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Commit 06afa388 authored by Marek Vasut's avatar Marek Vasut Committed by Tom Rini
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i2c: kerneldoc: Add kerneldoc annotations to cmd_i2c.c 


Add kerneldoc style documentation into cmd_i2c.c to properly describe
all overridable functions and most of the command interface.

Signed-off-by: default avatarMarek Vasut <marex@denx.de>
Cc: Heiko Schocher <hs@denx.de>
parent 7f86bd57
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with 179 additions and 15 deletions
common/cmd_i2c.c
+ 179
− 15
View file @ 06afa388
......@@ -133,7 +133,13 @@ DECLARE_GLOBAL_DATA_PTR;
#define DISP_LINE_LEN 16
/* implement possible board specific board init */
/**
* i2c_init_board() - Board-specific I2C bus init
*
* This function is the default no-op implementation of I2C bus
* initialization. This function can be overriden by board-specific
* implementation if needed.
*/
__weak
void i2c_init_board(void)
{
......@@ -141,12 +147,38 @@ void i2c_init_board(void)
}
/* TODO: Implement architecture-specific get/set functions */
/**
* i2c_get_bus_speed() - Return I2C bus speed
*
* This function is the default implementation of function for retrieveing
* the current I2C bus speed in Hz.
*
* A driver implementing runtime switching of I2C bus speed must override
* this function to report the speed correctly. Simple or legacy drivers
* can use this fallback.
*
* Returns I2C bus speed in Hz.
*/
__weak
unsigned int i2c_get_bus_speed(void)
{
return CONFIG_SYS_I2C_SPEED;
}
/**
* i2c_set_bus_speed() - Configure I2C bus speed
* @speed: Newly set speed of the I2C bus in Hz
*
* This function is the default implementation of function for setting
* the I2C bus speed in Hz.
*
* A driver implementing runtime switching of I2C bus speed must override
* this function to report the speed correctly. Simple or legacy drivers
* can use this fallback.
*
* Returns zero on success, negative value on error.
*/
__weak
int i2c_set_bus_speed(unsigned int speed)
{
......@@ -156,9 +188,10 @@ int i2c_set_bus_speed(unsigned int speed)
return 0;
}
/*
* get_alen: small parser helper function to get address length
* returns the address length
/**
* get_alen() - Small parser helper function to get address length
*
* Returns the address length.
*/
static uint get_alen(char *arg)
{
......@@ -176,11 +209,19 @@ static uint get_alen(char *arg)
return alen;
}
/*
/**
* do_i2c_read() - Handle the "i2c read" command-line command
* @cmdtp: Command data struct pointer
* @flag: Command flag
* @argc: Command-line argument count
* @argv: Array of command-line arguments
*
* Returns zero on success, CMD_RET_USAGE in case of misuse and negative
* on error.
*
* Syntax:
* i2c read {i2c_chip} {devaddr}{.0, .1, .2} {len} {memaddr}
*/
static int do_i2c_read ( cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
{
u_char chip;
......@@ -269,7 +310,16 @@ static int do_i2c_write(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[
return 0;
}
/*
/**
* do_i2c_md() - Handle the "i2c md" command-line command
* @cmdtp: Command data struct pointer
* @flag: Command flag
* @argc: Command-line argument count
* @argv: Array of command-line arguments
*
* Returns zero on success, CMD_RET_USAGE in case of misuse and negative
* on error.
*
* Syntax:
* i2c md {i2c_chip} {addr}{.0, .1, .2} {len}
*/
......@@ -361,8 +411,15 @@ static int do_i2c_md ( cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]
return 0;
}
/* Write (fill) memory
/**
* do_i2c_mw() - Handle the "i2c mw" command-line command
* @cmdtp: Command data struct pointer
* @flag: Command flag
* @argc: Command-line argument count
* @argv: Array of command-line arguments
*
* Returns zero on success, CMD_RET_USAGE in case of misuse and negative
* on error.
*
* Syntax:
* i2c mw {i2c_chip} {addr}{.0, .1, .2} {data} [{count}]
......@@ -419,10 +476,20 @@ static int do_i2c_mw ( cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]
#endif
}
return (0);
return 0;
}
/* Calculate a CRC on memory
/**
* do_i2c_crc() - Handle the "i2c crc32" command-line command
* @cmdtp: Command data struct pointer
* @flag: Command flag
* @argc: Command-line argument count
* @argv: Array of command-line arguments
*
* Calculate a CRC on memory
*
* Returns zero on success, CMD_RET_USAGE in case of misuse and negative
* on error.
*
* Syntax:
* i2c crc32 {i2c_chip} {addr}{.0, .1, .2} {count}
......@@ -479,13 +546,22 @@ static int do_i2c_crc (cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]
return 0;
}
/* Modify memory.
/**
* mod_i2c_mem() - Handle the "i2c mm" and "i2c nm" command-line command
* @cmdtp: Command data struct pointer
* @flag: Command flag
* @argc: Command-line argument count
* @argv: Array of command-line arguments
*
* Modify memory.
*
* Returns zero on success, CMD_RET_USAGE in case of misuse and negative
* on error.
*
* Syntax:
* i2c mm{.b, .w, .l} {i2c_chip} {addr}{.0, .1, .2}
* i2c nm{.b, .w, .l} {i2c_chip} {addr}{.0, .1, .2}
*/
static int
mod_i2c_mem(cmd_tbl_t *cmdtp, int incrflag, int flag, int argc, char * const argv[])
{
......@@ -601,7 +677,16 @@ mod_i2c_mem(cmd_tbl_t *cmdtp, int incrflag, int flag, int argc, char * const arg
return 0;
}
/*
/**
* do_i2c_probe() - Handle the "i2c probe" command-line command
* @cmdtp: Command data struct pointer
* @flag: Command flag
* @argc: Command-line argument count
* @argv: Array of command-line arguments
*
* Returns zero on success, CMD_RET_USAGE in case of misuse and negative
* on error.
