Bill Richardson | 71af4b5 | 2015-02-02 12:26:27 +0100 | [diff] [blame^] | 1 | /* |
| 2 | * cros_ec_sysfs - expose the Chrome OS EC through sysfs |
| 3 | * |
| 4 | * Copyright (C) 2014 Google, Inc. |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify |
| 7 | * it under the terms of the GNU General Public License as published by |
| 8 | * the Free Software Foundation; either version 2 of the License, or |
| 9 | * (at your option) any later version. |
| 10 | * |
| 11 | * This program is distributed in the hope that it will be useful, |
| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 | * GNU General Public License for more details. |
| 15 | * |
| 16 | * You should have received a copy of the GNU General Public License |
| 17 | * along with this program. If not, see <http://www.gnu.org/licenses/>. |
| 18 | */ |
| 19 | |
| 20 | #define pr_fmt(fmt) "cros_ec_sysfs: " fmt |
| 21 | |
| 22 | #include <linux/ctype.h> |
| 23 | #include <linux/delay.h> |
| 24 | #include <linux/device.h> |
| 25 | #include <linux/fs.h> |
| 26 | #include <linux/kobject.h> |
| 27 | #include <linux/mfd/cros_ec.h> |
| 28 | #include <linux/mfd/cros_ec_commands.h> |
| 29 | #include <linux/module.h> |
| 30 | #include <linux/platform_device.h> |
| 31 | #include <linux/printk.h> |
| 32 | #include <linux/stat.h> |
| 33 | #include <linux/types.h> |
| 34 | #include <linux/uaccess.h> |
| 35 | |
| 36 | #include "cros_ec_dev.h" |
| 37 | |
| 38 | /* Accessor functions */ |
| 39 | |
| 40 | static ssize_t show_ec_reboot(struct device *dev, |
| 41 | struct device_attribute *attr, char *buf) |
| 42 | { |
| 43 | int count = 0; |
| 44 | |
| 45 | count += scnprintf(buf + count, PAGE_SIZE - count, |
| 46 | "ro|rw|cancel|cold|disable-jump|hibernate"); |
| 47 | count += scnprintf(buf + count, PAGE_SIZE - count, |
| 48 | " [at-shutdown]\n"); |
| 49 | return count; |
| 50 | } |
| 51 | |
| 52 | static ssize_t store_ec_reboot(struct device *dev, |
| 53 | struct device_attribute *attr, |
| 54 | const char *buf, size_t count) |
| 55 | { |
| 56 | static const struct { |
| 57 | const char * const str; |
| 58 | uint8_t cmd; |
| 59 | uint8_t flags; |
| 60 | } words[] = { |
| 61 | {"cancel", EC_REBOOT_CANCEL, 0}, |
| 62 | {"ro", EC_REBOOT_JUMP_RO, 0}, |
| 63 | {"rw", EC_REBOOT_JUMP_RW, 0}, |
| 64 | {"cold", EC_REBOOT_COLD, 0}, |
| 65 | {"disable-jump", EC_REBOOT_DISABLE_JUMP, 0}, |
| 66 | {"hibernate", EC_REBOOT_HIBERNATE, 0}, |
| 67 | {"at-shutdown", -1, EC_REBOOT_FLAG_ON_AP_SHUTDOWN}, |
| 68 | }; |
| 69 | struct cros_ec_command msg = { 0 }; |
| 70 | struct ec_params_reboot_ec *param = |
| 71 | (struct ec_params_reboot_ec *)msg.outdata; |
| 72 | int got_cmd = 0, offset = 0; |
| 73 | int i; |
| 74 | int ret; |
| 75 | struct cros_ec_device *ec = dev_get_drvdata(dev); |
| 76 | |
| 77 | param->flags = 0; |
| 78 | while (1) { |
| 79 | /* Find word to start scanning */ |
| 80 | while (buf[offset] && isspace(buf[offset])) |
| 81 | offset++; |
| 82 | if (!buf[offset]) |
| 83 | break; |
| 84 | |
| 85 | for (i = 0; i < ARRAY_SIZE(words); i++) { |
| 86 | if (!strncasecmp(words[i].str, buf+offset, |
| 87 | strlen(words[i].str))) { |
| 88 | if (words[i].flags) { |
| 89 | param->flags |= words[i].flags; |
| 90 | } else { |
| 91 | param->cmd = words[i].cmd; |
| 92 | got_cmd = 1; |
| 93 | } |
| 94 | break; |
| 95 | } |
| 96 | } |
| 97 | |
| 98 | /* On to the next word, if any */ |
