Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 583 insertions, 0 deletions

diff --git a/drivers/base/firmware_class.c b/drivers/base/firmware_class.c
new file mode 100644
index 000000000000..26c9464af80a
--- /dev/null
+++ b/drivers/base/firmware_class.c
@@ -0,0 +1,583 @@
+/*
+ * firmware_class.c - Multi purpose firmware loading support
+ *
+ * Copyright (c) 2003 Manuel Estrada Sainz <ranty@debian.org>
+ *
+ * Please see Documentation/firmware_class/ for more information.
+ *
+ */
+
+#include <linux/device.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/timer.h>
+#include <linux/vmalloc.h>
+#include <linux/interrupt.h>
+#include <linux/bitops.h>
+#include <asm/semaphore.h>
+
+#include <linux/firmware.h>
+#include "base.h"
+
+MODULE_AUTHOR("Manuel Estrada Sainz <ranty@debian.org>");
+MODULE_DESCRIPTION("Multi purpose firmware loading support");
+MODULE_LICENSE("GPL");
+
+enum {
+        FW_STATUS_LOADING,
+        FW_STATUS_DONE,
+        FW_STATUS_ABORT,
+        FW_STATUS_READY,
+};
+
+static int loading_timeout = 10;        /* In seconds */
+
+/* fw_lock could be moved to 'struct firmware_priv' but since it is just
+ * guarding for corner cases a global lock should be OK */
+static DECLARE_MUTEX(fw_lock);
+
+struct firmware_priv {
+        char fw_id[FIRMWARE_NAME_MAX];
+        struct completion completion;
+        struct bin_attribute attr_data;
+        struct firmware *fw;
+        unsigned long status;
+        int alloc_size;
+        struct timer_list timeout;
+};
+
+static inline void
+fw_load_abort(struct firmware_priv *fw_priv)
+{
+        set_bit(FW_STATUS_ABORT, &fw_priv->status);
+        wmb();
+        complete(&fw_priv->completion);
+}
+
+static ssize_t
+firmware_timeout_show(struct class *class, char *buf)
+{
+        return sprintf(buf, "%d\n", loading_timeout);
+}
+
+/**
+ * firmware_timeout_store:
+ * Description:
+ *      Sets the number of seconds to wait for the firmware.  Once
+ *      this expires an error will be return to the driver and no
+ *      firmware will be provided.
+ *
+ *      Note: zero means 'wait for ever'
+ *
+ **/
+static ssize_t
+firmware_timeout_store(struct class *class, const char *buf, size_t count)
+{
+        loading_timeout = simple_strtol(buf, NULL, 10);
+        return count;
+}
+
+static CLASS_ATTR(timeout, 0644, firmware_timeout_show, firmware_timeout_store);
+
+static void  fw_class_dev_release(struct class_device *class_dev);
+int firmware_class_hotplug(struct class_device *dev, char **envp,
+                           int num_envp, char *buffer, int buffer_size);
+
+static struct class firmware_class = {
+        .name           = "firmware",
+        .hotplug        = firmware_class_hotplug,
+        .release        = fw_class_dev_release,
+};
+
+int
+firmware_class_hotplug(struct class_device *class_dev, char **envp,
+                       int num_envp, char *buffer, int buffer_size)
+{
+        struct firmware_priv *fw_priv = class_get_devdata(class_dev);
+        int i = 0, len = 0;
+
+        if (!test_bit(FW_STATUS_READY, &fw_priv->status))
+                return -ENODEV;
+
+        if (add_hotplug_env_var(envp, num_envp, &i, buffer, buffer_size, &len,
+                        "FIRMWARE=%s", fw_priv->fw_id))
+                return -ENOMEM;
+
+        envp[i] = NULL;
+
+        return 0;
+}
+
+static ssize_t
+firmware_loading_show(struct class_device *class_dev, char *buf)
+{
+        struct firmware_priv *fw_priv = class_get_devdata(class_dev);
+        int loading = test_bit(FW_STATUS_LOADING, &fw_priv->status);
+        return sprintf(buf, "%d\n", loading);
+}
+
+/**
+ * firmware_loading_store: - loading control file
+ * Description:
+ *      The relevant values are:
+ *
+ *       1: Start a load, discarding any previous partial load.
+ *       0: Conclude the load and handle the data to the driver code.
+ *      -1: Conclude the load with an error and discard any written data.