*
* Syntax:
* i2c probe {addr}
*
......@@ -655,7 +740,16 @@ static int do_i2c_probe (cmd_tbl_t *cmdtp, int flag, int argc, char * const argv
return (0 == found);
}
/*
/**
* do_i2c_loop() - Handle the "i2c loop" command-line command
* @cmdtp: Command data struct pointer
* @flag: Command flag
* @argc: Command-line argument count
* @argv: Array of command-line arguments
*
* Returns zero on success, CMD_RET_USAGE in case of misuse and negative
* on error.
*
* Syntax:
* i2c loop {i2c_chip} {addr}{.0, .1, .2} [{length}] [{delay}]
* {length} - Number of bytes to read
......@@ -716,6 +810,8 @@ static int do_i2c_loop(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]
/*
* The SDRAM command is separately configured because many
* (most?) embedded boards don't use SDRAM DIMMs.
*
* FIXME: Document and probably move elsewhere!
*/
#if defined(CONFIG_CMD_SDRAM)
static void print_ddr2_tcyc (u_char const b)
......@@ -1245,6 +1341,15 @@ static int do_sdram (cmd_tbl_t * cmdtp, int flag, int argc, char * const argv[])
#endif
#if defined(CONFIG_I2C_MUX)
/**
* do_i2c_add_bus() - Handle the "i2c bus" command-line command
* @cmdtp: Command data struct pointer
* @flag: Command flag
* @argc: Command-line argument count
* @argv: Array of command-line arguments
*
* Returns zero always.
*/
static int do_i2c_add_bus(cmd_tbl_t * cmdtp, int flag, int argc, char * const argv[])
{
int ret=0;
......@@ -1274,6 +1379,16 @@ static int do_i2c_add_bus(cmd_tbl_t * cmdtp, int flag, int argc, char * const ar
#endif /* CONFIG_I2C_MUX */
#if defined(CONFIG_I2C_MULTI_BUS)
/**
* do_i2c_bus_num() - Handle the "i2c dev" command-line command
* @cmdtp: Command data struct pointer
* @flag: Command flag
* @argc: Command-line argument count
* @argv: Array of command-line arguments
*
* Returns zero on success, CMD_RET_USAGE in case of misuse and negative
* on error.
*/
static int do_i2c_bus_num(cmd_tbl_t * cmdtp, int flag, int argc, char * const argv[])
{
int bus_idx, ret=0;
......@@ -1292,6 +1407,16 @@ static int do_i2c_bus_num(cmd_tbl_t * cmdtp, int flag, int argc, char * const ar
}
#endif /* CONFIG_I2C_MULTI_BUS */
/**
* do_i2c_bus_speed() - Handle the "i2c speed" command-line command
* @cmdtp: Command data struct pointer
* @flag: Command flag
* @argc: Command-line argument count
* @argv: Array of command-line arguments
*
* Returns zero on success, CMD_RET_USAGE in case of misuse and negative
* on error.
*/
static int do_i2c_bus_speed(cmd_tbl_t * cmdtp, int flag, int argc, char * const argv[])
{
int speed, ret=0;
......@@ -1309,16 +1434,45 @@ static int do_i2c_bus_speed(cmd_tbl_t * cmdtp, int flag, int argc, char * const
return ret;
}
/**
* do_i2c_mm() - Handle the "i2c mm" command-line command
* @cmdtp: Command data struct pointer
* @flag: Command flag
* @argc: Command-line argument count
* @argv: Array of command-line arguments
*
* Returns zero on success, CMD_RET_USAGE in case of misuse and negative
* on error.
*/
static int do_i2c_mm(cmd_tbl_t * cmdtp, int flag, int argc, char * const argv[])
{
return mod_i2c_mem (cmdtp, 1, flag, argc, argv);
}
/**
* do_i2c_nm() - Handle the "i2c nm" command-line command
* @cmdtp: Command data struct pointer
* @flag: Command flag
* @argc: Command-line argument count
* @argv: Array of command-line arguments
*
* Returns zero on success, CMD_RET_USAGE in case of misuse and negative
* on error.
*/
static int do_i2c_nm(cmd_tbl_t * cmdtp, int flag, int argc, char * const argv[])
{
return mod_i2c_mem (cmdtp, 0, flag, argc, argv);
}
/**
* do_i2c_reset() - Handle the "i2c reset" command-line command
* @cmdtp: Command data struct pointer
* @flag: Command flag
* @argc: Command-line argument count
* @argv: Array of command-line arguments
*
* Returns zero always.
*/
static int do_i2c_reset(cmd_tbl_t * cmdtp, int flag, int argc, char * const argv[])
{
i2c_init(CONFIG_SYS_I2C_SPEED, CONFIG_SYS_I2C_SLAVE);
......@@ -1354,6 +1508,16 @@ void i2c_reloc(void) {
}
#endif
/**
* do_i2c() - Handle the "i2c" command-line command
* @cmdtp: Command data struct pointer
* @flag: Command flag
* @argc: Command-line argument count
* @argv: Array of command-line arguments
*
* Returns zero on success, CMD_RET_USAGE in case of misuse and negative
* on error.
*/
static int do_i2c(cmd_tbl_t * cmdtp, int flag, int argc, char * const argv[])
{
cmd_tbl_t *c;
......
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