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@ -1,12 +1,12 @@
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Index: linux-2.6.25.10/drivers/mmc/host/gpiommc.c
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===================================================================
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--- /dev/null 1970-01-01 00:00:00.000000000 +0000
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+++ linux-2.6.25.10/drivers/mmc/host/gpiommc.c 2008-07-18 22:31:00.000000000 +0200
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@@ -0,0 +1,328 @@
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+++ linux-2.6.25.10/drivers/mmc/host/gpiommc.c 2008-07-20 20:49:16.000000000 +0200
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@@ -0,0 +1,608 @@
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+/*
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+ * Driver an MMC/SD card on a bitbanging GPIO SPI bus.
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+ * This module hooks up the mmc_spi and spi_gpio modules and also
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+ * provides a sysfs interface.
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+ * provides a configfs interface.
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+ *
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+ * Copyright 2008 Michael Buesch <mb@bu3sch.de>
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+ *
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@ -18,10 +18,13 @@ Index: linux-2.6.25.10/drivers/mmc/host/gpiommc.c
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+#include <linux/list.h>
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+#include <linux/mutex.h>
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+#include <linux/spi/spi_gpio.h>
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+#include <linux/configfs.h>
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+#include <linux/gpio.h>
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+#include <asm/atomic.h>
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+
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+
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+#define PFX "gpio-mmc: "
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+#define GPIOMMC_MAX_NAMELEN_STR __stringify(GPIOMMC_MAX_NAMELEN)
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+
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+
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+struct gpiommc_device {
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+ struct platform_device *pdev;
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@ -63,6 +66,14 @@ Index: linux-2.6.25.10/drivers/mmc/host/gpiommc.c
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+ if (!mmc_pdata)
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+ goto error;
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+
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+#ifdef CONFIG_MMC_SPI_MODULE
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+ err = request_module("mmc_spi");
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+ if (err) {
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+ printk(KERN_WARNING PFX
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+ "Failed to request mmc_spi module.\n");
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+ }
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+#endif /* CONFIG_MMC_SPI_MODULE */
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+
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+ /* Allocate the GPIO-MMC device */
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+ err = -ENOMEM;
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+ d = kzalloc(sizeof(*d), GFP_KERNEL);
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@ -121,152 +132,438 @@ Index: linux-2.6.25.10/drivers/mmc/host/gpiommc.c
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+ struct gpiommc_platform_data *pdata = d->pdev->dev.platform_data;
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+
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+ platform_device_unregister(d->spi_pdev);
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+ printk(KERN_INFO PFX "GPIO based MMC-Card \"%s\" removed\n", pdata->name);
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+ printk(KERN_INFO PFX "GPIO based MMC-Card \"%s\" removed\n",
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+ pdata->name);
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+ platform_device_put(d->spi_pdev);
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+
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+ return 0;
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+}
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+
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+/* Wrapper for the platform data with context data for the sysfs interface. */
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+struct gpiommc_sysfs_platform_data {
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+ struct gpiommc_platform_data p; /* Keep as first element */
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+#ifdef CONFIG_GPIOMMC_CONFIGFS
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+
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+ /* The platform device that we allocated. */
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+/* A device that was created through configfs */
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+struct gpiommc_configfs_device {
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+ struct config_item item;
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+ /* The platform device, after registration. */
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+ struct platform_device *pdev;
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+ /* gpiommc_sysfs_list */
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+ struct list_head list;
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+ /* The configuration */
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+ struct gpiommc_platform_data pdata;
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+};
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+
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+static LIST_HEAD(gpiommc_sysfs_list);
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+static DEFINE_MUTEX(gpiommc_sysfs_mutex);
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+#define GPIO_INVALID -1
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+
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+static struct gpiommc_sysfs_platform_data *gpiommc_sysfs_find_dev(const char *name)
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+static inline bool gpiommc_is_registered(struct gpiommc_configfs_device *dev)
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+{
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+ struct gpiommc_sysfs_platform_data *pdata;
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+
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+ list_for_each_entry(pdata, &gpiommc_sysfs_list, list) {
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+ if (strcmp(pdata->p.name, name) == 0)
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+ return pdata;
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+ }
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+
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+ return NULL;
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+ return (dev->pdev != NULL);
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+}
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+
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+static ssize_t gpiommc_add_store(struct device_driver *drv,
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+ const char *buf, size_t count)
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+static inline struct gpiommc_configfs_device *ci_to_gpiommc(struct config_item *item)
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+{
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+ int res, err;
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+ struct gpiommc_sysfs_platform_data pdata_local, *pdata;
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+ struct platform_device *pdev;
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+ unsigned int no_spi_delay = 0, mode = 0, csactivelow = 0;
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+ return item ? container_of(item, struct gpiommc_configfs_device, item) : NULL;
