From 332b1bc1a981405d694b8fbf8651f09c98f3951a Mon Sep 17 00:00:00 2001 From: Alistair Francis Date: Sun, 7 Feb 2021 09:45:55 -0800 Subject: [PATCH] rM2: mfd: Copy the rM2 sy7636a driver Copy the rM2 zero-sugar branch (https://github.com/reMarkable/linux/tree/zero-sugar) to the new kernel. Signed-off-by: Alistair Francis --- drivers/mfd/Kconfig | 10 ++ drivers/mfd/Makefile | 1 + drivers/mfd/sy7636a.c | 251 ++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 262 insertions(+) create mode 100644 drivers/mfd/sy7636a.c diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig index 3df0e4f88a36..5a16a742a5ff 100644 --- a/drivers/mfd/Kconfig +++ b/drivers/mfd/Kconfig @@ -1399,6 +1399,16 @@ config MFD_PALMAS If you say yes here you get support for the Palmas series of PMIC chips from Texas Instruments. +config MFD_SY7636A + tristate "Silergy SY7636A Power Management chip driver" + select MFD_CORE + select REGMAP_I2C + select REGMAP_IRQ + depends on I2C=y + help + If you say yes here you get support for the SY7636A + PMIC chip from Silergy + config TPS6105X tristate "TI TPS61050/61052 Boost Converters" depends on I2C diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile index 836520f4154e..417beb3c7aed 100644 --- a/drivers/mfd/Makefile +++ b/drivers/mfd/Makefile @@ -236,6 +236,7 @@ obj-$(CONFIG_MFD_HI655X_PMIC) += hi655x-pmic.o obj-$(CONFIG_MFD_DLN2) += dln2.o obj-$(CONFIG_MFD_RT5033) += rt5033.o obj-$(CONFIG_MFD_SKY81452) += sky81452.o +obj-$(CONFIG_MFD_SY7636A) += sy7636a.o intel-soc-pmic-objs := intel_soc_pmic_core.o intel_soc_pmic_crc.o obj-$(CONFIG_INTEL_SOC_PMIC) += intel-soc-pmic.o diff --git a/drivers/mfd/sy7636a.c b/drivers/mfd/sy7636a.c new file mode 100644 index 000000000000..136e7b6d8a5b --- /dev/null +++ b/drivers/mfd/sy7636a.c @@ -0,0 +1,251 @@ +/* + * MFD driver for SY7636A chip + * + * Copyright (C) 2019 reMarkable AS - http://www.remarkable.com/ + * + * Author: Lars Ivar Miljeteig + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License as + * published by the Free Software Foundation version 2. + * + * This program is distributed "as is" WITHOUT ANY WARRANTY of any + * kind, whether express or implied; without even the implied warranty + * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * Based on the lp87565 driver by Keerthy + */ + +#include +#include +#include +#include +#include +#include + +#include + +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 *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", +}; + +int 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 << 8); + + return (val & 0x1FF) * 10; +} + +int set_vcom_voltage_mv(struct regmap *regmap, unsigned int vcom) +{ + int ret; + unsigned int val; + + if (vcom < 0 || vcom > 5000) + return -EINVAL; + + val = (unsigned int)(vcom / 10) & 0x1ff; + + 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 >> 8); + 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 >> 1; + + 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, S_IRUGO, state_show, NULL); + +static ssize_t powergood_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 &= 0x01; + + return snprintf(buf, PAGE_SIZE, "%s\n", val ? "ON" : "OFF"); +} +static DEVICE_ATTR(power_good, S_IRUGO, powergood_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 = 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 = set_vcom_voltage_mv(sy7636a->regmap, (unsigned int)(-vcom)); + if (ret) + return ret; + + return count; +} +static DEVICE_ATTR(vcom, S_IRUGO | S_IWUSR, 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(struct sy7636a), GFP_KERNEL); + if (sy7636a == NULL) + 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 mfd 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 "); +MODULE_DESCRIPTION("Silergy SY7636A Multi-Function Device Driver"); +MODULE_LICENSE("GPL v2");