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Subject[PATCH v2 8/9] platform/chrome: Add peakshift and adv_batt_charging
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Create "peakshift" and "advanced_battery_charging" directories
within the "properties" directory, and create the relevant
attributes within these. These properties have to do with
configuring some of the advanced power management options that
prolong battery health and reduce energy use at peak hours
of the day.

Scheduling events uses a 24 hour clock, and only supports time
intervals of 15 minutes. For example, to set
advanced_battery_charging to start at 4:15pm and to last for
6 hours and 45 minutes, you would use the argument "16 15 6 45".

> cd /sys/bus/platform/devices/GOOG000C\:00
> cat properties/peakshift/peakshift_battery_threshold
> 015
[means 15 percent]
> cat properties/peakshift/peakshift_monday
16 00 20 30 00 00
[starts at 4:00 pm, ends at 8:30, charging resumes at midnight]
> echo "16 00 20 31 00 00" > properties/peakshift/peakshift_monday
-bash: echo: write error: Invalid argument
> dmesg | tail -n1
[40.34534] wilco_ec GOOG00C:00: minutes must be at the quarter hour
> echo "16 0 20 45 0 0" > properties/peakshift/peakshift_monday
> cat properties/peakshift/peakshift_monday
16 00 20 45 00 00

Signed-off-by: Nick Crews <ncrews@google.com>
---

Changes in v2:
- rm license boiler plate
- rm "wilco_ec_adv_power - " prefix from docstring
- Add documentation
- Made format strings in store() and read() functions static

.../ABI/testing/sysfs-platform-wilcoec | 75 +++
drivers/platform/chrome/wilco_ec/Makefile | 2 +-
drivers/platform/chrome/wilco_ec/adv_power.c | 544 ++++++++++++++++++
drivers/platform/chrome/wilco_ec/adv_power.h | 183 ++++++
drivers/platform/chrome/wilco_ec/sysfs.c | 100 ++++
5 files changed, 903 insertions(+), 1 deletion(-)
create mode 100644 drivers/platform/chrome/wilco_ec/adv_power.c
create mode 100644 drivers/platform/chrome/wilco_ec/adv_power.h

diff --git a/Documentation/ABI/testing/sysfs-platform-wilcoec b/Documentation/ABI/testing/sysfs-platform-wilcoec
index b09e2473f948..2489b9e3fc99 100644
--- a/Documentation/ABI/testing/sysfs-platform-wilcoec
+++ b/Documentation/ABI/testing/sysfs-platform-wilcoec
@@ -93,3 +93,78 @@ Date: January 2019
KernelVersion: 4.19
Description:
Enable early Keyboard BackLight at boot.
+
+What: /sys/bus/platform/devices/GOOG000C\:00/properties/peakshift/<day of week>
+Date: January 2019
+KernelVersion: 4.19
+Description:
+ For each weekday a start and end time to run in Peak Shift mode
+ can be set. During these times the system will run from the
+ battery even if the AC is attached as long as the battery stays
+ above the threshold specified. After the end time specified the
+ system will run from AC if attached but will not charge the
+ battery. The system will again function normally using AC and
+ recharging the battery after the specified Charge Start time.
+
+ The input buffer must have the format "start_hr start_min end_hr
+ end_min charge_start_hr charge_start_min" The hour fields must
+ be in the range [0-23], and the minutes must be one of (0, 15,
+ 30, 45). The string must be parseable by sscanf() using the
+ format string "%d %d %d %d %d %d". An example valid input is
+ "6 15 009 45 23 0", which corresponds to 6:15, 9:45, and 23:00
+
+ The output buffer will be filled with the format "start_hr
+ start_min end_hr end_min charge_start_hr charge_start_min" The
+ hour fields will be in the range [0-23], and the minutes will be
+ one of (0, 15, 30, 45). Each number will be zero padded to two
+ characters. An example output is "06 15 09 45 23 00", which
+ corresponds to 6:15, 9:45, and 23:00
+
+What: /sys/bus/platform/devices/GOOG000C\:00/properties/peakshift/enable
+Date: January 2019
+KernelVersion: 4.19
+Description:
+ Enable/disable the peakshift power management policy
+
+What: /sys/bus/platform/devices/GOOG000C\:00/properties/peakshift/battery_threshold
+Date: January 2019
+KernelVersion: 4.19
+Description:
+ Read/write the battery percentage threshold for which the
+ peakshift policy is used. The valid range is [15, 50].
+
+What: /sys/bus/platform/devices/GOOG000C\:00/properties/advanced_battery_charging/<day of week>
+Date: January 2019
+KernelVersion: 4.19
+Description:
+ Advanced Charging Mode allows the user to maximize the battery
+ health. In Advanced Charging Mode the system will use standard
+ charging algorithm and other techniques during non-work hours to
+ maximize battery health. During work hours, an express charge is
+ used. This express charge allows the battery to be charged
+ faster; therefore, the battery is at full charge sooner. For
+ each day the time in which the system will be most heavily used
+ is specified by the start time and the duration. Please read the
+ Common UEFI BIOS Behavioral Specification and BatMan 2 BIOS_EC
+ Specification for more details about this feature.
+
+ The input buffer must have the format "start_hr start_min
+ duration_hr duration_min" The hour fields must be in the range
+ [0-23], and the minutes must be one of (0, 15, 30, 45). The
+ string must be parseable by sscanf() using the format string
+ "%d %d %d %d %d %d". An example valid input is "0006 15 23 45",
+ which corresponds to a start time of 6:15 and a duration of
+ 23:45.
