// SPDX-License-Identifier: GPL-2.0
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/*
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* Power Supply driver for a Greybus module.
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*
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* Copyright 2014-2015 Google Inc.
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* Copyright 2014-2015 Linaro Ltd.
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/power_supply.h>
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#include <linux/slab.h>
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#include <linux/greybus.h>
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#define PROP_MAX 32
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struct gb_power_supply_prop {
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enum power_supply_property prop;
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u8 gb_prop;
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int val;
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int previous_val;
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bool is_writeable;
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};
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struct gb_power_supply {
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u8 id;
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bool registered;
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struct power_supply *psy;
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struct power_supply_desc desc;
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char name[64];
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struct gb_power_supplies *supplies;
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struct delayed_work work;
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char *manufacturer;
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char *model_name;
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char *serial_number;
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u8 type;
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u8 properties_count;
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u8 properties_count_str;
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unsigned long last_update;
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u8 cache_invalid;
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unsigned int update_interval;
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bool changed;
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struct gb_power_supply_prop *props;
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enum power_supply_property *props_raw;
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bool pm_acquired;
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struct mutex supply_lock;
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};
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struct gb_power_supplies {
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struct gb_connection *connection;
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u8 supplies_count;
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struct gb_power_supply *supply;
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struct mutex supplies_lock;
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};
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#define to_gb_power_supply(x) power_supply_get_drvdata(x)
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/*
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* General power supply properties that could be absent from various reasons,
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* like kernel versions or vendor specific versions
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*/
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#ifndef POWER_SUPPLY_PROP_VOLTAGE_BOOT
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#define POWER_SUPPLY_PROP_VOLTAGE_BOOT -1
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#endif
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#ifndef POWER_SUPPLY_PROP_CURRENT_BOOT
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#define POWER_SUPPLY_PROP_CURRENT_BOOT -1
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#endif
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#ifndef POWER_SUPPLY_PROP_CALIBRATE
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#define POWER_SUPPLY_PROP_CALIBRATE -1
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#endif
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/* cache time in milliseconds, if cache_time is set to 0 cache is disable */
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static unsigned int cache_time = 1000;
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/*
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* update interval initial and maximum value, between the two will
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* back-off exponential
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*/
