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Date: Tue, 11 Aug 2015 11:42:35 +0200 (CEST)
From: Peter Meerwald <p.meerwald@...-electronic.com>
To: Jacek Anaszewski <j.anaszewski@...sung.com>
cc: linux-leds@...r.kernel.org, linux-kernel@...r.kernel.org,
cooloney@...il.com, rpurdie@...ys.net, stsp@...rs.sourceforge.net,
Andrew Lunn <andrew@...n.ch>,
Ricardo Ribalda <ricardo.ribalda@...il.com>
Subject: Re: [PATCH/RFC v5 25/57] leds: pca963x: Remove work queue
> Now the core implements the work queue, remove it from the drivers.
nice!
> Signed-off-by: Andrew Lunn <andrew@...n.ch>
> Signed-off-by: Jacek Anaszewski <j.anaszewski@...sung.com>
> Cc: Peter Meerwald <p.meerwald@...-electronic.com>
> Cc: Ricardo Ribalda <ricardo.ribalda@...il.com>
Acked-by: Peter Meerwald <p.meerwald@...-electronic.com>
> ---
> drivers/leds/leds-pca963x.c | 57 +++++++------------------------------------
> 1 file changed, 9 insertions(+), 48 deletions(-)
>
> diff --git a/drivers/leds/leds-pca963x.c b/drivers/leds/leds-pca963x.c
> index 3f63a1b..662d813 100644
> --- a/drivers/leds/leds-pca963x.c
> +++ b/drivers/leds/leds-pca963x.c
> @@ -32,7 +32,6 @@
> #include <linux/leds.h>
> #include <linux/err.h>
> #include <linux/i2c.h>
> -#include <linux/workqueue.h>
> #include <linux/slab.h>
> #include <linux/of.h>
> #include <linux/platform_data/leds-pca963x.h>
> @@ -96,11 +95,6 @@ static const struct i2c_device_id pca963x_id[] = {
> };
> MODULE_DEVICE_TABLE(i2c, pca963x_id);
>
> -enum pca963x_cmd {
> - BRIGHTNESS_SET,
> - BLINK_SET,
> -};
> -
> struct pca963x_led;
>
> struct pca963x {
> @@ -112,17 +106,16 @@ struct pca963x {
>
> struct pca963x_led {
> struct pca963x *chip;
> - struct work_struct work;
> enum led_brightness brightness;
> struct led_classdev led_cdev;
> int led_num; /* 0 .. 15 potentially */
> - enum pca963x_cmd cmd;
> char name[32];
> u8 gdc;
> u8 gfrq;
> };
>
> -static void pca963x_brightness_work(struct pca963x_led *pca963x)
> +static void pca963x_brightness(struct pca963x_led *pca963x,
> + enum led_brightness brightness)
> {
> u8 ledout_addr = pca963x->chip->chipdef->ledout_base
> + (pca963x->led_num / 4);
> @@ -132,7 +125,7 @@ static void pca963x_brightness_work(struct pca963x_led *pca963x)
>
> mutex_lock(&pca963x->chip->mutex);
> ledout = i2c_smbus_read_byte_data(pca963x->chip->client, ledout_addr);
> - switch (pca963x->brightness) {
> + switch (brightness) {
> case LED_FULL:
> i2c_smbus_write_byte_data(pca963x->chip->client, ledout_addr,
> (ledout & ~mask) | (PCA963X_LED_ON << shift));
> @@ -152,7 +145,7 @@ static void pca963x_brightness_work(struct pca963x_led *pca963x)
> mutex_unlock(&pca963x->chip->mutex);
> }
>
> -static void pca963x_blink_work(struct pca963x_led *pca963x)
> +static void pca963x_blink(struct pca963x_led *pca963x)
> {
> u8 ledout_addr = pca963x->chip->chipdef->ledout_base +
> (pca963x->led_num / 4);
> @@ -180,21 +173,6 @@ static void pca963x_blink_work(struct pca963x_led *pca963x)
> mutex_unlock(&pca963x->chip->mutex);
> }
>
> -static void pca963x_work(struct work_struct *work)
> -{
> - struct pca963x_led *pca963x = container_of(work,
> - struct pca963x_led, work);
> -
> - switch (pca963x->cmd) {
> - case BRIGHTNESS_SET:
> - pca963x_brightness_work(pca963x);
> - break;
> - case BLINK_SET:
> - pca963x_blink_work(pca963x);
> - break;
> - }
> -}
> -
> static void pca963x_led_set(struct led_classdev *led_cdev,
> enum led_brightness value)
> {
> @@ -202,14 +180,7 @@ static void pca963x_led_set(struct led_classdev *led_cdev,
>
> pca963x = container_of(led_cdev, struct pca963x_led, led_cdev);
>
> - pca963x->cmd = BRIGHTNESS_SET;
> - pca963x->brightness = value;
> -
> - /*
> - * Must use workqueue for the actual I/O since I2C operations
> - * can sleep.
> - */
> - schedule_work(&pca963x->work);
> + pca963x_brightness(pca963x, value);
> }
>
> static int pca963x_blink_set(struct led_classdev *led_cdev,
> @@ -254,15 +225,10 @@ static int pca963x_blink_set(struct led_classdev *led_cdev,
> */
> gfrq = (period * 24 / 1000) - 1;
>
> - pca963x->cmd = BLINK_SET;
> pca963x->gdc = gdc;
> pca963x->gfrq = gfrq;
>
> - /*
> - * Must use workqueue for the actual I/O since I2C operations
> - * can sleep.
> - */
> - schedule_work(&pca963x->work);
> + pca963x_blink(pca963x);
>
> *delay_on = time_on;
> *delay_off = time_off;
> @@ -409,12 +375,11 @@ static int pca963x_probe(struct i2c_client *client,
>
> pca963x[i].led_cdev.name = pca963x[i].name;
> pca963x[i].led_cdev.brightness_set = pca963x_led_set;
> + pca963x[i].led_cdev.flags |= LED_BRIGHTNESS_BLOCKING;
>
> if (pdata && pdata->blink_type == PCA963X_HW_BLINK)
> pca963x[i].led_cdev.blink_set = pca963x_blink_set;
>
> - INIT_WORK(&pca963x[i].work, pca963x_work);
> -
> err = led_classdev_register(&client->dev, &pca963x[i].led_cdev);
> if (err < 0)
> goto exit;
> @@ -434,10 +399,8 @@ static int pca963x_probe(struct i2c_client *client,
> return 0;
>
> exit:
> - while (i--) {
> + while (i--)
> led_classdev_unregister(&pca963x[i].led_cdev);
> - cancel_work_sync(&pca963x[i].work);
> - }
>
> return err;
> }
> @@ -447,10 +410,8 @@ static int pca963x_remove(struct i2c_client *client)
> struct pca963x *pca963x = i2c_get_clientdata(client);
> int i;
>
> - for (i = 0; i < pca963x->chipdef->n_leds; i++) {
> + for (i = 0; i < pca963x->chipdef->n_leds; i++)
> led_classdev_unregister(&pca963x->leds[i].led_cdev);
> - cancel_work_sync(&pca963x->leds[i].work);
> - }
>
> return 0;
> }
>
--
Peter Meerwald
+43-664-2444418 (mobile)
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