+
+ The output buffer will be filled with the format "start_hr
+ start_min duration_hr duration_min" The hour fields will be in
+ the range [0-23], and the minutes will be one of (0, 15, 30,
+ 45). Each number will be zero padded to two characters. An
+ example output is "06 15 23 45", which corresponds to a start
+ time of 6:15 and a duration of 23:45
+
+What: /sys/bus/platform/devices/GOOG000C\:00/properties/advanced_battery_charging/enable
+Date: January 2019
+KernelVersion: 4.19
+Description:
+ Enable/disable the Advanced Battery Charging policy
diff --git a/drivers/platform/chrome/wilco_ec/Makefile b/drivers/platform/chrome/wilco_ec/Makefile
index 9c9e67171652..5220a3ff63bd 100644
--- a/drivers/platform/chrome/wilco_ec/Makefile
+++ b/drivers/platform/chrome/wilco_ec/Makefile
@@ -1,5 +1,5 @@
# SPDX-License-Identifier: GPL-2.0

wilco_ec-objs := core.o mailbox.o sysfs.o legacy.o \
- event.o properties.o
+ event.o properties.o adv_power.o
obj-$(CONFIG_WILCO_EC) += wilco_ec.o
diff --git a/drivers/platform/chrome/wilco_ec/adv_power.c b/drivers/platform/chrome/wilco_ec/adv_power.c
new file mode 100644
index 000000000000..a26920235294
--- /dev/null
+++ b/drivers/platform/chrome/wilco_ec/adv_power.c
@@ -0,0 +1,544 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * peakshift and adv_batt_charging config of Wilco EC
+ *
+ * Copyright 2018 Google LLC
+ *
+ * Peakshift:
+ * For each weekday a start and end time to run in Peak Shift mode can be set.
+ * During these times the system will run from the battery even if the AC is
+ * attached as long as the battery stays above the threshold specified.
+ * After the end time specified the system will run from AC if attached but
+ * will not charge the battery. The system will again function normally using AC
+ * and recharging the battery after the specified Charge Start time.
+ *
+ * Advanced Charging Mode:
+ * Advanced Charging Mode allows the user to maximize the battery health.
+ * In Advanced Charging Mode the system will use standard charging algorithm and
+ * other techniques during non-work hours to maximize battery health.
+ * During work hours, an express charge is used. This express charge allows the
+ * battery to be charged faster; therefore, the battery is at
+ * full charge sooner. For each day the time in which the system will be most
+ * heavily used is specified by the start time and the duration.
+ * Please read the Common UEFI BIOS Behavioral Specification and
+ * BatMan 2 BIOS_EC Specification for more details about this feature.
+ */
+
+#include <linux/kobject.h>
+#include <linux/device.h>
+#include <linux/platform_data/wilco-ec.h>
+
+#include "adv_power.h"
+#include "properties.h"
+#include "util.h"
+
+struct adv_batt_charging_data {
+ int duration_hours;
+ int duration_minutes;
+ int start_hours;
+ int start_minutes;
+};
+
+struct peakshift_data {
+ int start_hours;
+ int start_minutes;
+ int end_hours;
+ int end_minutes;
+ int charge_start_hours;
+ int charge_start_minutes;
+};
+
+/**
+ * struct time_bcd_format - spec for binary coded decimal time format
+ * @hour_position: how many bits left within the byte is the hour
+ * @minute_position: how many bits left within the byte is the minute
+ *
+ * Date and hour information is passed to/from the EC using packed bytes,
+ * where each byte represents an hour and a minute that some event occurs.
+ * The minute field always happens at quarter-hour intervals, so either
+ * 0, 15, 20, or 45. This allows this info to be packed within 2 bits.
+ * Along with the 5 bits of hour info [0-23], this gives us 7 used bits
+ * within each packed byte. The annoying thing is that the PEAKSHIFT and
+ * ADVANCED_BATTERY_CHARGING properties pack these 7 bits differently,
+ * hence this struct.
+ */
+struct time_bcd_format {
+ u8 hour_position;
+ u8 minute_position;
+};
+
+const struct time_bcd_format PEAKSHIFT_BCD_FORMAT = {
+ // bit[0] is unused
+ .hour_position = 1, // bits[1:7]
+ .minute_position = 6 // bits[6:8]
+};
+
+const struct time_bcd_format ADV_BATT_CHARGING_BCD_FORMAT = {
+ .minute_position = 0, // bits[0:2]
+ .hour_position = 2 // bits[2:7]
+ // bit[7] is unused
+};
+
+/**
+ * struct peakshift_payload - The formatted peakshift time sent/received by EC.
+ * @start_time: packed byte of hour and minute info
+ * @end_time: packed byte of hour and minute info
+ * @charge_start_time: packed byte of hour and minute info
+ * @RESERVED: an unused padding byte
+ */
+struct peakshift_payload {
+ u8 start_time;
+ u8 end_time;
+ u8 charge_start_time;
+ u8 RESERVED;
+} __packed;
+
+struct adv_batt_charging_payload {
+ u16 RESERVED;
+ u8 duration_time;
+ u8 start_time;
+} __packed;
+
+/**
+ * extract_quarter_hour() - Convert from literal minutes to quarter hour.
+ * @minutes: Literal minutes value. Needs to be one of {0, 15, 30, 45}
+ *
+ * Return one of {0, 1, 2, 3} for each of {0, 15, 30, 45}, or -EINVAL on error.
