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