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Update gpiommc to use configfs

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SVN-Revision: 11887
This commit is contained in:
Michael Büsch 2008-07-20 19:34:09 +00:00
parent d7bdc37560
commit 204728376c
6 changed files with 630 additions and 228 deletions
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2
package/mmc_over_gpio/Makefile
View file

@ -16,7 +16,7 @@ include $(INCLUDE_DIR)/package.mk
define KernelPackage/mmc-over-gpio
SUBMENU:=Other modules
DEPENDS:=@GPIO_SUPPORT +kmod-mmc-spi +kmod-spi-gpio
KCONFIG:=CONFIG_GPIOMMC
KCONFIG:=CONFIG_GPIOMMC CONFIG_CONFIGFS_FS=y
TITLE:=MMC/SD card over GPIO support
FILES:=$(LINUX_DIR)/drivers/mmc/host/gpiommc.$(LINUX_KMOD_SUFFIX)
AUTOLOAD:=$(call AutoLoad,93,spi_gpio gpiommc)

47
package/mmc_over_gpio/files/mmc_over_gpio.init
View file

@ -2,20 +2,59 @@
# Copyright (C) 2008 OpenWrt.org
START=90
SYSFS="/sys"
SYSFS_DRIVERDIR="$SYSFS/bus/platform/drivers/gpiommc"
CONFIGFS_DIR="/config/gpiommc"
# add_device(name, DI_pin, DO_pin, CLK_pin, CS_pin, mode)
add_device() {
echo -n "$1" "$2" "$3" "$4" "$5" "$6" > $SYSFS_DRIVERDIR/add
local dir="$CONFIGFS_DIR/$1"
mkdir $dir
[ $? -eq 0 ] || return 1
echo $2 > $dir/gpio_data_in
[ $? -eq 0 ] || return 1
echo $3 > $dir/gpio_data_out
[ $? -eq 0 ] || return 1
echo $4 > $dir/gpio_clock
[ $? -eq 0 ] || return 1
echo $5 > $dir/gpio_chipselect
[ $? -eq 0 ] || return 1
echo $6 > $dir/spi_mode
[ $? -eq 0 ] || return 1
# XXX We have more config options available. Use defaults for now.
echo 1 > $dir/register
[ $? -eq 0 ] || return 1
return 0
}
# remove_device(name)
remove_device() {
echo -n "$1" > $SYSFS_DRIVERDIR/remove
local dir="$CONFIGFS_DIR/$1"
rmdir $dir
}
mount_configfs() {
# FIXME: This should probably be done somewhere else.
mount | grep configfs
if [ $? -eq 0 ]; then
# already mounted
return 0
fi
mkdir -p /config
[ $? -eq 0 ] || return 1
mount configfs -t configfs /config
[ $? -eq 0 ] || return 1
return 0
}
start() {
# Make sure configfs is mounted
mount_configfs
[ $? -eq 0 ] || return 1
#FIXME we should use a config file, but I dunno how that parser works.
add_device "default" 5 4 3 7 0
}

44
target/linux/brcm47xx/patches-2.6.25/710-add-gpio-is-valid.patch Normal file
View file

@ -0,0 +1,44 @@
Add gpio_is_valid() for bcm47xx
Index: linux-2.6.25.10/arch/mips/bcm47xx/gpio.c
===================================================================
--- linux-2.6.25.10.orig/arch/mips/bcm47xx/gpio.c 2008-07-20 20:48:44.000000000 +0200
+++ linux-2.6.25.10/arch/mips/bcm47xx/gpio.c 2008-07-20 20:57:55.000000000 +0200
@@ -77,3 +77,15 @@ int bcm47xx_gpio_direction_output(unsign
}
EXPORT_SYMBOL_GPL(bcm47xx_gpio_direction_output);
+int bcm47xx_gpio_is_valid(int gpio)
+{
+ if (ssb_bcm47xx.chipco.dev) {
+ if (gpio >= 0 && gpio < BCM47XX_CHIPCO_GPIO_LINES)
+ return 1;
+ } else if (ssb_bcm47xx.extif.dev) {
+ if (gpio >= 0 && gpio < BCM47XX_EXTIF_GPIO_LINES)
+ return 1;
+ }
+ return 0;
+}
+EXPORT_SYMBOL_GPL(bcm47xx_gpio_is_valid);
Index: linux-2.6.25.10/include/asm-mips/mach-bcm47xx/gpio.h
===================================================================
--- linux-2.6.25.10.orig/include/asm-mips/mach-bcm47xx/gpio.h 2008-07-20 20:48:44.000000000 +0200
+++ linux-2.6.25.10/include/asm-mips/mach-bcm47xx/gpio.h 2008-07-20 20:49:20.000000000 +0200
@@ -17,6 +17,7 @@ extern int bcm47xx_gpio_get_value(unsign
extern void bcm47xx_gpio_set_value(unsigned gpio, int value);
extern int bcm47xx_gpio_direction_input(unsigned gpio);
extern int bcm47xx_gpio_direction_output(unsigned gpio, int value);
+extern int bcm47xx_gpio_is_valid(int gpio);
static inline int gpio_request(unsigned gpio, const char *label)
{
@@ -52,6 +53,10 @@ static inline int gpio_direction_output(
return bcm47xx_gpio_direction_output(gpio, value);
}
+static inline int gpio_is_valid(int gpio)
+{
+ return bcm47xx_gpio_is_valid(gpio);
+}
/* cansleep wrappers */
#include <asm-generic/gpio.h>

18
target/linux/generic-2.6/patches-2.6.25/920-backport-gpio-is-valid.patch Normal file
View file

@ -0,0 +1,18 @@
Backport gpio_is_valid() for gpiolib from linux-2.6.26
Index: linux-2.6.25.10/include/asm-generic/gpio.h
===================================================================
--- linux-2.6.25.10.orig/include/asm-generic/gpio.h 2008-07-03 05:46:47.000000000 +0200
+++ linux-2.6.25.10/include/asm-generic/gpio.h 2008-07-20 20:32:12.000000000 +0200
@@ -16,6 +16,12 @@
#define ARCH_NR_GPIOS 256
#endif
+static inline int gpio_is_valid(int number)
+{
+ /* only some non-negative numbers are valid */
+ return ((unsigned)number) < ARCH_NR_GPIOS;
+}
+
struct seq_file;
/**

32
target/linux/generic-2.6/patches-2.6.25/921-gpio_spi_driver.patch
View file

@ -1,8 +1,8 @@
Index: linux-2.6.25.10/include/linux/spi/spi_gpio.h
===================================================================
--- /dev/null 1970-01-01 00:00:00.000000000 +0000
+++ linux-2.6.25.10/include/linux/spi/spi_gpio.h 2008-07-18 18:19:56.000000000 +0200
@@ -0,0 +1,67 @@
+++ linux-2.6.25.10/include/linux/spi/spi_gpio.h 2008-07-20 20:10:21.000000000 +0200
@@ -0,0 +1,73 @@
+/*
+ * spi_gpio interface to platform code
+ *
@ -20,7 +20,9 @@ Index: linux-2.6.25.10/include/linux/spi/spi_gpio.h
+#include <linux/spi/spi.h>
+
+
+/** struct spi_gpio_platform_data - Data definitions for a SPI-GPIO device.