+ */
+static int extract_quarter_hour(int minutes)
+{
+ if ((minutes < 0) || (minutes > 45) || minutes % 15)
+ return -EINVAL;
+ return minutes / 15;
+}
+
+static int check_adv_batt_charging_data(struct device *dev,
+ struct adv_batt_charging_data *data)
+{
+ if (data->start_hours < 0 || data->start_hours > 23) {
+ dev_err(dev, "start_hours must be in [0-23], got %d",
+ data->start_hours);
+ return -EINVAL;
+ }
+ if (data->duration_hours < 0 || data->duration_hours > 23) {
+ dev_err(dev, "duration_hours must be in [0-23], got %d",
+ data->duration_hours);
+ return -EINVAL;
+ }
+ if (data->start_minutes < 0 || data->start_minutes > 59) {
+ dev_err(dev, "start_minutes must be in [0-59], got %d",
+ data->start_minutes);
+ return -EINVAL;
+ }
+ if (data->duration_minutes < 0 || data->duration_minutes > 59) {
+ dev_err(dev, "duration_minutes must be in [0-59], got %d",
+ data->duration_minutes);
+ return -EINVAL;
+ }
+ return 0;
+}
+
+static int check_peakshift_data(struct device *dev, struct peakshift_data *data)
+{
+ if (data->start_hours < 0 || data->start_hours > 23) {
+ dev_err(dev, "start_hours must be in [0-23], got %d",
+ data->start_hours);
+ return -EINVAL;
+ }
+ if (data->end_hours < 0 || data->end_hours > 23) {
+ dev_err(dev, "end_hours must be in [0-23], got %d",
+ data->end_hours);
+ return -EINVAL;
+ }
+ if (data->charge_start_hours < 0 || data->charge_start_hours > 23) {
+ dev_err(dev, "charge_start_hours must be in [0-23], got %d",
+ data->charge_start_hours);
+ return -EINVAL;
+ }
+ if (data->start_minutes < 0 || data->start_minutes > 59) {
+ dev_err(dev, "start_minutes must be in [0-59], got %d",
+ data->start_minutes);
+ return -EINVAL;
+ }
+ if (data->end_minutes < 0 || data->end_minutes > 59) {
+ dev_err(dev, "end_minutes must be in [0-59], got %d",
+ data->end_minutes);
+ return -EINVAL;
+ }
+ if (data->charge_start_minutes < 0 || data->charge_start_minutes > 59) {
+ dev_err(dev, "charge_start_minutes must be in [0-59], got %d",
+ data->charge_start_minutes);
+ return -EINVAL;
+ }
+ return 0;
+}
+
+/**
+ * pack_field() - Pack hour and minute info into a byte.
+ *
+ * @fmt: The format for how to place the info within the byte
+ * @hours: In range [0-23]
+ * @quarter_hour: In range [0-3], representing :00, :15, :30, and :45
+ *
+ * Return the packed byte.
+ */
+static u8 pack_field(struct time_bcd_format fmt, int hours, int quarter_hour)
+{
+ int result = 0;
+
+ result |= hours << fmt.hour_position;
+ result |= quarter_hour << fmt.minute_position;
+ return (u8) result;
+}
+
+/**
+ * unpack_field() - Extract hour and minute info from a byte.
+ *
+ * @fmt: The format for how to place the info within the byte
+ * @field: Byte which contains the packed info
+ * @hours: The value to be filled, in [0, 24]
+ * @quarter_hour: to be filled in range [0-3], meaning :00, :15, :30, and :45
+ */
+static void unpack_field(struct time_bcd_format fmt, u8 field, int *hours,
+ int *quarter_hour)
+{
+ *hours = (field >> fmt.hour_position) & 0x1f; // 00011111
+ *quarter_hour = (field >> fmt.minute_position) & 0x03; // 00000011
+}
+
+static void pack_adv_batt_charging(struct adv_batt_charging_data *data,
+ struct adv_batt_charging_payload *payload)
+{
+ payload->start_time = pack_field(ADV_BATT_CHARGING_BCD_FORMAT,
+ data->start_hours,
+ data->start_minutes);
+ payload->duration_time = pack_field(ADV_BATT_CHARGING_BCD_FORMAT,
+ data->duration_hours,
+ data->duration_minutes);
+}
+
+static void unpack_adv_batt_charging(struct adv_batt_charging_data *data,
+ struct adv_batt_charging_payload *payload)
+{
+ unpack_field(ADV_BATT_CHARGING_BCD_FORMAT, payload->start_time,
+ &(data->start_hours),
+ &(data->start_minutes));
+ unpack_field(ADV_BATT_CHARGING_BCD_FORMAT, payload->duration_time,
+ &(data->duration_hours),
+ &(data->duration_minutes));
+}
+
+static void pack_peakshift(struct peakshift_data *data,
+ struct peakshift_payload *payload)
+{
+ payload->start_time = pack_field(PEAKSHIFT_BCD_FORMAT,
+ data->start_hours,
+ data->start_minutes);
+ payload->end_time = pack_field(PEAKSHIFT_BCD_FORMAT,
+ data->end_hours,
+ data->end_minutes);
+ payload->charge_start_time = pack_field(PEAKSHIFT_BCD_FORMAT,
+ data->charge_start_hours,
+ data->charge_start_minutes);
+}
+
+static void unpack_peakshift(struct peakshift_data *data,
+ struct peakshift_payload *payload)
+{
