From: Sean Wang <[email protected]>
v8 and changes since v7:
- add updates per these suggestions mentioned in [1][2]
- remove the hack atomic_inc(&hdev->cmd_cnt) mentioned in [2] because it should
be better to be considered in the core
[1] http://lists.infradead.org/pipermail/linux-mediatek/2018-August/014516.html
[2] http://lists.infradead.org/pipermail/linux-mediatek/2018-August/014518.html
v7 and changes since v6:
- drop already applied patches
- move clk_* and pm_* operation to ->open and ->close
- label this driver as BT_MTKUART
- make code style aligned with the other drivers and code better to read
as these suggestions and fixes are mentioned in [1]
[1] http://lists.infradead.org/pipermail/linux-mediatek/2018-July/014458.html
v6 and changes since v5:
- make btmtkuart become a separate driver.
- drop already applied patches and the patch for btuart driver
- refine comments in driver allowing people know that mtk extra header
+ length doesn't indicate a full H:4 frame, things can fragment.
- enhance dt-binding document with removing mistaken added " and improve
English sentence.
- remove unnecessary '\n' with bt_dev_err.
- refine code style.
- set hdev->manufacturer as mtk id.
v5 and changes since v4:
- add Reviewed-by Tag from Ulf Hansson for patch 2
- remove default y in Kconfig for btmtkuart selection to avoid overkill for
users which would like to have less an amount on stuff in kernel.
- list header declarations in alphabetical order and add a proper blank line
within.
- remove unused macro.
- use sizeof to calculate structure size instead of an aextra macro to hardcode.
- use struct hci_dev * as input paraments for mtk_hci_wmt_sync and mtk_setup_fw
for that can be reused in mtk bluetooth with other interfaces.
- remove unused local variabled in mtk_btuart_recv.
- remove superfluous :8 for dlen2 in struct mtk_stp_hdr definition.
- give a reasonable naming for these labels and add a pm_runtime_put_noidle()
in the path undoing failing pm_runtime_get_sync().
- Turn __u8 into u8 in struct mtk_stp_hdr.
Really thanks for these reviews by Johan Hovold and Andy Shevchenko
v4 and changes since v3:
- refine patch 2 based on commit 919b7308fcc4 to allow that
dev_pm_domain_attach() will return better error codes.
v3 and changes since v2
* all changes happen on patch 6
- fix up SPDX license style for btmtkuart.h.
- change firmware download from in ACL data to in HCI commands
and then remove unused mtk_acl_wmt_sync and related code.
- add a workaround replacing bad vendor event id 0xe4 with 0xff every
vendor should use.
- add a sanity check for mtk_hci_wmt_sync to verifying if
input parameters are valid.
- add an atomic_inc(&bdev->hdev->cmd_cnt) for __hci_cmd_sync_ev.
- be changed to use firmware with a header called mt7622pr2h.bin.
v2 and changes since v1
- Dropped patches already being applied
- Rewirte the whole driver using btuart [1], and add slight extension
of btuart to fit into btmtkuart driver. Beware that [1] is also pulled
into one part of the series for avoiding any breakage when the patchset
is being compiled.
[1] btuart
https://www.spinics.net/lists/linux-bluetooth/msg74918.html
v1:
Hi,
This patchset introduces built-in Bluetooth support on MT7622 SoC.
And, it should be simple to make an extension to support other
MediaTek SoCs with adjusting a few of changes on the initialization
sequence of the device.
Before the main driver is being introduced, a few of things about
power-domain management should be re-worked for serdev core and MediaTek
SCPSYS to allow the Bluetooth to properly power up.
Patch 2: add a generic way attaching power domain to serdev
Patch 3 and 4: add cleanups with reuse APIs from Linux core
Patch 5: fix a limitation about power enablement Bluetooth depends on
Patch 1, 6 and 7: the major part of adding Bluetooth support to MT7622
Sean
Sean Wang (3):
dt-bindings: net: bluetooth: Add mediatek-bluetooth
Bluetooth: mediatek: Add protocol support for MediaTek serial devices
MAINTAINERS: add an entry for MediaTek Bluetooth driver
.../devicetree/bindings/net/mediatek-bluetooth.txt | 35 ++
MAINTAINERS | 8 +
drivers/bluetooth/Kconfig | 11 +
drivers/bluetooth/Makefile | 2 +
drivers/bluetooth/btmtkuart.c | 588 +++++++++++++++++++++
5 files changed, 644 insertions(+)
create mode 100644 Documentation/devicetree/bindings/net/mediatek-bluetooth.txt
create mode 100644 drivers/bluetooth/btmtkuart.c
--
2.7.4
From: Sean Wang <[email protected]>
Add an entry for the MediaTek Bluetooth driver.
