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Date: Tue, 28 Aug 2012 08:47:22 +0530
From: anish singh <anish198519851985@...il.com>
To: linux-kernel-mail <linux-kernel@...r.kernel.org>,
Neil Brown <neilb@...e.de>
Cc: linux-input@...r.kernel.org
Subject: Re: [PATCH] [RFC]Extcon: Change to add standard cable names in
individual drivers.
Hi,
Here is the requirement:
driver has to give the core the list of standard cable names(exported by
the core) and can also specify the custom cable names.
Something as this :
char *cable_names_supported = {
[0] = EXTCON_USB, /*defined in extcon core */
[1] = EXTCON_HEADSET,/*defined in extcon core */
[2] = CUSTOM_CABLE /*Not defined in extcon core */
}
As of now this is not possible because of some limitations in the extcon core.
So, I proposed this attached patch(with limitations) and below is the gist:
In the core( .C file):
char *cable_name[] = { "USB",
"Cable1",
"Cable2",
......
}
In the core ( .h file):
enum cable_name{
USB = 0,
CABLE1,
CABLE2,
}
enum cable_name_support{
USB_SUPPORT = 1<<USB,
CABLE1 = 1 << CABLE1,
CABLE2 = 1 << CABLE2,
}
and driver can use it this way:
list_of_cable = EXTCON_MIC_IN_SUPPORT |
EXTCON_HEADPHONE_OUT_SUPPORT |
EXTCON_MECHANICAL_SUPPORT;
Limitations of this patch:
1. We can't specify the custom cable names and
2. It can't grow beyond 32.
One more approach that comes to mind is using the #defines
for all the cable names but that looks ugly.
Is there any better approach to make it work?
-a-n-i-s-h-
On Sat, Aug 25, 2012 at 7:44 PM, anish kumar
<anish198519851985@...il.com> wrote:
> From: anish kumar <anish198519851985@...il.com>
>
> Right now we are forced to define our own cable names instead of what
> is exported by extcon framework.We should use the standard cable
> names.With this change, individual drivers can define cable names
> as below:
>
> edev.list_of_cable = EXTCON_MIC_IN_SUPPORT |
> EXTCON_HEADPHONE_OUT_SUPPORT |
> EXTCON_MECHANICAL_SUPPORT;
> Signed-off-by: anish kumar <anish198519851985@...il.com>
> ---
> drivers/extcon/extcon-arizona.c | 11 +++--------
> drivers/extcon/extcon-class.c | 35 +++++++++++++++++++++++++----------
> include/linux/extcon.h | 29 ++++++++++++++++++++++++++++-
> 3 files changed, 56 insertions(+), 19 deletions(-)
>
> diff --git a/drivers/extcon/extcon-arizona.c b/drivers/extcon/extcon-arizona.c
> index fa2114f..7a690f2 100644
> --- a/drivers/extcon/extcon-arizona.c
> +++ b/drivers/extcon/extcon-arizona.c
> @@ -74,13 +74,6 @@ static struct {
> #define ARIZONA_CABLE_MICROPHONE 1
> #define ARIZONA_CABLE_HEADPHONE 2
>
> -static const char *arizona_cable[] = {
> - "Mechanical",
> - "Microphone",
> - "Headphone",
> - NULL,
> -};
> -
> static void arizona_extcon_set_mode(struct arizona_extcon_info *info, int mode)
> {
> struct arizona *arizona = info->arizona;
> @@ -381,7 +374,9 @@ static int __devinit arizona_extcon_probe(struct platform_device *pdev)
> }
>
> info->edev.name = "Headset Jack";
> - info->edev.supported_cable = arizona_cable;
> + info->edev.list_of_cable = EXTCON_MIC_IN_SUPPORT |
> + EXTCON_HEADPHONE_OUT_SUPPORT |
> + EXTCON_MECHANICAL_SUPPORT;
>
> ret = extcon_dev_register(&info->edev, arizona->dev);
> if (ret < 0) {
> diff --git a/drivers/extcon/extcon-class.c b/drivers/extcon/extcon-class.c
> index 481cfa0..22aa4b8 100644
> --- a/drivers/extcon/extcon-class.c
> +++ b/drivers/extcon/extcon-class.c
> @@ -95,7 +95,7 @@ static int check_mutually_exclusive(struct extcon_dev *edev, u32 new_state)
> u32 correspondants = new_state & edev->mutually_exclusive[i];
> u32 exp = 1;
>
> - for (j = 0; j < 32; j++) {
> + for (j = 0; j < SUPPORTED_CABLE_MAX; j++) {
> if (exp & correspondants)
> count++;
> if (count > 1)
> @@ -580,6 +580,7 @@ static void extcon_cleanup(struct extcon_dev *edev, bool skip)
> put_device(edev->dev);
> }
>
> + kfree(edev->supported_cable);
