2 * cros_ec_sysfs - expose the Chrome OS EC through sysfs
4 * Copyright (C) 2014 Google, Inc.
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.
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.
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/>.
20 #define pr_fmt(fmt) "cros_ec_sysfs: " fmt
22 #include <linux/ctype.h>
23 #include <linux/delay.h>
24 #include <linux/device.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>
37 /* Accessor functions */
39 static ssize_t show_ec_reboot(struct device *dev,
40 struct device_attribute *attr, char *buf)
44 count += scnprintf(buf + count, PAGE_SIZE - count,
45 "ro|rw|cancel|cold|disable-jump|hibernate");
46 count += scnprintf(buf + count, PAGE_SIZE - count,
51 static ssize_t store_ec_reboot(struct device *dev,
52 struct device_attribute *attr,
53 const char *buf, size_t count)
56 const char * const str;
60 {"cancel", EC_REBOOT_CANCEL, 0},
61 {"ro", EC_REBOOT_JUMP_RO, 0},
62 {"rw", EC_REBOOT_JUMP_RW, 0},
63 {"cold", EC_REBOOT_COLD, 0},
64 {"disable-jump", EC_REBOOT_DISABLE_JUMP, 0},
65 {"hibernate", EC_REBOOT_HIBERNATE, 0},
66 {"at-shutdown", -1, EC_REBOOT_FLAG_ON_AP_SHUTDOWN},
68 struct cros_ec_command *msg;
69 struct ec_params_reboot_ec *param;
70 int got_cmd = 0, offset = 0;
73 struct cros_ec_dev *ec = container_of(dev,
74 struct cros_ec_dev, class_dev);
76 msg = kmalloc(sizeof(*msg) + sizeof(*param), GFP_KERNEL);
80 param = (struct ec_params_reboot_ec *)msg->data;
84 /* Find word to start scanning */
85 while (buf[offset] && isspace(buf[offset]))
90 for (i = 0; i < ARRAY_SIZE(words); i++) {
91 if (!strncasecmp(words[i].str, buf+offset,
92 strlen(words[i].str))) {
94 param->flags |= words[i].flags;
96 param->cmd = words[i].cmd;
103 /* On to the next word, if any */
104 while (buf[offset] && !isspace(buf[offset]))
114 msg->command = EC_CMD_REBOOT_EC + ec->cmd_offset;
115 msg->outsize = sizeof(*param);
117 ret = cros_ec_cmd_xfer(ec->ec_dev, msg);
122 if (msg->result != EC_RES_SUCCESS) {
123 dev_dbg(ec->dev, "EC result %d\n", msg->result);
131 static ssize_t show_ec_version(struct device *dev,
132 struct device_attribute *attr, char *buf)
134 static const char * const image_names[] = {"unknown", "RO", "RW"};
135 struct ec_response_get_version *r_ver;
136 struct ec_response_get_chip_info *r_chip;
137 struct ec_response_board_version *r_board;
138 struct cros_ec_command *msg;
141 struct cros_ec_dev *ec = container_of(dev,
142 struct cros_ec_dev, class_dev);
144 msg = kmalloc(sizeof(*msg) + EC_HOST_PARAM_SIZE, GFP_KERNEL);
148 /* Get versions. RW may change. */
150 msg->command = EC_CMD_GET_VERSION + ec->cmd_offset;
151 msg->insize = sizeof(*r_ver);
153 ret = cros_ec_cmd_xfer(ec->ec_dev, msg);
158 if (msg->result != EC_RES_SUCCESS) {
159 count = scnprintf(buf, PAGE_SIZE,
160 "ERROR: EC returned %d\n", msg->result);
164 r_ver = (struct ec_response_get_version *)msg->data;
165 /* Strings should be null-terminated, but let's be sure. */
166 r_ver->version_string_ro[sizeof(r_ver->version_string_ro) - 1] = '\0';
167 r_ver->version_string_rw[sizeof(r_ver->version_string_rw) - 1] = '\0';
168 count += scnprintf(buf + count, PAGE_SIZE - count,
169 "RO version: %s\n", r_ver->version_string_ro);
170 count += scnprintf(buf + count, PAGE_SIZE - count,
171 "RW version: %s\n", r_ver->version_string_rw);
172 count += scnprintf(buf + count, PAGE_SIZE - count,
173 "Firmware copy: %s\n",
174 (r_ver->current_image < ARRAY_SIZE(image_names) ?
