summaryrefslogtreecommitdiffstats
path: root/drivers/platform/chrome/wilco_ec/sysfs.c
blob: d44c435596213f694ab52c59d24563a307c125a8 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
// SPDX-License-Identifier: GPL-2.0
/*
 * Copyright 2019 Google LLC
 *
 * Sysfs properties to view and modify EC-controlled features on Wilco devices.
 * The entries will appear under /sys/bus/platform/devices/GOOG000C:00/
 *
 * See Documentation/ABI/testing/sysfs-platform-wilco-ec for more information.
 */

#include <linux/device.h>
#include <linux/kernel.h>
#include <linux/platform_data/wilco-ec.h>
#include <linux/string.h>
#include <linux/sysfs.h>
#include <linux/types.h>

#define CMD_KB_CMOS			0x7C
#define SUB_CMD_KB_CMOS_AUTO_ON		0x03

struct boot_on_ac_request {
	u8 cmd;			/* Always CMD_KB_CMOS */
	u8 reserved1;
	u8 sub_cmd;		/* Always SUB_CMD_KB_CMOS_AUTO_ON */
	u8 reserved3to5[3];
	u8 val;			/* Either 0 or 1 */
	u8 reserved7;
} __packed;

#define CMD_USB_CHARGE 0x39

enum usb_charge_op {
	USB_CHARGE_GET = 0,
	USB_CHARGE_SET = 1,
};

struct usb_charge_request {
	u8 cmd;		/* Always CMD_USB_CHARGE */
	u8 reserved;
	u8 op;		/* One of enum usb_charge_op */
	u8 val;		/* When setting, either 0 or 1 */
} __packed;

struct usb_charge_response {
	u8 reserved;
	u8 status;	/* Set by EC to 0 on success, other value on failure */
	u8 val;		/* When getting, set by EC to either 0 or 1 */
} __packed;

#define CMD_EC_INFO			0x38
enum get_ec_info_op {
	CMD_GET_EC_LABEL	= 0,
	CMD_GET_EC_REV		= 1,
	CMD_GET_EC_MODEL	= 2,
	CMD_GET_EC_BUILD_DATE	= 3,
};

struct get_ec_info_req {
	u8 cmd;			/* Always CMD_EC_INFO */
	u8 reserved;
	u8 op;			/* One of enum get_ec_info_op */
} __packed;

struct get_ec_info_resp {
	u8 reserved[2];
	char value[9]; /* __nonstring: might not be null terminated */
} __packed;

static ssize_t boot_on_ac_store(struct device *dev,
				struct device_attribute *attr,
				const char *buf, size_t count)
{
	struct wilco_ec_device *ec = dev_get_drvdata(dev);
	struct boot_on_ac_request rq;
	struct wilco_ec_message msg;
	int ret;
	u8 val;

	ret = kstrtou8(buf, 10, &val);
	if (ret < 0)
		return ret;
	if (val > 1)
		return -EINVAL;

	memset(&rq, 0, sizeof(rq));
	rq.cmd = CMD_KB_CMOS;
	rq.sub_cmd = SUB_CMD_KB_CMOS_AUTO_ON;
	rq.val = val;

	memset(&msg, 0, sizeof(msg));
	msg.type = WILCO_EC_MSG_LEGACY;
	msg.request_data = &rq;
	msg.request_size = sizeof(rq);
	ret = wilco_ec_mailbox(ec, &msg);
	if (ret < 0)
		return ret;

	return count;
}

static DEVICE_ATTR_WO(boot_on_ac);

static ssize_t get_info(struct device *dev, char *buf, enum get_ec_info_op op)
{
	struct wilco_ec_device *ec = dev_get_drvdata(dev);
	struct get_ec_info_req req = { .cmd = CMD_EC_INFO, .op = op };
	struct get_ec_info_resp resp;
	int ret;

	struct wilco_ec_message msg = {
		.type = WILCO_EC_MSG_LEGACY,
		.request_data = &req,
		.request_size = sizeof(req),
		.response_data = &resp,
		.response_size = sizeof(resp),
	};

