diff options
| author | Uwe Kleine-König <u.kleine-koenig@pengutronix.de> | 2023-08-04 17:27:06 +0300 |
|---|---|---|
| committer | Thierry Reding <thierry.reding@gmail.com> | 2023-10-13 11:07:17 +0300 |
| commit | 384461abcab6602abc06c2dfb8fb99beeeaa12b0 (patch) | |
| tree | 357938a39c92f62573a63b7de4e0fc9b172d6760 /include/linux/pwm.h | |
| parent | 7a3663c2e41f38daf876b23504f1396317f98fee (diff) | |
| download | linux-384461abcab6602abc06c2dfb8fb99beeeaa12b0.tar.xz | |
pwm: Manage owner assignment implicitly for drivers
Instead of requiring each driver to care for assigning the owner member
of struct pwm_ops, handle that implicitly using a macro. Note that the
owner member has to be moved to struct pwm_chip, as the ops structure
usually lives in read-only memory and so cannot be modified.
The upside is that new low level drivers cannot forget the assignment and
save one line each. The pwm-crc driver didn't assign .owner, that's not
a problem in practice though as the driver cannot be compiled as a
module.
Acked-by: Andy Shevchenko <andy.shevchenko@gmail.com> # Intel LPSS
Reviewed-by: Florian Fainelli <florian.fainelli@broadcom.com> # pwm-{bcm,brcm}*.c
Acked-by: Jernej Skrabec <jernej.skrabec@gmail.com> # sun4i
Acked-by: Andi Shyti <andi.shyti@kernel.org>
Acked-by: Nobuhiro Iwamatsu <nobuhiro1.iwamatsu@toshiba.co.jp> # pwm-visconti
Acked-by: Heiko Stuebner <heiko@sntech.de> # pwm-rockchip
Acked-by: Michael Walle <michael@walle.cc> # pwm-sl28cpld
Acked-by: Neil Armstrong <neil.armstrong@linaro.org> # pwm-meson
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Link: https://lore.kernel.org/r/20230804142707.412137-2-u.kleine-koenig@pengutronix.de
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
Diffstat (limited to 'include/linux/pwm.h')
| -rw-r--r-- | include/linux/pwm.h | 10 |
1 files changed, 6 insertions, 4 deletions
diff --git a/include/linux/pwm.h b/include/linux/pwm.h index d2f9f690a9c1..56e3b7a09824 100644 --- a/include/linux/pwm.h +++ b/include/linux/pwm.h @@ -267,7 +267,6 @@ struct pwm_capture { * @get_state: get the current PWM state. This function is only * called once per PWM device when the PWM chip is * registered. - * @owner: helps prevent removal of modules exporting active PWMs */ struct pwm_ops { int (*request)(struct pwm_chip *chip, struct pwm_device *pwm); @@ -278,13 +277,13 @@ struct pwm_ops { const struct pwm_state *state); int (*get_state)(struct pwm_chip *chip, struct pwm_device *pwm, struct pwm_state *state); - struct module *owner; }; /** * struct pwm_chip - abstract a PWM controller * @dev: device providing the PWMs * @ops: callbacks for this PWM controller + * @owner: module providing this chip * @base: number of first PWM controlled by this chip * @npwm: number of PWMs controlled by this chip * @of_xlate: request a PWM device given a device tree PWM specifier @@ -295,6 +294,7 @@ struct pwm_ops { struct pwm_chip { struct device *dev; const struct pwm_ops *ops; + struct module *owner; int base; unsigned int npwm; @@ -386,10 +386,12 @@ int pwm_capture(struct pwm_device *pwm, struct pwm_capture *result, int pwm_set_chip_data(struct pwm_device *pwm, void *data); void *pwm_get_chip_data(struct pwm_device *pwm); -int pwmchip_add(struct pwm_chip *chip); +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); -int devm_pwmchip_add(struct device *dev, struct pwm_chip *chip); +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 *pwm_request_from_chip(struct pwm_chip *chip, unsigned int index, |