diff options
Diffstat (limited to 'include/linux/pwm.h')
| -rw-r--r-- | include/linux/pwm.h | 694 |
1 files changed, 523 insertions, 171 deletions
diff --git a/include/linux/pwm.h b/include/linux/pwm.h index f0feafd184a0..b11ae91723f8 100644 --- a/include/linux/pwm.h +++ b/include/linux/pwm.h @@ -1,215 +1,577 @@ +/* SPDX-License-Identifier: GPL-2.0 */ #ifndef __LINUX_PWM_H #define __LINUX_PWM_H +#include <linux/cdev.h> +#include <linux/device.h> #include <linux/err.h> +#include <linux/gpio/driver.h> +#include <linux/module.h> +#include <linux/mutex.h> #include <linux/of.h> -struct pwm_device; -struct seq_file; +MODULE_IMPORT_NS("PWM"); -#if IS_ENABLED(CONFIG_PWM) || IS_ENABLED(CONFIG_HAVE_PWM) -/* - * pwm_request - request a PWM device +struct pwm_chip; + +/** + * enum pwm_polarity - polarity of a PWM signal + * @PWM_POLARITY_NORMAL: a high signal for the duration of the duty- + * cycle, followed by a low signal for the remainder of the pulse + * period + * @PWM_POLARITY_INVERSED: a low signal for the duration of the duty- + * cycle, followed by a high signal for the remainder of the pulse + * period */ -struct pwm_device *pwm_request(int pwm_id, const char *label); +enum pwm_polarity { + PWM_POLARITY_NORMAL, + PWM_POLARITY_INVERSED, +}; -/* - * pwm_free - free a PWM device +/** + * struct pwm_args - board-dependent PWM arguments + * @period: reference period + * @polarity: reference polarity + * + * This structure describes board-dependent arguments attached to a PWM + * device. These arguments are usually retrieved from the PWM lookup table or + * device tree. + * + * Do not confuse this with the PWM state: PWM arguments represent the initial + * configuration that users want to use on this PWM device rather than the + * current PWM hardware state. */ -void pwm_free(struct pwm_device *pwm); +struct pwm_args { + u64 period; + enum pwm_polarity polarity; +}; -/* - * pwm_config - change a PWM device configuration +enum { + PWMF_REQUESTED = 0, + PWMF_EXPORTED = 1, +}; + +/** + * struct pwm_waveform - description of a PWM waveform + * @period_length_ns: PWM period + * @duty_length_ns: PWM duty cycle + * @duty_offset_ns: offset of the rising edge from the period's start + * + * This is a representation of a PWM waveform alternative to struct pwm_state + * below. It's more expressive than struct pwm_state as it contains a + * duty_offset_ns and so can represent offsets other than zero (with .polarity = + * PWM_POLARITY_NORMAL) and period - duty_cycle (.polarity = + * PWM_POLARITY_INVERSED). + * + * Note there is no explicit bool for enabled. A "disabled" PWM is represented + * by .period_length_ns = 0. Note further that the behaviour of a "disabled" PWM + * is undefined. Depending on the hardware's capabilities it might drive the + * active or inactive level, go high-z or even continue to toggle. + * + * The unit for all three members is nanoseconds. */ -int pwm_config(struct pwm_device *pwm, int duty_ns, int period_ns); +struct pwm_waveform { + u64 period_length_ns; + u64 duty_length_ns; + u64 duty_offset_ns; +}; /* - * pwm_enable - start a PWM output toggling + * struct pwm_state - state of a PWM channel + * @period: PWM period (in nanoseconds) + * @duty_cycle: PWM duty cycle (in nanoseconds) + * @polarity: PWM polarity + * @enabled: PWM enabled status + * @usage_power: If set, the PWM driver is only required to maintain the power + * output but has more freedom regarding signal form. + * If supported, the signal can be optimized, for example to + * improve