Signed-off-by: Sean Wang <[email protected]>
---
MAINTAINERS | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/MAINTAINERS b/MAINTAINERS
index 0f2cce4..e983d9e 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -9144,6 +9144,14 @@ F: include/uapi/linux/meye.h
F: include/uapi/linux/ivtv*
F: include/uapi/linux/uvcvideo.h
+MEDIATEK BLUETOOTH DRIVER
+M: Sean Wang <[email protected]>
+L: [email protected]
+L: [email protected] (moderated for non-subscribers)
+S: Maintained
+F: Documentation/devicetree/bindings/net/mediatek-bluetooth.txt
+F: drivers/bluetooth/btmtkuart.c
+
MEDIATEK CIR DRIVER
M: Sean Wang <[email protected]>
S: Maintained
--
2.7.4
From: Sean Wang <[email protected]>
This adds a driver based on serdev driver for the MediaTek serial protocol
based on running H:4, which can enable the built-in Bluetooth device inside
MT7622 SoC.
Signed-off-by: Sean Wang <[email protected]>
---
drivers/bluetooth/Kconfig | 11 +
drivers/bluetooth/Makefile | 2 +
drivers/bluetooth/btmtkuart.c | 588 ++++++++++++++++++++++++++++++++++++++++++
3 files changed, 601 insertions(+)
create mode 100644 drivers/bluetooth/btmtkuart.c
diff --git a/drivers/bluetooth/Kconfig b/drivers/bluetooth/Kconfig
index f3c643a..5ace676 100644
--- a/drivers/bluetooth/Kconfig
+++ b/drivers/bluetooth/Kconfig
@@ -74,6 +74,17 @@ config BT_HCIBTSDIO
Say Y here to compile support for Bluetooth SDIO devices into the
kernel or say M to compile it as module (btsdio).
+config BT_MTKUART
+ tristate "MediaTek HCI UART driver"
+ depends on SERIAL_DEV_BUS
+ help
+ MediaTek Bluetooth HCI UART driver.
+ This driver is required if you want to use MediaTek Bluetooth
+ with serial interface.
+
+ Say Y here to compile support for MediaTek Bluetooth UART devices
+ into the kernel or say M to compile it as module (btmtkuart).
+
config BT_HCIUART
tristate "HCI UART driver"
depends on SERIAL_DEV_BUS || !SERIAL_DEV_BUS
diff --git a/drivers/bluetooth/Makefile b/drivers/bluetooth/Makefile
index ec16c55..12ad6e9 100644
--- a/drivers/bluetooth/Makefile
+++ b/drivers/bluetooth/Makefile
@@ -25,6 +25,8 @@ obj-$(CONFIG_BT_BCM) += btbcm.o
obj-$(CONFIG_BT_RTL) += btrtl.o
obj-$(CONFIG_BT_QCA) += btqca.o
+obj-$(CONFIG_BT_MTKUART) += btmtkuart.o
+
obj-$(CONFIG_BT_HCIUART_NOKIA) += hci_nokia.o
obj-$(CONFIG_BT_HCIRSI) += btrsi.o
diff --git a/drivers/bluetooth/btmtkuart.c b/drivers/bluetooth/btmtkuart.c
new file mode 100644
index 0000000..8ec7568
--- /dev/null
+++ b/drivers/bluetooth/btmtkuart.c
@@ -0,0 +1,588 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (c) 2018 MediaTek Inc.
