ADJUST_CTRL_SHIFT 8 +// Used to scale from VCOM_ADJUST_CTRL to mv +#define VCOM_ADJUST_CTRL_SCAL 10 + +#define FAULT_FLAG_SHIFT 1 + +struct sy7636a { + struct device *dev; + struct regmap *regmap; +}; + +#endif /* __LINUX_MFD_SY7636A_H */ -- 2.30.1
