Sean Anderson | 54aa07f | 2021-04-20 10:50:57 -0400 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0+ |
| 2 | /* |
| 3 | * Copyright (C) 2021 Sean Anderson <sean.anderson@seco.com> |
| 4 | */ |
| 5 | |
| 6 | #include <common.h> |
| 7 | #include <dm.h> |
| 8 | #include <log.h> |
| 9 | #include <sysinfo.h> |
| 10 | #include <asm/gpio.h> |
| 11 | #include <dm/device_compat.h> |
| 12 | |
| 13 | /** |
| 14 | * struct sysinfo_gpio_priv - GPIO sysinfo private data |
| 15 | * @gpios: List of GPIOs used to detect the revision |
| 16 | * @gpio_num: The number of GPIOs in @gpios |
| 17 | * @revision: The revision as detected from the GPIOs. |
| 18 | */ |
| 19 | struct sysinfo_gpio_priv { |
| 20 | struct gpio_desc *gpios; |
| 21 | int gpio_num, revision; |
| 22 | }; |
| 23 | |
| 24 | static int sysinfo_gpio_detect(struct udevice *dev) |
| 25 | { |
| 26 | int ret; |
| 27 | struct sysinfo_gpio_priv *priv = dev_get_priv(dev); |
| 28 | |
| 29 | ret = dm_gpio_get_values_as_int_base3(priv->gpios, priv->gpio_num); |
| 30 | if (ret < 0) |
| 31 | return ret; |
| 32 | |
| 33 | priv->revision = ret; |
| 34 | return 0; |
| 35 | } |
| 36 | |
| 37 | static int sysinfo_gpio_get_int(struct udevice *dev, int id, int *val) |
| 38 | { |
| 39 | struct sysinfo_gpio_priv *priv = dev_get_priv(dev); |
| 40 | |
| 41 | switch (id) { |
| 42 | case SYSINFO_ID_BOARD_MODEL: |
| 43 | *val = priv->revision; |
| 44 | return 0; |
| 45 | default: |
| 46 | return -EINVAL; |
| 47 | }; |
| 48 | } |
| 49 | |
| 50 | static int sysinfo_gpio_get_str(struct udevice *dev, int id, size_t size, char *val) |
| 51 | { |
| 52 | struct sysinfo_gpio_priv *priv = dev_get_priv(dev); |
| 53 | |
| 54 | switch (id) { |
| 55 | case SYSINFO_ID_BOARD_MODEL: { |
| 56 | const char *name = NULL; |
| 57 | int i, ret; |
| 58 | u32 revision; |
| 59 | |
Rasmus Villemoes | 19213d7 | 2023-03-10 11:58:03 +0100 | [diff] [blame] | 60 | for (i = 0; ; i++) { |
Sean Anderson | 54aa07f | 2021-04-20 10:50:57 -0400 | [diff] [blame] | 61 | ret = dev_read_u32_index(dev, "revisions", i, |
| 62 | &revision); |
| 63 | if (ret) { |
| 64 | if (ret != -EOVERFLOW) |
| 65 | return ret; |
| 66 | break; |
| 67 | } |
| 68 | |
| 69 | if (revision == priv->revision) { |
| 70 | ret = dev_read_string_index(dev, "names", i, |
| 71 | &name); |
| 72 | if (ret < 0) |
| 73 | return ret; |
| 74 | break; |
| 75 | } |
| 76 | } |
| 77 | if (!name) |
| 78 | name = "unknown"; |
| 79 | |
| 80 | strncpy(val, name, size); |
| 81 | val[size - 1] = '\0'; |
| 82 | return 0; |
Rasmus Villemoes | 19213d7 | 2023-03-10 11:58:03 +0100 | [diff] [blame] | 83 | } |
| 84 | default: |
Sean Anderson | 54aa07f | 2021-04-20 10:50:57 -0400 | [diff] [blame] | 85 | return -EINVAL; |
| 86 | }; |
| 87 | } |
| 88 | |
| 89 | static const struct sysinfo_ops sysinfo_gpio_ops = { |
| 90 | .detect = sysinfo_gpio_detect, |
| 91 | .get_int = sysinfo_gpio_get_int, |
| 92 | .get_str = sysinfo_gpio_get_str, |
| 93 | }; |
| 94 | |
| 95 | static int sysinfo_gpio_probe(struct udevice *dev) |
| 96 | { |
| 97 | int ret; |
| 98 | struct sysinfo_gpio_priv *priv = dev_get_priv(dev); |
| 99 | |
| 100 | priv->gpio_num = gpio_get_list_count(dev, "gpios"); |
| 101 | if (priv->gpio_num < 0) { |
| 102 | dev_err(dev, "could not get gpios length (err = %d)\n", |
| 103 | priv->gpio_num); |
| 104 | return priv->gpio_num; |
| 105 | } |
| 106 | |
| 107 | priv->gpios = calloc(priv->gpio_num, sizeof(*priv->gpios)); |
| 108 | if (!priv->gpios) { |
| 109 | dev_err(dev, "could not allocate memory for %d gpios\n", |
| 110 | priv->gpio_num); |
| 111 | return -ENOMEM; |
| 112 | } |
| 113 | |
| 114 | ret = gpio_request_list_by_name(dev, "gpios", priv->gpios, |
| 115 | priv->gpio_num, GPIOD_IS_IN); |
| 116 | if (ret != priv->gpio_num) { |
| 117 | dev_err(dev, "could not get gpios (err = %d)\n", |
| 118 | priv->gpio_num); |
| 119 | return ret; |
| 120 | } |
| 121 | |
| 122 | if (!dev_read_bool(dev, "revisions") || !dev_read_bool(dev, "names")) { |
| 123 | dev_err(dev, "revisions or names properties missing\n"); |
| 124 | return -ENOENT; |
| 125 | } |
| 126 | |
| 127 | return 0; |
| 128 | } |
| 129 | |
| 130 | static const struct udevice_id sysinfo_gpio_ids[] = { |
| 131 | { .compatible = "gpio-sysinfo" }, |
| 132 | { /* sentinel */ } |
| 133 | }; |
| 134 | |
| 135 | U_BOOT_DRIVER(sysinfo_gpio) = { |
| 136 | .name = "sysinfo_gpio", |
| 137 | .id = UCLASS_SYSINFO, |
| 138 | .of_match = sysinfo_gpio_ids, |
| 139 | .ops = &sysinfo_gpio_ops, |
| 140 | .priv_auto = sizeof(struct sysinfo_gpio_priv), |
| 141 | .probe = sysinfo_gpio_probe, |
| 142 | }; |