> kfree(edev->dev);
> }
>
> @@ -607,7 +608,7 @@ static void dummy_sysfs_dev_release(struct device *dev)
> */
> int extcon_dev_register(struct extcon_dev *edev, struct device *dev)
> {
> - int ret, index = 0;
> + int ret, index = 0, i = 0;
>
> if (!extcon_class) {
> ret = create_extcon_class();
> @@ -615,23 +616,36 @@ int extcon_dev_register(struct extcon_dev *edev, struct device *dev)
> return ret;
> }
>
> - if (edev->supported_cable) {
> - /* Get size of array */
> - for (index = 0; edev->supported_cable[index]; index++)
> - ;
> - edev->max_supported = index;
> - } else {
> - edev->max_supported = 0;
> + edev->max_supported = 0;
> +
> + /* get the total number of cables */
> + for_each_set_bit(i, &edev->list_of_cable, BITS_PER_LONG) {
> + index++;
> }
> + edev->max_supported = index;
>
> if (index > SUPPORTED_CABLE_MAX) {
> dev_err(edev->dev, "extcon: maximum number of supported cables exceeded.\n");
> return -EINVAL;
> }
>
> + edev->supported_cable = kzalloc(sizeof(char *) * index, GFP_KERNEL);
> + if (!edev->supported_cable) {
> + pr_err("extcon supported cable allocation failed\n");
> + return -ENOMEM;
> + }
> +
> + index = 0;
> + for_each_set_bit(i, &edev->list_of_cable, BITS_PER_LONG) {
> + edev->supported_cable[index++] = extcon_cable_name[i];
> + }
> +
> edev->dev = kzalloc(sizeof(struct device), GFP_KERNEL);
> - if (!edev->dev)
> + if (!edev->dev) {
> + pr_err("extcon device allocation failed\n");
> return -ENOMEM;
> + }
> +
> edev->dev->parent = dev;
> edev->dev->class = extcon_class;
> edev->dev->release = extcon_dev_release;
> @@ -799,6 +813,7 @@ err_alloc_cables:
> if (edev->max_supported)
> kfree(edev->cables);
> err_sysfs_alloc:
> + kfree(edev->supported_cable);
> kfree(edev->dev);
> return ret;
> }
> diff --git a/include/linux/extcon.h b/include/linux/extcon.h
> index cdd4014..65cc23a 100644
> --- a/include/linux/extcon.h
> +++ b/include/linux/extcon.h
> @@ -70,6 +70,32 @@ enum extcon_cable_name {
> };
> extern const char *extcon_cable_name[];
>
> +/* Please use this enum's to add support for cables in your drivers
> + * Please add any other "standard" cables used with extcon dev.
> + */
> +enum extcon_cable_name_support {
> + EXTCON_USB_SUPPORT = 1 << EXTCON_USB,
> + EXTCON_USB_HOST_SUPPORT = 1 << EXTCON_USB_HOST,
> + EXTCON_TA_SUPPORT = 1 << EXTCON_TA,
> + EXTCON_FAST_CHARGER_SUPPORT = 1 << EXTCON_FAST_CHARGER,
> + EXTCON_SLOW_CHARGER_SUPPORT = 1 << EXTCON_SLOW_CHARGER,
> + EXTCON_CHARGE_DOWNSTREAM_SUPPORT = 1 << EXTCON_CHARGE_DOWNSTREAM,
> + EXTCON_HDMI_SUPPORT = 1 << EXTCON_HDMI,
> + EXTCON_MHL_SUPPORT = 1 << EXTCON_MHL,
> + EXTCON_DVI_SUPPORT = 1 << EXTCON_DVI,
> + EXTCON_VGA_SUPPORT = 1 << EXTCON_VGA,
> + EXTCON_DOCK_SUPPORT = 1 << EXTCON_DOCK,
> + EXTCON_LINE_IN_SUPPORT = 1 << EXTCON_LINE_IN,
> + EXTCON_LINE_OUT_SUPPORT = 1 << EXTCON_LINE_OUT,
> + EXTCON_MIC_IN_SUPPORT = 1 << EXTCON_MIC_IN,
> + EXTCON_HEADPHONE_OUT_SUPPORT = 1 << EXTCON_HEADPHONE_OUT,
> + EXTCON_SPDIF_IN_SUPPORT = 1 << EXTCON_SPDIF_IN,
> + EXTCON_SPDIF_OUT_SUPPORT = 1 << EXTCON_SPDIF_OUT,
> + EXTCON_VIDEO_IN_SUPPORT = 1 << EXTCON_VIDEO_IN,
> + EXTCON_VIDEO_OUT_SUPPORT = 1 << EXTCON_VIDEO_OUT,
> + EXTCON_MECHANICAL_SUPPORT = 1 << EXTCON_MECHANICAL,
> +};
> +
> struct extcon_cable;
>
> /**
> @@ -111,7 +137,7 @@ struct extcon_cable;
> struct extcon_dev {
> /* --- Optional user initializing data --- */
> const char *name;
> - const char **supported_cable;
> + unsigned long list_of_cable;
> const u32 *mutually_exclusive;
>
> /* --- Optional callbacks to override class functions --- */
> @@ -120,6 +146,7 @@ struct extcon_dev {
>
> /* --- Internal data. Please do not set. --- */
> struct device *dev;
> + const char **supported_cable;
> u32 state;
> struct raw_notifier_head nh;
> struct list_head entry;
> --
> 1.7.1
>
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