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static unsigned int update_interval_init = 1 * HZ;
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static unsigned int update_interval_max = 30 * HZ;
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struct gb_power_supply_changes {
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enum power_supply_property prop;
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u32 tolerance_change;
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void (*prop_changed)(struct gb_power_supply *gbpsy,
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struct gb_power_supply_prop *prop);
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};
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static void gb_power_supply_state_change(struct gb_power_supply *gbpsy,
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struct gb_power_supply_prop *prop);
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static const struct gb_power_supply_changes psy_props_changes[] = {
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{ .prop = GB_POWER_SUPPLY_PROP_STATUS,
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.tolerance_change = 0,
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.prop_changed = gb_power_supply_state_change,
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},
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{ .prop = GB_POWER_SUPPLY_PROP_TEMP,
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.tolerance_change = 500,
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.prop_changed = NULL,
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},
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{ .prop = GB_POWER_SUPPLY_PROP_ONLINE,
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.tolerance_change = 0,
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.prop_changed = NULL,
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},
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};
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static int get_psp_from_gb_prop(int gb_prop, enum power_supply_property *psp)
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{
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int prop;
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switch (gb_prop) {
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case GB_POWER_SUPPLY_PROP_STATUS:
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prop = POWER_SUPPLY_PROP_STATUS;
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break;
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case GB_POWER_SUPPLY_PROP_CHARGE_TYPE:
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prop = POWER_SUPPLY_PROP_CHARGE_TYPE;
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break;
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case GB_POWER_SUPPLY_PROP_HEALTH:
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prop = POWER_SUPPLY_PROP_HEALTH;
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break;
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case GB_POWER_SUPPLY_PROP_PRESENT:
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prop = POWER_SUPPLY_PROP_PRESENT;
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break;
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case GB_POWER_SUPPLY_PROP_ONLINE:
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prop = POWER_SUPPLY_PROP_ONLINE;
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break;
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case GB_POWER_SUPPLY_PROP_AUTHENTIC:
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prop = POWER_SUPPLY_PROP_AUTHENTIC;
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break;
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case GB_POWER_SUPPLY_PROP_TECHNOLOGY:
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prop = POWER_SUPPLY_PROP_TECHNOLOGY;
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break;
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case GB_POWER_SUPPLY_PROP_CYCLE_COUNT:
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prop = POWER_SUPPLY_PROP_CYCLE_COUNT;
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break;
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case GB_POWER_SUPPLY_PROP_VOLTAGE_MAX:
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prop = POWER_SUPPLY_PROP_VOLTAGE_MAX;
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break;
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case GB_POWER_SUPPLY_PROP_VOLTAGE_MIN:
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prop = POWER_SUPPLY_PROP_VOLTAGE_MIN;
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break;
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case GB_POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
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prop = POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN;
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break;
