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kernel_samsung_sm7125/drivers/regulator/s2dos03-regulator.c

384 lines
9.9 KiB

/*
* Copyright (c) 2016, The Linux Foundation. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 and
* only version 2 as published by the Free Software Foundation.
*
* 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.
*/
#define pr_fmt(fmt) "%s: " fmt, __func__
#include <linux/err.h>
#include <linux/slab.h>
#include <linux/platform_device.h>
#include <linux/i2c.h>
#include <linux/regulator/driver.h>
#include <linux/regmap.h>
#include <linux/module.h>
#include <linux/regulator/of_regulator.h>
#include <linux/of.h>
#include <linux/regulator/s2dos03-regulator.h>
#define M2SH __CONST_FFS
static const struct regmap_config s2dos03_regmap_config = {
.reg_bits = 8,
.val_bits = 8,
.cache_type = REGCACHE_NONE,
};
struct s2dos03_reg {
struct device *dev;
struct regulator_dev **rdev;
int num_regulators;
struct regmap *regmap;
};
static struct regulator_ops s2dos03_reg_ops = {
.list_voltage = regulator_list_voltage_linear,
.map_voltage = regulator_map_voltage_linear,
.is_enabled = regulator_is_enabled_regmap,
.enable = regulator_enable_regmap,
.disable = regulator_disable_regmap,
.get_voltage_sel = regulator_get_voltage_sel_regmap,
.set_voltage_sel = regulator_set_voltage_sel_regmap,
};
#define REGULATOR_DESC_PLDO(num) { \
.name = "s2dos03-ldo"#num, \
.id = S2DOS03_LDO##num, \
.ops = &s2dos03_reg_ops, \
.type = REGULATOR_VOLTAGE, \
.owner = THIS_MODULE, \
.n_voltages = BIT_LX_VOUT + 1, \
.min_uV = LDO_MINUV, \
.uV_step = LDO_STEP, \
.vsel_reg = REG_LDO##num##_CFG, \
.vsel_mask = BIT_LX_VOUT, \
.enable_reg = REG_REG_EN, \
.enable_mask = BIT_L##num##_EN, \
}
#define REGULATOR_DESC_BUCK() { \
.name = "s2dos03-buck", \
.id = S2DOS03_BUCK, \
.ops = &s2dos03_reg_ops, \
.type = REGULATOR_VOLTAGE, \
.owner = THIS_MODULE, \
.n_voltages = BIT_B_VOUT + 1, \
.min_uV = BUCK_MINUV, \
.uV_step = BUCK_STEP, \
.vsel_reg = REG_BUCK_VOUT, \
.vsel_mask = BIT_B_VOUT, \
.enable_reg = REG_REG_EN, \
.enable_mask = BIT_B_EN, \
}
const static struct regulator_desc s2dos03_reg_desc[] =
{
REGULATOR_DESC_PLDO(1),
REGULATOR_DESC_PLDO(2),
REGULATOR_DESC_PLDO(3),
REGULATOR_DESC_PLDO(4),
REGULATOR_DESC_BUCK(),
};
static int s2dos03_reg_set_active_discharge(struct s2dos03_reg *s2dos03_reg,
struct s2dos03_regulator_platform_data *pdata, int reg_id)
{
int rc, reg, val;
switch (reg_id) {
case S2DOS03_LDO1 ... S2DOS03_LDO4:
val = pdata->regulators[reg_id - 1].active_discharge_enable ? BIT_LX_AD : 0;
reg = REG_LDOX_CFG(reg_id);
rc = regmap_update_bits(s2dos03_reg->regmap, reg, BIT_LX_AD, val);
break;
case S2DOS03_BUCK:
val = pdata->regulators[reg_id - 1].active_discharge_enable ? BIT_B_AD : 0;
reg = REG_BUCK_CFG;
rc = regmap_update_bits(s2dos03_reg->regmap, reg, BIT_B_AD, val);
break;
default:
rc = -EINVAL;
break;
}
return rc;
}
static int s2dos03_reg_hw_init(struct s2dos03_reg *s2dos03_reg,
struct s2dos03_regulator_platform_data *pdata)
{
int rc, reg, val;
/* buck configuration */
reg = REG_BUCK_CFG;
val = pdata->buck_ramp_up<<M2SH(BIT_B_RU_SR) |