EMI by phase shifting individual channels. */ -int pwm_enable(struct pwm_device *pwm); +struct pwm_state { + u64 period; + u64 duty_cycle; + enum pwm_polarity polarity; + bool enabled; + bool usage_power; +}; -/* - * pwm_disable - stop a PWM output toggling +/** + * struct pwm_device - PWM channel object + * @label: name of the PWM device + * @flags: flags associated with the PWM device + * @hwpwm: per-chip relative index of the PWM device + * @chip: PWM chip providing this PWM device + * @args: PWM arguments + * @state: last applied state + * @last: last implemented state (for PWM_DEBUG) */ -void pwm_disable(struct pwm_device *pwm); -#else -static inline struct pwm_device *pwm_request(int pwm_id, const char *label) +struct pwm_device { + const char *label; + unsigned long flags; + unsigned int hwpwm; + struct pwm_chip *chip; + + struct pwm_args args; + struct pwm_state state; + struct pwm_state last; +}; + +/** + * pwm_get_state() - retrieve the current PWM state + * @pwm: PWM device + * @state: state to fill with the current PWM state + * + * The returned PWM state represents the state that was applied by a previous call to + * pwm_apply_might_sleep(). Drivers may have to slightly tweak that state before programming it to + * hardware. If pwm_apply_might_sleep() was never called, this returns either the current hardware + * state (if supported) or the default settings. + */ +static inline void pwm_get_state(const struct pwm_device *pwm, + struct pwm_state *state) { - return ERR_PTR(-ENODEV); + *state = pwm->state; } -static inline void pwm_free(struct pwm_device *pwm) +static inline bool pwm_is_enabled(const struct pwm_device *pwm) { + struct pwm_state state; + + pwm_get_state(pwm, &state); + + return state.enabled; } -static inline int pwm_config(struct pwm_device *pwm, int duty_ns, int period_ns) +static inline u64 pwm_get_period(const struct pwm_device *pwm) { - return -EINVAL; + struct pwm_state state; + + pwm_get_state(pwm, &state); + + return state.period; } -static inline int pwm_enable(struct pwm_device *pwm) +static inline u64 pwm_get_duty_cycle(const struct pwm_device *pwm) { - return -EINVAL; + struct pwm_state state; + + pwm_get_state(pwm, &state); + + return state.duty_cycle; } -static inline void pwm_disable(struct pwm_device *pwm) +static inline enum pwm_polarity pwm_get_polarity(const struct pwm_device *pwm) { + struct pwm_state state; + + pwm_get_state(pwm, &state); + + return state.polarity; } -#endif -struct pwm_chip; +static inline void pwm_get_args(const struct pwm_device *pwm, + struct pwm_args *args) +{ + *args = pwm->args; +} /** - * enum pwm_polarity - polarity of a PWM signal - * @PWM_POLARITY_NORMAL: a high signal for the duration of the duty- - * cycle, followed by a low signal for the remainder of the pulse - * period - * @PWM_POLARITY_INVERSED: a low signal for the duration of the duty- - * cycle, followed by a high signal for the remainder of the pulse - * period + * pwm_init_state() - prepare a new state to be applied with pwm_apply_might_sleep() + * @pwm: PWM device + * @state: state to fill with the prepared PWM state + * + * This functions prepares a state that can later be tweaked and applied + * to the PWM device with pwm_apply_might_sleep(). This is a convenient function + * that first retrieves the current PWM state and the replaces the period + * and polarity fields with the reference values defined in pwm->args. + * Once the function returns, you can adjust the ->enabled and ->duty_cycle + * fields according