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case GB_POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
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prop = POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN;
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break;
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case GB_POWER_SUPPLY_PROP_VOLTAGE_NOW:
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prop = POWER_SUPPLY_PROP_VOLTAGE_NOW;
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break;
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case GB_POWER_SUPPLY_PROP_VOLTAGE_AVG:
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prop = POWER_SUPPLY_PROP_VOLTAGE_AVG;
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break;
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case GB_POWER_SUPPLY_PROP_VOLTAGE_OCV:
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prop = POWER_SUPPLY_PROP_VOLTAGE_OCV;
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break;
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case GB_POWER_SUPPLY_PROP_VOLTAGE_BOOT:
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prop = POWER_SUPPLY_PROP_VOLTAGE_BOOT;
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break;
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case GB_POWER_SUPPLY_PROP_CURRENT_MAX:
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prop = POWER_SUPPLY_PROP_CURRENT_MAX;
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break;
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case GB_POWER_SUPPLY_PROP_CURRENT_NOW:
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prop = POWER_SUPPLY_PROP_CURRENT_NOW;
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break;
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case GB_POWER_SUPPLY_PROP_CURRENT_AVG:
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prop = POWER_SUPPLY_PROP_CURRENT_AVG;
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break;
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case GB_POWER_SUPPLY_PROP_CURRENT_BOOT:
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prop = POWER_SUPPLY_PROP_CURRENT_BOOT;
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break;
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case GB_POWER_SUPPLY_PROP_POWER_NOW:
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prop = POWER_SUPPLY_PROP_POWER_NOW;
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break;
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case GB_POWER_SUPPLY_PROP_POWER_AVG:
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prop = POWER_SUPPLY_PROP_POWER_AVG;
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break;
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case GB_POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
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prop = POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN;
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break;
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case GB_POWER_SUPPLY_PROP_CHARGE_EMPTY_DESIGN:
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prop = POWER_SUPPLY_PROP_CHARGE_EMPTY_DESIGN;
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break;
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case GB_POWER_SUPPLY_PROP_CHARGE_FULL:
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prop = POWER_SUPPLY_PROP_CHARGE_FULL;
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break;
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case GB_POWER_SUPPLY_PROP_CHARGE_EMPTY:
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prop = POWER_SUPPLY_PROP_CHARGE_EMPTY;
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break;
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case GB_POWER_SUPPLY_PROP_CHARGE_NOW:
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prop = POWER_SUPPLY_PROP_CHARGE_NOW;
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break;
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case GB_POWER_SUPPLY_PROP_CHARGE_AVG:
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prop = POWER_SUPPLY_PROP_CHARGE_AVG;
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break;
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case GB_POWER_SUPPLY_PROP_CHARGE_COUNTER:
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prop = POWER_SUPPLY_PROP_CHARGE_COUNTER;
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break;
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case GB_POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT:
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prop = POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT;
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break;
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case GB_POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX:
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prop = POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX;
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break;
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case GB_POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE:
