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usb2514: make it more modular/configurable

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laforge/owhw2
Harald Welte 8 years ago
parent 1c6616736c
commit 89435bf483
1 changed files with 253 additions and 50 deletions
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303
recipes-bsp/sob-odu/files/usb2514.c
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@ -23,6 +23,7 @@
#include <stdint.h>
#include <limits.h>
#include <fcntl.h>
#include <string.h>
#include <sys/ioctl.h>
#include <sys/stat.h>
@ -30,11 +31,94 @@
/* #include <linux/i2c-dev.h> */
#include "i2c-dev.h"
#define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
#define USB2514_SLAVE_ADDR 0x2C
enum compare_op {
EQUAL,
NOT_EQUAL,
LESS_THAN_OR_EQUAL,
GREATER_THAN_OR_EQUAL,
};
struct usb2514_board {
const char *name;
unsigned int i2c_bus;
uint8_t i2c_addr;
const char *board_version_file;
unsigned int board_version;
enum compare_op board_version_op;
uint8_t ports_swap;
const char *reset_gpio_path;
int reset_low_active;
};
struct board_group {
/* new /sys/firmware/devicetree/base/model */
const char *device_tree_name;
/* old pre-device tree kernels, "Hardware :" in /proc/cpuinfo */
const char *proc_name;
const struct usb2514_board *boards;
unsigned int num_boards;
};
static const struct usb2514_board odu_boards[] = {
{
.name = "sob-odu v1",
.i2c_bus = 0,
.i2c_addr = 0x2C,
.board_version_file = "/sys/devices/platform/sob-odu.0/board_version",
.board_version = 1,
.board_version_op = EQUAL,
.ports_swap = 0x00, /* ports are still swapped in hardware */
.reset_gpio_path = "/sys/devices/platform/sob-odu.0/gpio_hub_reset/value",
.reset_low_active = 1,
}, {
.name = "sob-odu v2",
.i2c_bus = 0,
.i2c_addr = 0x2C,
.board_version_file = "/sys/devices/platform/sob-odu.0/board_version",
.board_version = 2,
.board_version_op = EQUAL,
.ports_swap = 0x0E, /* swap DN1, DN2, DN3 */
.reset_gpio_path = "/sys/devices/platform/sob-odu.0/gpio_hub_reset/value",
.reset_low_active = 0,
}, {
.name = "sob-odu v2",
.i2c_bus = 0,
.i2c_addr = 0x2C,
.board_version_file = "/sys/devices/platform/sob-odu.0/board_version",
.board_version = 0, /* EEPROM Empty ?!? */
.board_version_op = EQUAL,
.ports_swap = 0x0E, /* swap DN1, DN2, DN3 */
.reset_gpio_path = "/sys/devices/platform/sob-odu.0/gpio_hub_reset/value",
.reset_low_active = 0,
}, {
.name = "sob-odu v3+",
.i2c_bus = 0,
.i2c_addr = 0x2C,
.board_version_file = "/sys/devices/platform/sob-odu.0/board_version",
.board_version = 3,
.board_version_op = GREATER_THAN_OR_EQUAL,
.ports_swap = 0x0C, /* swap only DN2 and DN3 */
.reset_gpio_path = "/sys/devices/platform/sob-odu.0/gpio_hub_reset/value",
.reset_low_active = 0,
},
};
static const struct board_group boards[] = {
{
.proc_name = "sob-odu",
.device_tree_name = "sysmocom ODU",
.boards = odu_boards,
.num_boards = ARRAY_SIZE(odu_boards),
},
};
#define BOARD_VER_PATH "/sys/devices/platform/sob-odu.0/board_version"
#define RESET_PATH "/sys/devices/platform/sob-odu.0/gpio_hub_reset/value"
#define RESET_PATH_OLD "/sys/class/gpio/gpio62/value"
/* Default configuration as per data sheet */
@ -119,7 +203,7 @@ static int g_fd;
static unsigned long get_support(void)
{
int rc;
unsigned long funcs;
unsigned long funcs = 0;
rc = ioctl(g_fd, I2C_FUNCS, funcs);
@ -128,7 +212,6 @@ static unsigned long get_support(void)
return funcs;
}
static int write_regs(const uint8_t *regs)
{
unsigned int i;
@ -145,12 +228,12 @@ static int write_regs(const uint8_t *regs)
}
/* attempt to obtain the board version from sysfs */
static int get_board_version(void)
static int get_board_version(const char *ver_file)
{
FILE *f;
unsigned int ver;
f = fopen(BOARD_VER_PATH, "r");
f = fopen(ver_file, "r");
if (!f)
return -1;
@ -164,20 +247,143 @@ static int get_board_version(void)
return ver;
}
/* attempt to reset the hub via sysfs */
static int reset_hub(void)
static int board_ver_matches(const struct usb2514_board *board,
unsigned int version)
{
switch (board->board_version_op) {
case EQUAL:
return (version == board->board_version);
case NOT_EQUAL:
return (version != board->board_version);
case LESS_THAN_OR_EQUAL:
return (version <= board->board_version);
case GREATER_THAN_OR_EQUAL:
return (version >= board->board_version);
default:
return 0;
}
}
static char *get_proc_name(void)
{
FILE *f = fopen("/proc/cpuinfo", "r");
char linebuf[256];
while (fgets(linebuf, sizeof(linebuf), f)) {
/* strip LF at the end of line */