	ret = wilco_ec_mailbox(ec, &msg);
	if (ret < 0)
		return ret;

	return sysfs_emit(buf, "%.*s\n", (int)sizeof(resp.value), (char *)&resp.value);
}

static ssize_t version_show(struct device *dev, struct device_attribute *attr,
			  char *buf)
{
	return get_info(dev, buf, CMD_GET_EC_LABEL);
}

static DEVICE_ATTR_RO(version);

static ssize_t build_revision_show(struct device *dev,
				   struct device_attribute *attr, char *buf)
{
	return get_info(dev, buf, CMD_GET_EC_REV);
}

static DEVICE_ATTR_RO(build_revision);

static ssize_t build_date_show(struct device *dev,
			       struct device_attribute *attr, char *buf)
{
	return get_info(dev, buf, CMD_GET_EC_BUILD_DATE);
}

static DEVICE_ATTR_RO(build_date);

static ssize_t model_number_show(struct device *dev,
				 struct device_attribute *attr, char *buf)
{
	return get_info(dev, buf, CMD_GET_EC_MODEL);
}

static DEVICE_ATTR_RO(model_number);

static int send_usb_charge(struct wilco_ec_device *ec,
				struct usb_charge_request *rq,
				struct usb_charge_response *rs)
{
	struct wilco_ec_message msg;
	int ret;

	memset(&msg, 0, sizeof(msg));
	msg.type = WILCO_EC_MSG_LEGACY;
	msg.request_data = rq;
	msg.request_size = sizeof(*rq);
	msg.response_data = rs;
	msg.response_size = sizeof(*rs);
	ret = wilco_ec_mailbox(ec, &msg);
	if (ret < 0)
		return ret;
	if (rs->status)
		return -EIO;

	return 0;
}

static ssize_t usb_charge_show(struct device *dev,
				    struct device_attribute *attr, char *buf)
{
	struct wilco_ec_device *ec = dev_get_drvdata(dev);
	struct usb_charge_request rq;
	struct usb_charge_response rs;
	int ret;

	memset(&rq, 0, sizeof(rq));
	rq.cmd = CMD_USB_CHARGE;
	rq.op = USB_CHARGE_GET;

	ret = send_usb_charge(ec, &rq, &rs);
	if (ret < 0)
		return ret;

	return sysfs_emit(buf, "%d\n", rs.val);
}

static ssize_t usb_charge_store(struct device *dev,
				     struct device_attribute *attr,
				     const char *buf, size_t count)
{
	struct wilco_ec_device *ec = dev_get_drvdata(dev);
	struct usb_charge_request rq;
	struct usb_charge_response rs;
	int ret;
	u8 val;

	ret = kstrtou8(buf, 10, &val);
	if (ret < 0)
		return ret;
	if (val > 1)
		return -EINVAL;

	memset(&rq, 0, sizeof(rq));
	rq.cmd = CMD_USB_CHARGE;
	rq.op = USB_CHARGE_SET;
	rq.val = val;

	ret = send_usb_charge(ec, &rq, &rs);
	if (ret < 0)
		return ret;

	return count;
}

static DEVICE_ATTR_RW(usb_charge);

static struct attribute *wilco_dev_attrs[] = {
	&dev_attr_boot_on_ac.attr,
	&dev_attr_build_date.attr,
	&dev_attr_build_revision.attr,
	&dev_attr_model_number.attr,
	&dev_attr_usb_charge.attr,
	&dev_attr_version.attr,
	NULL,
};

static const struct attribute_group wilco_dev_attr_group = {
	.attrs = wilco_dev_attrs,
};

int wilco_ec_add_sysfs(struct wilco_ec_device *ec)
{
	return sysfs_create_group(&ec->dev->kobj, &wilco_dev_attr_group);
}

void wilco_ec_remove_sysfs(struct wilco_ec_device *ec)
{
	sysfs_remove_group(&ec->dev->kobj, &wilco_dev_attr_group);
}