| 99 | while (buf[offset] && !isspace(buf[offset])) |
| 100 | offset++; |
| 101 | } |
| 102 | |
| 103 | if (!got_cmd) |
| 104 | return -EINVAL; |
| 105 | |
| 106 | msg.command = EC_CMD_REBOOT_EC; |
| 107 | msg.outsize = sizeof(param); |
| 108 | ret = cros_ec_cmd_xfer(ec, &msg); |
| 109 | if (ret < 0) |
| 110 | return ret; |
| 111 | if (msg.result != EC_RES_SUCCESS) { |
| 112 | dev_dbg(ec->dev, "EC result %d\n", msg.result); |
| 113 | return -EINVAL; |
| 114 | } |
| 115 | |
| 116 | return count; |
| 117 | } |
| 118 | |
| 119 | static ssize_t show_ec_version(struct device *dev, |
| 120 | struct device_attribute *attr, char *buf) |
| 121 | { |
| 122 | static const char * const image_names[] = {"unknown", "RO", "RW"}; |
| 123 | struct ec_response_get_version *r_ver; |
| 124 | struct ec_response_get_chip_info *r_chip; |
| 125 | struct ec_response_board_version *r_board; |
| 126 | struct cros_ec_command msg = { 0 }; |
| 127 | int ret; |
| 128 | int count = 0; |
| 129 | struct cros_ec_device *ec = dev_get_drvdata(dev); |
| 130 | |
| 131 | /* Get versions. RW may change. */ |
| 132 | msg.command = EC_CMD_GET_VERSION; |
| 133 | msg.insize = sizeof(*r_ver); |
| 134 | ret = cros_ec_cmd_xfer(ec, &msg); |
| 135 | if (ret < 0) |
| 136 | return ret; |
| 137 | if (msg.result != EC_RES_SUCCESS) |
| 138 | return scnprintf(buf, PAGE_SIZE, |
| 139 | "ERROR: EC returned %d\n", msg.result); |
| 140 | |
| 141 | r_ver = (struct ec_response_get_version *)msg.indata; |
| 142 | /* Strings should be null-terminated, but let's be sure. */ |
| 143 | r_ver->version_string_ro[sizeof(r_ver->version_string_ro) - 1] = '\0'; |
| 144 | r_ver->version_string_rw[sizeof(r_ver->version_string_rw) - 1] = '\0'; |
| 145 | count += scnprintf(buf + count, PAGE_SIZE - count, |
| 146 | "RO version: %s\n", r_ver->version_string_ro); |
| 147 | count += scnprintf(buf + count, PAGE_SIZE - count, |
| 148 | "RW version: %s\n", r_ver->version_string_rw); |
| 149 | count += scnprintf(buf + count, PAGE_SIZE - count, |
| 150 | "Firmware copy: %s\n", |
| 151 | (r_ver->current_image < ARRAY_SIZE(image_names) ? |
| 152 | image_names[r_ver->current_image] : "?")); |
| 153 | |
| 154 | /* Get build info. */ |
| 155 | msg.command = EC_CMD_GET_BUILD_INFO; |
| 156 | msg.insize = sizeof(msg.indata); |
| 157 | ret = cros_ec_cmd_xfer(ec, &msg); |
| 158 | if (ret < 0) |
| 159 | count += scnprintf(buf + count, PAGE_SIZE - count, |
| 160 | "Build info: XFER ERROR %d\n", ret); |
| 161 | else if (msg.result != EC_RES_SUCCESS) |
| 162 | count += scnprintf(buf + count, PAGE_SIZE - count, |
| 163 | "Build info: EC error %d\n", msg.result); |
| 164 | else { |
| 165 | msg.indata[sizeof(msg.indata) - 1] = '\0'; |
| 166 | count += scnprintf(buf + count, PAGE_SIZE - count, |
| 167 | "Build info: %s\n", msg.indata); |
| 168 | } |
| 169 | |
| 170 | /* Get chip info. */ |
| 171 | msg.command = EC_CMD_GET_CHIP_INFO; |
| 172 | msg.insize = sizeof(*r_chip); |
| 173 | ret = cros_ec_cmd_xfer(ec, &msg); |
| 174 | if (ret < 0) |
| 175 | count += scnprintf(buf + count, PAGE_SIZE - count, |
| 176 | "Chip info: XFER ERROR %d\n", ret); |
| 177 | else if (msg.result != EC_RES_SUCCESS) |
| 178 | count += scnprintf(buf + count, PAGE_SIZE - count, |
| 179 | "Chip info: EC error %d\n", msg.result); |
| 180 | else { |
| 181 | r_chip = (struct ec_response_get_chip_info *)msg.indata; |
| 182 | |
