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mfd: cros_ec: add bus-specific proto v3 code

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Add proto v3 support to the SPI, I2C, and LPC.

Signed-off-by: Stephen Barber <smbarber@chromium.org>
Signed-off-by: Javier Martinez Canillas <javier.martinez@collabora.co.uk>
Tested-by: Heiko Stuebner <heiko@sntech.de>
Reviewed-by: Gwendal Grignou <gwendal@chromium.org>
Tested-by: Gwendal Grignou <gwendal@chromium.org>
Acked-by: Lee Jones <lee.jones@linaro.org>
Acked-by: Olof Johansson <olof@lixom.net>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
This commit is contained in:
Stephen Barber
2015-06-09 13:04:46 +02:00
committed by Lee Jones
parent 2c7589af3c
commit d365407079
4 changed files with 569 additions and 58 deletions
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73
drivers/platform/chrome/cros_ec_lpc.c
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@@ -46,6 +46,77 @@ static int ec_response_timed_out(void)
return 1;
}
static int cros_ec_pkt_xfer_lpc(struct cros_ec_device *ec,
struct cros_ec_command *msg)
{
struct ec_host_request *request;
struct ec_host_response response;
u8 sum = 0;
int i;
int ret = 0;
u8 *dout;
ret = cros_ec_prepare_tx(ec, msg);
/* Write buffer */
for (i = 0; i < ret; i++)
outb(ec->dout[i], EC_LPC_ADDR_HOST_PACKET + i);
request = (struct ec_host_request *)ec->dout;
/* Here we go */
outb(EC_COMMAND_PROTOCOL_3, EC_LPC_ADDR_HOST_CMD);
if (ec_response_timed_out()) {
dev_warn(ec->dev, "EC responsed timed out\n");
ret = -EIO;
goto done;
}
/* Check result */
msg->result = inb(EC_LPC_ADDR_HOST_DATA);
ret = cros_ec_check_result(ec, msg);
if (ret)
goto done;
/* Read back response */
dout = (u8 *)&response;
for (i = 0; i < sizeof(response); i++) {
dout[i] = inb(EC_LPC_ADDR_HOST_PACKET + i);
sum += dout[i];
}
msg->result = response.result;
if (response.data_len > msg->insize) {
dev_err(ec->dev,
"packet too long (%d bytes, expected %d)",
response.data_len, msg->insize);
ret = -EMSGSIZE;
goto done;
}
/* Read response and process checksum */
for (i = 0; i < response.data_len; i++) {
msg->data[i] =
inb(EC_LPC_ADDR_HOST_PACKET + sizeof(response) + i);
sum += msg->data[i];
}
if (sum) {
dev_err(ec->dev,
"bad packet checksum %02x\n",
response.checksum);
ret = -EBADMSG;
goto done;
}
/* Return actual amount of data received */
ret = response.data_len;
done:
return ret;
}
static int cros_ec_cmd_xfer_lpc(struct cros_ec_device *ec,
struct cros_ec_command *msg)
{
@@ -215,7 +286,7 @@ static int cros_ec_lpc_probe(struct platform_device *pdev)
ec_dev->ec_name = pdev->name;
ec_dev->phys_name = dev_name(dev);
ec_dev->cmd_xfer = cros_ec_cmd_xfer_lpc;
ec_dev->pkt_xfer = NULL;
ec_dev->pkt_xfer = cros_ec_pkt_xfer_lpc;
ec_dev->cmd_readmem = cros_ec_lpc_readmem;
ec_dev->din_size = sizeof(struct ec_host_response) +
sizeof(struct ec_response_get_protocol_info);