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linux/drivers/regulator/rk808-regulator.c
Uwe Kleine-König a13eaf02e2 regulator: rk808: make better use of the gpiod API 
The gpiod functions include variants for managed gpiod resources. Use it
to simplify the remove function.

As the driver handles a device node without a specification of dvs gpios
just fine, additionally use the variant of gpiod_get exactly for this
use case. This makes error checking more strict.

As a third benefit this patch makes the driver use the flags parameter
of gpiod_get* which will not be optional any more after 4.2 and so
prevents a build failure when the respective gpiod commit is merged.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Mark Brown <broonie@kernel.org>
2015-07-21 17:11:30 +01:00

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/*
* Regulator driver for Rockchip RK808
*
* Copyright (c) 2014, Fuzhou Rockchip Electronics Co., Ltd
*
* Author: Chris Zhong <zyw@rock-chips.com>
* Author: Zhang Qing <zhangqing@rock-chips.com>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope 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.
*/
#include <linux/delay.h>
#include <linux/gpio.h>
#include <linux/i2c.h>
#include <linux/module.h>
#include <linux/of_device.h>
#include <linux/of_gpio.h>
#include <linux/mfd/rk808.h>
#include <linux/regulator/driver.h>
#include <linux/regulator/of_regulator.h>
#include <linux/gpio/consumer.h>
/* Field Definitions */
#define RK808_BUCK_VSEL_MASK 0x3f
#define RK808_BUCK4_VSEL_MASK 0xf
#define RK808_LDO_VSEL_MASK 0x1f
/* Ramp rate definitions for buck1 / buck2 only */
#define RK808_RAMP_RATE_OFFSET 3
#define RK808_RAMP_RATE_MASK (3 << RK808_RAMP_RATE_OFFSET)
#define RK808_RAMP_RATE_2MV_PER_US (0 << RK808_RAMP_RATE_OFFSET)
#define RK808_RAMP_RATE_4MV_PER_US (1 << RK808_RAMP_RATE_OFFSET)
#define RK808_RAMP_RATE_6MV_PER_US (2 << RK808_RAMP_RATE_OFFSET)
#define RK808_RAMP_RATE_10MV_PER_US (3 << RK808_RAMP_RATE_OFFSET)
#define RK808_DVS2_POL BIT(2)
#define RK808_DVS1_POL BIT(1)
/* Offset from XXX_ON_VSEL to XXX_SLP_VSEL */
#define RK808_SLP_REG_OFFSET 1
/* Offset from XXX_ON_VSEL to XXX_DVS_VSEL */
#define RK808_DVS_REG_OFFSET 2
/* Offset from XXX_EN_REG to SLEEP_SET_OFF_XXX */
#define RK808_SLP_SET_OFF_REG_OFFSET 2
/* max steps for increase voltage of Buck1/2, equal 100mv*/
#define MAX_STEPS_ONE_TIME 8
struct rk808_regulator_data {
struct gpio_desc *dvs_gpio[2];
};
static const int rk808_buck_config_regs[] = {
RK808_BUCK1_CONFIG_REG,
RK808_BUCK2_CONFIG_REG,
RK808_BUCK3_CONFIG_REG,
RK808_BUCK4_CONFIG_REG,
};
static const struct regulator_linear_range rk808_buck_voltage_ranges[] = {
REGULATOR_LINEAR_RANGE(712500, 0, 63, 12500),
};
static const struct regulator_linear_range rk808_buck4_voltage_ranges[] = {
REGULATOR_LINEAR_RANGE(1800000, 0, 15, 100000),
};
static const struct regulator_linear_range rk808_ldo_voltage_ranges[] = {
