Merge tag 'platform-drivers-x86-v4.20-1' of git://git.infradead.org/linux-platform...
[sfrench/cifs-2.6.git] / drivers / platform / chrome / cros_ec_sysfs.c
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 /* Accessor functions */
38
39 static ssize_t reboot_show(struct device *dev,
40                            struct device_attribute *attr, char *buf)
41 {
42         int count = 0;
43
44         count += scnprintf(buf + count, PAGE_SIZE - count,
45                            "ro|rw|cancel|cold|disable-jump|hibernate");
46         count += scnprintf(buf + count, PAGE_SIZE - count,
47                            " [at-shutdown]\n");
48         return count;
49 }
50
51 static ssize_t reboot_store(struct device *dev,
52                             struct device_attribute *attr,
53                             const char *buf, size_t count)
54 {
55         static const struct {
56                 const char * const str;
57                 uint8_t cmd;
58                 uint8_t flags;
59         } words[] = {
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},
67         };
68         struct cros_ec_command *msg;
69         struct ec_params_reboot_ec *param;
70         int got_cmd = 0, offset = 0;
71         int i;
72         int ret;
73         struct cros_ec_dev *ec = to_cros_ec_dev(dev);
74
75         msg = kmalloc(sizeof(*msg) + sizeof(*param), GFP_KERNEL);
76         if (!msg)
77                 return -ENOMEM;
78
79         param = (struct ec_params_reboot_ec *)msg->data;
80
81         param->flags = 0;
82         while (1) {
83                 /* Find word to start scanning */
84                 while (buf[offset] && isspace(buf[offset]))
85                         offset++;
86                 if (!buf[offset])
87                         break;
88
89                 for (i = 0; i < ARRAY_SIZE(words); i++) {
90                         if (!strncasecmp(words[i].str, buf+offset,
91                                          strlen(words[i].str))) {
92                                 if (words[i].flags) {
93                                         param->flags |= words[i].flags;
94                                 } else {
95                                         param->cmd = words[i].cmd;
96                                         got_cmd = 1;
97                                 }
98                                 break;
99                         }
100                 }
101
102                 /* On to the next word, if any */
103                 while (buf[offset] && !isspace(buf[offset]))
104                         offset++;
105         }
106
107         if (!got_cmd) {
108                 count = -EINVAL;
109                 goto exit;
110         }
111
112         msg->version = 0;
113         msg->command = EC_CMD_REBOOT_EC + ec->cmd_offset;
114         msg->outsize = sizeof(*param);
115         msg->insize = 0;
116         ret = cros_ec_cmd_xfer_status(ec->ec_dev, msg);
117         if (ret < 0)
118                 count = ret;
119 exit:
120         kfree(msg);
121         return count;
122 }
123
124 static ssize_t version_show(struct device *dev,
125                             struct device_attribute *attr, char *buf)
126 {
127         static const char * const image_names[] = {"unknown", "RO", "RW"};
128         struct ec_response_get_version *r_ver;
129         struct ec_response_get_chip_info *r_chip;
130         struct ec_response_board_version *r_board;
131         struct cros_ec_command *msg;
132         int ret;
133         int count = 0;
134         struct cros_ec_dev *ec = to_cros_ec_dev(dev);
135
136         msg = kmalloc(sizeof(*msg) + EC_HOST_PARAM_SIZE, GFP_KERNEL);
137         if (!msg)
138                 return -ENOMEM;
139
140         /* Get versions. RW may change. */
141         msg->version = 0;
142         msg->command = EC_CMD_GET_VERSION + ec->cmd_offset;
143         msg->insize = sizeof(*r_ver);
144         msg->outsize = 0;
145         ret = cros_ec_cmd_xfer_status(ec->ec_dev, msg);
146         if (ret < 0) {
147                 count = ret;
148                 goto exit;
149         }
150         r_ver = (struct ec_response_get_version *)msg->data;
151         /* Strings should be null-terminated, but let's be sure. */
152         r_ver->version_string_ro[sizeof(r_ver->version_string_ro) - 1] = '\0';
153         r_ver->version_string_rw[sizeof(r_ver->version_string_rw) - 1] = '\0';
154         count += scnprintf(buf + count, PAGE_SIZE - count,
155                            "RO version:    %s\n", r_ver->version_string_ro);
156         count += scnprintf(buf + count, PAGE_SIZE - count,
157                            "RW version:    %s\n", r_ver->version_string_rw);
158         count += scnprintf(buf + count, PAGE_SIZE - count,
159                            "Firmware copy: %s\n",
160                            (r_ver->current_image < ARRAY_SIZE(image_names) ?