pdata->buck_ramp_down<<M2SH(BIT_B_RD_SR) |
pdata->buck_fpwm<<M2SH(BIT_B_FPWM) |
pdata->buck_fsrad<<M2SH(BIT_B_FSRAD);
rc = regmap_update_bits(s2dos03_reg->regmap, reg,
BIT_B_RU_SR | BIT_B_RD_SR | BIT_B_FPWM | BIT_B_FSRAD, val);
if (rc != 0)
return rc;
/* uvlo falling threshold */
reg = REG_UVLO_CFG1;
val = pdata->uvlo_fall_threshold<<M2SH(BIT_UVLO_F);
rc = regmap_write(s2dos03_reg->regmap, reg, val);
return rc;
}
#ifdef CONFIG_OF
static struct s2dos03_regulator_platform_data *s2dos03_reg_parse_dt(struct device *dev)
{
struct device_node *nproot = dev->of_node;
struct device_node *regulators_np, *reg_np;
struct s2dos03_regulator_platform_data *pdata;
struct s2dos03_regulator_data *rdata;
int i;
int ret;
if (unlikely(nproot == NULL))
return ERR_PTR(-EINVAL);
regulators_np = of_find_node_by_name(nproot, "regulators");
if (unlikely(regulators_np == NULL))
{
dev_err(dev, "regulators node not found\n");
return ERR_PTR(-EINVAL);
}
pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
/* count the number of regulators to be supported in pmic */
pdata->num_regulators = of_get_child_count(regulators_np);
rdata = devm_kzalloc(dev, sizeof(*rdata) *
pdata->num_regulators, GFP_KERNEL);
if (!rdata) {
of_node_put(regulators_np);
dev_err(dev, "could not allocate memory for regulator data\n");
return ERR_PTR(-ENOMEM);
}
pdata->regulators = rdata;
for_each_child_of_node(regulators_np, reg_np) {
for (i = 0; i < ARRAY_SIZE(s2dos03_reg_desc); i++)
if (!of_node_cmp(reg_np->name, s2dos03_reg_desc[i].name))
break;
if (i == ARRAY_SIZE(s2dos03_reg_desc)) {
dev_warn(dev, "don't know how to configure regulator %s\n",
reg_np->name);
continue;
}
rdata->initdata = of_get_regulator_init_data(dev, reg_np, s2dos03_reg_desc);
rdata->of_node = reg_np;
ret = of_property_read_u32(reg_np, "active-discharge-enable",
&rdata->active_discharge_enable);
if (ret != 0)
rdata->active_discharge_enable = 1;
rdata++;
}
of_node_put(regulators_np);
ret = of_property_read_u32(nproot, "buck-ramp-up",
&pdata->buck_ramp_up);
if (ret != 0)
pdata->buck_ramp_up = 1; /* 12.5mV/us */
ret = of_property_read_u32(nproot, "buck-ramp-down",
&pdata->buck_ramp_down);
if (ret != 0)
pdata->buck_ramp_down = 1; /* 6.25mV/us */
ret = of_property_read_u32(nproot, "buck-fpwm",
&pdata->buck_fpwm);
if (ret != 0)
pdata->buck_fpwm = 0; /* turn off FPWM */
ret = of_property_read_u32(nproot, "buck-fsrad",
&pdata->buck_fsrad);
if (ret != 0)
pdata->buck_fsrad = 1; /* enable Active Discharge */
ret = of_property_read_u32(nproot, "uvlo-fall-threshold",
&pdata->uvlo_fall_threshold);
if (ret != 0)
pdata->uvlo_fall_threshold = 3; /* 2.45V */
return pdata;
}
#endif
static void s2dos03_destroy (struct s2dos03_reg *me)
{
struct device *dev = me->dev;
if (likely(me->regmap))
regmap_exit(me->regmap);
devm_kfree(dev, me);
}
static int s2dos03_regulator_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct device *dev = &client->dev;
struct s2dos03_regulator_platform_data *pdata;
struct s2dos03_reg *s2dos03_reg;
struct regulator_config config = { };
int rc, i, size;
pr_info("<%s> probe start\n", client->name);