to your needs before calling pwm_apply_might_sleep(). + * + * ->duty_cycle is initially set to zero to avoid cases where the current + * ->duty_cycle value exceed the pwm_args->period one, which would trigger + * an error if the user calls pwm_apply_might_sleep() without adjusting ->duty_cycle + * first. */ -enum pwm_polarity { - PWM_POLARITY_NORMAL, - PWM_POLARITY_INVERSED, -}; +static inline void pwm_init_state(const struct pwm_device *pwm, + struct pwm_state *state) +{ + struct pwm_args args; -enum { - PWMF_REQUESTED = 1 << 0, - PWMF_ENABLED = 1 << 1, - PWMF_EXPORTED = 1 << 2, -}; + /* First get the current state. */ + pwm_get_state(pwm, state); -struct pwm_device { - const char *label; - unsigned long flags; - unsigned int hwpwm; - unsigned int pwm; - struct pwm_chip *chip; - void *chip_data; - - unsigned int period; /* in nanoseconds */ - unsigned int duty_cycle; /* in nanoseconds */ - enum pwm_polarity polarity; -}; + /* Then fill it with the reference config */ + pwm_get_args(pwm, &args); -static inline void pwm_set_period(struct pwm_device *pwm, unsigned int period) -{ - if (pwm) - pwm->period = period; + state->period = args.period; + state->polarity = args.polarity; + state->duty_cycle = 0; + state->usage_power = false; } -static inline unsigned int pwm_get_period(struct pwm_device *pwm) +/** + * pwm_get_relative_duty_cycle() - Get a relative duty cycle value + * @state: PWM state to extract the duty cycle from + * @scale: target scale of the relative duty cycle + * + * This functions converts the absolute duty cycle stored in @state (expressed + * in nanosecond) into a value relative to the period. + * + * For example if you want to get the duty_cycle expressed in percent, call: + * + * pwm_get_state(pwm, &state); + * duty = pwm_get_relative_duty_cycle(&state, 100); + * + * Returns: rounded relative duty cycle multiplied by @scale + */ +static inline unsigned int +pwm_get_relative_duty_cycle(const struct pwm_state *state, unsigned int scale) { - return pwm ? pwm->period : 0; -} + if (!state->period) + return 0; -static inline void pwm_set_duty_cycle(struct pwm_device *pwm, unsigned int duty) -{ - if (pwm) - pwm->duty_cycle = duty; + return DIV_ROUND_CLOSEST_ULL((u64)state->duty_cycle * scale, + state->period); } -static inline unsigned int pwm_get_duty_cycle(struct pwm_device *pwm) +/** + * pwm_set_relative_duty_cycle() - Set a relative duty cycle value + * @state: PWM state to fill + * @duty_cycle: relative duty cycle value + * @scale: scale in which @duty_cycle is expressed + * + * This functions converts a relative into an absolute duty cycle (expressed + * in nanoseconds), and puts the result in state->duty_cycle. + * + * For example if you want to configure a 50% duty cycle, call: + * + * pwm_init_state(pwm, &state); + * pwm_set_relative_duty_cycle(&state, 50, 100); + * pwm_apply_might_sleep(pwm, &state); + * + * Returns: 0 on success or ``-EINVAL`` if @duty_cycle and/or @scale are + * inconsistent (@scale == 0 or @duty_cycle > @scale) + */ +static inline int +pwm_set_relative_duty_cycle(struct pwm_state *state, unsigned int duty_cycle, + unsigned int scale) { - return pwm ? pwm->duty_cycle : 0; + if (!scale || duty_cycle > scale) + return -EINVAL; + + state->duty_cycle = DIV_ROUND_CLOSEST_ULL((u64)duty_cycle * + state->period, + scale); + + return 0; } -/* - * pwm_set_polarity - configure the polarity of a PWM signal +/** + * struct pwm_capture - PWM capture data + * @period: period of the PWM signal (in nanoseconds) + * @duty_cycle: duty