Re: [PATCH v2] fbdev/media: Use GPIO descriptors for VIA GPIO
From: Helge Deller <deller@gmx.de>
Date: 2023-06-19 06:18:01
Also in:
dri-devel, linux-media
On 6/13/23 08:33, Linus Walleij wrote:
The VIA fbdev exposes a custom GPIO chip for its GPIOs, these are in turn looked up the camera driver using a custom API. Drop the custom API, provide a look-up table and convert to GPIO descriptors. Note proper polarity on the RESET line. Cc: Jonathan Corbet <corbet@lwn.net> Signed-off-by: Linus Walleij <redacted> --- ChangeLog v1->v2: - Fix a missed include (I guess I had an old compiled object that just worked...) I don't know about the merge path for this one, let's merge it in the provider (fbdev) if possible.
I've applied it to the fbdev git tree. Thanks! Helge
quoted hunk ↗ jump to hunk
This looks like OLPC stuff. --- drivers/media/platform/via/via-camera.c | 51 ++++++++----------- drivers/video/fbdev/via/via-core.c | 2 +- drivers/video/fbdev/via/via-gpio.c | 28 +++++----- .../video/fbdev/via}/via-gpio.h | 1 - 4 files changed, 35 insertions(+), 47 deletions(-) rename {include/linux => drivers/video/fbdev/via}/via-gpio.h (84%)diff --git a/drivers/media/platform/via/via-camera.c b/drivers/media/platform/via/via-camera.c index 450254403fa8..4cb8f29e2f14 100644 --- a/drivers/media/platform/via/via-camera.c +++ b/drivers/media/platform/via/via-camera.c@@ -11,7 +11,7 @@ #include <linux/device.h> #include <linux/list.h> #include <linux/pci.h> -#include <linux/gpio.h> +#include <linux/gpio/consumer.h> #include <linux/interrupt.h> #include <linux/platform_device.h> #include <linux/videodev2.h>@@ -26,7 +26,6 @@ #include <linux/dma-mapping.h> #include <linux/pm_qos.h> #include <linux/via-core.h> -#include <linux/via-gpio.h> #include <linux/via_i2c.h> #ifdef CONFIG_X86@@ -71,8 +70,8 @@ struct via_camera { /* * GPIO info for power/reset management */ - int power_gpio; - int reset_gpio; + struct gpio_desc *power_gpio; + struct gpio_desc *reset_gpio; /* * I/O memory stuff. */@@ -180,27 +179,19 @@ static struct via_format *via_find_format(u32 pixelformat) */ static int via_sensor_power_setup(struct via_camera *cam) { - int ret; + struct device *dev = &cam->platdev->dev; + + cam->power_gpio = devm_gpiod_get(dev, "VGPIO3", GPIOD_OUT_LOW); + if (IS_ERR(cam->power_gpio)) + return dev_err_probe(dev, PTR_ERR(cam->power_gpio), + "failed to get power GPIO"); + + /* Request the reset line asserted */ + cam->reset_gpio = devm_gpiod_get(dev, "VGPIO2", GPIOD_OUT_HIGH); + if (IS_ERR(cam->reset_gpio)) + return dev_err_probe(dev, PTR_ERR(cam->reset_gpio), + "failed to get reset GPIO"); - cam->power_gpio = viafb_gpio_lookup("VGPIO3"); - cam->reset_gpio = viafb_gpio_lookup("VGPIO2"); - if (!gpio_is_valid(cam->power_gpio) || !gpio_is_valid(cam->reset_gpio)) { - dev_err(&cam->platdev->dev, "Unable to find GPIO lines\n"); - return -EINVAL; - } - ret = gpio_request(cam->power_gpio, "viafb-camera"); - if (ret) { - dev_err(&cam->platdev->dev, "Unable to request power GPIO\n"); - return ret; - } - ret = gpio_request(cam->reset_gpio, "viafb-camera"); - if (ret) { - dev_err(&cam->platdev->dev, "Unable to request reset GPIO\n"); - gpio_free(cam->power_gpio); - return ret; - } - gpio_direction_output(cam->power_gpio, 0); - gpio_direction_output(cam->reset_gpio, 0); return 0; }@@ -209,25 +200,23 @@ static int via_sensor_power_setup(struct via_camera *cam) */ static void