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u-boot/drivers/power/regulator/regulator-uclass.c
John Keeping 8edf7ac09f power: regulator: fix autoset error handling 
If a regulator does not support .set_suspend_enable or
.set_suspend_value then ret is set to ENOSYS early in the function.

The most serious impact of this is that when no automatic setting of
voltage is needed then the final regulator_set_enable() is skipped
because ret has not been cleared.

It seems that the error handling for regulator_set_suspend_value() is
also wrong as if this succeeds then the normal boot-on checks are still
required, and again ENOSYS needs special treatment here.

Fixes: 11406b8f7e ("dm: regulator: support regulator more state")
Signed-off-by: John Keeping <john@metanate.com>
2022-10-26 11:47:12 +09:00

550 lines
13 KiB
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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (C) 2014-2015 Samsung Electronics
* Przemyslaw Marczak <p.marczak@samsung.com>
*/
#define LOG_CATEGORY UCLASS_REGULATOR
#include <common.h>
#include <errno.h>
#include <dm.h>
#include <log.h>
#include <dm/uclass-internal.h>
#include <linux/delay.h>
#include <power/pmic.h>
#include <power/regulator.h>
int regulator_mode(struct udevice *dev, struct dm_regulator_mode **modep)
{
struct dm_regulator_uclass_plat *uc_pdata;
*modep = NULL;
uc_pdata = dev_get_uclass_plat(dev);
if (!uc_pdata)
return -ENXIO;
*modep = uc_pdata->mode;
return uc_pdata->mode_count;
}
int regulator_get_value(struct udevice *dev)
{
const struct dm_regulator_ops *ops = dev_get_driver_ops(dev);
if (!ops || !ops->get_value)
return -ENOSYS;
return ops->get_value(dev);
}
static void regulator_set_value_ramp_delay(struct udevice *dev, int old_uV,
int new_uV, unsigned int ramp_delay)
{
int delay = DIV_ROUND_UP(abs(new_uV - old_uV), ramp_delay);
debug("regulator %s: delay %u us (%d uV -> %d uV)\n", dev->name, delay,
old_uV, new_uV);
udelay(delay);
}
int regulator_set_value(struct udevice *dev, int uV)
{
const struct dm_regulator_ops *ops = dev_get_driver_ops(dev);
struct dm_regulator_uclass_plat *uc_pdata;
int ret, old_uV = uV, is_enabled = 0;
uc_pdata = dev_get_uclass_plat(dev);
if (uc_pdata->min_uV != -ENODATA && uV < uc_pdata->min_uV)
return -EINVAL;
if (uc_pdata->max_uV != -ENODATA && uV > uc_pdata->max_uV)
return -EINVAL;
if (!ops || !ops->set_value)
return -ENOSYS;
if (uc_pdata->ramp_delay) {
is_enabled = regulator_get_enable(dev);
old_uV = regulator_get_value(dev);
}
ret = ops->set_value(dev, uV);
if (!ret) {
if (uc_pdata->ramp_delay && old_uV > 0 && is_enabled)
regulator_set_value_ramp_delay(dev, old_uV, uV,
uc_pdata->ramp_delay);
}
return ret;
}
int regulator_set_suspend_value(struct udevice *dev, int uV)
{
const struct dm_regulator_ops *ops = dev_get_driver_ops(dev);
struct dm_regulator_uclass_plat *uc_pdata;
uc_pdata = dev_get_uclass_plat(dev);
if (uc_pdata->min_uV != -ENODATA && uV < uc_pdata->min_uV)
return -EINVAL;
if (uc_pdata->max_uV != -ENODATA && uV > uc_pdata->max_uV)
return -EINVAL;
if (!ops->set_suspend_value)
return -ENOSYS;
return ops->set_suspend_value(dev, uV);
}
int regulator_get_suspend_value(struct udevice *dev)
{
const struct dm_regulator_ops *ops = dev_get_driver_ops(dev);
if (!ops->get_suspend_value)
return -ENOSYS;
return ops->get_suspend_value(dev);
}
/*
* To be called with at most caution as there is no check
* before setting the actual voltage value.