+ unpack_field(PEAKSHIFT_BCD_FORMAT, payload->start_time,
+ &(data->start_hours),
+ &(data->start_minutes));
+ unpack_field(PEAKSHIFT_BCD_FORMAT, payload->end_time,
+ &(data->end_hours),
+ &(data->end_minutes));
+ unpack_field(PEAKSHIFT_BCD_FORMAT, payload->charge_start_time,
+ &(data->charge_start_hours),
+ &(data->charge_start_minutes));
+}
+
+ssize_t wilco_ec_peakshift_show(struct kobject *kobj,
+ struct kobj_attribute *attr, char *buf)
+{
+ struct property_attribute *prop_attr;
+ struct device *dev;
+ struct wilco_ec_device *ec;
+ struct peakshift_payload payload;
+ struct peakshift_data data;
+ static const char FORMAT[] = "%02d %02d %02d %02d %02d %02d\n";
+ const int OUT_LENGTH = 18; //six 2-char nums, 5 spaces, 1 newline
+ int ret;
+
+ if (OUT_LENGTH + 1 > PAGE_SIZE)
+ return -ENOBUFS; //no buffer space for message + null
+
+ prop_attr = container_of(attr, struct property_attribute, kobj_attr);
+ dev = device_from_kobject(kobj);
+ ec = dev_get_drvdata(dev);
+
+ /* get the raw payload of data from the EC */
+ ret = wilco_ec_get_property(ec, prop_attr->pid, sizeof(payload),
+ (u8 *) &payload);
+ if (ret < 0) {
+ dev_err(dev, "error in wilco_ec_mailbox()");
+ return ret;
+ }
+
+ /* unpack raw bytes, and convert quarter-hour to literal minute */
+ unpack_peakshift(&data, &payload);
+ data.start_minutes *= 15;
+ data.end_minutes *= 15;
+ data.charge_start_minutes *= 15;
+
+ /* Check that the EC returns good data */
+ ret = check_peakshift_data(dev, &data);
+ if (ret < 0) {
+ dev_err(dev, "EC returned out of range minutes or hours");
+ return -EBADMSG;
+ }
+
+ /* Print the numbers to the string */
+ ret = scnprintf(buf, OUT_LENGTH+1, FORMAT,
+ data.start_hours,
+ data.start_minutes,
+ data.end_hours,
+ data.end_minutes,
+ data.charge_start_hours,
+ data.charge_start_minutes);
+ if (ret != OUT_LENGTH) {
+ dev_err(dev, "expected to write %d chars, wrote %d", OUT_LENGTH,
+ ret);
+ return -EIO;
+ }
+
+ return OUT_LENGTH;
+}
+
+ssize_t wilco_ec_peakshift_store(struct kobject *kobj,
+ struct kobj_attribute *attr, const char *buf,
+ size_t count)
+{
+ struct property_attribute *prop_attr;
+ struct device *dev;
+ struct wilco_ec_device *ec;
+ struct peakshift_data data;
+ struct peakshift_payload payload;
+ static const char FORMAT[] = "%d %d %d %d %d %d";
+ int ret;
+
+ prop_attr = container_of(attr, struct property_attribute, kobj_attr);
+ dev = device_from_kobject(kobj);
+ ec = dev_get_drvdata(dev);
+
+ /* Extract our 6 numbers from the input string */
+ ret = sscanf(buf, FORMAT,
+ &data.start_hours,
+ &data.start_minutes,
+ &data.end_hours,
+ &data.end_minutes,
+ &data.charge_start_hours,
+ &data.charge_start_minutes);
+ if (ret != 6) {
+ dev_err(dev, "unable to parse '%s' into 6 integers", buf);
+ return -EINVAL;
+ }
+
+ /* Ensure the integers we parsed are valid */
+ ret = check_peakshift_data(dev, &data);
+ if (ret < 0)
+ return ret;
+
+ /* Convert the literal minutes to which quarter hour they represent */
+ data.start_minutes = extract_quarter_hour(data.start_minutes);
+ if (data.start_minutes < 0)
+ goto bad_minutes;
+ data.end_minutes = extract_quarter_hour(data.end_minutes);
+ if (data.end_minutes < 0)
+ goto bad_minutes;
+ data.charge_start_minutes = extract_quarter_hour(
+ data.charge_start_minutes);
+ if (data.charge_start_minutes < 0)
+ goto bad_minutes;
+
+ /* Create the raw byte payload and send it off */
+ pack_peakshift(&data, &payload);
+ wilco_ec_set_property(ec, OP_SET, prop_attr->pid, sizeof(payload),
+ (u8 *) &payload);
+
+ return count;
+
+bad_minutes:
+ dev_err(dev, "minutes must be at the quarter hour");
+ return -EINVAL;
+}
+
+ssize_t wilco_ec_peakshift_batt_thresh_show(struct kobject *kobj,
+ struct kobj_attribute *attr,
+ char *buf)
+{
+ struct device *dev;
+ struct wilco_ec_device *ec;
+ static const char FORMAT[] = "%02d\n";
+ size_t RESULT_LENGTH = 3; /* 2-char number and newline */
+ u8 percent;
+ int ret;
+
+ dev = device_from_kobject(kobj);
+ ec = dev_get_drvdata(dev);
+
+ ret = wilco_ec_get_property(ec, PID_PEAKSHIFT_BATTERY_THRESHOLD, 1,
+ &percent);
+ if (ret < 0)
+ return ret;
+
+ if (percent < 15 || percent > 50) {
+ dev_err(ec->dev, "expected 15 < percentage < 50, got %d",
+ percent);
+ return -EBADMSG;
+ }
+
+ scnprintf(buf, RESULT_LENGTH+1, FORMAT, percent);
+
+ return RESULT_LENGTH;
+}
+
