7  * The Wilco EC is similar to a typical ChromeOS embedded controller.
9  * protocol, but with some important differences.  The EC firmware does
21 #include <linux/platform_data/wilco-ec.h>
32 /* Version of EC protocol */
41 /* EC response flags */
43 #define EC_CMDR_PENDING		BIT(1)	/* Write pending to EC */
44 #define EC_CMDR_BUSY		BIT(2)	/* EC is busy processing a command */
48  * wilco_ec_response_timed_out() - Wait for EC response.
49  * @ec: EC device.
51  * Return: true if EC timed out, false if EC did not time out.
53 static bool wilco_ec_response_timed_out(struct wilco_ec_device *ec)  in wilco_ec_response_timed_out()  argument
58 		if (!(inb(ec->io_command->start) &  in wilco_ec_response_timed_out()
87  * wilco_ec_prepare() - Prepare the request structure for the EC.
88  * @msg: EC message with request information.
89  * @rq: EC request structure to fill.
108  * @ec: EC device.
109  * @msg: EC message data for request and response.
112  * Context: ec->mailbox_lock should be held while using this function.
115 static int wilco_ec_transfer(struct wilco_ec_device *ec,  in wilco_ec_transfer()  argument
133 	outb(EC_MAILBOX_START_COMMAND, ec->io_command->start);  in wilco_ec_transfer()
135 	/* For some commands (eg shutdown) the EC will not respond, that's OK */  in wilco_ec_transfer()
137 		dev_dbg(ec->dev, "EC does not respond to this command\n");  in wilco_ec_transfer()
142 	if (wilco_ec_response_timed_out(ec)) {  in wilco_ec_transfer()
143 		dev_dbg(ec->dev, "response timed out\n");  in wilco_ec_transfer()
148 	flag = inb(ec->io_data->start);  in wilco_ec_transfer()
150 		dev_dbg(ec->dev, "bad response: 0x%02x\n", flag);  in wilco_ec_transfer()
155 	rs = ec->data_buffer;  in wilco_ec_transfer()
162 		dev_dbg(ec->dev, "bad packet checksum 0x%02x\n", rs->checksum);  in wilco_ec_transfer()
167 		dev_dbg(ec->dev, "EC reported failure: 0x%02x\n", rs->result);  in wilco_ec_transfer()
172 		dev_dbg(ec->dev, "unexpected packet size (%u != %u)\n",  in wilco_ec_transfer()
178 		dev_dbg(ec->dev, "EC didn't return enough data (%u < %zu)\n",  in wilco_ec_transfer()
189  * wilco_ec_mailbox() - Send EC request and receive EC response.
190  * @ec: EC device.
191  * @msg: EC message data for request and response.
202 int wilco_ec_mailbox(struct wilco_ec_device *ec, struct wilco_ec_message *msg)  in wilco_ec_mailbox()  argument
207 	dev_dbg(ec->dev, "type=%04x flags=%02x rslen=%zu rqlen=%zu\n",  in wilco_ec_mailbox()
210 	mutex_lock(&ec->mailbox_lock);  in wilco_ec_mailbox()
212 	rq = ec->data_buffer;  in wilco_ec_mailbox()
215 	ret = wilco_ec_transfer(ec, msg, rq);  in wilco_ec_mailbox()
216 	mutex_unlock(&ec->mailbox_lock);  in wilco_ec_mailbox()