target/linux/generic/pending-6.1/900-0002-Adding-DA16600-reset-by-GPIO.patch

   1 From 03b82d621adb7145d008eabb8995f14ad9582d56 Mon Sep 17 00:00:00 2001
   2 From: Alvin Park <alvin.park.pv@renesas.com>
   3 Date: Wed, 4 May 2022 17:02:26 +0900
   4 Subject: [PATCH] Adding DA16600 reset by GPIO
   5
   6 ---
   7  drivers/bluetooth/hci_renesas.c | 51 ++++++++++++++++++++++++++++++++-
   8  1 file changed, 50 insertions(+), 1 deletion(-)
   9
  10 --- a/drivers/bluetooth/hci_renesas.c
  11 +++ b/drivers/bluetooth/hci_renesas.c
  12 @@ -18,6 +18,7 @@
  13  #include <linux/module.h>
  14  #include <linux/of.h>
  15  #include <linux/serdev.h>
  16 +#include <linux/gpio/consumer.h>
  17  #include <net/bluetooth/bluetooth.h>
  18  #include <net/bluetooth/hci_core.h>
  19
  20 @@ -37,6 +38,10 @@ enum {
  21         STATE_FW_BOOTED
  22  };
  23
  24 +#define VERSION "0.1"
  25 +
  26 +#define FIRMWARE_DA14531       "renesas/hci_531.bin"
  27 +
  28  #define STX            0x02
  29  #define SOH            0x01
  30  #define ACK            0x06
  31 @@ -45,6 +50,8 @@ enum {
  32
  33  struct renesas_serdev {
  34         struct hci_uart hu;
  35 +
  36 +       struct gpio_desc *reset;
  37  };
  38
  39  struct renesas_data {
  40 @@ -161,6 +168,32 @@ static int renesas_send_fw_size(struct h
  41         return 0;
  42  }
  43
  44 +static void reset_device(struct gpio_desc *gpio)
  45 +{
  46 +       if (gpiod_get_value(gpio) == 0) {
  47 +               gpiod_set_value_cansleep(gpio, 1);
  48 +               usleep_range(1000, 2000);
  49 +       }
  50 +       gpiod_set_value_cansleep(gpio, 0);
  51 +       usleep_range(5000, 10000);
  52 +       gpiod_direction_input(gpio);
  53 +}
  54 +
  55 +static void renesas_reset(struct hci_uart *hu)
  56 +{
  57 +       struct serdev_device *serdev = hu->serdev;
  58 +       if (serdev) {
  59 +               struct renesas_serdev *rdatadev = serdev_device_get_drvdata(serdev);
  60 +               if (rdatadev && rdatadev->reset) {
  61 +                       reset_device(rdatadev->reset);
  62 +               } else {
  63 +                       bt_dev_warn(hu->hdev, "Reset pin is not available!");
  64 +               }
  65 +       } else {
  66 +               bt_dev_warn(hu->hdev, "Reset is required!");
  67 +       }
  68 +}
  69 +
  70  static int renesas_load_firmware(struct hci_dev *hdev, const char *name)
  71  {
  72         struct hci_uart *hu = hci_get_drvdata(hdev);
  73 @@ -189,6 +222,9 @@ static int renesas_load_firmware(struct
  74         rdata->state = STATE_FW_INIT;
  75         set_bit(STATE_FW_STX_PENDING, &rdata->flags);
  76
  77 +       /* reset */
  78 +       renesas_reset(hu);
  79 +
  80         while (rdata->state != STATE_FW_DONE) {
  81                 struct sk_buff *skb;
  82
  83 @@ -296,7 +332,7 @@ static int renesas_setup(struct hci_uart
  84
  85         hci_uart_set_flow_control(hu, true);
  86
  87 -       err = renesas_load_firmware(hu->hdev, "renesas/hci_531.bin");
  88 +       err = renesas_load_firmware(hu->hdev, FIRMWARE_DA14531);
  89         if (err)
  90                 return err;
  91
  92 @@ -432,6 +468,13 @@ static int renesas_serdev_probe(struct s
  93         rdatadev->hu.serdev = serdev;
  94         serdev_device_set_drvdata(serdev, rdatadev);
  95
  96 +       rdatadev->reset = devm_gpiod_get(&serdev->dev, "reset", GPIOD_OUT_HIGH);
  97 +       if (IS_ERR(rdatadev->reset)) {
  98 +               int err = 0;
  99 +               err = PTR_ERR(rdatadev->reset);
 100 +               dev_warn(&serdev->dev, "could not get reset gpio: %d", err);
 101 +       }
 102 +
 103         return hci_uart_register_device(&rdatadev->hu, &renesas_proto);
 104  }
 105
 106 @@ -472,3 +515,9 @@ int __exit renesas_deinit(void)
 107
 108         return hci_uart_unregister_proto(&renesas_proto);
 109  }
 110 +
 111 +MODULE_AUTHOR("Alvin Park <alvin.park.pv@renesas.com>");
 112 +MODULE_DESCRIPTION("Renesas Bluetooth Serial driver ver " VERSION);
 113 +MODULE_VERSION(VERSION);
 114 +MODULE_LICENSE("GPL");
 115 +MODULE_FIRMWARE(FIRMWARE_DA14531);