mfd: Initial commit of sy7636a
Initial support for the Silergy SY7636A Power Management chip driver. Signed-off-by: Alistair Francis <alistair@alistair23.me>rM2-mainline-working-wifi
Alistair Francis
parent
f899726ea6
commit
227a3ee195
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@ -1351,6 +1351,16 @@ config MFD_SYSCON
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Select this option to enable accessing system control registers
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via regmap.
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config MFD_SY7636A
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tristate "Silergy SY7636A Power Management chip driver"
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select MFD_CORE
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select REGMAP_I2C
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select REGMAP_IRQ
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depends on I2C=y
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help
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Select this option to enable support for the Silergy SY7636A
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Power Management chip driver.
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config MFD_DAVINCI_VOICECODEC
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tristate
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select MFD_CORE
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@ -265,6 +265,8 @@ obj-$(CONFIG_MFD_STMFX) += stmfx.o
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obj-$(CONFIG_MFD_KHADAS_MCU) += khadas-mcu.o
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obj-$(CONFIG_MFD_ACER_A500_EC) += acer-ec-a500.o
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obj-$(CONFIG_MFD_SY7636A) += sy7636a.o
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obj-$(CONFIG_SGI_MFD_IOC3) += ioc3.o
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obj-$(CONFIG_MFD_SIMPLE_MFD_I2C) += simple-mfd-i2c.o
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obj-$(CONFIG_MFD_INTEL_M10_BMC) += intel-m10-bmc.o
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@ -0,0 +1,247 @@
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// SPDX-License-Identifier: GPL-2.0+
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//
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// MFD driver for SY7636A chip
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//
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// Copyright (C) 2019 reMarkable AS - http://www.remarkable.com/
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//
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// Authors: Lars Ivar Miljeteig <lars.ivar.miljeteig@remarkable.com>
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// Alistair Francis <alistair@alistair23.me>
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//
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// Based on the lp87565 driver by Keerthy <j-keerthy@ti.com>
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#include <linux/interrupt.h>
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#include <linux/mfd/core.h>
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#include <linux/module.h>
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#include <linux/of_device.h>
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#include <linux/regmap.h>
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#include <linux/sysfs.h>
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#include <linux/mfd/sy7636a.h>
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static const struct regmap_config sy7636a_regmap_config = {
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.reg_bits = 8,
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.val_bits = 8,
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};
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static const struct mfd_cell sy7636a_cells[] = {
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{ .name = "sy7636a-regulator", },
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{ .name = "sy7636a-temperature", },
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{ .name = "sy7636a-thermal", },
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};
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static const struct of_device_id of_sy7636a_match_table[] = {
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{ .compatible = "silergy,sy7636a", },
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{}
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};
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MODULE_DEVICE_TABLE(of, of_sy7636a_match_table);
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static const char * const states[] = {
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"no fault event",
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"UVP at VP rail",
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"UVP at VN rail",
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"UVP at VPOS rail",
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"UVP at VNEG rail",
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"UVP at VDDH rail",
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"UVP at VEE rail",
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"SCP at VP rail",
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"SCP at VN rail",
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"SCP at VPOS rail",
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"SCP at VNEG rail",
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"SCP at VDDH rail",
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"SCP at VEE rail",
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"SCP at V COM rail",
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"UVLO",
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"Thermal shutdown",
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};
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static int sy7636a_get_vcom_voltage_mv(struct regmap *regmap)
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{
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int ret;
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unsigned int val, val_h;
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ret = regmap_read(regmap, SY7636A_REG_VCOM_ADJUST_CTRL_L, &val);
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if (ret)
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return ret;
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ret = regmap_read(regmap, SY7636A_REG_VCOM_ADJUST_CTRL_H, &val_h);
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if (ret)
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return ret;
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val |= (val_h << 8);
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return (val & 0x1FF) * 10;
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}
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static int sy7636a_set_vcom_voltage_mv(struct regmap *regmap, unsigned int vcom)
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{
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int ret;
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unsigned int val;
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if (vcom < 0 || vcom > 5000)
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return -EINVAL;
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val = (unsigned int)(vcom / 10) & 0x1ff;
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ret = regmap_write(regmap, SY7636A_REG_VCOM_ADJUST_CTRL_L, val);
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if (ret)
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return ret;
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ret = regmap_write(regmap, SY7636A_REG_VCOM_ADJUST_CTRL_H, val >> 8);
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if (ret)
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return ret;
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return 0;
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}
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static ssize_t state_show(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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int ret;
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unsigned int val;
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struct sy7636a *sy7636a = dev_get_drvdata(dev);
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ret = regmap_read(sy7636a->regmap, SY7636A_REG_FAULT_FLAG, &val);
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if (ret) {
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dev_err(sy7636a->dev, "Failed to read from device\n");
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return ret;
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}
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val = val >> 1;
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if (val >= ARRAY_SIZE(states)) {
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dev_err(sy7636a->dev, "Unexpected value read from device: %u\n", val);
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return -EINVAL;
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}
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return snprintf(buf, PAGE_SIZE, "%s\n", states[val]);
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}
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static DEVICE_ATTR(state, 0444, state_show, NULL);
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static ssize_t power_good_show(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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int ret;
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unsigned int val;
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struct sy7636a *sy7636a = dev_get_drvdata(dev);
