u-boot/drivers/power/regulator/gpio-regulator.c
Tom Rini 83d290c56f SPDX: Convert all of our single license tags to Linux Kernel style
When U-Boot started using SPDX tags we were among the early adopters and
there weren't a lot of other examples to borrow from.  So we picked the
area of the file that usually had a full license text and replaced it
with an appropriate SPDX-License-Identifier: entry.  Since then, the
Linux Kernel has adopted SPDX tags and they place it as the very first
line in a file (except where shebangs are used, then it's second line)
and with slightly different comment styles than us.

In part due to community overlap, in part due to better tag visibility
and in part for other minor reasons, switch over to that style.

This commit changes all instances where we have a single declared
license in the tag as both the before and after are identical in tag
contents.  There's also a few places where I found we did not have a tag
and have introduced one.

Signed-off-by: Tom Rini <trini@konsulko.com>
2018-05-07 09:34:12 -04:00

136 lines
3.2 KiB
C

// SPDX-License-Identifier: GPL-2.0+
/*
* (C) Copyright 2016 Texas Instruments Incorporated, <www.ti.com>
* Keerthy <j-keerthy@ti.com>
*/
#include <common.h>
#include <fdtdec.h>
#include <errno.h>
#include <dm.h>
#include <i2c.h>
#include <asm/gpio.h>
#include <power/pmic.h>
#include <power/regulator.h>
#define GPIO_REGULATOR_MAX_STATES 2
DECLARE_GLOBAL_DATA_PTR;
struct gpio_regulator_platdata {
struct gpio_desc gpio; /* GPIO for regulator voltage control */
int states[GPIO_REGULATOR_MAX_STATES];
int voltages[GPIO_REGULATOR_MAX_STATES];
};
static int gpio_regulator_ofdata_to_platdata(struct udevice *dev)
{
struct dm_regulator_uclass_platdata *uc_pdata;
struct gpio_regulator_platdata *dev_pdata;
struct gpio_desc *gpio;
const void *blob = gd->fdt_blob;
int node = dev_of_offset(dev);
int ret, count, i, j;
u32 states_array[8];
dev_pdata = dev_get_platdata(dev);
uc_pdata = dev_get_uclass_platdata(dev);
if (!uc_pdata)
return -ENXIO;
/* Set type to gpio */
uc_pdata->type = REGULATOR_TYPE_GPIO;
/*
* Get gpio regulator gpio desc
* Assuming one GPIO per regulator.
* Can be extended later to multiple GPIOs
* per gpio-regulator. As of now no instance with multiple
* gpios is presnt
*/
gpio = &dev_pdata->gpio;
ret = gpio_request_by_name(dev, "gpios", 0, gpio, GPIOD_IS_OUT);
if (ret)
debug("regulator gpio - not found! Error: %d", ret);
count = fdtdec_get_int_array_count(blob, node, "states",
states_array, 8);
if (!count)
return -EINVAL;
for (i = 0, j = 0; i < count; i += 2) {
dev_pdata->voltages[j] = states_array[i];
dev_pdata->states[j] = states_array[i + 1];
j++;
}
return 0;
}
static int gpio_regulator_get_value(struct udevice *dev)
{
struct dm_regulator_uclass_platdata *uc_pdata;
struct gpio_regulator_platdata *dev_pdata = dev_get_platdata(dev);
int enable;
if (!dev_pdata->gpio.dev)
return -ENOSYS;
uc_pdata = dev_get_uclass_platdata(dev);
if (uc_pdata->min_uV > uc_pdata->max_uV) {
debug("Invalid constraints for: %s\n", uc_pdata->name);
return -EINVAL;
}
enable = dm_gpio_get_value(&dev_pdata->gpio);
if (enable == dev_pdata->states[0])
return dev_pdata->voltages[0];
else
return dev_pdata->voltages[1];
}
static int gpio_regulator_set_value(struct udevice *dev, int uV)
{
struct gpio_regulator_platdata *dev_pdata = dev_get_platdata(dev);
int ret;
bool enable;
if (!dev_pdata->gpio.dev)
return -ENOSYS;
if (uV == dev_pdata->voltages[0])
enable = dev_pdata->states[0];
else if (uV == dev_pdata->voltages[1])
enable = dev_pdata->states[1];
else
return -EINVAL;
ret = dm_gpio_set_value(&dev_pdata->gpio, enable);
if (ret) {
pr_err("Can't set regulator : %s gpio to: %d\n", dev->name,
enable);
return ret;
}
return 0;
}
static const struct dm_regulator_ops gpio_regulator_ops = {
.get_value = gpio_regulator_get_value,
.set_value = gpio_regulator_set_value,
};
static const struct udevice_id gpio_regulator_ids[] = {
{ .compatible = "regulator-gpio" },
{ },
};
U_BOOT_DRIVER(gpio_regulator) = {
.name = "gpio regulator",
.id = UCLASS_REGULATOR,
.ops = &gpio_regulator_ops,
.of_match = gpio_regulator_ids,
.ofdata_to_platdata = gpio_regulator_ofdata_to_platdata,
.platdata_auto_alloc_size = sizeof(struct gpio_regulator_platdata),
};