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/slab.h> 33 #include <linux/stat.h> 34 #include <linux/types.h> 35 #include <linux/uaccess.h> 36 37 #include "cros_ec_dev.h" 38 39 /* Accessor functions */ 40 41 static ssize_t show_ec_reboot(struct device *dev, 42 struct device_attribute *attr, char *buf) 43 { 44 int count = 0; 45 46 count += scnprintf(buf + count, PAGE_SIZE - count, 47 "ro|rw|cancel|cold|disable-jump|hibernate"); 48 count += scnprintf(buf + count, PAGE_SIZE - count, 49 " [at-shutdown]\n"); 50 return count; 51 } 52 53 static ssize_t store_ec_reboot(struct device *dev, 54 struct device_attribute *attr, 55 const char *buf, size_t count) 56 { 57 static const struct { 58 const char * const str; 59 uint8_t cmd; 60 uint8_t flags; 61 } words[] = { 62 {"cancel", EC_REBOOT_CANCEL, 0}, 63 {"ro", EC_REBOOT_JUMP_RO, 0}, 64 {"rw", EC_REBOOT_JUMP_RW, 0}, 65 {"cold", EC_REBOOT_COLD, 0}, 66 {"disable-jump", EC_REBOOT_DISABLE_JUMP, 0}, 67 {"hibernate", EC_REBOOT_HIBERNATE, 0}, 68 {"at-shutdown", -1, EC_REBOOT_FLAG_ON_AP_SHUTDOWN}, 69 }; 70 struct cros_ec_command *msg; 71 struct ec_params_reboot_ec *param; 72 int got_cmd = 0, offset = 0; 73 int i; 74 int ret; 75 struct cros_ec_dev *ec = container_of(dev, 76 struct cros_ec_dev, class_dev); 77 78 msg = kmalloc(sizeof(*msg) + sizeof(*param), GFP_KERNEL); 79 if (!msg) 80 return -ENOMEM; 81 82 param = (struct ec_params_reboot_ec *)msg->data; 83 84 param->flags = 0; 85 while (1) { 86 /* Find word to start scanning */ 87 while (buf[offset] && isspace(buf[offset])) 88 offset++; 89 if (!buf[offset]) 90 break; 91 92 for (i = 0; i < ARRAY_SIZE(words); i++) { 93 if (!strncasecmp(words[i].str, buf+offset, 94 strlen(words[i].str))) { 95 if (words[i].flags) { 96 param->flags |= words[i].flags; 97 } else { 98 param->cmd = words[i].cmd; 99 got_cmd = 1; 100 } 101 break; 102 } 103 } 104 105 /* On to the next word, if any */ 106 while (buf[offset] && !isspace(buf[offset])) 107 offset++; 108 } 109 110 if (!got_cmd) { 111 count = -EINVAL; 112 goto exit; 113 } 114 115 msg->version = 0; 116 msg->command = EC_CMD_REBOOT_EC + ec->cmd_offset; 117 msg->outsize = sizeof(*param); 118 msg->insize = 0; 119 ret = cros_ec_cmd_xfer(ec->ec_dev, msg); 120 if (ret < 0) { 121 count = ret; 122 goto exit; 123 } 124 if (msg->result != EC_RES_SUCCESS) { 125 dev_dbg(ec->dev, "EC result %d\n", msg->result); 126 count = -EINVAL; 127 } 128 exit: 129 kfree(msg); 130 return count; 131 } 132 133 static ssize_t show_ec_version(struct device *dev, 134 struct device_attribute *attr, char *buf) 135 { 136 static const char * const image_names[] = {"unknown", "RO", "RW"}; 137 struct ec_response_get_version *r_ver; 138 struct ec_response_get_chip_info *r_chip; 139 struct ec_response_board_version *r_board; 140 struct cros_ec_command *msg; 141 int ret; 142 int count = 0; 143 struct cros_ec_dev *ec = container_of(dev, 144 struct cros_ec_dev, class_dev); 145 146 msg = kmalloc(sizeof(*msg) + EC_HOST_PARAM_SIZE, GFP_KERNEL); 147 if (!msg) 148 return -ENOMEM; 149 150 /* Get versions. RW may change. */ 151 msg->version = 0; 152 msg->command = EC_CMD_GET_VERSION + ec->cmd_offset; 153 msg->insize = sizeof(*r_ver); 154 msg->outsize = 0; 155 ret = cros_ec_cmd_xfer(ec->ec_dev, msg); 156 if (ret < 0) { 157 count = ret; 158 goto exit; 159 } 160 if (msg->result != EC_RES_SUCCESS) { 161 count = scnprintf(buf, PAGE_SIZE, 162 "ERROR: EC returned %d\n", msg->result); 163 goto exit; 164 } 165 166 r_ver = (struct ec_response_get_version *)msg->data; 167 /* Strings should be null-terminated, but let's be sure. */ 168 r_ver->version_string_ro[sizeof(r_ver->version_string_ro) - 1] = '\0'; 169 r_ver->version_string_rw[sizeof(r_ver->version_string_rw) - 1] = '\0'; 170 count += scnprintf(buf + count, PAGE_SIZE - count, 171 "RO version: %s\n", r_ver->version_string_ro); 172 count += scnprintf(buf + count, PAGE_SIZE - count, 173 "RW version: %s\n", r_ver->version_string_rw); 174 count += scnprintf(buf + count, PAGE_SIZE - count, 175 "Firmware copy: %s\n", 176 (r_ver->current_image < ARRAY_SIZE(image_names) ? 