REGULATOR_LINEAR_RANGE(1800000, 0, 16, 100000),
};
static const struct regulator_linear_range rk808_ldo3_voltage_ranges[] = {
REGULATOR_LINEAR_RANGE(800000, 0, 13, 100000),
REGULATOR_LINEAR_RANGE(2500000, 15, 15, 0),
};
static const struct regulator_linear_range rk808_ldo6_voltage_ranges[] = {
REGULATOR_LINEAR_RANGE(800000, 0, 17, 100000),
};
static int rk808_buck1_2_get_voltage_sel_regmap(struct regulator_dev *rdev)
{
struct rk808_regulator_data *pdata = rdev_get_drvdata(rdev);
int id = rdev->desc->id - RK808_ID_DCDC1;
struct gpio_desc *gpio = pdata->dvs_gpio[id];
unsigned int val;
int ret;
if (!gpio || gpiod_get_value(gpio) == 0)
return regulator_get_voltage_sel_regmap(rdev);
ret = regmap_read(rdev->regmap,
rdev->desc->vsel_reg + RK808_DVS_REG_OFFSET,
&val);
if (ret != 0)
return ret;
val &= rdev->desc->vsel_mask;
val >>= ffs(rdev->desc->vsel_mask) - 1;
return val;
}
static int rk808_buck1_2_i2c_set_voltage_sel(struct regulator_dev *rdev,
unsigned sel)
{
int ret, delta_sel;
unsigned int old_sel, tmp, val, mask = rdev->desc->vsel_mask;
ret = regmap_read(rdev->regmap, rdev->desc->vsel_reg, &val);
if (ret != 0)
return ret;
tmp = val & ~mask;
old_sel = val & mask;
old_sel >>= ffs(mask) - 1;
delta_sel = sel - old_sel;
/*
* If directly modify the register to change the voltage, we will face
* the risk of overshoot. Put it into a multi-step, can effectively
* avoid this problem, a step is 100mv here.
*/
while (delta_sel > MAX_STEPS_ONE_TIME) {
old_sel += MAX_STEPS_ONE_TIME;
val = old_sel << (ffs(mask) - 1);
val |= tmp;
/*
* i2c is 400kHz (2.5us per bit) and we must transmit _at least_
* 3 bytes (24 bits) plus start and stop so 26 bits. So we've
* got more than 65 us between each voltage change and thus
* won't ramp faster than ~1500 uV / us.
*/
ret = regmap_write(rdev->regmap, rdev->desc->vsel_reg, val);
delta_sel = sel - old_sel;
}
sel <<= ffs(mask) - 1;
val = tmp | sel;
ret = regmap_write(rdev->regmap, rdev->desc->vsel_reg, val);
/*
* When we change the voltage register directly, the ramp rate is about
* 100000uv/us, wait 1us to make sure the target voltage to be stable,
* so we needn't wait extra time after that.
*/
udelay(1);
return ret;
}
static int rk808_buck1_2_set_voltage_sel(struct regulator_dev *rdev,
unsigned sel)
{
struct rk808_regulator_data *pdata = rdev_get_drvdata(rdev);
int id = rdev->desc->id - RK808_ID_DCDC1;
struct gpio_desc *gpio = pdata->dvs_gpio[id];
unsigned int reg = rdev->desc->vsel_reg;
unsigned old_sel;
int ret, gpio_level;
if (!gpio)
return rk808_buck1_2_i2c_set_voltage_sel(rdev, sel);
gpio_level = gpiod_get_value(gpio);
if (gpio_level == 0) {
reg += RK808_DVS_REG_OFFSET;
ret = regmap_read(rdev->regmap, rdev->desc->vsel_reg, &old_sel);
} else {
ret = regmap_read(rdev->regmap,
reg + RK808_DVS_REG_OFFSET,
&old_sel);
}
if (ret != 0)
return ret;
sel <<= ffs(rdev->desc->vsel_mask) - 1;
sel |= old_sel & ~rdev->desc->vsel_mask;
ret = regmap_write(rdev->regmap, reg, sel);
