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https://github.com/AsahiLinux/u-boot
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8b85dfc675
At present various drivers etc. access the device's 'seq' member directly. This makes it harder to change the meaning of that member. Change access to go through a function instead. The drivers/i2c/lpc32xx_i2c.c file is left unchanged for now. Signed-off-by: Simon Glass <sjg@chromium.org>
134 lines
3 KiB
C
134 lines
3 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (c) 2020 Wind River Systems, Inc.
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*
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* Author:
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* Bin Meng <bin.meng@windriver.com>
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*
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* A command interface to access misc devices with MISC uclass driver APIs.
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*/
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#include <common.h>
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#include <command.h>
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#include <dm.h>
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#include <errno.h>
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#include <misc.h>
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enum misc_op {
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MISC_OP_READ,
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MISC_OP_WRITE
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};
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static char *misc_op_str[] = {
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"read",
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"write"
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};
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static int do_misc_list(struct cmd_tbl *cmdtp, int flag,
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int argc, char *const argv[])
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{
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struct udevice *dev;
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printf("Device Index Driver\n");
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printf("-------------------------------------\n");
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for (uclass_first_device(UCLASS_MISC, &dev);
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dev;
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uclass_next_device(&dev)) {
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printf("%-20s %5d %10s\n", dev->name, dev_seq(dev),
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dev->driver->name);
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}
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return 0;
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}
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static int do_misc_op(struct cmd_tbl *cmdtp, int flag,
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int argc, char *const argv[], enum misc_op op)
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{
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int (*misc_op)(struct udevice *, int, void *, int);
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struct udevice *dev;
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int offset;
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void *buf;
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int size;
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int ret;
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ret = uclass_get_device_by_name(UCLASS_MISC, argv[0], &dev);
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if (ret) {
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printf("Unable to find device %s\n", argv[0]);
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return ret;
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}
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offset = simple_strtoul(argv[1], NULL, 16);
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buf = (void *)simple_strtoul(argv[2], NULL, 16);
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size = simple_strtoul(argv[3], NULL, 16);
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if (op == MISC_OP_READ)
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misc_op = misc_read;
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else
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misc_op = misc_write;
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ret = misc_op(dev, offset, buf, size);
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if (ret < 0) {
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if (ret == -ENOSYS) {
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printf("The device does not support %s\n",
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misc_op_str[op]);
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ret = 0;
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}
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} else {
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if (ret == size)
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ret = 0;
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else
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printf("Partially %s %d bytes\n", misc_op_str[op], ret);
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}
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return ret;
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}
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static int do_misc_read(struct cmd_tbl *cmdtp, int flag,
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int argc, char *const argv[])
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{
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return do_misc_op(cmdtp, flag, argc, argv, MISC_OP_READ);
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}
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static int do_misc_write(struct cmd_tbl *cmdtp, int flag,
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int argc, char *const argv[])
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{
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return do_misc_op(cmdtp, flag, argc, argv, MISC_OP_WRITE);
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}
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static struct cmd_tbl misc_commands[] = {
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U_BOOT_CMD_MKENT(list, 0, 1, do_misc_list, "", ""),
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U_BOOT_CMD_MKENT(read, 4, 1, do_misc_read, "", ""),
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U_BOOT_CMD_MKENT(write, 4, 1, do_misc_write, "", ""),
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};
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static int do_misc(struct cmd_tbl *cmdtp, int flag,
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int argc, char *const argv[])
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{
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struct cmd_tbl *misc_cmd;
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int ret;
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if (argc < 2)
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return CMD_RET_USAGE;
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misc_cmd = find_cmd_tbl(argv[1], misc_commands,
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ARRAY_SIZE(misc_commands));
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argc -= 2;
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argv += 2;
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if (!misc_cmd || argc != misc_cmd->maxargs)
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return CMD_RET_USAGE;
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ret = misc_cmd->cmd(misc_cmd, flag, argc, argv);
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return cmd_process_error(misc_cmd, ret);
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}
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U_BOOT_CMD(
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misc, 6, 1, do_misc,
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"Access miscellaneous devices with MISC uclass driver APIs",
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"list - list all miscellaneous devices\n"
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"misc read name offset addr len - read `len' bytes starting at\n"
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" `offset' of device `name'\n"
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" to memory at `addr'\n"
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"misc write name offset addr len - write `len' bytes starting at\n"
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" `offset' of device `name'\n"
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" from memory at `addr'"
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);
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