+/**
+ * struct spi_gpio_platform_data - Data definitions for a SPI-GPIO device.
+ *
+ * This structure holds information about a GPIO-based SPI device.
+ *
+ * @pin_clk: The GPIO pin number of the CLOCK pin.
@ -56,13 +58,17 @@ Index: linux-2.6.25.10/include/linux/spi/spi_gpio.h
+ void *boardinfo_setup_data;
+};
+
+/** SPI_GPIO_PLATDEV_NAME - The platform device name string.
+/**
+ * SPI_GPIO_PLATDEV_NAME - The platform device name string.
+ *
+ * The name string that has to be used for platform_device_alloc
+ * when allocating a spi-gpio device.
+ */
+#define SPI_GPIO_PLATDEV_NAME "spi-gpio"
+
+/** spi_gpio_next_id - Get another platform device ID number.
+/**
+ * spi_gpio_next_id - Get another platform device ID number.
+ *
+ * This returns the next platform device ID number that has to be used
+ * for platform_device_alloc. The ID is opaque and should not be used for
+ * anything else.
@ -73,7 +79,7 @@ Index: linux-2.6.25.10/include/linux/spi/spi_gpio.h
Index: linux-2.6.25.10/drivers/spi/spi_gpio.c
===================================================================
--- /dev/null 1970-01-01 00:00:00.000000000 +0000
+++ linux-2.6.25.10/drivers/spi/spi_gpio.c 2008-07-18 18:19:56.000000000 +0200
+++ linux-2.6.25.10/drivers/spi/spi_gpio.c 2008-07-20 20:10:21.000000000 +0200
@@ -0,0 +1,251 @@
+/*
+ * Bitbanging SPI bus driver using GPIO API
@ -328,8 +334,8 @@ Index: linux-2.6.25.10/drivers/spi/spi_gpio.c
+MODULE_LICENSE("GPL v2");
Index: linux-2.6.25.10/drivers/spi/Kconfig
===================================================================
--- linux-2.6.25.10.orig/drivers/spi/Kconfig 2008-07-18 18:19:43.000000000 +0200
+++ linux-2.6.25.10/drivers/spi/Kconfig 2008-07-18 18:19:56.000000000 +0200
--- linux-2.6.25.10.orig/drivers/spi/Kconfig 2008-07-20 20:09:48.000000000 +0200
+++ linux-2.6.25.10/drivers/spi/Kconfig 2008-07-20 20:11:48.000000000 +0200
@@ -100,6 +100,19 @@ config SPI_BUTTERFLY
inexpensive battery powered microcontroller evaluation board.
This same cable can be used to flash new firmware.
@ -341,7 +347,7 @@ Index: linux-2.6.25.10/drivers/spi/Kconfig
+ help
+ This is a platform driver that can be used for bitbanging
+ an SPI bus over GPIO pins.
+ Select this, if you have any SPI device that is connected via
+ Select this if you have any SPI device that is connected via
+ GPIO pins.
+ The module will be called spi_gpio.
+
@ -352,8 +358,8 @@ Index: linux-2.6.25.10/drivers/spi/Kconfig
depends on SPI_MASTER && ARCH_IMX && EXPERIMENTAL
Index: linux-2.6.25.10/drivers/spi/Makefile
===================================================================
--- linux-2.6.25.10.orig/drivers/spi/Makefile 2008-07-18 18:19:43.000000000 +0200
+++ linux-2.6.25.10/drivers/spi/Makefile 2008-07-18 18:19:56.000000000 +0200
--- linux-2.6.25.10.orig/drivers/spi/Makefile 2008-07-20 20:09:48.000000000 +0200
+++ linux-2.6.25.10/drivers/spi/Makefile 2008-07-20 20:10:21.000000000 +0200
@@ -16,6 +16,7 @@ obj-$(CONFIG_SPI_BFIN) += spi_bfin5xx.
obj-$(CONFIG_SPI_BITBANG) += spi_bitbang.o
obj-$(CONFIG_SPI_AU1550) += au1550_spi.o
@ -364,8 +370,8 @@ Index: linux-2.6.25.10/drivers/spi/Makefile
obj-$(CONFIG_SPI_PXA2XX) += pxa2xx_spi.o
Index: linux-2.6.25.10/MAINTAINERS
===================================================================
--- linux-2.6.25.10.orig/MAINTAINERS 2008-07-03 05:46:47.000000000 +0200
+++ linux-2.6.25.10/MAINTAINERS 2008-07-18 18:20:28.000000000 +0200
--- linux-2.6.25.10.orig/MAINTAINERS 2008-07-20 20:09:48.000000000 +0200
+++ linux-2.6.25.10/MAINTAINERS 2008-07-20 20:10:59.000000000 +0200
@@ -3685,6 +3685,11 @@ M: dbrownell@users.sourceforge.net
L: spi-devel-general@lists.sourceforge.net
S: Maintained

715
target/linux/generic-2.6/patches-2.6.25/922-gpiommc.patch
View file

@ -1,12 +1,12 @@
Index: linux-2.6.25.10/drivers/mmc/host/gpiommc.c
===================================================================
--- /dev/null 1970-01-01 00:00:00.000000000 +0000
+++ linux-2.6.25.10/drivers/mmc/host/gpiommc.c 2008-07-18 22:31:00.000000000 +0200
@@ -0,0 +1,328 @@
+++ linux-2.6.25.10/drivers/mmc/host/gpiommc.c 2008-07-20 20:49:16.000000000 +0200
@@ -0,0 +1,608 @@
+/*
+ * Driver an MMC/SD card on a bitbanging GPIO SPI bus.
