[PATCH] libertas: if_spi: add ability to call board specific setup/teardown methods

[Dan Williams]

On Tue, 2009-02-03 at 09:04 +0200, Mike Rapoport wrote:
> In certain cases it is required to perform board specific actions
> before activating libertas G-SPI interface. These actions may include
> power up of the chip, GPIOs setup, proper pin-strapping and SPI
> controller config.
> This patch adds ability to call board specific setup/teardown methods
> 
> 
> Signed-off-by: Mike Rapoport <mike at compulab.co.il>

Andrey, does this look OK to you?  Seems fine to me, though what's the
lifetime of the platform data 'pdata' in the probe function?  Is that
guaranteed to be valid for the entire lifetime of the libertas SPI
device?

Dan

> ---
>  drivers/net/wireless/libertas/if_spi.c |   15 +++++++++++++++
>  include/linux/spi/libertas_spi.h       |    7 +++++++
>  2 files changed, 22 insertions(+), 0 deletions(-)
> 
> diff --git a/drivers/net/wireless/libertas/if_spi.c b/drivers/net/wireless/libertas/if_spi.c
> index 7c02ea3..07311e7 100644
> --- a/drivers/net/wireless/libertas/if_spi.c
> +++ b/drivers/net/wireless/libertas/if_spi.c
> @@ -42,6 +42,7 @@ struct if_spi_packet {
>  struct if_spi_card {
>  	struct spi_device		*spi;
>  	struct lbs_private		*priv;
> +	struct libertas_spi_platform_data *pdata;
> 
>  	char				helper_fw_name[FIRMWARE_NAME_MAX];
>  	char				main_fw_name[FIRMWARE_NAME_MAX];
> @@ -1022,6 +1023,17 @@ static int __devinit if_spi_probe(struct spi_device *spi)
> 
>  	lbs_deb_enter(LBS_DEB_SPI);
> 
> +	if (!pdata) {
> +		err = -EINVAL;
> +		goto out;
> +	}
> +
> +	if (pdata->setup) {
> +		err = pdata->setup(spi);
> +		if (err)
> +			goto out;
> +	}
> +
>  	/* Allocate card structure to represent this specific device */
>  	card = kzalloc(sizeof(struct if_spi_card), GFP_KERNEL);
>  	if (!card) {
> @@ -1029,6 +1041,7 @@ static int __devinit if_spi_probe(struct spi_device *spi)
>  		goto out;
>  	}
>  	spi_set_drvdata(spi, card);
> +	card->pdata = pdata;
>  	card->spi = spi;
>  	card->gpio_cs = pdata->gpio_cs;
>  	card->prev_xfer_time = jiffies;
> @@ -1158,6 +1171,8 @@ static int __devexit libertas_spi_remove(struct spi_device *spi)
>  	if_spi_terminate_spi_thread(card);
>  	lbs_remove_card(priv); /* will call free_netdev */
>  	gpio_free(card->gpio_cs);
> +	if (card->pdata->teardown)
> +		card->pdata->teardown(spi);
>  	free_if_spi_card(card);
>  	lbs_deb_leave(LBS_DEB_SPI);
>  	return 0;
> diff --git a/include/linux/spi/libertas_spi.h b/include/linux/spi/libertas_spi.h
> index ada71b4..79506f5 100644
> --- a/include/linux/spi/libertas_spi.h
> +++ b/include/linux/spi/libertas_spi.h
> @@ -10,6 +10,9 @@
>   */
>  #ifndef _LIBERTAS_SPI_H_
>  #define _LIBERTAS_SPI_H_
> +
> +struct spi_device;
> +
>  struct libertas_spi_platform_data {
>  	/* There are two ways to read data from the WLAN module's SPI
>  	 * interface. Setting 0 or 1 here controls which one is used.
> @@ -21,5 +24,9 @@ struct libertas_spi_platform_data {
> 
>  	/* GPIO number to use as chip select */
>  	u16 gpio_cs;
> +
> +	/* Board specific setup/teardown */
> +	int (*setup)(struct spi_device *spi);
> +	int (*teardown)(struct spi_device *spi);
>  };
>  #endif
> -- 
> 1.5.6.4
> 
>