char *lf = strrchr(linebuf, '\n');
if (lf)
*lf = '\0';
if (strncmp(linebuf, "Hardware", 8) &&
strncmp(linebuf, "machine", 7))
continue;
/* search for the colon */
char *colon = strchr(linebuf, ':');
if (!colon)
continue;
colon++;
/* strip any leading whitespace */
while (*colon == ' ' || *colon == '\t')
colon++;
fclose(f);
return strdup(colon);
}
fclose(f);
return NULL;
}
static char *get_dt_name(void)
{
FILE *f;
int invert_logic = 0;
f = fopen(RESET_PATH, "w");
if (!f) {
f = fopen(RESET_PATH_OLD, "w");
if (!f)
return -1;
invert_logic = 1;
char *name = NULL;
char linebuf[256];
f = fopen("/sys/firmware/devicetree/base/model", "r");
if (!f)
return NULL;
if (!fgets(linebuf, sizeof(linebuf), f)) {
fclose(f);
return NULL;
}
fclose(f);
return strdup(linebuf);
}
static const struct board_group *find_matching_board_group()
{
int i;
char *proc_name, *dt_name;
proc_name = get_proc_name();
dt_name = get_dt_name();
for (i = 0; i < ARRAY_SIZE(boards); i++) {
const struct board_group *bgrp = &boards[i];
if (dt_name && bgrp->device_tree_name &&
!strcmp(dt_name, bgrp->device_tree_name)) {
free(proc_name);
free(dt_name);
return bgrp;
}
if (proc_name && bgrp->proc_name &&
!strcmp(proc_name, bgrp->proc_name)) {
free(proc_name);
free(dt_name);
return bgrp;
}
}
free(proc_name);
free(dt_name);
return NULL;
}
static const struct usb2514_board *
find_matching_board(const struct board_group *bgrp)
{
int i;
for (i = 0; i < bgrp->num_boards; i++) {
const struct usb2514_board *board = &bgrp->boards[i];
int ver;
if (board->board_version_file) {
/* get board version and compare */
ver = get_board_version(board->board_version_file);
if (ver < 0)
continue;
if (!board_ver_matches(board, ver))
continue;
}
return board;
}
return NULL;
}
/* attempt to reset the hub via sysfs */
static int reset_hub(const char *reset_path, int invert_logic)
{
FILE *f;
f = fopen(reset_path, "w");
if (!f)
return -1;
if (invert_logic)
fputs("0", f);
else
@ -198,56 +404,53 @@ static int reset_hub(void)
int main(int argc, char **argv)
{
int rc;
int board_version;
int adapter_nr;
long slave_addr = USB2514_SLAVE_ADDR;
char filename[PATH_MAX];
const struct board_group *bgrp;
const struct usb2514_board *board;
if (argc < 2) {
fprintf(stderr, "You have to specify I2C bus number\n");
exit(2);
bgrp = find_matching_board_group();
if (!bgrp) {
fprintf(stderr, "Cannot find matching board group for this system\n");
exit(1);
}
printf("Found matching board group %s(%s)\n", bgrp->proc_name, bgrp->device_tree_name);
adapter_nr = atoi(argv[1]);
snprintf(filename, sizeof(filename)-1, "/dev/i2c-%d", adapter_nr);
board = find_matching_board(bgrp);
if (!board) {
fprintf(stderr, "Cannot find matching config for this system\n");
exit(1);
}
printf("Found matching board %s\n", board->name);
/* open the I2C bus device */
snprintf(filename, sizeof(filename)-1, "/dev/i2c-%d", board->i2c_bus);
rc = open(filename, O_RDWR);
if (rc < 0) {
fprintf(stderr, "Error opening the device: %d\n", rc);
fprintf(stderr, "Error opening the device %s: %d\n", filename, rc);
exit(1);
}
g_fd = rc;
get_support();
board_version = get_board_version();
if (board_version >= 3) {
/* on board version 3 and later we don't need to swap
* USB downlink port 1 */
printf("Detected board >= v3, not swapping DN1\n");
usb2514_odu[0xFA] = 0x0C;
} else if (board_version == 1) {
/* ports are still swapped in hardware */
printf("Detected board v1, not swapping any ports\n");
usb2514_odu[0xFA] = 0x00;
} else if (board_version == 2) {
printf("Detected board v2, swapping DN1, DN2 and DN3\n");
/* default */
} else {
printf("Assuming board v2, swapping DN1, DN2 and DN3\n");
/* default */
}
/* set the slave address */
rc = ioctl(g_fd, I2C_SLAVE, slave_addr);
rc = ioctl(g_fd, I2C_SLAVE, board->i2c_addr);
if (rc < 0) {
fprintf(stderr, "Error setting slave addr: %d\n", rc);
exit(1);
}
/* First reset the USB hub before loading data into it */
if (reset_hub() < 0) {
fprintf(stderr, "Couldn't reset the USB hub!\n");
}
if (board->reset_gpio_path) {
/* First reset the USB hub before loading data into it */
if (reset_hub(board->reset_gpio_path, board->reset_low_active) < 0) {
fprintf(stderr, "Couldn't reset the USB hub!\n");
}
} else
fprintf(stderr, "board config doesn't indicate USB hub reset GPIO\n");
/* patch the port inversion byte into the array */
usb2514_odu[0xFA] = board->ports_swap;
rc = write_regs(usb2514_odu);
if (rc < 0) {

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