+ **/
+static ssize_t
+firmware_loading_store(struct class_device *class_dev,
+                       const char *buf, size_t count)
+{
+        struct firmware_priv *fw_priv = class_get_devdata(class_dev);
+        int loading = simple_strtol(buf, NULL, 10);
+
+        switch (loading) {
+        case 1:
+                down(&fw_lock);
+                vfree(fw_priv->fw->data);
+                fw_priv->fw->data = NULL;
+                fw_priv->fw->size = 0;
+                fw_priv->alloc_size = 0;
+                set_bit(FW_STATUS_LOADING, &fw_priv->status);
+                up(&fw_lock);
+                break;
+        case 0:
+                if (test_bit(FW_STATUS_LOADING, &fw_priv->status)) {
+                        complete(&fw_priv->completion);
+                        clear_bit(FW_STATUS_LOADING, &fw_priv->status);
+                        break;
+                }
+                /* fallthrough */
+        default:
+                printk(KERN_ERR "%s: unexpected value (%d)\n", __FUNCTION__,
+                       loading);
+                /* fallthrough */
+        case -1:
+                fw_load_abort(fw_priv);
+                break;
+        }
+
+        return count;
+}
+
+static CLASS_DEVICE_ATTR(loading, 0644,
+                        firmware_loading_show, firmware_loading_store);
+
+static ssize_t
+firmware_data_read(struct kobject *kobj,
+                   char *buffer, loff_t offset, size_t count)
+{
+        struct class_device *class_dev = to_class_dev(kobj);
+        struct firmware_priv *fw_priv = class_get_devdata(class_dev);
+        struct firmware *fw;
+        ssize_t ret_count = count;
+
+        down(&fw_lock);
+        fw = fw_priv->fw;
+        if (test_bit(FW_STATUS_DONE, &fw_priv->status)) {
+                ret_count = -ENODEV;
+                goto out;
+        }
+        if (offset > fw->size) {
+                ret_count = 0;
+                goto out;
+        }
+        if (offset + ret_count > fw->size)
+                ret_count = fw->size - offset;
+
+        memcpy(buffer, fw->data + offset, ret_count);
+out:
+        up(&fw_lock);
+        return ret_count;
+}
+static int
+fw_realloc_buffer(struct firmware_priv *fw_priv, int min_size)
+{
+        u8 *new_data;
+
+        if (min_size <= fw_priv->alloc_size)
+                return 0;
+
+        new_data = vmalloc(fw_priv->alloc_size + PAGE_SIZE);
+        if (!new_data) {
+                printk(KERN_ERR "%s: unable to alloc buffer\n", __FUNCTION__);
+                /* Make sure that we don't keep incomplete data */
+                fw_load_abort(fw_priv);
+                return -ENOMEM;
+        }
+        fw_priv->alloc_size += PAGE_SIZE;
+        if (fw_priv->fw->data) {
+                memcpy(new_data, fw_priv->fw->data, fw_priv->fw->size);
+                vfree(fw_priv->fw->data);
+        }
+        fw_priv->fw->data = new_data;
+        BUG_ON(min_size > fw_priv->alloc_size);
+        return 0;
+}
+
+/**
+ * firmware_data_write:
+ *
+ * Description:
+ *
+ *      Data written to the 'data' attribute will be later handled to
+ *      the driver as a firmware image.
+ **/
+static ssize_t
+firmware_data_write(struct kobject *kobj,
+                    char *buffer, loff_t offset, size_t count)
+{
+        struct class_device *class_dev = to_class_dev(kobj);
+        struct firmware_priv *fw_priv = class_get_devdata(class_dev);
+        struct firmware *fw;
+        ssize_t retval;
+
+        if (!capable(CAP_SYS_RAWIO))
+                return -EPERM;
+        down(&fw_lock);
+        fw = fw_priv->fw;
+        if (test_bit(FW_STATUS_DONE, &fw_priv->status)) {
+                retval = -ENODEV;
+                goto out;
+        }
+        retval = fw_realloc_buffer(fw_priv, offset + count);
+        if (retval)
+                goto out;
+
+        memcpy(fw->data + offset, buffer, count);
+
+        fw->size = max_t(size_t, offset + count, fw->size);
+        retval = count;
+out:
+        up(&fw_lock);
+        return retval;
+}
+static struct bin_attribute firmware_attr_data_tmpl = {
+        .attr = {.name = "data", .mode = 0644, .owner = THIS_MODULE},
+        .size = 0,
+        .read = firmware_data_read,
