diff options
Diffstat (limited to 'drivers/regulator/max8925-regulator.c')
| -rw-r--r-- | drivers/regulator/max8925-regulator.c | 306 |
1 files changed, 306 insertions, 0 deletions
diff --git a/drivers/regulator/max8925-regulator.c b/drivers/regulator/max8925-regulator.c new file mode 100644 index 00000000000..67873f08ed4 --- /dev/null +++ b/drivers/regulator/max8925-regulator.c @@ -0,0 +1,306 @@ +/* + * 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/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> + +#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 */ + +struct max8925_regulator_info { + struct regulator_desc desc; + struct regulator_dev *regulator; + struct i2c_client *i2c; + struct max8925_chip *chip; + + int min_uV; + int max_uV; + int step_uV; + int vol_reg; + int vol_shift; + int vol_nbits; + int enable_bit; + int enable_reg; +}; + +static inline int check_range(struct max8925_regulator_info *info, + int min_uV, int max_uV) +{ + if (min_uV < info->min_uV || min_uV > info->max_uV) + return -EINVAL; + + return 0; +} + +static int max8925_list_voltage(struct regulator_dev *rdev, unsigned index) +{ + struct max8925_regulator_info *info = rdev_get_drvdata(rdev); + return info->min_uV + index * info->step_uV; +} + +static int max8925_set_voltage(struct regulator_dev *rdev, + int min_uV, int max_uV) +{ + struct max8925_regulator_info *info = rdev_get_drvdata(rdev); + unsigned char data, mask; + + if (check_range(info, min_uV, max_uV)) { + dev_err(info->chip->dev, "invalid voltage range (%d, %d) uV\n", + min_uV, max_uV); + return -EINVAL; + } + data = (min_uV - info->min_uV + info->step_uV - 1) / info->step_uV; + data <<= info->vol_shift; + mask = ((1 << info->vol_nbits) - 1) << info->vol_shift; + + return max8925_set_bits(info->i2c, info->vol_reg, mask, data); +} + +static int max8925_get_voltage(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 = ((1 << info->vol_nbits) - 1) << info->vol_shift; + data = (ret & mask) >> info->vol_shift; + + return max8925_list_voltage(rdev, 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, + 1 << info->enable_bit, + 1 << info->enable_bit); +} + +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, + 1 << info->enable_bit, 0); +} + +static int max8925_is_enabled(struct regulator_dev *rdev) +{ + struct max8925_regulator_info *info = rdev_get_drvdata(rdev); + int ret; + + ret = max8925_reg_read(info->i2c, info->vol_reg); + if (ret < 0) + return ret; + + return ret & (1 << info->enable_bit); +} + +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 = (uV - SD1_DVM_VMIN + SD1_DVM_STEP - 1) / 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 struct regulator_ops max8925_regulator_sdv_ops = { + .set_voltage = max8925_set_voltage, + .get_voltage = max8925_get_voltage, + .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 struct regulator_ops max8925_regulator_ldo_ops = { + .set_voltage = max8925_set_voltage, + .get_voltage = max8925_get_voltage, + .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, \ + }, \ + .min_uV = min * 1000, \ + .max_uV = max * 1000, \ + .step_uV = step * 1000, \ + .vol_reg = MAX8925_SDV##_id, \ + .vol_shift = 0, \ + .vol_nbits = 6, \ + .enable_reg = MAX8925_SDCTL##_id, \ + .enable_bit = 0, \ +} + +#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, \ + }, \ + .min_uV = min * 1000, \ + .max_uV = max * 1000, \ + .step_uV = step * 1000, \ + .vol_reg = MAX8925_LDOVOUT##_id, \ + .vol_shift = 0, \ + .vol_nbits = 6, \ + .enable_reg = MAX8925_LDOCTL##_id, \ + .enable_bit = 0, \ +} + +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), +}; + +static inline struct max8925_regulator_info *find_regulator_info(int id) +{ + struct max8925_regulator_info *ri; + int i; + + for (i = 0; i < ARRAY_SIZE(max8925_regulator_info); i++) { + ri = &max8925_regulator_info[i]; + if (ri->desc.id == id) + return ri; + } + return NULL; +} + +static int __devinit max8925_regulator_probe(struct platform_device *pdev) +{ + struct max8925_chip *chip = dev_get_drvdata(pdev->dev.parent); + struct max8925_platform_data *pdata = chip->dev->platform_data; + struct max8925_regulator_info *ri = NULL; + struct regulator_dev *rdev; + + ri = find_regulator_info(pdev->id); + if (ri == NULL) { + dev_err(&pdev->dev, "invalid regulator ID specified\n"); + return -EINVAL; + } + ri->i2c = chip->i2c; + ri->chip = chip; + + rdev = regulator_register(&ri->desc, &pdev->dev, + pdata->regulator[pdev->id], ri); + 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 int __devexit max8925_regulator_remove(struct platform_device *pdev) +{ + struct regulator_dev *rdev = platform_get_drvdata(pdev); + + regulator_unregister(rdev); + return 0; +} + +static struct platform_driver max8925_regulator_driver = { + .driver = { + .name = "max8925-regulator", + .owner = THIS_MODULE, + }, + .probe = max8925_regulator_probe, + .remove = __devexit_p(max8925_regulator_remove), +}; + +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"); + |