wlcore/wl12xx: spi: add power operation function

The power function uses a consumer regulator access to update the WiFi
enable GPIO value.

Signed-off-by: Uri Mashiach <uri.mashiach@compulab.co.il>
Tested-By: Sebastian Reichel <sre@kernel.org>
Reviewed-by: Grygorii Strashko <grygorii.strashko@ti.com>
Acked-by: Igor Grinberg <grinberg@compulab.co.il>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

diff --git a/drivers/net/wireless/ti/wlcore/spi.c b/drivers/net/wireless/ti/wlcore/spi.c
index 44f059f7f34e9473ce4e4b33648a3af9b2e44f1e..dec151247d0d100a48698e65ac210531ee993a66 100644 (file)
--- a/drivers/net/wireless/ti/wlcore/spi.c
+++ b/drivers/net/wireless/ti/wlcore/spi.c
@@ -30,6 +30,7 @@
 #include <linux/spi/spi.h>
 #include <linux/wl12xx.h>
 #include <linux/platform_device.h>
+#include <linux/regulator/consumer.h>
 
 #include "wlcore.h"
 #include "wl12xx_80211.h"
@@ -81,6 +82,7 @@
 struct wl12xx_spi_glue {
        struct device *dev;
        struct platform_device *core;
+       struct regulator *reg; /* Power regulator */
 };
 
 static void wl12xx_spi_reset(struct device *child)
@@ -318,11 +320,40 @@ static int __must_check wl12xx_spi_raw_write(struct device *child, int addr,
        return 0;
 }
 
+/**
+ * wl12xx_spi_set_power - power on/off the wl12xx unit
+ * @child: wl12xx device handle.
+ * @enable: true/false to power on/off the unit.
+ *
+ * use the WiFi enable regulator to enable/disable the WiFi unit.
+ */
+static int wl12xx_spi_set_power(struct device *child, bool enable)
+{
+       int ret = 0;
+       struct wl12xx_spi_glue *glue = dev_get_drvdata(child->parent);
+
+       WARN_ON(!glue->reg);
+
+       /* Update regulator state */
+       if (enable) {
+               ret = regulator_enable(glue->reg);
+               if (ret)
+                       dev_err(child, "Power enable failure\n");
+       } else {
+               ret =  regulator_disable(glue->reg);
+               if (ret)
+                       dev_err(child, "Power disable failure\n");
+       }
+
+       return ret;
+}
+
 static struct wl1271_if_operations spi_ops = {
        .read           = wl12xx_spi_raw_read,
        .write          = wl12xx_spi_raw_write,
        .reset          = wl12xx_spi_reset,
        .init           = wl12xx_spi_init,
+       .power          = wl12xx_spi_set_power,
        .set_block_size = NULL,
 };
 
@@ -353,6 +384,14 @@ static int wl1271_probe(struct spi_device *spi)
         * comes from the board-peripherals file */
        spi->bits_per_word = 32;
 
+       glue->reg = devm_regulator_get(&spi->dev, "vwlan");
+       if (PTR_ERR(glue->reg) == -EPROBE_DEFER)
+               return -EPROBE_DEFER;
+       if (IS_ERR(glue->reg)) {
+               dev_err(glue->dev, "can't get regulator\n");
+               return PTR_ERR(glue->reg);
+       }
+
        ret = spi_setup(spi);
        if (ret < 0) {
                dev_err(glue->dev, "spi_setup failed\n");