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+}
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+
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+ mutex_lock(&gpiommc_sysfs_mutex);
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+static struct configfs_attribute gpiommc_attr_DI = {
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+ .ca_owner = THIS_MODULE,
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+ .ca_name = "gpio_data_in",
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+ .ca_mode = S_IRUGO | S_IWUSR,
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+};
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+
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+ pdata = &pdata_local;
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+ memset(pdata, 0, sizeof(*pdata));
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+static struct configfs_attribute gpiommc_attr_DO = {
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+ .ca_owner = THIS_MODULE,
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+ .ca_name = "gpio_data_out",
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+ .ca_mode = S_IRUGO | S_IWUSR,
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+};
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+
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+ err = -EINVAL;
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+ res = sscanf(buf, "%" GPIOMMC_MAX_NAMELEN_STR "s %u %u %u %u %u %u %u %u",
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+ pdata->p.name,
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+ &pdata->p.pins.gpio_di,
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+ &pdata->p.pins.gpio_do,
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+ &pdata->p.pins.gpio_clk,
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+ &pdata->p.pins.gpio_cs,
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+ &mode,
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+ &pdata->p.max_bus_speed,
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+ &no_spi_delay,
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+ &csactivelow);
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+ pdata->p.mode = mode;
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+ pdata->p.no_spi_delay = !!no_spi_delay;
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+ pdata->p.pins.cs_activelow = !!csactivelow;
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+ if (res < 9)
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+ pdata->p.pins.cs_activelow = 1; /* Default: CS = activelow */
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+ if (res < 8)
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+ pdata->p.no_spi_delay = 0; /* Default: Delay turned on */
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+ if (res < 7)
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+ pdata->p.max_bus_speed = 5000000; /* Default: 5Mhz */
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+ if (res < 6)
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+ pdata->p.mode = 0; /* Default: SPI mode 0 */
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+ if (res < 5 || res > 9)
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+ goto out; /* First 5 args are mandatory. */
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+static struct configfs_attribute gpiommc_attr_CLK = {
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+ .ca_owner = THIS_MODULE,
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+ .ca_name = "gpio_clock",
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+ .ca_mode = S_IRUGO | S_IWUSR,
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+};
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+
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+ /* Convert mode so that the SPI subsystem does understand it. */
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+ switch (pdata->p.mode) {
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+ case 0:
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+ pdata->p.mode = SPI_MODE_0;
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+ break;
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+ case 1:
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+ pdata->p.mode = SPI_MODE_1;
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+ break;
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+ case 2:
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+ pdata->p.mode = SPI_MODE_2;
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+ break;
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+ case 3:
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+ pdata->p.mode = SPI_MODE_3;
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+ break;
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+ default:
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+ goto out; /* Invalid mode */
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+static struct configfs_attribute gpiommc_attr_CS = {
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+ .ca_owner = THIS_MODULE,
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+ .ca_name = "gpio_chipselect",
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+ .ca_mode = S_IRUGO | S_IWUSR,
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+};
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+
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+static struct configfs_attribute gpiommc_attr_CS_activelow = {
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+ .ca_owner = THIS_MODULE,
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+ .ca_name = "gpio_chipselect_activelow",
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+ .ca_mode = S_IRUGO | S_IWUSR,
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+};
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+
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+static struct configfs_attribute gpiommc_attr_spimode = {
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+ .ca_owner = THIS_MODULE,
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+ .ca_name = "spi_mode",
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+ .ca_mode = S_IRUGO | S_IWUSR,
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+};
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+
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+static struct configfs_attribute gpiommc_attr_spidelay = {
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+ .ca_owner = THIS_MODULE,
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+ .ca_name = "spi_delay",
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+ .ca_mode = S_IRUGO | S_IWUSR,
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+};
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+
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+static struct configfs_attribute gpiommc_attr_max_bus_speed = {
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+ .ca_owner = THIS_MODULE,
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+ .ca_name = "max_bus_speed",
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+ .ca_mode = S_IRUGO | S_IWUSR,
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+};
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+
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+static struct configfs_attribute gpiommc_attr_register = {
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+ .ca_owner = THIS_MODULE,
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+ .ca_name = "register",
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+ .ca_mode = S_IRUGO | S_IWUSR,
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+};
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+
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+static struct configfs_attribute *gpiommc_config_attrs[] = {
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+ &gpiommc_attr_DI,
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+ &gpiommc_attr_DO,
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+ &gpiommc_attr_CLK,
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+ &gpiommc_attr_CS,
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+ &gpiommc_attr_CS_activelow,
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+ &gpiommc_attr_spimode,
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+ &gpiommc_attr_spidelay,
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+ &gpiommc_attr_max_bus_speed,
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+ &gpiommc_attr_register,
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+ NULL,