161                             image_names[r_ver->current_image] : "?"));
162
163         /* Get build info. */
164         msg->command = EC_CMD_GET_BUILD_INFO + ec->cmd_offset;
165         msg->insize = EC_HOST_PARAM_SIZE;
166         ret = cros_ec_cmd_xfer(ec->ec_dev, msg);
167         if (ret < 0)
168                 count += scnprintf(buf + count, PAGE_SIZE - count,
169                                    "Build info:    XFER ERROR %d\n", ret);
170         else if (msg->result != EC_RES_SUCCESS)
171                 count += scnprintf(buf + count, PAGE_SIZE - count,
172                                    "Build info:    EC error %d\n", msg->result);
173         else {
174                 msg->data[EC_HOST_PARAM_SIZE - 1] = '\0';
175                 count += scnprintf(buf + count, PAGE_SIZE - count,
176                                    "Build info:    %s\n", msg->data);
177         }
178
179         /* Get chip info. */
180         msg->command = EC_CMD_GET_CHIP_INFO + ec->cmd_offset;
181         msg->insize = sizeof(*r_chip);
182         ret = cros_ec_cmd_xfer(ec->ec_dev, msg);
183         if (ret < 0)
184                 count += scnprintf(buf + count, PAGE_SIZE - count,
185                                    "Chip info:     XFER ERROR %d\n", ret);
186         else if (msg->result != EC_RES_SUCCESS)
187                 count += scnprintf(buf + count, PAGE_SIZE - count,
188                                    "Chip info:     EC error %d\n", msg->result);
189         else {
190                 r_chip = (struct ec_response_get_chip_info *)msg->data;
191
192                 r_chip->vendor[sizeof(r_chip->vendor) - 1] = '\0';
193                 r_chip->name[sizeof(r_chip->name) - 1] = '\0';
194                 r_chip->revision[sizeof(r_chip->revision) - 1] = '\0';
195                 count += scnprintf(buf + count, PAGE_SIZE - count,
196                                    "Chip vendor:   %s\n", r_chip->vendor);
197                 count += scnprintf(buf + count, PAGE_SIZE - count,
198                                    "Chip name:     %s\n", r_chip->name);
199                 count += scnprintf(buf + count, PAGE_SIZE - count,
200                                    "Chip revision: %s\n", r_chip->revision);
201         }
202
203         /* Get board version */
204         msg->command = EC_CMD_GET_BOARD_VERSION + ec->cmd_offset;
205         msg->insize = sizeof(*r_board);
206         ret = cros_ec_cmd_xfer(ec->ec_dev, msg);
207         if (ret < 0)
208                 count += scnprintf(buf + count, PAGE_SIZE - count,
209                                    "Board version: XFER ERROR %d\n", ret);
210         else if (msg->result != EC_RES_SUCCESS)
211                 count += scnprintf(buf + count, PAGE_SIZE - count,
212                                    "Board version: EC error %d\n", msg->result);
213         else {
214                 r_board = (struct ec_response_board_version *)msg->data;
215
216                 count += scnprintf(buf + count, PAGE_SIZE - count,
217                                    "Board version: %d\n",
218                                    r_board->board_version);
219         }
220
221 exit:
222         kfree(msg);
223         return count;
224 }
225
226 static ssize_t flashinfo_show(struct device *dev,
227                               struct device_attribute *attr, char *buf)
228 {
229         struct ec_response_flash_info *resp;
230         struct cros_ec_command *msg;
231         int ret;
232         struct cros_ec_dev *ec = to_cros_ec_dev(dev);
233
234         msg = kmalloc(sizeof(*msg) + sizeof(*resp), GFP_KERNEL);
235         if (!msg)
236                 return -ENOMEM;
237
238         /* The flash info shouldn't ever change, but ask each time anyway. */
239         msg->version = 0;
240         msg->command = EC_CMD_FLASH_INFO + ec->cmd_offset;
241         msg->insize = sizeof(*resp);
242         msg->outsize = 0;
243         ret = cros_ec_cmd_xfer_status(ec->ec_dev, msg);
244         if (ret < 0)
