1 files changed, 61 insertions, 3 deletions

diff --git a/drivers/net/wireless/microchip/wilc1000/spi.c b/drivers/net/wireless/microchip/wilc1000/spi.c
index e0871b89917d..2c2ed4b09efd 100644
--- a/drivers/net/wireless/microchip/wilc1000/spi.c
+++ b/drivers/net/wireless/microchip/wilc1000/spi.c
@@ -8,6 +8,7 @@
 #include <linux/spi/spi.h>
 #include <linux/crc7.h>
 #include <linux/crc-itu-t.h>
+#include <linux/gpio/consumer.h>
 
 #include "netdev.h"
 #include "cfg80211.h"
@@ -45,6 +46,10 @@ struct wilc_spi {
 	bool probing_crc;	/* true if we're probing chip's CRC config */
 	bool crc7_enabled;	/* true if crc7 is currently enabled */
 	bool crc16_enabled;	/* true if crc16 is currently enabled */
+	struct wilc_gpios {
+		struct gpio_desc *enable;	/* ENABLE GPIO or NULL */
+		struct gpio_desc *reset;	/* RESET GPIO or NULL */
+	} gpios;
 };
 
 static const struct wilc_hif_func wilc_hif_spi;
@@ -152,6 +157,50 @@ struct wilc_spi_special_cmd_rsp {
 	u8 status;
 } __packed;
 
+static int wilc_parse_gpios(struct wilc *wilc)
+{
+	struct spi_device *spi = to_spi_device(wilc->dev);
+	struct wilc_spi *spi_priv = wilc->bus_data;
+	struct wilc_gpios *gpios = &spi_priv->gpios;
+
+	/* get ENABLE pin and deassert it (if it is defined): */
+	gpios->enable = devm_gpiod_get_optional(&spi->dev,
+						"enable", GPIOD_OUT_LOW);
+	/* get RESET pin and assert it (if it is defined): */
+	if (gpios->enable) {
+		/* if enable pin exists, reset must exist as well */
+		gpios->reset = devm_gpiod_get(&spi->dev,
+					      "reset", GPIOD_OUT_HIGH);
+		if (IS_ERR(gpios->reset)) {
+			dev_err(&spi->dev, "missing reset gpio.\n");
+			return PTR_ERR(gpios->reset);
+		}
+	} else {
+		gpios->reset = devm_gpiod_get_optional(&spi->dev,
+						       "reset", GPIOD_OUT_HIGH);
+	}
+	return 0;
+}
+
+static void wilc_wlan_power(struct wilc *wilc, bool on)
+{
+	struct wilc_spi *spi_priv = wilc->bus_data;
+	struct wilc_gpios *gpios = &spi_priv->gpios;
+
+	if (on) {
+		/* assert ENABLE: */
+		gpiod_set_value(gpios->enable, 1);
+		mdelay(5);
+		/* deassert RESET: */
+		gpiod_set_value(gpios->reset, 0);
+	} else {
+		/* assert RESET: */
+		gpiod_set_value(gpios->reset, 1);
+		/* deassert ENABLE: */
+		gpiod_set_value(gpios->enable, 0);
+	}
+}
+
 static int wilc_bus_probe(struct spi_device *spi)
 {
 	int ret;
@@ -171,6 +220,10 @@ static int wilc_bus_probe(struct spi_device *spi)
 	wilc->bus_data = spi_priv;
 	wilc->dev_irq_num = spi->irq;
 
+	ret = wilc_parse_gpios(wilc);
+	if (ret < 0)
+		goto netdev_cleanup;
+
 	wilc->rtc_clk = devm_clk_get_optional(&spi->dev, "rtc");
 	if (IS_ERR(wilc->rtc_clk)) {
 		ret = PTR_ERR(wilc->rtc_clk);
@@ -190,9 +243,11 @@ free:
 static int wilc_bus_remove(struct spi_device *spi)
 {
 	struct wilc *wilc = spi_get_drvdata(spi);
+	struct wilc_spi *spi_priv = wilc->bus_data;
 
 	clk_disable_unprepare(wilc->rtc_clk);
 	wilc_netdev_cleanup(wilc);
+	kfree(spi_priv);
 
 	return 0;
 }
@@ -981,9 +1036,10 @@ static int wilc_spi_reset(struct wilc *wilc)
 
 static int wilc_spi_deinit(struct wilc *wilc)
 {
-	/*
-	 * TODO:
-	 */
+	struct wilc_spi *spi_priv = wilc->bus_data;
+
+	spi_priv->isinit = false;
+	wilc_wlan_power(wilc, false);
 	return 0;
 }
 
@@ -1004,6 +1060,8 @@ static int wilc_spi_init(struct wilc *wilc, bool resume)
 		dev_err(&spi->dev, "Fail cmd read chip id...\n");
 	}
 
+	wilc_wlan_power(wilc, true);
+
 	/*
 	 * configure protocol
 	 */