if (ret)
return ret;
gpiod_set_value(gpio, !gpio_level);
return ret;
}
static int rk808_buck1_2_set_voltage_time_sel(struct regulator_dev *rdev,
unsigned int old_selector,
unsigned int new_selector)
{
struct rk808_regulator_data *pdata = rdev_get_drvdata(rdev);
int id = rdev->desc->id - RK808_ID_DCDC1;
struct gpio_desc *gpio = pdata->dvs_gpio[id];
/* if there is no dvs1/2 pin, we don't need wait extra time here. */
if (!gpio)
return 0;
return regulator_set_voltage_time_sel(rdev, old_selector, new_selector);
}
static int rk808_set_ramp_delay(struct regulator_dev *rdev, int ramp_delay)
{
unsigned int ramp_value = RK808_RAMP_RATE_10MV_PER_US;
unsigned int reg = rk808_buck_config_regs[rdev->desc->id -
RK808_ID_DCDC1];
switch (ramp_delay) {
case 1 ... 2000:
ramp_value = RK808_RAMP_RATE_2MV_PER_US;
break;
case 2001 ... 4000:
ramp_value = RK808_RAMP_RATE_4MV_PER_US;
break;
case 4001 ... 6000:
ramp_value = RK808_RAMP_RATE_6MV_PER_US;
break;
case 6001 ... 10000:
break;
default:
pr_warn("%s ramp_delay: %d not supported, setting 10000\n",
rdev->desc->name, ramp_delay);
}
return regmap_update_bits(rdev->regmap, reg,
RK808_RAMP_RATE_MASK, ramp_value);
}
static int rk808_set_suspend_voltage(struct regulator_dev *rdev, int uv)
{
unsigned int reg;
int sel = regulator_map_voltage_linear_range(rdev, uv, uv);
if (sel < 0)
return -EINVAL;
reg = rdev->desc->vsel_reg + RK808_SLP_REG_OFFSET;
return regmap_update_bits(rdev->regmap, reg,
rdev->desc->vsel_mask,
sel);
}
static int rk808_set_suspend_enable(struct regulator_dev *rdev)
{
unsigned int reg;
reg = rdev->desc->enable_reg + RK808_SLP_SET_OFF_REG_OFFSET;
return regmap_update_bits(rdev->regmap, reg,
rdev->desc->enable_mask,
0);
}
static int rk808_set_suspend_disable(struct regulator_dev *rdev)
{
unsigned int reg;
reg = rdev->desc->enable_reg + RK808_SLP_SET_OFF_REG_OFFSET;
return regmap_update_bits(rdev->regmap, reg,
rdev->desc->enable_mask,
rdev->desc->enable_mask);
}
static struct regulator_ops rk808_buck1_2_ops = {
.list_voltage = regulator_list_voltage_linear_range,
.map_voltage = regulator_map_voltage_linear_range,
.get_voltage_sel = rk808_buck1_2_get_voltage_sel_regmap,
.set_voltage_sel = rk808_buck1_2_set_voltage_sel,
.set_voltage_time_sel = rk808_buck1_2_set_voltage_time_sel,
.enable = regulator_enable_regmap,
.disable = regulator_disable_regmap,
.is_enabled = regulator_is_enabled_regmap,
.set_ramp_delay = rk808_set_ramp_delay,
.set_suspend_voltage = rk808_set_suspend_voltage,
.set_suspend_enable = rk808_set_suspend_enable,
.set_suspend_disable = rk808_set_suspend_disable,
};
static struct regulator_ops rk808_reg_ops = {
.list_voltage = regulator_list_voltage_linear_range,
.map_voltage = regulator_map_voltage_linear_range,
.get_voltage_sel = regulator_get_voltage_sel_regmap,
.set_voltage_sel = regulator_set_voltage_sel_regmap,
.enable = regulator_enable_regmap,
.disable = regulator_disable_regmap,