+ssize_t wilco_ec_peakshift_batt_thresh_store(struct kobject *kobj,
+ struct kobj_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct device *dev;
+ struct wilco_ec_device *ec;
+ u8 DECIMAL_BASE = 10;
+ u8 percent;
+ int ret;
+
+ dev = device_from_kobject(kobj);
+ ec = dev_get_drvdata(dev);
+
+
+ ret = kstrtou8(buf, DECIMAL_BASE, &percent);
+ if (ret) {
+ dev_err(dev, "unable to parse '%s' to u8", buf);
+ return ret;
+ }
+
+ if (percent < 15 || percent > 50) {
+ dev_err(dev, "require 15 < batt_thresh_percent < 50, got %d",
+ percent);
+ return -EINVAL;
+ }
+
+ ret = wilco_ec_set_property(ec, OP_SET, PID_PEAKSHIFT_BATTERY_THRESHOLD,
+ 1, &percent);
+ if (ret < 0)
+ return ret;
+
+ return count;
+}
+
+ssize_t wilco_ec_abc_show(struct kobject *kobj, struct kobj_attribute *attr,
+ char *buf)
+{
+ struct property_attribute *prop_attr;
+ struct device *dev;
+ struct wilco_ec_device *ec;
+ struct adv_batt_charging_payload payload;
+ struct adv_batt_charging_data data;
+ static const char FORMAT[] = "%02d %02d %02d %02d\n";
+ const int OUT_LENGTH = 12; //four 2-char nums, 3 spaces, 1 newline
+ int ret;
+
+ prop_attr = container_of(attr, struct property_attribute, kobj_attr);
+ dev = device_from_kobject(kobj);
+ ec = dev_get_drvdata(dev);
+
+
+ if (OUT_LENGTH + 1 > PAGE_SIZE)
+ return -ENOBUFS; //no buffer space for message + null
+
+ /* get the raw payload of data from the EC */
+ ret = wilco_ec_get_property(ec, prop_attr->pid, sizeof(payload),
+ (u8 *) &payload);
+ if (ret < 0) {
+ dev_err(dev, "error in wilco_ec_mailbox()");
+ return ret;
+ }
+
+ /* unpack raw bytes, and convert quarter-hour to literal minute */
+ unpack_adv_batt_charging(&data, &payload);
+ data.start_minutes *= 15;
+ data.duration_minutes *= 15;
+
+ // /* Is this needed? can we assume the EC returns good data? */
+ // EC is returning 00 00 27 30. Was this modified, or is EC weird
+ // out of the box?
+ ret = check_adv_batt_charging_data(dev, &data);
+ if (ret < 0) {
+ dev_err(dev, "EC returned out of range minutes or hours");
+ return -EBADMSG;
+ }
+
+ /* Print the numbers to the string */
+ ret = scnprintf(buf, OUT_LENGTH+1, FORMAT,
+ data.start_hours,
+ data.start_minutes,
+ data.duration_hours,
+ data.duration_minutes);
+ if (ret != OUT_LENGTH) {
+ dev_err(dev, "expected to write %d chars, wrote %d", OUT_LENGTH,
+ ret);
+ return -EIO;
+ }
+
+ return OUT_LENGTH;
+}
+
+ssize_t wilco_ec_abc_store(struct kobject *kobj, struct kobj_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct property_attribute *prop_attr;
+ struct device *dev;
+ struct wilco_ec_device *ec;
+ struct adv_batt_charging_data data;
+ struct adv_batt_charging_payload payload;
+ static const char FORMAT[] = "%d %d %d %d";
+ int ret;
+
+ prop_attr = container_of(attr, struct property_attribute, kobj_attr);
+ dev = device_from_kobject(kobj);
+ ec = dev_get_drvdata(dev);
+
+ /* Extract our 4 numbers from the input string */
+ ret = sscanf(buf, FORMAT,
+ &data.start_hours,
+ &data.start_minutes,
+ &data.duration_hours,
+ &data.duration_minutes);
+ if (ret != 4) {
+ dev_err(dev, "unable to parse '%s' into 4 integers", buf);
+ return -EINVAL;
+ }
+
+ /* Ensure the integers we parsed are valid */
+ ret = check_adv_batt_charging_data(dev, &data);
+ if (ret < 0)
+ return ret;
+
+ /* Convert the literal minutes to which quarter hour they represent */
+ data.start_minutes = extract_quarter_hour(data.start_minutes);
+ if (data.start_minutes < 0)
+ goto bad_minutes;
+ data.duration_minutes = extract_quarter_hour(data.duration_minutes);
+ if (data.duration_minutes < 0)
+ goto bad_minutes;
+
+ /* Create the raw byte payload and send it off */
+ pack_adv_batt_charging(&data, &payload);
+ wilco_ec_set_property(ec, OP_SET, prop_attr->pid, sizeof(payload),
+ (u8 *) &payload);
+
+ return count;
+
+bad_minutes:
+ dev_err(dev, "minutes must be at the quarter hour");
+ return -EINVAL;
+}
diff --git a/drivers/platform/chrome/wilco_ec/adv_power.h b/drivers/platform/chrome/wilco_ec/adv_power.h
new file mode 100644
index 000000000000..6fd64c6dac8f
--- /dev/null
+++ b/drivers/platform/chrome/wilco_ec/adv_power.h
@@ -0,0 +1,183 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * peakshift and adv_batt_charging config of Wilco EC
+ *
+ * Copyright 2018 Google LLC
+ *
+ * Peakshift:
+ * For each weekday a start and end time to run in Peak Shift mode can be set.