+
+/*
+ * Bluetooth support for MediaTek serial devices
+ *
+ * Author: Sean Wang <[email protected]>
+ *
+ */
+
+#include <asm/unaligned.h>
+#include <linux/atomic.h>
+#include <linux/clk.h>
+#include <linux/firmware.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/pm_runtime.h>
+#include <linux/serdev.h>
+#include <linux/skbuff.h>
+
+#include <net/bluetooth/bluetooth.h>
+#include <net/bluetooth/hci_core.h>
+
+#include "h4_recv.h"
+
+#define VERSION "0.1"
+
+#define FIRMWARE_MT7622 "mediatek/mt7622pr2h.bin"
+
+#define MTK_STP_TLR_SIZE 2
+
+#define BTMTKUART_TX_STATE_ACTIVE 1
+#define BTMTKUART_TX_STATE_WAKEUP 2
+
+enum {
+ MTK_WMT_PATCH_DWNLD = 0x1,
+ MTK_WMT_FUNC_CTRL = 0x6,
+ MTK_WMT_RST = 0x7
+};
+
+struct mtk_stp_hdr {
+ u8 prefix;
+ u8 dlen1;
+ u8 dlen2;
+ u8 cs;
+} __packed;
+
+struct mtk_wmt_hdr {
+ u8 dir;
+ u8 op;
+ __le16 dlen;
+ u8 flag;
+} __packed;
+
+struct mtk_hci_wmt_cmd {
+ struct mtk_wmt_hdr hdr;
+ u8 data[256];
+} __packed;
+
+struct btmtkuart_dev {
+ struct hci_dev *hdev;
+ struct serdev_device *serdev;
+ struct clk *clk;
+
+ struct work_struct tx_work;
+ unsigned long tx_state;
+ struct sk_buff_head txq;
+
+ struct sk_buff *rx_skb;
+
+ u8 stp_pad[6];
+ u8 stp_cursor;
+ u16 stp_dlen;
+};
+
+static int mtk_hci_wmt_sync(struct hci_dev *hdev, u8 op, u8 flag, u16 plen,
+ const void *param)
+{
+ struct mtk_hci_wmt_cmd wc;
+ struct mtk_wmt_hdr *hdr;
+ struct sk_buff *skb;
+ u32 hlen;
+
+ hlen = sizeof(*hdr) + plen;
+ if (hlen > 255)
+ return -EINVAL;
+
+ hdr = (struct mtk_wmt_hdr *)&wc;
+ hdr->dir = 1;
+ hdr->op = op;
+ hdr->dlen = cpu_to_le16(plen + 1);
+ hdr->flag = flag;
+ memcpy(wc.data, param, plen);
+
+ skb = __hci_cmd_sync_ev(hdev, 0xfc6f, hlen, &wc, HCI_VENDOR_PKT,
+ HCI_INIT_TIMEOUT);
+
+ if (IS_ERR(skb)) {
+ int err = PTR_ERR(skb);
+
+ bt_dev_err(hdev, "Failed to send wmt cmd (%d)", err);
+ return err;
+ }
+
+ kfree_skb(skb);
+
+ return 0;
+}
+
+static int mtk_setup_fw(struct hci_dev *hdev)
+{
+ const struct firmware *fw;
+ const u8 *fw_ptr;
+ size_t fw_size;
+ int err, dlen;
+ u8 flag;
+
+ err = request_firmware(&fw, FIRMWARE_MT7622, &hdev->dev);
+ if (err < 0) {
+ bt_dev_err(hdev, "Failed to load firmware file (%d)", err);
+ return err;
+ }
+
+ fw_ptr = fw->data;
+ fw_size = fw->size;
+
+ /* The size of patch header is 30 bytes, should be skip. */
+ if (fw_size < 30)
+ return -EINVAL;
+
+ fw_size -= 30;
+ fw_ptr += 30;
+ flag = 1;
+
+ while (fw_size > 0) {
+ dlen = min_t(int, 250, fw_size);
+
+ /* Tell deivice the position in sequence. */
+ if (fw_size - dlen <= 0)
+ flag = 3;
+ else if (fw_size < fw->size - 30)
+ flag = 2;
+
+ err = mtk_hci_wmt_sync(hdev, MTK_WMT_PATCH_DWNLD, flag, dlen,
+ fw_ptr);
+ if (err < 0)
+ break;
+
+ fw_size -= dlen;
+ fw_ptr += dlen;
+ }
+
+ release_firmware(fw);
+
+ return err;
+}
+
+static int btmtkuart_recv_event(struct hci_dev *hdev, struct sk_buff *skb)
+{
+ struct hci_event_hdr *hdr = (void *)skb->data;
+
+ /* Fix up the vendor event id with HCI_VENDOR_PKT instead of
+ * 0xe4 so that btmon can parse the kind of vendor event properly.