+ * This module hooks up the mmc_spi and spi_gpio modules and also
+ * provides a sysfs interface.
+ * provides a configfs interface.
+ *
+ * Copyright 2008 Michael Buesch <mb@bu3sch.de>
+ *
@ -18,10 +18,13 @@ Index: linux-2.6.25.10/drivers/mmc/host/gpiommc.c
+#include <linux/list.h>
+#include <linux/mutex.h>
+#include <linux/spi/spi_gpio.h>
+#include <linux/configfs.h>
+#include <linux/gpio.h>
+#include <asm/atomic.h>
+
+
+#define PFX "gpio-mmc: "
+#define GPIOMMC_MAX_NAMELEN_STR __stringify(GPIOMMC_MAX_NAMELEN)
+
+
+struct gpiommc_device {
+ struct platform_device *pdev;
@ -63,6 +66,14 @@ Index: linux-2.6.25.10/drivers/mmc/host/gpiommc.c
+ if (!mmc_pdata)
+ goto error;
+
+#ifdef CONFIG_MMC_SPI_MODULE
+ err = request_module("mmc_spi");
+ if (err) {
+ printk(KERN_WARNING PFX
+ "Failed to request mmc_spi module.\n");
+ }
+#endif /* CONFIG_MMC_SPI_MODULE */
+
+ /* Allocate the GPIO-MMC device */
+ err = -ENOMEM;
+ d = kzalloc(sizeof(*d), GFP_KERNEL);
@ -121,152 +132,438 @@ Index: linux-2.6.25.10/drivers/mmc/host/gpiommc.c
+ struct gpiommc_platform_data *pdata = d->pdev->dev.platform_data;
+
+ platform_device_unregister(d->spi_pdev);
+ printk(KERN_INFO PFX "GPIO based MMC-Card \"%s\" removed\n", pdata->name);
+ printk(KERN_INFO PFX "GPIO based MMC-Card \"%s\" removed\n",
+ pdata->name);
+ platform_device_put(d->spi_pdev);
+
+ return 0;
+}
+
+/* Wrapper for the platform data with context data for the sysfs interface. */
+struct gpiommc_sysfs_platform_data {
+ struct gpiommc_platform_data p; /* Keep as first element */
+#ifdef CONFIG_GPIOMMC_CONFIGFS
+
+ /* The platform device that we allocated. */
+/* A device that was created through configfs */
+struct gpiommc_configfs_device {
+ struct config_item item;
+ /* The platform device, after registration. */
+ struct platform_device *pdev;
+ /* gpiommc_sysfs_list */
+ struct list_head list;
+ /* The configuration */
+ struct gpiommc_platform_data pdata;
+};
+
+static LIST_HEAD(gpiommc_sysfs_list);
+static DEFINE_MUTEX(gpiommc_sysfs_mutex);
+#define GPIO_INVALID -1
+
+static struct gpiommc_sysfs_platform_data *gpiommc_sysfs_find_dev(const char *name)
+static inline bool gpiommc_is_registered(struct gpiommc_configfs_device *dev)
+{
+ struct gpiommc_sysfs_platform_data *pdata;
+
+ list_for_each_entry(pdata, &gpiommc_sysfs_list, list) {
+ if (strcmp(pdata->p.name, name) == 0)
+ return pdata;
+ }
+
+ return NULL;
+ return (dev->pdev != NULL);
+}
+
+static ssize_t gpiommc_add_store(struct device_driver *drv,
+ const char *buf, size_t count)
+static inline struct gpiommc_configfs_device *ci_to_gpiommc(struct config_item *item)
+{
+ int res, err;
+ struct gpiommc_sysfs_platform_data pdata_local, *pdata;
+ struct platform_device *pdev;
+ unsigned int no_spi_delay = 0, mode = 0, csactivelow = 0;
+ return item ? container_of(item, struct gpiommc_configfs_device, item) : NULL;
+}
+
+ mutex_lock(&gpiommc_sysfs_mutex);
+static struct configfs_attribute gpiommc_attr_DI = {
+ .ca_owner = THIS_MODULE,
+ .ca_name = "gpio_data_in",
+ .ca_mode = S_IRUGO | S_IWUSR,
+};
+
+ pdata = &pdata_local;
+ memset(pdata, 0, sizeof(*pdata));
+static struct configfs_attribute gpiommc_attr_DO = {
+ .ca_owner = THIS_MODULE,
+ .ca_name = "gpio_data_out",
+ .ca_mode = S_IRUGO | S_IWUSR,
+};
+
+ err = -EINVAL;
+ res = sscanf(buf, "%" GPIOMMC_MAX_NAMELEN_STR "s %u %u %u %u %u %u %u %u",
+ pdata->p.name,
+ &pdata->p.pins.gpio_di,
+ &pdata->p.pins.gpio_do,
+ &pdata->p.pins.gpio_clk,
+ &pdata->p.pins.gpio_cs,
+ &mode,
+ &pdata->p.max_bus_speed,
+ &no_spi_delay,
+ &csactivelow);
+ pdata->p.mode = mode;
+ pdata->p.no_spi_delay = !!no_spi_delay;
+ pdata->p.pins.cs_activelow = !!csactivelow;
+ if (res < 9)
+ pdata->p.pins.cs_activelow = 1; /* Default: CS = activelow */
+ if (res < 8)
+ pdata->p.no_spi_delay = 0; /* Default: Delay turned on */
+ if (res < 7)
+ pdata->p.max_bus_speed = 5000000; /* Default: 5Mhz */
+ if (res < 6)
+ pdata->p.mode = 0; /* Default: SPI mode 0 */
+ if (res < 5 || res > 9)
+ goto out; /* First 5 args are mandatory. */
+static struct configfs_attribute gpiommc_attr_CLK = {
+ .ca_owner = THIS_MODULE,
+ .ca_name = "gpio_clock",
+ .ca_mode = S_IRUGO | S_IWUSR,
+};
+
