1 // SPDX-License-Identifier: GPL-2.0+ 2 // Expose the ChromeOS EC through sysfs 3 // 4 // Copyright (C) 2014 Google, Inc. 5 6 #include <linux/ctype.h> 7 #include <linux/delay.h> 8 #include <linux/device.h> 9 #include <linux/fs.h> 10 #include <linux/kobject.h> 11 #include <linux/module.h> 12 #include <linux/platform_data/cros_ec_commands.h> 13 #include <linux/platform_data/cros_ec_proto.h> 14 #include <linux/platform_device.h> 15 #include <linux/printk.h> 16 #include <linux/slab.h> 17 #include <linux/stat.h> 18 #include <linux/types.h> 19 #include <linux/uaccess.h> 20 21 #define DRV_NAME "cros-ec-sysfs" 22 23 /* Accessor functions */ 24 25 static ssize_t reboot_show(struct device *dev, 26 struct device_attribute *attr, char *buf) 27 { 28 int count = 0; 29 30 count += sysfs_emit_at(buf, count, 31 "ro|rw|cancel|cold|disable-jump|hibernate|cold-ap-off"); 32 count += sysfs_emit_at(buf, count, " [at-shutdown]\n"); 33 return count; 34 } 35 36 static ssize_t reboot_store(struct device *dev, 37 struct device_attribute *attr, 38 const char *buf, size_t count) 39 { 40 static const struct { 41 const char * const str; 42 uint8_t cmd; 43 uint8_t flags; 44 } words[] = { 45 {"cancel", EC_REBOOT_CANCEL, 0}, 46 {"ro", EC_REBOOT_JUMP_RO, 0}, 47 {"rw", EC_REBOOT_JUMP_RW, 0}, 48 {"cold-ap-off", EC_REBOOT_COLD_AP_OFF, 0}, 49 {"cold", EC_REBOOT_COLD, 0}, 50 {"disable-jump", EC_REBOOT_DISABLE_JUMP, 0}, 51 {"hibernate", EC_REBOOT_HIBERNATE, 0}, 52 {"at-shutdown", -1, EC_REBOOT_FLAG_ON_AP_SHUTDOWN}, 53 }; 54 struct cros_ec_command *msg; 55 struct ec_params_reboot_ec *param; 56 int got_cmd = 0, offset = 0; 57 int i; 58 int ret; 59 struct cros_ec_dev *ec = to_cros_ec_dev(dev); 60 61 msg = kmalloc(sizeof(*msg) + sizeof(*param), GFP_KERNEL); 62 if (!msg) 63 return -ENOMEM; 64 65 param = (struct ec_params_reboot_ec *)msg->data; 66 67 param->flags = 0; 68 while (1) { 69 /* Find word to start scanning */ 70 while (buf[offset] && isspace(buf[offset])) 71 offset++; 72 if (!buf[offset]) 73 break; 74 75 for (i = 0; i < ARRAY_SIZE(words); i++) { 76 if (!strncasecmp(words[i].str, buf+offset, 77 strlen(words[i].str))) { 78 if (words[i].flags) { 79 param->flags |= words[i].flags; 80 } else { 81 param->cmd = words[i].cmd; 82 got_cmd = 1; 83 } 84 break; 85 } 86 } 87 88 /* On to the next word, if any */ 89 while (buf[offset] && !isspace(buf[offset])) 90 offset++; 91 } 92 93 if (!got_cmd) { 94 count = -EINVAL; 95 goto exit; 96 } 97 98 msg->version = 0; 99 msg->command = EC_CMD_REBOOT_EC + ec->cmd_offset; 100 msg->outsize = sizeof(*param); 101 msg->insize = 0; 102 ret = cros_ec_cmd_xfer_status(ec->ec_dev, msg); 103 if (ret < 0) 104 count = ret; 105 exit: 106 kfree(msg); 107 return count; 108 } 109 110 static ssize_t version_show(struct device *dev, 111 struct device_attribute *attr, char *buf) 112 { 113 static const char * const image_names[] = {"unknown", "RO", "RW"}; 114 struct ec_response_get_version *r_ver; 115 struct ec_response_get_chip_info *r_chip; 116 struct ec_response_board_version *r_board; 117 struct cros_ec_command *msg; 118 int ret; 119 int count = 0; 120 struct cros_ec_dev *ec = to_cros_ec_dev(dev); 121 122 msg = kmalloc(sizeof(*msg) + EC_HOST_PARAM_SIZE, GFP_KERNEL); 123 if (!msg) 124 return -ENOMEM; 125 126 /* Get versions. RW may change. */ 127 msg->version = 0; 128 msg->command = EC_CMD_GET_VERSION + ec->cmd_offset; 129 msg->insize = sizeof(*r_ver); 130 msg->outsize = 0; 131 ret = cros_ec_cmd_xfer_status(ec->ec_dev, msg); 132 if (ret < 0) { 133 count = ret; 134 goto exit; 135 } 136 r_ver = (struct ec_response_get_version *)msg->data; 137 /* Strings should be null-terminated, but let's be sure. */ 138 r_ver->version_string_ro[sizeof(r_ver->version_string_ro) - 1] = '\0'; 139 r_ver->version_string_rw[sizeof(r_ver->version_string_rw) - 1] = '\0'; 140 count += sysfs_emit_at(buf, count, "RO version: %s\n", r_ver->version_string_ro); 141 count += sysfs_emit_at(buf, count, "RW version: %s\n", r_ver->version_string_rw); 142 count += sysfs_emit_at(buf, count, "Firmware copy: %s\n", 143 (r_ver->current_image < ARRAY_SIZE(image_names) ? 144 image_names[r_ver->current_image] : "?")); 145 146 /* Get build info. */ 147 msg->command = EC_CMD_GET_BUILD_INFO + ec->cmd_offset; 148 msg->insize = EC_HOST_PARAM_SIZE; 149 ret = cros_ec_cmd_xfer_status(ec->ec_dev, msg); 150 if (ret < 0) { 151 count += sysfs_emit_at(buf, count, 152 "Build info: XFER / EC ERROR %d / %d\n", 153 ret, msg->result); 154 } else { 155 msg->data[EC_HOST_PARAM_SIZE - 1] = '\0'; 156 count += sysfs_emit_at(buf, count, "Build info: %s\n", msg->data); 157 } 158 159 /* Get chip info. */ 160 msg->command = EC_CMD_GET_CHIP_INFO + ec->cmd_offset; 161 msg->insize = sizeof(*r_chip); 162 ret = cros_ec_cmd_xfer_status(ec->ec_dev, msg); 163 if (ret < 0) { 164 count += sysfs_emit_at(buf, count, 165 "Chip info: XFER / EC ERROR %d / %d\n", 166 ret, msg->result); 167 } else { 168 r_chip = (struct ec_response_get_chip_info *)msg->data; 169 170 r_chip->vendor[sizeof(r_chip->vendor) - 1] = '\0'; 171 r_chip->name[sizeof(r_chip->name) - 1] = '\0'; 172 r_chip->revision[sizeof(r_chip->revision) - 1] = '\0'; 173 count += sysfs_emit_at(buf, count, "Chip vendor: %s\n", r_chip->vendor); 174 count += sysfs_emit_at(buf, count, "Chip name: %s\n", r_chip->name); 175 count += sysfs_emit_at(buf, count, "Chip revision: %s\n", r_chip->revision); 176 } 177 178 /* Get board version */ 179 msg->command = EC_CMD_GET_BOARD_VERSION + ec->cmd_offset; 180 msg->insize = sizeof(*r_board); 181 ret = cros_ec_cmd_xfer_status(ec->ec_dev, msg); 182 if (ret < 0) { 183 count += sysfs_emit_at(buf, count, 184 "Board version: XFER / EC ERROR %d / %d\n", 185 ret, msg->result); 186 } else { 187 r_board = (struct ec_response_board_version *)msg->data; 188 189 count += sysfs_emit_at(buf, count, 190 "Board version: %d\n", 191 r_board->board_version); 192 } 193 194 exit: 195 kfree(msg); 196 return count; 197 } 198 199 static ssize_t flashinfo_show(struct device *dev, 200 struct device_attribute *attr, char *buf) 201 { 202 struct ec_response_flash_info *resp; 203 struct cros_ec_command *msg; 204 int ret; 205 struct cros_ec_dev *ec = to_cros_ec_dev(dev); 206 207 msg = kmalloc(sizeof(*msg) + sizeof(*resp), GFP_KERNEL); 208 if (!msg) 209 return -ENOMEM; 210 211 /* The flash info shouldn't ever change, but ask each time anyway. */ 212 msg->version = 0; 213 msg->command = EC_CMD_FLASH_INFO + ec->cmd_offset; 214 msg->insize = sizeof(*resp); 215 msg->outsize = 0; 216 ret = cros_ec_cmd_xfer_status(ec->ec_dev, msg); 217 if (ret < 0) 218 goto exit; 219 220 resp = (struct ec_response_flash_info *)msg->data; 221 222 ret = sysfs_emit(buf, 223 "FlashSize %d\nWriteSize %d\n" 224 "EraseSize %d\nProtectSize %d\n", 225 resp->flash_size, resp->write_block_size, 226 resp->erase_block_size, resp->protect_block_size); 227 exit: 228 kfree(msg); 229 return ret; 230 } 231 232 /* Keyboard wake angle control */ 233 static ssize_t kb_wake_angle_show(struct device *dev, 234 struct device_attribute *attr, char *buf) 235 { 236 struct cros_ec_dev *ec = to_cros_ec_dev(dev); 237 struct