user: Please show me the C implementation that matches the assembly code listed below:

```asm
<update_blc_ratio>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  sub    $0x20,%rsp
  mov    %rdi,-0x18(%rbp)
  mov    -0x18(%rbp),%rax
  mov    %rax,%rdx
  mov    $0xdf,%esi
  mov    $0x3d84,%edi
  mov    $0x0,%eax
  call   <write_sccb16@plt>
  mov    -0x18(%rbp),%rax
  mov    %rax,%rdx
  mov    $0x1,%esi
  mov    $0x3d81,%edi
  mov    $0x0,%eax
  call   <write_sccb16@plt>
  mov    $0x5,%edi
  mov    $0x0,%eax
  call   <msleep@plt>
  mov    -0x18(%rbp),%rax
  mov    %rax,%rsi
  mov    $0x3d0b,%edi
  mov    $0x0,%eax
  call   <read_sccb16@plt>
  mov    %eax,-0x8(%rbp)
  cmpl   $0x0,-0x8(%rbp)
  je     L22
  cmpl   $0x14,-0x8(%rbp)
  jle    L22
  cmpl   $0x40,-0x8(%rbp)
  jg     L22
  lea    D47(%rip),%rax
  mov    %rax,%rsi
  lea    D0(%rip),%rax
  mov    %rax,%rdi
  mov    $0x0,%eax
  call   <pr_err@plt>
  mov    -0x18(%rbp),%rax
  mov    %rax,%rsi
  mov    $0x4008,%edi
  mov    $0x0,%eax
  call   <read_sccb16@plt>
  mov    %eax,-0x4(%rbp)
  andl   $0xfb,-0x4(%rbp)
  mov    -0x18(%rbp),%rdx
  mov    -0x4(%rbp),%eax
  mov    %eax,%esi
  mov    $0x4008,%edi
  mov    $0x0,%eax
  call   <write_sccb16@plt>
  mov    -0x18(%rbp),%rax
  mov    %rax,%rsi
  mov    $0x4000,%edi
  mov    $0x0,%eax
  call   <read_sccb16@plt>
  mov    %eax,-0x4(%rbp)
  andl   $0xf7,-0x4(%rbp)
  mov    -0x18(%rbp),%rdx
  mov    -0x4(%rbp),%eax
  mov    %eax,%esi
  mov    $0x4000,%edi
  mov    $0x0,%eax
  call   <write_sccb16@plt>
  mov    $0x2,%eax
  jmp    L28
L22:
  mov    -0x18(%rbp),%rax
  mov    %rax,%rsi
  mov    $0x3d0a,%edi
  mov    $0x0,%eax
  call   <read_sccb16@plt>
  mov    %eax,-0x8(%rbp)
  cmpl   $0xf,-0x8(%rbp)
  jle    L38
  cmpl   $0x40,-0x8(%rbp)
  jg     L38
  lea    D47(%rip),%rax
  mov    %rax,%rsi
  lea    D7(%rip),%rax
  mov    %rax,%rdi
  mov    $0x0,%eax
  call   <pr_err@plt>
  mov    -0x18(%rbp),%rdx
  mov    -0x8(%rbp),%eax
  mov    %eax,%esi
  mov    $0x4006,%edi
  mov    $0x0,%eax
  call   <write_sccb16@plt>
  mov    -0x18(%rbp),%rax
  mov    %rax,%rsi
  mov    $0x4008,%edi
  mov    $0x0,%eax
  call   <read_sccb16@plt>
  mov    %eax,-0x4(%rbp)
  andl   $0xfb,-0x4(%rbp)
  mov    -0x18(%rbp),%rdx
  mov    -0x4(%rbp),%eax
  mov    %eax,%esi
  mov    $0x4008,%edi
  mov    $0x0,%eax
  call   <write_sccb16@plt>
  mov    -0x18(%rbp),%rax
  mov    %rax,%rsi
  mov    $0x4000,%edi
  mov    $0x0,%eax
  call   <read_sccb16@plt>
  mov    %eax,-0x4(%rbp)
  orl    $0x8,-0x4(%rbp)
  mov    -0x18(%rbp),%rdx
  mov    -0x4(%rbp),%eax
  mov    %eax,%esi
  mov    $0x4000,%edi
  mov    $0x0,%eax
  call   <write_sccb16@plt>
  mov    $0x1,%eax
  jmp    L28
L38:
  lea    D47(%rip),%rax
  mov    %rax,%rsi
  lea    D45(%rip),%rax
  mov    %rax,%rdi
  mov    $0x0,%eax
  call   <pr_err@plt>
  mov    -0x18(%rbp),%rax
  mov    %rax,%rdx
  mov    $0x20,%esi
  mov    $0x4006,%edi
  mov    $0x0,%eax
  call   <write_sccb16@plt>
  mov    -0x18(%rbp),%rax
  mov    %rax,%rsi
  mov    $0x4008,%edi
  mov    $0x0,%eax
  call   <read_sccb16@plt>
  mov    %eax,-0x4(%rbp)
  andl   $0xfb,-0x4(%rbp)
  mov    -0x18(%rbp),%rdx
  mov    -0x4(%rbp),%eax
  mov    %eax,%esi
  mov    $0x4008,%edi
  mov    $0x0,%eax
  call   <write_sccb16@plt>
  mov    -0x18(%rbp),%rax
  mov    %rax,%rsi
  mov    $0x4000,%edi
  mov    $0x0,%eax
  call   <read_sccb16@plt>
  mov    %eax,-0x4(%rbp)
  orl    $0x8,-0x4(%rbp)
  mov    -0x18(%rbp),%rdx
  mov    -0x4(%rbp),%eax
  mov    %eax,%esi
  mov    $0x4000,%edi
  mov    $0x0,%eax
  call   <write_sccb16@plt>
  mov    $0x0,%eax
L28:
  leave
  ret
```