+ /* Convert mode so that the SPI subsystem does understand it. */
+ switch (pdata->p.mode) {
+ case 0:
+ pdata->p.mode = SPI_MODE_0;
+ break;
+ case 1:
+ pdata->p.mode = SPI_MODE_1;
+ break;
+ case 2:
+ pdata->p.mode = SPI_MODE_2;
+ break;
+ case 3:
+ pdata->p.mode = SPI_MODE_3;
+ break;
+ default:
+ goto out; /* Invalid mode */
+static struct configfs_attribute gpiommc_attr_CS = {
+ .ca_owner = THIS_MODULE,
+ .ca_name = "gpio_chipselect",
+ .ca_mode = S_IRUGO | S_IWUSR,
+};
+
+static struct configfs_attribute gpiommc_attr_CS_activelow = {
+ .ca_owner = THIS_MODULE,
+ .ca_name = "gpio_chipselect_activelow",
+ .ca_mode = S_IRUGO | S_IWUSR,
+};
+
+static struct configfs_attribute gpiommc_attr_spimode = {
+ .ca_owner = THIS_MODULE,
+ .ca_name = "spi_mode",
+ .ca_mode = S_IRUGO | S_IWUSR,
+};
+
+static struct configfs_attribute gpiommc_attr_spidelay = {
+ .ca_owner = THIS_MODULE,
+ .ca_name = "spi_delay",
+ .ca_mode = S_IRUGO | S_IWUSR,
+};
+
+static struct configfs_attribute gpiommc_attr_max_bus_speed = {
+ .ca_owner = THIS_MODULE,
+ .ca_name = "max_bus_speed",
+ .ca_mode = S_IRUGO | S_IWUSR,
+};
+
+static struct configfs_attribute gpiommc_attr_register = {
+ .ca_owner = THIS_MODULE,
+ .ca_name = "register",
+ .ca_mode = S_IRUGO | S_IWUSR,
+};
+
+static struct configfs_attribute *gpiommc_config_attrs[] = {
+ &gpiommc_attr_DI,
+ &gpiommc_attr_DO,
+ &gpiommc_attr_CLK,
+ &gpiommc_attr_CS,
+ &gpiommc_attr_CS_activelow,
+ &gpiommc_attr_spimode,
+ &gpiommc_attr_spidelay,
+ &gpiommc_attr_max_bus_speed,
+ &gpiommc_attr_register,
+ NULL,
+};
+
+static ssize_t gpiommc_config_attr_show(struct config_item *item,
+ struct configfs_attribute *attr,
+ char *page)
+{
+ struct gpiommc_configfs_device *dev = ci_to_gpiommc(item);
+ ssize_t count = 0;
+ unsigned int gpio;
+ int err = 0;
+
+ if (attr == &gpiommc_attr_DI) {
+ gpio = dev->pdata.pins.gpio_di;
+ if (gpio == GPIO_INVALID)
+ count = snprintf(page, PAGE_SIZE, "not configured\n");
+ else
+ count = snprintf(page, PAGE_SIZE, "%u\n", gpio);
+ goto out;
+ }
+
+ err = -EEXIST;
+ if (gpiommc_sysfs_find_dev(pdata->p.name))
+ if (attr == &gpiommc_attr_DO) {
+ gpio = dev->pdata.pins.gpio_do;
+ if (gpio == GPIO_INVALID)
+ count = snprintf(page, PAGE_SIZE, "not configured\n");
+ else
+ count = snprintf(page, PAGE_SIZE, "%u\n", gpio);
+ goto out;
+
+ err = -ENOMEM;
+ pdev = platform_device_alloc(GPIOMMC_PLATDEV_NAME, gpiommc_next_id());
+ if (!pdev)
+ }
+ if (attr == &gpiommc_attr_CLK) {
+ gpio = dev->pdata.pins.gpio_clk;
+ if (gpio == GPIO_INVALID)
+ count = snprintf(page, PAGE_SIZE, "not configured\n");
+ else
+ count = snprintf(page, PAGE_SIZE, "%u\n", gpio);
+ goto out;
+
+ err = platform_device_add_data(pdev, pdata, sizeof(*pdata));
+ if (err)
+ goto err_free_pdev;
+ pdata = pdev->dev.platform_data;
+
+ err = platform_device_add(pdev);
+ if (err)
+ goto err_free_pdev;
+
+ pdata->pdev = pdev;
+ INIT_LIST_HEAD(&pdata->list);
+ list_add(&pdata->list, &gpiommc_sysfs_list);
+
+ err = 0;
+ }
+ if (attr == &gpiommc_attr_CS) {
+ gpio = dev->pdata.pins.gpio_cs;
+ if (gpio == GPIO_INVALID)
+ count = snprintf(page, PAGE_SIZE, "not configured\n");
+ else
+ count = snprintf(page, PAGE_SIZE, "%u\n", gpio);
+ goto out;
+ }
+ if (attr == &gpiommc_attr_CS_activelow) {
+ count = snprintf(page, PAGE_SIZE, "%u\n",
+ dev->pdata.pins.cs_activelow);
+ goto out;
+ }
+ if (attr == &gpiommc_attr_spimode) {
+ count = snprintf(page, PAGE_SIZE, "%u\n",
+ dev->pdata.mode);
+ goto out;
+ }
+ if (attr == &gpiommc_attr_spidelay) {
+ count = snprintf(page, PAGE_SIZE, "%u\n",
+ !dev->pdata.no_spi_delay);
+ goto out;
+ }
+ if (attr == &gpiommc_attr_max_bus_speed) {
+ count = snprintf(page, PAGE_SIZE, "%u\n",
+ dev->pdata.max_bus_speed);
+ goto out;
+ }
+ if (attr == &gpiommc_attr_register) {
+ count = snprintf(page, PAGE_SIZE, "%u\n",
+ gpiommc_is_registered(dev));
+ goto out;
+ }
+ WARN_ON(1);
+ err = -ENOSYS;
+out:
+ mutex_unlock(&gpiommc_sysfs_mutex);
+
+ return err ? err : count;
+
+err_free_pdev:
+ platform_device_put(pdev);
+ goto out;
+}
+
+static ssize_t gpiommc_remove_store(struct device_driver *drv,
+ const char *buf, size_t count)
+static int gpiommc_do_register(struct gpiommc_configfs_device *dev,
