openwrt-owl/target/linux/ar71xx/patches-3.2/205-spi-ath79-introduce-ath79_spi_-en-dis-able-helpers.patch

From 4518ae06e5fc953abfd9c2b66c6155fc2b2696ce Mon Sep 17 00:00:00 2001
From: Gabor Juhos <juhosg@openwrt.org>
Date: Mon, 9 Jan 2012 15:00:46 +0100
Subject: [PATCH 5/7] spi/ath79: introduce ath79_spi_{en,dis}able helpers

---
 drivers/spi/spi-ath79.c |   41 +++++++++++++++++++++++++----------------
 1 files changed, 25 insertions(+), 16 deletions(-)

--- a/drivers/spi/spi-ath79.c
+++ b/drivers/spi/spi-ath79.c
@@ -89,16 +89,8 @@ static void ath79_spi_chipselect(struct 
 
 }
 
-static int ath79_spi_setup_cs(struct spi_device *spi)
+static void ath79_spi_enable(struct ath79_spi *sp)
 {
-	struct ath79_spi *sp = ath79_spidev_to_sp(spi);
-	struct ath79_spi_controller_data *cdata;
-	int status;
-
-	cdata = spi->controller_data;
-	if (spi->chip_select && !cdata)
-		return -EINVAL;
-
 	/* enable GPIO mode */
 	ath79_spi_wr(sp, AR71XX_SPI_REG_FS, AR71XX_SPI_FS_GPIO);
 
@@ -108,6 +100,25 @@ static int ath79_spi_setup_cs(struct spi
 
 	/* TODO: setup speed? */
 	ath79_spi_wr(sp, AR71XX_SPI_REG_CTRL, 0x43);
+}
+
+static void ath79_spi_disable(struct ath79_spi *sp)
+{
+	/* restore CTRL register */
+	ath79_spi_wr(sp, AR71XX_SPI_REG_CTRL, sp->reg_ctrl);
+	/* disable GPIO mode */
+	ath79_spi_wr(sp, AR71XX_SPI_REG_FS, 0);
+}
+
+static int ath79_spi_setup_cs(struct spi_device *spi)
+{
+	struct ath79_spi *sp = ath79_spidev_to_sp(spi);
+	struct ath79_spi_controller_data *cdata;
+	int status;
+
+	cdata = spi->controller_data;
+	if (spi->chip_select && !cdata)
+		return -EINVAL;
 
 	status = 0;
 	if (spi->chip_select) {
@@ -134,11 +145,6 @@ static void ath79_spi_cleanup_cs(struct 
 		struct ath79_spi_controller_data *cdata = spi->controller_data;
 		gpio_free(cdata->gpio);
 	}
-
-	/* restore CTRL register */
-	ath79_spi_wr(sp, AR71XX_SPI_REG_CTRL, sp->reg_ctrl);
-	/* disable GPIO mode */
-	ath79_spi_wr(sp, AR71XX_SPI_REG_FS, 0);
 }
 
 static int ath79_spi_setup(struct spi_device *spi)
@@ -242,13 +248,15 @@ static __devinit int ath79_spi_probe(str
 		goto err_put_master;
 	}
 
+	ath79_spi_enable(sp);
 	ret = spi_bitbang_start(&sp->bitbang);
 	if (ret)
-		goto err_unmap;
+		goto err_disable;
 
 	return 0;
 
-err_unmap:
+err_disable:
+	ath79_spi_disable(sp);
 	iounmap(sp->base);
 err_put_master:
 	platform_set_drvdata(pdev, NULL);
@@ -262,6 +270,7 @@ static __devexit int ath79_spi_remove(st
 	struct ath79_spi *sp = platform_get_drvdata(pdev);
 
 	spi_bitbang_stop(&sp->bitbang);
+	ath79_spi_disable(sp);
 	iounmap(sp->base);
 	platform_set_drvdata(pdev, NULL);
 	spi_master_put(sp->bitbang.master);