diff options
Diffstat (limited to 'drivers/mmc/core/sdio_bus.c')
-rw-r--r-- | drivers/mmc/core/sdio_bus.c | 129 |
1 files changed, 129 insertions, 0 deletions
diff --git a/drivers/mmc/core/sdio_bus.c b/drivers/mmc/core/sdio_bus.c new file mode 100644 index 0000000..59c909e --- /dev/null +++ b/drivers/mmc/core/sdio_bus.c @@ -0,0 +1,129 @@ +/* + * linux/drivers/mmc/core/sdio_bus.c + * + * Copyright 2007 Pierre Ossman + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or (at + * your option) any later version. + * + * SDIO function driver model + */ + +#include <linux/device.h> +#include <linux/err.h> + +#include <linux/mmc/card.h> +#include <linux/mmc/sdio_func.h> + +#include "sdio_bus.h" + +#define dev_to_sdio_func(d) container_of(d, struct sdio_func, dev) + +/* + * This currently matches any SDIO function to any driver in order + * to help initial development and testing. + */ +static int sdio_bus_match(struct device *dev, struct device_driver *drv) +{ + return 1; +} + +static int +sdio_bus_uevent(struct device *dev, char **envp, int num_envp, char *buf, + int buf_size) +{ + envp[0] = NULL; + + return 0; +} + +static int sdio_bus_probe(struct device *dev) +{ + return -ENODEV; +} + +static int sdio_bus_remove(struct device *dev) +{ + return 0; +} + +static struct bus_type sdio_bus_type = { + .name = "sdio", + .match = sdio_bus_match, + .uevent = sdio_bus_uevent, + .probe = sdio_bus_probe, + .remove = sdio_bus_remove, +}; + +int sdio_register_bus(void) +{ + return bus_register(&sdio_bus_type); +} + +void sdio_unregister_bus(void) +{ + bus_unregister(&sdio_bus_type); +} + +static void sdio_release_func(struct device *dev) +{ + struct sdio_func *func = dev_to_sdio_func(dev); + + kfree(func); +} + +/* + * Allocate and initialise a new SDIO function structure. + */ +struct sdio_func *sdio_alloc_func(struct mmc_card *card) +{ + struct sdio_func *func; + + func = kmalloc(sizeof(struct sdio_func), GFP_KERNEL); + if (!func) + return ERR_PTR(-ENOMEM); + + memset(func, 0, sizeof(struct sdio_func)); + + func->card = card; + + device_initialize(&func->dev); + + func->dev.parent = &card->dev; + func->dev.bus = &sdio_bus_type; + func->dev.release = sdio_release_func; + + return func; +} + +/* + * Register a new SDIO function with the driver model. + */ +int sdio_add_func(struct sdio_func *func) +{ + int ret; + + snprintf(func->dev.bus_id, sizeof(func->dev.bus_id), + "%s:%d", mmc_card_id(func->card), func->num); + + ret = device_add(&func->dev); + if (ret == 0) + sdio_func_set_present(func); + + return ret; +} + +/* + * Unregister a SDIO function with the driver model, and + * (eventually) free it. + */ +void sdio_remove_func(struct sdio_func *func) +{ + if (sdio_func_present(func)) + device_del(&func->dev); + + put_device(&func->dev); +} + |