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Date: Wed, 22 Jun 2011 11:20:16 +0200
From: Corentin Chary <corentin.chary@...il.com>
To: Ike Panhc <ike.pan@...onical.com>
Cc: linux-kernel@...r.kernel.org, platform-driver-x86@...r.kernel.org,
Matthew Garrett <mjg@...hat.com>,
Richard Purdie <rpurdie@...ys.net>
Subject: Re: [PATCH 3/3] ideapad: add backlight driver
On Wed, Jun 22, 2011 at 10:07 AM, Ike Panhc <ike.pan@...onical.com> wrote:
> When acpi_backlight=vendor in cmdline or no backlight support in acpi video
> device, ideapad-laptop will register backlight device and control brightness
> and backlight power via the command in VPC2004.
>
> Signed-off-by: Ike Panhc <ike.pan@...onical.com>
> ---
> drivers/platform/x86/ideapad-laptop.c | 129 ++++++++++++++++++++++++++++++---
> 1 files changed, 119 insertions(+), 10 deletions(-)
>
> diff --git a/drivers/platform/x86/ideapad-laptop.c b/drivers/platform/x86/ideapad-laptop.c
> index 678bbf7..018c457 100644
> --- a/drivers/platform/x86/ideapad-laptop.c
> +++ b/drivers/platform/x86/ideapad-laptop.c
> @@ -32,6 +32,8 @@
> #include <linux/platform_device.h>
> #include <linux/input.h>
> #include <linux/input/sparse-keymap.h>
> +#include <linux/backlight.h>
> +#include <linux/fb.h>
>
> #define IDEAPAD_RFKILL_DEV_NUM (3)
>
> @@ -44,6 +46,7 @@ struct ideapad_private {
> struct rfkill *rfk[IDEAPAD_RFKILL_DEV_NUM];
> struct platform_device *platform_device;
> struct input_dev *inputdev;
> + struct backlight_device *blightdev;
> unsigned long cfg;
> };
>
> @@ -257,9 +260,8 @@ static struct rfkill_ops ideapad_rfk_ops = {
> .set_block = ideapad_rfk_set,
> };
>
> -static void ideapad_sync_rfk_state(struct acpi_device *adevice)
> +static void ideapad_sync_rfk_state(struct ideapad_private *priv)
> {
> - struct ideapad_private *priv = dev_get_drvdata(&adevice->dev);
> unsigned long hw_blocked;
> int i;
>
> @@ -309,8 +311,7 @@ static int __devinit ideapad_register_rfkill(struct acpi_device *adevice,
> return 0;
> }
>
> -static void __devexit ideapad_unregister_rfkill(struct acpi_device *adevice,
> - int dev)
> +static void ideapad_unregister_rfkill(struct acpi_device *adevice, int dev)
> {
> struct ideapad_private *priv = dev_get_drvdata(&adevice->dev);
>
> @@ -418,6 +419,97 @@ static void ideapad_input_report(struct ideapad_private *priv,
> }
>
> /*
> + * backlight
> + */
> +static int ideapad_backlight_get_brightness(struct backlight_device *blightdev)
> +{
> + unsigned long now;
> +
> + if (read_ec_data(ideapad_handle, 0x12, &now))
> + return -EAGAIN;
> + return now;
> +}
> +
> +static int ideapad_backlight_update_status(struct backlight_device *blightdev)
> +{
> + if (write_ec_cmd(ideapad_handle, 0x13, blightdev->props.brightness))
> + return -EAGAIN;
> + if (write_ec_cmd(ideapad_handle, 0x33,
> + blightdev->props.power == FB_BLANK_POWERDOWN ? 0 : 1))
> + return -EAGAIN;
> +
> + return 0;
> +}
I don't think -EAGAIN is a good idea here ... Why not -EIO ?
