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Message-ID: <20140703072924.GC30534@lee--X1>
Date: Thu, 3 Jul 2014 08:29:24 +0100
From: Lee Jones <lee.jones@...aro.org>
To: Doug Anderson <dianders@...omium.org>
Cc: Andrew Bresticker <abrestic@...omium.org>, swarren@...dotorg.org,
olof@...om.net, Sonny Rao <sonnyrao@...omium.org>,
linux-samsung-soc@...r.kernel.org,
Javier Martinez Canillas <javier.martinez@...labora.co.uk>,
Bill Richardson <wfrichar@...omium.org>, sjg@...omium.org,
Wolfram Sang <wsa@...-dreams.de>, broonie@...nel.org,
sameo@...ux.intel.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 05/10] mfd: cros_ec: Use struct cros_ec_command to
communicate with the EC
On Wed, 18 Jun 2014, Doug Anderson wrote:
> From: Bill Richardson <wfrichar@...omium.org>
>
> This is some internal structure reorganization / renaming to prepare
> for future patches that will add a userspace API to cros_ec. There
> should be no visible changes.
>
> Signed-off-by: Bill Richardson <wfrichar@...omium.org>
> Signed-off-by: Doug Anderson <dianders@...omium.org>
> Acked-by: Lee Jones <lee.jones@...aro.org>
> ---
> Changes in v2: None
>
> drivers/mfd/cros_ec.c | 28 ++++++++++++++--------------
> drivers/mfd/cros_ec_i2c.c | 24 ++++++++++++------------
> drivers/mfd/cros_ec_spi.c | 16 ++++++++--------
> include/linux/mfd/cros_ec.h | 35 ++++++++++++++++++-----------------
> 4 files changed, 52 insertions(+), 51 deletions(-)
Patch applied with Simon's Reviewed-by.
Clause: There is a chance that this patch might not be seen in -next
for ~24-48hrs. If it's not there by 72hrs, feel free to poke.
> diff --git a/drivers/mfd/cros_ec.c b/drivers/mfd/cros_ec.c
> index 04e053c..2e86c28 100644
> --- a/drivers/mfd/cros_ec.c
> +++ b/drivers/mfd/cros_ec.c
> @@ -25,22 +25,22 @@
> #include <linux/mfd/cros_ec_commands.h>
>
> int cros_ec_prepare_tx(struct cros_ec_device *ec_dev,
> - struct cros_ec_msg *msg)
> + struct cros_ec_command *msg)
> {
> uint8_t *out;
> int csum, i;
>
> - BUG_ON(msg->out_len > EC_PROTO2_MAX_PARAM_SIZE);
> + BUG_ON(msg->outsize > EC_PROTO2_MAX_PARAM_SIZE);
> out = ec_dev->dout;
> out[0] = EC_CMD_VERSION0 + msg->version;
> - out[1] = msg->cmd;
> - out[2] = msg->out_len;
> + out[1] = msg->command;
> + out[2] = msg->outsize;
> csum = out[0] + out[1] + out[2];
> - for (i = 0; i < msg->out_len; i++)
> - csum += out[EC_MSG_TX_HEADER_BYTES + i] = msg->out_buf[i];
> - out[EC_MSG_TX_HEADER_BYTES + msg->out_len] = (uint8_t)(csum & 0xff);
> + for (i = 0; i < msg->outsize; i++)
> + csum += out[EC_MSG_TX_HEADER_BYTES + i] = msg->outdata[i];
> + out[EC_MSG_TX_HEADER_BYTES + msg->outsize] = (uint8_t)(csum & 0xff);
>
> - return EC_MSG_TX_PROTO_BYTES + msg->out_len;
> + return EC_MSG_TX_PROTO_BYTES + msg->outsize;
> }
> EXPORT_SYMBOL(cros_ec_prepare_tx);
>
> @@ -48,14 +48,14 @@ static int cros_ec_command_sendrecv(struct cros_ec_device *ec_dev,
> uint16_t cmd, void *out_buf, int out_len,
> void *in_buf, int in_len)
> {
> - struct cros_ec_msg msg;
> + struct cros_ec_command msg;
>
> msg.version = cmd >> 8;
> - msg.cmd = cmd & 0xff;
> - msg.out_buf = out_buf;
> - msg.out_len = out_len;
> - msg.in_buf = in_buf;
> - msg.in_len = in_len;
> + msg.command = cmd & 0xff;
> + msg.outdata = out_buf;
> + msg.outsize = out_len;
> + msg.indata = in_buf;
> + msg.insize = in_len;
