Lines Matching +full:cros +full:- +full:ec +full:- +full:i2c
1 // SPDX-License-Identifier: GPL-2.0
2 // I2C interface for ChromeOS Embedded Controller
10 #include <linux/i2c.h>
22 * byte 1-8 struct ec_host_request
23 * byte 10- response data
36 * byte 2-9 struct ec_host_response
37 * byte 10- response data
55 struct i2c_client *client = ec_dev->priv; in cros_ec_pkt_xfer_i2c()
56 int ret = -ENOMEM; in cros_ec_pkt_xfer_i2c()
69 i2c_msg[0].addr = client->addr; in cros_ec_pkt_xfer_i2c()
71 i2c_msg[1].addr = client->addr; in cros_ec_pkt_xfer_i2c()
74 packet_len = msg->insize + response_header_size; in cros_ec_pkt_xfer_i2c()
75 BUG_ON(packet_len > ec_dev->din_size); in cros_ec_pkt_xfer_i2c()
76 in_buf = ec_dev->din; in cros_ec_pkt_xfer_i2c()
80 packet_len = msg->outsize + request_header_size; in cros_ec_pkt_xfer_i2c()
81 BUG_ON(packet_len > ec_dev->dout_size); in cros_ec_pkt_xfer_i2c()
82 out_buf = ec_dev->dout; in cros_ec_pkt_xfer_i2c()
88 ec_request_i2c->command_protocol = EC_COMMAND_PROTOCOL_3; in cros_ec_pkt_xfer_i2c()
90 ec_dev->dout++; in cros_ec_pkt_xfer_i2c()
92 ec_dev->dout--; in cros_ec_pkt_xfer_i2c()
94 /* send command to EC and read answer */ in cros_ec_pkt_xfer_i2c()
95 ret = i2c_transfer(client->adapter, i2c_msg, 2); in cros_ec_pkt_xfer_i2c()
97 dev_dbg(ec_dev->dev, "i2c transfer failed: %d\n", ret); in cros_ec_pkt_xfer_i2c()
100 dev_err(ec_dev->dev, "failed to get response: %d\n", ret); in cros_ec_pkt_xfer_i2c()
101 ret = -EIO; in cros_ec_pkt_xfer_i2c()
106 msg->result = ec_response_i2c->result; in cros_ec_pkt_xfer_i2c()
107 ec_response = &ec_response_i2c->ec_response; in cros_ec_pkt_xfer_i2c()
109 switch (msg->result) { in cros_ec_pkt_xfer_i2c()
113 ret = -EAGAIN; in cros_ec_pkt_xfer_i2c()
114 dev_dbg(ec_dev->dev, "command 0x%02x in progress\n", in cros_ec_pkt_xfer_i2c()
115 msg->command); in cros_ec_pkt_xfer_i2c()
119 dev_dbg(ec_dev->dev, "command 0x%02x returned %d\n", in cros_ec_pkt_xfer_i2c()
120 msg->command, msg->result); in cros_ec_pkt_xfer_i2c()
122 * When we send v3 request to v2 ec, ec won't recognize the in cros_ec_pkt_xfer_i2c()
129 if (ec_response_i2c->result == EC_RES_INVALID_COMMAND && in cros_ec_pkt_xfer_i2c()
130 ec_response_i2c->packet_length == 0) { in cros_ec_pkt_xfer_i2c()
131 ret = -EPROTONOSUPPORT; in cros_ec_pkt_xfer_i2c()
136 if (ec_response_i2c->packet_length < sizeof(struct ec_host_response)) { in cros_ec_pkt_xfer_i2c()
137 dev_err(ec_dev->dev, in cros_ec_pkt_xfer_i2c()
139 ec_response_i2c->packet_length); in cros_ec_pkt_xfer_i2c()
140 ret = -EBADMSG; in cros_ec_pkt_xfer_i2c()
144 if (msg->insize < ec_response->data_len) { in cros_ec_pkt_xfer_i2c()
145 dev_err(ec_dev->dev, in cros_ec_pkt_xfer_i2c()
147 msg->insize, in cros_ec_pkt_xfer_i2c()
148 ec_response->data_len); in cros_ec_pkt_xfer_i2c()
149 ret = -EMSGSIZE; in cros_ec_pkt_xfer_i2c()
158 memcpy(msg->data, in cros_ec_pkt_xfer_i2c()
160 ec_response->data_len); in cros_ec_pkt_xfer_i2c()
161 for (i = 0; i < ec_response->data_len; i++) in cros_ec_pkt_xfer_i2c()