+ const char *name)
+{
+ struct gpiommc_sysfs_platform_data *pdata;
+ int err;
+
+ mutex_lock(&gpiommc_sysfs_mutex);
+ if (gpiommc_is_registered(dev))
+ return 0;
+
+ err = -ENODEV;
+ pdata = gpiommc_sysfs_find_dev(buf);
+ if (!pdata)
+ if (!gpio_is_valid(dev->pdata.pins.gpio_di) ||
+ !gpio_is_valid(dev->pdata.pins.gpio_do) ||
+ !gpio_is_valid(dev->pdata.pins.gpio_clk) ||
+ !gpio_is_valid(dev->pdata.pins.gpio_cs)) {
+ printk(KERN_ERR PFX
+ "configfs: Invalid GPIO pin number(s)\n");
+ return -EINVAL;
+ }
+
+ strlcpy(dev->pdata.name, name,
+ sizeof(dev->pdata.name));
+
+ dev->pdev = platform_device_alloc(GPIOMMC_PLATDEV_NAME,
+ gpiommc_next_id());
+ if (!dev->pdev)
+ return -ENOMEM;
+ err = platform_device_add_data(dev->pdev, &dev->pdata,
+ sizeof(dev->pdata));
+ if (err) {
+ platform_device_put(dev->pdev);
+ return err;
+ }
+ err = platform_device_add(dev->pdev);
+ if (err) {
+ platform_device_put(dev->pdev);
+ return err;
+ }
+
+ return 0;
+}
+
+static void gpiommc_do_unregister(struct gpiommc_configfs_device *dev)
+{
+ if (!gpiommc_is_registered(dev))
+ return;
+
+ platform_device_unregister(dev->pdev);
+ dev->pdev = NULL;
+}
+
+static ssize_t gpiommc_config_attr_store(struct config_item *item,
+ struct configfs_attribute *attr,
+ const char *page, size_t count)
+{
+ struct gpiommc_configfs_device *dev = ci_to_gpiommc(item);
+ int err = -EINVAL;
+ unsigned long data;
+
+ if (attr == &gpiommc_attr_register) {
+ err = strict_strtoul(page, 10, &data);
+ if (err)
+ goto out;
+ err = -EINVAL;
+ if (data == 1)
+ err = gpiommc_do_register(dev, item->ci_name);
+ if (data == 0) {
+ gpiommc_do_unregister(dev);
+ err = 0;
+ }
+ goto out;
+ }
+
+ list_del(&pdata->list);
+ platform_device_unregister(pdata->pdev);
+ if (gpiommc_is_registered(dev)) {
+ /* The rest of the config parameters can only be set
+ * as long as the device is not registered, yet. */
+ err = -EBUSY;
+ goto out;
+ }
+
+ if (attr == &gpiommc_attr_DI) {
+ err = strict_strtoul(page, 10, &data);
+ if (err)
+ goto out;
+ err = -EINVAL;
+ if (!gpio_is_valid(data))
+ goto out;
+ dev->pdata.pins.gpio_di = data;
+ err = 0;
+ goto out;
+ }
+ if (attr == &gpiommc_attr_DO) {
+ err = strict_strtoul(page, 10, &data);
+ if (err)
+ goto out;
+ err = -EINVAL;
+ if (!gpio_is_valid(data))
+ goto out;
+ dev->pdata.pins.gpio_do = data;
+ err = 0;
+ goto out;
+ }
+ if (attr == &gpiommc_attr_CLK) {
+ err = strict_strtoul(page, 10, &data);
+ if (err)
+ goto out;
+ err = -EINVAL;
+ if (!gpio_is_valid(data))
+ goto out;
+ dev->pdata.pins.gpio_clk = data;
+ err = 0;
+ goto out;
+ }
+ if (attr == &gpiommc_attr_CS) {
+ err = strict_strtoul(page, 10, &data);
+ if (err)
+ goto out;
+ err = -EINVAL;
+ if (!gpio_is_valid(data))
+ goto out;
+ dev->pdata.pins.gpio_cs = data;
+ err = 0;
+ goto out;
+ }
+ if (attr == &gpiommc_attr_CS_activelow) {
+ err = strict_strtoul(page, 10, &data);
+ if (err)
+ goto out;
+ err = -EINVAL;
+ if (data != 0 && data != 1)
+ goto out;
+ dev->pdata.pins.cs_activelow = data;
+ err = 0;
+ goto out;
+ }
+ if (attr == &gpiommc_attr_spimode) {
+ err = strict_strtoul(page, 10, &data);
+ if (err)
+ goto out;
+ err = -EINVAL;
+ switch (data) {
+ case 0:
+ dev->pdata.mode = SPI_MODE_0;
+ break;
+ case 1:
+ dev->pdata.mode = SPI_MODE_1;
+ break;
+ case 2:
+ dev->pdata.mode = SPI_MODE_2;
+ break;
+ case 3:
+ dev->pdata.mode = SPI_MODE_3;
+ break;
+ default:
+ goto out;
+ }
+ err = 0;
+ goto out;
+ }
+ if (attr == &gpiommc_attr_spidelay) {
+ err = strict_strtoul(page, 10, &data);
+ if (err)
+ goto out;
+ err = -EINVAL;
+ if (data != 0 && data != 1)
+ goto out;
+ dev->pdata.no_spi_delay = !data;
+ err = 0;
+ goto out;
+ }
+ if (attr == &gpiommc_attr_max_bus_speed) {
+ err = strict_strtoul(page, 10, &data);
+ if (err)
+ goto out;
+ err = -EINVAL;
+ if (data > UINT_MAX)
+ goto out;
+ dev->pdata.max_bus_speed = data;
+ err = 0;
+ goto out;
+ }
+ WARN_ON(1);
+ err = -ENOSYS;
+out:
+ mutex_unlock(&gpiommc_sysfs_mutex);
+
+ return err ? err : count;
+}
+
+static DRIVER_ATTR(add, 0200,
+ NULL, gpiommc_add_store);
+static DRIVER_ATTR(remove, 0200,
+ NULL, gpiommc_remove_store);
+static void gpiommc_config_item_release(struct config_item *item)
