Implement serial reconf

drivers/serial/common.inc

@@ -1,3 +1,5 @@
+SERIAL_COMPATIBLE_API_VER = 0 ; increments in case of breaking changes
+
 SERIAL_API_GET_VERSION = 0
 SERIAL_API_SRV_ADD_PORT = 1
 SERIAL_API_SRV_REMOVE_PORT = 2
@@ -21,14 +23,18 @@ SERIAL_CONF_PARITY_ODD = 2
 SERIAL_CONF_PARITY_MARK = 3
 SERIAL_CONF_PARITY_SPACE = 4
 
+SERIAL_CONF_STOP_BITS_1 = 0
+SERIAL_CONF_STOP_BITS_1_5 = 1
+SERIAL_CONF_STOP_BITS_2 = 2
+
 SERIAL_CONF_FLOW_CTRL_NONE = 0
 
 struct  SP_DRIVER
         size            dd ? ; size of this struct
-        startup         dd ? ; void __stdcall (*startup)(void *drv_data, const struct serial_conf *conf);
-        shutdown        dd ? ; void __stdcall (*shutdown)(void *drv_data);
-        reconf          dd ? ; void __stdcall (*reconf)(void *drv_data, const struct serial_conf *conf);
-        tx              dd ? ; void __stdcall (*tx)(void *drv_data);
+        startup         dd ? ; int __stdcall (*startup)(void *drv_data, const struct serial_conf *conf);
+        shutdown        dd ? ; int __stdcall (*shutdown)(void *drv_data);
+        reconf          dd ? ; int __stdcall (*reconf)(void *drv_data, const struct serial_conf *conf);
+        tx              dd ? ; int __stdcall (*tx)(void *drv_data);
 ends
 
 struct  SP_CONF
@@ -123,6 +129,30 @@ proc serial_port_init
         ret
 endp
 
+proc serial_port_get_version stdcall, version:dword
+locals
+        .handler    dd ?
+        .io_code    dd ?
+        .input      dd ?
+        .inp_size   dd ?
+        .output     dd ?
+        .out_size   dd ?
+endl
+        mov     eax, [serial_drv_handle]
+        mov     [.handler], eax
+        mov     dword [.io_code], SERIAL_API_GET_VERSION
+        mov     [.input], 0
+        mov     dword [.inp_size], 0
+        mov     eax, [version]
+        mov     [.output], eax
+        mov     dword [.out_size], 4
+
+        lea     ecx, [.handler]
+        mcall   SF_SYS_MISC, SSF_CONTROL_DRIVER
+        
+        ret
+endp
+
 proc serial_port_open stdcall uses ebx, port_id:dword, conf:dword, handle:dword
 locals
         .handler    dd ?

drivers/serial/serial.asm

@@ -9,8 +9,6 @@ __DEBUG_LEVEL__ = L_DBG
 
 SERIAL_RING_BUF_SIZE = 32768
 
-API_VERSION = 1
-
 section '.flat' readable writable executable
 
 include '../struct.inc'
@@ -23,6 +21,9 @@ include 'common.inc'
 include 'ring_buf.inc'
 include 'uart16550.inc'
 
+CURRENT_API = 0x0001
+API_VERSION = (SERIAL_COMPATIBLE_API_VER shl 16) + CURRENT_API
+
 struct  SERIAL_OBJ
         magic           dd ?
         destroy         dd ?
@@ -45,7 +46,7 @@ struct  SERIAL_PORT
         conf            SP_CONF
 ends
 
-proc START c, reason:dword
+proc START c, reason:dword, cmdline:dword
         cmp     [reason], DRV_ENTRY
         jne     .fail
 
@@ -347,15 +348,12 @@ proc sp_validate_conf
         mov     eax, [ecx + SP_CONF.baudrate]
         test    eax, eax
         jz      .fail
-        mov     al, [ecx + SP_CONF.word_size]
-        cmp     al, 8
-        jne     .fail ; TODO implement different word size
         mov     al, [ecx + SP_CONF.stop_bits]
-        cmp     al, 1
-        jne     .fail ; TODO implement different stop bits count
+        cmp     al, SERIAL_CONF_STOP_BITS_2
+        ja      .fail
         mov     al, [ecx + SP_CONF.parity]
-        cmp     al, SERIAL_CONF_PARITY_NONE
-        jne     .fail ; TODO implement parity
+        cmp     al, SERIAL_CONF_PARITY_SPACE
+        ja      .fail
         mov     al, [ecx + SP_CONF.flow_ctrl]
         cmp     al, SERIAL_CONF_FLOW_CTRL_NONE
         jne     .fail ; TODO implement flow control
@@ -550,7 +548,6 @@ proc sp_setup
         mov     eax, [edi + SERIAL_PORT.drv]
         mov     ecx, [edi + SERIAL_PORT.drv_data]
         stdcall dword [eax + SP_DRIVER.reconf], ecx, esi
-        xor     eax, eax
         push    eax
         test    eax, eax
         jnz     @f

drivers/serial/uart16550.inc

@@ -350,10 +350,10 @@ endl
         ; calc  stop bits
         mov     bx, LCR_STOP_1
         mov     al, [esi + SP_CONF.stop_bits]
-        cmp     al, 1
+        cmp     al, SERIAL_CONF_STOP_BITS_1
         je      .stop_bits_ok
         or      bx, LCR_STOP_2
-        cmp     al, 2
+        cmp     al, SERIAL_CONF_STOP_BITS_2
         jne     .fail
   .stop_bits_ok:
         or      [lcr], bx