[PATCH 3/4 v2] libertas: implement function init/shutdown commands for SD8688
bzhao at marvell.com
Thu May 28 14:03:40 EDT 2009
> -----Original Message-----
> From: Marcel Holtmann [mailto:marcel at holtmann.org]
> Sent: Thursday, May 28, 2009 12:21 AM
> To: Bing Zhao
> Cc: libertas-dev at lists.infradead.org; linux-wireless at vger.kernel.org
> Subject: Re: [PATCH 3/4 v2] libertas: implement function init/shutdown commands for SD8688
> Hi Bing,
> > SD8688 is a WLAN/Bluetooth combo chip and both functions are supported
> > in a single firmware image. FUNC_INIT and FUNC_SHUTDOWN commands are
> > implemented to utilize the multiple function feature.
> > When SD8688 card is inserted, the firmware image should be downloaded
> > only once through either WLAN function (Libertas driver) or Bluetooth
> > function (Bluetooth driver).
> > This patch adds function init/shutdown for SD8688 WLAN function only.
> > Signed-off-by: Bing Zhao <bzhao at marvell.com>
> > ---
> > drivers/net/wireless/libertas/host.h | 2 +
> > drivers/net/wireless/libertas/if_sdio.c | 43 +++++++++++++++++++++++++++++-
> > 2 files changed, 43 insertions(+), 2 deletions(-)
> > diff --git a/drivers/net/wireless/libertas/host.h b/drivers/net/wireless/libertas/host.h
> > index 8ff8ac9..fe8f0cb 100644
> > --- a/drivers/net/wireless/libertas/host.h
> > +++ b/drivers/net/wireless/libertas/host.h
> > @@ -86,6 +86,8 @@
> > #define CMD_MESH_CONFIG_OLD 0x00a3
> > #define CMD_MESH_CONFIG 0x00ac
> > #define CMD_SET_BOOT2_VER 0x00a5
> > +#define CMD_FUNC_INIT 0x00a9
> > +#define CMD_FUNC_SHUTDOWN 0x00aa
> > #define CMD_802_11_BEACON_CTRL 0x00b0
> > /* For the IEEE Power Save */
> > diff --git a/drivers/net/wireless/libertas/if_sdio.c b/drivers/net/wireless/libertas/if_sdio.c
> > index e998c12..84fef6b 100644
> > --- a/drivers/net/wireless/libertas/if_sdio.c
> > +++ b/drivers/net/wireless/libertas/if_sdio.c
> > @@ -39,8 +39,12 @@
> > #include "decl.h"
> > #include "defs.h"
> > #include "dev.h"
> > +#include "cmd.h"
> > #include "if_sdio.h"
> > +/* set this flag in if_sdio_exit_module() if user removes this module */
> > +static u8 user_rmmod;
> > +
> what is this suppose to be doing? There is no description in the commit
> messages or the code. And it looks pretty hackish to me.
I'm using this flag as the indication of module removal.
I have to distinguish these scenarios and handle them differently:
(1) user unplugs the card: As the card is unplugged, there is no way (no need) to send SHUTDOWN command.
(2) user removes the libertas_sdio module manually: Since the card is still in the slot, SHUTDOWN command will be sent to firmware.
When user rmmod the module, if_sdio_exit_module() is called and this flag "user_rmmod" is set to 1. When if_sdio_remove() is called this flag will be used to determine whether the SHUTDOWN command should be sent or not.
I hesitated to use this global variable in such a weird way. But I couldn't think of a better solution.
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