diff options
Diffstat (limited to 'drivers/regulator/max8925-regulator.c')
| -rw-r--r-- | drivers/regulator/max8925-regulator.c | 346 |
1 files changed, 346 insertions, 0 deletions
diff --git a/drivers/regulator/max8925-regulator.c b/drivers/regulator/max8925-regulator.c new file mode 100644 index 000000000..39b63ddef --- /dev/null +++ b/drivers/regulator/max8925-regulator.c @@ -0,0 +1,346 @@ +/* + * Regulators driver for Maxim max8925 + * + * Copyright (C) 2009 Marvell International Ltd. + * Haojian Zhuang <haojian.zhuang@marvell.com> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/init.h> +#include <linux/err.h> +#include <linux/i2c.h> +#include <linux/platform_device.h> +#include <linux/regulator/driver.h> +#include <linux/regulator/machine.h> +#include <linux/mfd/max8925.h> +#include <linux/of.h> +#include <linux/regulator/of_regulator.h> + +#define SD1_DVM_VMIN 850000 +#define SD1_DVM_VMAX 1000000 +#define SD1_DVM_STEP 50000 +#define SD1_DVM_SHIFT 5 /* SDCTL1 bit5 */ +#define SD1_DVM_EN 6 /* SDV1 bit 6 */ + +/* bit definitions in LDO control registers */ +#define LDO_SEQ_I2C 0x7 /* Power U/D by i2c */ +#define LDO_SEQ_MASK 0x7 /* Power U/D sequence mask */ +#define LDO_SEQ_SHIFT 2 /* Power U/D sequence offset */ +#define LDO_I2C_EN 0x1 /* Enable by i2c */ +#define LDO_I2C_EN_MASK 0x1 /* Enable mask by i2c */ +#define LDO_I2C_EN_SHIFT 0 /* Enable offset by i2c */ + +struct max8925_regulator_info { + struct regulator_desc desc; + struct i2c_client *i2c; + + int vol_reg; + int enable_reg; +}; + +static int max8925_set_voltage_sel(struct regulator_dev *rdev, + unsigned int selector) +{ + struct max8925_regulator_info *info = rdev_get_drvdata(rdev); + unsigned char mask = rdev->desc->n_voltages - 1; + + return max8925_set_bits(info->i2c, info->vol_reg, mask, selector); +} + +static int max8925_get_voltage_sel(struct regulator_dev *rdev) +{ + struct max8925_regulator_info *info = rdev_get_drvdata(rdev); + unsigned char data, mask; + int ret; + + ret = max8925_reg_read(info->i2c, info->vol_reg); + if (ret < 0) + return ret; + mask = rdev->desc->n_voltages - 1; + data = ret & mask; + + return data; +} + +static int max8925_enable(struct regulator_dev *rdev) +{ + struct max8925_regulator_info *info = rdev_get_drvdata(rdev); + + return max8925_set_bits(info->i2c, info->enable_reg, + LDO_SEQ_MASK << LDO_SEQ_SHIFT | + LDO_I2C_EN_MASK << LDO_I2C_EN_SHIFT, + LDO_SEQ_I2C << LDO_SEQ_SHIFT | + LDO_I2C_EN << LDO_I2C_EN_SHIFT); +} + +static int max8925_disable(struct regulator_dev *rdev) +{ + struct max8925_regulator_info *info = rdev_get_drvdata(rdev); + + return max8925_set_bits(info->i2c, info->enable_reg, + LDO_SEQ_MASK << LDO_SEQ_SHIFT | + LDO_I2C_EN_MASK << LDO_I2C_EN_SHIFT, + LDO_SEQ_I2C << LDO_SEQ_SHIFT); +} + +static int max8925_is_enabled(struct regulator_dev *rdev) +{ + struct max8925_regulator_info *info = rdev_get_drvdata(rdev); + int ldo_seq, ret; + + ret = max8925_reg_read(info->i2c, info->enable_reg); + if (ret < 0) + return ret; + ldo_seq = (ret >> LDO_SEQ_SHIFT) & LDO_SEQ_MASK; + if (ldo_seq != LDO_SEQ_I2C) + return 1; + else + return ret & (LDO_I2C_EN_MASK << LDO_I2C_EN_SHIFT); +} + +static int max8925_set_dvm_voltage(struct regulator_dev *rdev, int uV) +{ + struct