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Subject[PATCH v4 6/6] platform/chrome: mfd/cros_ec_dev: Add sysfs entry to set keyboard wake lid angle
Date
From: Gwendal Grignou <gwendal@chromium.org>

This adds a sysfs attribute (/sys/class/chromeos/cros_ec/kb_wake_angle)
used to set and get the keyboard wake lid angle. This attribute is
present only if 2 accelerometers are controlled by the EC.

This patch also moves the cros_ec features check before the device is
added so the features map obtained from the EC is ready on time.

Signed-off-by: Gwendal Grignou <gwendal@chromium.org>
Signed-off-by: Enric Balletbo i Serra <enric.balletbo@collabora.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
---

Changes in v4:
- [6/6] Allocate only one extra sensor (Gwendal)

Changes in v3:
- [6/6] Add Reviewed-by Andy Shevchenko
- [6/6] Fix the code that has_kb_wake_angle in cros_ec_sensors_register().

Changes in v2:
- [6/6] Use DEVICE_ATTR_RW variant.
- [6/6] Use one line when fits in 80 characters.
- [6/6] Use the previous defined to_cros_ec_dev

drivers/mfd/cros_ec_dev.c | 31 ++++++-------
drivers/platform/chrome/cros_ec_sysfs.c | 81 +++++++++++++++++++++++++++++++++
include/linux/mfd/cros_ec.h | 2 +
3 files changed, 96 insertions(+), 18 deletions(-)

diff --git a/drivers/mfd/cros_ec_dev.c b/drivers/mfd/cros_ec_dev.c
index e4fafdd96e5e..eafd06f62a3a 100644
--- a/drivers/mfd/cros_ec_dev.c
+++ b/drivers/mfd/cros_ec_dev.c
@@ -305,8 +305,8 @@ static void cros_ec_sensors_register(struct cros_ec_dev *ec)

resp = (struct ec_response_motion_sense *)msg->data;
sensor_num = resp->dump.sensor_count;
- /* Allocate 2 extra sensors in case lid angle or FIFO are needed */
- sensor_cells = kzalloc(sizeof(struct mfd_cell) * (sensor_num + 2),
+ /* Allocate 1 extra sensors in FIFO are needed */
+ sensor_cells = kzalloc(sizeof(struct mfd_cell) * (sensor_num + 1),
GFP_KERNEL);
if (sensor_cells == NULL)
goto error;
@@ -362,16 +362,10 @@ static void cros_ec_sensors_register(struct cros_ec_dev *ec)
sensor_type[resp->info.type]++;
id++;
}
- if (sensor_type[MOTIONSENSE_TYPE_ACCEL] >= 2) {
- sensor_platforms[id].sensor_num = sensor_num;

- sensor_cells[id].name = "cros-ec-angle";
- sensor_cells[id].id = 0;
- sensor_cells[id].platform_data = &sensor_platforms[id];
- sensor_cells[id].pdata_size =
- sizeof(struct cros_ec_sensor_platform);
- id++;
- }
+ if (sensor_type[MOTIONSENSE_TYPE_ACCEL] >= 2)
+ ec->has_kb_wake_angle = true;
+
if (cros_ec_check_features(ec, EC_FEATURE_MOTION_SENSE_FIFO)) {
sensor_cells[id].name = "cros-ec-ring";
id++;
@@ -424,6 +418,14 @@ static int ec_device_probe(struct platform_device *pdev)
goto failed;
}

+ /* check whether this EC is a sensor hub. */
+ if (cros_ec_check_features(ec, EC_FEATURE_MOTION_SENSE))
+ cros_ec_sensors_register(ec);
+
+ /* Take control of the lightbar from the EC. */
+ lb_manual_suspend_ctrl(ec, 1);
+
+ /* We can now add the sysfs class, we know which parameter to show */
retval = cdev_device_add(&ec->cdev, &ec->class_dev);
if (retval) {
dev_err(dev, "cdev_device_add failed => %d\n", retval);
@@ -433,13 +435,6 @@ static int ec_device_probe(struct platform_device *pdev)
if (cros_ec_debugfs_init(ec))
dev_warn(dev, "failed to create debugfs directory\n");

- /* check whether this EC is a sensor hub. */
- if (cros_ec_check_features(ec, EC_FEATURE_MOTION_SENSE))
- cros_ec_sensors_register(ec);
-
- /* Take control of the lightbar from the EC. */
- lb_manual_suspend_ctrl(ec, 1);
-
return 0;

failed:
diff --git a/drivers/platform/chrome/cros_ec_sysfs.c b/drivers/platform/chrome/cros_ec_sysfs.c
index 78ae0d3760e4..5a6db3fe213a 100644
--- a/drivers/platform/chrome/cros_ec_sysfs.c
+++ b/drivers/platform/chrome/cros_ec_sysfs.c
@@ -258,21 +258,102 @@ static ssize_t flashinfo_show(struct device *dev,
return ret;
}