*/
int regulator_set_value_force(struct udevice *dev, int uV)
{
const struct dm_regulator_ops *ops = dev_get_driver_ops(dev);
if (!ops || !ops->set_value)
return -ENOSYS;
return ops->set_value(dev, uV);
}
int regulator_get_current(struct udevice *dev)
{
const struct dm_regulator_ops *ops = dev_get_driver_ops(dev);
if (!ops || !ops->get_current)
return -ENOSYS;
return ops->get_current(dev);
}
int regulator_set_current(struct udevice *dev, int uA)
{
const struct dm_regulator_ops *ops = dev_get_driver_ops(dev);
struct dm_regulator_uclass_plat *uc_pdata;
uc_pdata = dev_get_uclass_plat(dev);
if (uc_pdata->min_uA != -ENODATA && uA < uc_pdata->min_uA)
return -EINVAL;
if (uc_pdata->max_uA != -ENODATA && uA > uc_pdata->max_uA)
return -EINVAL;
if (!ops || !ops->set_current)
return -ENOSYS;
return ops->set_current(dev, uA);
}
int regulator_get_enable(struct udevice *dev)
{
const struct dm_regulator_ops *ops = dev_get_driver_ops(dev);
if (!ops || !ops->get_enable)
return -ENOSYS;
return ops->get_enable(dev);
}
int regulator_set_enable(struct udevice *dev, bool enable)
{
const struct dm_regulator_ops *ops = dev_get_driver_ops(dev);
struct dm_regulator_uclass_plat *uc_pdata;
int ret, old_enable = 0;
if (!ops || !ops->set_enable)
return -ENOSYS;
uc_pdata = dev_get_uclass_plat(dev);
if (!enable && uc_pdata->always_on)
return -EACCES;
if (uc_pdata->ramp_delay)
old_enable = regulator_get_enable(dev);
ret = ops->set_enable(dev, enable);
if (!ret) {
if (uc_pdata->ramp_delay && !old_enable && enable) {
int uV = regulator_get_value(dev);
if (uV > 0) {
regulator_set_value_ramp_delay(dev, 0, uV,
uc_pdata->ramp_delay);
}
}
}
return ret;
}
int regulator_set_enable_if_allowed(struct udevice *dev, bool enable)
{
int ret;
ret = regulator_set_enable(dev, enable);
if (ret == -ENOSYS || ret == -EACCES)
return 0;
return ret;
}
int regulator_set_suspend_enable(struct udevice *dev, bool enable)
{
const struct dm_regulator_ops *ops = dev_get_driver_ops(dev);
if (!ops->set_suspend_enable)
return -ENOSYS;
return ops->set_suspend_enable(dev, enable);
}
int regulator_get_suspend_enable(struct udevice *dev)
{
const struct dm_regulator_ops *ops = dev_get_driver_ops(dev);
if (!ops->get_suspend_enable)
return -ENOSYS;
return ops->get_suspend_enable(dev);
}
int regulator_get_mode(struct udevice *dev)
{
const struct dm_regulator_ops *ops = dev_get_driver_ops(dev);
if (!ops || !ops->get_mode)
return -ENOSYS;
return ops->get_mode(dev);
}
int regulator_set_mode(struct udevice *dev, int mode)
{
const struct dm_regulator_ops *ops = dev_get_driver_ops(dev);
if (!ops || !ops->set_mode)
return -ENOSYS;
return ops->set_mode(dev, mode);
}
int regulator_get_by_platname(const char *plat_name, struct udevice **devp)
{
struct dm_regulator_uclass_plat *uc_pdata;
struct udevice *dev;
int ret;
*devp = NULL;
for (ret = uclass_find_first_device(UCLASS_REGULATOR, &dev); dev;
ret = uclass_find_next_device(&dev)) {
if (ret) {
debug("regulator %s, ret=%d\n", dev->name, ret);
continue;
}
uc_pdata = dev_get_uclass_plat(dev);
if (!uc_pdata || strcmp(plat_name, uc_pdata->name))
continue;
return uclass_get_device_tail(dev, 0, devp);
}
debug("%s: can't find: %s, ret=%d\n", __func__, plat_name, ret);
return -ENODEV;
}
