[arm/tegra] provide wifi power/carddetect abstraction

When user switches on wifi, wifi driver need to poweron wifi card and
ask sdhci stack to enumerate the card. Sdhci stack does not provide any
interface to achieve this. Major wifi vendors depend on platform to
provide wifi poweron/reset/carddetect abstraction function.

Bug ID 739374

Change-Id: I988393352ff6cb54be3d70a59c94f67eedff06fb
Reviewed-on: http://git-master/r/7097
Reviewed-by: Rakesh Kumar <krakesh@nvidia.com>
Tested-by: Rakesh Kumar <krakesh@nvidia.com>
Reviewed-by: Bharat Nihalani <bnihalani@nvidia.com>

1 files changed, 25 insertions, 8 deletions

diff --git a/drivers/mmc/host/sdhci-tegra.c b/drivers/mmc/host/sdhci-tegra.c
index 6061d713e7ca..8f9510c7dea7 100755
--- a/drivers/mmc/host/sdhci-tegra.c
+++ b/drivers/mmc/host/sdhci-tegra.c
@@ -74,7 +74,7 @@ static irqreturn_t card_detect_isr(int irq, void *dev_id)
 	struct tegra_sdhci *host = sdhci_priv(sdhost);
 
 	host->card_present =
-		(gpio_get_value(host->gpio_cd)==host->gpio_polarity_cd);
+		(gpio_get_value(host->gpio_cd) == host->gpio_polarity_cd);
 	smp_wmb();
 	sdhci_card_detect_callback(sdhost);
 
@@ -88,12 +88,24 @@ static bool tegra_sdhci_card_detect(struct sdhci_host *sdhost)
 	return host->card_present;
 }
 
+static void tegra_sdhci_status_notify_cb(int card_present, void *dev_id)
+{
+	struct sdhci_host *sdhost = dev_id;
+	struct tegra_sdhci *host = sdhci_priv(sdhost);
+
+	dev_dbg(&host->pdev->dev, "%s: card_present %d\n",
+		mmc_hostname(sdhost->mmc), card_present);
+
+	host->card_present = card_present;
+	sdhci_card_detect_callback(sdhost);
+}
+
 static int tegra_sdhci_get_ro(struct sdhci_host *sdhost)
 {
 	struct tegra_sdhci *host = sdhci_priv(sdhost);
 
 	BUG_ON(host->gpio_wp == -1);
-	return (gpio_get_value(host->gpio_wp)==host->gpio_polarity_wp);
+	return (gpio_get_value(host->gpio_wp) == host->gpio_polarity_wp);
 }
 
 static void tegra_sdhci_set_clock(struct sdhci_host *sdhost,
@@ -236,7 +248,7 @@ int __init tegra_sdhci_probe(struct platform_device *pdev)
 			host->gpio_cd = -1;
 			host->irq_cd = -1;
 			goto skip_gpio_cd;
-		} 
+		}
 		ret = gpio_direction_input(host->gpio_cd);
 		if (ret < 0) {
 			dev_err(&pdev->dev, "failed to configure GPIO\n");
@@ -255,7 +267,8 @@ int __init tegra_sdhci_probe(struct platform_device *pdev)
 			goto skip_gpio_cd;
 		}
 		host->card_present =
-			(gpio_get_value(host->gpio_cd)==host->gpio_polarity_cd);
+			(gpio_get_value(host->gpio_cd) ==
+				host->gpio_polarity_cd);
 	}
 skip_gpio_cd:
 	ret = 0;
@@ -309,6 +322,10 @@ skip_gpio_wp:
 	if (!plat->is_removable)
 		host->card_present = true;
 
+	if (plat->register_status_notify)
+		plat->register_status_notify(tegra_sdhci_status_notify_cb,
+			sdhost);
+
 	sdhost->data_width = plat->bus_width;
 	sdhost->dma_mask = DMA_BIT_MASK(32);
 	ret = sdhci_add_host(sdhost);
@@ -400,7 +417,7 @@ static void tegra_sdhci_restore_interrupts(struct sdhci_host *sdhost)
 	sdhci_writel(sdhost, ierr, SDHCI_INT_ENABLE);
 	sdhci_writel(sdhost, ierr, SDHCI_SIGNAL_ENABLE);
 
-	if ( (host->sdhci_ints & SDHCI_INT_CARD_INT) &&
+	if ((host->sdhci_ints & SDHCI_INT_CARD_INT) &&
 		(sdhost->quirks & SDHCI_QUIRK_ENABLE_INTERRUPT_AT_BLOCK_GAP)) {
 		u8 gap_ctrl = sdhci_readb(sdhost, SDHCI_BLOCK_GAP_CONTROL);
 		gap_ctrl |= 0x8;
@@ -493,7 +510,7 @@ static int tegra_sdhci_resume(struct device *dev)
 		host->clk_enable = true;
 	}
 
-	if(host->card_always_on && is_card_sdio(sdhost->mmc->card)) {
+	if (host->card_always_on && is_card_sdio(sdhost->mmc->card)) {
 		int ret = 0;
 
 		/* soft reset SD host controller and enable interrupts */
@@ -508,7 +525,7 @@ static int tegra_sdhci_resume(struct device *dev)
 		return 0;
 	}
 
-	if(host->hOdmSdio)
+	if (host->hOdmSdio)
 		NvOdmSdioResume(host->hOdmSdio);
 
 	return sdhci_resume_host(sdhost);
@@ -517,7 +534,7 @@ static struct dev_pm_ops tegra_sdhci_pm = {
 	.suspend = tegra_sdhci_suspend,
 	.resume = tegra_sdhci_resume,
 };
-#define tegra_sdhci_pm_ops &tegra_sdhci_pm
+#define tegra_sdhci_pm_ops (&tegra_sdhci_pm)
 #else
 #define tegra_sdhci_pm_ops NULL
 #endif