diff options
Diffstat (limited to 'drivers/bluetooth/hci_ll.c')
| -rw-r--r-- | drivers/bluetooth/hci_ll.c | 261 |
1 files changed, 260 insertions, 1 deletions
diff --git a/drivers/bluetooth/hci_ll.c b/drivers/bluetooth/hci_ll.c index 02692fe..adc444f 100644 --- a/drivers/bluetooth/hci_ll.c +++ b/drivers/bluetooth/hci_ll.c @@ -34,20 +34,24 @@ #include <linux/sched.h> #include <linux/types.h> #include <linux/fcntl.h> +#include <linux/firmware.h> #include <linux/interrupt.h> #include <linux/ptrace.h> #include <linux/poll.h> #include <linux/slab.h> -#include <linux/tty.h> #include <linux/errno.h> #include <linux/string.h> #include <linux/signal.h> #include <linux/ioctl.h> +#include <linux/of.h> +#include <linux/serdev.h> #include <linux/skbuff.h> +#include <linux/ti_wilink_st.h> #include <net/bluetooth/bluetooth.h> #include <net/bluetooth/hci_core.h> +#include <linux/gpio/consumer.h> #include "hci_uart.h" @@ -76,6 +80,12 @@ struct hcill_cmd { u8 cmd; } __packed; +struct ll_device { + struct hci_uart hu; + struct serdev_device *serdev; + struct gpio_desc *enable_gpio; +}; + struct ll_struct { unsigned long rx_state; unsigned long rx_count; @@ -136,6 +146,9 @@ static int ll_open(struct hci_uart *hu) hu->priv = ll; + if (hu->serdev) + serdev_device_open(hu->serdev); + return 0; } @@ -164,6 +177,13 @@ static int ll_close(struct hci_uart *hu) kfree_skb(ll->rx_skb); + if (hu->serdev) { + struct ll_device *lldev = serdev_device_get_drvdata(hu->serdev); + gpiod_set_value_cansleep(lldev->enable_gpio, 0); + + serdev_device_close(hu->serdev); + } + hu->priv = NULL; kfree(ll); @@ -505,9 +525,244 @@ static struct sk_buff *ll_dequeue(struct hci_uart *hu) return skb_dequeue(&ll->txq); } +#if IS_ENABLED(CONFIG_SERIAL_DEV_BUS) +static int read_local_version(struct hci_dev *hdev) +{ + int err = 0; + unsigned short version = 0; + struct sk_buff *skb; + struct hci_rp_read_local_version *ver; + + skb = __hci_cmd_sync(hdev, HCI_OP_READ_LOCAL_VERSION, 0, NULL, HCI_INIT_TIMEOUT); + if (IS_ERR(skb)) { + bt_dev_err(hdev, "Reading TI version information failed (%ld)", + PTR_ERR(skb)); + return PTR_ERR(skb); + } + if (skb->len != sizeof(*ver)) { + err = -EILSEQ; + goto out; + } + + ver = (struct hci_rp_read_local_version *)skb->data; + if (le16_to_cpu(ver->manufacturer) != 13) { + err = -ENODEV; + goto out; + } + + version = le16_to_cpu(ver->lmp_subver); + +out: + if (err) bt_dev_err(hdev, "Failed to read TI version info: %d", err); + kfree_skb(skb); + return err ? err : version; +} + +/** + * download_firmware - + * internal function which parses through the .bts firmware + * script file intreprets SEND, DELAY actions only as of now + */ +static int download_firmware(struct ll_device *lldev) +{ + unsigned short chip, min_ver, maj_ver; + int version, err, len; + unsigned char *ptr, *action_ptr; + unsigned char bts_scr_name[40]; /* 40 char long bts scr name? */ + const struct firmware *fw; + struct sk_buff *skb; + struct hci_command *cmd; + + version = read_local_version(lldev->hu.hdev); + if (version < 0) + return version; + + chip = (version & 0x7C00) >> 10; + min_ver = (version & 0x007F); + maj_ver = (version & 0x0380) >> 7; + if (version & 0x8000) + maj_ver |= 0x0008; + + snprintf(bts_scr_name, sizeof(bts_scr_name), + "ti-connectivity/TIInit_%d.%d.%d.bts", + chip, maj_ver, min_ver); + + err = request_firmware(&fw, bts_scr_name, &lldev->serdev->dev); + if (err || !fw->data || !fw->size) { + bt_dev_err(lldev->hu.hdev, "request_firmware failed(errno %d) for %s", + err, bts_scr_name); + return -EINVAL; + } + ptr = (void *)fw->data; + len = fw->size; + /* bts_header to remove out magic number and + * version + */ + ptr += sizeof(struct bts_header); + len -= sizeof(struct bts_header); + + while (len > 0 && ptr) { + bt_dev_dbg(lldev->hu.hdev, " action size %d, type %d ", + ((struct bts_action *)ptr)->size, + ((struct bts_action *)ptr)->type); + + action_ptr = &(((struct bts_action *)ptr)->data[0]); + + switch (((struct bts_action *)ptr)->type) { + case ACTION_SEND_COMMAND: /* action send */ + bt_dev_dbg(lldev->hu.hdev, "S"); + cmd = (struct hci_command *)action_ptr; + if (cmd->opcode == 0xff36) { + /* ignore remote change + * baud rate HCI VS command */ + bt_dev_warn(lldev->hu.hdev, "change remote baud rate command in firmware"); + break; + } + if (cmd->prefix != 1) + bt_dev_dbg(lldev->hu.hdev, "command type %d\n", cmd->prefix); + + skb = __hci_cmd_sync(lldev->hu.hdev, cmd->opcode, cmd->plen, &cmd->speed, HCI_INIT_TIMEOUT); + if (IS_ERR(skb)) { + bt_dev_err(lldev->hu.hdev, "send command failed\n"); + goto out_rel_fw; + } + kfree_skb(skb); + break; + case ACTION_WAIT_EVENT: /* wait */ + /* no need to wait as command was synchronous */ + bt_dev_dbg(lldev->hu.hdev, "W"); + break; + case ACTION_DELAY: /* sleep */ + bt_dev_info(lldev->hu.hdev, "sleep command in scr"); + mdelay(((struct bts_action_delay *)action_ptr)->msec); + break; + } + len -= (sizeof(struct bts_action) + + ((struct bts_action *)ptr)->size); + ptr += sizeof(struct bts_action) + + ((struct bts_action *)ptr)->size; + } + +out_rel_fw: + /* fw download complete */ + release_firmware(fw); + return err; +} + +static int ll_setup(struct hci_uart *hu) +{ + int err, retry = 3; + struct ll_device *lldev; + struct serdev_device *serdev = hu->serdev; + u32 speed; + + if (!serdev) + return 0; + + lldev = serdev_device_get_drvdata(serdev); + + serdev_device_set_flow_control(serdev, true); + + do { + /* Configure BT_EN to HIGH state */ + gpiod_set_value_cansleep(lldev->enable_gpio, 0); + msleep(5); + gpiod_set_value_cansleep(lldev->enable_gpio, 1); + msleep(100); + + err = download_firmware(lldev); + if (!err) + break; + + /* Toggle BT_EN and retry */ + bt_dev_err(hu->hdev, "download firmware failed, retrying..."); + } while (retry--); + + if (err) + return err; + + /* Operational speed if any */ + if (hu->oper_speed) + speed = hu->oper_speed; + else if (hu->proto->oper_speed) + speed = hu->proto->oper_speed; + else + speed = 0; + + if (speed) { + struct sk_buff *skb = __hci_cmd_sync(hu->hdev, 0xff36, sizeof(speed), &speed, HCI_INIT_TIMEOUT); + if (!IS_ERR(skb)) { + kfree_skb(skb); + serdev_device_set_baudrate(serdev, speed); + } + } + + return 0; +} + +static const struct hci_uart_proto llp; + +static int hci_ti_probe(struct serdev_device *serdev) +{ + struct hci_uart *hu; + struct ll_device *lldev; + u32 max_speed = 3000000; + + lldev = devm_kzalloc(&serdev->dev, sizeof(struct ll_device), GFP_KERNEL); + if (!lldev) + return -ENOMEM; + hu = &lldev->hu; + + serdev_device_set_drvdata(serdev, lldev); + lldev->serdev = hu->serdev = serdev; + + lldev->enable_gpio = devm_gpiod_get_optional(&serdev->dev, "enable", GPIOD_OUT_LOW); + if (IS_ERR(lldev->enable_gpio)) + return PTR_ERR(lldev->enable_gpio); + + of_property_read_u32(serdev->dev.of_node, "max-speed", &max_speed); + hci_uart_set_speeds(hu, 115200, max_speed); + + return hci_uart_register_device(hu, &llp); +} + +static void hci_ti_remove(struct serdev_device *serdev) +{ + struct ll_device *lldev = serdev_device_get_drvdata(serdev); + struct hci_uart *hu = &lldev->hu; + struct hci_dev *hdev = hu->hdev; + + cancel_work_sync(&hu->write_work); + + hci_unregister_dev(hdev); + hci_free_dev(hdev); + hu->proto->close(hu); +} + +static const struct of_device_id hci_ti_of_match[] = { + { .compatible = "ti,wl1831-st" }, + { .compatible = "ti,wl1835-st" }, + { .compatible = "ti,wl1837-st" }, + {}, +}; +MODULE_DEVICE_TABLE(of, hci_ti_of_match); + +static struct serdev_device_driver hci_ti_drv = { + .driver = { + .name = "hci-ti", + .of_match_table = of_match_ptr(hci_ti_of_match), + }, + .probe = hci_ti_probe, + .remove = hci_ti_remove, +}; +#else +#define ll_setup NULL +#endif + static const struct hci_uart_proto llp = { .id = HCI_UART_LL, .name = "LL", + .setup = ll_setup, .open = ll_open, .close = ll_close, .recv = ll_recv, @@ -518,10 +773,14 @@ static const struct hci_uart_proto llp = { int __init ll_init(void) { + serdev_device_driver_register(&hci_ti_drv); + return hci_uart_register_proto(&llp); } int __exit ll_deinit(void) { + serdev_device_driver_unregister(&hci_ti_drv); + return hci_uart_unregister_proto(&llp); } |