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ret = regmap_read(sy7636a->regmap, SY7636A_REG_FAULT_FLAG, &val);
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if (ret) {
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dev_err(sy7636a->dev, "Failed to read from device\n");
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return ret;
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}
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val &= 0x01;
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return snprintf(buf, PAGE_SIZE, "%s\n", val ? "ON" : "OFF");
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}
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static DEVICE_ATTR(power_good, 0444, power_good_show, NULL);
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static ssize_t vcom_show(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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int ret;
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struct sy7636a *sy7636a = dev_get_drvdata(dev);
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ret = sy7636a_get_vcom_voltage_mv(sy7636a->regmap);
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if (ret < 0)
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return ret;
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return snprintf(buf, PAGE_SIZE, "%d\n", -ret);
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}
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static ssize_t vcom_store(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t count)
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{
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int ret;
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int vcom;
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struct sy7636a *sy7636a = dev_get_drvdata(dev);
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ret = kstrtoint(buf, 0, &vcom);
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if (ret)
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return ret;
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if (vcom > 0 || vcom < -5000)
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return -EINVAL;
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ret = sy7636a_set_vcom_voltage_mv(sy7636a->regmap, (unsigned int)(-vcom));
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if (ret)
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return ret;
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return count;
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}
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static DEVICE_ATTR(vcom, 0644, vcom_show, vcom_store);
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static struct attribute *sy7636a_sysfs_attrs[] = {
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&dev_attr_state.attr,
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&dev_attr_power_good.attr,
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&dev_attr_vcom.attr,
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NULL,
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};
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static const struct attribute_group sy7636a_sysfs_attr_group = {
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.attrs = sy7636a_sysfs_attrs,
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};
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static int sy7636a_probe(struct i2c_client *client,
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const struct i2c_device_id *ids)
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{
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struct sy7636a *sy7636a;
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int ret;
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sy7636a = devm_kzalloc(&client->dev, sizeof(struct sy7636a), GFP_KERNEL);
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if (sy7636a == NULL)
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return -ENOMEM;
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sy7636a->dev = &client->dev;
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sy7636a->regmap = devm_regmap_init_i2c(client, &sy7636a_regmap_config);
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if (IS_ERR(sy7636a->regmap)) {
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ret = PTR_ERR(sy7636a->regmap);
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dev_err(sy7636a->dev,
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"Failed to initialize register map: %d\n", ret);
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return ret;
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}
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i2c_set_clientdata(client, sy7636a);
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ret = sysfs_create_group(&client->dev.kobj, &sy7636a_sysfs_attr_group);
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if (ret) {
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dev_err(sy7636a->dev, "Failed to create sysfs attributes\n");
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return ret;
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}
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ret = devm_mfd_add_devices(sy7636a->dev, PLATFORM_DEVID_AUTO,
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sy7636a_cells, ARRAY_SIZE(sy7636a_cells),
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NULL, 0, NULL);
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if (ret) {
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dev_err(sy7636a->dev, "Failed to add mfd devices\n");
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sysfs_remove_group(&client->dev.kobj, &sy7636a_sysfs_attr_group);
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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 sy7636a_id_table[] = {
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{ "sy7636a", 0 },
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{ },
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};
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MODULE_DEVICE_TABLE(i2c, sy7636a_id_table);
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static struct i2c_driver sy7636a_driver = {
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.driver = {
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.name = "sy7636a",
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.of_match_table = of_sy7636a_match_table,
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},
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.probe = sy7636a_probe,
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.id_table = sy7636a_id_table,
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};
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module_i2c_driver(sy7636a_driver);
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MODULE_AUTHOR("Lars Ivar Miljeteig <lars.ivar.miljeteig@remarkable.com>");
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MODULE_DESCRIPTION("Silergy SY7636A Multi-Function Device Driver");
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MODULE_LICENSE("GPL v2");
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@ -0,0 +1,46 @@
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/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Functions to access SY3686A power management chip.
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*
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* Copyright (C) 2019 reMarkable AS - http://www.remarkable.com/
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation version 2.
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*
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* This program is distributed "as is" WITHOUT ANY WARRANTY of any
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* kind, whether express or implied; without even the implied warranty
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* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#ifndef __LINUX_MFD_SY7636A_H
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#define __LINUX_MFD_SY7636A_H
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#include <linux/i2c.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/regmap.h>
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#define SY7636A_REG_OPERATION_MODE_CRL 0x00
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#define SY7636A_OPERATION_MODE_CRL_VCOMCTL (1 << 6)
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#define SY7636A_OPERATION_MODE_CRL_ONOFF (1 << 7)
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#define SY7636A_REG_VCOM_ADJUST_CTRL_L 0x01
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#define SY7636A_REG_VCOM_ADJUST_CTRL_H 0x02
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#define SY7636A_REG_VCOM_ADJUST_CTRL_MASK 0x01ff
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#define SY7636A_REG_VLDO_VOLTAGE_ADJULST_CTRL 0x03
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#define SY7636A_REG_POWER_ON_DELAY_TIME 0x06
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#define SY7636A_REG_FAULT_FLAG 0x07
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#define SY7636A_FAULT_FLAG_PG (1 << 0)
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#define SY7636A_REG_TERMISTOR_READOUT 0x08
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#define SY7636A_REG_MAX 0x08
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struct sy7636a {
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struct device *dev;
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struct regmap *regmap;
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int vcom;
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struct gpio_desc *pgood_gpio;
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};
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#endif /* __LINUX_MFD_SY7636A_H */
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