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prop = POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE;
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break;
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case GB_POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX:
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prop = POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX;
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break;
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case GB_POWER_SUPPLY_PROP_CHARGE_CONTROL_LIMIT:
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prop = POWER_SUPPLY_PROP_CHARGE_CONTROL_LIMIT;
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break;
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case GB_POWER_SUPPLY_PROP_CHARGE_CONTROL_LIMIT_MAX:
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prop = POWER_SUPPLY_PROP_CHARGE_CONTROL_LIMIT_MAX;
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break;
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case GB_POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
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prop = POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT;
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break;
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case GB_POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN:
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prop = POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN;
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break;
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case GB_POWER_SUPPLY_PROP_ENERGY_EMPTY_DESIGN:
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prop = POWER_SUPPLY_PROP_ENERGY_EMPTY_DESIGN;
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break;
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case GB_POWER_SUPPLY_PROP_ENERGY_FULL:
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prop = POWER_SUPPLY_PROP_ENERGY_FULL;
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break;
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case GB_POWER_SUPPLY_PROP_ENERGY_EMPTY:
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prop = POWER_SUPPLY_PROP_ENERGY_EMPTY;
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break;
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case GB_POWER_SUPPLY_PROP_ENERGY_NOW:
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prop = POWER_SUPPLY_PROP_ENERGY_NOW;
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break;
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case GB_POWER_SUPPLY_PROP_ENERGY_AVG:
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prop = POWER_SUPPLY_PROP_ENERGY_AVG;
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break;
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case GB_POWER_SUPPLY_PROP_CAPACITY:
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prop = POWER_SUPPLY_PROP_CAPACITY;
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break;
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case GB_POWER_SUPPLY_PROP_CAPACITY_ALERT_MIN:
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prop = POWER_SUPPLY_PROP_CAPACITY_ALERT_MIN;
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break;
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case GB_POWER_SUPPLY_PROP_CAPACITY_ALERT_MAX:
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prop = POWER_SUPPLY_PROP_CAPACITY_ALERT_MAX;
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break;
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case GB_POWER_SUPPLY_PROP_CAPACITY_LEVEL:
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prop = POWER_SUPPLY_PROP_CAPACITY_LEVEL;
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break;
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case GB_POWER_SUPPLY_PROP_TEMP:
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prop = POWER_SUPPLY_PROP_TEMP;
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break;
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case GB_POWER_SUPPLY_PROP_TEMP_MAX:
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prop = POWER_SUPPLY_PROP_TEMP_MAX;
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break;
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case GB_POWER_SUPPLY_PROP_TEMP_MIN:
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prop = POWER_SUPPLY_PROP_TEMP_MIN;
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break;
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case GB_POWER_SUPPLY_PROP_TEMP_ALERT_MIN:
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prop = POWER_SUPPLY_PROP_TEMP_ALERT_MIN;
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break;
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case GB_POWER_SUPPLY_PROP_TEMP_ALERT_MAX:
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prop = POWER_SUPPLY_PROP_TEMP_ALERT_MAX;
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break;
