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linux/drivers/regulator/fan53555.c
Javier Martinez Canillas e80c47bd73 regulator: fan53555: Export I2C module alias information 
The I2C core always reports the MODALIAS uevent as "i2c:<client name"
regardless if the driver was matched using the I2C id_table or the
of_match_table. So the driver needs to export the I2C table and this
be built into the module or udev won't have the necessary information
to auto load the correct module when the device is added.

Signed-off-by: Javier Martinez Canillas <javier@osg.samsung.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
2015-07-31 18:15:21 +01:00

458 lines
11 KiB
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/*
* FAN53555 Fairchild Digitally Programmable TinyBuck Regulator Driver.
*
* Supported Part Numbers:
* FAN53555UC00X/01X/03X/04X/05X
*
* Copyright (c) 2012 Marvell Technology Ltd.
* Yunfan Zhang <yfzhang@marvell.com>
*
* This package 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/module.h>
#include <linux/param.h>
#include <linux/err.h>
#include <linux/platform_device.h>
#include <linux/regulator/driver.h>
#include <linux/regulator/machine.h>
#include <linux/regulator/of_regulator.h>
#include <linux/of_device.h>
#include <linux/i2c.h>
#include <linux/slab.h>
#include <linux/regmap.h>
#include <linux/regulator/fan53555.h>
/* Voltage setting */
#define FAN53555_VSEL0 0x00
#define FAN53555_VSEL1 0x01
/* Control register */
#define FAN53555_CONTROL 0x02
/* IC Type */
#define FAN53555_ID1 0x03
/* IC mask version */
#define FAN53555_ID2 0x04
/* Monitor register */
#define FAN53555_MONITOR 0x05
/* VSEL bit definitions */
#define VSEL_BUCK_EN (1 << 7)
#define VSEL_MODE (1 << 6)
#define VSEL_NSEL_MASK 0x3F
/* Chip ID and Verison */
#define DIE_ID 0x0F /* ID1 */
#define DIE_REV 0x0F /* ID2 */
/* Control bit definitions */
#define CTL_OUTPUT_DISCHG (1 << 7)
#define CTL_SLEW_MASK (0x7 << 4)
#define CTL_SLEW_SHIFT 4
#define CTL_RESET (1 << 2)
#define FAN53555_NVOLTAGES 64 /* Numbers of voltages */
enum fan53555_vendor {
FAN53555_VENDOR_FAIRCHILD = 0,
FAN53555_VENDOR_SILERGY,
};
/* IC Type */
enum {
FAN53555_CHIP_ID_00 = 0,
FAN53555_CHIP_ID_01,
FAN53555_CHIP_ID_02,
FAN53555_CHIP_ID_03,
FAN53555_CHIP_ID_04,
FAN53555_CHIP_ID_05,
};
enum {
SILERGY_SYR82X = 8,
};
struct fan53555_device_info {
enum fan53555_vendor vendor;
struct regmap *regmap;
struct device *dev;
struct regulator_desc desc;
struct regulator_dev *rdev;
struct regulator_init_data *regulator;
/* IC Type and Rev */
int chip_id;
int chip_rev;
/* Voltage setting register */
unsigned int vol_reg;
unsigned int sleep_reg;
/* Voltage range and step(linear) */
unsigned int vsel_min;
unsigned int vsel_step;
/* Voltage slew rate limiting */
unsigned int slew_rate;
/* Sleep voltage cache */
unsigned int sleep_vol_cache;
};
static int fan53555_set_suspend_voltage(struct regulator_dev *rdev, int uV)
{
struct fan53555_device_info *di = rdev_get_drvdata(rdev);
int ret;
if (di->sleep_vol_cache == uV)
return 0;
ret = regulator_map_voltage_linear(rdev, uV, uV);
if (ret < 0)
return ret;
ret = regmap_update_bits(di->regmap, di->sleep_reg,
VSEL_NSEL_MASK, ret);
if (ret < 0)
return ret;
/* Cache the sleep voltage setting.
