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339 lines
8.8 KiB
339 lines
8.8 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* max8952.c - Voltage and current regulation for the Maxim 8952 |
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* |
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* Copyright (C) 2010 Samsung Electronics |
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* MyungJoo Ham <[email protected]> |
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*/ |
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#include <linux/module.h> |
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#include <linux/init.h> |
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#include <linux/i2c.h> |
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#include <linux/err.h> |
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#include <linux/platform_device.h> |
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#include <linux/regulator/driver.h> |
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#include <linux/regulator/max8952.h> |
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#include <linux/gpio/consumer.h> |
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#include <linux/io.h> |
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#include <linux/of.h> |
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#include <linux/regulator/of_regulator.h> |
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#include <linux/slab.h> |
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/* Registers */ |
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enum { |
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MAX8952_REG_MODE0, |
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MAX8952_REG_MODE1, |
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MAX8952_REG_MODE2, |
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MAX8952_REG_MODE3, |
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MAX8952_REG_CONTROL, |
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MAX8952_REG_SYNC, |
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MAX8952_REG_RAMP, |
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MAX8952_REG_CHIP_ID1, |
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MAX8952_REG_CHIP_ID2, |
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}; |
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struct max8952_data { |
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struct i2c_client *client; |
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struct max8952_platform_data *pdata; |
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struct gpio_desc *vid0_gpiod; |
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struct gpio_desc *vid1_gpiod; |
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bool vid0; |
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bool vid1; |
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}; |
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static int max8952_read_reg(struct max8952_data *max8952, u8 reg) |
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{ |
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int ret = i2c_smbus_read_byte_data(max8952->client, reg); |
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if (ret > 0) |
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ret &= 0xff; |
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return ret; |
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} |
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static int max8952_write_reg(struct max8952_data *max8952, |
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u8 reg, u8 value) |
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{ |
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return i2c_smbus_write_byte_data(max8952->client, reg, value); |
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} |
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static int max8952_list_voltage(struct regulator_dev *rdev, |
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unsigned int selector) |
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{ |
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struct max8952_data *max8952 = rdev_get_drvdata(rdev); |
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if (rdev_get_id(rdev) != 0) |
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return -EINVAL; |
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return (max8952->pdata->dvs_mode[selector] * 10 + 770) * 1000; |
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} |
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static int max8952_get_voltage_sel(struct regulator_dev *rdev) |
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{ |
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struct max8952_data *max8952 = rdev_get_drvdata(rdev); |
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u8 vid = 0; |
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if (max8952->vid0) |
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vid += 1; |
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if (max8952->vid1) |
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vid += 2; |
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return vid; |
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} |
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static int max8952_set_voltage_sel(struct regulator_dev *rdev, |
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unsigned selector) |
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{ |
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struct max8952_data *max8952 = rdev_get_drvdata(rdev); |
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if (!max8952->vid0_gpiod || !max8952->vid1_gpiod) { |
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/* DVS not supported */ |
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return -EPERM; |
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} |
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max8952->vid0 = selector & 0x1; |
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max8952->vid1 = (selector >> 1) & 0x1; |
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gpiod_set_value(max8952->vid0_gpiod, max8952->vid0); |
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gpiod_set_value(max8952->vid1_gpiod, max8952->vid1); |
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return 0; |
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} |
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static const struct regulator_ops max8952_ops = { |
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.list_voltage = max8952_list_voltage, |
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.get_voltage_sel = max8952_get_voltage_sel, |
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.set_voltage_sel = max8952_set_voltage_sel, |
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}; |
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static const struct regulator_desc regulator = { |
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.name = "MAX8952_VOUT", |
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.id = 0, |
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.n_voltages = MAX8952_NUM_DVS_MODE, |
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.ops = &max8952_ops, |
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.type = REGULATOR_VOLTAGE, |
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.owner = THIS_MODULE, |
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}; |
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#ifdef CONFIG_OF |
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static const struct of_device_id max8952_dt_match[] = { |
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{ .compatible = "maxim,max8952" }, |
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{}, |
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}; |
