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path: root/drivers/staging/greybus/pwm.c
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Diffstat (limited to 'drivers/staging/greybus/pwm.c')
-rw-r--r--drivers/staging/greybus/pwm.c133
1 files changed, 56 insertions, 77 deletions
diff --git a/drivers/staging/greybus/pwm.c b/drivers/staging/greybus/pwm.c
index a3cb68cfa0f9..01883fbcd79b 100644
--- a/drivers/staging/greybus/pwm.c
+++ b/drivers/staging/greybus/pwm.c
@@ -16,8 +16,6 @@
struct gb_pwm_chip {
struct gb_connection *connection;
- u8 pwm_max; /* max pwm number */
-
struct pwm_chip chip;
};
@@ -26,32 +24,33 @@ static inline struct gb_pwm_chip *pwm_chip_to_gb_pwm_chip(struct pwm_chip *chip)
return container_of(chip, struct gb_pwm_chip, chip);
}
-static int gb_pwm_count_operation(struct gb_pwm_chip *pwmc)
+static int gb_pwm_get_npwm(struct gb_connection *connection)
{
struct gb_pwm_count_response response;
int ret;
- ret = gb_operation_sync(pwmc->connection, GB_PWM_TYPE_PWM_COUNT,
+ ret = gb_operation_sync(connection, GB_PWM_TYPE_PWM_COUNT,
NULL, 0, &response, sizeof(response));
if (ret)
return ret;
- pwmc->pwm_max = response.count;
- return 0;
+
+ /*
+ * The request returns the highest allowed PWM id parameter. So add one
+ * to get the number of PWMs.
+ */
+ return response.count + 1;
}
-static int gb_pwm_activate_operation(struct gb_pwm_chip *pwmc,
- u8 which)
+static int gb_pwm_activate_operation(struct pwm_chip *chip, u8 which)
{
+ struct gb_pwm_chip *pwmc = pwm_chip_to_gb_pwm_chip(chip);
struct gb_pwm_activate_request request;
struct gbphy_device *gbphy_dev;
int ret;
- if (which > pwmc->pwm_max)
- return -EINVAL;
-
request.which = which;
- gbphy_dev = to_gbphy_dev(pwmc->chip.dev);
+ gbphy_dev = to_gbphy_dev(pwmchip_parent(chip));
ret = gbphy_runtime_get_sync(gbphy_dev);
if (ret)
return ret;
@@ -64,19 +63,16 @@ static int gb_pwm_activate_operation(struct gb_pwm_chip *pwmc,
return ret;
}
-static int gb_pwm_deactivate_operation(struct gb_pwm_chip *pwmc,
- u8 which)
+static int gb_pwm_deactivate_operation(struct pwm_chip *chip, u8 which)
{
+ struct gb_pwm_chip *pwmc = pwm_chip_to_gb_pwm_chip(chip);
struct gb_pwm_deactivate_request request;
struct gbphy_device *gbphy_dev;
int ret;
- if (which > pwmc->pwm_max)
- return -EINVAL;
-
request.which = which;
- gbphy_dev = to_gbphy_dev(pwmc->chip.dev);
+ gbphy_dev = to_gbphy_dev(pwmchip_parent(chip));
ret = gbphy_runtime_get_sync(gbphy_dev);
if (ret)
return ret;
@@ -89,21 +85,19 @@ static int gb_pwm_deactivate_operation(struct gb_pwm_chip *pwmc,
return ret;
}
-static int gb_pwm_config_operation(struct gb_pwm_chip *pwmc,
+static int gb_pwm_config_operation(struct pwm_chip *chip,
u8 which, u32 duty, u32 period)
{
+ struct gb_pwm_chip *pwmc = pwm_chip_to_gb_pwm_chip(chip);
struct gb_pwm_config_request request;
struct gbphy_device *gbphy_dev;
int ret;
- if (which > pwmc->pwm_max)
- return -EINVAL;
-
request.which = which;
request.duty = cpu_to_le32(duty);
request.period = cpu_to_le32(period);
- gbphy_dev = to_gbphy_dev(pwmc->chip.dev);
+ gbphy_dev = to_gbphy_dev(pwmchip_parent(chip));
ret = gbphy_runtime_get_sync(gbphy_dev);
if (ret)
return ret;