>
> return ec_dev->cmd_xfer(ec_dev, &msg);
> }
> diff --git a/drivers/mfd/cros_ec_i2c.c b/drivers/mfd/cros_ec_i2c.c
> index 777e529..37ed12f 100644
> --- a/drivers/mfd/cros_ec_i2c.c
> +++ b/drivers/mfd/cros_ec_i2c.c
> @@ -30,7 +30,7 @@ static inline struct cros_ec_device *to_ec_dev(struct device *dev)
> }
>
> static int cros_ec_cmd_xfer_i2c(struct cros_ec_device *ec_dev,
> - struct cros_ec_msg *msg)
> + struct cros_ec_command *msg)
> {
> struct i2c_client *client = ec_dev->priv;
> int ret = -ENOMEM;
> @@ -50,7 +50,7 @@ static int cros_ec_cmd_xfer_i2c(struct cros_ec_device *ec_dev,
> * allocate larger packet (one byte for checksum, one byte for
> * length, and one for result code)
> */
> - packet_len = msg->in_len + 3;
> + packet_len = msg->insize + 3;
> in_buf = kzalloc(packet_len, GFP_KERNEL);
> if (!in_buf)
> goto done;
> @@ -61,7 +61,7 @@ static int cros_ec_cmd_xfer_i2c(struct cros_ec_device *ec_dev,
> * allocate larger packet (one byte for checksum, one for
> * command code, one for length, and one for command version)
> */
> - packet_len = msg->out_len + 4;
> + packet_len = msg->outsize + 4;
> out_buf = kzalloc(packet_len, GFP_KERNEL);
> if (!out_buf)
> goto done;
> @@ -69,16 +69,16 @@ static int cros_ec_cmd_xfer_i2c(struct cros_ec_device *ec_dev,
> i2c_msg[0].buf = (char *)out_buf;
>
> out_buf[0] = EC_CMD_VERSION0 + msg->version;
> - out_buf[1] = msg->cmd;
> - out_buf[2] = msg->out_len;
> + out_buf[1] = msg->command;
> + out_buf[2] = msg->outsize;
>
> /* copy message payload and compute checksum */
> sum = out_buf[0] + out_buf[1] + out_buf[2];
> - for (i = 0; i < msg->out_len; i++) {
> - out_buf[3 + i] = msg->out_buf[i];
> + for (i = 0; i < msg->outsize; i++) {
> + out_buf[3 + i] = msg->outdata[i];
> sum += out_buf[3 + i];
> }
> - out_buf[3 + msg->out_len] = sum;
> + out_buf[3 + msg->outsize] = sum;
>
> /* send command to EC and read answer */
> ret = i2c_transfer(client->adapter, i2c_msg, 2);
> @@ -94,20 +94,20 @@ static int cros_ec_cmd_xfer_i2c(struct cros_ec_device *ec_dev,
> /* check response error code */
> if (i2c_msg[1].buf[0]) {
> dev_warn(ec_dev->dev, "command 0x%02x returned an error %d\n",
> - msg->cmd, i2c_msg[1].buf[0]);
> + msg->command, i2c_msg[1].buf[0]);
> ret = -EINVAL;
> goto done;
> }
>
> /* copy response packet payload and compute checksum */
> sum = in_buf[0] + in_buf[1];
> - for (i = 0; i < msg->in_len; i++) {
> - msg->in_buf[i] = in_buf[2 + i];
> + for (i = 0; i < msg->insize; i++) {
> + msg->indata[i] = in_buf[2 + i];
> sum += in_buf[2 + i];
> }
> dev_dbg(ec_dev->dev, "packet: %*ph, sum = %02x\n",
> i2c_msg[1].len, in_buf, sum);
> - if (sum != in_buf[2 + msg->in_len]) {
> + if (sum != in_buf[2 + msg->insize]) {
> dev_err(ec_dev->dev, "bad packet checksum\n");
> ret = -EBADMSG;
> goto done;
> diff --git a/drivers/mfd/cros_ec_spi.c b/drivers/mfd/cros_ec_spi.c
> index c29a2d7..2d713fe 100644
> --- a/drivers/mfd/cros_ec_spi.c
> +++ b/drivers/mfd/cros_ec_spi.c
> @@ -216,7 +216,7 @@ static int cros_ec_spi_receive_response(struct cros_ec_device *ec_dev,
> * @ec_msg: Message to transfer
> */
> static int cros_ec_cmd_xfer_spi(struct cros_ec_device *ec_dev,
> - struct cros_ec_msg *ec_msg)
> + struct cros_ec_command *ec_msg)
> {
> struct cros_ec_spi *ec_spi = ec_dev->priv;
> struct spi_transfer trans;