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MODULE_DEVICE_TABLE(of, max8952_dt_match); |
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static struct max8952_platform_data *max8952_parse_dt(struct device *dev) |
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{ |
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struct max8952_platform_data *pd; |
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struct device_node *np = dev->of_node; |
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int ret; |
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int i; |
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pd = devm_kzalloc(dev, sizeof(*pd), GFP_KERNEL); |
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if (!pd) |
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return NULL; |
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if (of_property_read_u32(np, "max8952,default-mode", &pd->default_mode)) |
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dev_warn(dev, "Default mode not specified, assuming 0\n"); |
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ret = of_property_read_u32_array(np, "max8952,dvs-mode-microvolt", |
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pd->dvs_mode, ARRAY_SIZE(pd->dvs_mode)); |
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if (ret) { |
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dev_err(dev, "max8952,dvs-mode-microvolt property not specified"); |
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return NULL; |
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} |
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for (i = 0; i < ARRAY_SIZE(pd->dvs_mode); ++i) { |
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if (pd->dvs_mode[i] < 770000 || pd->dvs_mode[i] > 1400000) { |
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dev_err(dev, "DVS voltage %d out of range\n", i); |
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return NULL; |
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} |
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pd->dvs_mode[i] = (pd->dvs_mode[i] - 770000) / 10000; |
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} |
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if (of_property_read_u32(np, "max8952,sync-freq", &pd->sync_freq)) |
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dev_warn(dev, "max8952,sync-freq property not specified, defaulting to 26MHz\n"); |
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if (of_property_read_u32(np, "max8952,ramp-speed", &pd->ramp_speed)) |
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dev_warn(dev, "max8952,ramp-speed property not specified, defaulting to 32mV/us\n"); |
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pd->reg_data = of_get_regulator_init_data(dev, np, ®ulator); |
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if (!pd->reg_data) { |
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dev_err(dev, "Failed to parse regulator init data\n"); |
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return NULL; |
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} |
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return pd; |
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} |
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#else |
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static struct max8952_platform_data *max8952_parse_dt(struct device *dev) |
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{ |
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return NULL; |
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} |
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#endif |
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static int max8952_pmic_probe(struct i2c_client *client, |
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const struct i2c_device_id *i2c_id) |
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{ |
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struct i2c_adapter *adapter = client->adapter; |
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struct max8952_platform_data *pdata = dev_get_platdata(&client->dev); |
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struct regulator_config config = { }; |
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struct max8952_data *max8952; |
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struct regulator_dev *rdev; |
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struct gpio_desc *gpiod; |
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enum gpiod_flags gflags; |
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int ret = 0; |
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if (client->dev.of_node) |
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pdata = max8952_parse_dt(&client->dev); |
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if (!pdata) { |
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dev_err(&client->dev, "Require the platform data\n"); |
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return -EINVAL; |
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} |
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if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE)) |
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return -EIO; |
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max8952 = devm_kzalloc(&client->dev, sizeof(struct max8952_data), |
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GFP_KERNEL); |
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if (!max8952) |
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return -ENOMEM; |
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max8952->client = client; |
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max8952->pdata = pdata; |
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config.dev = &client->dev; |
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config.init_data = pdata->reg_data; |
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config.driver_data = max8952; |
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config.of_node = client->dev.of_node; |
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if (pdata->reg_data->constraints.boot_on) |
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gflags = GPIOD_OUT_HIGH; |
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else |
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gflags = GPIOD_OUT_LOW; |
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gflags |= GPIOD_FLAGS_BIT_NONEXCLUSIVE; |
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/* |
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* Do not use devm* here: the regulator core takes over the |
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* lifecycle management of the GPIO descriptor. |
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*/ |
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gpiod = gpiod_get_optional(&client->dev, |
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"max8952,en", |
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gflags); |
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if (IS_ERR(gpiod)) |
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return PTR_ERR(gpiod); |
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if (gpiod) |
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config.ena_gpiod = gpiod; |
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rdev = devm_regulator_register(&client->dev, ®ulator, &config); |
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if (IS_ERR(rdev)) { |
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ret = PTR_ERR(rdev); |
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dev_err(&client->dev, "regulator init failed (%d)\n", ret); |
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return ret; |
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} |
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max8952->vid0 = pdata->default_mode & 0x1; |