162 sum += msg->data[i]; in cros_ec_pkt_xfer_i2c()
166 dev_err(ec_dev->dev, "bad packet checksum\n"); in cros_ec_pkt_xfer_i2c()
167 ret = -EBADMSG; in cros_ec_pkt_xfer_i2c()
171 ret = ec_response->data_len; in cros_ec_pkt_xfer_i2c()
174 if (msg->command == EC_CMD_REBOOT_EC) in cros_ec_pkt_xfer_i2c()
183 struct i2c_client *client = ec_dev->priv; in cros_ec_cmd_xfer_i2c()
184 int ret = -ENOMEM; in cros_ec_cmd_xfer_i2c()
193 i2c_msg[0].addr = client->addr; in cros_ec_cmd_xfer_i2c()
195 i2c_msg[1].addr = client->addr; in cros_ec_cmd_xfer_i2c()
202 packet_len = msg->insize + 3; in cros_ec_cmd_xfer_i2c()
213 packet_len = msg->outsize + 4; in cros_ec_cmd_xfer_i2c()
220 out_buf[0] = EC_CMD_VERSION0 + msg->version; in cros_ec_cmd_xfer_i2c()
221 out_buf[1] = msg->command; in cros_ec_cmd_xfer_i2c()
222 out_buf[2] = msg->outsize; in cros_ec_cmd_xfer_i2c()
226 for (i = 0; i < msg->outsize; i++) { in cros_ec_cmd_xfer_i2c()
227 out_buf[3 + i] = msg->data[i]; in cros_ec_cmd_xfer_i2c()
230 out_buf[3 + msg->outsize] = sum; in cros_ec_cmd_xfer_i2c()
232 /* send command to EC and read answer */ in cros_ec_cmd_xfer_i2c()
233 ret = i2c_transfer(client->adapter, i2c_msg, 2); in cros_ec_cmd_xfer_i2c()
235 dev_err(ec_dev->dev, "i2c transfer failed: %d\n", ret); in cros_ec_cmd_xfer_i2c()
238 dev_err(ec_dev->dev, "failed to get response: %d\n", ret); in cros_ec_cmd_xfer_i2c()
239 ret = -EIO; in cros_ec_cmd_xfer_i2c()
244 msg->result = i2c_msg[1].buf[0]; in cros_ec_cmd_xfer_i2c()
250 if (len > msg->insize) { in cros_ec_cmd_xfer_i2c()
251 dev_err(ec_dev->dev, "packet too long (%d bytes, expected %d)", in cros_ec_cmd_xfer_i2c()
252 len, msg->insize); in cros_ec_cmd_xfer_i2c()
253 ret = -ENOSPC; in cros_ec_cmd_xfer_i2c()
260 msg->data[i] = in_buf[2 + i]; in cros_ec_cmd_xfer_i2c()
263 dev_dbg(ec_dev->dev, "packet: %*ph, sum = %02x\n", in cros_ec_cmd_xfer_i2c()
266 dev_err(ec_dev->dev, "bad packet checksum\n"); in cros_ec_cmd_xfer_i2c()
267 ret = -EBADMSG; in cros_ec_cmd_xfer_i2c()
275 if (msg->command == EC_CMD_REBOOT_EC) in cros_ec_cmd_xfer_i2c()
284 struct device *dev = &client->dev; in cros_ec_i2c_probe()
290 return -ENOMEM; in cros_ec_i2c_probe()
293 ec_dev->dev = dev; in cros_ec_i2c_probe()
294 ec_dev->priv = client; in cros_ec_i2c_probe()
295 ec_dev->irq = client->irq; in cros_ec_i2c_probe()
296 ec_dev->cmd_xfer = cros_ec_cmd_xfer_i2c; in cros_ec_i2c_probe()
297 ec_dev->pkt_xfer = cros_ec_pkt_xfer_i2c; in cros_ec_i2c_probe()
298 ec_dev->phys_name = client->adapter->name; in cros_ec_i2c_probe()
299 ec_dev->din_size = sizeof(struct ec_host_response_i2c) + in cros_ec_i2c_probe()
301 ec_dev->dout_size = sizeof(struct ec_host_request_i2c); in cros_ec_i2c_probe()
305 dev_err(dev, "cannot register EC\n"); in cros_ec_i2c_probe()
341 { .compatible = "google,cros-ec-i2c", },
348 { "cros-ec-i2c", 0 },
351 MODULE_DEVICE_TABLE(i2c, cros_ec_i2c_id);
363 .name = "cros-ec-i2c",
376 MODULE_DESCRIPTION("I2C interface for ChromeOS Embedded Controller");