+        .write = firmware_data_write,
+};
+
+static void
+fw_class_dev_release(struct class_device *class_dev)
+{
+        struct firmware_priv *fw_priv = class_get_devdata(class_dev);
+
+        kfree(fw_priv);
+        kfree(class_dev);
+
+        module_put(THIS_MODULE);
+}
+
+static void
+firmware_class_timeout(u_long data)
+{
+        struct firmware_priv *fw_priv = (struct firmware_priv *) data;
+        fw_load_abort(fw_priv);
+}
+
+static inline void
+fw_setup_class_device_id(struct class_device *class_dev, struct device *dev)
+{
+        /* XXX warning we should watch out for name collisions */
+        strlcpy(class_dev->class_id, dev->bus_id, BUS_ID_SIZE);
+}
+
+static int
+fw_register_class_device(struct class_device **class_dev_p,
+                         const char *fw_name, struct device *device)
+{
+        int retval;
+        struct firmware_priv *fw_priv = kmalloc(sizeof (struct firmware_priv),
+                                                GFP_KERNEL);
+        struct class_device *class_dev = kmalloc(sizeof (struct class_device),
+                                                 GFP_KERNEL);
+
+        *class_dev_p = NULL;
+
+        if (!fw_priv || !class_dev) {
+                printk(KERN_ERR "%s: kmalloc failed\n", __FUNCTION__);
+                retval = -ENOMEM;
+                goto error_kfree;
+        }
+        memset(fw_priv, 0, sizeof (*fw_priv));
+        memset(class_dev, 0, sizeof (*class_dev));
+
+        init_completion(&fw_priv->completion);
+        fw_priv->attr_data = firmware_attr_data_tmpl;
+        strlcpy(fw_priv->fw_id, fw_name, FIRMWARE_NAME_MAX);
+
+        fw_priv->timeout.function = firmware_class_timeout;
+        fw_priv->timeout.data = (u_long) fw_priv;
+        init_timer(&fw_priv->timeout);
+
+        fw_setup_class_device_id(class_dev, device);
+        class_dev->dev = device;
+        class_dev->class = &firmware_class;
+        class_set_devdata(class_dev, fw_priv);
+        retval = class_device_register(class_dev);
+        if (retval) {
+                printk(KERN_ERR "%s: class_device_register failed\n",
+                       __FUNCTION__);
+                goto error_kfree;
+        }
+        *class_dev_p = class_dev;
+        return 0;
+
+error_kfree:
+        kfree(fw_priv);
+        kfree(class_dev);
+        return retval;
+}
+
+static int
+fw_setup_class_device(struct firmware *fw, struct class_device **class_dev_p,
+                      const char *fw_name, struct device *device)
+{
+        struct class_device *class_dev;
+        struct firmware_priv *fw_priv;
+        int retval;
+
+        *class_dev_p = NULL;
+        retval = fw_register_class_device(&class_dev, fw_name, device);
+        if (retval)
+                goto out;
+
+        /* Need to pin this module until class device is destroyed */
+        __module_get(THIS_MODULE);
+
+        fw_priv = class_get_devdata(class_dev);
+
+        fw_priv->fw = fw;
+        retval = sysfs_create_bin_file(&class_dev->kobj, &fw_priv->attr_data);
+        if (retval) {
+                printk(KERN_ERR "%s: sysfs_create_bin_file failed\n",
+                       __FUNCTION__);
+                goto error_unreg;
+        }
+
+        retval = class_device_create_file(class_dev,
+                                          &class_device_attr_loading);
+        if (retval) {
+                printk(KERN_ERR "%s: class_device_create_file failed\n",
+                       __FUNCTION__);
+                goto error_unreg;
+        }
+
+        set_bit(FW_STATUS_READY, &fw_priv->status);
+        *class_dev_p = class_dev;
+        goto out;
+
+error_unreg:
+        class_device_unregister(class_dev);
+out:
+        return retval;
+}
+
+/**
+ * request_firmware: - request firmware to hotplug and wait for it
+ * Description:
+ *      @firmware will be used to return a firmware image by the name
+ *      of @name for device @device.
+ *
+ *      Should be called from user context where sleeping is allowed.
+ *
+ *      @name will be use as $FIRMWARE in the hotplug environment and
+ *      should be distinctive enough not to be confused with any other
+ *      firmware image for this or any other device.
