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regulator: Don't return or expect -errno from of_map_mode() 

[ Upstream commit 02f3703934 ]

In of_get_regulation_constraints() we were taking the result of
of_map_mode() (an unsigned int) and assigning it to an int.  We were
then checking whether this value was -EINVAL.  Some implementers of
of_map_mode() were returning -EINVAL (even though the return type of
their function needed to be unsigned int) because they needed to
signal an error back to of_get_regulation_constraints().

In general in the regulator framework the mode is always referred to
as an unsigned int.  While we could fix this to be a signed int (the
highest value we store in there right now is 0x8), it's actually
pretty clean to just define the regulator mode 0x0 (the lack of any
bits set) as an invalid mode.  Let's do that.

Fixes: 5e5e3a42c6 ("regulator: of: Add support for parsing initial and suspend modes")
Suggested-by: Javier Martinez Canillas <javierm@redhat.com>
Signed-off-by: Douglas Anderson <dianders@chromium.org>
Reviewed-by: Javier Martinez Canillas <javierm@redhat.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
pull/10/head
Douglas Anderson 2018-04-18 08:54:18 -07:00 committed by Greg Kroah-Hartman
parent 4886bf0033
commit fb2b60e27a
4 changed files with 10 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/regulator/cpcap-regulator.c
View File

@ -222,7 +222,7 @@ static unsigned int cpcap_map_mode(unsigned int mode)
case CPCAP_BIT_AUDIO_LOW_PWR:
return REGULATOR_MODE_STANDBY;
default:
return -EINVAL;
return REGULATOR_MODE_INVALID;
}
}

13
drivers/regulator/of_regulator.c
View File

@ -31,6 +31,7 @@ static void of_get_regulation_constraints(struct device_node *np,
struct regulation_constraints *constraints = &(*init_data)->constraints;
struct regulator_state *suspend_state;
struct device_node *suspend_np;
unsigned int mode;
int ret, i;
u32 pval;
@ -124,11 +125,11 @@ static void of_get_regulation_constraints(struct device_node *np,
if (!of_property_read_u32(np, "regulator-initial-mode", &pval)) {
if (desc && desc->of_map_mode) {
ret = desc->of_map_mode(pval);
if (ret == -EINVAL)
mode = desc->of_map_mode(pval);
if (mode == REGULATOR_MODE_INVALID)
pr_err("%s: invalid mode %u\n", np->name, pval);
else
constraints->initial_mode = ret;
constraints->initial_mode = mode;
} else {
pr_warn("%s: mapping for mode %d not defined\n",
np->name, pval);
@ -163,12 +164,12 @@ static void of_get_regulation_constraints(struct device_node *np,
if (!of_property_read_u32(suspend_np, "regulator-mode",
&pval)) {
if (desc && desc->of_map_mode) {
ret = desc->of_map_mode(pval);
if (ret == -EINVAL)
mode = desc->of_map_mode(pval);
if (mode == REGULATOR_MODE_INVALID)
pr_err("%s: invalid mode %u\n",
np->name, pval);
else
suspend_state->mode = ret;
suspend_state->mode = mode;
} else {
pr_warn("%s: mapping for mode %d not defined\n",
np->name, pval);

2
drivers/regulator/twl-regulator.c
View File

@ -274,7 +274,7 @@ static inline unsigned int twl4030reg_map_mode(unsigned int mode)
case RES_STATE_SLEEP:
return REGULATOR_MODE_STANDBY;
default:
return -EINVAL;
return REGULATOR_MODE_INVALID;
}
}

1
include/linux/regulator/consumer.h
View File

@ -80,6 +80,7 @@ struct regmap;
* These modes can be OR'ed together to make up a mask of valid register modes.
*/
#define REGULATOR_MODE_INVALID 0x0
#define REGULATOR_MODE_FAST 0x1
#define REGULATOR_MODE_NORMAL 0x2
#define REGULATOR_MODE_IDLE 0x4