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max8952->vid1 = (pdata->default_mode >> 1) & 0x1; |
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/* Fetch vid0 and vid1 GPIOs if available */ |
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gflags = max8952->vid0 ? GPIOD_OUT_HIGH : GPIOD_OUT_LOW; |
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max8952->vid0_gpiod = devm_gpiod_get_index_optional(&client->dev, |
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"max8952,vid", |
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0, gflags); |
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if (IS_ERR(max8952->vid0_gpiod)) |
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return PTR_ERR(max8952->vid0_gpiod); |
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gflags = max8952->vid1 ? GPIOD_OUT_HIGH : GPIOD_OUT_LOW; |
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max8952->vid1_gpiod = devm_gpiod_get_index_optional(&client->dev, |
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"max8952,vid", |
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1, gflags); |
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if (IS_ERR(max8952->vid1_gpiod)) |
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return PTR_ERR(max8952->vid1_gpiod); |
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/* If either VID GPIO is missing just disable this */ |
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if (!max8952->vid0_gpiod || !max8952->vid1_gpiod) { |
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dev_warn(&client->dev, "VID0/1 gpio invalid: " |
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"DVS not available.\n"); |
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max8952->vid0 = 0; |
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max8952->vid1 = 0; |
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/* Make sure if we have any descriptors they get set to low */ |
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if (max8952->vid0_gpiod) |
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gpiod_set_value(max8952->vid0_gpiod, 0); |
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if (max8952->vid1_gpiod) |
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gpiod_set_value(max8952->vid1_gpiod, 0); |
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/* Disable Pulldown of EN only */ |
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max8952_write_reg(max8952, MAX8952_REG_CONTROL, 0x60); |
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dev_err(&client->dev, "DVS modes disabled because VID0 and VID1" |
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" do not have proper controls.\n"); |
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} else { |
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/* |
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* Disable Pulldown on EN, VID0, VID1 to reduce |
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* leakage current of MAX8952 assuming that MAX8952 |
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* is turned on (EN==1). Note that without having VID0/1 |
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* properly connected, turning pulldown off can be |
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* problematic. Thus, turn this off only when they are |
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* controllable by GPIO. |
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*/ |
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max8952_write_reg(max8952, MAX8952_REG_CONTROL, 0x0); |
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} |
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max8952_write_reg(max8952, MAX8952_REG_MODE0, |
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(max8952_read_reg(max8952, |
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MAX8952_REG_MODE0) & 0xC0) | |
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(pdata->dvs_mode[0] & 0x3F)); |
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max8952_write_reg(max8952, MAX8952_REG_MODE1, |
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(max8952_read_reg(max8952, |
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MAX8952_REG_MODE1) & 0xC0) | |
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(pdata->dvs_mode[1] & 0x3F)); |
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max8952_write_reg(max8952, MAX8952_REG_MODE2, |
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(max8952_read_reg(max8952, |
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MAX8952_REG_MODE2) & 0xC0) | |
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(pdata->dvs_mode[2] & 0x3F)); |
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max8952_write_reg(max8952, MAX8952_REG_MODE3, |
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(max8952_read_reg(max8952, |
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MAX8952_REG_MODE3) & 0xC0) | |
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(pdata->dvs_mode[3] & 0x3F)); |
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max8952_write_reg(max8952, MAX8952_REG_SYNC, |
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(max8952_read_reg(max8952, MAX8952_REG_SYNC) & 0x3F) | |
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((pdata->sync_freq & 0x3) << 6)); |
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max8952_write_reg(max8952, MAX8952_REG_RAMP, |
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(max8952_read_reg(max8952, MAX8952_REG_RAMP) & 0x1F) | |
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((pdata->ramp_speed & 0x7) << 5)); |
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i2c_set_clientdata(client, max8952); |
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return 0; |
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} |
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static const struct i2c_device_id max8952_ids[] = { |
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{ "max8952", 0 }, |
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{ }, |
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}; |
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MODULE_DEVICE_TABLE(i2c, max8952_ids); |
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static struct i2c_driver max8952_pmic_driver = { |
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.probe = max8952_pmic_probe, |
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.driver = { |
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.name = "max8952", |
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.of_match_table = of_match_ptr(max8952_dt_match), |
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}, |
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.id_table = max8952_ids, |
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}; |
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static int __init max8952_pmic_init(void) |
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{ |
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return i2c_add_driver(&max8952_pmic_driver); |
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} |
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subsys_initcall(max8952_pmic_init); |
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static void __exit max8952_pmic_exit(void) |
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{ |
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i2c_del_driver(&max8952_pmic_driver); |
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} |
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module_exit(max8952_pmic_exit); |
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MODULE_DESCRIPTION("MAXIM 8952 voltage regulator driver"); |
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MODULE_AUTHOR("MyungJoo Ham <[email protected]>"); |
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MODULE_LICENSE("GPL");
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