2019-01-24 20:29:09

by Paweł Chmiel

Subject: [PATCH v2 1/2] input: misc: pwm-vibra: Prevent unbalanced regulator

From: Jonathan Bakker <[email protected]>

pwm_vibrator_stop disables the regulator, but it can be called from
multiple places, even when the regulator is already disabled. Fix this
by using regulator_is_enabled check when starting and stopping device.

Signed-off-by: Jonathan Bakker <[email protected]>
Signed-off-by: Paweł Chmiel <[email protected]>
---
Changes from v1:
- Rather than using regulator_is_enabled api, use local flag for
checking if regulator is enabled
---
drivers/input/misc/pwm-vibra.c | 17 ++++++++++++-----
1 file changed, 12 insertions(+), 5 deletions(-)

diff --git a/drivers/input/misc/pwm-vibra.c b/drivers/input/misc/pwm-vibra.c
index 55da191ae550..9df87431d7d4 100644
--- a/drivers/input/misc/pwm-vibra.c
+++ b/drivers/input/misc/pwm-vibra.c
@@ -34,6 +34,7 @@ struct pwm_vibrator {
struct work_struct play_work;
u16 level;
u32 direction_duty_cycle;
+ bool vcc_on;
};

static int pwm_vibrator_start(struct pwm_vibrator *vibrator)
@@ -42,10 +43,13 @@ static int pwm_vibrator_start(struct pwm_vibrator *vibrator)
struct pwm_state state;
int err;

- err = regulator_enable(vibrator->vcc);
- if (err) {
- dev_err(pdev, "failed to enable regulator: %d", err);
- return err;
+ if (!vibrator->vcc_on) {
+ err = regulator_enable(vibrator->vcc);
+ if (err) {
+ dev_err(pdev, "failed to enable regulator: %d", err);
+ return err;
+ }
+ vibrator->vcc_on = true;
}

pwm_get_state(vibrator->pwm, &state);
@@ -76,7 +80,10 @@ static int pwm_vibrator_start(struct pwm_vibrator *vibrator)

static void pwm_vibrator_stop(struct pwm_vibrator *vibrator)
{
- regulator_disable(vibrator->vcc);
+ if (vibrator->vcc_on) {
+ regulator_disable(vibrator->vcc);
+ vibrator->vcc_on = false;
+ }

if (vibrator->pwm_dir)
pwm_disable(vibrator->pwm_dir);
--
2.17.1

2019-01-24 20:28:27

by Paweł Chmiel

Subject: [PATCH v2 2/2] input: misc: pwm-vibra: Stop regulator after disabling pwm, not before

This patch fixes order of disable calls in pwm_vibrator_stop.
Currently when starting device, we first enable vcc regulator and then
setup and enable pwm. When stopping, we should do this in oposite order,
so first disable pwm and then disable regulator.
Previously order was the same as in start.

Signed-off-by: Paweł Chmiel <[email protected]>
---
drivers/input/misc/pwm-vibra.c | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/input/misc/pwm-vibra.c b/drivers/input/misc/pwm-vibra.c
index 9df87431d7d4..dbb6d9e1b947 100644
--- a/drivers/input/misc/pwm-vibra.c
+++ b/drivers/input/misc/pwm-vibra.c
@@ -80,14 +80,14 @@ static int pwm_vibrator_start(struct pwm_vibrator *vibrator)

static void pwm_vibrator_stop(struct pwm_vibrator *vibrator)
{
+ if (vibrator->pwm_dir)
+ pwm_disable(vibrator->pwm_dir);
+ pwm_disable(vibrator->pwm);
+
if (vibrator->vcc_on) {
regulator_disable(vibrator->vcc);
vibrator->vcc_on = false;
}
-
- if (vibrator->pwm_dir)
- pwm_disable(vibrator->pwm_dir);
- pwm_disable(vibrator->pwm);
}

static void pwm_vibrator_play_work(struct work_struct *work)
--
2.17.1

2019-02-09 17:13:33

by Dmitry Torokhov

Subject: Re: [PATCH v2 1/2] input: misc: pwm-vibra: Prevent unbalanced regulator

On Thu, Jan 24, 2019 at 09:27:31PM +0100, Paweł Chmiel wrote:
> From: Jonathan Bakker <[email protected]>
>
> pwm_vibrator_stop disables the regulator, but it can be called from
> multiple places, even when the regulator is already disabled. Fix this
> by using regulator_is_enabled check when starting and stopping device.
>
> Signed-off-by: Jonathan Bakker <[email protected]>
> Signed-off-by: Paweł Chmiel <[email protected]>

Applied, thank you.