s2dos03_reg = devm_kzalloc(dev, sizeof(struct s2dos03_reg),
GFP_KERNEL);
if (unlikely(!s2dos03_reg))
return -ENOMEM;
i2c_set_clientdata(client, s2dos03_reg);
#ifdef CONFIG_OF
pdata = s2dos03_reg_parse_dt(dev);
if (IS_ERR(pdata))
return PTR_ERR(pdata);
#else
pdata = dev_get_platdata(dev);
#endif
size = sizeof(struct regulator_dev *) * pdata->num_regulators;
s2dos03_reg->rdev = devm_kzalloc(dev, size, GFP_KERNEL);
if (!s2dos03_reg->rdev)
return -ENOMEM;
s2dos03_reg->dev = &client->dev;
s2dos03_reg->regmap = devm_regmap_init_i2c(client,
&s2dos03_regmap_config);
if (unlikely(IS_ERR(s2dos03_reg->regmap))) {
rc = PTR_ERR(s2dos03_reg->regmap);
s2dos03_reg->regmap = NULL;
pr_err("<%s> failed to initialize i2c regmap pmic [%d]\n",
client->name, rc);
goto abort;
}
s2dos03_reg->num_regulators = pdata->num_regulators;
for (i = 0; i < pdata->num_regulators; i++) {
config.dev = &client->dev;
config.init_data = pdata->regulators[i].initdata;
config.of_node = pdata->regulators[i].of_node;
config.regmap = s2dos03_reg->regmap;
config.driver_data = s2dos03_reg;
s2dos03_reg->rdev[i] =
regulator_register(&s2dos03_reg_desc[i], &config);
if (IS_ERR(s2dos03_reg->rdev[i])) {
rc = PTR_ERR(s2dos03_reg->rdev[i]);
pr_err("<%s> regulator init failed for %d\n",
client->name, i);
s2dos03_reg->rdev[i] = NULL;
goto abort;
}
rc= s2dos03_reg_set_active_discharge(s2dos03_reg, pdata,
s2dos03_reg_desc[i].id);
if (rc!=0) //(IS_ERR_VALUE(rc))
goto abort;
}
/* initialize platform data */
rc= s2dos03_reg_hw_init(s2dos03_reg, pdata);
if (rc!=0) //(IS_ERR_VALUE(rc))
goto abort;
pr_info("<%s> probe end\n", client->name);
return 0;
abort:
i2c_set_clientdata(client, NULL);
s2dos03_destroy(s2dos03_reg);
return rc;
}
static int s2dos03_regulator_remove(struct i2c_client *client)
{
struct s2dos03_reg *s2dos03_reg = i2c_get_clientdata(client);
int i;
for (i = 0; i < s2dos03_reg->num_regulators; i++)
regulator_unregister(s2dos03_reg->rdev[i]);
i2c_set_clientdata(client, NULL);
s2dos03_destroy(s2dos03_reg);
return 0;
}
#ifdef CONFIG_OF
static struct of_device_id s2dos03_of_id[] = {
{ .compatible = "slsi,s2dos03" },
{ },
};
MODULE_DEVICE_TABLE(of, s2dos03_of_id);
#endif /* CONFIG_OF */
static const struct i2c_device_id s2dos03_i2c_id[] = {
{ "s2dos03", 0 },
{ },
};
MODULE_DEVICE_TABLE(i2c, s2dos03_i2c_id);
static struct i2c_driver s2dos03_i2c_driver = {
.driver.name = "s2dos03",
.driver.owner = THIS_MODULE,
#ifdef CONFIG_OF
.driver.of_match_table = s2dos03_of_id,
#endif /* CONFIG_OF */
.driver.suppress_bind_attrs = true,
.id_table = s2dos03_i2c_id,
.probe = s2dos03_regulator_probe,
.remove = s2dos03_regulator_remove,
};
static __init int s2dos03_init (void)
{
int rc = -ENODEV;
rc = i2c_add_driver(&s2dos03_i2c_driver);
if (rc != 0)
pr_err("Failed to register I2C driver: %d\n", rc);
return rc;
}
subsys_initcall(s2dos03_init);
static __exit void s2dos03_exit (void)
{
i2c_del_driver(&s2dos03_i2c_driver);
}
module_exit(s2dos03_exit);
MODULE_ALIAS("platform:s2dos03-regulator");
MODULE_DESCRIPTION("Regulator driver for S2DOS03");
MODULE_LICENSE("GPL v2");
MODULE_VERSION("1.0");