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case GB_POWER_SUPPLY_PROP_TEMP_AMBIENT:
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prop = POWER_SUPPLY_PROP_TEMP_AMBIENT;
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break;
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case GB_POWER_SUPPLY_PROP_TEMP_AMBIENT_ALERT_MIN:
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prop = POWER_SUPPLY_PROP_TEMP_AMBIENT_ALERT_MIN;
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break;
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case GB_POWER_SUPPLY_PROP_TEMP_AMBIENT_ALERT_MAX:
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prop = POWER_SUPPLY_PROP_TEMP_AMBIENT_ALERT_MAX;
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break;
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case GB_POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW:
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prop = POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW;
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break;
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case GB_POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG:
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prop = POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG;
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break;
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case GB_POWER_SUPPLY_PROP_TIME_TO_FULL_NOW:
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prop = POWER_SUPPLY_PROP_TIME_TO_FULL_NOW;
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break;
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case GB_POWER_SUPPLY_PROP_TIME_TO_FULL_AVG:
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prop = POWER_SUPPLY_PROP_TIME_TO_FULL_AVG;
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break;
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case GB_POWER_SUPPLY_PROP_TYPE:
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prop = POWER_SUPPLY_PROP_TYPE;
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break;
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case GB_POWER_SUPPLY_PROP_SCOPE:
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prop = POWER_SUPPLY_PROP_SCOPE;
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break;
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case GB_POWER_SUPPLY_PROP_CHARGE_TERM_CURRENT:
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prop = POWER_SUPPLY_PROP_CHARGE_TERM_CURRENT;
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break;
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case GB_POWER_SUPPLY_PROP_CALIBRATE:
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prop = POWER_SUPPLY_PROP_CALIBRATE;
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break;
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default:
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prop = -1;
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break;
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}
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if (prop < 0)
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return prop;
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*psp = (enum power_supply_property)prop;
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return 0;
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}
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static struct gb_connection *get_conn_from_psy(struct gb_power_supply *gbpsy)
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{
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return gbpsy->supplies->connection;
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}
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static struct gb_power_supply_prop *get_psy_prop(struct gb_power_supply *gbpsy,
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enum power_supply_property psp)
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{
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int i;
|
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for (i = 0; i < gbpsy->properties_count; i++)
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if (gbpsy->props[i].prop == psp)
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return &gbpsy->props[i];
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return NULL;
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}
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static int is_psy_prop_writeable(struct gb_power_supply *gbpsy,
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enum power_supply_property psp)
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{
|
struct gb_power_supply_prop *prop;
|
|
prop = get_psy_prop(gbpsy, psp);
|
if (!prop)
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return -ENOENT;
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return prop->is_writeable ? 1 : 0;
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}
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static int is_prop_valint(enum power_supply_property psp)