+ */
+ if (hdr->evt == 0xe4)
+ hdr->evt = HCI_VENDOR_PKT;
+
+ return hci_recv_frame(hdev, skb);
+}
+
+static const struct h4_recv_pkt mtk_recv_pkts[] = {
+ { H4_RECV_ACL, .recv = hci_recv_frame },
+ { H4_RECV_SCO, .recv = hci_recv_frame },
+ { H4_RECV_EVENT, .recv = btmtkuart_recv_event },
+};
+
+static void btmtkuart_tx_work(struct work_struct *work)
+{
+ struct btmtkuart_dev *bdev = container_of(work, struct btmtkuart_dev,
+ tx_work);
+ struct serdev_device *serdev = bdev->serdev;
+ struct hci_dev *hdev = bdev->hdev;
+
+ while (1) {
+ clear_bit(BTMTKUART_TX_STATE_WAKEUP, &bdev->tx_state);
+
+ while (1) {
+ struct sk_buff *skb = skb_dequeue(&bdev->txq);
+ int len;
+
+ if (!skb)
+ break;
+
+ len = serdev_device_write_buf(serdev, skb->data,
+ skb->len);
+ hdev->stat.byte_tx += len;
+
+ skb_pull(skb, len);
+ if (skb->len > 0) {
+ skb_queue_head(&bdev->txq, skb);
+ break;
+ }
+
+ switch (hci_skb_pkt_type(skb)) {
+ case HCI_COMMAND_PKT:
+ hdev->stat.cmd_tx++;
+ break;
+ case HCI_ACLDATA_PKT:
+ hdev->stat.acl_tx++;
+ break;
+ case HCI_SCODATA_PKT:
+ hdev->stat.sco_tx++;
+ break;
+ }
+
+ kfree_skb(skb);
+ }
+
+ if (!test_bit(BTMTKUART_TX_STATE_WAKEUP, &bdev->tx_state))
+ break;
+ }
+
+ clear_bit(BTMTKUART_TX_STATE_ACTIVE, &bdev->tx_state);
+}
+
+static void btmtkuart_tx_wakeup(struct btmtkuart_dev *bdev)
+{
+ if (test_and_set_bit(BTMTKUART_TX_STATE_ACTIVE, &bdev->tx_state))
+ set_bit(BTMTKUART_TX_STATE_WAKEUP, &bdev->tx_state);
+
+ schedule_work(&bdev->tx_work);
+}
+
+static const unsigned char *
+mtk_stp_split(struct btmtkuart_dev *bdev, const unsigned char *data, int count,
+ int *sz_h4)
+{
+ struct mtk_stp_hdr *shdr;
+
+ /* The cursor is reset when all the data of STP is consumed out. */
+ if (!bdev->stp_dlen && bdev->stp_cursor >= 6)
+ bdev->stp_cursor = 0;
+
+ /* Filling pad until all STP info is obtained. */
+ while (bdev->stp_cursor < 6 && count > 0) {
+ bdev->stp_pad[bdev->stp_cursor] = *data;
+ bdev->stp_cursor++;
+ data++;
+ count--;
+ }
+
+ /* Retrieve STP info and have a sanity check. */
+ if (!bdev->stp_dlen && bdev->stp_cursor >= 6) {
+ shdr = (struct mtk_stp_hdr *)&bdev->stp_pad[2];
+ bdev->stp_dlen = (shdr->dlen1 & 0xf) << 8 | shdr->dlen2;
+
+ /* Resync STP when unexpected data is being read. */
+ if (shdr->prefix != 0x80 || bdev->stp_dlen > 2048) {
+ bt_dev_err(bdev->hdev, "stp format unexpect (%d, %d)",
+ shdr->prefix, bdev->stp_dlen);
+ bdev->stp_cursor = 2;
+ bdev->stp_dlen = 0;
+ }
+ }
+
+ /* Directly quit when there's no data found for H4 can process. */
+ if (count <= 0)
+ return NULL;
+
+ /* Tranlate to how much the size of data H4 can handle so far. */
+ *sz_h4 = min_t(int, count, bdev->stp_dlen);
+
+ /* Update the remaining size of STP packet. */
+ bdev->stp_dlen -= *sz_h4;
+
+ /* Data points to STP payload which can be handled by H4. */
+ return data;
+}
+
+static int btmtkuart_recv(struct hci_dev *hdev, const u8 *data, size_t count)
+{
+ struct btmtkuart_dev *bdev = hci_get_drvdata(hdev);
+ const unsigned char *p_left = data, *p_h4;
+ int sz_left = count, sz_h4, adv;
+ int err;
+
+ while (sz_left > 0) {
+ /* The serial data received from MT7622 BT controller is
+ * at all time padded around with the STP header and tailer.