* Might not be the real voltage which is rounded */
di->sleep_vol_cache = uV;
return 0;
}
static int fan53555_set_mode(struct regulator_dev *rdev, unsigned int mode)
{
struct fan53555_device_info *di = rdev_get_drvdata(rdev);
switch (mode) {
case REGULATOR_MODE_FAST:
regmap_update_bits(di->regmap, di->vol_reg,
VSEL_MODE, VSEL_MODE);
break;
case REGULATOR_MODE_NORMAL:
regmap_update_bits(di->regmap, di->vol_reg, VSEL_MODE, 0);
break;
default:
return -EINVAL;
}
return 0;
}
static unsigned int fan53555_get_mode(struct regulator_dev *rdev)
{
struct fan53555_device_info *di = rdev_get_drvdata(rdev);
unsigned int val;
int ret = 0;
ret = regmap_read(di->regmap, di->vol_reg, &val);
if (ret < 0)
return ret;
if (val & VSEL_MODE)
return REGULATOR_MODE_FAST;
else
return REGULATOR_MODE_NORMAL;
}
static const int slew_rates[] = {
64000,
32000,
16000,
8000,
4000,
2000,
1000,
500,
};
static int fan53555_set_ramp(struct regulator_dev *rdev, int ramp)
{
struct fan53555_device_info *di = rdev_get_drvdata(rdev);
int regval = -1, i;
for (i = 0; i < ARRAY_SIZE(slew_rates); i++) {
if (ramp <= slew_rates[i])
regval = i;
else
break;
}
if (regval < 0) {
dev_err(di->dev, "unsupported ramp value %d\n", ramp);
return -EINVAL;
}
return regmap_update_bits(di->regmap, FAN53555_CONTROL,
CTL_SLEW_MASK, regval << CTL_SLEW_SHIFT);
}
static struct regulator_ops fan53555_regulator_ops = {
.set_voltage_sel = regulator_set_voltage_sel_regmap,
.get_voltage_sel = regulator_get_voltage_sel_regmap,
.set_voltage_time_sel = regulator_set_voltage_time_sel,
.map_voltage = regulator_map_voltage_linear,
.list_voltage = regulator_list_voltage_linear,
.set_suspend_voltage = fan53555_set_suspend_voltage,
.enable = regulator_enable_regmap,
.disable = regulator_disable_regmap,
.is_enabled = regulator_is_enabled_regmap,
.set_mode = fan53555_set_mode,
.get_mode = fan53555_get_mode,
.set_ramp_delay = fan53555_set_ramp,
};
static int fan53555_voltages_setup_fairchild(struct fan53555_device_info *di)
{
/* Init voltage range and step */
switch (di->chip_id) {
case FAN53555_CHIP_ID_00:
case FAN53555_CHIP_ID_01:
case FAN53555_CHIP_ID_03:
case FAN53555_CHIP_ID_05:
di->vsel_min = 600000;
di->vsel_step = 10000;
break;
case FAN53555_CHIP_ID_04:
di->vsel_min = 603000;
di->vsel_step = 12826;
break;
default:
dev_err(di->dev,
"Chip ID %d not supported!\n", di->chip_id);
return -EINVAL;
}
return 0;
}
static int fan53555_voltages_setup_silergy(struct fan53555_device_info *di)
{
/* Init voltage range and step */
switch (di->chip_id) {
case SILERGY_SYR82X:
di->vsel_min = 712500;
di->vsel_step = 12500;
break;
default:
dev_err(di->dev,
"Chip ID %d not supported!\n", di->chip_id);
return -EINVAL;
}
return 0;
}
/* For 00,01,03,05 options:
* VOUT = 0.60V + NSELx * 10mV, from 0.60 to 1.23V.
* For 04 option:
* VOUT = 0.603V + NSELx * 12.826mV, from 0.603 to 1.411V.
* */
static int fan53555_device_setup(struct fan53555_device_info *di,
struct fan53555_platform_data *pdata)
{
int ret = 0;
/* Setup voltage control register */
switch (pdata->sleep_vsel_id) {
case FAN53555_VSEL_ID_0:
di->sleep_reg = FAN53555_VSEL0;
di->vol_reg = FAN53555_VSEL1;
break;
case FAN53555_VSEL_ID_1:
di->sleep_reg = FAN53555_VSEL1;
di->vol_reg = FAN53555_VSEL0;
break;
default:
dev_err(di->dev, "Invalid VSEL ID!\n");
return -EINVAL;
}
switch (di->vendor) {
case FAN53555_VENDOR_FAIRCHILD:
ret = fan53555_voltages_setup_fairchild(di);
break;
case FAN53555_VENDOR_SILERGY:
ret = fan53555_voltages_setup_silergy(di);
break;
default:
dev_err(di->dev, "vendor %d not supported!\n", di->vendor);
return -EINVAL;
}
return ret;
}
static int fan53555_regulator_register(struct fan53555_device_info *di,
struct regulator_config *config)
{
struct regulator_desc *rdesc = &di->desc;
rdesc->name = "fan53555-reg";
rdesc->supply_name = "vin";
rdesc->ops = &fan53555_regulator_ops;
rdesc->type = REGULATOR_VOLTAGE;
rdesc->n_voltages = FAN53555_NVOLTAGES;
rdesc->enable_reg = di->vol_reg;
rdesc->enable_mask = VSEL_BUCK_EN;
rdesc->min_uV = di->vsel_min;
