mirror of https://github.com/Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
272 lines
6.7 KiB
272 lines
6.7 KiB
// SPDX-License-Identifier: GPL-2.0-only |
|
/* |
|
* Regulators driver for Maxim max8649 |
|
* |
|
* Copyright (C) 2009-2010 Marvell International Ltd. |
|
* Haojian Zhuang <[email protected]> |
|
*/ |
|
#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 <[email protected]>"); |
|
MODULE_LICENSE("GPL");
|
|
|