cycle of the PWM signal (in nanoseconds) */ -int pwm_set_polarity(struct pwm_device *pwm, enum pwm_polarity polarity); +struct pwm_capture { + unsigned int period; + unsigned int duty_cycle; +}; + +#define PWM_WFHWSIZE 20 /** * struct pwm_ops - PWM controller operations * @request: optional hook for requesting a PWM * @free: optional hook for freeing a PWM - * @config: configure duty cycles and period length for this PWM - * @set_polarity: configure the polarity of this PWM - * @enable: enable PWM output toggling - * @disable: disable PWM output toggling - * @dbg_show: optional routine to show contents in debugfs - * @owner: helps prevent removal of modules exporting active PWMs + * @capture: capture and report PWM signal + * @sizeof_wfhw: size (in bytes) of driver specific waveform presentation + * @round_waveform_tohw: convert a struct pwm_waveform to driver specific presentation + * @round_waveform_fromhw: convert a driver specific waveform presentation to struct pwm_waveform + * @read_waveform: read driver specific waveform presentation from hardware + * @write_waveform: write driver specific waveform presentation to hardware + * @apply: atomically apply a new PWM config + * @get_state: get the current PWM state. */ struct pwm_ops { - int (*request)(struct pwm_chip *chip, - struct pwm_device *pwm); - void (*free)(struct pwm_chip *chip, - struct pwm_device *pwm); - int (*config)(struct pwm_chip *chip, - struct pwm_device *pwm, - int duty_ns, int period_ns); - int (*set_polarity)(struct pwm_chip *chip, - struct pwm_device *pwm, - enum pwm_polarity polarity); - int (*enable)(struct pwm_chip *chip, - struct pwm_device *pwm); - void (*disable)(struct pwm_chip *chip, - struct pwm_device *pwm); -#ifdef CONFIG_DEBUG_FS - void (*dbg_show)(struct pwm_chip *chip, - struct seq_file *s); -#endif - struct module *owner; + int (*request)(struct pwm_chip *chip, struct pwm_device *pwm); + void (*free)(struct pwm_chip *chip, struct pwm_device *pwm); + int (*capture)(struct pwm_chip *chip, struct pwm_device *pwm, + struct pwm_capture *result, unsigned long timeout); + + size_t sizeof_wfhw; + int (*round_waveform_tohw)(struct pwm_chip *chip, struct pwm_device *pwm, + const struct pwm_waveform *wf, void *wfhw); + int (*round_waveform_fromhw)(struct pwm_chip *chip, struct pwm_device *pwm, + const void *wfhw, struct pwm_waveform *wf); + int (*read_waveform)(struct pwm_chip *chip, struct pwm_device *pwm, + void *wfhw); + int (*write_waveform)(struct pwm_chip *chip, struct pwm_device *pwm, + const void *wfhw); + + int (*apply)(struct pwm_chip *chip, struct pwm_device *pwm, + const struct pwm_state *state); + int (*get_state)(struct pwm_chip *chip, struct pwm_device *pwm, + struct pwm_state *state); }; /** * struct pwm_chip - abstract a PWM controller * @dev: device providing the PWMs - * @list: list node for internal use + * @cdev: &struct cdev for this device * @ops: callbacks for this PWM controller - * @base: number of first PWM controlled by this chip + * @owner: module providing this chip + * @id: unique number of this PWM chip * @npwm: number of PWMs controlled by this chip + * @of_xlate: request a PWM device given a device tree PWM specifier + * @atomic: can the driver's ->apply() be called in atomic context + * @gpio: &struct gpio_chip to operate this PWM chip's lines as GPO + * @uses_pwmchip_alloc: signals if pwmchip_allow was used to allocate this chip + * @operational: signals if the chip can be used (or is already deregistered) + * @nonatomic_lock: mutex for