nfs: disintegrate UAPI for nfs

This is to complete part of the Userspace API (UAPI) disintegration for which
the preparatory patches were pulled recently.  After these patches, userspace
headers will be segregated into:

        include/uapi/linux/.../foo.h

for the userspace interface stuff, and:

        include/linux/.../foo.h

for the strictly kernel internal stuff.

Signed-off-by: J. Bruce Fields <bfields@redhat.com>

1 files changed, 119 insertions, 12 deletions

diff --git a/drivers/spi/spi-gpio.c b/drivers/spi/spi-gpio.c
index 0b56cfc71fa..a2b50c516b3 100644
--- a/drivers/spi/spi-gpio.c
+++ b/drivers/spi/spi-gpio.c
@@ -22,6 +22,8 @@
 #include <linux/init.h>
 #include <linux/platform_device.h>
 #include <linux/gpio.h>
+#include <linux/of_device.h>
+#include <linux/of_gpio.h>
 
 #include <linux/spi/spi.h>
 #include <linux/spi/spi_bitbang.h>
@@ -46,6 +48,7 @@ struct spi_gpio {
 	struct spi_bitbang		bitbang;
 	struct spi_gpio_platform_data	pdata;
 	struct platform_device		*pdev;
+	int				cs_gpios[0];
 };
 
 /*----------------------------------------------------------------------*/
@@ -89,15 +92,21 @@ struct spi_gpio {
 
 /*----------------------------------------------------------------------*/
 
-static inline const struct spi_gpio_platform_data * __pure
-spi_to_pdata(const struct spi_device *spi)
+static inline struct spi_gpio * __pure
+spi_to_spi_gpio(const struct spi_device *spi)
 {
 	const struct spi_bitbang	*bang;
-	const struct spi_gpio		*spi_gpio;
+	struct spi_gpio			*spi_gpio;
 
 	bang = spi_master_get_devdata(spi->master);
 	spi_gpio = container_of(bang, struct spi_gpio, bitbang);
-	return &spi_gpio->pdata;
+	return spi_gpio;
+}
+
+static inline struct spi_gpio_platform_data * __pure
+spi_to_pdata(const struct spi_device *spi)
+{
+	return &spi_to_spi_gpio(spi)->pdata;
 }
 
 /* this is #defined to avoid unused-variable warnings when inlining */
@@ -210,7 +219,8 @@ static u32 spi_gpio_spec_txrx_word_mode3(struct spi_device *spi,
 
 static void spi_gpio_chipselect(struct spi_device *spi, int is_active)
 {
-	unsigned long cs = (unsigned long) spi->controller_data;
+	struct spi_gpio *spi_gpio = spi_to_spi_gpio(spi);
+	unsigned int cs = spi_gpio->cs_gpios[spi->chip_select];
 
 	/* set initial clock polarity */
 	if (is_active)
@@ -224,12 +234,27 @@ static void spi_gpio_chipselect(struct spi_device *spi, int is_active)
 
 static int spi_gpio_setup(struct spi_device *spi)
 {
-	unsigned long	cs = (unsigned long) spi->controller_data;
-	int		status = 0;
+	unsigned int		cs;
+	int			status = 0;
+	struct spi_gpio		*spi_gpio = spi_to_spi_gpio(spi);
+	struct device_node	*np = spi->master->dev.of_node;
 
 	if (spi->bits_per_word > 32)
 		return -EINVAL;
 
+	if (np) {
+		/*
+		 * In DT environments, the CS GPIOs have already been
+		 * initialized from the "cs-gpios" property of the node.
+		 */
+		cs = spi_gpio->cs_gpios[spi->chip_select];
+	} else {
+		/*
+		 * ... otherwise, take it from spi->controller_data
+		 */
+		cs = (unsigned int) spi->controller_data;
+	}
+
 	if (!spi->controller_state) {
 		if (cs != SPI_GPIO_NO_CHIPSELECT) {
 			status = gpio_request(cs, dev_name(&spi->dev));
@@ -239,8 +264,12 @@ static int spi_gpio_setup(struct spi_device *spi)
 					!(spi->mode & SPI_CS_HIGH));
 		}
 	}
-	if (!status)
+	if (!status) {
 		status = spi_bitbang_setup(spi);
+		/* in case it was initialized from static board data */
+		spi_gpio->cs_gpios[spi->chip_select] = cs;
+	}
+
 	if (status) {
 		if (!spi->controller_state && cs != SPI_GPIO_NO_CHIPSELECT)
 			gpio_free(cs);
@@ -250,7 +279,8 @@ static int spi_gpio_setup(struct spi_device *spi)
 
 static void spi_gpio_cleanup(struct spi_device *spi)
 {
-	unsigned long	cs = (unsigned long) spi->controller_data;
+	struct spi_gpio *spi_gpio = spi_to_spi_gpio(spi);
+	unsigned int cs = spi_gpio->cs_gpios[spi->chip_select];
 
 	if (cs != SPI_GPIO_NO_CHIPSELECT)
 		gpio_free(cs);
@@ -313,6 +343,55 @@ done:
 	return value;
 }
 