max8925_regulator_info *info = rdev_get_drvdata(rdev); + unsigned char data, mask; + + if (uV < SD1_DVM_VMIN || uV > SD1_DVM_VMAX) + return -EINVAL; + + data = DIV_ROUND_UP(uV - SD1_DVM_VMIN, SD1_DVM_STEP); + data <<= SD1_DVM_SHIFT; + mask = 3 << SD1_DVM_SHIFT; + + return max8925_set_bits(info->i2c, info->enable_reg, mask, data); +} + +static int max8925_set_dvm_enable(struct regulator_dev *rdev) +{ + struct max8925_regulator_info *info = rdev_get_drvdata(rdev); + + return max8925_set_bits(info->i2c, info->vol_reg, 1 << SD1_DVM_EN, + 1 << SD1_DVM_EN); +} + +static int max8925_set_dvm_disable(struct regulator_dev *rdev) +{ + struct max8925_regulator_info *info = rdev_get_drvdata(rdev); + + return max8925_set_bits(info->i2c, info->vol_reg, 1 << SD1_DVM_EN, 0); +} + +static const struct regulator_ops max8925_regulator_sdv_ops = { + .map_voltage = regulator_map_voltage_linear, + .list_voltage = regulator_list_voltage_linear, + .set_voltage_sel = max8925_set_voltage_sel, + .get_voltage_sel = max8925_get_voltage_sel, + .enable = max8925_enable, + .disable = max8925_disable, + .is_enabled = max8925_is_enabled, + .set_suspend_voltage = max8925_set_dvm_voltage, + .set_suspend_enable = max8925_set_dvm_enable, + .set_suspend_disable = max8925_set_dvm_disable, +}; + +static const struct regulator_ops max8925_regulator_ldo_ops = { + .map_voltage = regulator_map_voltage_linear, + .list_voltage = regulator_list_voltage_linear, + .set_voltage_sel = max8925_set_voltage_sel, + .get_voltage_sel = max8925_get_voltage_sel, + .enable = max8925_enable, + .disable = max8925_disable, + .is_enabled = max8925_is_enabled, +}; + +#define MAX8925_SDV(_id, min, max, step) \ +{ \ + .desc = { \ + .name = "SDV" #_id, \ + .ops = &max8925_regulator_sdv_ops, \ + .type = REGULATOR_VOLTAGE, \ + .id = MAX8925_ID_SD##_id, \ + .owner = THIS_MODULE, \ + .n_voltages = 64, \ + .min_uV = min * 1000, \ + .uV_step = step * 1000, \ + }, \ + .vol_reg = MAX8925_SDV##_id, \ + .enable_reg = MAX8925_SDCTL##_id, \ +} + +#define MAX8925_LDO(_id, min, max, step) \ +{ \ + .desc = { \ + .name = "LDO" #_id, \ + .ops = &max8925_regulator_ldo_ops, \ + .type = REGULATOR_VOLTAGE, \ + .id = MAX8925_ID_LDO##_id, \ + .owner = THIS_MODULE, \ + .n_voltages = 64, \ + .min_uV = min * 1000, \ + .uV_step = step * 1000, \ + }, \ + .vol_reg = MAX8925_LDOVOUT##_id, \ + .enable_reg = MAX8925_LDOCTL##_id, \ +} + +#ifdef CONFIG_OF +static struct of_regulator_match max8925_regulator_matches[] = { + { .name = "SDV1",}, + { .name = "SDV2",}, + { .name = "SDV3",}, + { .name = "LDO1",}, + { .name = "LDO2",}, + { .name = "LDO3",}, + { .name = "LDO4",}, + { .name = "LDO5",}, + { .name = "LDO6",}, + { .name = "LDO7",}, + { .name = "LDO8",}, + { .name = "LDO9",}, + { .name = "LDO10",}, + { .name = "LDO11",}, + { .name = "LDO12",}, + { .name = "LDO13",}, + { .name = "LDO14",}, + { .name = "LDO15",}, + { .name = "LDO16",}, + { .name = "LDO17",}, + { .name = "LDO18",}, + { .name = "LDO19",}, + { .name = "LDO20",}, +}; +#endif + +static struct max8925_regulator_info max8925_regulator_info[] = { + MAX8925_SDV(1, 637.5, 1425, 12.5), + MAX8925_SDV(2, 650, 2225, 25), + MAX8925_SDV(3, 750, 3900, 50), + + MAX8925_LDO(1, 750, 3900, 50), + MAX8925_LDO(2, 650, 2250, 25), + MAX8925_LDO(3, 