+{
+ struct gpiommc_configfs_device *dev = ci_to_gpiommc(item);
+
+ kfree(dev);
+}
+
+static struct configfs_item_operations gpiommc_config_item_ops = {
+ .release = gpiommc_config_item_release,
+ .show_attribute = gpiommc_config_attr_show,
+ .store_attribute = gpiommc_config_attr_store,
+};
+
+static struct config_item_type gpiommc_dev_ci_type = {
+ .ct_item_ops = &gpiommc_config_item_ops,
+ .ct_attrs = gpiommc_config_attrs,
+ .ct_owner = THIS_MODULE,
+};
+
+static struct config_item *gpiommc_make_item(struct config_group *group,
+ const char *name)
+{
+ struct gpiommc_configfs_device *dev;
+
+ if (strlen(name) > GPIOMMC_MAX_NAMELEN) {
+ printk(KERN_ERR PFX "configfs: device name too long\n");
+ return NULL;
+ }
+
+ dev = kzalloc(sizeof(*dev), GFP_KERNEL);
+ if (!dev)
+ return NULL;
+
+ config_item_init_type_name(&dev->item, name,
+ &gpiommc_dev_ci_type);
+
+ /* Assign default configuration */
+ dev->pdata.pins.gpio_di = GPIO_INVALID;
+ dev->pdata.pins.gpio_do = GPIO_INVALID;
+ dev->pdata.pins.gpio_clk = GPIO_INVALID;
+ dev->pdata.pins.gpio_cs = GPIO_INVALID;
+ dev->pdata.pins.cs_activelow = 1;
+ dev->pdata.mode = SPI_MODE_0;
+ dev->pdata.no_spi_delay = 0;
+ dev->pdata.max_bus_speed = 5000000; /* 5 MHz */
+
+ return &(dev->item);
+}
+
+static void gpiommc_drop_item(struct config_group *group,
+ struct config_item *item)
+{
+ struct gpiommc_configfs_device *dev = ci_to_gpiommc(item);
+
+ gpiommc_do_unregister(dev);
+ kfree(dev);
+}
+
+static struct configfs_group_operations gpiommc_ct_group_ops = {
+ .make_item = gpiommc_make_item,
+ .drop_item = gpiommc_drop_item,
+};
+
+static struct config_item_type gpiommc_ci_type = {
+ .ct_group_ops = &gpiommc_ct_group_ops,
+ .ct_owner = THIS_MODULE,
+};
+
+static struct configfs_subsystem gpiommc_subsys = {
+ .su_group = {
+ .cg_item = {
+ .ci_namebuf = GPIOMMC_PLATDEV_NAME,
+ .ci_type = &gpiommc_ci_type,
+ },
+ },
+ .su_mutex = __MUTEX_INITIALIZER(gpiommc_subsys.su_mutex),
+};
+
+#endif /* CONFIG_GPIOMMC_CONFIGFS */
+
+static struct platform_driver gpiommc_plat_driver = {
+ .probe = gpiommc_probe,
@ -292,50 +589,33 @@ Index: linux-2.6.25.10/drivers/mmc/host/gpiommc.c
+ err = platform_driver_register(&gpiommc_plat_driver);
+ if (err)
+ return err;
+ err = driver_create_file(&gpiommc_plat_driver.driver,
+ &driver_attr_add);
+ if (err)
+ goto err_drv_unreg;
+ err = driver_create_file(&gpiommc_plat_driver.driver,
+ &driver_attr_remove);
+ if (err)
+ goto err_remove_add;
+
+#ifdef CONFIG_GPIOMMC_CONFIGFS
+ config_group_init(&gpiommc_subsys.su_group);
+ err = configfs_register_subsystem(&gpiommc_subsys);
+ if (err) {
+ platform_driver_unregister(&gpiommc_plat_driver);
+ return err;
+ }
+#endif /* CONFIG_GPIOMMC_CONFIGFS */
+
+ return 0;
+
+err_remove_add:
+ driver_remove_file(&gpiommc_plat_driver.driver,
+ &driver_attr_add);
+err_drv_unreg:
+ platform_driver_unregister(&gpiommc_plat_driver);
+ return err;
+}
+module_init(gpiommc_modinit);
+
+static void __exit gpiommc_modexit(void)
+{
+ struct gpiommc_sysfs_platform_data *pdata, *pdata_tmp;
+
+ driver_remove_file(&gpiommc_plat_driver.driver,
+ &driver_attr_remove);
+ driver_remove_file(&gpiommc_plat_driver.driver,
+ &driver_attr_add);
+
+ mutex_lock(&gpiommc_sysfs_mutex);
+ list_for_each_entry_safe(pdata, pdata_tmp, &gpiommc_sysfs_list, list) {
+ list_del(&pdata->list);
+ platform_device_unregister(pdata->pdev);
+ }
+ mutex_unlock(&gpiommc_sysfs_mutex);
+
+#ifdef CONFIG_GPIOMMC_CONFIGFS
+ configfs_unregister_subsystem(&gpiommc_subsys);
+#endif
+ platform_driver_unregister(&gpiommc_plat_driver);
+}
+module_exit(gpiommc_modexit);
Index: linux-2.6.25.10/drivers/mmc/host/Kconfig
===================================================================
--- linux-2.6.25.10.orig/drivers/mmc/host/Kconfig 2008-07-18 22:30:36.000000000 +0200
+++ linux-2.6.25.10/drivers/mmc/host/Kconfig 2008-07-18 22:31:00.000000000 +0200
@@ -130,3 +130,23 @@ config MMC_SPI
--- linux-2.6.25.10.orig/drivers/mmc/host/Kconfig 2008-07-20 20:32:22.000000000 +0200
+++ linux-2.6.25.10/drivers/mmc/host/Kconfig 2008-07-20 20:33:20.000000000 +0200
@@ -130,3 +130,27 @@ config MMC_SPI
If unsure, or if your system has no SPI master driver, say N.