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{
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return ((psp < POWER_SUPPLY_PROP_MODEL_NAME) ? 1 : 0);
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}
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static void next_interval(struct gb_power_supply *gbpsy)
|
{
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if (gbpsy->update_interval == update_interval_max)
|
return;
|
|
/* do some exponential back-off in the update interval */
|
gbpsy->update_interval *= 2;
|
if (gbpsy->update_interval > update_interval_max)
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gbpsy->update_interval = update_interval_max;
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}
|
|
static void __gb_power_supply_changed(struct gb_power_supply *gbpsy)
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{
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power_supply_changed(gbpsy->psy);
|
}
|
|
static void gb_power_supply_state_change(struct gb_power_supply *gbpsy,
|
struct gb_power_supply_prop *prop)
|
{
|
struct gb_connection *connection = get_conn_from_psy(gbpsy);
|
int ret;
|
|
/*
|
* Check gbpsy->pm_acquired to make sure only one pair of 'get_sync'
|
* and 'put_autosuspend' runtime pm call for state property change.
|
*/
|
mutex_lock(&gbpsy->supply_lock);
|
|
if ((prop->val == GB_POWER_SUPPLY_STATUS_CHARGING) &&
|
!gbpsy->pm_acquired) {
|
ret = gb_pm_runtime_get_sync(connection->bundle);
|
if (ret)
|
dev_err(&connection->bundle->dev,
|
"Fail to set wake lock for charging state\n");
|
else
|
gbpsy->pm_acquired = true;
|
} else {
|
if (gbpsy->pm_acquired) {
|
ret = gb_pm_runtime_put_autosuspend(connection->bundle);
|
if (ret)
|
dev_err(&connection->bundle->dev,
|
"Fail to set wake unlock for none charging\n");
|
else
|
gbpsy->pm_acquired = false;
|
}
|
}
|
|
mutex_unlock(&gbpsy->supply_lock);
|
}
|
|
static void check_changed(struct gb_power_supply *gbpsy,
|
struct gb_power_supply_prop *prop)
|
{
|
const struct gb_power_supply_changes *psyc;
|
int val = prop->val;
|
int prev_val = prop->previous_val;
|
bool changed = false;
|
int i;
|
|
for (i = 0; i < ARRAY_SIZE(psy_props_changes); i++) {
|
psyc = &psy_props_changes[i];
|
if (prop->prop == psyc->prop) {
|
if (!psyc->tolerance_change)
|
changed = true;
|
else if (val < prev_val &&
|
prev_val - val > psyc->tolerance_change)
|
changed = true;
|
else if (val > prev_val &&
|
val - prev_val > psyc->tolerance_change)
|
changed = true;
|
|
if (changed && psyc->prop_changed)
|
psyc->prop_changed(gbpsy, prop);
|
|
if (changed)
|
gbpsy->changed = true;
|
break;
|
}
|
}
|
}
|
|
static int total_props(struct gb_power_supply *gbpsy)
|
{
|
/* this return the intval plus the strval properties */
|
return (gbpsy->properties_count + gbpsy->properties_count_str);
|
}
|
|
static void prop_append(struct gb_power_supply *gbpsy,
|
enum power_supply_property prop)
|
{
|
enum power_supply_property *new_props_raw;
|
|
gbpsy->properties_count_str++;
|
new_props_raw = krealloc(gbpsy->props_raw, total_props(gbpsy) *
|
sizeof(enum power_supply_property),
|
GFP_KERNEL);
|
if (!new_props_raw)
|
return;
|
gbpsy->props_raw = new_props_raw;
|
gbpsy->props_raw[total_props(gbpsy) - 1] = prop;
|
}
|
|
static int __gb_power_supply_set_name(char *init_name, char *name, size_t len)
|
{
|
unsigned int i = 0;
|
int ret = 0;
|
struct power_supply *psy;
|
|
if (!strlen(init_name))
|
init_name = "gb_power_supply";
|
strlcpy(name, init_name, len);
|
|
while ((ret < len) && (psy = power_supply_get_by_name(name))) {
|
power_supply_put(psy);
|
|
ret = snprintf(name, len, "%s_%u", init_name, ++i);
|
}
|
if (ret >= len)
|
return -ENOMEM;
|
return i;
|
}
|
|
static void _gb_power_supply_append_props(struct gb_power_supply *gbpsy)
|
{
|
if (strlen(gbpsy->manufacturer))
|
prop_append(gbpsy, POWER_SUPPLY_PROP_MANUFACTURER);
|
if (strlen(gbpsy->model_name))
|
prop_append(gbpsy, POWER_SUPPLY_PROP_MODEL_NAME);
|
if (strlen(gbpsy->serial_number))
|
prop_append(gbpsy, POWER_SUPPLY_PROP_SERIAL_NUMBER);
|
}
|
|
static int gb_power_supply_description_get(struct gb_power_supply *gbpsy)
|
{
|
struct gb_connection *connection = get_conn_from_psy(gbpsy);
|
struct gb_power_supply_get_description_request req;
|
struct gb_power_supply_get_description_response resp;
|
int ret;
|
|
req.psy_id = gbpsy->id;
|
|
ret = gb_operation_sync(connection,
|
GB_POWER_SUPPLY_TYPE_GET_DESCRIPTION,
|
&req, sizeof(req), &resp, sizeof(resp));
|
if (ret < 0)
|
return ret;
|
|
gbpsy->manufacturer = kstrndup(resp.manufacturer, PROP_MAX, GFP_KERNEL);
|
if (!gbpsy->manufacturer)
|
return -ENOMEM;
|
gbpsy->model_name = kstrndup(resp.model, PROP_MAX, GFP_KERNEL);
|
if (!gbpsy->model_name)
|
return -ENOMEM;
|
gbpsy->serial_number = kstrndup(resp.serial_number, PROP_MAX,
|
GFP_KERNEL);
|
if (!gbpsy->serial_number)
|
return -ENOMEM;
|
|
gbpsy->type = le16_to_cpu(resp.type);
|
gbpsy->properties_count = resp.properties_count;
|
|
return 0;
|
}
|
|
static int gb_power_supply_prop_descriptors_get(struct gb_power_supply *gbpsy)
|
{
|
struct gb_connection *connection = get_conn_from_psy(gbpsy);