650, 2250, 25), + MAX8925_LDO(4, 750, 3900, 50), + MAX8925_LDO(5, 750, 3900, 50), + MAX8925_LDO(6, 750, 3900, 50), + MAX8925_LDO(7, 750, 3900, 50), + MAX8925_LDO(8, 750, 3900, 50), + MAX8925_LDO(9, 750, 3900, 50), + MAX8925_LDO(10, 750, 3900, 50), + MAX8925_LDO(11, 750, 3900, 50), + MAX8925_LDO(12, 750, 3900, 50), + MAX8925_LDO(13, 750, 3900, 50), + MAX8925_LDO(14, 750, 3900, 50), + MAX8925_LDO(15, 750, 3900, 50), + MAX8925_LDO(16, 750, 3900, 50), + MAX8925_LDO(17, 650, 2250, 25), + MAX8925_LDO(18, 650, 2250, 25), + MAX8925_LDO(19, 750, 3900, 50), + MAX8925_LDO(20, 750, 3900, 50), +}; + +#ifdef CONFIG_OF +static int max8925_regulator_dt_init(struct platform_device *pdev, + struct regulator_config *config, + int ridx) +{ + struct device_node *nproot, *np; + int rcount; + + nproot = pdev->dev.parent->of_node; + if (!nproot) + return -ENODEV; + np = of_get_child_by_name(nproot, "regulators"); + if (!np) { + dev_err(&pdev->dev, "failed to find regulators node\n"); + return -ENODEV; + } + + rcount = of_regulator_match(&pdev->dev, np, + &max8925_regulator_matches[ridx], 1); + of_node_put(np); + if (rcount < 0) + return rcount; + config->init_data = max8925_regulator_matches[ridx].init_data; + config->of_node = max8925_regulator_matches[ridx].of_node; + + return 0; +} +#else +#define max8925_regulator_dt_init(x, y, z) (-1) +#endif + +static int max8925_regulator_probe(struct platform_device *pdev) +{ + struct max8925_chip *chip = dev_get_drvdata(pdev->dev.parent); + struct regulator_init_data *pdata = dev_get_platdata(&pdev->dev); + struct regulator_config config = { }; + struct max8925_regulator_info *ri; + struct resource *res; + struct regulator_dev *rdev; + int i, regulator_idx; + + res = platform_get_resource(pdev, IORESOURCE_REG, 0); + if (!res) { + dev_err(&pdev->dev, "No REG resource!\n"); + return -EINVAL; + } + for (i = 0; i < ARRAY_SIZE(max8925_regulator_info); i++) { + ri = &max8925_regulator_info[i]; + if (ri->vol_reg == res->start) { + regulator_idx = i; + break; + } + } + + if (i == ARRAY_SIZE(max8925_regulator_info)) { + dev_err(&pdev->dev, "Failed to find regulator %llu\n", + (unsigned long long)res->start); + return -EINVAL; + } + ri->i2c = chip->i2c; + + config.dev = &pdev->dev; + config.driver_data = ri; + + if (max8925_regulator_dt_init(pdev, &config, regulator_idx)) + if (pdata) + config.init_data = pdata; + + rdev = devm_regulator_register(&pdev->dev, &ri->desc, &config); + if (IS_ERR(rdev)) { + dev_err(&pdev->dev, "failed to register regulator %s\n", + ri->desc.name); + return PTR_ERR(rdev); + } + + platform_set_drvdata(pdev, rdev); + return 0; +} + +static struct platform_driver max8925_regulator_driver = { + .driver = { + .name = "max8925-regulator", + }, + .probe = max8925_regulator_probe, +}; + +static int __init max8925_regulator_init(void) +{ + return platform_driver_register(&max8925_regulator_driver); +} +subsys_initcall(max8925_regulator_init); + +static void __exit max8925_regulator_exit(void) +{ + platform_driver_unregister(&max8925_regulator_driver); +} +module_exit(max8925_regulator_exit); + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>"); +MODULE_DESCRIPTION("Regulator Driver for Maxim 8925 PMIC"); +MODULE_ALIAS("platform:max8925-regulator"); |