.is_enabled = regulator_is_enabled_regmap,
.set_suspend_voltage = rk808_set_suspend_voltage,
.set_suspend_enable = rk808_set_suspend_enable,
.set_suspend_disable = rk808_set_suspend_disable,
};
static struct regulator_ops rk808_switch_ops = {
.enable = regulator_enable_regmap,
.disable = regulator_disable_regmap,
.is_enabled = regulator_is_enabled_regmap,
.set_suspend_enable = rk808_set_suspend_enable,
.set_suspend_disable = rk808_set_suspend_disable,
};
static const struct regulator_desc rk808_reg[] = {
{
.name = "DCDC_REG1",
.supply_name = "vcc1",
.id = RK808_ID_DCDC1,
.ops = &rk808_buck1_2_ops,
.type = REGULATOR_VOLTAGE,
.n_voltages = 64,
.linear_ranges = rk808_buck_voltage_ranges,
.n_linear_ranges = ARRAY_SIZE(rk808_buck_voltage_ranges),
.vsel_reg = RK808_BUCK1_ON_VSEL_REG,
.vsel_mask = RK808_BUCK_VSEL_MASK,
.enable_reg = RK808_DCDC_EN_REG,
.enable_mask = BIT(0),
.owner = THIS_MODULE,
}, {
.name = "DCDC_REG2",
.supply_name = "vcc2",
.id = RK808_ID_DCDC2,
.ops = &rk808_buck1_2_ops,
.type = REGULATOR_VOLTAGE,
.n_voltages = 64,
.linear_ranges = rk808_buck_voltage_ranges,
.n_linear_ranges = ARRAY_SIZE(rk808_buck_voltage_ranges),
.vsel_reg = RK808_BUCK2_ON_VSEL_REG,
.vsel_mask = RK808_BUCK_VSEL_MASK,
.enable_reg = RK808_DCDC_EN_REG,
.enable_mask = BIT(1),
.owner = THIS_MODULE,
}, {
.name = "DCDC_REG3",
.supply_name = "vcc3",
.id = RK808_ID_DCDC3,
.ops = &rk808_switch_ops,
.type = REGULATOR_VOLTAGE,
.n_voltages = 1,
.enable_reg = RK808_DCDC_EN_REG,
.enable_mask = BIT(2),
.owner = THIS_MODULE,
}, {
.name = "DCDC_REG4",
.supply_name = "vcc4",
.id = RK808_ID_DCDC4,
.ops = &rk808_reg_ops,
.type = REGULATOR_VOLTAGE,
.n_voltages = 16,
.linear_ranges = rk808_buck4_voltage_ranges,
.n_linear_ranges = ARRAY_SIZE(rk808_buck4_voltage_ranges),
.vsel_reg = RK808_BUCK4_ON_VSEL_REG,
.vsel_mask = RK808_BUCK4_VSEL_MASK,
.enable_reg = RK808_DCDC_EN_REG,
.enable_mask = BIT(3),
.owner = THIS_MODULE,
}, {
.name = "LDO_REG1",
.supply_name = "vcc6",
.id = RK808_ID_LDO1,
.ops = &rk808_reg_ops,
.type = REGULATOR_VOLTAGE,
.n_voltages = 17,
.linear_ranges = rk808_ldo_voltage_ranges,
.n_linear_ranges = ARRAY_SIZE(rk808_ldo_voltage_ranges),
.vsel_reg = RK808_LDO1_ON_VSEL_REG,
.vsel_mask = RK808_LDO_VSEL_MASK,
.enable_reg = RK808_LDO_EN_REG,
.enable_mask = BIT(0),
.enable_time = 400,
.owner = THIS_MODULE,
}, {
.name = "LDO_REG2",
.supply_name = "vcc6",
.id = RK808_ID_LDO2,
.ops = &rk808_reg_ops,
.type = REGULATOR_VOLTAGE,
.n_voltages = 17,
.linear_ranges = rk808_ldo_voltage_ranges,
.n_linear_ranges = ARRAY_SIZE(rk808_ldo_voltage_ranges),
.vsel_reg = RK808_LDO2_ON_VSEL_REG,
.vsel_mask = RK808_LDO_VSEL_MASK,
.enable_reg = RK808_LDO_EN_REG,
.enable_mask = BIT(1),
.enable_time = 400,
.owner = THIS_MODULE,
}, {
.name = "LDO_REG3",
.supply_name = "vcc7",
.id = RK808_ID_LDO3,
.ops = &rk808_reg_ops,
.type = REGULATOR_VOLTAGE,
.n_voltages = 16,
.linear_ranges = rk808_ldo3_voltage_ranges,
