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mfd: cros_ec: stop calling ->cmd_xfer() directly

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Instead of having users of the ChromeOS EC call the interface-specific
cmd_xfer() callback directly, introduce a central cros_ec_cmd_xfer()
to use instead.  This will allow us to put all the locking and retry
logic in one place instead of duplicating it across the different
drivers.

Signed-off-by: Andrew Bresticker <abrestic@chromium.org>
Reviewed-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Javier Martinez Canillas <javier.martinez@collabora.co.uk>
Reviewed-by: Doug Anderson <dianders@chromium.org>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
This commit is contained in:
Andrew Bresticker 2014-09-18 17:18:56 +02:00 committed by Lee Jones
parent 659e142be0
commit a6551a76ff
4 changed files with 27 additions and 8 deletions
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2
drivers/i2c/busses/i2c-cros-ec-tunnel.c
View File

@ -227,7 +227,7 @@ static int ec_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg i2c_msgs[],
msg.indata = response;
msg.insize = response_len;
result = bus->ec->cmd_xfer(bus->ec, &msg);
result = cros_ec_cmd_xfer(bus->ec, &msg);
if (result < 0)
goto exit;

2
drivers/input/keyboard/cros_ec_keyb.c
View File

@ -182,7 +182,7 @@ static int cros_ec_keyb_get_state(struct cros_ec_keyb *ckdev, uint8_t *kb_state)
.insize = ckdev->cols,
};
return ckdev->ec->cmd_xfer(ckdev->ec, &msg);
return cros_ec_cmd_xfer(ckdev->ec, &msg);
}
static irqreturn_t cros_ec_keyb_irq(int irq, void *data)

7
drivers/mfd/cros_ec.c
View File

@ -62,6 +62,13 @@ int cros_ec_check_result(struct cros_ec_device *ec_dev,
}
EXPORT_SYMBOL(cros_ec_check_result);
int cros_ec_cmd_xfer(struct cros_ec_device *ec_dev,
struct cros_ec_command *msg)
{
return ec_dev->cmd_xfer(ec_dev, msg);
}
EXPORT_SYMBOL(cros_ec_cmd_xfer);
static const struct mfd_cell cros_devs[] = {
{
.name = "cros-ec-keyb",

24
include/linux/mfd/cros_ec.h
View File

@ -62,10 +62,6 @@ struct cros_ec_command {
* @dev: Device pointer
* @was_wake_device: true if this device was set to wake the system from
* sleep at the last suspend
* @cmd_xfer: send command to EC and get response
* Returns the number of bytes received if the communication succeeded, but
* that doesn't mean the EC was happy with the command. The caller
* should check msg.result for the EC's result code.
*
* @priv: Private data
* @irq: Interrupt to use
@ -82,6 +78,10 @@ struct cros_ec_command {
* @dout_size: size of dout buffer to allocate (zero to use static dout)
* @parent: pointer to parent device (e.g. i2c or spi device)
* @wake_enabled: true if this device can wake the system from sleep
* @cmd_xfer: send command to EC and get response
* Returns the number of bytes received if the communication succeeded, but
* that doesn't mean the EC was happy with the command. The caller
* should check msg.result for the EC's result code.
* @lock: one transaction at a time
*/
struct cros_ec_device {
@ -92,8 +92,6 @@ struct cros_ec_device {
struct device *dev;
bool was_wake_device;
struct class *cros_class;
int (*cmd_xfer)(struct cros_ec_device *ec,
struct cros_ec_command *msg);
/* These are used to implement the platform-specific interface */
void *priv;
@ -104,6 +102,8 @@ struct cros_ec_device {
int dout_size;
struct device *parent;
bool wake_enabled;
int (*cmd_xfer)(struct cros_ec_device *ec,
struct cros_ec_command *msg);
struct mutex lock;
};
@ -152,6 +152,18 @@ int cros_ec_prepare_tx(struct cros_ec_device *ec_dev,
int cros_ec_check_result(struct cros_ec_device *ec_dev,
struct cros_ec_command *msg);
/**
* cros_ec_cmd_xfer - Send a command to the ChromeOS EC
*
* Call this to send a command to the ChromeOS EC. This should be used
* instead of calling the EC's cmd_xfer() callback directly.
*
* @ec_dev: EC device
* @msg: Message to write
*/
int cros_ec_cmd_xfer(struct cros_ec_device *ec_dev,
struct cros_ec_command *msg);
/**
* cros_ec_remove - Remove a ChromeOS EC
*