|
struct gb_power_supply_get_property_descriptors_request *req;
|
struct gb_power_supply_get_property_descriptors_response *resp;
|
struct gb_operation *op;
|
u8 props_count = gbpsy->properties_count;
|
enum power_supply_property psp;
|
int ret;
|
int i, r = 0;
|
|
if (props_count == 0)
|
return 0;
|
|
op = gb_operation_create(connection,
|
GB_POWER_SUPPLY_TYPE_GET_PROP_DESCRIPTORS,
|
sizeof(*req),
|
struct_size(resp, props, props_count),
|
GFP_KERNEL);
|
if (!op)
|
return -ENOMEM;
|
|
req = op->request->payload;
|
req->psy_id = gbpsy->id;
|
|
ret = gb_operation_request_send_sync(op);
|
if (ret < 0)
|
goto out_put_operation;
|
|
resp = op->response->payload;
|
|
/* validate received properties */
|
for (i = 0; i < props_count; i++) {
|
ret = get_psp_from_gb_prop(resp->props[i].property, &psp);
|
if (ret < 0) {
|
dev_warn(&connection->bundle->dev,
|
"greybus property %u it is not supported by this kernel, dropped\n",
|
resp->props[i].property);
|
gbpsy->properties_count--;
|
}
|
}
|
|
gbpsy->props = kcalloc(gbpsy->properties_count, sizeof(*gbpsy->props),
|
GFP_KERNEL);
|
if (!gbpsy->props) {
|
ret = -ENOMEM;
|
goto out_put_operation;
|
}
|
|
gbpsy->props_raw = kcalloc(gbpsy->properties_count,
|
sizeof(*gbpsy->props_raw), GFP_KERNEL);
|
if (!gbpsy->props_raw) {
|
ret = -ENOMEM;
|
goto out_put_operation;
|
}
|
|
/* Store available properties, skip the ones we do not support */
|
for (i = 0; i < props_count; i++) {
|
ret = get_psp_from_gb_prop(resp->props[i].property, &psp);
|
if (ret < 0) {
|
r++;
|
continue;
|
}
|
gbpsy->props[i - r].prop = psp;
|
gbpsy->props[i - r].gb_prop = resp->props[i].property;
|
gbpsy->props_raw[i - r] = psp;
|
if (resp->props[i].is_writeable)
|
gbpsy->props[i - r].is_writeable = true;
|
}
|
|
/*
|
* now append the properties that we already got information in the
|
* get_description operation. (char * ones)
|
*/
|
_gb_power_supply_append_props(gbpsy);
|
|
ret = 0;
|
out_put_operation:
|
gb_operation_put(op);
|
|
return ret;
|
}
|
|
static int __gb_power_supply_property_update(struct gb_power_supply *gbpsy,
|
enum power_supply_property psp)
|
{
|
struct gb_connection *connection = get_conn_from_psy(gbpsy);
|
struct gb_power_supply_prop *prop;
|
struct gb_power_supply_get_property_request req;
|
struct gb_power_supply_get_property_response resp;
|
int val;
|
int ret;
|
|
prop = get_psy_prop(gbpsy, psp);
|
if (!prop)
|
return -EINVAL;
|
req.psy_id = gbpsy->id;
|
req.property = prop->gb_prop;
|
|
ret = gb_operation_sync(connection, GB_POWER_SUPPLY_TYPE_GET_PROPERTY,
|
&req, sizeof(req), &resp, sizeof(resp));
|
if (ret < 0)
|
return ret;
|
|
val = le32_to_cpu(resp.prop_val);
|
if (val == prop->val)
|
return 0;
|
|
prop->previous_val = prop->val;
|
prop->val = val;
|
|
check_changed(gbpsy, prop);
|
|
return 0;
|
}
|
|
static int __gb_power_supply_property_get(struct gb_power_supply *gbpsy,
|
enum power_supply_property psp,
|
union power_supply_propval *val)
|
{
|
struct gb_power_supply_prop *prop;
|
|
prop = get_psy_prop(gbpsy, psp);
|
if (!prop)
|
return -EINVAL;
|
|
val->intval = prop->val;
|
return 0;
|
}
|
|
static int __gb_power_supply_property_strval_get(struct gb_power_supply *gbpsy,
|
enum power_supply_property psp,
|
union power_supply_propval *val)
|
{
|
switch (psp) {
|
case POWER_SUPPLY_PROP_MODEL_NAME:
|
val->strval = gbpsy->model_name;
|
break;
|
case POWER_SUPPLY_PROP_MANUFACTURER:
|
val->strval = gbpsy->manufacturer;
|
break;
|
case POWER_SUPPLY_PROP_SERIAL_NUMBER:
|
val->strval = gbpsy->serial_number;
|
break;
|
default:
|
break;
|
}
|
|
return 0;
|
}
|
|
static int _gb_power_supply_property_get(struct gb_power_supply *gbpsy,
|
enum power_supply_property psp,
|
union power_supply_propval *val)
|
{
|
struct gb_connection *connection = get_conn_from_psy(gbpsy);
|
int ret;
|
|
/*
|
* Properties of type const char *, were already fetched on
|
* get_description operation and should be cached in gb
|
*/
|
if (is_prop_valint(psp))
|
ret = __gb_power_supply_property_get(gbpsy, psp, val);
|
else
|
ret = __gb_power_supply_property_strval_get(gbpsy, psp, val);
|
|
if (ret < 0)
|
dev_err(&connection->bundle->dev, "get property %u\n", psp);
|
|
return 0;
|
}
|
|
static int is_cache_valid(struct gb_power_supply *gbpsy)
|
{
|
/* check if cache is good enough or it has expired */
|
if (gbpsy->cache_invalid) {
|
gbpsy->cache_invalid = 0;
|
return 0;
|
}
|
|
if (gbpsy->last_update &&
|
time_is_after_jiffies(gbpsy->last_update +
|
msecs_to_jiffies(cache_time)))
|
return 1;
|
|
return 0;
|
}
|
|
static int gb_power_supply_status_get(struct gb_power_supply *gbpsy)
|
{
|
struct gb_connection *connection = get_conn_from_psy(gbpsy);
|
int ret = 0;
|
int i;
|
|
if (is_cache_valid(gbpsy))
|
return 0;
|
|
ret = gb_pm_runtime_get_sync(connection->bundle);
|
if (ret)
|
return ret;
|
|
for (i = 0; i < gbpsy->properties_count; i++) {
|
ret = __gb_power_supply_property_update(gbpsy,
|
gbpsy->props[i].prop);
|
if (ret < 0)
|
break;
|
}
|
|
if (ret == 0)
|
gbpsy->last_update = jiffies;
|
|
gb_pm_runtime_put_autosuspend(connection->bundle);
|
return ret;
|
}
|
|
