diff options
Diffstat (limited to 'drivers/regulator/max14577.c')
| -rw-r--r-- | drivers/regulator/max14577.c | 275 |
1 files changed, 275 insertions, 0 deletions
diff --git a/drivers/regulator/max14577.c b/drivers/regulator/max14577.c new file mode 100644 index 000000000000..e0619526708c --- /dev/null +++ b/drivers/regulator/max14577.c @@ -0,0 +1,275 @@ +/* + * max14577.c - Regulator driver for the Maxim 14577 + * + * Copyright (C) 2013 Samsung Electronics + * Krzysztof Kozlowski <k.kozlowski@samsung.com> + * + * 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; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + */ + +#include <linux/module.h> +#include <linux/platform_device.h> +#include <linux/regulator/driver.h> +#include <linux/mfd/max14577.h> +#include <linux/mfd/max14577-private.h> +#include <linux/regulator/of_regulator.h> + +struct max14577_regulator { + struct device *dev; + struct max14577 *max14577; + struct regulator_dev **regulators; +}; + +static int max14577_reg_is_enabled(struct regulator_dev *rdev) +{ + int rid = rdev_get_id(rdev); + struct regmap *rmap = rdev->regmap; + u8 reg_data; + + switch (rid) { + case MAX14577_CHARGER: + max14577_read_reg(rmap, MAX14577_CHG_REG_CHG_CTRL2, ®_data); + if ((reg_data & CHGCTRL2_MBCHOSTEN_MASK) == 0) + return 0; + max14577_read_reg(rmap, MAX14577_CHG_REG_STATUS3, ®_data); + if ((reg_data & STATUS3_CGMBC_MASK) == 0) + return 0; + /* MBCHOSTEN and CGMBC are on */ + return 1; + default: + return -EINVAL; + } +} + +static int max14577_reg_get_current_limit(struct regulator_dev *rdev) +{ + u8 reg_data; + struct regmap *rmap = rdev->regmap; + + if (rdev_get_id(rdev) != MAX14577_CHARGER) + return -EINVAL; + + max14577_read_reg(rmap, MAX14577_CHG_REG_CHG_CTRL4, ®_data); + + if ((reg_data & CHGCTRL4_MBCICHWRCL_MASK) == 0) + return MAX14577_REGULATOR_CURRENT_LIMIT_MIN; + + reg_data = ((reg_data & CHGCTRL4_MBCICHWRCH_MASK) >> + CHGCTRL4_MBCICHWRCH_SHIFT); + return MAX14577_REGULATOR_CURRENT_LIMIT_HIGH_START + + reg_data * MAX14577_REGULATOR_CURRENT_LIMIT_HIGH_STEP; +} + +static int max14577_reg_set_current_limit(struct regulator_dev *rdev, + int min_uA, int max_uA) +{ + int i, current_bits = 0xf; + u8 reg_data; + + if (rdev_get_id(rdev) != MAX14577_CHARGER) + return -EINVAL; + + if (min_uA > MAX14577_REGULATOR_CURRENT_LIMIT_MAX || + max_uA < MAX14577_REGULATOR_CURRENT_LIMIT_MIN) + return -EINVAL; + + if (max_uA < MAX14577_REGULATOR_CURRENT_LIMIT_HIGH_START) { + /* Less than 200 mA, so set 90mA (turn only Low Bit off) */ + u8 reg_data = 0x0 << CHGCTRL4_MBCICHWRCL_SHIFT; + return max14577_update_reg(rdev->regmap, + MAX14577_CHG_REG_CHG_CTRL4, + CHGCTRL4_MBCICHWRCL_MASK, reg_data); + } + + /* max_uA is in range: <LIMIT_HIGH_START, inifinite>, so search for + * valid current starting from LIMIT_MAX. */ + for (i = MAX14577_REGULATOR_CURRENT_LIMIT_MAX; + i >= MAX14577_REGULATOR_CURRENT_LIMIT_HIGH_START; + i -= MAX14577_REGULATOR_CURRENT_LIMIT_HIGH_STEP) { + if (i <= max_uA) + break; + current_bits--; + } + BUG_ON(current_bits < 0); /* Cannot happen */ + /* Turn Low Bit on (use range 200mA-950 mA) */ + reg_data = 0x1 << CHGCTRL4_MBCICHWRCL_SHIFT; + /* and set proper High Bits */ + reg_data |= current_bits << CHGCTRL4_MBCICHWRCH_SHIFT; + + return max14577_update_reg(rdev->regmap, MAX14577_CHG_REG_CHG_CTRL4, + CHGCTRL4_MBCICHWRCL_MASK | CHGCTRL4_MBCICHWRCH_MASK, + reg_data); +} + +static struct regulator_ops max14577_safeout_ops = { + .is_enabled = regulator_is_enabled_regmap, + .enable = regulator_enable_regmap, + .disable = regulator_disable_regmap, + .list_voltage = regulator_list_voltage_linear, +}; + +static struct regulator_ops max14577_charger_ops = { + .is_enabled = max14577_reg_is_enabled, + .enable = regulator_enable_regmap, + .disable = regulator_disable_regmap, + .get_current_limit = max14577_reg_get_current_limit, + .set_current_limit = max14577_reg_set_current_limit, +}; + +static