[PATCH v5 17/46] pwm: add the PWM initial state retrieval infra
From: Boris Brezillon <hidden>
Date: 2016-03-30 20:05:05
Also in:
dri-devel, intel-gfx, linux-clk, linux-fbdev, linux-input, linux-leds, linux-pwm, linux-rockchip, linux-samsung-soc, lkml
Subsystem:
pwm subsystem, the rest · Maintainers:
Uwe Kleine-König, Linus Torvalds
Add a ->get_state() function to the pwm_ops struct to let PWM drivers initialize the PWM state attached to a PWM device. Signed-off-by: Boris Brezillon <redacted> --- drivers/pwm/core.c | 3 +++ include/linux/pwm.h | 5 +++++ 2 files changed, 8 insertions(+)
diff --git a/drivers/pwm/core.c b/drivers/pwm/core.c
index c240b54..a909c64 100644
--- a/drivers/pwm/core.c
+++ b/drivers/pwm/core.c@@ -270,6 +270,9 @@ int pwmchip_add_with_polarity(struct pwm_chip *chip, pwm->hwpwm = i; pwm->state.polarity = polarity; + if (chip->ops->get_state) + chip->ops->get_state(chip, pwm, &pwm->state); + radix_tree_insert(&pwm_tree, pwm->pwm, pwm); }
diff --git a/include/linux/pwm.h b/include/linux/pwm.h
index 55bf463..ceedcf8 100644
--- a/include/linux/pwm.h
+++ b/include/linux/pwm.h@@ -211,6 +211,9 @@ static inline void pwm_get_args(const struct pwm_device *pwm, * @set_polarity: configure the polarity of this PWM * @enable: enable PWM output toggling * @disable: disable PWM output toggling + * @get_state: get the current PWM state. This function is only + * called once per PWM device when the PWM chip is + * registered. * @dbg_show: optional routine to show contents in debugfs * @owner: helps prevent removal of modules exporting active PWMs */
@@ -223,6 +226,8 @@ struct pwm_ops { enum pwm_polarity polarity); int (*enable)(struct pwm_chip *chip, struct pwm_device *pwm); void (*disable)(struct pwm_chip *chip, struct pwm_device *pwm); + void (*get_state)(struct pwm_chip *chip, struct pwm_device *pwm, + struct pwm_state *pstate); #ifdef CONFIG_DEBUG_FS void (*dbg_show)(struct pwm_chip *chip, struct seq_file *s); #endif
--
2.5.0