Re: [PATCH v4] input: Add LED support to Synaptics device

["Pali Rohár" <pali.rohar@gmail.com>]

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On Thursday 22 April 2010 08:16:42 Takashi Iwai wrote:
> diff --git a/drivers/input/mouse/Kconfig
> b/drivers/input/mouse/Kconfig index c714ca2..91d3517 100644
> --- a/drivers/input/mouse/Kconfig
> +++ b/drivers/input/mouse/Kconfig
> @@ -19,6 +19,7 @@ config MOUSE_PS2
>  	select SERIO_LIBPS2
>  	select SERIO_I8042 if X86
>  	select SERIO_GSCPS2 if GSC
> +	select LEDS_CLASS if MOUSE_PS2_SYNAPICS_LED
>  	help
>  	  Say Y here if you have a PS/2 mouse connected to your
> system. This includes the standard 2 or 3-button PS/2 mouse,
> as well as PS/2 @@ -67,6 +68,14 @@ config MOUSE_PS2_SYNAPTICS
> 
>  	  If unsure, say Y.
> 
> +config MOUSE_PS2_SYNAPTICS_LED
> +	bool "Support embedded LED on Synaptics devices"
> +	depends on MOUSE_PS2_SYNAPTICS
> +	select NEW_LEDS
> +	help
> +	  Say Y here if you have a Synaptics device with an embedded
> LED. +	  This will enable LED class driver to control the LED
> device. +
>  config MOUSE_PS2_LIFEBOOK
>  	bool "Fujitsu Lifebook PS/2 mouse protocol extension" if
> EMBEDDED default y
> diff --git a/drivers/input/mouse/synaptics.c
> b/drivers/input/mouse/synaptics.c index c7b5285..8dc1fb5
> 100644
> --- a/drivers/input/mouse/synaptics.c
> +++ b/drivers/input/mouse/synaptics.c
> @@ -28,6 +28,7 @@
>  #include <linux/input.h>
>  #include <linux/serio.h>
>  #include <linux/libps2.h>
> +#include <linux/leds.h>
>  #include <linux/slab.h>
>  #include "psmouse.h"
>  #include "synaptics.h"
> @@ -335,6 +336,110 @@ static void synaptics_pt_create(struct
> psmouse *psmouse) serio_register_port(serio);
>  }
> 
> +#ifdef CONFIG_MOUSE_PS2_SYNAPTICS_LED
> +/*
> + * LED handling:
> + * Some Synaptics devices have an embeded LED at the top-left
> corner. + */
> +
> +struct synaptics_led {
> +	struct psmouse *psmouse;
> +	struct work_struct work;
> +	struct led_classdev cdev;
> +};
> +
> +static void synaptics_set_led(struct psmouse *psmouse, int
> on) +{
> +	int i;
> +	unsigned char cmd = on ? 0x88 : 0x10;
> +
> +	ps2_begin_command(&psmouse->ps2dev);
> +	if (__ps2_command(&psmouse->ps2dev, NULL,
> PSMOUSE_CMD_SETSCALE11)) +		goto out;
> +	for (i = 6; i >= 0; i -= 2) {
> +		unsigned char d = (cmd >> i) & 3;
> +		if (__ps2_command(&psmouse->ps2dev, &d,
> PSMOUSE_CMD_SETRES)) +			goto out;
> +	}
> +	cmd = 0x0a;
> +	__ps2_command(&psmouse->ps2dev, &cmd, PSMOUSE_CMD_SETRATE);
> + out:
> +	ps2_end_command(&psmouse->ps2dev);
> +}
> +
> +static void synaptics_led_work(struct work_struct *work)
> +{
> +	struct synaptics_led *led;
> +
> +	led = container_of(work, struct synaptics_led, work);
> +	synaptics_set_led(led->psmouse, led->cdev.brightness);
> +}
> +
> +static void synaptics_led_cdev_brightness_set(struct
> led_classdev *cdev, +					      enum led_brightness 
value)
> +{
> +	struct synaptics_led *led;
> +
> +	led = container_of(cdev, struct synaptics_led, cdev);
> +	schedule_work(&led->work);
> +}
> +
> +static void synaptics_sync_led(struct psmouse *psmouse)
> +{
> +	struct synaptics_data *priv = psmouse->private;
> +
> +	if (priv->led)
> +		synaptics_set_led(psmouse, priv->led->cdev.brightness);
> +}
> +
> +static int synaptics_init_led(struct psmouse *psmouse)
> +{