const struct regulator_desc supported_regulators[] = { + [MAX14577_SAFEOUT] = { + .name = "SAFEOUT", + .id = MAX14577_SAFEOUT, + .ops = &max14577_safeout_ops, + .type = REGULATOR_VOLTAGE, + .owner = THIS_MODULE, + .n_voltages = 1, + .min_uV = MAX14577_REGULATOR_SAFEOUT_VOLTAGE, + .enable_reg = MAX14577_REG_CONTROL2, + .enable_mask = CTRL2_SFOUTORD_MASK, + }, + [MAX14577_CHARGER] = { + .name = "CHARGER", + .id = MAX14577_CHARGER, + .ops = &max14577_charger_ops, + .type = REGULATOR_CURRENT, + .owner = THIS_MODULE, + .enable_reg = MAX14577_CHG_REG_CHG_CTRL2, + .enable_mask = CHGCTRL2_MBCHOSTEN_MASK, + }, +}; + +#ifdef CONFIG_OF +static struct of_regulator_match max14577_regulator_matches[] = { + { .name = "SAFEOUT", }, + { .name = "CHARGER", }, +}; + +static int max14577_regulator_dt_parse_pdata(struct platform_device *pdev) +{ + int ret; + struct device_node *np; + + np = of_get_child_by_name(pdev->dev.parent->of_node, "regulators"); + if (!np) { + dev_err(&pdev->dev, "Failed to get child OF node for regulators\n"); + return -EINVAL; + } + + ret = of_regulator_match(&pdev->dev, np, max14577_regulator_matches, + MAX14577_REG_MAX); + if (ret < 0) + dev_err(&pdev->dev, "Error parsing regulator init data: %d\n", ret); + else + ret = 0; + + of_node_put(np); + + return ret; +} + +static inline struct regulator_init_data *match_init_data(int index) +{ + return max14577_regulator_matches[index].init_data; +} + +static inline struct device_node *match_of_node(int index) +{ + return max14577_regulator_matches[index].of_node; +} +#else /* CONFIG_OF */ +static int max14577_regulator_dt_parse_pdata(struct platform_device *pdev) +{ + return 0; +} +static inline struct regulator_init_data *match_init_data(int index) +{ + return NULL; +} + +static inline struct device_node *match_of_node(int index) +{ + return NULL; +} +#endif /* CONFIG_OF */ + + +static int max14577_regulator_probe(struct platform_device *pdev) +{ + struct max14577 *max14577 = dev_get_drvdata(pdev->dev.parent); + struct max14577_platform_data *pdata = dev_get_platdata(max14577->dev); + int i, ret; + struct regulator_config config = {}; + + ret = max14577_regulator_dt_parse_pdata(pdev); + if (ret) + return ret; + + config.dev = &pdev->dev; + config.regmap = max14577->regmap; + + for (i = 0; i < ARRAY_SIZE(supported_regulators); i++) { + struct regulator_dev *regulator; + /* + * Index of supported_regulators[] is also the id and must + * match index of pdata->regulators[]. + */ + if (pdata && pdata->regulators) { + config.init_data = pdata->regulators[i].initdata; + config.of_node = pdata->regulators[i].of_node; + } else { + config.init_data = match_init_data(i); + config.of_node = match_of_node(i); + } + + regulator = devm_regulator_register(&pdev->dev, + &supported_regulators[i], &config); + if (IS_ERR(regulator)) { + ret = PTR_ERR(regulator); + dev_err(&pdev->dev, + "Regulator init failed for ID %d with error: %d\n", + i, ret); + return ret; + } + } + + return ret; +} + +static struct platform_driver max14577_regulator_driver = { + .driver = { + .owner = THIS_MODULE, + .name = "max14577-regulator", + }, + .probe = max14577_regulator_probe, +}; + +static int __init max14577_regulator_init(void) +{ + BUILD_BUG_ON(MAX14577_REGULATOR_CURRENT_LIMIT_HIGH_START + + MAX14577_REGULATOR_CURRENT_LIMIT_HIGH_STEP * 0xf != + MAX14577_REGULATOR_CURRENT_LIMIT_MAX); + BUILD_BUG_ON(ARRAY_SIZE(supported_regulators) != MAX14577_REG_MAX); + + return platform_driver_register(&max14577_regulator_driver); +} +subsys_initcall(max14577_regulator_init); + +static void __exit max14577_regulator_exit(void) +{ + platform_driver_unregister(&max14577_regulator_driver); +} +module_exit(max14577_regulator_exit); + +MODULE_AUTHOR("Krzysztof Kozlowski <k.kozlowski@samsung.com>"); +MODULE_DESCRIPTION("MAXIM 14577 regulator driver"); +MODULE_LICENSE("GPL"); +MODULE_ALIAS("platform:max14577-regulator"); |