+#ifdef CONFIG_OF
+static struct of_device_id spi_gpio_dt_ids[] = {
+	{ .compatible = "spi-gpio" },
+	{}
+};
+MODULE_DEVICE_TABLE(of, spi_gpio_dt_ids);
+
+static int spi_gpio_probe_dt(struct platform_device *pdev)
+{
+	int ret;
+	u32 tmp;
+	struct spi_gpio_platform_data	*pdata;
+	struct device_node *np = pdev->dev.of_node;
+	const struct of_device_id *of_id =
+			of_match_device(spi_gpio_dt_ids, &pdev->dev);
+
+	if (!of_id)
+		return 0;
+
+	pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
+	if (!pdata)
+		return -ENOMEM;
+
+	pdata->sck = of_get_named_gpio(np, "gpio-sck", 0);
+	pdata->miso = of_get_named_gpio(np, "gpio-miso", 0);
+	pdata->mosi = of_get_named_gpio(np, "gpio-mosi", 0);
+
+	ret = of_property_read_u32(np, "num-chipselects", &tmp);
+	if (ret < 0) {
+		dev_err(&pdev->dev, "num-chipselects property not found\n");
+		goto error_free;
+	}
+
+	pdata->num_chipselect = tmp;
+	pdev->dev.platform_data = pdata;
+
+	return 1;
+
+error_free:
+	devm_kfree(&pdev->dev, pdata);
+	return ret;
+}
+#else
+static inline int spi_gpio_probe_dt(struct platform_device *pdev)
+{
+	return 0;
+}
+#endif
+
 static int __devinit spi_gpio_probe(struct platform_device *pdev)
 {
 	int				status;
@@ -320,6 +399,13 @@ static int __devinit spi_gpio_probe(struct platform_device *pdev)
 	struct spi_gpio			*spi_gpio;
 	struct spi_gpio_platform_data	*pdata;
 	u16 master_flags = 0;
+	bool use_of = 0;
+
+	status = spi_gpio_probe_dt(pdev);
+	if (status < 0)
+		return status;
+	if (status > 0)
+		use_of = 1;
 
 	pdata = pdev->dev.platform_data;
 #ifdef GENERIC_BITBANG
@@ -331,7 +417,8 @@ static int __devinit spi_gpio_probe(struct platform_device *pdev)
 	if (status < 0)
 		return status;
 
-	master = spi_alloc_master(&pdev->dev, sizeof *spi_gpio);
+	master = spi_alloc_master(&pdev->dev, sizeof(*spi_gpio) +
+					(sizeof(int) * SPI_N_CHIPSEL));
 	if (!master) {
 		status = -ENOMEM;
 		goto gpio_free;
@@ -348,6 +435,23 @@ static int __devinit spi_gpio_probe(struct platform_device *pdev)
 	master->num_chipselect = SPI_N_CHIPSEL;
 	master->setup = spi_gpio_setup;
 	master->cleanup = spi_gpio_cleanup;
+#ifdef CONFIG_OF
+	master->dev.of_node = pdev->dev.of_node;
+
+	if (use_of) {
+		int i;
+		struct device_node *np = pdev->dev.of_node;
+
+		/*
+		 * In DT environments, take the CS GPIO from the "cs-gpios"
+		 * property of the node.
+		 */
+
+		for (i = 0; i < SPI_N_CHIPSEL; i++)
+			spi_gpio->cs_gpios[i] =
+				of_get_named_gpio(np, "cs-gpios", i);
+	}
+#endif
 
 	spi_gpio->bitbang.master = spi_master_get(master);
 	spi_gpio->bitbang.chipselect = spi_gpio_chipselect;
@@ -408,8 +512,11 @@ static int __devexit spi_gpio_remove(struct platform_device *pdev)
 MODULE_ALIAS("platform:" DRIVER_NAME);
 
 static struct platform_driver spi_gpio_driver = {
-	.driver.name	= DRIVER_NAME,
-	.driver.owner	= THIS_MODULE,
+	.driver = {
+		.name	= DRIVER_NAME,
+		.owner	= THIS_MODULE,
+		.of_match_table = of_match_ptr(spi_gpio_dt_ids),
+	},
 	.probe		= spi_gpio_probe,
 	.remove		= __devexit_p(spi_gpio_remove),
 };