drivers/misc/cros_ec_lpc.c

1 // SPDX-License-Identifier: GPL-2.0+
3  * Chromium OS cros_ec driver - LPC interface
9  * The Matrix Keyboard Protocol driver handles talking to the keyboard
10  * controller chip. Mostly this is for keyboard functions, but some other
36 			return -1;  in wait_for_sync()
50 		return log_msg_ret("Cannot send that many bytes\n", -E2BIG);  in cros_ec_lpc_packet()
53 		return log_msg_ret("Cannot receive that many bytes\n", -E2BIG);  in cros_ec_lpc_packet()
56 		return log_msg_ret("Timeout waiting ready\n", -ETIMEDOUT);  in cros_ec_lpc_packet()
59 	for (i = 0, d = (uint8_t *)dev->dout; i < out_bytes; i++, d++)  in cros_ec_lpc_packet()
66 		return log_msg_ret("Timeout waiting ready\n", -ETIMEDOUT);  in cros_ec_lpc_packet()
69 	for (i = 0, d = dev->din; i < in_bytes; i++, d++)  in cros_ec_lpc_packet()
92 		return -1;  in cros_ec_lpc_command()
109 		return -1;  in cros_ec_lpc_command()
128 		return -1;  in cros_ec_lpc_command()
135 		return -i;  in cros_ec_lpc_command()
143 	 * If EC didn't modify args flags, then somehow we sent a new-style  in cros_ec_lpc_command()
149 		return -EC_RES_INVALID_RESPONSE;  in cros_ec_lpc_command()
155 		return -EC_RES_INVALID_RESPONSE;  in cros_ec_lpc_command()
159 	for (i = 0, d = (uint8_t *)dev->din; i < args.data_size; i++, d++) {  in cros_ec_lpc_command()
167 	for (i = 0, d = (uint8_t *)dev->din; i < args.data_size; i++, d++)  in cros_ec_lpc_command()
172 		return -EC_RES_INVALID_CHECKSUM;  in cros_ec_lpc_command()
174 	*dinp = dev->din;  in cros_ec_lpc_command()
185  * @return 0 if ok, -1 on error
200 		return -1;  in cros_ec_lpc_init()
209  * The cheapest way to do this is by looking for the memory-mapped
210  * flag.  This is faster than sending a new-style 'hello' command and
226 	return -1;  in cros_ec_lpc_check_version()
241 	{ .compatible = "google,cros-ec-lpc" },