123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234235236237238239240241242243244245246247248249250251252253254255256257258259260261262263264265266267268269270271272273274275276277278279280281282283284285286287288289290291292293294295296297298299300301302303304305306307308309310311312313314315316317318319320321322323324325326327328329330331332333334335336337338339340341342343344345346347 |
- /*
- * 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");
|