There are provedly different firmware variants for the different
phones using some of these chips. These were extracted from a few
Samsung phones:
37446 BCM4334B0.samsung,codina-tmo.hcd
37366 BCM4334B0.samsung,golden.hcd
37403 BCM4334B0.samsung,kyle.hcd
37366 BCM4334B0.samsung,skomer.hcd
This patch supports the above naming schedule with inserting
[.board_name] between the firmware name and ".hcd". This scheme
is the same as used by the companion BRCM wireless chips
as can be seen in
drivers/net/wireless/broadcom/brcm80211/brcmfmac/firmware.c
or just by looking at the firmwares in linux-firmware/brcm.
Currently we only support board variants using the device
tree compatible string as board type, but other schemes are
possible.
This makes it possible to successfully load a few unique
firmware variants for some Samsung phones.
Cc: phone-devel@xxxxxxxxxxxxxxx
Cc: Markuss Broks <markuss.broks@xxxxxxxxx>
Cc: Stephan Gerhold <stephan@xxxxxxxxxxx>
Signed-off-by: Linus Walleij <linus.walleij@xxxxxxxxxx>
---
ChangeLog v1->v2:
- Put the ifdeffery inside the btbcm_get_board_name()
function instead of having a separate function for the
else clause.
- Drop pointless NULL assignment to board_name
variable.
---
drivers/bluetooth/btbcm.c | 52 ++++++++++++++++++++++++++++++++++++++-
1 file changed, 51 insertions(+), 1 deletion(-)
diff --git a/drivers/bluetooth/btbcm.c b/drivers/bluetooth/btbcm.c
index d9ceca7a7935..92a2b7e81757 100644
--- a/drivers/bluetooth/btbcm.c
+++ b/drivers/bluetooth/btbcm.c
@@ -9,6 +9,7 @@
#include <linux/module.h>
#include <linux/firmware.h>
#include <linux/dmi.h>
+#include <linux/of.h>
#include <asm/unaligned.h>
#include <net/bluetooth/bluetooth.h>
@@ -29,7 +30,7 @@
#define BDADDR_BCM43341B (&(bdaddr_t) {{0xac, 0x1f, 0x00, 0x1b, 0x34, 0x43}})
#define BCM_FW_NAME_LEN 64
-#define BCM_FW_NAME_COUNT_MAX 2
+#define BCM_FW_NAME_COUNT_MAX 4
/* For kmalloc-ing the fw-name array instead of putting it on the stack */
typedef char bcm_fw_name[BCM_FW_NAME_LEN];
@@ -476,6 +477,42 @@ static const struct bcm_subver_table bcm_usb_subver_table[] = {
{ }
};
+/*
+ * This currently only looks up the device tree board appendix,
+ * but can be expanded to other mechanisms.
+ */
+static const char *btbcm_get_board_name(struct device *dev)
+{
+#ifdef CONFIG_OF
+ struct device_node *root;
+ char *board_type;
+ const char *tmp;
+ int len;
+ int i;
+
+ root = of_find_node_by_path("/");
+ if (!root)
+ return NULL;
+
+ if (of_property_read_string_index(root, "compatible", 0, &tmp))
+ return NULL;
+
+ /* get rid of any '/' in the compatible string */
+ len = strlen(tmp) + 1;
+ board_type = devm_kzalloc(dev, len, GFP_KERNEL);
+ strscpy(board_type, tmp, len);
+ for (i = 0; i < board_type[i]; i++) {
+ if (board_type[i] == '/')
+ board_type[i] = '-';
+ }
+ of_node_put(root);
+
+ return board_type;
+#else
+ return NULL;
+#endif
+}
+
int btbcm_initialize(struct hci_dev *hdev, bool *fw_load_done)
{
u16 subver, rev, pid, vid;
@@ -483,12 +520,15 @@ int btbcm_initialize(struct hci_dev *hdev, bool *fw_load_done)
struct hci_rp_read_local_version *ver;
const struct bcm_subver_table *bcm_subver_table;
const char *hw_name = NULL;
+ const char *board_name;
char postfix[16] = "";
int fw_name_count = 0;
bcm_fw_name *fw_name;
const struct firmware *fw;
int i, err;
+ board_name = btbcm_get_board_name(&hdev->dev);
+
/* Reset */
err = btbcm_reset(hdev);
if (err)
@@ -549,11 +589,21 @@ int btbcm_initialize(struct hci_dev *hdev, bool *fw_load_done)
return -ENOMEM;
if (hw_name) {
+ if (board_name) {
+ snprintf(fw_name[fw_name_count], BCM_FW_NAME_LEN,
+ "brcm/%s%s.%s.hcd", hw_name, postfix, board_name);
+ fw_name_count++;
+ }
snprintf(fw_name[fw_name_count], BCM_FW_NAME_LEN,
"brcm/%s%s.hcd", hw_name, postfix);
fw_name_count++;
}
+ if (board_name) {
+ snprintf(fw_name[fw_name_count], BCM_FW_NAME_LEN,
+ "brcm/BCM%s.%s.hcd", postfix, board_name);
+ fw_name_count++;
+ }
snprintf(fw_name[fw_name_count], BCM_FW_NAME_LEN,
"brcm/BCM%s.hcd", postfix);
fw_name_count++;
--
2.35.1