177 image_names[r_ver->current_image] : "?")); 178 179 /* Get build info. */ 180 msg->command = EC_CMD_GET_BUILD_INFO + ec->cmd_offset; 181 msg->insize = EC_HOST_PARAM_SIZE; 182 ret = cros_ec_cmd_xfer(ec->ec_dev, msg); 183 if (ret < 0) 184 count += scnprintf(buf + count, PAGE_SIZE - count, 185 "Build info: XFER ERROR %d\n", ret); 186 else if (msg->result != EC_RES_SUCCESS) 187 count += scnprintf(buf + count, PAGE_SIZE - count, 188 "Build info: EC error %d\n", msg->result); 189 else { 190 msg->data[sizeof(msg->data) - 1] = '\0'; 191 count += scnprintf(buf + count, PAGE_SIZE - count, 192 "Build info: %s\n", msg->data); 193 } 194 195 /* Get chip info. */ 196 msg->command = EC_CMD_GET_CHIP_INFO + ec->cmd_offset; 197 msg->insize = sizeof(*r_chip); 198 ret = cros_ec_cmd_xfer(ec->ec_dev, msg); 199 if (ret < 0) 200 count += scnprintf(buf + count, PAGE_SIZE - count, 201 "Chip info: XFER ERROR %d\n", ret); 202 else if (msg->result != EC_RES_SUCCESS) 203 count += scnprintf(buf + count, PAGE_SIZE - count, 204 "Chip info: EC error %d\n", msg->result); 205 else { 206 r_chip = (struct ec_response_get_chip_info *)msg->data; 207 208 r_chip->vendor[sizeof(r_chip->vendor) - 1] = '\0'; 209 r_chip->name[sizeof(r_chip->name) - 1] = '\0'; 210 r_chip->revision[sizeof(r_chip->revision) - 1] = '\0'; 211 count += scnprintf(buf + count, PAGE_SIZE - count, 212 "Chip vendor: %s\n", r_chip->vendor); 213 count += scnprintf(buf + count, PAGE_SIZE - count, 214 "Chip name: %s\n", r_chip->name); 215 count += scnprintf(buf + count, PAGE_SIZE - count, 216 "Chip revision: %s\n", r_chip->revision); 217 } 218 219 /* Get board version */ 220 msg->command = EC_CMD_GET_BOARD_VERSION + ec->cmd_offset; 221 msg->insize = sizeof(*r_board); 222 ret = cros_ec_cmd_xfer(ec->ec_dev, msg); 223 if (ret < 0) 224 count += scnprintf(buf + count, PAGE_SIZE - count, 225 "Board version: XFER ERROR %d\n", ret); 226 else if (msg->result != EC_RES_SUCCESS) 227 count += scnprintf(buf + count, PAGE_SIZE - count, 228 "Board version: EC error %d\n", msg->result); 229 else { 230 r_board = (struct ec_response_board_version *)msg->data; 231 232 count += scnprintf(buf + count, PAGE_SIZE - count, 233 "Board version: %d\n", 234 r_board->board_version); 235 } 236 237 exit: 238 kfree(msg); 239 return count; 240 } 241 242 static ssize_t show_ec_flashinfo(struct device *dev, 243 struct device_attribute *attr, char *buf) 244 { 245 struct ec_response_flash_info *resp; 246 struct cros_ec_command *msg; 247 int ret; 248 struct cros_ec_dev *ec = container_of(dev, 249 struct cros_ec_dev, class_dev); 250 251 msg = kmalloc(sizeof(*msg) + sizeof(*resp), GFP_KERNEL); 252 if (!msg) 253 return -ENOMEM; 254 255 /* The flash info shouldn't ever change, but ask each time anyway. */ 256 msg->version = 0; 257 msg->command = EC_CMD_FLASH_INFO + ec->cmd_offset; 258 msg->insize = sizeof(*resp); 259 msg->outsize = 0; 260 ret = cros_ec_cmd_xfer(ec->ec_dev, msg); 261 if (ret < 0) 262 goto exit; 263 if (msg->result != EC_RES_SUCCESS) { 264 ret = scnprintf(buf, PAGE_SIZE, 265 "ERROR: EC returned %d\n", msg->result); 266 goto exit; 267 } 268 269 resp = (struct ec_response_flash_info *)msg->data; 270 271 ret = scnprintf(buf, PAGE_SIZE, 272 "FlashSize %d\nWriteSize %d\n" 273 "EraseSize %d\nProtectSize %d\n", 274 resp->flash_size, resp->write_block_size, 275 resp->erase_block_size, resp->protect_block_size); 276 exit: 277 kfree(msg); 278 return ret; 279 } 280 281 /* Module initialization */ 282 283 static DEVICE_ATTR(reboot, S_IWUSR | S_IRUGO, show_ec_reboot, store_ec_reboot); 284 static DEVICE_ATTR(version, S_IRUGO, show_ec_version, NULL); 285 static DEVICE_ATTR(flashinfo, S_IRUGO, show_ec_flashinfo, NULL); 286 287 static struct attribute *__ec_attrs[] = { 288 &dev_attr_reboot.attr, 289 &dev_attr_version.attr, 290 &dev_attr_flashinfo.attr, 291 NULL, 292 }; 293 294 struct attribute_group cros_ec_attr_group = { 295 .attrs = __ec_attrs, 296 }; 297 298