Bluetooth: btmrvl: support sysfs initiated firmware coredump

Since commit 3c47d19ff4dc ("drivers: base: add coredump driver ops")
it is possible to initiate a device coredump from user-space. This
patch adds support for it in btmrvl_sdio adding the .coredump()
driver callback. This makes dump through debugfs obsolete so removing
it.

Signed-off-by: Arend van Spriel <[e-mail]>
Signed-off-by: Marcel Holtmann <[e-mail]>

drivers/bluetooth/btmrvl_debugfs.c

···
 	.llseek = default_llseek,
 };
 
-static ssize_t btmrvl_fwdump_write(struct file *file, const char __user *ubuf,
-				   size_t count, loff_t *ppos)
-{
-	struct btmrvl_private *priv = file->private_data;
-	char buf[16];
-	bool result;
-
-	memset(buf, 0, sizeof(buf));
-
-	if (copy_from_user(&buf, ubuf, min_t(size_t, sizeof(buf) - 1, count)))
-		return -EFAULT;
-
-	if (strtobool(buf, &result))
-		return -EINVAL;
-
-	if (!result)
-		return -EINVAL;
-
-	btmrvl_firmware_dump(priv);
-
-	return count;
-}
-
-static const struct file_operations btmrvl_fwdump_fops = {
-	.write	= btmrvl_fwdump_write,
-	.open	= simple_open,
-	.llseek = default_llseek,
-};
-
 void btmrvl_debugfs_init(struct hci_dev *hdev)
 {
 	struct btmrvl_private *priv = hci_get_drvdata(hdev);
···
 			    priv, &btmrvl_hscmd_fops);
 	debugfs_create_file("hscfgcmd", 0644, dbg->config_dir,
 			    priv, &btmrvl_hscfgcmd_fops);
-	debugfs_create_file("fw_dump", 0200, dbg->config_dir,
-			    priv, &btmrvl_fwdump_fops);
 
 	dbg->status_dir = debugfs_create_dir("status", hdev->debugfs);
 	debugfs_create_u8("curpsmode", 0444, dbg->status_dir,

drivers/bluetooth/btmrvl_drv.h

···
 				u8 *payload, u16 nb);
 	int (*hw_wakeup_firmware)(struct btmrvl_private *priv);
 	int (*hw_process_int_status)(struct btmrvl_private *priv);
-	void (*firmware_dump)(struct btmrvl_private *priv);
 	spinlock_t driver_lock;		/* spinlock used by driver */
 #ifdef CONFIG_DEBUG_FS
 	void *debugfs_data;
···
 int btmrvl_enable_ps(struct btmrvl_private *priv);
 int btmrvl_prepare_command(struct btmrvl_private *priv);
 int btmrvl_enable_hs(struct btmrvl_private *priv);
-void btmrvl_firmware_dump(struct btmrvl_private *priv);
 
 #ifdef CONFIG_DEBUG_FS
 void btmrvl_debugfs_init(struct hci_dev *hdev);

drivers/bluetooth/btmrvl_main.c

···
 	return ret;
 }
 
-void btmrvl_firmware_dump(struct btmrvl_private *priv)
-{
-	if (priv->firmware_dump)
-		priv->firmware_dump(priv);
-}
-
 static int btmrvl_tx_pkt(struct btmrvl_private *priv, struct sk_buff *skb)
 {
 	int ret = 0;

drivers/bluetooth/btmrvl_sdio.c

···
 }
 
 /* This function dump sdio register and memory data */
-static void btmrvl_sdio_dump_firmware(struct btmrvl_private *priv)
+static void btmrvl_sdio_coredump(struct device *dev)
 {
-	struct btmrvl_sdio_card *card = priv->btmrvl_dev.card;
+	struct sdio_func *func = dev_to_sdio_func(dev);
+	struct btmrvl_sdio_card *card;
+	struct btmrvl_private *priv;
 	int ret = 0;
 	unsigned int reg, reg_start, reg_end;
 	enum rdwr_status stat;
 	u8 *dbg_ptr, *end_ptr, *fw_dump_data, *fw_dump_ptr;
 	u8 dump_num = 0, idx, i, read_reg, doneflag = 0;
 	u32 memory_size, fw_dump_len = 0;
+
+	card = sdio_get_drvdata(func);
+	priv = card->priv;
 
 	/* dump sdio register first */
 	btmrvl_sdio_dump_regs(priv);
···
 	priv->hw_host_to_card = btmrvl_sdio_host_to_card;
 	priv->hw_wakeup_firmware = btmrvl_sdio_wakeup_fw;
 	priv->hw_process_int_status = btmrvl_sdio_process_int_status;
-	priv->firmware_dump = btmrvl_sdio_dump_firmware;
 
 	if (btmrvl_register_hdev(priv)) {
 		BT_ERR("Register hdev failed!");
···
 	.remove		= btmrvl_sdio_remove,
 	.drv = {
 		.owner = THIS_MODULE,
+		.coredump = btmrvl_sdio_coredump,
 		.pm = &btmrvl_sdio_pm_ops,
 	}
 };