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platform/chrome: Introduce a new function to check EC features. 

Use the EC_CMD_GET_FEATURES message to check the supported features for
each MCU.

Signed-off-by: Vincent Palatin <vpalatin@chromium.org>
[tomeu: adapted to changes in mainline]
Signed-off-by: Tomeu Vizoso <tomeu.vizoso@collabora.com>
[enric: remove references to USB PD feature and do it more generic]
Signed-off-by: Enric Balletbo i Serra <enric.balletbo@collabora.com>
Reviewed-by: Guenter Roeck <groeck@chromium.org>
For the MFD changes:
  Acked-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
This commit is contained in:
Vincent Palatin 2016-08-01 11:54:37 +02:00 committed by Jonathan Cameron
parent c14dca07a3
commit e4244ebdda
3 changed files with 122 additions and 0 deletions
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37
drivers/platform/chrome/cros_ec_dev.c
View File

@ -87,6 +87,41 @@ exit:
return ret;
}
static int cros_ec_check_features(struct cros_ec_dev *ec, int feature)
{
struct cros_ec_command *msg;
int ret;
if (ec->features[0] == -1U && ec->features[1] == -1U) {
/* features bitmap not read yet */
msg = kmalloc(sizeof(*msg) + sizeof(ec->features), GFP_KERNEL);
if (!msg)
return -ENOMEM;
msg->version = 0;
msg->command = EC_CMD_GET_FEATURES + ec->cmd_offset;
msg->insize = sizeof(ec->features);
msg->outsize = 0;
ret = cros_ec_cmd_xfer(ec->ec_dev, msg);
if (ret < 0 || msg->result != EC_RES_SUCCESS) {
dev_warn(ec->dev, "cannot get EC features: %d/%d\n",
ret, msg->result);
memset(ec->features, 0, sizeof(ec->features));
}
memcpy(ec->features, msg->data, sizeof(ec->features));
dev_dbg(ec->dev, "EC features %08x %08x\n",
ec->features[0], ec->features[1]);
kfree(msg);
}
return ec->features[feature / 32] & EC_FEATURE_MASK_0(feature);
}
/* Device file ops */
static int ec_device_open(struct inode *inode, struct file *filp)
{
@ -245,6 +280,8 @@ static int ec_device_probe(struct platform_device *pdev)
ec->ec_dev = dev_get_drvdata(dev->parent);
ec->dev = dev;
ec->cmd_offset = ec_platform->cmd_offset;
ec->features[0] = -1U; /* Not cached yet */
ec->features[1] = -1U; /* Not cached yet */
device_initialize(&ec->class_dev);
cdev_init(&ec->cdev, &fops);

1
include/linux/mfd/cros_ec.h
View File

@ -184,6 +184,7 @@ struct cros_ec_dev {
struct cros_ec_device *ec_dev;
struct device *dev;
u16 cmd_offset;
u32 features[2];
};
/**

84
include/linux/mfd/cros_ec_commands.h
View File

@ -713,6 +713,90 @@ struct ec_response_get_set_value {
/* More than one command can use these structs to get/set paramters. */
#define EC_CMD_GSV_PAUSE_IN_S5 0x0c
/*****************************************************************************/
/* List the features supported by the firmware */
#define EC_CMD_GET_FEATURES 0x0d
/* Supported features */
enum ec_feature_code {
/*
* This image contains a limited set of features. Another image
* in RW partition may support more features.
*/
EC_FEATURE_LIMITED = 0,
/*
* Commands for probing/reading/writing/erasing the flash in the
* EC are present.
*/
EC_FEATURE_FLASH = 1,
/*
* Can control the fan speed directly.
*/
EC_FEATURE_PWM_FAN = 2,
/*
* Can control the intensity of the keyboard backlight.
*/
EC_FEATURE_PWM_KEYB = 3,
/*
* Support Google lightbar, introduced on Pixel.
*/
EC_FEATURE_LIGHTBAR = 4,
/* Control of LEDs */
EC_FEATURE_LED = 5,
/* Exposes an interface to control gyro and sensors.
* The host goes through the EC to access these sensors.
* In addition, the EC may provide composite sensors, like lid angle.
*/
EC_FEATURE_MOTION_SENSE = 6,
/* The keyboard is controlled by the EC */
EC_FEATURE_KEYB = 7,
/* The AP can use part of the EC flash as persistent storage. */
EC_FEATURE_PSTORE = 8,
/* The EC monitors BIOS port 80h, and can return POST codes. */
EC_FEATURE_PORT80 = 9,
/*
* Thermal management: include TMP specific commands.
* Higher level than direct fan control.
*/
EC_FEATURE_THERMAL = 10,
/* Can switch the screen backlight on/off */
EC_FEATURE_BKLIGHT_SWITCH = 11,
/* Can switch the wifi module on/off */
EC_FEATURE_WIFI_SWITCH = 12,
/* Monitor host events, through for example SMI or SCI */
EC_FEATURE_HOST_EVENTS = 13,
/* The EC exposes GPIO commands to control/monitor connected devices. */
EC_FEATURE_GPIO = 14,
/* The EC can send i2c messages to downstream devices. */
EC_FEATURE_I2C = 15,
/* Command to control charger are included */
EC_FEATURE_CHARGER = 16,
/* Simple battery support. */
EC_FEATURE_BATTERY = 17,
/*
* Support Smart battery protocol
* (Common Smart Battery System Interface Specification)
*/
EC_FEATURE_SMART_BATTERY = 18,
/* EC can dectect when the host hangs. */
EC_FEATURE_HANG_DETECT = 19,
/* Report power information, for pit only */
EC_FEATURE_PMU = 20,
/* Another Cros EC device is present downstream of this one */
EC_FEATURE_SUB_MCU = 21,
/* Support USB Power delivery (PD) commands */
EC_FEATURE_USB_PD = 22,
/* Control USB multiplexer, for audio through USB port for instance. */
EC_FEATURE_USB_MUX = 23,
/* Motion Sensor code has an internal software FIFO */
EC_FEATURE_MOTION_SENSE_FIFO = 24,
};
#define EC_FEATURE_MASK_0(event_code) (1UL << (event_code % 32))
#define EC_FEATURE_MASK_1(event_code) (1UL << (event_code - 32))
struct ec_response_get_features {
uint32_t flags[2];
} __packed;
/*****************************************************************************/
/* Flash commands */