245                 goto exit;
246
247         resp = (struct ec_response_flash_info *)msg->data;
248
249         ret = scnprintf(buf, PAGE_SIZE,
250                         "FlashSize %d\nWriteSize %d\n"
251                         "EraseSize %d\nProtectSize %d\n",
252                         resp->flash_size, resp->write_block_size,
253                         resp->erase_block_size, resp->protect_block_size);
254 exit:
255         kfree(msg);
256         return ret;
257 }
258
259 /* Keyboard wake angle control */
260 static ssize_t kb_wake_angle_show(struct device *dev,
261                                   struct device_attribute *attr, char *buf)
262 {
263         struct cros_ec_dev *ec = to_cros_ec_dev(dev);
264         struct ec_response_motion_sense *resp;
265         struct ec_params_motion_sense *param;
266         struct cros_ec_command *msg;
267         int ret;
268
269         msg = kmalloc(sizeof(*msg) + EC_HOST_PARAM_SIZE, GFP_KERNEL);
270         if (!msg)
271                 return -ENOMEM;
272
273         param = (struct ec_params_motion_sense *)msg->data;
274         msg->command = EC_CMD_MOTION_SENSE_CMD + ec->cmd_offset;
275         msg->version = 2;
276         param->cmd = MOTIONSENSE_CMD_KB_WAKE_ANGLE;
277         param->kb_wake_angle.data = EC_MOTION_SENSE_NO_VALUE;
278         msg->outsize = sizeof(*param);
279         msg->insize = sizeof(*resp);
280
281         ret = cros_ec_cmd_xfer_status(ec->ec_dev, msg);
282         if (ret < 0)
283                 goto exit;
284
285         resp = (struct ec_response_motion_sense *)msg->data;
286         ret = scnprintf(buf, PAGE_SIZE, "%d\n", resp->kb_wake_angle.ret);
287 exit:
288         kfree(msg);
289         return ret;
290 }
291
292 static ssize_t kb_wake_angle_store(struct device *dev,
293                                    struct device_attribute *attr,
294                                    const char *buf, size_t count)
295 {
296         struct cros_ec_dev *ec = to_cros_ec_dev(dev);
297         struct ec_params_motion_sense *param;
298         struct cros_ec_command *msg;
299         u16 angle;
300         int ret;
301
302         ret = kstrtou16(buf, 0, &angle);
303         if (ret)
304                 return ret;
305
306         msg = kmalloc(sizeof(*msg) + EC_HOST_PARAM_SIZE, GFP_KERNEL);
307         if (!msg)
308                 return -ENOMEM;
309
310         param = (struct ec_params_motion_sense *)msg->data;
311         msg->command = EC_CMD_MOTION_SENSE_CMD + ec->cmd_offset;
312         msg->version = 2;
313         param->cmd = MOTIONSENSE_CMD_KB_WAKE_ANGLE;
314         param->kb_wake_angle.data = angle;
315         msg->outsize = sizeof(*param);
316         msg->insize = sizeof(struct ec_response_motion_sense);
317
318         ret = cros_ec_cmd_xfer_status(ec->ec_dev, msg);
319         kfree(msg);
320         if (ret < 0)
321                 return ret;
322         return count;
323 }
324
325 /* Module initialization */
326
327 static DEVICE_ATTR_RW(reboot);
328 static DEVICE_ATTR_RO(version);
329 static DEVICE_ATTR_RO(flashinfo);
330 static DEVICE_ATTR_RW(kb_wake_angle);
331
332 static struct attribute *__ec_attrs[] = {
333         &dev_attr_kb_wake_angle.attr,
334         &dev_attr_reboot.attr,
335         &dev_attr_version.attr,
336         &dev_attr_flashinfo.attr,
337         NULL,
338 };
339
340 static umode_t cros_ec_ctrl_visible(struct kobject *kobj,
341                                     struct attribute *a, int n)
342 {
343         struct device *dev = container_of(kobj, struct device, kobj);
344         struct cros_ec_dev *ec = to_cros_ec_dev(dev);
345
346         if (a == &dev_attr_kb_wake_angle.attr && !ec->has_kb_wake_angle)
347                 return 0;
348
349         return a->mode;
350 }
351
352 struct attribute_group cros_ec_attr_group = {
353         .attrs = __ec_attrs,
354         .is_visible = cros_ec_ctrl_visible,
355 };
356 EXPORT_SYMBOL(cros_ec_attr_group);
357
358 MODULE_LICENSE("GPL");
359 MODULE_DESCRIPTION("ChromeOS EC control driver");