+ * During these times the system will run from the battery even if the AC is
+ * attached as long as the battery stays above the threshold specified.
+ * After the end time specified the system will run from AC if attached but
+ * will not charge the battery. The system will again function normally using AC
+ * and recharging the battery after the specified Charge Start time.
+ *
+ * Advanced Charging Mode:
+ * Advanced Charging Mode allows the user to maximize the battery health.
+ * In Advanced Charging Mode the system will use standard charging algorithm and
+ * other techniques during non-work hours to maximize battery health.
+ * During work hours, an express charge is used. This express charge allows the
+ * battery to be charged faster; therefore, the battery is at
+ * full charge sooner. For each day the time in which the system will be most
+ * heavily used is specified by the start time and the duration.
+ * Please read the Common UEFI BIOS Behavioral Specification and
+ * BatMan 2 BIOS_EC Specification for more details about this feature.
+ */
+
+#ifndef WILCO_EC_ADV_POWER_H
+#define WILCO_EC_ADV_POWER_H
+
+#include <linux/kobject.h>
+#include <linux/platform_data/wilco-ec.h>
+#include <linux/sysfs.h>
+
+#include "util.h"
+#include "properties.h"
+
+#define PID_PEAKSHIFT 0x0412
+#define PID_PEAKSHIFT_BATTERY_THRESHOLD 0x04EB
+#define PID_PEAKSHIFT_SUNDAY_HOURS 0x04F5
+#define PID_PEAKSHIFT_MONDAY_HOURS 0x04F6
+#define PID_PEAKSHIFT_TUESDAY_HOURS 0x04F7
+#define PID_PEAKSHIFT_WEDNESDAY_HOURS 0x04F8
+#define PID_PEAKSHIFT_THURSDAY_HOURS 0x04F9
+#define PID_PEAKSHIFT_FRIDAY_HOURS 0x04Fa
+#define PID_PEAKSHIFT_SATURDAY_HOURS 0x04Fb
+
+#define PID_ABC_MODE 0x04ed
+#define PID_ABC_SUNDAY_HOURS 0x04F5
+#define PID_ABC_MONDAY_HOURS 0x04F6
+#define PID_ABC_TUESDAY_HOURS 0x04F7
+#define PID_ABC_WEDNESDAY_HOURS 0x04F8
+#define PID_ABC_THURSDAY_HOURS 0x04F9
+#define PID_ABC_FRIDAY_HOURS 0x04FA
+#define PID_ABC_SATURDAY_HOURS 0x04FB
+
+/**
+ * wilco_ec_peakshift_show() - Retrieves times stored for the peakshift policy.
+ * @kobj: kobject representing the directory this attribute is in
+ * @attr: Attribute stored within the proper property_attribute
+ * @buf: Output buffer to fill with the result
+ *
+ * The output buffer will be filled with the format
+ * "start_hr start_min end_hr end_min charge_start_hr charge_start_min"
+ * The hour fields will be in the range [0-23], and the minutes will be
+ * one of (0, 15, 30, 45). Each number will be zero padded to two characters.
+ *
+ * An example output is "06 15 09 45 23 00",
+ * which corresponds to 6:15, 9:45, and 23:00
+ *
+ * Return the length of the output buffer, or negative error code on failure.
+ */
+ssize_t wilco_ec_peakshift_show(struct kobject *kobj,
+ struct kobj_attribute *attr, char *buf);
+
+/**
+ * wilco_ec_peakshift_store() - Saves times for the peakshift policy.
+ * @kobj: kobject representing the directory this attribute is in
+ * @attr: Attribute stored within the proper property_attribute
+ * @buf: Raw input buffer
+ * @count: Number of bytes in input buffer
+ *
+ * The input buffer must have the format
+ * "start_hr start_min end_hr end_min charge_start_hr charge_start_min"
+ * The hour fields must be in the range [0-23], and the minutes must be
+ * one of (0, 15, 30, 45). The string must be parseable by sscanf() using the
+ * format string "%d %d %d %d %d %d".
+ *
+ * An example valid input is "6 15 009 45 23 0",
+ * which corresponds to 6:15, 9:45, and 23:00
+ *
+ * Return number of bytes consumed from input, negative error code on failure.
+ */
+ssize_t wilco_ec_peakshift_store(struct kobject *kobj,
+ struct kobj_attribute *attr, const char *buf,
+ size_t count);
+
+/**
+ * peakshift_battery_show() - Retrieve batt percentage at which peakshift stops
+ * @kobj: kobject representing the directory this attribute is in
+ * @attr: Attribute stored within the proper property_attribute
+ * @buf: Output buffer to fill with the result
+ *
+ * Result will be a 2 character integer representing the
+ * battery percentage at which peakshift stops. Will be in range [15, 50].
+ *
+ * Return the length of the output buffer, or negative error code on failure.
+ */
+ssize_t wilco_ec_peakshift_batt_thresh_show(struct kobject *kobj,
+ struct kobj_attribute *attr,
+ char *buf);
+
+/**
+ * peakshift_battery_store() - Save batt percentage at which peakshift stops
+ * @kobj: kobject representing the directory this attribute is in
+ * @attr: Attribute stored within the proper property_attribute
+ * @buf: Input buffer, should be parseable to range [15,50] by kstrtou8()
+ * @count: Number of bytes in input buffer
+ *
+ * Return number of bytes consumed from input, negative error code on failure.