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+};
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+
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+static ssize_t gpiommc_config_attr_show(struct config_item *item,
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+ struct configfs_attribute *attr,
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+ char *page)
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+{
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+ struct gpiommc_configfs_device *dev = ci_to_gpiommc(item);
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+ ssize_t count = 0;
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+ unsigned int gpio;
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+ int err = 0;
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+
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+ if (attr == &gpiommc_attr_DI) {
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+ gpio = dev->pdata.pins.gpio_di;
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+ if (gpio == GPIO_INVALID)
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+ count = snprintf(page, PAGE_SIZE, "not configured\n");
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+ else
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+ count = snprintf(page, PAGE_SIZE, "%u\n", gpio);
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+ goto out;
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+ }
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+
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+ err = -EEXIST;
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+ if (gpiommc_sysfs_find_dev(pdata->p.name))
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+ if (attr == &gpiommc_attr_DO) {
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+ gpio = dev->pdata.pins.gpio_do;
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+ if (gpio == GPIO_INVALID)
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+ count = snprintf(page, PAGE_SIZE, "not configured\n");
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+ else
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+ count = snprintf(page, PAGE_SIZE, "%u\n", gpio);
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+ goto out;
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+
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+ err = -ENOMEM;
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|
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+ pdev = platform_device_alloc(GPIOMMC_PLATDEV_NAME, gpiommc_next_id());
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+ if (!pdev)
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+ }
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+ if (attr == &gpiommc_attr_CLK) {
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+ gpio = dev->pdata.pins.gpio_clk;
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+ if (gpio == GPIO_INVALID)
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+ count = snprintf(page, PAGE_SIZE, "not configured\n");
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+ else
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+ count = snprintf(page, PAGE_SIZE, "%u\n", gpio);
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+ goto out;
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+
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+ err = platform_device_add_data(pdev, pdata, sizeof(*pdata));
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+ if (err)
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+ goto err_free_pdev;
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+ pdata = pdev->dev.platform_data;
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+
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+ err = platform_device_add(pdev);
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+ if (err)
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+ goto err_free_pdev;
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+
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|
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+ pdata->pdev = pdev;
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+ INIT_LIST_HEAD(&pdata->list);
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|
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+ list_add(&pdata->list, &gpiommc_sysfs_list);
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+
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+ err = 0;
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+ }
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|
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+ if (attr == &gpiommc_attr_CS) {
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|
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+ gpio = dev->pdata.pins.gpio_cs;
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+ if (gpio == GPIO_INVALID)
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+ count = snprintf(page, PAGE_SIZE, "not configured\n");
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+ else
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+ count = snprintf(page, PAGE_SIZE, "%u\n", gpio);
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+ goto out;
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+ }
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+ if (attr == &gpiommc_attr_CS_activelow) {
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|
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+ count = snprintf(page, PAGE_SIZE, "%u\n",
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|
|
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+ dev->pdata.pins.cs_activelow);
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+ goto out;
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+ }
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+ if (attr == &gpiommc_attr_spimode) {
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|
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+ count = snprintf(page, PAGE_SIZE, "%u\n",
|
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|
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+ dev->pdata.mode);
|
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+ goto out;
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+ }
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+ if (attr == &gpiommc_attr_spidelay) {
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|
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+ count = snprintf(page, PAGE_SIZE, "%u\n",
|
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|
|
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+ !dev->pdata.no_spi_delay);
|
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+ goto out;
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+ }
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|
|
+ 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.
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+
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+Example:
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+
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+ echo -n "my_device" > $REMOVE
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+To completely remove the device, simply rmdir the directory
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+(/config/gpiommc/my_mmc in this example).
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+There's no need to first unregister the device before removing it. That will
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+be done automatically.
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Index: linux-2.6.25.10/MAINTAINERS
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===================================================================
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--- linux-2.6.25.10.orig/MAINTAINERS 2008-07-18 22:30:41.000000000 +0200
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+++ linux-2.6.25.10/MAINTAINERS 2008-07-18 22:31:00.000000000 +0200
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--- linux-2.6.25.10.orig/MAINTAINERS 2008-07-20 20:33:20.000000000 +0200
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+++ linux-2.6.25.10/MAINTAINERS 2008-07-20 20:33:20.000000000 +0200
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@@ -1736,6 +1736,11 @@ L: gigaset307x-common@lists.sourceforge.
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W: http://gigaset307x.sourceforge.net/
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S: Maintained
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Michael Büsch