nonatomic chips + * @atomic_lock: mutex for atomic chips * @pwms: array of PWM devices allocated by the framework - * @can_sleep: must be true if the .config(), .enable() or .disable() - * operations may sleep */ struct pwm_chip { - struct device *dev; - struct list_head list; - const struct pwm_ops *ops; - int base; - unsigned int npwm; - - struct pwm_device *pwms; - - struct pwm_device * (*of_xlate)(struct pwm_chip *pc, - const struct of_phandle_args *args); - unsigned int of_pwm_n_cells; - bool can_sleep; + struct device dev; + struct cdev cdev; + const struct pwm_ops *ops; + struct module *owner; + unsigned int id; + unsigned int npwm; + + struct pwm_device * (*of_xlate)(struct pwm_chip *chip, + const struct of_phandle_args *args); + bool atomic; + + /* only used internally by the PWM framework */ + struct gpio_chip gpio; + bool uses_pwmchip_alloc; + bool operational; + union { + /* + * depending on the chip being atomic or not either the mutex or + * the spinlock is used. It protects .operational and + * synchronizes the callbacks in .ops + */ + struct mutex nonatomic_lock; + spinlock_t atomic_lock; + }; + struct pwm_device pwms[] __counted_by(npwm); }; -#if IS_ENABLED(CONFIG_PWM) -int pwm_set_chip_data(struct pwm_device *pwm, void *data); -void *pwm_get_chip_data(struct pwm_device *pwm); +/** + * pwmchip_supports_waveform() - checks if the given chip supports waveform callbacks + * @chip: The pwm_chip to test + * + * Returns: true iff the pwm chip support the waveform functions like + * pwm_set_waveform_might_sleep() and pwm_round_waveform_might_sleep() + */ +static inline bool pwmchip_supports_waveform(struct pwm_chip *chip) +{ + /* + * only check for .write_waveform(). If that is available, + * .round_waveform_tohw() and .round_waveform_fromhw() asserted to be + * available, too, in pwmchip_add(). + */ + return chip->ops->write_waveform != NULL; +} + +static inline struct device *pwmchip_parent(const struct pwm_chip *chip) +{ + return chip->dev.parent; +} + +static inline void *pwmchip_get_drvdata(const struct pwm_chip *chip) +{ + return dev_get_drvdata(&chip->dev); +} + +static inline void pwmchip_set_drvdata(struct pwm_chip *chip, void *data) +{ + dev_set_drvdata(&chip->dev, data); +} + +#if IS_REACHABLE(CONFIG_PWM) + +/* PWM consumer APIs */ +int pwm_round_waveform_might_sleep(struct pwm_device *pwm, struct pwm_waveform *wf); +int pwm_get_waveform_might_sleep(struct pwm_device *pwm, struct pwm_waveform *wf); +int pwm_set_waveform_might_sleep(struct pwm_device *pwm, const struct pwm_waveform *wf, bool exact); +int pwm_apply_might_sleep(struct pwm_device *pwm, const struct pwm_state *state); +int pwm_apply_atomic(struct pwm_device *pwm, const struct pwm_state *state); +int pwm_get_state_hw(struct pwm_device *pwm, struct pwm_state *state); +int pwm_adjust_config(struct pwm_device *pwm); + +/** + * pwm_config() - change a PWM device configuration + * @pwm: PWM device + * @duty_ns: "on" time (in nanoseconds) + * @period_ns: duration (in nanoseconds) of one cycle + * + * Returns: 0 on success or a negative error code on failure. + */ +static inline int pwm_config(struct pwm_device *pwm, int duty_ns, + int period_ns) +{ + struct pwm_state state; + + if (!pwm) + return -EINVAL; + + if (duty_ns < 0 || period_ns < 0) + return -EINVAL; + + pwm_get_state(pwm, &state); + if (state.duty_cycle == duty_ns && state.period == period_ns) + return 0; + + state.duty_cycle = duty_ns; + state.period = period_ns; + return pwm_apply_might_sleep(pwm, &state); +} + +/** + * pwm_enable() - start