.n_linear_ranges = ARRAY_SIZE(rk808_ldo3_voltage_ranges),
.vsel_reg = RK808_LDO3_ON_VSEL_REG,
.vsel_mask = RK808_BUCK4_VSEL_MASK,
.enable_reg = RK808_LDO_EN_REG,
.enable_mask = BIT(2),
.enable_time = 400,
.owner = THIS_MODULE,
}, {
.name = "LDO_REG4",
.supply_name = "vcc9",
.id = RK808_ID_LDO4,
.ops = &rk808_reg_ops,
.type = REGULATOR_VOLTAGE,
.n_voltages = 17,
.linear_ranges = rk808_ldo_voltage_ranges,
.n_linear_ranges = ARRAY_SIZE(rk808_ldo_voltage_ranges),
.vsel_reg = RK808_LDO4_ON_VSEL_REG,
.vsel_mask = RK808_LDO_VSEL_MASK,
.enable_reg = RK808_LDO_EN_REG,
.enable_mask = BIT(3),
.enable_time = 400,
.owner = THIS_MODULE,
}, {
.name = "LDO_REG5",
.supply_name = "vcc9",
.id = RK808_ID_LDO5,
.ops = &rk808_reg_ops,
.type = REGULATOR_VOLTAGE,
.n_voltages = 17,
.linear_ranges = rk808_ldo_voltage_ranges,
.n_linear_ranges = ARRAY_SIZE(rk808_ldo_voltage_ranges),
.vsel_reg = RK808_LDO5_ON_VSEL_REG,
.vsel_mask = RK808_LDO_VSEL_MASK,
.enable_reg = RK808_LDO_EN_REG,
.enable_mask = BIT(4),
.enable_time = 400,
.owner = THIS_MODULE,
}, {
.name = "LDO_REG6",
.supply_name = "vcc10",
.id = RK808_ID_LDO6,
.ops = &rk808_reg_ops,
.type = REGULATOR_VOLTAGE,
.n_voltages = 18,
.linear_ranges = rk808_ldo6_voltage_ranges,
.n_linear_ranges = ARRAY_SIZE(rk808_ldo6_voltage_ranges),
.vsel_reg = RK808_LDO6_ON_VSEL_REG,
.vsel_mask = RK808_LDO_VSEL_MASK,
.enable_reg = RK808_LDO_EN_REG,
.enable_mask = BIT(5),
.enable_time = 400,
.owner = THIS_MODULE,
}, {
.name = "LDO_REG7",
.supply_name = "vcc7",
.id = RK808_ID_LDO7,
.ops = &rk808_reg_ops,
.type = REGULATOR_VOLTAGE,
.n_voltages = 18,
.linear_ranges = rk808_ldo6_voltage_ranges,
.n_linear_ranges = ARRAY_SIZE(rk808_ldo6_voltage_ranges),
.vsel_reg = RK808_LDO7_ON_VSEL_REG,
.vsel_mask = RK808_LDO_VSEL_MASK,
.enable_reg = RK808_LDO_EN_REG,
.enable_mask = BIT(6),
.enable_time = 400,
.owner = THIS_MODULE,
}, {
.name = "LDO_REG8",
.supply_name = "vcc11",
.id = RK808_ID_LDO8,
.ops = &rk808_reg_ops,
.type = REGULATOR_VOLTAGE,
.n_voltages = 17,
.linear_ranges = rk808_ldo_voltage_ranges,
.n_linear_ranges = ARRAY_SIZE(rk808_ldo_voltage_ranges),
.vsel_reg = RK808_LDO8_ON_VSEL_REG,
.vsel_mask = RK808_LDO_VSEL_MASK,
.enable_reg = RK808_LDO_EN_REG,
.enable_mask = BIT(7),
.enable_time = 400,
.owner = THIS_MODULE,
}, {
.name = "SWITCH_REG1",
.supply_name = "vcc8",
.id = RK808_ID_SWITCH1,
.ops = &rk808_switch_ops,
.type = REGULATOR_VOLTAGE,
.enable_reg = RK808_DCDC_EN_REG,
.enable_mask = BIT(5),
.owner = THIS_MODULE,
}, {
.name = "SWITCH_REG2",
.supply_name = "vcc12",
.id = RK808_ID_SWITCH2,
.ops = &rk808_switch_ops,
.type = REGULATOR_VOLTAGE,
.enable_reg = RK808_DCDC_EN_REG,
.enable_mask = BIT(6),
.owner = THIS_MODULE,
},
};
static struct of_regulator_match rk808_reg_matches[] = {
[RK808_ID_DCDC1] = { .name = "DCDC_REG1" },
[RK808_ID_DCDC2] = { .name = "DCDC_REG2" },
[RK808_ID_DCDC3] = { .name = "DCDC_REG3" },
[RK808_ID_DCDC4] = { .name = "DCDC_REG4" },
[RK808_ID_LDO1] = { .name = "LDO_REG1" },