+ */
+ssize_t wilco_ec_peakshift_batt_thresh_store(struct kobject *kobj,
+ struct kobj_attribute *attr,
+ const char *buf, size_t count);
+
+/**
+ * wilco_ec_abc_show() - Retrieve times for Advanced Battery Charging
+ * @kobj: kobject representing the directory this attribute is in
+ * @attr: Attribute stored within the proper property_attribute
+ * @buf: Output buffer to fill with the result
+ *
+ * The output buffer will be filled with the format
+ * "start_hr start_min duration_hr duration_min"
+ * The hour fields will be in the range [0-23], and the minutes will be
+ * one of (0, 15, 30, 45). Each number will be zero padded to two characters.
+ *
+ * An example output is "06 15 23 45",
+ * which corresponds to a start time of 6:15 and a duration of 23:45
+ *
+ * Return the length of the output buffer, or negative error code on failure.
+ */
+ssize_t wilco_ec_abc_show(struct kobject *kobj, struct kobj_attribute *attr,
+ char *buf);
+
+/**
+ * wilco_ec_abc_store() - Save times for Advanced Battery Charging
+ * @kobj: kobject representing the directory this attribute is in
+ * @attr: Attribute stored within the proper property_attribute
+ * @buf: The raw input buffer
+ * @count: Number of bytes in input buffer
+ *
+ * The input buffer must have the format
+ * "start_hr start_min duration_hr duration_min"
+ * The hour fields must be in the range [0-23], and the minutes must be
+ * one of (0, 15, 30, 45). The string must be parseable by sscanf() using the
+ * format string "%d %d %d %d %d %d".
+ *
+ * An example valid input is "0006 15 23 45",
+ * which corresponds to a start time of 6:15 and a duration of 23:45
+ *
+ * Return number of bytes consumed, or negative error code on failure.
+ */
+ssize_t wilco_ec_abc_store(struct kobject *kobj, struct kobj_attribute *attr,
+ const char *buf, size_t count);
+
+#define PEAKSHIFT_KOBJ_ATTR(_name) \
+__ATTR(_name, 0644, wilco_ec_peakshift_show, wilco_ec_peakshift_store)
+
+#define PEAKSHIFT_ATTRIBUTE(_var, _name, _pid) \
+struct property_attribute _var = { \
+ .kobj_attr = PEAKSHIFT_KOBJ_ATTR(_name), \
+ .pid = _pid, \
+}
+
+#define ABC_KOBJ_ATTR(_name) \
+__ATTR(_name, 0644, wilco_ec_abc_show, wilco_ec_abc_store)
+
+#define ABC_ATTRIBUTE(_var, _name, _pid) \
+struct property_attribute _var = { \
+ .kobj_attr = ABC_KOBJ_ATTR(_name), \
+ .pid = _pid, \
+}
+
+#endif /* WILCO_EC_ADV_POWER_H */
diff --git a/drivers/platform/chrome/wilco_ec/sysfs.c b/drivers/platform/chrome/wilco_ec/sysfs.c
index b81f251f78fc..c5657bf7672a 100644
--- a/drivers/platform/chrome/wilco_ec/sysfs.c
+++ b/drivers/platform/chrome/wilco_ec/sysfs.c
@@ -16,6 +16,7 @@

#include "legacy.h"
#include "properties.h"
+#include "adv_power.h"

#define WILCO_EC_ATTR_RO(_name) \
__ATTR(_name, 0444, wilco_ec_##_name##_show, NULL)
@@ -74,6 +75,67 @@ struct attribute *wilco_ec_property_attrs[] = {
ATTRIBUTE_GROUPS(wilco_ec_property);
struct kobject *prop_dir_kobj;

+/* Make peakshift attrs, which live inside GOOG000C:00/properties/peakshift */
+struct kobj_attribute kobj_attr_peakshift_battery_threshold =
+ __ATTR(battery_threshold, 0644, wilco_ec_peakshift_batt_thresh_show,
+ wilco_ec_peakshift_batt_thresh_store);
+BOOLEAN_PROPERTY_RW_ATTRIBUTE(OP_SET, prop_attr_peakshift, enable,
+ PID_PEAKSHIFT);
+PEAKSHIFT_ATTRIBUTE(prop_attr_peakshift_sunday, sunday,
+ PID_PEAKSHIFT_SUNDAY_HOURS);
+PEAKSHIFT_ATTRIBUTE(prop_attr_peakshift_monday, monday,
+ PID_PEAKSHIFT_MONDAY_HOURS);
+PEAKSHIFT_ATTRIBUTE(prop_attr_peakshift_tuesday, tuesday,
+ PID_PEAKSHIFT_TUESDAY_HOURS);
+PEAKSHIFT_ATTRIBUTE(prop_attr_peakshift_wednesday, wednesday,
+ PID_PEAKSHIFT_WEDNESDAY_HOURS);
+PEAKSHIFT_ATTRIBUTE(prop_attr_peakshift_thursday, thursday,
+ PID_PEAKSHIFT_THURSDAY_HOURS);
+PEAKSHIFT_ATTRIBUTE(prop_attr_peakshift_friday, friday,
+ PID_PEAKSHIFT_FRIDAY_HOURS);
+PEAKSHIFT_ATTRIBUTE(prop_attr_peakshift_saturday, saturday,