> +	struct synaptics_data *priv = psmouse->private;
> +	struct synaptics_led *led;
> +	int err;
> +
> +	/* FIXME: LED is supposedly detectable in cap0c[1] 0x20, but
> it seems +	 * not working on real machines.
> +	 * So we check the product id to be sure.
> +	 */
> +	if (!priv->ext_cap_0c || SYN_CAP_PRODUCT_ID(priv->ext_cap)
> != 0xe4) +		return 0;
> +
> +	printk(KERN_INFO "synaptics: support LED control\n");
> +	led = kzalloc(sizeof(struct synaptics_led), GFP_KERNEL);
> +	if (!led)
> +		return -ENOMEM;
> +	led->psmouse = psmouse;
> +	INIT_WORK(&led->work, synaptics_led_work);
> +	led->cdev.name = "psmouse::synaptics";
> +	led->cdev.brightness_set =
> synaptics_led_cdev_brightness_set; +	led->cdev.flags =
> LED_CORE_SUSPENDRESUME;
> +	err = led_classdev_register(NULL, &led->cdev);
> +	if (err < 0) {
> +		kfree(led);
> +		return err;
> +	}
> +	priv->led = led;
> +	return 0;
> +}
> +
> +static void synaptics_free_led(struct psmouse *psmouse)
> +{
> +	struct synaptics_data *priv = psmouse->private;
> +
> +	if (!priv->led)
> +		return;
> +	cancel_work_sync(&priv->led->work);
> +	synaptics_set_led(psmouse, 0);
> +	led_classdev_unregister(&priv->led->cdev);
> +	kfree(priv->led);
> +}
> +#else
> +#define synaptics_init_led(ps)	0
> +#define synaptics_free_led(ps)	do {} while (0)
> +#define synaptics_sync_led(ps)	do {} while (0)
> +#endif
> +
>  /************************************************************
> ***************** *	Functions to interpret the absolute mode
> packets
>  
> *************************************************************
> ***************/ @@ -622,6 +727,7 @@ static void
> set_input_params(struct input_dev *dev, struct synaptics_data
> *priv)
> 
>  static void synaptics_disconnect(struct psmouse *psmouse)
>  {
> +	synaptics_free_led(psmouse);
>  	synaptics_reset(psmouse);
>  	kfree(psmouse->private);
>  	psmouse->private = NULL;
> @@ -653,6 +759,8 @@ static int synaptics_reconnect(struct
> psmouse *psmouse) return -1;
>  	}
> 
> +	synaptics_sync_led(psmouse);
> +
>  	return 0;
>  }
> 
> @@ -727,6 +835,9 @@ int synaptics_init(struct psmouse
> *psmouse) SYN_ID_MAJOR(priv->identity),
> SYN_ID_MINOR(priv->identity), priv->model_id,
> priv->capabilities, priv->ext_cap, priv->ext_cap_0c);
> 
> +	if (synaptics_init_led(psmouse) < 0)
> +		goto init_fail;
> +
>  	set_input_params(psmouse->dev, priv);
> 
>  	/*
> diff --git a/drivers/input/mouse/synaptics.h
> b/drivers/input/mouse/synaptics.h index ae37c5d..d5bb8f4
> 100644
> --- a/drivers/input/mouse/synaptics.h
> +++ b/drivers/input/mouse/synaptics.h
> @@ -94,6 +94,8 @@ struct synaptics_hw_state {
>  	signed char scroll;
>  };
> 
> +struct synaptics_led;
> +
>  struct synaptics_data {
>  	/* Data read from the touchpad */
>  	unsigned long int model_id;		/* Model-ID */
> @@ -107,6 +109,7 @@ struct synaptics_data {
>  	unsigned char pkt_type;			/* packet type - old, new, etc 
*/
>  	unsigned char mode;			/* current mode byte */
>  	int scroll;
> +	struct synaptics_led *led;
>  };
> 
>  void synaptics_module_init(void);

Hello,

what happened with this patch? There is no discussion about v4:
https://patchwork.kernel.org/patch/94026/
https://lkml.org/lkml/2010/4/22/35

Are there any problems with this patch?

-- 
Pali Rohár
pali.rohar@gmail.com

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