[RK808_ID_LDO2] = { .name = "LDO_REG2" },
[RK808_ID_LDO3] = { .name = "LDO_REG3" },
[RK808_ID_LDO4] = { .name = "LDO_REG4" },
[RK808_ID_LDO5] = { .name = "LDO_REG5" },
[RK808_ID_LDO6] = { .name = "LDO_REG6" },
[RK808_ID_LDO7] = { .name = "LDO_REG7" },
[RK808_ID_LDO8] = { .name = "LDO_REG8" },
[RK808_ID_SWITCH1] = { .name = "SWITCH_REG1" },
[RK808_ID_SWITCH2] = { .name = "SWITCH_REG2" },
};
static int rk808_regulator_dt_parse_pdata(struct device *dev,
struct device *client_dev,
struct regmap *map,
struct rk808_regulator_data *pdata)
{
struct device_node *np;
int tmp, ret, i;
np = of_get_child_by_name(client_dev->of_node, "regulators");
if (!np)
return -ENXIO;
ret = of_regulator_match(dev, np, rk808_reg_matches,
RK808_NUM_REGULATORS);
if (ret < 0)
goto dt_parse_end;
for (i = 0; i < ARRAY_SIZE(pdata->dvs_gpio); i++) {
pdata->dvs_gpio[i] =
devm_gpiod_get_index_optional(client_dev, "dvs", i,
GPIOD_OUT_LOW);
if (IS_ERR(pdata->dvs_gpio[i])) {
ret = PTR_ERR(pdata->dvs_gpio[i]);
dev_err(dev, "failed to get dvs%d gpio (%d)\n", i, ret);
goto dt_parse_end;
}
if (!pdata->dvs_gpio[i]) {
dev_warn(dev, "there is no dvs%d gpio\n", i);
continue;
}
tmp = i ? RK808_DVS2_POL : RK808_DVS1_POL;
ret = regmap_update_bits(map, RK808_IO_POL_REG, tmp,
gpiod_is_active_low(pdata->dvs_gpio[i]) ?
0 : tmp);
}
dt_parse_end:
of_node_put(np);
return ret;
}
static int rk808_regulator_probe(struct platform_device *pdev)
{
struct rk808 *rk808 = dev_get_drvdata(pdev->dev.parent);
struct i2c_client *client = rk808->i2c;
struct regulator_config config = {};
struct regulator_dev *rk808_rdev;
struct rk808_regulator_data *pdata;
int ret, i;
pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
if (!pdata)
return -ENOMEM;
ret = rk808_regulator_dt_parse_pdata(&pdev->dev, &client->dev,
rk808->regmap, pdata);
if (ret < 0)
return ret;
platform_set_drvdata(pdev, pdata);
/* Instantiate the regulators */
for (i = 0; i < RK808_NUM_REGULATORS; i++) {
if (!rk808_reg_matches[i].init_data ||
!rk808_reg_matches[i].of_node)
continue;
config.dev = &client->dev;
config.driver_data = pdata;
config.regmap = rk808->regmap;
config.of_node = rk808_reg_matches[i].of_node;
config.init_data = rk808_reg_matches[i].init_data;
rk808_rdev = devm_regulator_register(&pdev->dev,
&rk808_reg[i], &config);
if (IS_ERR(rk808_rdev)) {
dev_err(&client->dev,
"failed to register %d regulator\n", i);
return PTR_ERR(rk808_rdev);
}
}
return 0;
}
static struct platform_driver rk808_regulator_driver = {
.probe = rk808_regulator_probe,
.driver = {
.name = "rk808-regulator",
.owner = THIS_MODULE,
},
};
module_platform_driver(rk808_regulator_driver);
MODULE_DESCRIPTION("regulator driver for the rk808 series PMICs");
MODULE_AUTHOR("Chris Zhong<zyw@rock-chips.com>");
MODULE_AUTHOR("Zhang Qing<zhangqing@rock-chips.com>");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:rk808-regulator");
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