@ -347,8 +627,8 @@ Index: linux-2.6.25.10/drivers/mmc/host/Kconfig
+ MMC/SD cards can be used on a GPIO based bus by bitbanging
+ the SPI protocol in software.
+
+ This driver provides a sysfs interface to dynamically create
+ and destroy GPIO-based MMC/SD card interfaces. It also provides
+ This driver provides a configfs interface to dynamically create
+ and destroy GPIO-based MMC/SD card devices. It also provides
+ a platform device interface API.
+ See Documentation/gpiommc.txt for details.
+
@ -356,23 +636,28 @@ Index: linux-2.6.25.10/drivers/mmc/host/Kconfig
+
+ If unsure, say N.
+
+config MMC_S3C
+ tristate "Samsung S3C SD/MMC Card Interface support"
+ depends on ARCH_S3C2410 && MMC
+config GPIOMMC_CONFIGFS
+ bool
+ depends on GPIOMMC && CONFIGFS_FS
+ default y
+ help
+ This option automatically enables configfs support for gpiommc
+ if configfs is available.
Index: linux-2.6.25.10/drivers/mmc/host/Makefile
===================================================================
--- linux-2.6.25.10.orig/drivers/mmc/host/Makefile 2008-07-18 22:30:36.000000000 +0200
+++ linux-2.6.25.10/drivers/mmc/host/Makefile 2008-07-18 22:31:20.000000000 +0200
@@ -18,3 +18,4 @@ obj-$(CONFIG_MMC_AT91) += at91_mci.o
--- linux-2.6.25.10.orig/drivers/mmc/host/Makefile 2008-07-20 20:32:22.000000000 +0200
+++ linux-2.6.25.10/drivers/mmc/host/Makefile 2008-07-20 20:33:20.000000000 +0200
@@ -17,4 +17,4 @@ obj-$(CONFIG_MMC_OMAP) += omap.o
obj-$(CONFIG_MMC_AT91) += at91_mci.o
obj-$(CONFIG_MMC_TIFM_SD) += tifm_sd.o
obj-$(CONFIG_MMC_SPI) += mmc_spi.o
-
+obj-$(CONFIG_GPIOMMC) += gpiommc.o
Index: linux-2.6.25.10/include/linux/mmc/gpiommc.h
===================================================================
--- /dev/null 1970-01-01 00:00:00.000000000 +0000
+++ linux-2.6.25.10/include/linux/mmc/gpiommc.h 2008-07-18 22:31:00.000000000 +0200
@@ -0,0 +1,62 @@
+++ linux-2.6.25.10/include/linux/mmc/gpiommc.h 2008-07-20 20:33:20.000000000 +0200
@@ -0,0 +1,71 @@
+/*
+ * Device driver for MMC/SD cards driven over a GPIO bus.
+ *
@ -387,8 +672,11 @@ Index: linux-2.6.25.10/include/linux/mmc/gpiommc.h
+
+
+#define GPIOMMC_MAX_NAMELEN 15
+#define GPIOMMC_MAX_NAMELEN_STR __stringify(GPIOMMC_MAX_NAMELEN)
+
+/** struct gpiommc_pins - Hardware pin assignments
+/**
+ * struct gpiommc_pins - Hardware pin assignments
+ *
+ * @gpio_di: The GPIO number of the DATA IN pin
+ * @gpio_do: The GPIO number of the DATA OUT pin
+ * @gpio_clk: The GPIO number of the CLOCK pin
@ -403,7 +691,9 @@ Index: linux-2.6.25.10/include/linux/mmc/gpiommc.h
+ bool cs_activelow;
+};
+
+/** struct gpiommc_platform_data - Platform data for a MMC-over-SPI-GPIO device.
+/**
+ * struct gpiommc_platform_data - Platform data for a MMC-over-SPI-GPIO device.
+ *
+ * @name: The unique name string of the device.
+ * @pins: The hardware pin assignments.
+ * @mode: The hardware mode. This is either SPI_MODE_0,
@ -421,13 +711,17 @@ Index: linux-2.6.25.10/include/linux/mmc/gpiommc.h
+ unsigned int max_bus_speed;
+};
+
+/** GPIOMMC_PLATDEV_NAME - The platform device name string.
+/**
+ * GPIOMMC_PLATDEV_NAME - The platform device name string.
+ *
+ * The name string that has to be used for platform_device_alloc
+ * when allocating a gpiommc device.
+ */
+#define GPIOMMC_PLATDEV_NAME "gpiommc"
+
+/** gpiommc_next_id - Get another platform device ID number.
+/**
+ * gpiommc_next_id - Get another platform device ID number.
+ *
+ * This returns the next platform device ID number that has to be used
+ * for platform_device_alloc. The ID is opaque and should not be used for
+ * anything else.
@ -438,16 +732,16 @@ Index: linux-2.6.25.10/include/linux/mmc/gpiommc.h
Index: linux-2.6.25.10/Documentation/gpiommc.txt
===================================================================
--- /dev/null 1970-01-01 00:00:00.000000000 +0000
+++ linux-2.6.25.10/Documentation/gpiommc.txt 2008-07-18 22:31:00.000000000 +0200
@@ -0,0 +1,96 @@
+++ linux-2.6.25.10/Documentation/gpiommc.txt 2008-07-20 20:33:20.000000000 +0200
@@ -0,0 +1,97 @@
+GPIOMMC - Driver for an MMC/SD card on a bitbanging GPIO SPI bus
+================================================================
+
+The gpiommc module hooks up the mmc_spi and spi_gpio modules for running an
+MMC or SD card on GPIO pins.
+
+Two interfaces for registering a new MMC/SD card device are provided.
+A static platform-device based mechanism and a dynamic sysfs based interface.
+Two interfaces for registering a new MMC/SD card device are provided:
+A static platform-device based mechanism and a dynamic configfs based interface.