ec_response_motion_sense *resp; 238 struct ec_params_motion_sense *param; 239 struct cros_ec_command *msg; 240 int ret; 241 242 msg = kmalloc(sizeof(*msg) + EC_HOST_PARAM_SIZE, GFP_KERNEL); 243 if (!msg) 244 return -ENOMEM; 245 246 param = (struct ec_params_motion_sense *)msg->data; 247 msg->command = EC_CMD_MOTION_SENSE_CMD + ec->cmd_offset; 248 msg->version = 2; 249 param->cmd = MOTIONSENSE_CMD_KB_WAKE_ANGLE; 250 param->kb_wake_angle.data = EC_MOTION_SENSE_NO_VALUE; 251 msg->outsize = sizeof(*param); 252 msg->insize = sizeof(*resp); 253 254 ret = cros_ec_cmd_xfer_status(ec->ec_dev, msg); 255 if (ret < 0) 256 goto exit; 257 258 resp = (struct ec_response_motion_sense *)msg->data; 259 ret = sysfs_emit(buf, "%d\n", resp->kb_wake_angle.ret); 260 exit: 261 kfree(msg); 262 return ret; 263 } 264 265 static ssize_t kb_wake_angle_store(struct device *dev, 266 struct device_attribute *attr, 267 const char *buf, size_t count) 268 { 269 struct cros_ec_dev *ec = to_cros_ec_dev(dev); 270 struct ec_params_motion_sense *param; 271 struct cros_ec_command *msg; 272 u16 angle; 273 int ret; 274 275 ret = kstrtou16(buf, 0, &angle); 276 if (ret) 277 return ret; 278 279 msg = kmalloc(sizeof(*msg) + EC_HOST_PARAM_SIZE, GFP_KERNEL); 280 if (!msg) 281 return -ENOMEM; 282 283 param = (struct ec_params_motion_sense *)msg->data; 284 msg->command = EC_CMD_MOTION_SENSE_CMD + ec->cmd_offset; 285 msg->version = 2; 286 param->cmd = MOTIONSENSE_CMD_KB_WAKE_ANGLE; 287 param->kb_wake_angle.data = angle; 288 msg->outsize = sizeof(*param); 289 msg->insize = sizeof(struct ec_response_motion_sense); 290 291 ret = cros_ec_cmd_xfer_status(ec->ec_dev, msg); 292 kfree(msg); 293 if (ret < 0) 294 return ret; 295 return count; 296 } 297 298 /* Module initialization */ 299 300 static DEVICE_ATTR_RW(reboot); 301 static DEVICE_ATTR_RO(version); 302 static DEVICE_ATTR_RO(flashinfo); 303 static DEVICE_ATTR_RW(kb_wake_angle); 304 305 static struct attribute *__ec_attrs[] = { 306 &dev_attr_kb_wake_angle.attr, 307 &dev_attr_reboot.attr, 308 &dev_attr_version.attr, 309 &dev_attr_flashinfo.attr, 310 NULL, 311 }; 312 313 static umode_t cros_ec_ctrl_visible(struct kobject *kobj, 314 struct attribute *a, int n) 315 { 316 struct device *dev = kobj_to_dev(kobj); 317 struct cros_ec_dev *ec = to_cros_ec_dev(dev); 318 319 if (a == &dev_attr_kb_wake_angle.attr && !ec->has_kb_wake_angle) 320 return 0; 321 322 return a->mode; 323 } 324 325 static const struct attribute_group cros_ec_attr_group = { 326 .attrs = __ec_attrs, 327 .is_visible = cros_ec_ctrl_visible, 328 }; 329 330 static int cros_ec_sysfs_probe(struct platform_device *pd) 331 { 332 struct cros_ec_dev *ec_dev = dev_get_drvdata(pd->dev.parent); 333 struct device *dev = &pd->dev; 334 int ret; 335 336 ret = sysfs_create_group(&ec_dev->class_dev.kobj, &cros_ec_attr_group); 337 if (ret < 0) 338 dev_err(dev, "failed to create attributes. err=%d\n", ret); 339 340 return ret; 341 } 342 343 static int cros_ec_sysfs_remove(struct platform_device *pd) 344 { 345 struct cros_ec_dev *ec_dev = dev_get_drvdata(pd->dev.parent); 346 347 sysfs_remove_group(&ec_dev->class_dev.kobj, &cros_ec_attr_group); 348 349 return 0; 350 } 351 352 static struct platform_driver cros_ec_sysfs_driver = { 353 .driver = { 354 .name = DRV_NAME, 355 }, 356 .probe = cros_ec_sysfs_probe, 357 .remove = cros_ec_sysfs_remove, 358 }; 359 360 module_platform_driver(cros_ec_sysfs_driver); 361 362 MODULE_LICENSE("GPL"); 363 MODULE_DESCRIPTION("Expose the ChromeOS EC through sysfs"); 364 MODULE_ALIAS("platform:" DRV_NAME); 365