int regulator_get_by_devname(const char *devname, struct udevice **devp)
{
return uclass_get_device_by_name(UCLASS_REGULATOR, devname, devp);
}
int device_get_supply_regulator(struct udevice *dev, const char *supply_name,
struct udevice **devp)
{
return uclass_get_device_by_phandle(UCLASS_REGULATOR, dev,
supply_name, devp);
}
int regulator_autoset(struct udevice *dev)
{
struct dm_regulator_uclass_plat *uc_pdata;
int ret = 0;
uc_pdata = dev_get_uclass_plat(dev);
ret = regulator_set_suspend_enable(dev, uc_pdata->suspend_on);
if (ret == -ENOSYS)
ret = 0;
if (!ret && uc_pdata->suspend_on) {
ret = regulator_set_suspend_value(dev, uc_pdata->suspend_uV);
if (ret == -ENOSYS)
ret = 0;
if (ret)
return ret;
}
if (!uc_pdata->always_on && !uc_pdata->boot_on)
return -EMEDIUMTYPE;
if (uc_pdata->type == REGULATOR_TYPE_FIXED)
return regulator_set_enable(dev, true);
if (uc_pdata->flags & REGULATOR_FLAG_AUTOSET_UV)
ret = regulator_set_value(dev, uc_pdata->min_uV);
if (uc_pdata->init_uV > 0)
ret = regulator_set_value(dev, uc_pdata->init_uV);
if (!ret && (uc_pdata->flags & REGULATOR_FLAG_AUTOSET_UA))
ret = regulator_set_current(dev, uc_pdata->min_uA);
if (!ret)
ret = regulator_set_enable(dev, true);
return ret;
}
int regulator_unset(struct udevice *dev)
{
struct dm_regulator_uclass_plat *uc_pdata;
uc_pdata = dev_get_uclass_plat(dev);
if (uc_pdata && uc_pdata->force_off)
return regulator_set_enable(dev, false);
return -EMEDIUMTYPE;
}
static void regulator_show(struct udevice *dev, int ret)
{
struct dm_regulator_uclass_plat *uc_pdata;
uc_pdata = dev_get_uclass_plat(dev);
printf("%s@%s: ", dev->name, uc_pdata->name);
if (uc_pdata->flags & REGULATOR_FLAG_AUTOSET_UV)
printf("set %d uV", uc_pdata->min_uV);
if (uc_pdata->flags & REGULATOR_FLAG_AUTOSET_UA)
printf("; set %d uA", uc_pdata->min_uA);
printf("; enabling");
if (ret)
printf(" (ret: %d)", ret);
printf("\n");
}
int regulator_autoset_by_name(const char *platname, struct udevice **devp)
{
struct udevice *dev;
int ret;
ret = regulator_get_by_platname(platname, &dev);
if (devp)
*devp = dev;
if (ret) {
debug("Can get the regulator: %s (err=%d)\n", platname, ret);
return ret;
}
return regulator_autoset(dev);
}
int regulator_list_autoset(const char *list_platname[],
struct udevice *list_devp[],
bool verbose)
{
struct udevice *dev;
int error = 0, i = 0, ret;
while (list_platname[i]) {
ret = regulator_autoset_by_name(list_platname[i], &dev);
if (ret != -EMEDIUMTYPE && verbose)
regulator_show(dev, ret);
if (ret & !error)
error = ret;
if (list_devp)
list_devp[i] = dev;
i++;
}
return error;
}
static bool regulator_name_is_unique(struct udevice *check_dev,
const char *check_name)
{
struct dm_regulator_uclass_plat *uc_pdata;
struct udevice *dev;
int check_len = strlen(check_name);
int ret;
int len;
for (ret = uclass_find_first_device(UCLASS_REGULATOR, &dev); dev;
ret = uclass_find_next_device(&dev)) {
if (ret || dev == check_dev)
continue;
uc_pdata = dev_get_uclass_plat(dev);
len = strlen(uc_pdata->name);
if (len != check_len)
continue;
if (!strcmp(uc_pdata->name, check_name))
return false;
}
return true;
}
static int regulator_post_bind(struct udevice *dev)
{
struct dm_regulator_uclass_plat *uc_pdata;
const char *property = "regulator-name";