+/* Keyboard wake angle control */
+static ssize_t kb_wake_angle_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct cros_ec_dev *ec = to_cros_ec_dev(dev);
+ struct ec_response_motion_sense *resp;
+ struct ec_params_motion_sense *param;
+ struct cros_ec_command *msg;
+ int ret;
+
+ msg = kmalloc(sizeof(*msg) + EC_HOST_PARAM_SIZE, GFP_KERNEL);
+ if (!msg)
+ return -ENOMEM;
+
+ param = (struct ec_params_motion_sense *)msg->data;
+ msg->command = EC_CMD_MOTION_SENSE_CMD + ec->cmd_offset;
+ msg->version = 2;
+ param->cmd = MOTIONSENSE_CMD_KB_WAKE_ANGLE;
+ param->kb_wake_angle.data = EC_MOTION_SENSE_NO_VALUE;
+ msg->outsize = sizeof(*param);
+ msg->insize = sizeof(*resp);
+
+ ret = cros_ec_cmd_xfer_status(ec->ec_dev, msg);
+ if (ret < 0)
+ goto exit;
+
+ resp = (struct ec_response_motion_sense *)msg->data;
+ ret = scnprintf(buf, PAGE_SIZE, "%d\n", resp->kb_wake_angle.ret);
+exit:
+ kfree(msg);
+ return ret;
+}
+
+static ssize_t kb_wake_angle_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct cros_ec_dev *ec = to_cros_ec_dev(dev);
+ struct ec_params_motion_sense *param;
+ struct cros_ec_command *msg;
+ u16 angle;
+ int ret;
+
+ ret = kstrtou16(buf, 0, &angle);
+ if (ret)
+ return ret;
+
+ msg = kmalloc(sizeof(*msg) + EC_HOST_PARAM_SIZE, GFP_KERNEL);
+ if (!msg)
+ return -ENOMEM;
+
+ param = (struct ec_params_motion_sense *)msg->data;
+ msg->command = EC_CMD_MOTION_SENSE_CMD + ec->cmd_offset;
+ msg->version = 2;
+ param->cmd = MOTIONSENSE_CMD_KB_WAKE_ANGLE;
+ param->kb_wake_angle.data = angle;
+ msg->outsize = sizeof(*param);
+ msg->insize = sizeof(struct ec_response_motion_sense);
+
+ ret = cros_ec_cmd_xfer_status(ec->ec_dev, msg);
+ kfree(msg);
+ if (ret < 0)
+ return ret;
+ return count;
+}
+
/* Module initialization */

static DEVICE_ATTR_RW(reboot);
static DEVICE_ATTR_RO(version);
static DEVICE_ATTR_RO(flashinfo);
+static DEVICE_ATTR_RW(kb_wake_angle);

static struct attribute *__ec_attrs[] = {
+ &dev_attr_kb_wake_angle.attr,
&dev_attr_reboot.attr,
&dev_attr_version.attr,
&dev_attr_flashinfo.attr,
NULL,
};

+static umode_t cros_ec_ctrl_visible(struct kobject *kobj,
+ struct attribute *a, int n)
+{
+ struct device *dev = container_of(kobj, struct device, kobj);
+ struct cros_ec_dev *ec = to_cros_ec_dev(dev);
+
+ if (a == &dev_attr_kb_wake_angle.attr && !ec->has_kb_wake_angle)
+ return 0;
+
+ return a->mode;
+}
+
struct attribute_group cros_ec_attr_group = {
.attrs = __ec_attrs,
+ .is_visible = cros_ec_ctrl_visible,
};
EXPORT_SYMBOL(cros_ec_attr_group);

diff --git a/include/linux/mfd/cros_ec.h b/include/linux/mfd/cros_ec.h
index c61535979b8f..2d4e23c9ea0a 100644
--- a/include/linux/mfd/cros_ec.h
+++ b/include/linux/mfd/cros_ec.h
@@ -183,6 +183,7 @@ struct cros_ec_debugfs;
* @ec_dev: cros_ec_device structure to talk to the physical device
* @dev: pointer to the platform device
* @debug_info: cros_ec_debugfs structure for debugging information
+ * @has_kb_wake_angle: true if at least 2 accelerometer are connected to the EC.
* @cmd_offset: offset to apply for each command.
*/
struct cros_ec_dev {
@@ -191,6 +192,7 @@ struct cros_ec_dev {
struct cros_ec_device *ec_dev;
struct device *dev;
struct cros_ec_debugfs *debug_info;
+ bool has_kb_wake_angle;
u16 cmd_offset;
u32 features[2];
};
--
2.16.2
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