+ PID_PEAKSHIFT_SATURDAY_HOURS);
+struct attribute *wilco_ec_peakshift_attrs[] = {
+ &kobj_attr_peakshift_battery_threshold.attr,
+ &prop_attr_peakshift.kobj_attr.attr,
+ &prop_attr_peakshift_sunday.kobj_attr.attr,
+ &prop_attr_peakshift_monday.kobj_attr.attr,
+ &prop_attr_peakshift_tuesday.kobj_attr.attr,
+ &prop_attr_peakshift_wednesday.kobj_attr.attr,
+ &prop_attr_peakshift_thursday.kobj_attr.attr,
+ &prop_attr_peakshift_friday.kobj_attr.attr,
+ &prop_attr_peakshift_saturday.kobj_attr.attr,
+ NULL
+};
+ATTRIBUTE_GROUPS(wilco_ec_peakshift);
+struct kobject *peakshift_dir_kobj;
+
+/**
+ * Make peakshift attrs, which live inside
+ * GOOG000C:00/properties/advanced_battery_charging
+ */
+BOOLEAN_PROPERTY_RW_ATTRIBUTE(OP_SET, prop_attr_abc, enable, PID_ABC_MODE);
+ABC_ATTRIBUTE(prop_attr_abc_sunday, sunday, PID_ABC_SUNDAY_HOURS);
+ABC_ATTRIBUTE(prop_attr_abc_monday, monday, PID_ABC_MONDAY_HOURS);
+ABC_ATTRIBUTE(prop_attr_abc_tuesday, tuesday, PID_ABC_TUESDAY_HOURS);
+ABC_ATTRIBUTE(prop_attr_abc_wednesday, wednesday, PID_ABC_WEDNESDAY_HOURS);
+ABC_ATTRIBUTE(prop_attr_abc_thursday, thursday, PID_ABC_THURSDAY_HOURS);
+ABC_ATTRIBUTE(prop_attr_abc_friday, friday, PID_ABC_FRIDAY_HOURS);
+ABC_ATTRIBUTE(prop_attr_abc_saturday, saturday, PID_ABC_SATURDAY_HOURS);
+struct attribute *wilco_ec_adv_batt_charging_attrs[] = {
+ &prop_attr_abc.kobj_attr.attr,
+ &prop_attr_abc_sunday.kobj_attr.attr,
+ &prop_attr_abc_monday.kobj_attr.attr,
+ &prop_attr_abc_tuesday.kobj_attr.attr,
+ &prop_attr_abc_wednesday.kobj_attr.attr,
+ &prop_attr_abc_thursday.kobj_attr.attr,
+ &prop_attr_abc_friday.kobj_attr.attr,
+ &prop_attr_abc_saturday.kobj_attr.attr,
+ NULL
+};
+ATTRIBUTE_GROUPS(wilco_ec_adv_batt_charging);
+struct kobject *adv_batt_charging_dir_kobj;
+
/**
* wilco_ec_sysfs_init() - Initialize the sysfs directories and attributes
* @dev: The device representing the EC
@@ -103,9 +165,42 @@ int wilco_ec_sysfs_init(struct wilco_ec_device *ec)
if (ret)
goto rm_properties_dir;

+ /* add directory for adv batt charging into the properties directory */
+ adv_batt_charging_dir_kobj = kobject_create_and_add(
+ "advanced_battery_charging",
+ prop_dir_kobj);
+ if (!adv_batt_charging_dir_kobj)
+ goto rm_properties_attrs;
+
+ /* add the adv batt charging attributes into the abc directory */
+ ret = sysfs_create_groups(adv_batt_charging_dir_kobj,
+ wilco_ec_adv_batt_charging_groups);
+ if (ret)
+ goto rm_abc_dir;
+
+ /* add the directory for peakshift into the properties directory */
+ peakshift_dir_kobj = kobject_create_and_add("peakshift", prop_dir_kobj);
+ if (!peakshift_dir_kobj)
+ goto rm_abc_attrs;
+
+ /* add the peakshift attributes into the peakshift directory */
+ ret = sysfs_create_groups(peakshift_dir_kobj,
+ wilco_ec_peakshift_groups);
+ if (ret)
+ goto rm_peakshift_dir;
+
return 0;

/* Go upwards through the directory structure, cleaning up */
+rm_peakshift_dir:
+ kobject_put(peakshift_dir_kobj);
+rm_abc_attrs:
+ sysfs_remove_groups(adv_batt_charging_dir_kobj,
+ wilco_ec_adv_batt_charging_groups);
+rm_abc_dir:
+ kobject_put(adv_batt_charging_dir_kobj);
+rm_properties_attrs:
+ sysfs_remove_groups(prop_dir_kobj, wilco_ec_property_groups);
rm_properties_dir:
kobject_put(prop_dir_kobj);
rm_toplevel_attrs:
@@ -119,6 +214,11 @@ void wilco_ec_sysfs_remove(struct wilco_ec_device *ec)
struct device *dev = ec->dev;

/* go upwards through the directory structure */
+ sysfs_remove_groups(peakshift_dir_kobj, wilco_ec_peakshift_groups);
+ kobject_put(peakshift_dir_kobj);
+ sysfs_remove_groups(adv_batt_charging_dir_kobj,
+ wilco_ec_adv_batt_charging_groups);
+ kobject_put(adv_batt_charging_dir_kobj);
sysfs_remove_groups(prop_dir_kobj, wilco_ec_property_groups);
kobject_put(prop_dir_kobj);
sysfs_remove_groups(&dev->kobj, wilco_ec_toplevel_groups);
--
2.20.1.97.g81188d93c3-goog
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