diff options
Diffstat (limited to 'drivers/regulator/max8649.c')
| -rw-r--r-- | drivers/regulator/max8649.c | 275 |
1 files changed, 275 insertions, 0 deletions
diff --git a/drivers/regulator/max8649.c b/drivers/regulator/max8649.c new file mode 100644 index 000000000..81229579e --- /dev/null +++ b/drivers/regulator/max8649.c @@ -0,0 +1,275 @@ +/* + * Regulators driver for Maxim max8649 + * + * Copyright (C) 2009-2010 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/err.h> +#include <linux/i2c.h> +#include <linux/platform_device.h> +#include <linux/regulator/driver.h> +#include <linux/slab.h> +#include <linux/regulator/max8649.h> +#include <linux/regmap.h> + +#define MAX8649_DCDC_VMIN 750000 /* uV */ +#define MAX8649_DCDC_VMAX 1380000 /* uV */ +#define MAX8649_DCDC_STEP 10000 /* uV */ +#define MAX8649_VOL_MASK 0x3f + +/* Registers */ +#define MAX8649_MODE0 0x00 +#define MAX8649_MODE1 0x01 +#define MAX8649_MODE2 0x02 +#define MAX8649_MODE3 0x03 +#define MAX8649_CONTROL 0x04 +#define MAX8649_SYNC 0x05 +#define MAX8649_RAMP 0x06 +#define MAX8649_CHIP_ID1 0x08 +#define MAX8649_CHIP_ID2 0x09 + +/* Bits */ +#define MAX8649_EN_PD (1 << 7) +#define MAX8649_VID0_PD (1 << 6) +#define MAX8649_VID1_PD (1 << 5) +#define MAX8649_VID_MASK (3 << 5) + +#define MAX8649_FORCE_PWM (1 << 7) +#define MAX8649_SYNC_EXTCLK (1 << 6) + +#define MAX8649_EXT_MASK (3 << 6) + +#define MAX8649_RAMP_MASK (7 << 5) +#define MAX8649_RAMP_DOWN (1 << 1) + +struct max8649_regulator_info { + struct device *dev; + struct regmap *regmap; + + unsigned mode:2; /* bit[1:0] = VID1, VID0 */ + unsigned extclk_freq:2; + unsigned extclk:1; + unsigned ramp_timing:3; + unsigned ramp_down:1; +}; + +static int max8649_enable_time(struct regulator_dev *rdev) +{ + struct max8649_regulator_info *info = rdev_get_drvdata(rdev); + int voltage, rate, ret; + unsigned int val; + + /* get voltage */ + ret = regmap_read(info->regmap, rdev->desc->vsel_reg, &val); + if (ret != 0) + return ret; + val &= MAX8649_VOL_MASK; + voltage = regulator_list_voltage_linear(rdev, (unsigned char)val); + + /* get rate */ + ret = regmap_read(info->regmap, MAX8649_RAMP, &val); + if (ret != 0) + return ret; + ret = (val & MAX8649_RAMP_MASK) >> 5; + rate = (32 * 1000) >> ret; /* uV/uS */ + + return DIV_ROUND_UP(voltage, rate); +} + +static int max8649_set_mode(struct regulator_dev *rdev, unsigned int mode) +{ + struct max8649_regulator_info *info = rdev_get_drvdata(rdev); + + switch (mode) { + case REGULATOR_MODE_FAST: + regmap_update_bits(info->regmap, rdev->desc->vsel_reg, + MAX8649_FORCE_PWM, MAX8649_FORCE_PWM); + break; + case REGULATOR_MODE_NORMAL: + regmap_update_bits(info->regmap, rdev->desc->vsel_reg, + MAX8649_FORCE_PWM, 0); + break; + default: + return -EINVAL; + } + return 0; +} + +static unsigned int max8649_get_mode(struct regulator_dev *rdev) +{ + struct max8649_regulator_info *info = rdev_get_drvdata(rdev); + unsigned int val; + int ret; + + ret = regmap_read(info->regmap, rdev->desc->vsel_reg, &val); + if (ret != 0) + return ret; + if (val & MAX8649_FORCE_PWM) + return REGULATOR_MODE_FAST; + return REGULATOR_MODE_NORMAL; +} + +static const struct regulator_ops max8649_dcdc_ops = { + .set_voltage_sel = regulator_set_voltage_sel_regmap, + .get_voltage_sel = regulator_get_voltage_sel_regmap, + .list_voltage = regulator_list_voltage_linear, + .map_voltage = regulator_map_voltage_linear, + .enable = regulator_enable_regmap, + .disable = regulator_disable_regmap, + .is_enabled = regulator_is_enabled_regmap, + .enable_time = max8649_enable_time, + .set_mode = max8649_set_mode, + .get_mode = max8649_get_mode, + +}; + +static struct