mmc: basic SDIO device model

Add the sdio bus type and basic device handling.

Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>

7 files changed, 279 insertions, 15 deletions

diff --git a/drivers/mmc/core/Makefile b/drivers/mmc/core/Makefile
index 2fa5ebbc170d..71ab3d1e1eb2 100644
--- a/drivers/mmc/core/Makefile
+++ b/drivers/mmc/core/Makefile
@@ -9,5 +9,5 @@ endif
 obj-$(CONFIG_MMC)               += mmc_core.o
 mmc_core-y                      := core.o sysfs.o bus.o host.o \
                                    mmc.o mmc_ops.o sd.o sd_ops.o \
-                                   sdio.o sdio_ops.o
+                                   sdio.o sdio_ops.o sdio_bus.o
 
diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c
index 092fa906ab86..9747455928da 100644
--- a/drivers/mmc/core/core.c
+++ b/drivers/mmc/core/core.c
@@ -29,6 +29,7 @@
 #include "core.h"
 #include "bus.h"
 #include "host.h"
+#include "sdio_bus.h"
 
 #include "mmc_ops.h"
 #include "sd_ops.h"
@@ -739,16 +740,32 @@ static int __init mmc_init(void)
                 return -ENOMEM;
 
         ret = mmc_register_bus();
-        if (ret == 0) {
-                ret = mmc_register_host_class();
-                if (ret)
-                        mmc_unregister_bus();
-        }
+        if (ret)
+                goto destroy_workqueue;
+
+        ret = mmc_register_host_class();
+        if (ret)
+                goto unregister_bus;
+
+        ret = sdio_register_bus();
+        if (ret)
+                goto unregister_host_class;
+
+        return 0;
+
+unregister_host_class:
+        mmc_unregister_host_class();
+unregister_bus:
+        mmc_unregister_bus();
+destroy_workqueue:
+        destroy_workqueue(workqueue);
+
         return ret;
 }
 
 static void __exit mmc_exit(void)
 {
+        sdio_unregister_bus();
         mmc_unregister_host_class();
         mmc_unregister_bus();
         destroy_workqueue(workqueue);
diff --git a/drivers/mmc/core/sdio.c b/drivers/mmc/core/sdio.c
index ac0dd68df8e7..444328581cec 100644
--- a/drivers/mmc/core/sdio.c
+++ b/drivers/mmc/core/sdio.c
@@ -13,21 +13,49 @@
 
 #include <linux/mmc/host.h>
 #include <linux/mmc/card.h>
+#include <linux/mmc/sdio_func.h>
 
 #include "core.h"
 #include "bus.h"
+#include "sdio_bus.h"
 #include "mmc_ops.h"
 #include "sd_ops.h"
 #include "sdio_ops.h"
 
+static int sdio_init_func(struct mmc_card *card, unsigned int fn)
+{
+        struct sdio_func *func;
+
+        BUG_ON(fn > SDIO_MAX_FUNCS);
+
+        func = sdio_alloc_func(card);
+        if (IS_ERR(func))
+                return PTR_ERR(func);
+
+        func->num = fn;
+
+        card->sdio_func[fn - 1] = func;
+
+        return 0;
+}
+
 /*
  * Host is being removed. Free up the current card.
  */
 static void mmc_sdio_remove(struct mmc_host *host)
 {
+        int i;
+
         BUG_ON(!host);
         BUG_ON(!host->card);
 
+        for (i = 0;i < host->card->sdio_funcs;i++) {
+                if (host->card->sdio_func[i]) {
+                        sdio_remove_func(host->card->sdio_func[i]);
+                        host->card->sdio_func[i] = NULL;
+                }
+        }
+
         mmc_remove_card(host->card);
         host->card = NULL;
 }
@@ -73,7 +101,7 @@ static const struct mmc_bus_ops mmc_sdio_ops = {
 int mmc_attach_sdio(struct mmc_host *host, u32 ocr)
 {
         int err;
-        int funcs;
+        int i, funcs;
         struct mmc_card *card;
 
         BUG_ON(!host);
@@ -132,13 +160,16 @@ int mmc_attach_sdio(struct mmc_host *host, u32 ocr)
         }
 
         card->type = MMC_TYPE_SDIO;
+        card->sdio_funcs = funcs;
+
+        host->card = card;
 
         /*
          * Set card RCA.
          */
         err = mmc_send_relative_addr(host, &card->rca);
         if (err)
-                goto free_card;
+                goto remove;
 
         mmc_set_bus_mode(host, MMC_BUSMODE_PUSHPULL);
 
@@ -147,23 +178,46 @@ int mmc_attach_sdio(struct mmc_host *host, u32 ocr)
          */
         err = mmc_select_card(card);
         if (err)
-                goto free_card;
+                goto remove;
 