+ **/
+int
+request_firmware(const struct firmware **firmware_p, const char *name,
+                 struct device *device)
+{
+        struct class_device *class_dev;
+        struct firmware_priv *fw_priv;
+        struct firmware *firmware;
+        int retval;
+
+        if (!firmware_p)
+                return -EINVAL;
+
+        *firmware_p = firmware = kmalloc(sizeof (struct firmware), GFP_KERNEL);
+        if (!firmware) {
+                printk(KERN_ERR "%s: kmalloc(struct firmware) failed\n",
+                       __FUNCTION__);
+                retval = -ENOMEM;
+                goto out;
+        }
+        memset(firmware, 0, sizeof (*firmware));
+
+        retval = fw_setup_class_device(firmware, &class_dev, name, device);
+        if (retval)
+                goto error_kfree_fw;
+
+        fw_priv = class_get_devdata(class_dev);
+
+        if (loading_timeout) {
+                fw_priv->timeout.expires = jiffies + loading_timeout * HZ;
+                add_timer(&fw_priv->timeout);
+        }
+
+        kobject_hotplug(&class_dev->kobj, KOBJ_ADD);
+        wait_for_completion(&fw_priv->completion);
+        set_bit(FW_STATUS_DONE, &fw_priv->status);
+
+        del_timer_sync(&fw_priv->timeout);
+
+        down(&fw_lock);
+        if (!fw_priv->fw->size || test_bit(FW_STATUS_ABORT, &fw_priv->status)) {
+                retval = -ENOENT;
+                release_firmware(fw_priv->fw);
+                *firmware_p = NULL;
+        }
+        fw_priv->fw = NULL;
+        up(&fw_lock);
+        class_device_unregister(class_dev);
+        goto out;
+
+error_kfree_fw:
+        kfree(firmware);
+        *firmware_p = NULL;
+out:
+        return retval;
+}
+
+/**
+ * release_firmware: - release the resource associated with a firmware image
+ **/
+void
+release_firmware(const struct firmware *fw)
+{
+        if (fw) {
+                vfree(fw->data);
+                kfree(fw);
+        }
+}
+
+/**
+ * register_firmware: - provide a firmware image for later usage
+ *
+ * Description:
+ *      Make sure that @data will be available by requesting firmware @name.
+ *
+ *      Note: This will not be possible until some kind of persistence
+ *      is available.
+ **/
+void
+register_firmware(const char *name, const u8 *data, size_t size)
+{
+        /* This is meaningless without firmware caching, so until we
+         * decide if firmware caching is reasonable just leave it as a
+         * noop */
+}
+
+/* Async support */
+struct firmware_work {
+        struct work_struct work;
+        struct module *module;
+        const char *name;
+        struct device *device;
+        void *context;
+        void (*cont)(const struct firmware *fw, void *context);
+};
+
+static int
+request_firmware_work_func(void *arg)
+{
+        struct firmware_work *fw_work = arg;
+        const struct firmware *fw;
+        if (!arg) {
+                WARN_ON(1);
+                return 0;
+        }
+        daemonize("%s/%s", "firmware", fw_work->name);
+        request_firmware(&fw, fw_work->name, fw_work->device);
+        fw_work->cont(fw, fw_work->context);
+        release_firmware(fw);
+        module_put(fw_work->module);
+        kfree(fw_work);
+        return 0;
+}
+
+/**
+ * request_firmware_nowait:
+ *
+ * Description:
+ *      Asynchronous variant of request_firmware() for contexts where
+ *      it is not possible to sleep.
+ *
+ *      @cont will be called asynchronously when the firmware request is over.
+ *
+ *      @context will be passed over to @cont.
+ *
+ *      @fw may be %NULL if firmware request fails.
+ *
+ **/
+int
+request_firmware_nowait(
+        struct module *module,
+        const char *name, struct device *device, void *context,
+        void (*cont)(const struct firmware *fw, void *context))
+{
+        struct firmware_work *fw_work = kmalloc(sizeof (struct firmware_work),
+                                                GFP_ATOMIC);
+        int ret;
+
+        if (!fw_work)
+                return -ENOMEM;
+        if (!try_module_get(module)) {
+                kfree(fw_work);
+                return -EFAULT;
+        }
+
+        *fw_work = (struct firmware_work) {
+                .module = module,
+                .name = name,
+                .device = device,
+                .context = context,
+                .cont = cont,
+        };
+
+        ret = kernel_thread(request_firmware_work_func, fw_work,
+                            CLONE_FS | CLONE_FILES);
+
+        if (ret < 0) {
+                fw_work->cont(NULL, fw_work->context);
+                return ret;
+        }
+        return 0;
+}
+
+static int __init
+firmware_class_init(void)
+{
+        int error;
+        error = class_register(&firmware_class);
+        if (error) {
+                printk(KERN_ERR "%s: class_register failed\n", __FUNCTION__);
+                return error;
+        }
+        error = class_create_file(&firmware_class, &class_attr_timeout);
+        if (error) {
+                printk(KERN_ERR "%s: class_create_file failed\n",
+                       __FUNCTION__);
+                class_unregister(&firmware_class);
+        }
+        return error;
+
+}
+static void __exit
+firmware_class_exit(void)
+{
+        class_unregister(&firmware_class);
+}
+
+module_init(firmware_class_init);
+module_exit(firmware_class_exit);
+
+EXPORT_SYMBOL(release_firmware);
+EXPORT_SYMBOL(request_firmware);
+EXPORT_SYMBOL(request_firmware_nowait);
+EXPORT_SYMBOL(register_firmware);