rdesc->uV_step = di->vsel_step;
rdesc->vsel_reg = di->vol_reg;
rdesc->vsel_mask = VSEL_NSEL_MASK;
rdesc->owner = THIS_MODULE;
di->rdev = devm_regulator_register(di->dev, &di->desc, config);
return PTR_ERR_OR_ZERO(di->rdev);
}
static const struct regmap_config fan53555_regmap_config = {
.reg_bits = 8,
.val_bits = 8,
};
static struct fan53555_platform_data *fan53555_parse_dt(struct device *dev,
struct device_node *np,
const struct regulator_desc *desc)
{
struct fan53555_platform_data *pdata;
int ret;
u32 tmp;
pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
if (!pdata)
return NULL;
pdata->regulator = of_get_regulator_init_data(dev, np, desc);
ret = of_property_read_u32(np, "fcs,suspend-voltage-selector",
&tmp);
if (!ret)
pdata->sleep_vsel_id = tmp;
return pdata;
}
static const struct of_device_id fan53555_dt_ids[] = {
{
.compatible = "fcs,fan53555",
.data = (void *)FAN53555_VENDOR_FAIRCHILD
}, {
.compatible = "silergy,syr827",
.data = (void *)FAN53555_VENDOR_SILERGY,
}, {
.compatible = "silergy,syr828",
.data = (void *)FAN53555_VENDOR_SILERGY,
},
{ }
};
MODULE_DEVICE_TABLE(of, fan53555_dt_ids);
static int fan53555_regulator_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct device_node *np = client->dev.of_node;
struct fan53555_device_info *di;
struct fan53555_platform_data *pdata;
struct regulator_config config = { };
unsigned int val;
int ret;
di = devm_kzalloc(&client->dev, sizeof(struct fan53555_device_info),
GFP_KERNEL);
if (!di)
return -ENOMEM;
pdata = dev_get_platdata(&client->dev);
if (!pdata)
pdata = fan53555_parse_dt(&client->dev, np, &di->desc);
if (!pdata || !pdata->regulator) {
dev_err(&client->dev, "Platform data not found!\n");
return -ENODEV;
}
di->regulator = pdata->regulator;
if (client->dev.of_node) {
const struct of_device_id *match;
match = of_match_device(of_match_ptr(fan53555_dt_ids),
&client->dev);
if (!match)
return -ENODEV;
di->vendor = (unsigned long) match->data;
} else {
/* if no ramp constraint set, get the pdata ramp_delay */
if (!di->regulator->constraints.ramp_delay) {
int slew_idx = (pdata->slew_rate & 0x7)
? pdata->slew_rate : 0;
di->regulator->constraints.ramp_delay
= slew_rates[slew_idx];
}
di->vendor = id->driver_data;
}
di->regmap = devm_regmap_init_i2c(client, &fan53555_regmap_config);
if (IS_ERR(di->regmap)) {
dev_err(&client->dev, "Failed to allocate regmap!\n");
return PTR_ERR(di->regmap);
}
di->dev = &client->dev;
i2c_set_clientdata(client, di);
/* Get chip ID */
ret = regmap_read(di->regmap, FAN53555_ID1, &val);
if (ret < 0) {
dev_err(&client->dev, "Failed to get chip ID!\n");
return ret;
}
di->chip_id = val & DIE_ID;
/* Get chip revision */
ret = regmap_read(di->regmap, FAN53555_ID2, &val);
if (ret < 0) {
dev_err(&client->dev, "Failed to get chip Rev!\n");
return ret;
}
di->chip_rev = val & DIE_REV;
dev_info(&client->dev, "FAN53555 Option[%d] Rev[%d] Detected!\n",
di->chip_id, di->chip_rev);
/* Device init */
ret = fan53555_device_setup(di, pdata);
if (ret < 0) {
dev_err(&client->dev, "Failed to setup device!\n");
return ret;
}
/* Register regulator */
config.dev = di->dev;
config.init_data = di->regulator;
config.regmap = di->regmap;
config.driver_data = di;
config.of_node = np;
ret = fan53555_regulator_register(di, &config);
if (ret < 0)
dev_err(&client->dev, "Failed to register regulator!\n");
return ret;
}
static const struct i2c_device_id fan53555_id[] = {
{
.name = "fan53555",
.driver_data = FAN53555_VENDOR_FAIRCHILD
}, {
.name = "syr82x",
.driver_data = FAN53555_VENDOR_SILERGY
},
{ },
};
MODULE_DEVICE_TABLE(i2c, fan53555_id);
static struct i2c_driver fan53555_regulator_driver = {
.driver = {
.name = "fan53555-regulator",
.of_match_table = of_match_ptr(fan53555_dt_ids),
},
.probe = fan53555_regulator_probe,
.id_table = fan53555_id,
};
module_i2c_driver(fan53555_regulator_driver);
MODULE_AUTHOR("Yunfan Zhang <yfzhang@marvell.com>");
MODULE_DESCRIPTION("FAN53555 regulator driver");
MODULE_LICENSE("GPL v2");
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