via_sensor_power_up(struct via_camera *cam) { - gpio_set_value(cam->power_gpio, 1); - gpio_set_value(cam->reset_gpio, 0); + gpiod_set_value(cam->power_gpio, 1); + gpiod_set_value(cam->reset_gpio, 1); msleep(20); /* Probably excessive */ - gpio_set_value(cam->reset_gpio, 1); + gpiod_set_value(cam->reset_gpio, 0); msleep(20); } static void via_sensor_power_down(struct via_camera *cam) { - gpio_set_value(cam->power_gpio, 0); - gpio_set_value(cam->reset_gpio, 0); + gpiod_set_value(cam->power_gpio, 0); + gpiod_set_value(cam->reset_gpio, 1); } static void via_sensor_power_release(struct via_camera *cam) { via_sensor_power_down(cam); - gpio_free(cam->power_gpio); - gpio_free(cam->reset_gpio); } /* --------------------------------------------------------------------------*/diff --git a/drivers/video/fbdev/via/via-core.c b/drivers/video/fbdev/via/via-core.c index 2c1803eb196f..908524a74a38 100644 --- a/drivers/video/fbdev/via/via-core.c +++ b/drivers/video/fbdev/via/via-core.c@@ -11,7 +11,7 @@ #include <linux/aperture.h> #include <linux/via-core.h> #include <linux/via_i2c.h> -#include <linux/via-gpio.h> +#include "via-gpio.h" #include "global.h" #include <linux/module.h>diff --git a/drivers/video/fbdev/via/via-gpio.c b/drivers/video/fbdev/via/via-gpio.c index f1b670397c02..2719943c06f4 100644 --- a/drivers/video/fbdev/via/via-gpio.c +++ b/drivers/video/fbdev/via/via-gpio.c@@ -7,10 +7,11 @@ #include <linux/spinlock.h> #include <linux/gpio/driver.h> +#include <linux/gpio/machine.h> #include <linux/platform_device.h> #include <linux/via-core.h> -#include <linux/via-gpio.h> #include <linux/export.h> +#include "via-gpio.h" /* * The ports we know about. Note that the port-25 gpios are not@@ -189,19 +190,14 @@ static struct viafb_pm_hooks viafb_gpio_pm_hooks = { }; #endif /* CONFIG_PM */ -/* - * Look up a specific gpio and return the number it was assigned. - */ -int viafb_gpio_lookup(const char *name) -{ - int i; - - for (i = 0; i < viafb_gpio_config.gpio_chip.ngpio; i++) - if (!strcmp(name, viafb_gpio_config.active_gpios[i]->vg_name)) - return viafb_gpio_config.gpio_chip.base + i; - return -1; -} -EXPORT_SYMBOL_GPL(viafb_gpio_lookup); +static struct gpiod_lookup_table viafb_gpio_table = { + .dev_id = "viafb-camera", + .table = { + GPIO_LOOKUP("via-gpio", 2, "VGPIO2", GPIO_ACTIVE_LOW), + GPIO_LOOKUP("via-gpio", 3, "VGPIO3", GPIO_ACTIVE_HIGH), + { } + }, +}; /* * Platform device stuff.@@ -249,12 +245,16 @@ static int viafb_gpio_probe(struct platform_device *platdev) * Get registered. */ viafb_gpio_config.gpio_chip.base = -1; /* Dynamic */ + viafb_gpio_config.gpio_chip.label = "via-gpio"; ret = gpiochip_add_data(&viafb_gpio_config.gpio_chip, &viafb_gpio_config); if (ret) { printk(KERN_ERR "viafb: failed to add gpios (%d)\n", ret); viafb_gpio_config.gpio_chip.ngpio = 0; } + + gpiod_add_lookup_table(&viafb_gpio_table); + #ifdef CONFIG_PM viafb_pm_register(&viafb_gpio_pm_hooks); #endifdiff --git a/include/linux/via-gpio.h b/drivers/video/fbdev/via/via-gpio.h similarity index 84% rename from include/linux/via-gpio.h rename to drivers/video/fbdev/via/via-gpio.h index ac34668fd442..2ffedf282f7e 100644 --- a/include/linux/via-gpio.h +++ b/drivers/video/fbdev/via/via-gpio.h@@ -8,7 +8,6 @@ #ifndef __VIA_GPIO_H__ #define __VIA_GPIO_H__ -extern int viafb_gpio_lookup(const char *name); extern int viafb_gpio_init(void); extern void viafb_gpio_exit(void); #endif