From mboxrd@z Thu Jan  1 00:00:00 1970
From: Nishanth Menon <nm@ti.com>
Subject: Re: [RFC] [PATCHv2 2/2] SFH7741: Proximity sensor board support.
Date: Wed, 12 May 2010 08:22:31 -0500
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To: "Datta, Shubhrajyoti" <shubhrajyoti@ti.com>
Cc: "linux-input@vger.kernel.org" <linux-input@vger.kernel.org>, "linux-omap@vger.kernel.org" <linux-omap@vger.kernel.org>

Datta, Shubhrajyoti had written, on 05/12/2010 03:52 AM, the following:
> Adding board support for the proximity sensor.
> 
> Signed-off-by: Shubhrajyoti D <shubhrajyoti@ti.com>
> ---
>  arch/arm/mach-omap2/board-4430sdp.c |   71 +++++++++++++++++++++++++++++++++++
>  1 files changed, 71 insertions(+), 0 deletions(-)
> 
> diff --git a/arch/arm/mach-omap2/board-4430sdp.c b/arch/arm/mach-omap2/board-4430sdp.c
> index b88f28c..beb3059 100644
> --- a/arch/arm/mach-omap2/board-4430sdp.c
> +++ b/arch/arm/mach-omap2/board-4430sdp.c
> @@ -18,6 +18,7 @@
>  #include <linux/io.h>
>  #include <linux/gpio.h>
>  #include <linux/usb/otg.h>
> +#include <linux/input/sfh7741.h>
>  
>  #include <mach/hardware.h>
>  #include <asm/mach-types.h>
> @@ -31,7 +32,25 @@
>  #include <plat/usb.h>
>  #include <asm/hardware/gic.h>
>  #include <asm/hardware/cache-l2x0.h>
> +#define OMAP4_SFH7741_SENSOR_OUTPUT_GPIO	184
> +#define OMAP4_SFH7741_ENABLE_GPIO		188
> +static void omap_prox_activate(int state);
> +static int omap_prox_read(void);
> +
> +static struct sfh7741_platform_data omap_sfh7741_data = {
> +		.irq = OMAP_GPIO_IRQ(OMAP4_SFH7741_SENSOR_OUTPUT_GPIO),
> +		.prox_enable = 1,
> +		.activate_func = omap_prox_activate,
> +		.read_prox = omap_prox_read,
> +};
>  
> +static struct platform_device sdp4430_proximity_device = {
> +	.name		= "sfh7741",
> +	.id		= 1,
> +	.dev		= {
> +		.platform_data = &omap_sfh7741_data,
> +	},
> +};
>  static struct platform_device sdp4430_lcd_device = {
>  	.name		= "sdp4430_lcd",
>  	.id		= -1,
> @@ -39,6 +58,7 @@ static struct platform_device sdp4430_lcd_device = {
>  
>  static struct platform_device *sdp4430_devices[] __initdata = {
>  	&sdp4430_lcd_device,
> +	&sdp4430_proximity_device,
>  };
>  
>  static struct omap_lcd_config sdp4430_lcd_config __initdata = {
> @@ -111,6 +131,56 @@ static struct omap_musb_board_data musb_board_data = {
>  	.power			= 100,
>  };
>  
> +static void omap_prox_activate(int state)
> +{
> +	gpio_set_value(OMAP4_SFH7741_ENABLE_GPIO , state);
> +}
> +
> +static int omap_prox_read(void)
> +{
> +	int proximity;
> +	proximity = gpio_get_value(OMAP4_SFH7741_SENSOR_OUTPUT_GPIO);
> +	return proximity;
> +}
> +
> +static void omap_sfh7741prox_init(void)
> +{
> +	char *desc = "sfh7741";
> +	int  error;
> +
> +	error = gpio_request(OMAP4_SFH7741_SENSOR_OUTPUT_GPIO, "sfh7741");
> +	if (error < 0) {
> +		pr_err("%s: GPIO configuration failed: GPIO %d, error %d\n"
> +			, __func__, OMAP4_SFH7741_SENSOR_OUTPUT_GPIO, error);
> +		return ;
> +	}
> +
> +	error = gpio_direction_input(OMAP4_SFH7741_SENSOR_OUTPUT_GPIO);
> +	if (error < 0) {
> +		pr_err("Proximity GPIO input configuration failed\n");
> +		goto fail1;
> +	}
> +
> +	error = gpio_request(OMAP4_SFH7741_ENABLE_GPIO, "sfh7741");
> +	if (error < 0) {
> +		pr_err("failed to request GPIO %d, error %d\n",
> +			OMAP4_SFH7741_ENABLE_GPIO, error);
> +		goto fail1;
> +	}
> +
> +	error = gpio_direction_output(OMAP4_SFH7741_ENABLE_GPIO , 1);
> +	if (error < 0) {
> +		pr_err("%s: GPIO configuration failed: GPIO %d,\
> +			error %d\n",__func__, OMAP4_SFH7741_ENABLE_GPIO, error);
> +		goto fail3;
> +	}
> +	return;
> +
> +fail3:
> +	gpio_free(OMAP4_SFH7741_ENABLE_GPIO);
> +fail1:
> +	gpio_free(OMAP4_SFH7741_SENSOR_OUTPUT_GPIO);
> +}

a) mux handling?
b) if init failed, still register the prox device? it wont function right?

>  static void __init omap_4430sdp_init(void)
>  {
>  	platform_add_devices(sdp4430_devices, ARRAY_SIZE(sdp4430_devices));
> @@ -120,6 +190,7 @@ static void __init omap_4430sdp_init(void)
>  	/* FIXME: allow multi-omap to boot until musb is updated for omap4 */
>  	if (!cpu_is_omap44xx())
>  		usb_musb_init(&musb_board_data);
> +	omap_sfh7741prox_init();
>  }
>  
>  static void __init omap_4430sdp_map_io(void)


-- 
Regards,
Nishanth Menon