+ *
+ * A full STP packet is looking like
+ * -----------------------------------
+ * | STP header | H:4 | STP tailer |
+ * -----------------------------------
+ * but it doesn't guarantee to contain a full H:4 packet which
+ * means that it's possible for multiple STP packets forms a
+ * full H:4 packet that means extra STP header + length doesn't
+ * indicate a full H:4 frame, things can fragment. Whose length
+ * recorded in STP header just shows up the most length the
+ * H:4 engine can handle currently.
+ */
+
+ p_h4 = mtk_stp_split(bdev, p_left, sz_left, &sz_h4);
+ if (!p_h4)
+ break;
+
+ adv = p_h4 - p_left;
+ sz_left -= adv;
+ p_left += adv;
+
+ bdev->rx_skb = h4_recv_buf(bdev->hdev, bdev->rx_skb, p_h4,
+ sz_h4, mtk_recv_pkts,
+ sizeof(mtk_recv_pkts));
+ if (IS_ERR(bdev->rx_skb)) {
+ err = PTR_ERR(bdev->rx_skb);
+ bt_dev_err(bdev->hdev,
+ "Frame reassembly failed (%d)", err);
+ bdev->rx_skb = NULL;
+ return err;
+ }
+
+ sz_left -= sz_h4;
+ p_left += sz_h4;
+ }
+
+ return 0;
+}
+
+static int btmtkuart_receive_buf(struct serdev_device *serdev, const u8 *data,
+ size_t count)
+{
+ struct btmtkuart_dev *bdev = serdev_device_get_drvdata(serdev);
+ int err;
+
+ err = btmtkuart_recv(bdev->hdev, data, count);
+ if (err < 0)
+ return err;
+
+ bdev->hdev->stat.byte_rx += count;
+
+ return count;
+}
+
+static void btmtkuart_write_wakeup(struct serdev_device *serdev)
+{
+ struct btmtkuart_dev *bdev = serdev_device_get_drvdata(serdev);
+
+ btmtkuart_tx_wakeup(bdev);
+}
+
+static const struct serdev_device_ops btmtkuart_client_ops = {
+ .receive_buf = btmtkuart_receive_buf,
+ .write_wakeup = btmtkuart_write_wakeup,
+};
+
+static int btmtkuart_open(struct hci_dev *hdev)
+{
+ struct btmtkuart_dev *bdev = hci_get_drvdata(hdev);
+ struct device *dev;
+ int err;
+
+ err = serdev_device_open(bdev->serdev);
+ if (err) {
+ bt_dev_err(hdev, "Unable to open UART device %s",
+ dev_name(&bdev->serdev->dev));
+ goto err_open;
+ }
+
+ dev = &bdev->serdev->dev;
+
+ bdev->stp_cursor = 2;
+ bdev->stp_dlen = 0;
+
+ /* Enable the power domain and clock the device requires. */
+ pm_runtime_enable(dev);
+ err = pm_runtime_get_sync(dev);
+ if (err < 0) {
+ pm_runtime_put_noidle(dev);
+ goto err_disable_rpm;
+ }
+
+ err = clk_prepare_enable(bdev->clk);
+ if (err < 0)
+ goto err_put_rpm;
+
+ return 0;
+
+err_put_rpm:
+ pm_runtime_put_sync(dev);
+err_disable_rpm:
+ pm_runtime_disable(dev);
+err_open:
+ return err;
+}
+
+static int btmtkuart_close(struct hci_dev *hdev)
+{
+ struct btmtkuart_dev *bdev = hci_get_drvdata(hdev);
+ struct device *dev = &bdev->serdev->dev;
+
+ /* Shutdown the clock and power domain the device requires. */
+ clk_disable_unprepare(bdev->clk);
+ pm_runtime_put_sync(dev);
+ pm_runtime_disable(dev);
+
+ serdev_device_close(bdev->serdev);
+
+ return 0;
+}
+
+static int btmtkuart_flush(struct hci_dev *hdev)
+{
+ struct btmtkuart_dev *bdev = hci_get_drvdata(hdev);
+
+ /* Flush any pending characters */
