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71af4b52 BR |
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 | } |