uc_pdata = dev_get_uclass_plat(dev);
/* Regulator's mandatory constraint */
uc_pdata->name = dev_read_string(dev, property);
if (!uc_pdata->name) {
debug("%s: dev '%s' has no property '%s'\n",
__func__, dev->name, property);
uc_pdata->name = dev_read_name(dev);
if (!uc_pdata->name)
return -EINVAL;
}
if (regulator_name_is_unique(dev, uc_pdata->name))
return 0;
debug("'%s' of dev: '%s', has nonunique value: '%s\n",
property, dev->name, uc_pdata->name);
return -EINVAL;
}
static int regulator_pre_probe(struct udevice *dev)
{
struct dm_regulator_uclass_plat *uc_pdata;
ofnode node;
uc_pdata = dev_get_uclass_plat(dev);
if (!uc_pdata)
return -ENXIO;
/* Regulator's optional constraints */
uc_pdata->min_uV = dev_read_u32_default(dev, "regulator-min-microvolt",
-ENODATA);
uc_pdata->max_uV = dev_read_u32_default(dev, "regulator-max-microvolt",
-ENODATA);
uc_pdata->init_uV = dev_read_u32_default(dev, "regulator-init-microvolt",
-ENODATA);
uc_pdata->min_uA = dev_read_u32_default(dev, "regulator-min-microamp",
-ENODATA);
uc_pdata->max_uA = dev_read_u32_default(dev, "regulator-max-microamp",
-ENODATA);
uc_pdata->always_on = dev_read_bool(dev, "regulator-always-on");
uc_pdata->boot_on = dev_read_bool(dev, "regulator-boot-on");
uc_pdata->ramp_delay = dev_read_u32_default(dev, "regulator-ramp-delay",
0);
uc_pdata->force_off = dev_read_bool(dev, "regulator-force-boot-off");
node = dev_read_subnode(dev, "regulator-state-mem");
if (ofnode_valid(node)) {
uc_pdata->suspend_on = !ofnode_read_bool(node, "regulator-off-in-suspend");
if (ofnode_read_u32(node, "regulator-suspend-microvolt", &uc_pdata->suspend_uV))
uc_pdata->suspend_uV = uc_pdata->max_uV;
} else {
uc_pdata->suspend_on = true;
uc_pdata->suspend_uV = uc_pdata->max_uV;
}
/* Those values are optional (-ENODATA if unset) */
if ((uc_pdata->min_uV != -ENODATA) &&
(uc_pdata->max_uV != -ENODATA) &&
(uc_pdata->min_uV == uc_pdata->max_uV))
uc_pdata->flags |= REGULATOR_FLAG_AUTOSET_UV;
/* Those values are optional (-ENODATA if unset) */
if ((uc_pdata->min_uA != -ENODATA) &&
(uc_pdata->max_uA != -ENODATA) &&
(uc_pdata->min_uA == uc_pdata->max_uA))
uc_pdata->flags |= REGULATOR_FLAG_AUTOSET_UA;
return 0;
}
int regulators_enable_boot_on(bool verbose)
{
struct udevice *dev;
struct uclass *uc;
int ret;
ret = uclass_get(UCLASS_REGULATOR, &uc);
if (ret)
return ret;
for (uclass_first_device(UCLASS_REGULATOR, &dev);
dev;
uclass_next_device(&dev)) {
ret = regulator_autoset(dev);
if (ret == -EMEDIUMTYPE) {
ret = 0;
continue;
}
if (verbose)
regulator_show(dev, ret);
if (ret == -ENOSYS)
ret = 0;
}
return ret;
}
int regulators_enable_boot_off(bool verbose)
{
struct udevice *dev;
struct uclass *uc;
int ret;
ret = uclass_get(UCLASS_REGULATOR, &uc);
if (ret)
return ret;
for (uclass_first_device(UCLASS_REGULATOR, &dev);
dev;
uclass_next_device(&dev)) {
ret = regulator_unset(dev);
if (ret == -EMEDIUMTYPE) {
ret = 0;
continue;
}
if (verbose)
regulator_show(dev, ret);
if (ret == -ENOSYS)
ret = 0;
}
return ret;
}
UCLASS_DRIVER(regulator) = {
.id = UCLASS_REGULATOR,
.name = "regulator",
.post_bind = regulator_post_bind,
.pre_probe = regulator_pre_probe,
.per_device_plat_auto = sizeof(struct dm_regulator_uclass_plat),
};
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