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authorVincent Palatin <vpalatin@chromium.org>2016-08-01 12:54:37 +0300
committerJonathan Cameron <jic23@kernel.org>2016-10-25 20:20:29 +0300
commite4244ebddae27e9200146bba897f12a3950ce722 (patch)
tree950f21d391cfaa5409f38d3eb4aee0901f376fca /drivers/platform/chrome
parentc14dca07a31dac8bd91aa818df62fb3bf1d846c5 (diff)
downloadlinux-e4244ebddae27e9200146bba897f12a3950ce722.tar.xz
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>
Diffstat (limited to 'drivers/platform/chrome')
-rw-r--r--drivers/platform/chrome/cros_ec_dev.c37
1 files changed, 37 insertions, 0 deletions
diff --git a/drivers/platform/chrome/cros_ec_dev.c b/drivers/platform/chrome/cros_ec_dev.c
index 8abd80dbcbed..7eb53078b03d 100644
--- a/drivers/platform/chrome/cros_ec_dev.c
+++ b/drivers/platform/chrome/cros_ec_dev.c
@@ -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);