On Wed, Jun 29, 2011 at 11:43 AM, zhangfei gao <zhangfei.gao@xxxxxxxxx> wrote: > However still not fully understand how to call ->remove to power off > wlan, using suspend system looks to me is only test method, which > counting on bus_ops->suspend returns -ENOSYS. Please take a look at mac80211 and wl12xx. We're not using ->remove, ->probe or -ENOSYS at all. When the user brings up the interface, we then power up the chip and download the firmware. Likewise, when the interface is brought down, we just power off the chip. > 2. Explicitly call mmc_detect_change, > when power off, mmc_rescan -> bus_ops->detect(host) -> mmc_select_card > fail -> mmc_sdio_remove; > when power on, mmc_rescan -> mmc_attach_sdio->wlan probe. This is awkward. Basically what you're saying is that your driver can only power on the chip when it is probed. IMHO you need to refactor your driver, so it will power on/off the device according to interface status changes, without requiring the system to remove and re-detect the device. -- To unsubscribe from this list: send the line "unsubscribe linux-mmc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