-        host->card = card;
+        /*
+         * Initialize (but don't add) all present functions.
+         */
+        for (i = 0;i < funcs;i++) {
+                err = sdio_init_func(host->card, i + 1);
+                if (err)
+                        goto remove;
+        }
 
         mmc_release_host(host);
 
+        /*
+         * First add the card to the driver model...
+         */
         err = mmc_add_card(host->card);
         if (err)
-                goto reclaim_host;
+                goto remove_added;
+
+        /*
+         * ...then the SDIO functions.
+         */
+        for (i = 0;i < funcs;i++) {
+                err = sdio_add_func(host->card->sdio_func[i]);
+                if (err)
+                        goto remove_added;
+        }
 
         return 0;
 
-reclaim_host:
+
+remove_added:
+        /* Remove without lock if the device has been added. */
+        mmc_sdio_remove(host);
         mmc_claim_host(host);
-free_card:
-        mmc_remove_card(card);
-        host->card = NULL;
+remove:
+        /* And with lock if it hasn't been added. */
+        if (host->card)
+                mmc_sdio_remove(host);
 err:
         mmc_detach_bus(host);
         mmc_release_host(host);
diff --git a/drivers/mmc/core/sdio_bus.c b/drivers/mmc/core/sdio_bus.c
new file mode 100644
index 000000000000..59c909e1c7c6
--- /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);
+}
+
diff --git a/drivers/mmc/core/sdio_bus.h b/drivers/mmc/core/sdio_bus.h
new file mode 100644
index 000000000000..567a76821ba7
--- /dev/null
+++ b/drivers/mmc/core/sdio_bus.h
@@ -0,0 +1,22 @@
+/*
+ *  linux/drivers/mmc/core/sdio_bus.h
+ *
+ *  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.
+ */
+#ifndef _MMC_CORE_SDIO_BUS_H
+#define _MMC_CORE_SDIO_BUS_H
+
+struct sdio_func *sdio_alloc_func(struct mmc_card *card);
+int sdio_add_func(struct sdio_func *func);
+void sdio_remove_func(struct sdio_func *func);
+
+int sdio_register_bus(void);
+void sdio_unregister_bus(void);
+
+#endif
+
diff --git a/include/linux/mmc/card.h b/include/linux/mmc/card.h
index 43480ebebf9a..9f5f74482d98 100644
--- a/include/linux/mmc/card.h
+++ b/include/linux/mmc/card.h
@@ -56,6 +56,9 @@ struct sd_switch_caps {
 };
 
 struct mmc_host;
+struct sdio_func;
+
+#define SDIO_MAX_FUNCS          7
 
 /*
  * MMC device
@@ -73,6 +76,7 @@ struct mmc_card {
 #define MMC_STATE_READONLY      (1<<1)          /* card is read-only */
 #define MMC_STATE_HIGHSPEED     (1<<2)          /* card is in high speed mode */
 #define MMC_STATE_BLOCKADDR     (1<<3)          /* card uses block-addressing */
+
         u32                     raw_cid[4];     /* raw card CID */
         u32                     raw_csd[4];     /* raw card CSD */
         u32                     raw_scr[2];     /* raw card SCR */
@@ -81,6 +85,9 @@ struct mmc_card {
         struct mmc_ext_csd      ext_csd;        /* mmc v4 extended card specific */
         struct sd_scr           scr;            /* extra SD information */
         struct sd_switch_caps   sw_caps;        /* switch (CMD6) caps */
+
+        unsigned int            sdio_funcs;     /* number of SDIO functions */
+        struct sdio_func        *sdio_func[SDIO_MAX_FUNCS]; /* SDIO functions (devices) */
 };
 
 #define mmc_card_mmc(c)         ((c)->type == MMC_TYPE_MMC)
diff --git a/include/linux/mmc/sdio_func.h b/include/linux/mmc/sdio_func.h
new file mode 100644
index 000000000000..50c78db420e6
--- /dev/null
+++ b/include/linux/mmc/sdio_func.h
@@ -0,0 +1,35 @@
+/*
+ *  include/linux/mmc/sdio_func.h
+ *
+ *  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.
+ */
+
+#ifndef MMC_SDIO_FUNC_H
+#define MMC_SDIO_FUNC_H
+
+struct mmc_card;
+
+/*
+ * SDIO function devices
+ */
+struct sdio_func {
+        struct mmc_card         *card;          /* the card this device belongs to */
+        struct device           dev;            /* the device */
+        unsigned int            num;            /* function number */
+        unsigned int            state;          /* function state */
+#define SDIO_STATE_PRESENT      (1<<0)          /* present in sysfs */
+};
+
+#define sdio_func_present(f)    ((f)->state & SDIO_STATE_PRESENT)
+
+#define sdio_func_set_present(f) ((f)->state |= SDIO_STATE_PRESENT)
+
+#define sdio_func_id(f)         ((f)->dev.bus_id)
+
+#endif
+