tool_calls: name: extract_symbolic_data
arguments: data_label: D47
data_type: string
name: extract_symbolic_data
arguments: data_label: D0
data_type: string
name: extract_symbolic_data
arguments: data_label: D7
data_type: string
name: extract_symbolic_data
arguments: data_label: D45
data_type: string

tool: D47: update_blc_ratio

tool: D0: %s  auto load mode 

tool: D7: %s  manual load mode 

tool: D45: %s  set to default 

assistant: ```c
int update_blc_ratio(struct msm_sensor_ctrl_t *a_ctrl) {
  int K, temp;
  write_sccb16(0x3d84, 0xdf, a_ctrl);
  write_sccb16(0x3d81, 0x01, a_ctrl);
  msleep(5);
  K = read_sccb16(0x3d0b, a_ctrl);
  if (K != 0) {
    if ((K >= 0x15) && (K <= 0x40)) {
      pr_err("%s  auto load mode ", __func__);
      temp = read_sccb16(0x4008, a_ctrl);
      temp &= 0xfb;
      write_sccb16(0x4008, temp, a_ctrl);
      temp = read_sccb16(0x4000, a_ctrl);
      temp &= 0xf7;
      write_sccb16(0x4000, temp, a_ctrl);
      return 2;
    }
  }
  K = read_sccb16(0x3d0a, a_ctrl);
  if ((K >= 0x10) && (K <= 0x40)) {
    pr_err("%s  manual load mode ", __func__);
    write_sccb16(0x4006, K, a_ctrl);
    temp = read_sccb16(0x4008, a_ctrl);
    temp &= 0xfb;
    write_sccb16(0x4008, temp, a_ctrl);
    temp = read_sccb16(0x4000, a_ctrl);
    temp |= 0x08;
    write_sccb16(0x4000, temp, a_ctrl);
    return 1;
  } else {
    pr_err("%s  set to default ", __func__);
    write_sccb16(0x4006, 0x20, a_ctrl);
    temp = read_sccb16(0x4008, a_ctrl);
    temp &= 0xfb;
    write_sccb16(0x4008, temp, a_ctrl);
    temp = read_sccb16(0x4000, a_ctrl);
    temp |= 0x08;
    write_sccb16(0x4000, temp, a_ctrl);
    return 0;
  }
}
```