diff options
6 files changed, 638 insertions, 236 deletions
diff --git a/package/mmc_over_gpio/Makefile b/package/mmc_over_gpio/Makefile index 20b7b6ac42..954ccfa9cf 100644 --- a/package/mmc_over_gpio/Makefile +++ b/package/mmc_over_gpio/Makefile @@ -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) diff --git a/package/mmc_over_gpio/files/mmc_over_gpio.init b/package/mmc_over_gpio/files/mmc_over_gpio.init index 57c5695d19..e276dfd1ca 100644 --- a/package/mmc_over_gpio/files/mmc_over_gpio.init +++ b/package/mmc_over_gpio/files/mmc_over_gpio.init @@ -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 } diff --git a/target/linux/brcm47xx/patches-2.6.25/710-add-gpio-is-valid.patch b/target/linux/brcm47xx/patches-2.6.25/710-add-gpio-is-valid.patch new file mode 100644 index 0000000000..bca3b4eaae --- /dev/null +++ b/target/linux/brcm47xx/patches-2.6.25/710-add-gpio-is-valid.patch @@ -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> diff --git a/target/linux/generic-2.6/patches-2.6.25/920-backport-gpio-is-valid.patch b/target/linux/generic-2.6/patches-2.6.25/920-backport-gpio-is-valid.patch new file mode 100644 index 0000000000..966270b78e --- /dev/null +++ b/target/linux/generic-2.6/patches-2.6.25/920-backport-gpio-is-valid.patch @@ -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; + + /** diff --git a/target/linux/generic-2.6/patches-2.6.25/921-gpio_spi_driver.patch b/target/linux/generic-2.6/patches-2.6.25/921-gpio_spi_driver.patch index 264386f330..1249a63188 100644 --- a/target/linux/generic-2.6/patches-2.6.25/921-gpio_spi_driver.patch +++ b/target/linux/generic-2.6/patches-2.6.25/921-gpio_spi_driver.patch @@ -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 diff --git a/target/linux/generic-2.6/patches-2.6.25/922-gpiommc.patch b/target/linux/generic-2.6/patches-2.6.25/922-gpiommc.patch index 8253202c09..8bb4c99bcd 100644 --- a/target/linux/generic-2.6/patches-2.6.25/922-gpiommc.patch +++ b/target/linux/generic-2.6/patches-2.6.25/922-gpiommc.patch @@ -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 inline bool gpiommc_is_registered(struct gpiommc_configfs_device *dev) ++{ ++ return (dev->pdev != NULL); ++} + -+static struct gpiommc_sysfs_platform_data *gpiommc_sysfs_find_dev(const char *name) ++static inline struct gpiommc_configfs_device *ci_to_gpiommc(struct config_item *item) +{ -+ struct gpiommc_sysfs_platform_data *pdata; ++ return item ? container_of(item, struct gpiommc_configfs_device, item) : NULL; ++} + -+ list_for_each_entry(pdata, &gpiommc_sysfs_list, list) { -+ if (strcmp(pdata->p.name, name) == 0) -+ return pdata; -+ } ++static struct configfs_attribute gpiommc_attr_DI = { ++ .ca_owner = THIS_MODULE, ++ .ca_name = "gpio_data_in", ++ .ca_mode = S_IRUGO | S_IWUSR, ++}; + -+ return NULL; ++static struct configfs_attribute gpiommc_attr_DO = { ++ .ca_owner = THIS_MODULE, ++ .ca_name = "gpio_data_out", ++ .ca_mode = S_IRUGO | S_IWUSR, ++}; ++ ++static struct configfs_attribute gpiommc_attr_CLK = { ++ .ca_owner = THIS_MODULE, ++ .ca_name = "gpio_clock", ++ .ca_mode = S_IRUGO | S_IWUSR, ++}; ++ ++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; ++ } ++ 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; ++ } ++ 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; ++ } ++ 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: ++ return err ? err : count; +} + -+static ssize_t gpiommc_add_store(struct device_driver *drv, -+ const char *buf, size_t count) ++static int gpiommc_do_register(struct gpiommc_configfs_device *dev, ++ const char *name) +{ -+ 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; -+ -+ mutex_lock(&gpiommc_sysfs_mutex); -+ -+ pdata = &pdata_local; -+ memset(pdata, 0, sizeof(*pdata)); -+ -+ 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. */ -+ -+ /* 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 */ ++ int err; ++ ++ if (gpiommc_is_registered(dev)) ++ return 0; ++ ++ 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; + } + -+ err = -EEXIST; -+ if (gpiommc_sysfs_find_dev(pdata->p.name)) -+ goto out; ++ 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; ++ } + -+ err = -ENOMEM; -+ pdev = platform_device_alloc(GPIOMMC_PLATDEV_NAME, gpiommc_next_id()); -+ if (!pdev) -+ goto out; ++ return 0; ++} + -+ err = platform_device_add_data(pdev, pdata, sizeof(*pdata)); -+ if (err) -+ goto err_free_pdev; -+ pdata = pdev->dev.platform_data; ++static void gpiommc_do_unregister(struct gpiommc_configfs_device *dev) ++{ ++ if (!gpiommc_is_registered(dev)) ++ return; + -+ err = platform_device_add(pdev); -+ if (err) -+ goto err_free_pdev; ++ 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; ++ } + -+ pdata->pdev = pdev; -+ INIT_LIST_HEAD(&pdata->list); -+ list_add(&pdata->list, &gpiommc_sysfs_list); ++ 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; ++ } + -+ err = 0; ++ 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; ++} + -+err_free_pdev: -+ platform_device_put(pdev); -+ goto out; ++static void gpiommc_config_item_release(struct config_item *item) ++{ ++ struct gpiommc_configfs_device *dev = ci_to_gpiommc(item); ++ ++ kfree(dev); +} + -+static ssize_t gpiommc_remove_store(struct device_driver *drv, -+ const char *buf, size_t count) ++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_sysfs_platform_data *pdata; -+ int err; ++ struct gpiommc_configfs_device *dev; + -+ mutex_lock(&gpiommc_sysfs_mutex); ++ if (strlen(name) > GPIOMMC_MAX_NAMELEN) { ++ printk(KERN_ERR PFX "configfs: device name too long\n"); ++ return NULL; ++ } + -+ err = -ENODEV; -+ pdata = gpiommc_sysfs_find_dev(buf); -+ if (!pdata) -+ goto out; ++ dev = kzalloc(sizeof(*dev), GFP_KERNEL); ++ if (!dev) ++ return NULL; + -+ list_del(&pdata->list); -+ platform_device_unregister(pdata->pdev); ++ config_item_init_type_name(&dev->item, name, ++ &gpiommc_dev_ci_type); + -+out: -+ mutex_unlock(&gpiommc_sysfs_mutex); ++ /* 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 err ? err : count; ++ return &(dev->item); +} + -+static DRIVER_ATTR(add, 0200, -+ NULL, gpiommc_add_store); -+static DRIVER_ATTR(remove, 0200, -+ NULL, gpiommc_remove_store); ++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; + -+ return 0; ++#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 */ + -+err_remove_add: -+ driver_remove_file(&gpiommc_plat_driver.driver, -+ &driver_attr_add); -+err_drv_unreg: -+ platform_driver_unregister(&gpiommc_plat_driver); -+ return err; ++ return 0; +} +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 -+ -+To add a new device, simply echo the configuration string to the "add" file. -+The config string is composed out of the following elements: -+ -+DEVNAME DIpin DOpin CLKpin CSpin SPIMODE MAXBUSSPEED NO_SPI_DELAY CSACTIVELOW -+ -+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. -+ -+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. -+ -+Example: -+ -+ echo -n "my_device 5 4 3 7 0 1000000 1" > $ADD -+ -+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. -+ -+To remove a device, simply echo the device name string to the "remove" file. -+ -+Example: -+ -+ echo -n "my_device" > $REMOVE ++The "gpiommc" subdirectory at the configfs mountpoint is used for handling ++the dynamic configuration. ++ ++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 ++ ++There are several configuration files available in the new ++/config/gpiommc/my_mmc/ directory: ++ ++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. ++ ++register = Not a configuration parameter. ++ Used to register the configured card ++ with the kernel. ++ ++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. ++ ++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) ++ ++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 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 |