regulator_desc dcdc_desc = { + .name = "max8649", + .ops = &max8649_dcdc_ops, + .type = REGULATOR_VOLTAGE, + .n_voltages = 1 << 6, + .owner = THIS_MODULE, + .vsel_mask = MAX8649_VOL_MASK, + .min_uV = MAX8649_DCDC_VMIN, + .uV_step = MAX8649_DCDC_STEP, + .enable_reg = MAX8649_CONTROL, + .enable_mask = MAX8649_EN_PD, + .enable_is_inverted = true, +}; + +static const struct regmap_config max8649_regmap_config = { + .reg_bits = 8, + .val_bits = 8, +}; + +static int max8649_regulator_probe(struct i2c_client *client, + const struct i2c_device_id *id) +{ + struct max8649_platform_data *pdata = dev_get_platdata(&client->dev); + struct max8649_regulator_info *info = NULL; + struct regulator_dev *regulator; + struct regulator_config config = { }; + unsigned int val; + unsigned char data; + int ret; + + info = devm_kzalloc(&client->dev, sizeof(struct max8649_regulator_info), + GFP_KERNEL); + if (!info) + return -ENOMEM; + + info->regmap = devm_regmap_init_i2c(client, &max8649_regmap_config); + if (IS_ERR(info->regmap)) { + ret = PTR_ERR(info->regmap); + dev_err(&client->dev, "Failed to allocate register map: %d\n", ret); + return ret; + } + + info->dev = &client->dev; + i2c_set_clientdata(client, info); + + info->mode = pdata->mode; + switch (info->mode) { + case 0: + dcdc_desc.vsel_reg = MAX8649_MODE0; + break; + case 1: + dcdc_desc.vsel_reg = MAX8649_MODE1; + break; + case 2: + dcdc_desc.vsel_reg = MAX8649_MODE2; + break; + case 3: + dcdc_desc.vsel_reg = MAX8649_MODE3; + break; + default: + break; + } + + ret = regmap_read(info->regmap, MAX8649_CHIP_ID1, &val); + if (ret != 0) { + dev_err(info->dev, "Failed to detect ID of MAX8649:%d\n", + ret); + return ret; + } + dev_info(info->dev, "Detected MAX8649 (ID:%x)\n", val); + + /* enable VID0 & VID1 */ + regmap_update_bits(info->regmap, MAX8649_CONTROL, MAX8649_VID_MASK, 0); + + /* enable/disable external clock synchronization */ + info->extclk = pdata->extclk; + data = (info->extclk) ? MAX8649_SYNC_EXTCLK : 0; + regmap_update_bits(info->regmap, dcdc_desc.vsel_reg, + MAX8649_SYNC_EXTCLK, data); + if (info->extclk) { + /* set external clock frequency */ + info->extclk_freq = pdata->extclk_freq; + regmap_update_bits(info->regmap, MAX8649_SYNC, MAX8649_EXT_MASK, + info->extclk_freq << 6); + } + + if (pdata->ramp_timing) { + info->ramp_timing = pdata->ramp_timing; + regmap_update_bits(info->regmap, MAX8649_RAMP, MAX8649_RAMP_MASK, + info->ramp_timing << 5); + } + + info->ramp_down = pdata->ramp_down; + if (info->ramp_down) { + regmap_update_bits(info->regmap, MAX8649_RAMP, MAX8649_RAMP_DOWN, + MAX8649_RAMP_DOWN); + } + + config.dev = &client->dev; + config.init_data = pdata->regulator; + config.driver_data = info; + config.regmap = info->regmap; + + regulator = devm_regulator_register(&client->dev, &dcdc_desc, + &config); + if (IS_ERR(regulator)) { + dev_err(info->dev, "failed to register regulator %s\n", + dcdc_desc.name); + return PTR_ERR(regulator); + } + + return 0; +} + +static const struct i2c_device_id max8649_id[] = { + { "max8649", 0 }, + { } +}; +MODULE_DEVICE_TABLE(i2c, max8649_id); + +static struct i2c_driver max8649_driver = { + .probe = max8649_regulator_probe, + .driver = { + .name = "max8649", + }, + .id_table = max8649_id, +}; + +static int __init max8649_init(void) +{ + return i2c_add_driver(&max8649_driver); +} +subsys_initcall(max8649_init); + +static void __exit max8649_exit(void) +{ + i2c_del_driver(&max8649_driver); +} +module_exit(max8649_exit); + +/* Module information */ +MODULE_DESCRIPTION("MAXIM 8649 voltage regulator driver"); +MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>"); +MODULE_LICENSE("GPL"); |