> ---
> Changes from v1:
> - Rather than using regulator_is_enabled api, use local flag for
> checking if regulator is enabled
> ---
> drivers/input/misc/pwm-vibra.c | 17 ++++++++++++-----
> 1 file changed, 12 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/input/misc/pwm-vibra.c b/drivers/input/misc/pwm-vibra.c
> index 55da191ae550..9df87431d7d4 100644
> --- a/drivers/input/misc/pwm-vibra.c
> +++ b/drivers/input/misc/pwm-vibra.c
> @@ -34,6 +34,7 @@ struct pwm_vibrator {
> struct work_struct play_work;
> u16 level;
> u32 direction_duty_cycle;
> + bool vcc_on;
> };
>
> static int pwm_vibrator_start(struct pwm_vibrator *vibrator)
> @@ -42,10 +43,13 @@ static int pwm_vibrator_start(struct pwm_vibrator *vibrator)
> struct pwm_state state;
> int err;
>
> - err = regulator_enable(vibrator->vcc);
> - if (err) {
> - dev_err(pdev, "failed to enable regulator: %d", err);
> - return err;
> + if (!vibrator->vcc_on) {
> + err = regulator_enable(vibrator->vcc);
> + if (err) {
> + dev_err(pdev, "failed to enable regulator: %d", err);
> + return err;
> + }
> + vibrator->vcc_on = true;
> }
>
> pwm_get_state(vibrator->pwm, &state);
> @@ -76,7 +80,10 @@ static int pwm_vibrator_start(struct pwm_vibrator *vibrator)
>
> static void pwm_vibrator_stop(struct pwm_vibrator *vibrator)
> {
> - regulator_disable(vibrator->vcc);
> + if (vibrator->vcc_on) {
> + regulator_disable(vibrator->vcc);
> + vibrator->vcc_on = false;
> + }
>
> if (vibrator->pwm_dir)
> pwm_disable(vibrator->pwm_dir);
> --
> 2.17.1
>

--
Dmitry

2019-02-09 17:13:48

by Dmitry Torokhov

Subject: Re: [PATCH v2 2/2] input: misc: pwm-vibra: Stop regulator after disabling pwm, not before

On Thu, Jan 24, 2019 at 09:27:32PM +0100, Paweł Chmiel wrote:
> This patch fixes order of disable calls in pwm_vibrator_stop.
> Currently when starting device, we first enable vcc regulator and then
> setup and enable pwm. When stopping, we should do this in oposite order,
> so first disable pwm and then disable regulator.
> Previously order was the same as in start.
>
> Signed-off-by: Paweł Chmiel <[email protected]>

Applied, thank you.

> ---
> drivers/input/misc/pwm-vibra.c | 8 ++++----
> 1 file changed, 4 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/input/misc/pwm-vibra.c b/drivers/input/misc/pwm-vibra.c
> index 9df87431d7d4..dbb6d9e1b947 100644
> --- a/drivers/input/misc/pwm-vibra.c
> +++ b/drivers/input/misc/pwm-vibra.c
> @@ -80,14 +80,14 @@ static int pwm_vibrator_start(struct pwm_vibrator *vibrator)
>
> static void pwm_vibrator_stop(struct pwm_vibrator *vibrator)
> {
> + if (vibrator->pwm_dir)
> + pwm_disable(vibrator->pwm_dir);
> + pwm_disable(vibrator->pwm);
> +
> if (vibrator->vcc_on) {
> regulator_disable(vibrator->vcc);
> vibrator->vcc_on = false;
> }
> -
> - if (vibrator->pwm_dir)
> - pwm_disable(vibrator->pwm_dir);
> - pwm_disable(vibrator->pwm);
> }
>
> static void pwm_vibrator_play_work(struct work_struct *work)
> --
> 2.17.1
>

--
Dmitry