[PATCH 1/1] w1: add dual search support

[Sascha Hauer]

On Mon, Jan 28, 2013 at 11:23:00PM +0100, Jean-Christophe PLAGNIOL-VILLARD wrote:
> Some 1-wire device need to be search twice to be detected
> 
> Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj at jcrosoft.com>

Applied, thanks

Sascha

> ---
>  drivers/w1/Kconfig |    5 +++++
>  drivers/w1/w1.c    |   27 ++++++++++++++++++++++++++-
>  drivers/w1/w1.h    |    2 ++
>  3 files changed, 33 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/w1/Kconfig b/drivers/w1/Kconfig
> index ab34997..dbc1e3c 100644
> --- a/drivers/w1/Kconfig
> +++ b/drivers/w1/Kconfig
> @@ -11,4 +11,9 @@ if W1
>  source drivers/w1/masters/Kconfig
>  source drivers/w1/slaves/Kconfig
>  
> +config W1_DUAL_SEARCH
> +	bool "dual search"
> +	---help---
> +	  Some device need to be searched twice to be detected
> +
>  endif # W1
> diff --git a/drivers/w1/w1.c b/drivers/w1/w1.c
> index d2f94c9..eb6bec8 100644
> --- a/drivers/w1/w1.c
> +++ b/drivers/w1/w1.c
> @@ -402,6 +402,21 @@ struct bus_type w1_bustype= {
>  	.remove = w1_bus_remove,
>  };
>  
> +static bool w1_is_registered(struct w1_bus *bus, u64 rn)
> +{
> +	struct device_d *dev = NULL;
> +	struct w1_device *w1_dev;
> +
> +	bus_for_each_device(&w1_bustype, dev) {
> +		w1_dev = to_w1_device(dev);
> +
> +		if (w1_dev->bus == bus && w1_dev->reg_num == rn)
> +			return true;
> +	}
> +
> +	return false;
> +}
> +
>  static int w1_device_register(struct w1_bus *bus, struct w1_device *dev)
>  {
>  	char str[18];
> @@ -442,9 +457,15 @@ int w1_driver_register(struct w1_driver *drv)
>  
>  void w1_found(struct w1_bus *bus, u64 rn)
>  {
> -	struct w1_device *dev = xzalloc(sizeof(*dev));
> +	struct w1_device *dev;
>  	u64 tmp = be64_to_cpu(rn);
>  
> +	if (IS_ENABLED(CONFIG_W1_DUAL_SEARCH)
> +	 && bus->is_searched && w1_is_registered(bus, rn))
> +		return;
> +
> +	dev = xzalloc(sizeof(*dev));
> +
>  	dev->reg_num = rn;
>  	dev->fid = tmp >> 56;
>  	dev->id = (tmp >> 8) & 0xffffffffffff;
> @@ -605,7 +626,11 @@ int w1_bus_register(struct w1_bus *bus)
>  	if (ret)
>  		return ret;
>  
> +	bus->is_searched = false;
>  	w1_search(bus, W1_SEARCH);
> +	bus->is_searched = true;
> +	if (IS_ENABLED(CONFIG_W1_DUAL_SEARCH))
> +		w1_search(bus, W1_SEARCH);
>  
>  	return 0;
>  }
> diff --git a/drivers/w1/w1.h b/drivers/w1/w1.h
> index 1373f69..b92d8cd 100644
> --- a/drivers/w1/w1.h
> +++ b/drivers/w1/w1.h
> @@ -133,6 +133,8 @@ struct w1_bus
>  
>  	int		max_slave_count, slave_count;
>  
> +	bool		is_searched;
> +
>  	void		*data;
>  	struct list_head list;
>  };
> -- 
> 1.7.10.4
> 
> 
> _______________________________________________
> barebox mailing list
> barebox at lists.infradead.org
> http://lists.infradead.org/mailman/listinfo/barebox
> 

-- 
Pengutronix e.K.                           |                             |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |
Peiner Str. 6-8, 31137 Hildesheim, Germany | Phone: +49-5121-206917-0    |
Amtsgericht Hildesheim, HRA 2686           | Fax:   +49-5121-206917-5555 |