| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| Ivaylo Ivanov | 646 | 100.00% | 1 | 100.00% |
| Total | 646 | 1 |
// SPDX-License-Identifier: GPL-2.0-or-later // // regulator driver for Maxim MAX77838 // // based on max77826-regulator.c // // Copyright (c) 2025, Ivaylo Ivanov <ivo.ivanov.ivanov1@gmail.com> #include <linux/kernel.h> #include <linux/module.h> #include <linux/init.h> #include <linux/err.h> #include <linux/of.h> #include <linux/platform_device.h> #include <linux/regulator/driver.h> #include <linux/regulator/of_regulator.h> #include <linux/i2c.h> #include <linux/regmap.h> enum max77838_registers { MAX77838_REG_DEVICE_ID = 0x00, MAX77838_REG_TOPSYS_STAT, MAX77838_REG_STAT, MAX77838_REG_EN, MAX77838_REG_GPIO_PD_CTRL, MAX77838_REG_UVLO_CFG1, /* 0x06 - 0x0B: reserved */ MAX77838_REG_I2C_CFG = 0x0C, /* 0x0D - 0x0F: reserved */ MAX77838_REG_LDO1_CFG = 0x10, MAX77838_REG_LDO2_CFG, MAX77838_REG_LDO3_CFG, MAX77838_REG_LDO4_CFG, /* 0x14 - 0x1F: reserved */ MAX77838_REG_BUCK_CFG1 = 0x20, MAX77838_REG_BUCK_VOUT, }; enum max77838_regulators { MAX77838_LDO1 = 0, MAX77838_LDO2, MAX77838_LDO3, MAX77838_LDO4, MAX77838_BUCK, MAX77838_MAX_REGULATORS, }; #define MAX77838_MASK_LDO 0x7f #define MAX77838_MASK_BUCK 0xff #define MAX77838_LDO1_EN BIT(0) #define MAX77838_LDO2_EN BIT(1) #define MAX77838_LDO3_EN BIT(2) #define MAX77838_LDO4_EN BIT(3) #define MAX77838_BUCK_EN BIT(4) #define MAX77838_BUCK_AD BIT(3) #define MAX77838_LDO_AD BIT(7) #define MAX77838_LDO_VOLT_MIN 600000 #define MAX77838_LDO_VOLT_MAX 3775000 #define MAX77838_LDO_VOLT_STEP 25000 #define MAX77838_BUCK_VOLT_MIN 500000 #define MAX77838_BUCK_VOLT_MAX 2093750 #define MAX77838_BUCK_VOLT_STEP 6250 #define MAX77838_VOLT_RANGE(_type) \ ((MAX77838_ ## _type ## _VOLT_MAX - \ MAX77838_ ## _type ## _VOLT_MIN) / \ MAX77838_ ## _type ## _VOLT_STEP + 1) #define MAX77838_LDO(_id) \ [MAX77838_LDO ## _id] = { \ .id = MAX77838_LDO ## _id, \ .name = "ldo"#_id, \ .of_match = of_match_ptr("ldo"#_id), \ .regulators_node = "regulators", \ .ops = &max77838_regulator_ops, \ .min_uV = MAX77838_LDO_VOLT_MIN, \ .uV_step = MAX77838_LDO_VOLT_STEP, \ .n_voltages = MAX77838_VOLT_RANGE(LDO), \ .enable_reg = MAX77838_REG_EN, \ .enable_mask = MAX77838_LDO ## _id ## _EN, \ .vsel_reg = MAX77838_REG_LDO ## _id ## _CFG, \ .vsel_mask = MAX77838_MASK_LDO, \ .active_discharge_off = 0, \ .active_discharge_on = MAX77838_LDO_AD, \ .active_discharge_mask = MAX77838_LDO_AD, \ .active_discharge_reg = MAX77838_REG_LDO ## _id ## _CFG, \ .owner = THIS_MODULE, \ } #define MAX77838_BUCK_DESC \ [MAX77838_BUCK] = { \ .id = MAX77838_BUCK, \ .name = "buck", \ .of_match = of_match_ptr("buck"), \ .regulators_node = "regulators", \ .ops = &max77838_regulator_ops, \ .min_uV = MAX77838_BUCK_VOLT_MIN, \ .uV_step = MAX77838_BUCK_VOLT_STEP, \ .n_voltages = MAX77838_VOLT_RANGE(BUCK), \ .enable_reg = MAX77838_REG_EN, \ .enable_mask = MAX77838_BUCK_EN, \ .vsel_reg = MAX77838_REG_BUCK_VOUT, \ .vsel_mask = MAX77838_MASK_BUCK, \ .active_discharge_off = 0, \ .active_discharge_on = MAX77838_BUCK_AD, \ .active_discharge_mask = MAX77838_BUCK_AD, \ .active_discharge_reg = MAX77838_REG_BUCK_CFG1, \ .owner = THIS_MODULE, \ } struct max77838_regulator_info { struct regmap *regmap; }; static const struct regmap_config max77838_regmap_config = { .reg_bits = 8, .val_bits = 8, .max_register = MAX77838_REG_BUCK_VOUT, }; static const struct regulator_ops max77838_regulator_ops = { .enable = regulator_enable_regmap, .disable = regulator_disable_regmap, .is_enabled = regulator_is_enabled_regmap, .list_voltage = regulator_list_voltage_linear, .map_voltage = regulator_map_voltage_linear, .get_voltage_sel = regulator_get_voltage_sel_regmap, .set_voltage_sel = regulator_set_voltage_sel_regmap, .set_active_discharge = regulator_set_active_discharge_regmap, }; static const struct regulator_desc max77838_regulators_desc[] = { MAX77838_LDO(1), MAX77838_LDO(2), MAX77838_LDO(3), MAX77838_LDO(4), MAX77838_BUCK_DESC, }; static int max77838_read_device_id(struct regmap *regmap, struct device *dev) { unsigned int device_id; int ret; ret = regmap_read(regmap, MAX77838_REG_DEVICE_ID, &device_id); if (!ret) dev_dbg(dev, "DEVICE_ID: 0x%x\n", device_id); return ret; } static int max77838_i2c_probe(struct i2c_client *client) { struct device *dev = &client->dev; struct max77838_regulator_info *info; struct regulator_config config = {}; struct regulator_dev *rdev; struct regmap *regmap; int i; info = devm_kzalloc(dev, sizeof(struct max77838_regulator_info), GFP_KERNEL); if (!info) return -ENOMEM; regmap = devm_regmap_init_i2c(client, &max77838_regmap_config); if (IS_ERR(regmap)) { dev_err(dev, "Failed to allocate regmap!\n"); return PTR_ERR(regmap); } info->regmap = regmap; i2c_set_clientdata(client, info); config.dev = dev; config.regmap = regmap; config.driver_data = info; for (i = 0; i < MAX77838_MAX_REGULATORS; i++) { rdev = devm_regulator_register(dev, &max77838_regulators_desc[i], &config); if (IS_ERR(rdev)) { dev_err(dev, "Failed to register regulator!\n"); return PTR_ERR(rdev); } } return max77838_read_device_id(regmap, dev); } static const struct of_device_id __maybe_unused max77838_of_match[] = { { .compatible = "maxim,max77838" }, { /* sentinel */ } }; MODULE_DEVICE_TABLE(of, max77838_of_match); static const struct i2c_device_id max77838_id[] = { { "max77838-regulator" }, { /* sentinel */ } }; MODULE_DEVICE_TABLE(i2c, max77838_id); static struct i2c_driver max77838_regulator_driver = { .driver = { .name = "max77838", .probe_type = PROBE_PREFER_ASYNCHRONOUS, .of_match_table = of_match_ptr(max77838_of_match), }, .probe = max77838_i2c_probe, .id_table = max77838_id, }; module_i2c_driver(max77838_regulator_driver); MODULE_AUTHOR("Ivaylo Ivanov <ivo.ivanov.ivanov1@gmail.com>"); MODULE_DESCRIPTION("MAX77838 PMIC regulator driver"); MODULE_LICENSE("GPL");
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