175 image_names[r_ver->current_image] : "?"));
177 /* Get build info. */
178 msg->command = EC_CMD_GET_BUILD_INFO + ec->cmd_offset;
179 msg->insize = EC_HOST_PARAM_SIZE;
180 ret = cros_ec_cmd_xfer(ec->ec_dev, msg);
182 count += scnprintf(buf + count, PAGE_SIZE - count,
183 "Build info: XFER ERROR %d\n", ret);
184 else if (msg->result != EC_RES_SUCCESS)
185 count += scnprintf(buf + count, PAGE_SIZE - count,
186 "Build info: EC error %d\n", msg->result);
188 msg->data[sizeof(msg->data) - 1] = '\0';
189 count += scnprintf(buf + count, PAGE_SIZE - count,
190 "Build info: %s\n", msg->data);
194 msg->command = EC_CMD_GET_CHIP_INFO + ec->cmd_offset;
195 msg->insize = sizeof(*r_chip);
196 ret = cros_ec_cmd_xfer(ec->ec_dev, msg);
198 count += scnprintf(buf + count, PAGE_SIZE - count,
199 "Chip info: XFER ERROR %d\n", ret);
200 else if (msg->result != EC_RES_SUCCESS)
201 count += scnprintf(buf + count, PAGE_SIZE - count,
202 "Chip info: EC error %d\n", msg->result);
204 r_chip = (struct ec_response_get_chip_info *)msg->data;
206 r_chip->vendor[sizeof(r_chip->vendor) - 1] = '\0';
207 r_chip->name[sizeof(r_chip->name) - 1] = '\0';
208 r_chip->revision[sizeof(r_chip->revision) - 1] = '\0';
209 count += scnprintf(buf + count, PAGE_SIZE - count,
210 "Chip vendor: %s\n", r_chip->vendor);
211 count += scnprintf(buf + count, PAGE_SIZE - count,
212 "Chip name: %s\n", r_chip->name);
213 count += scnprintf(buf + count, PAGE_SIZE - count,
214 "Chip revision: %s\n", r_chip->revision);
217 /* Get board version */
218 msg->command = EC_CMD_GET_BOARD_VERSION + ec->cmd_offset;
219 msg->insize = sizeof(*r_board);
220 ret = cros_ec_cmd_xfer(ec->ec_dev, msg);
222 count += scnprintf(buf + count, PAGE_SIZE - count,
223 "Board version: XFER ERROR %d\n", ret);
224 else if (msg->result != EC_RES_SUCCESS)
225 count += scnprintf(buf + count, PAGE_SIZE - count,
226 "Board version: EC error %d\n", msg->result);
228 r_board = (struct ec_response_board_version *)msg->data;
230 count += scnprintf(buf + count, PAGE_SIZE - count,
231 "Board version: %d\n",
232 r_board->board_version);
240 static ssize_t show_ec_flashinfo(struct device *dev,
241 struct device_attribute *attr, char *buf)
243 struct ec_response_flash_info *resp;
244 struct cros_ec_command *msg;
246 struct cros_ec_dev *ec = container_of(dev,
247 struct cros_ec_dev, class_dev);
249 msg = kmalloc(sizeof(*msg) + sizeof(*resp), GFP_KERNEL);
253 /* The flash info shouldn't ever change, but ask each time anyway. */
255 msg->command = EC_CMD_FLASH_INFO + ec->cmd_offset;
256 msg->insize = sizeof(*resp);
258 ret = cros_ec_cmd_xfer(ec->ec_dev, msg);
261 if (msg->result != EC_RES_SUCCESS) {
262 ret = scnprintf(buf, PAGE_SIZE,
263 "ERROR: EC returned %d\n", msg->result);
267 resp = (struct ec_response_flash_info *)msg->data;
269 ret = scnprintf(buf, PAGE_SIZE,
270 "FlashSize %d\nWriteSize %d\n"
271 "EraseSize %d\nProtectSize %d\n",
272 resp->flash_size, resp->write_block_size,
273 resp->erase_block_size, resp->protect_block_size);
279 /* Module initialization */
281 static DEVICE_ATTR(reboot, S_IWUSR | S_IRUGO, show_ec_reboot, store_ec_reboot);
282 static DEVICE_ATTR(version, S_IRUGO, show_ec_version, NULL);
283 static DEVICE_ATTR(flashinfo, S_IRUGO, show_ec_flashinfo, NULL);
285 static struct attribute *__ec_attrs[] = {
286 &dev_attr_reboot.attr,
287 &dev_attr_version.attr,
288 &dev_attr_flashinfo.attr,
292 struct attribute_group cros_ec_attr_group = {
295 EXPORT_SYMBOL(cros_ec_attr_group);
297 MODULE_LICENSE("GPL");
298 MODULE_DESCRIPTION("ChromeOS EC control driver");