+
+
+Registering devices via platform-device
@ -457,7 +751,7 @@ Index: linux-2.6.25.10/Documentation/gpiommc.txt
+part of the hardware platform. This is most useful only for embedded machines
+with MMC/SD devices statically connected to the platform GPIO bus.
+
+The data structures are declared in <linux/mmc/gpiommc.h>
+The data structures are declared in <linux/mmc/gpiommc.h>.
+
+To register a new device, define an instance of struct gpiommc_platform_data.
+This structure holds any information about how the device is hooked up to the
@ -474,72 +768,73 @@ Index: linux-2.6.25.10/Documentation/gpiommc.txt
+
+ err = platform_device_add_data(pdev, pdata, sizeof(struct gpiommc_platform_data));
+
+You may free the local instance of struct gpiommc_platform_data now.
+You may free the local instance of struct gpiommc_platform_data now. (So the
+struct may be allocated on the stack, too).
+Now simply register the platform device.
+
+ err = platform_device_add(pdev);
+
+Done. The gpiommc probe routine should be called and you should see a dmesg
+message for the added device.
+Done. The gpiommc probe routine will be invoked now and you should see a kernel
+log message for the added device.
+
+
+Registering devices via sysfs
+=============================
+Registering devices via configfs
+================================
+
+MMC/SD cards connected via GPIO often are a pretty dynamic thing. For example
+MMC/SD cards connected via GPIO often are a pretty dynamic thing, as for example
+selfmade hacks for soldering an MMC/SD card to standard GPIO pins on embedded
+hardware are a common situation.
+So we provide a dynamic interface to conveniently handle adding and removing
+devices from userspace, without the need to recompile the kernel.
+
+There are two sysfs files responsible for that:
+export ADD=/sys/bus/platform/drivers/gpiommc/add
+export REMOVE=/sys/bus/platform/drivers/gpiommc/remove
+The "gpiommc" subdirectory at the configfs mountpoint is used for handling
+the dynamic configuration.
+
+To add a new device, simply echo the configuration string to the "add" file.
+The config string is composed out of the following elements:
+To create a new device, it must first be allocated with mkdir.
+The following command will allocate a device named "my_mmc":
+ mkdir /config/gpiommc/my_mmc
+
+DEVNAME DIpin DOpin CLKpin CSpin SPIMODE MAXBUSSPEED NO_SPI_DELAY CSACTIVELOW
+There are several configuration files available in the new
+/config/gpiommc/my_mmc/ directory:
+
+DEVNAME is a unique name string for the device.
+DIpin is the SPI DI GPIO pin.
+DOpin is the SPI DO GPIO pin.
+CLKpin is the SPI CLOCK GPIO pin.
+CSpin is the SPI CHIPSELECT GPIO pin.
+SPIMODE is the hardware mode the device will run at. Can be 0-3.
+MAXBUSSPEED is the maximum bus speed in Hertz.
+NO_SPI_DELAY can be 1 or 0. If it is 1, then the lowlevel SPI delay
+will not be performed. This is not standards compliant, but may be required
+to gain reasonable speeds on embedded hardware.
+CSACTIVELOW can be 1 or 0. If it is 1, the chip is considered to be selected, if CS
+is at a logical 0.
+gpio_data_in = The SPI data-IN GPIO pin number.
+gpio_data_out = The SPI data-OUT GPIO pin number.
+gpio_clock = The SPI Clock GPIO pin number.
+gpio_chipselect = The SPI Chipselect GPIO pin number.
+gpio_chipselect_activelow = Boolean. If 0, Chipselect is active-HIGH.
+ If 1, Chipselect is active-LOW.
+spi_mode = The SPI data mode. Can be 0-3.
+spi_delay = Enable all delays in the lowlevel bitbanging.
+max_bus_speed = The maximum SPI bus speed. In Hertz.
+
+Note that the elements SPIMODE, MAXBUSSPEED and NO_SPI_DELAY are optional
+and can be omitted.
+SPIMODE will default to 0.
+MAXBUSSSPEED will default to 5Mhz.
+NO_SPI_DELAY will default to 0.
+CSACTIVELOW will default to 1.
+register = Not a configuration parameter.
+ Used to register the configured card
+ with the kernel.
+
+Example:
+The device must first get configured and then registered by writing "1" to
+the "register" file.
+The configuration parameters "gpio_data_in", "gpio_data_out", "gpio_clock"
+and "gpio_chipselect" are essential and _must_ be configured before writing
+"1" to the "register" file. The registration will fail, otherwise.
+
+ echo -n "my_device 5 4 3 7 0 1000000 1" > $ADD
+The default values for the other parameters are:
+gpio_chipselect_activelow = 1 (CS active-LOW)
+spi_mode = 0 (SPI_MODE_0)
+spi_delay = 1 (enabled)
+max_bus_speed = 5000000 (5 Mhz)
+
+This will add a new device called "my_device" with the GPIO pins assigned as
+DI=5, DO=4, CLK=3, CS=7
+The hardware mode will be SPI_MODE_0.
+The maximum bus speed will be 1000000 Hz (1Mhz)
+And the explicit SPI delay at the lowlevel bitbang loop will be switched off.
+Configuration values can not be changed after registration. To unregister
+the device, write a "0" to the "register" file. The configuration can be
+changed again after unregistering.
+
+To remove a device, simply echo the device name string to the "remove" file.
+
+Example:
+
+ echo -n "my_device" > $REMOVE
+To completely remove the device, simply rmdir the directory
+(/config/gpiommc/my_mmc in this example).
+There's no need to first unregister the device before removing it. That will
+be done automatically.
Index: linux-2.6.25.10/MAINTAINERS
===================================================================
--- linux-2.6.25.10.orig/MAINTAINERS 2008-07-18 22:30:41.000000000 +0200
+++ linux-2.6.25.10/MAINTAINERS 2008-07-18 22:31:00.000000000 +0200
--- linux-2.6.25.10.orig/MAINTAINERS 2008-07-20 20:33:20.000000000 +0200
+++ linux-2.6.25.10/MAINTAINERS 2008-07-20 20:33:20.000000000 +0200
@@ -1736,6 +1736,11 @@ L: gigaset307x-common@lists.sourceforge.
W: http://gigaset307x.sourceforge.net/
S: Maintained