From 7ff22787ba49c2e66dcec92f3e2b79ef6b6a0d71 Mon Sep 17 00:00:00 2001 From: Prashant Malani Date: Mon, 4 Oct 2021 10:07:09 -0700 Subject: [PATCH] platform/chrome: cros_ec_proto: Use EC struct for features The Chrome EC's features are returned through an ec_response_get_features struct, but they are stored in an independent array. Although the two are effectively the same at present (2 unsigned 32 bit ints), there is the possibility that they could go out of sync. Avoid this by only using the EC struct to store the features. Signed-off-by: Prashant Malani Link: https://lore.kernel.org/r/20211004170716.86601-1-pmalani@chromium.org Signed-off-by: Benson Leung --- drivers/mfd/cros_ec_dev.c | 4 ++-- drivers/platform/chrome/cros_ec_proto.c | 15 ++++++++------- include/linux/platform_data/cros_ec_proto.h | 2 +- 3 files changed, 11 insertions(+), 10 deletions(-) diff --git a/drivers/mfd/cros_ec_dev.c b/drivers/mfd/cros_ec_dev.c index 8c08d1c..6ee1f41 100644 --- a/drivers/mfd/cros_ec_dev.c +++ b/drivers/mfd/cros_ec_dev.c @@ -146,8 +146,8 @@ 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 */ + ec->features.flags[0] = -1U; /* Not cached yet */ + ec->features.flags[1] = -1U; /* Not cached yet */ device_initialize(&ec->class_dev); for (i = 0; i < ARRAY_SIZE(cros_mcu_devices); i++) { diff --git a/drivers/platform/chrome/cros_ec_proto.c b/drivers/platform/chrome/cros_ec_proto.c index a9f1867..b908cdd 100644 --- a/drivers/platform/chrome/cros_ec_proto.c +++ b/drivers/platform/chrome/cros_ec_proto.c @@ -812,36 +812,37 @@ EXPORT_SYMBOL(cros_ec_get_host_event); */ bool cros_ec_check_features(struct cros_ec_dev *ec, int feature) { + struct ec_response_get_features *features = &ec->features; struct cros_ec_command *msg; int ret; - if (ec->features[0] == -1U && ec->features[1] == -1U) { + if (features->flags[0] == -1U && features->flags[1] == -1U) { /* features bitmap not read yet */ - msg = kzalloc(sizeof(*msg) + sizeof(ec->features), GFP_KERNEL); + msg = kzalloc(sizeof(*msg) + sizeof(*features), GFP_KERNEL); if (!msg) { dev_err(ec->dev, "failed to allocate memory to get EC features\n"); return false; } msg->command = EC_CMD_GET_FEATURES + ec->cmd_offset; - msg->insize = sizeof(ec->features); + msg->insize = sizeof(*features); ret = cros_ec_cmd_xfer_status(ec->ec_dev, msg); if (ret < 0) { dev_warn(ec->dev, "cannot get EC features: %d/%d\n", ret, msg->result); - memset(ec->features, 0, sizeof(ec->features)); + memset(features, 0, sizeof(*features)); } else { - memcpy(ec->features, msg->data, sizeof(ec->features)); + memcpy(features, msg->data, sizeof(*features)); } dev_dbg(ec->dev, "EC features %08x %08x\n", - ec->features[0], ec->features[1]); + features->flags[0], features->flags[1]); kfree(msg); } - return !!(ec->features[feature / 32] & EC_FEATURE_MASK_0(feature)); + return !!(features->flags[feature / 32] & EC_FEATURE_MASK_0(feature)); } EXPORT_SYMBOL_GPL(cros_ec_check_features); diff --git a/include/linux/platform_data/cros_ec_proto.h b/include/linux/platform_data/cros_ec_proto.h index 9d370816a..df3c78c 100644 --- a/include/linux/platform_data/cros_ec_proto.h +++ b/include/linux/platform_data/cros_ec_proto.h @@ -205,7 +205,7 @@ struct cros_ec_dev { struct cros_ec_debugfs *debug_info; bool has_kb_wake_angle; u16 cmd_offset; - u32 features[2]; + struct ec_response_get_features features; }; #define to_cros_ec_dev(dev) container_of(dev, struct cros_ec_dev, class_dev) -- 2.7.4