> +static const struct backlight_ops ideapad_backlight_ops = {
> + .get_brightness = ideapad_backlight_get_brightness,
> + .update_status = ideapad_backlight_update_status,
> +};
> +
> +static int ideapad_backlight_init(struct ideapad_private *priv)
> +{
> + struct backlight_device *blightdev;
> + struct backlight_properties props;
> + unsigned long max, now, power;
> +
> + if (read_ec_data(ideapad_handle, 0x11, &max))
> + return -EAGAIN;
> + if (read_ec_data(ideapad_handle, 0x12, &now))
> + return -EAGAIN;
> + if (read_ec_data(ideapad_handle, 0x18, &power))
> + return -EAGAIN;
Same
> + memset(&props, 0, sizeof(struct backlight_properties));
> + props.max_brightness = max;
You forgot to set backlight type, "props.type = BACKLIGHT_PLATFORM;"
> + blightdev = backlight_device_register("ideapad",
> + &priv->platform_device->dev,
> + priv,
> + &ideapad_backlight_ops,
> + &props);
> + if (IS_ERR(blightdev)) {
> + pr_err("Could not register backlight device\n");
> + return PTR_ERR(blightdev);
> + }
> +
> + priv->blightdev = blightdev;
> + blightdev->props.brightness = now;
> + blightdev->props.power = power ? FB_BLANK_UNBLANK : FB_BLANK_POWERDOWN;
> + backlight_update_status(blightdev);
> +
> + return 0;
> +}
> +
> +static void ideapad_backlight_exit(struct ideapad_private *priv)
> +{
> + if (priv->blightdev)
> + backlight_device_unregister(priv->blightdev);
> + priv->blightdev = NULL;
> +}
> +
> +static void ideapad_backlight_notify_power(struct ideapad_private *priv)
> +{
> + unsigned long power;
> + struct backlight_device *blightdev = priv->blightdev;
> +
> + if (read_ec_data(ideapad_handle, 0x18, &power))
> + return;
> + blightdev->props.power = power ? FB_BLANK_UNBLANK : FB_BLANK_POWERDOWN;
> +}
> +
> +static void ideapad_backlight_notify_brightness(struct ideapad_private *priv)
> +{
> + unsigned long now;
> +
> + /* if we control brightness via acpi video driver */
> + if (priv->blightdev == NULL) {
> + read_ec_data(ideapad_handle, 0x12, &now);
> + return;
> + }
> +
> + backlight_force_update(priv->blightdev, BACKLIGHT_UPDATE_HOTKEY);
> +}
> +
> +/*
> * module init/exit
> */
> static const struct acpi_device_id ideapad_device_ids[] = {
> @@ -456,10 +548,19 @@ static int __devinit ideapad_acpi_add(struct acpi_device *adevice)
> else
> priv->rfk[i] = NULL;
> }
> - ideapad_sync_rfk_state(adevice);
> + ideapad_sync_rfk_state(priv);
> +
> + if (!acpi_video_backlight_support()) {
> + ret = ideapad_backlight_init(priv);
> + if (ret && ret != -ENODEV)
> + goto backlight_failed;
> + }
>
> return 0;
>
> +backlight_failed:
> + for (i = 0; i < IDEAPAD_RFKILL_DEV_NUM; i++)
> + ideapad_unregister_rfkill(adevice, i);
> input_failed:
> ideapad_platform_exit(priv);
> platform_failed:
> @@ -472,6 +573,7 @@ static int __devexit ideapad_acpi_remove(struct acpi_device *adevice, int type)
> struct ideapad_private *priv = dev_get_drvdata(&adevice->dev);
> int i;
>
> + ideapad_backlight_exit(priv);
> for (i = 0; i < IDEAPAD_RFKILL_DEV_NUM; i++)
> ideapad_unregister_rfkill(adevice, i);
> ideapad_input_exit(priv);
> @@ -496,12 +598,19 @@ static void ideapad_acpi_notify(struct acpi_device *adevice, u32 event)
> vpc1 = (vpc2 << 8) | vpc1;
> for (vpc_bit = 0; vpc_bit < 16; vpc_bit++) {
> if (test_bit(vpc_bit, &vpc1)) {
> - if (vpc_bit == 9)
> - ideapad_sync_rfk_state(adevice);
> - else if (vpc_bit == 4)
> - read_ec_data(handle, 0x12, &vpc2);
> - else
> + switch (vpc_bit) {
> + case 9:
> + ideapad_sync_rfk_state(priv);
> + break;
> + case 4:
> + ideapad_backlight_notify_brightness(priv);
> + break;
> + case 2:
> + ideapad_backlight_notify_power(priv);
> + break;
> + default:
> ideapad_input_report(priv, vpc_bit);
> + }
> }
> }
> }
> --
> 1.7.4.1
>
>
Otherwise, looks ok
--
Corentin Chary
http://xf.iksaif.net
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