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https://github.com/smaeul/u-boot.git
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54aa07fdfc
This uses the newly-added dm_gpio_get_values_as_int_base3 function to implement a sysinfo device. The revision map is stored in the device tree. Signed-off-by: Sean Anderson <sean.anderson@seco.com> Reviewed-by: Simon Glass <sjg@chromium.org>
142 lines
3.1 KiB
C
142 lines
3.1 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (C) 2021 Sean Anderson <sean.anderson@seco.com>
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*/
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#include <common.h>
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#include <dm.h>
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#include <log.h>
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#include <sysinfo.h>
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#include <asm/gpio.h>
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#include <dm/device_compat.h>
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/**
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* struct sysinfo_gpio_priv - GPIO sysinfo private data
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* @gpios: List of GPIOs used to detect the revision
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* @gpio_num: The number of GPIOs in @gpios
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* @revision: The revision as detected from the GPIOs.
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*/
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struct sysinfo_gpio_priv {
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struct gpio_desc *gpios;
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int gpio_num, revision;
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};
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static int sysinfo_gpio_detect(struct udevice *dev)
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{
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int ret;
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struct sysinfo_gpio_priv *priv = dev_get_priv(dev);
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ret = dm_gpio_get_values_as_int_base3(priv->gpios, priv->gpio_num);
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if (ret < 0)
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return ret;
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priv->revision = ret;
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return 0;
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}
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static int sysinfo_gpio_get_int(struct udevice *dev, int id, int *val)
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{
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struct sysinfo_gpio_priv *priv = dev_get_priv(dev);
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switch (id) {
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case SYSINFO_ID_BOARD_MODEL:
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*val = priv->revision;
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return 0;
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default:
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return -EINVAL;
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};
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}
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static int sysinfo_gpio_get_str(struct udevice *dev, int id, size_t size, char *val)
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{
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struct sysinfo_gpio_priv *priv = dev_get_priv(dev);
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switch (id) {
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case SYSINFO_ID_BOARD_MODEL: {
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const char *name = NULL;
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int i, ret;
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u32 revision;
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for (i = 0; i < priv->gpio_num; i++) {
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ret = dev_read_u32_index(dev, "revisions", i,
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&revision);
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if (ret) {
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if (ret != -EOVERFLOW)
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return ret;
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break;
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}
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if (revision == priv->revision) {
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ret = dev_read_string_index(dev, "names", i,
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&name);
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if (ret < 0)
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return ret;
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break;
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}
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}
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if (!name)
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name = "unknown";
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strncpy(val, name, size);
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val[size - 1] = '\0';
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return 0;
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} default:
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return -EINVAL;
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};
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}
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static const struct sysinfo_ops sysinfo_gpio_ops = {
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.detect = sysinfo_gpio_detect,
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.get_int = sysinfo_gpio_get_int,
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.get_str = sysinfo_gpio_get_str,
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};
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static int sysinfo_gpio_probe(struct udevice *dev)
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{
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int ret;
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struct sysinfo_gpio_priv *priv = dev_get_priv(dev);
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priv->gpio_num = gpio_get_list_count(dev, "gpios");
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if (priv->gpio_num < 0) {
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dev_err(dev, "could not get gpios length (err = %d)\n",
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priv->gpio_num);
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return priv->gpio_num;
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}
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priv->gpios = calloc(priv->gpio_num, sizeof(*priv->gpios));
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if (!priv->gpios) {
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dev_err(dev, "could not allocate memory for %d gpios\n",
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priv->gpio_num);
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return -ENOMEM;
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}
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ret = gpio_request_list_by_name(dev, "gpios", priv->gpios,
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priv->gpio_num, GPIOD_IS_IN);
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if (ret != priv->gpio_num) {
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dev_err(dev, "could not get gpios (err = %d)\n",
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priv->gpio_num);
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return ret;
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}
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if (!dev_read_bool(dev, "revisions") || !dev_read_bool(dev, "names")) {
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dev_err(dev, "revisions or names properties missing\n");
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return -ENOENT;
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}
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return 0;
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}
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static const struct udevice_id sysinfo_gpio_ids[] = {
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{ .compatible = "gpio-sysinfo" },
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{ /* sentinel */ }
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};
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U_BOOT_DRIVER(sysinfo_gpio) = {
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.name = "sysinfo_gpio",
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.id = UCLASS_SYSINFO,
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.of_match = sysinfo_gpio_ids,
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.ops = &sysinfo_gpio_ops,
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.priv_auto = sizeof(struct sysinfo_gpio_priv),
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.probe = sysinfo_gpio_probe,
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};
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