@@ -116,20 +110,18 @@ static int gb_pwm_config_operation(struct gb_pwm_chip *pwmc,
return ret;
}
-static int gb_pwm_set_polarity_operation(struct gb_pwm_chip *pwmc,
+static int gb_pwm_set_polarity_operation(struct pwm_chip *chip,
u8 which, u8 polarity)
{
+ struct gb_pwm_chip *pwmc = pwm_chip_to_gb_pwm_chip(chip);
struct gb_pwm_polarity_request request;
struct gbphy_device *gbphy_dev;
int ret;
- if (which > pwmc->pwm_max)
- return -EINVAL;
-
request.which = which;
request.polarity = polarity;
- gbphy_dev = to_gbphy_dev(pwmc->chip.dev);
+ gbphy_dev = to_gbphy_dev(pwmchip_parent(chip));
ret = gbphy_runtime_get_sync(gbphy_dev);
if (ret)
return ret;
@@ -142,19 +134,16 @@ static int gb_pwm_set_polarity_operation(struct gb_pwm_chip *pwmc,
return ret;
}
-static int gb_pwm_enable_operation(struct gb_pwm_chip *pwmc,
- u8 which)
+static int gb_pwm_enable_operation(struct pwm_chip *chip, u8 which)
{
+ struct gb_pwm_chip *pwmc = pwm_chip_to_gb_pwm_chip(chip);
struct gb_pwm_enable_request request;
struct gbphy_device *gbphy_dev;
int ret;
- if (which > pwmc->pwm_max)
- return -EINVAL;
-
request.which = which;
- gbphy_dev = to_gbphy_dev(pwmc->chip.dev);
+ gbphy_dev = to_gbphy_dev(pwmchip_parent(chip));
ret = gbphy_runtime_get_sync(gbphy_dev);
if (ret)
return ret;
@@ -167,22 +156,19 @@ static int gb_pwm_enable_operation(struct gb_pwm_chip *pwmc,
return ret;
}
-static int gb_pwm_disable_operation(struct gb_pwm_chip *pwmc,
- u8 which)
+static int gb_pwm_disable_operation(struct pwm_chip *chip, u8 which)
{
+ struct gb_pwm_chip *pwmc = pwm_chip_to_gb_pwm_chip(chip);
struct gb_pwm_disable_request request;
struct gbphy_device *gbphy_dev;
int ret;
- if (which > pwmc->pwm_max)
- return -EINVAL;
-
request.which = which;
ret = gb_operation_sync(pwmc->connection, GB_PWM_TYPE_DISABLE,
&request, sizeof(request), NULL, 0);
- gbphy_dev = to_gbphy_dev(pwmc->chip.dev);
+ gbphy_dev = to_gbphy_dev(pwmchip_parent(chip));
gbphy_runtime_put_autosuspend(gbphy_dev);
return ret;
@@ -190,19 +176,15 @@ static int gb_pwm_disable_operation(struct gb_pwm_chip *pwmc,
static int gb_pwm_request(struct pwm_chip *chip, struct pwm_device *pwm)
{
- struct gb_pwm_chip *pwmc = pwm_chip_to_gb_pwm_chip(chip);
-
- return gb_pwm_activate_operation(pwmc, pwm->hwpwm);
+ return gb_pwm_activate_operation(chip, pwm->hwpwm);
};
static void gb_pwm_free(struct pwm_chip *chip, struct pwm_device *pwm)
{
- struct gb_pwm_chip *pwmc = pwm_chip_to_gb_pwm_chip(chip);
-
if (pwm_is_enabled(pwm))
- dev_warn(chip->dev, "freeing PWM device without disabling\n");
+ dev_warn(pwmchip_parent(chip), "freeing PWM device without disabling\n");
- gb_pwm_deactivate_operation(pwmc, pwm->hwpwm);
+ gb_pwm_deactivate_operation(chip, pwm->hwpwm);
}
static int gb_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm,
@@ -212,22 +194,21 @@ static int gb_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm,
bool enabled = pwm->state.enabled;
u64 period = state->period;
u64 duty_cycle = state->duty_cycle;
- struct gb_pwm_chip *pwmc = pwm_chip_to_gb_pwm_chip(chip);
/* Set polarity */
if (state->polarity != pwm->state.polarity) {
if (enabled) {
- gb_pwm_disable_operation(pwmc, pwm->hwpwm);
+ gb_pwm_disable_operation(chip, pwm->hwpwm);