+ serdev_device_write_flush(bdev->serdev);
+ skb_queue_purge(&bdev->txq);
+
+ cancel_work_sync(&bdev->tx_work);
+
+ kfree_skb(bdev->rx_skb);
+ bdev->rx_skb = NULL;
+ bdev->stp_cursor = 2;
+ bdev->stp_dlen = 0;
+
+ return 0;
+}
+
+static int btmtkuart_setup(struct hci_dev *hdev)
+{
+ u8 param = 0x1;
+ int err = 0;
+
+ /* Setup a firmware which the device definitely requires. */
+ err = mtk_setup_fw(hdev);
+ if (err < 0)
+ return err;
+
+ /* Activate funciton the firmware providing to. */
+ err = mtk_hci_wmt_sync(hdev, MTK_WMT_RST, 0x4, 0, 0);
+ if (err < 0)
+ return err;
+
+ /* Enable Bluetooth protocol. */
+ err = mtk_hci_wmt_sync(hdev, MTK_WMT_FUNC_CTRL, 0x0, sizeof(param),
+ ¶m);
+ if (err < 0)
+ return err;
+
+ return 0;
+}
+
+static int btmtkuart_shutdown(struct hci_dev *hdev)
+{
+ u8 param = 0x0;
+ int err;
+
+ /* Disable the device. */
+ err = mtk_hci_wmt_sync(hdev, MTK_WMT_FUNC_CTRL, 0x0, sizeof(param),
+ ¶m);
+
+ return err;
+}
+
+static int btmtkuart_send_frame(struct hci_dev *hdev, struct sk_buff *skb)
+{
+ struct btmtkuart_dev *bdev = hci_get_drvdata(hdev);
+ struct mtk_stp_hdr *shdr;
+ int err, dlen;
+ u8 *p;
+
+ /* Prepend skb with frame type */
+ memcpy(skb_push(skb, 1), &hci_skb_pkt_type(skb), 1);
+ dlen = skb->len;
+
+ /* Make sure that there is enough rooms for STP header and trailer */
+ if (unlikely(skb_headroom(skb) < sizeof(*shdr)) ||
+ (skb_tailroom(skb) < MTK_STP_TLR_SIZE)) {
+ err = pskb_expand_head(skb, sizeof(*shdr), MTK_STP_TLR_SIZE,
+ GFP_ATOMIC);
+ if (err < 0)
+ return err;
+ }
+
+ /* Add the STP header */
+ shdr = skb_push(skb, sizeof(*shdr));
+ p = (u8 *)shdr;
+ shdr->prefix = 0x80;
+ shdr->dlen1 = (dlen & 0xf00) >> 8;
+ shdr->dlen2 = dlen & 0xff;
+ /* MT7622 don't care the checksum value */
+ shdr->cs = 0;
+ /* Add the STP trailer */
+ skb_put_zero(skb, MTK_STP_TLR_SIZE);
+
+ skb_queue_tail(&bdev->txq, skb);
+
+ btmtkuart_tx_wakeup(bdev);
+ return 0;
+}
+
+static int btmtkuart_probe(struct serdev_device *serdev)
+{
+ struct btmtkuart_dev *bdev;
+ struct hci_dev *hdev;
+
+ bdev = devm_kzalloc(&serdev->dev, sizeof(*bdev), GFP_KERNEL);
+ if (!bdev)
+ return -ENOMEM;
+
+ bdev->clk = devm_clk_get(&serdev->dev, "ref");
+ if (IS_ERR(bdev->clk))
+ return PTR_ERR(bdev->clk);
+
+ bdev->serdev = serdev;
+ serdev_device_set_drvdata(serdev, bdev);
+
+ serdev_device_set_client_ops(serdev, &btmtkuart_client_ops);
+
+ INIT_WORK(&bdev->tx_work, btmtkuart_tx_work);
+ skb_queue_head_init(&bdev->txq);
+
+ /* Initialize and register HCI device */
+ hdev = hci_alloc_dev();
+ if (!hdev) {
+ dev_err(&serdev->dev, "Can't allocate HCI device\n");
+ return -ENOMEM;
+ }
+
+ bdev->hdev = hdev;
+
+ hdev->bus = HCI_UART;
+ hci_set_drvdata(hdev, bdev);
+
+ hdev->open = btmtkuart_open;
+ hdev->close = btmtkuart_close;
+ hdev->flush = btmtkuart_flush;
+ hdev->setup = btmtkuart_setup;
+ hdev->shutdown = btmtkuart_shutdown;
+ hdev->send = btmtkuart_send_frame;
+ SET_HCIDEV_DEV(hdev, &serdev->dev);
+