| 183 | r_chip->vendor[sizeof(r_chip->vendor) - 1] = '\0'; |
| 184 | r_chip->name[sizeof(r_chip->name) - 1] = '\0'; |
| 185 | r_chip->revision[sizeof(r_chip->revision) - 1] = '\0'; |
| 186 | count += scnprintf(buf + count, PAGE_SIZE - count, |
| 187 | "Chip vendor: %s\n", r_chip->vendor); |
| 188 | count += scnprintf(buf + count, PAGE_SIZE - count, |
| 189 | "Chip name: %s\n", r_chip->name); |
| 190 | count += scnprintf(buf + count, PAGE_SIZE - count, |
| 191 | "Chip revision: %s\n", r_chip->revision); |
| 192 | } |
| 193 | |
| 194 | /* Get board version */ |
| 195 | msg.command = EC_CMD_GET_BOARD_VERSION; |
| 196 | msg.insize = sizeof(*r_board); |
| 197 | ret = cros_ec_cmd_xfer(ec, &msg); |
| 198 | if (ret < 0) |
| 199 | count += scnprintf(buf + count, PAGE_SIZE - count, |
| 200 | "Board version: XFER ERROR %d\n", ret); |
| 201 | else if (msg.result != EC_RES_SUCCESS) |
| 202 | count += scnprintf(buf + count, PAGE_SIZE - count, |
| 203 | "Board version: EC error %d\n", msg.result); |
| 204 | else { |
| 205 | r_board = (struct ec_response_board_version *)msg.indata; |
| 206 | |
| 207 | count += scnprintf(buf + count, PAGE_SIZE - count, |
| 208 | "Board version: %d\n", |
| 209 | r_board->board_version); |
| 210 | } |
| 211 | |
| 212 | return count; |
| 213 | } |
| 214 | |
| 215 | static ssize_t show_ec_flashinfo(struct device *dev, |
| 216 | struct device_attribute *attr, char *buf) |
| 217 | { |
| 218 | struct ec_response_flash_info *resp; |
| 219 | struct cros_ec_command msg = { 0 }; |
| 220 | int ret; |
| 221 | struct cros_ec_device *ec = dev_get_drvdata(dev); |
| 222 | |
| 223 | /* The flash info shouldn't ever change, but ask each time anyway. */ |
| 224 | msg.command = EC_CMD_FLASH_INFO; |
| 225 | msg.insize = sizeof(*resp); |
| 226 | ret = cros_ec_cmd_xfer(ec, &msg); |
| 227 | if (ret < 0) |
| 228 | return ret; |
| 229 | if (msg.result != EC_RES_SUCCESS) |
| 230 | return scnprintf(buf, PAGE_SIZE, |
| 231 | "ERROR: EC returned %d\n", msg.result); |
| 232 | |
| 233 | resp = (struct ec_response_flash_info *)msg.indata; |
| 234 | |
| 235 | return scnprintf(buf, PAGE_SIZE, |
| 236 | "FlashSize %d\nWriteSize %d\n" |
| 237 | "EraseSize %d\nProtectSize %d\n", |
| 238 | resp->flash_size, resp->write_block_size, |
| 239 | resp->erase_block_size, resp->protect_block_size); |
| 240 | } |
| 241 | |
| 242 | /* Module initialization */ |
| 243 | |
| 244 | static DEVICE_ATTR(reboot, S_IWUSR | S_IRUGO, show_ec_reboot, store_ec_reboot); |
| 245 | static DEVICE_ATTR(version, S_IRUGO, show_ec_version, NULL); |
| 246 | static DEVICE_ATTR(flashinfo, S_IRUGO, show_ec_flashinfo, NULL); |
| 247 | |
| 248 | static struct attribute *__ec_attrs[] = { |
| 249 | &dev_attr_reboot.attr, |
| 250 | &dev_attr_version.attr, |
| 251 | &dev_attr_flashinfo.attr, |
| 252 | NULL, |
| 253 | }; |
| 254 | |
| 255 | static struct attribute_group ec_attr_group = { |
| 256 | .attrs = __ec_attrs, |
| 257 | }; |
| 258 | |
| 259 | void ec_dev_sysfs_init(struct cros_ec_device *ec) |
| 260 | { |
| 261 | int error; |
| 262 | |
| 263 | error = sysfs_create_group(&ec->vdev->kobj, &ec_attr_group); |
| 264 | if (error) |
| 265 | pr_warn("failed to create group: %d\n", error); |
| 266 | } |
| 267 | |
| 268 | void ec_dev_sysfs_remove(struct cros_ec_device *ec) |
| 269 | { |
| 270 | sysfs_remove_group(&ec->vdev->kobj, &ec_attr_group); |
| 271 | } |