enabled = false;
}
- err = gb_pwm_set_polarity_operation(pwmc, pwm->hwpwm, state->polarity);
+ err = gb_pwm_set_polarity_operation(chip, pwm->hwpwm, state->polarity);
if (err)
return err;
}
if (!state->enabled) {
if (enabled)
- gb_pwm_disable_operation(pwmc, pwm->hwpwm);
+ gb_pwm_disable_operation(chip, pwm->hwpwm);
return 0;
}
@@ -243,13 +224,13 @@ static int gb_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm,
if (duty_cycle > period)
duty_cycle = period;
- err = gb_pwm_config_operation(pwmc, pwm->hwpwm, duty_cycle, period);
+ err = gb_pwm_config_operation(chip, pwm->hwpwm, duty_cycle, period);
if (err)
return err;
/* enable/disable */
if (!enabled)
- return gb_pwm_enable_operation(pwmc, pwm->hwpwm);
+ return gb_pwm_enable_operation(chip, pwm->hwpwm);
return 0;
}
@@ -266,61 +247,59 @@ static int gb_pwm_probe(struct gbphy_device *gbphy_dev,
struct gb_connection *connection;
struct gb_pwm_chip *pwmc;
struct pwm_chip *chip;
- int ret;
-
- pwmc = kzalloc(sizeof(*pwmc), GFP_KERNEL);
- if (!pwmc)
- return -ENOMEM;
+ int ret, npwm;
connection = gb_connection_create(gbphy_dev->bundle,
le16_to_cpu(gbphy_dev->cport_desc->id),
NULL);
- if (IS_ERR(connection)) {
- ret = PTR_ERR(connection);
- goto exit_pwmc_free;
- }
-
- pwmc->connection = connection;
- gb_connection_set_data(connection, pwmc);
- gb_gbphy_set_data(gbphy_dev, pwmc);
+ if (IS_ERR(connection))
+ return PTR_ERR(connection);
ret = gb_connection_enable(connection);
if (ret)
goto exit_connection_destroy;
/* Query number of pwms present */
- ret = gb_pwm_count_operation(pwmc);
- if (ret)
+ ret = gb_pwm_get_npwm(connection);
+ if (ret < 0)
+ goto exit_connection_disable;
+ npwm = ret;
+
+ chip = pwmchip_alloc(&gbphy_dev->dev, npwm, sizeof(*pwmc));
+ if (IS_ERR(chip)) {
+ ret = PTR_ERR(chip);
goto exit_connection_disable;
+ }
+ gb_gbphy_set_data(gbphy_dev, chip);
- chip = &pwmc->chip;
+ pwmc = pwm_chip_to_gb_pwm_chip(chip);
+ pwmc->connection = connection;
- chip->dev = &gbphy_dev->dev;
chip->ops = &gb_pwm_ops;
- chip->npwm = pwmc->pwm_max + 1;
ret = pwmchip_add(chip);
if (ret) {
dev_err(&gbphy_dev->dev,
"failed to register PWM: %d\n", ret);
- goto exit_connection_disable;
+ goto exit_pwmchip_put;
}
gbphy_runtime_put_autosuspend(gbphy_dev);
return 0;
+exit_pwmchip_put:
+ pwmchip_put(chip);
exit_connection_disable:
gb_connection_disable(connection);
exit_connection_destroy:
gb_connection_destroy(connection);
-exit_pwmc_free:
- kfree(pwmc);
return ret;
}
static void gb_pwm_remove(struct gbphy_device *gbphy_dev)
{
- struct gb_pwm_chip *pwmc = gb_gbphy_get_data(gbphy_dev);
+ struct pwm_chip *chip = gb_gbphy_get_data(gbphy_dev);
+ struct gb_pwm_chip *pwmc = pwm_chip_to_gb_pwm_chip(chip);
struct gb_connection *connection = pwmc->connection;
int ret;
@@ -328,10 +307,10 @@ static void gb_pwm_remove(struct gbphy_device *gbphy_dev)
if (ret)
gbphy_runtime_get_noresume(gbphy_dev);
- pwmchip_remove(&pwmc->chip);
+ pwmchip_remove(chip);
+ pwmchip_put(chip);
gb_connection_disable(connection);
gb_connection_destroy(connection);
- kfree(pwmc);
}
static const struct gbphy_device_id gb_pwm_id_table[] = {
generated by cgit v1.2.3 (git 2.39.0) at 2024-07-10 06:27:42 +0300