> @@ -261,7 +261,7 @@ static int cros_ec_cmd_xfer_spi(struct cros_ec_device *ec_dev,
> /* Get the response */
> if (!ret) {
> ret = cros_ec_spi_receive_response(ec_dev,
> - ec_msg->in_len + EC_MSG_TX_PROTO_BYTES);
> + ec_msg->insize + EC_MSG_TX_PROTO_BYTES);
> } else {
> dev_err(ec_dev->dev, "spi transfer failed: %d\n", ret);
> }
> @@ -294,21 +294,21 @@ static int cros_ec_cmd_xfer_spi(struct cros_ec_device *ec_dev,
> if (ptr[0]) {
> if (ptr[0] == EC_RES_IN_PROGRESS) {
> dev_dbg(ec_dev->dev, "command 0x%02x in progress\n",
> - ec_msg->cmd);
> + ec_msg->command);
> ret = -EAGAIN;
> goto exit;
> }
> dev_warn(ec_dev->dev, "command 0x%02x returned an error %d\n",
> - ec_msg->cmd, ptr[0]);
> + ec_msg->command, ptr[0]);
> debug_packet(ec_dev->dev, "in_err", ptr, len);
> ret = -EINVAL;
> goto exit;
> }
> len = ptr[1];
> sum = ptr[0] + ptr[1];
> - if (len > ec_msg->in_len) {
> + if (len > ec_msg->insize) {
> dev_err(ec_dev->dev, "packet too long (%d bytes, expected %d)",
> - len, ec_msg->in_len);
> + len, ec_msg->insize);
> ret = -ENOSPC;
> goto exit;
> }
> @@ -316,8 +316,8 @@ static int cros_ec_cmd_xfer_spi(struct cros_ec_device *ec_dev,
> /* copy response packet payload and compute checksum */
> for (i = 0; i < len; i++) {
> sum += ptr[i + 2];
> - if (ec_msg->in_len)
> - ec_msg->in_buf[i] = ptr[i + 2];
> + if (ec_msg->insize)
> + ec_msg->indata[i] = ptr[i + 2];
> }
> sum &= 0xff;
>
> diff --git a/include/linux/mfd/cros_ec.h b/include/linux/mfd/cros_ec.h
> index 79a3585..f27c037 100644
> --- a/include/linux/mfd/cros_ec.h
> +++ b/include/linux/mfd/cros_ec.h
> @@ -35,23 +35,23 @@ enum {
> EC_MSG_TX_PROTO_BYTES,
> };
>
> -/**
> - * struct cros_ec_msg - A message sent to the EC, and its reply
> - *
> +/*
> * @version: Command version number (often 0)
> - * @cmd: Command to send (EC_CMD_...)
> - * @out_buf: Outgoing payload (to EC)
> - * @outlen: Outgoing length
> - * @in_buf: Incoming payload (from EC)
> - * @in_len: Incoming length
> + * @command: Command to send (EC_CMD_...)
> + * @outdata: Outgoing data to EC
> + * @outsize: Outgoing length in bytes
> + * @indata: Where to put the incoming data from EC
> + * @insize: Incoming length in bytes (filled in by EC)
> + * @result: EC's response to the command (separate from communication failure)
> */
> -struct cros_ec_msg {
> - u8 version;
> - u8 cmd;
> - uint8_t *out_buf;
> - int out_len;
> - uint8_t *in_buf;
> - int in_len;
> +struct cros_ec_command {
> + uint32_t version;
> + uint32_t command;
> + uint8_t *outdata;
> + uint32_t outsize;
> + uint8_t *indata;
> + uint32_t insize;
> + uint32_t result;
> };
>
> /**
> @@ -114,7 +114,8 @@ struct cros_ec_device {
> struct device *parent;
> bool wake_enabled;
> struct mutex lock;
> - int (*cmd_xfer)(struct cros_ec_device *ec, struct cros_ec_msg *msg);
> + int (*cmd_xfer)(struct cros_ec_device *ec,
> + struct cros_ec_command *msg);
> };
>
> /**
> @@ -148,7 +149,7 @@ int cros_ec_resume(struct cros_ec_device *ec_dev);
> * @msg: Message to write
> */
> int cros_ec_prepare_tx(struct cros_ec_device *ec_dev,
> - struct cros_ec_msg *msg);
> + struct cros_ec_command *msg);
>
> /**
> * cros_ec_remove - Remove a ChromeOS EC
--
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
Follow Linaro: Facebook | Twitter | Blog
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