a PWM output toggling + * @pwm: PWM device + * + * Returns: 0 on success or a negative error code on failure. + */ +static inline int pwm_enable(struct pwm_device *pwm) +{ + struct pwm_state state; + + if (!pwm) + return -EINVAL; + + pwm_get_state(pwm, &state); + if (state.enabled) + return 0; + + state.enabled = true; + return pwm_apply_might_sleep(pwm, &state); +} + +/** + * pwm_disable() - stop a PWM output toggling + * @pwm: PWM device + */ +static inline void pwm_disable(struct pwm_device *pwm) +{ + struct pwm_state state; + + if (!pwm) + return; + + pwm_get_state(pwm, &state); + if (!state.enabled) + return; -int pwmchip_add(struct pwm_chip *chip); -int pwmchip_remove(struct pwm_chip *chip); -struct pwm_device *pwm_request_from_chip(struct pwm_chip *chip, - unsigned int index, - const char *label); + state.enabled = false; + pwm_apply_might_sleep(pwm, &state); +} + +/** + * pwm_might_sleep() - is pwm_apply_atomic() supported? + * @pwm: PWM device + * + * Returns: false if pwm_apply_atomic() can be called from atomic context. + */ +static inline bool pwm_might_sleep(struct pwm_device *pwm) +{ + return !pwm->chip->atomic; +} -struct pwm_device *of_pwm_xlate_with_flags(struct pwm_chip *pc, +/* PWM provider APIs */ +void pwmchip_put(struct pwm_chip *chip); +struct pwm_chip *pwmchip_alloc(struct device *parent, unsigned int npwm, size_t sizeof_priv); +struct pwm_chip *devm_pwmchip_alloc(struct device *parent, unsigned int npwm, size_t sizeof_priv); + +int __pwmchip_add(struct pwm_chip *chip, struct module *owner); +#define pwmchip_add(chip) __pwmchip_add(chip, THIS_MODULE) +void pwmchip_remove(struct pwm_chip *chip); + +/* + * For FFI wrapper use only: + * The Rust PWM abstraction needs this to properly free the pwm_chip. + */ +void pwmchip_release(struct device *dev); + +int __devm_pwmchip_add(struct device *dev, struct pwm_chip *chip, struct module *owner); +#define devm_pwmchip_add(dev, chip) __devm_pwmchip_add(dev, chip, THIS_MODULE) + +struct pwm_device *of_pwm_xlate_with_flags(struct pwm_chip *chip, const struct of_phandle_args *args); +struct pwm_device *of_pwm_single_xlate(struct pwm_chip *chip, + const struct of_phandle_args *args); struct pwm_device *pwm_get(struct device *dev, const char *con_id); -struct pwm_device *of_pwm_get(struct device_node *np, const char *con_id); void pwm_put(struct pwm_device *pwm); struct pwm_device *devm_pwm_get(struct device *dev, const char *con_id); -struct pwm_device *devm_of_pwm_get(struct device *dev, struct device_node *np, - const char *con_id); -void devm_pwm_put(struct device *dev, struct pwm_device *pwm); - -bool pwm_can_sleep(struct pwm_device *pwm); +struct pwm_device *devm_fwnode_pwm_get(struct device *dev, + struct fwnode_handle *fwnode, + const char *con_id); #else -static inline int pwm_set_chip_data(struct pwm_device *pwm, void *data) +static inline bool pwm_might_sleep(struct pwm_device *pwm) { + return true; +} + +static inline int pwm_apply_might_sleep(struct pwm_device *pwm, + const struct pwm_state *state) +{ + might_sleep(); + return -EOPNOTSUPP; +} + +static inline int pwm_apply_atomic(struct pwm_device *pwm, + const struct pwm_state *state) +{ + return -EOPNOTSUPP; +} + +static inline int pwm_get_state_hw(struct pwm_device *pwm, struct pwm_state *state) +{ + return -EOPNOTSUPP; +} + +static inline int pwm_adjust_config(struct pwm_device *pwm) +{ + return -EOPNOTSUPP; +} + +static inline int pwm_config(struct pwm_device *pwm, int duty_ns, + int period_ns) +{ + might_sleep(); return -EINVAL; } -static inline void *pwm_get_chip_data(struct pwm_device *pwm) +static inline int pwm_enable(struct pwm_device *pwm) +{ + might_sleep(); + return -EINVAL; +} + +static inline void pwm_disable(struct pwm_device *pwm) +{ + might_sleep(); +} + +static inline void pwmchip_put(struct pwm_chip *chip) +{ +} + +static inline struct pwm_chip *pwmchip_alloc(struct device *parent, + unsigned int npwm, + size_t sizeof_priv) { - return NULL; + return ERR_PTR(-EINVAL); +} + +static inline struct pwm_chip *devm_pwmchip_alloc(struct device *parent, + unsigned int npwm, + size_t sizeof_priv) +{ + return pwmchip_alloc(parent, npwm, sizeof_priv); } static inline int pwmchip_add(struct pwm_chip *chip) @@ -222,50 +584,37 @@ static inline int pwmchip_remove(struct pwm_chip *chip) return -EINVAL; } -static inline struct pwm_device *pwm_request_from_chip(struct pwm_chip *chip, - unsigned int index, - const char *label) +static inline int devm_pwmchip_add(struct device *dev, struct pwm_chip *chip) { - return ERR_PTR(-ENODEV); + return -EINVAL; } static inline struct pwm_device *pwm_get(struct device *dev, const char *consumer) { - return ERR_PTR(-ENODEV); -} - -static inline struct pwm_device *of_pwm_get(struct device_node *np, - const char *con_id) -{ + might_sleep(); return ERR_PTR(-ENODEV); } static inline void pwm_put(struct pwm_device *pwm) { + might_sleep(); } static inline struct pwm_device *devm_pwm_get(struct device *dev, const char *consumer) { + might_sleep(); return ERR_PTR(-ENODEV); } -static inline struct pwm_device *devm_of_pwm_get(struct device *dev, - struct device_node *np, - const char *con_id) +static inline struct pwm_device * +devm_fwnode_pwm_get(struct device *dev, struct fwnode_handle *fwnode, + const char *con_id) { + might_sleep(); return ERR_PTR(-ENODEV); } - -static inline void devm_pwm_put(struct device *dev, struct pwm_device *pwm) -{ -} - -static inline bool pwm_can_sleep(struct pwm_device *pwm) -{ - return false; -} #endif struct pwm_lookup { @@ -274,35 +623,38 @@ struct pwm_lookup { unsigned int index; const char *dev_id; const char *con_id; + unsigned int period; + enum pwm_polarity polarity; + const char *module; /* optional, may be NULL */ }; -#define PWM_LOOKUP(_provider, _index, _dev_id, _con_id) \ - { \ - .provider = _provider, \ - .index = _index, \ - .dev_id = _dev_id, \ - .con_id = _con_id, \ +#define PWM_LOOKUP_WITH_MODULE(_provider, _index, _dev_id, _con_id, \ + _period, _polarity, _module) \ + { \ + .provider = _provider, \ + .index = _index, \ + .dev_id = _dev_id, \ + .con_id = _con_id, \ + .period = _period, \ + .polarity = _polarity, \ + .module = _module, \ } -#if IS_ENABLED(CONFIG_PWM) +#define PWM_LOOKUP(_provider, _index, _dev_id, _con_id, _period, _polarity) \ + PWM_LOOKUP_WITH_MODULE(_provider, _index, _dev_id, _con_id, _period, \ + _polarity, NULL) + +#if IS_REACHABLE(CONFIG_PWM) void pwm_add_table(struct pwm_lookup *table, size_t num); +void pwm_remove_table(struct pwm_lookup *table, size_t num); #else static inline void pwm_add_table(struct pwm_lookup *table, size_t num) { } -#endif -#ifdef CONFIG_PWM_SYSFS -void pwmchip_sysfs_export(struct pwm_chip *chip); -void pwmchip_sysfs_unexport(struct pwm_chip *chip); -#else -static inline void pwmchip_sysfs_export(struct pwm_chip *chip) +static inline void pwm_remove_table(struct pwm_lookup *table, size_t num) { } - -static inline void pwmchip_sysfs_unexport(struct pwm_chip *chip) -{ -} -#endif /* CONFIG_PWM_SYSFS */ +#endif #endif /* __LINUX_PWM_H */ |