+ hdev->manufacturer = 70;
+ set_bit(HCI_QUIRK_NON_PERSISTENT_SETUP, &hdev->quirks);
+
+ if (hci_register_dev(hdev) < 0) {
+ dev_err(&serdev->dev, "Can't register HCI device\n");
+ hci_free_dev(hdev);
+ return -ENODEV;
+ }
+
+ return 0;
+}
+
+static void btmtkuart_remove(struct serdev_device *serdev)
+{
+ struct btmtkuart_dev *bdev = serdev_device_get_drvdata(serdev);
+ struct hci_dev *hdev = bdev->hdev;
+
+ hci_unregister_dev(hdev);
+ hci_free_dev(hdev);
+}
+
+#ifdef CONFIG_OF
+static const struct of_device_id mtk_of_match_table[] = {
+ { .compatible = "mediatek,mt7622-bluetooth"},
+ { }
+};
+MODULE_DEVICE_TABLE(of, mtk_of_match_table);
+#endif
+
+static struct serdev_device_driver btmtkuart_driver = {
+ .probe = btmtkuart_probe,
+ .remove = btmtkuart_remove,
+ .driver = {
+ .name = "btmtkuart",
+ .of_match_table = of_match_ptr(mtk_of_match_table),
+ },
+};
+
+module_serdev_device_driver(btmtkuart_driver);
+
+MODULE_AUTHOR("Sean Wang <[email protected]>");
+MODULE_DESCRIPTION("MediaTek Bluetooth Serial driver ver " VERSION);
+MODULE_VERSION(VERSION);
+MODULE_LICENSE("GPL");
+MODULE_FIRMWARE(FIRMWARE_MT7622);
--
2.7.4
From: Sean Wang <[email protected]>
Add binding document for a SoC built-in device using MediaTek protocol.
Which could be found on MT7622 SoC or other similar MediaTek SoCs.
Signed-off-by: Sean Wang <[email protected]>
Reviewed-by: Rob Herring <[email protected]>
---
.../devicetree/bindings/net/mediatek-bluetooth.txt | 35 ++++++++++++++++++++++
1 file changed, 35 insertions(+)
create mode 100644 Documentation/devicetree/bindings/net/mediatek-bluetooth.txt
diff --git a/Documentation/devicetree/bindings/net/mediatek-bluetooth.txt b/Documentation/devicetree/bindings/net/mediatek-bluetooth.txt
new file mode 100644
index 0000000..14ceb2a
--- /dev/null
+++ b/Documentation/devicetree/bindings/net/mediatek-bluetooth.txt
@@ -0,0 +1,35 @@
+MediaTek SoC built-in Bluetooth Devices
+==================================
+
+This device is a serial attached device to BTIF device and thus it must be a
+child node of the serial node with BTIF. The dt-bindings details for BTIF
+device can be known via Documentation/devicetree/bindings/serial/8250.txt.
+
+Required properties:
+
+- compatible: Must be
+ "mediatek,mt7622-bluetooth": for MT7622 SoC
+- clocks: Should be the clock specifiers corresponding to the entry in
+ clock-names property.
+- clock-names: Should contain "ref" entries.
+- power-domains: Phandle to the power domain that the device is part of
+
+Example:
+
+ btif: serial@1100c000 {
+ compatible = "mediatek,mt7622-btif",
+ "mediatek,mtk-btif";
+ reg = <0 0x1100c000 0 0x1000>;
+ interrupts = <GIC_SPI 90 IRQ_TYPE_LEVEL_LOW>;
+ clocks = <&pericfg CLK_PERI_BTIF_PD>;
+ clock-names = "main";
+ reg-shift = <2>;
+ reg-io-width = <4>;
+
+ bluetooth {
+ compatible = "mediatek,mt7622-bluetooth";
+ power-domains = <&scpsys MT7622_POWER_DOMAIN_WB>;
+ clocks = <&clk25m>;
+ clock-names = "ref";
+ };
+ };
--
2.7.4