static void gb_power_supply_status_update(struct gb_power_supply *gbpsy)
|
{
|
/* check if there a change that need to be reported */
|
gb_power_supply_status_get(gbpsy);
|
|
if (!gbpsy->changed)
|
return;
|
|
gbpsy->update_interval = update_interval_init;
|
__gb_power_supply_changed(gbpsy);
|
gbpsy->changed = false;
|
}
|
|
static void gb_power_supply_work(struct work_struct *work)
|
{
|
struct gb_power_supply *gbpsy = container_of(work,
|
struct gb_power_supply,
|
work.work);
|
|
/*
|
* if the poll interval is not set, disable polling, this is helpful
|
* specially at unregister time.
|
*/
|
if (!gbpsy->update_interval)
|
return;
|
|
gb_power_supply_status_update(gbpsy);
|
next_interval(gbpsy);
|
schedule_delayed_work(&gbpsy->work, gbpsy->update_interval);
|
}
|
|
static int get_property(struct power_supply *b,
|
enum power_supply_property psp,
|
union power_supply_propval *val)
|
{
|
struct gb_power_supply *gbpsy = to_gb_power_supply(b);
|
|
gb_power_supply_status_get(gbpsy);
|
|
return _gb_power_supply_property_get(gbpsy, psp, val);
|
}
|
|
static int gb_power_supply_property_set(struct gb_power_supply *gbpsy,
|
enum power_supply_property psp,
|
int val)
|
{
|
struct gb_connection *connection = get_conn_from_psy(gbpsy);
|
struct gb_power_supply_prop *prop;
|
struct gb_power_supply_set_property_request req;
|
int ret;
|
|
ret = gb_pm_runtime_get_sync(connection->bundle);
|
if (ret)
|
return ret;
|
|
prop = get_psy_prop(gbpsy, psp);
|
if (!prop) {
|
ret = -EINVAL;
|
goto out;
|
}
|
|
req.psy_id = gbpsy->id;
|
req.property = prop->gb_prop;
|
req.prop_val = cpu_to_le32((s32)val);
|
|
ret = gb_operation_sync(connection, GB_POWER_SUPPLY_TYPE_SET_PROPERTY,
|
&req, sizeof(req), NULL, 0);
|
if (ret < 0)
|
goto out;
|
|
/* cache immediately the new value */
|
prop->val = val;
|
|
out:
|
gb_pm_runtime_put_autosuspend(connection->bundle);
|
return ret;
|
}
|
|
static int set_property(struct power_supply *b,
|
enum power_supply_property psp,
|
const union power_supply_propval *val)
|
{
|
struct gb_power_supply *gbpsy = to_gb_power_supply(b);
|
|
return gb_power_supply_property_set(gbpsy, psp, val->intval);
|
}
|
|
static int property_is_writeable(struct power_supply *b,
|
enum power_supply_property psp)
|
{
|
struct gb_power_supply *gbpsy = to_gb_power_supply(b);
|
|
return is_psy_prop_writeable(gbpsy, psp);
|
}
|
|
static int gb_power_supply_register(struct gb_power_supply *gbpsy)
|
{
|
struct gb_connection *connection = get_conn_from_psy(gbpsy);
|
struct power_supply_config cfg = {};
|
|
cfg.drv_data = gbpsy;
|
|
gbpsy->desc.name = gbpsy->name;
|
gbpsy->desc.type = gbpsy->type;
|
gbpsy->desc.properties = gbpsy->props_raw;
|
gbpsy->desc.num_properties = total_props(gbpsy);
|
gbpsy->desc.get_property = get_property;
|
gbpsy->desc.set_property = set_property;
|
gbpsy->desc.property_is_writeable = property_is_writeable;
|
|
gbpsy->psy = power_supply_register(&connection->bundle->dev,
|
&gbpsy->desc, &cfg);
|
return PTR_ERR_OR_ZERO(gbpsy->psy);
|
}
|
|
static void _gb_power_supply_free(struct gb_power_supply *gbpsy)
|
{
|
kfree(gbpsy->serial_number);
|
kfree(gbpsy->model_name);
|
kfree(gbpsy->manufacturer);
|
kfree(gbpsy->props_raw);
|
kfree(gbpsy->props);
|
}
|
|
static void _gb_power_supply_release(struct gb_power_supply *gbpsy)
|
{
|
gbpsy->update_interval = 0;
|
|
cancel_delayed_work_sync(&gbpsy->work);
|
|
if (gbpsy->registered)
|
power_supply_unregister(gbpsy->psy);
|
|
_gb_power_supply_free(gbpsy);
|
}
|
|
static void _gb_power_supplies_release(struct gb_power_supplies *supplies)
|
{
|
int i;
|
|
if (!supplies->supply)
|
return;
|
|
mutex_lock(&supplies->supplies_lock);
|
for (i = 0; i < supplies->supplies_count; i++)
|
_gb_power_supply_release(&supplies->supply[i]);
|
kfree(supplies->supply);
|
mutex_unlock(&supplies->supplies_lock);
|
kfree(supplies);
|
}
|
|
static int gb_power_supplies_get_count(struct gb_power_supplies *supplies)
|
{
|
struct gb_power_supply_get_supplies_response resp;
|
int ret;
|
|
ret = gb_operation_sync(supplies->connection,
|
GB_POWER_SUPPLY_TYPE_GET_SUPPLIES,
|
NULL, 0, &resp, sizeof(resp));
|
if (ret < 0)
|
return ret;
|
|
if (!resp.supplies_count)
|
return -EINVAL;
|
|
supplies->supplies_count = resp.supplies_count;
|
|
return ret;
|
}
|
|
static int gb_power_supply_config(struct gb_power_supplies *supplies, int id)
|
{
|
struct gb_power_supply *gbpsy = &supplies->supply[id];
|
int ret;
|
|
gbpsy->supplies = supplies;
|
gbpsy->id = id;
|
|
ret = gb_power_supply_description_get(gbpsy);
|
if (ret < 0)
|
return ret;
|
|
return gb_power_supply_prop_descriptors_get(gbpsy);
|
}
|
|
static int gb_power_supply_enable(struct gb_power_supply *gbpsy)
|
{
|
int ret;
|
|
/* guarantee that we have an unique name, before register */
|
ret = __gb_power_supply_set_name(gbpsy->model_name, gbpsy->name,
|
sizeof(gbpsy->name));
|
if (ret < 0)
|
return ret;
|
|
mutex_init(&gbpsy->supply_lock);
|
|
ret = gb_power_supply_register(gbpsy);
|
if (ret < 0)
|
return ret;
|
|
gbpsy->update_interval = update_interval_init;
|
INIT_DELAYED_WORK(&gbpsy->work, gb_power_supply_work);
|
schedule_delayed_work(&gbpsy->work, 0);
|
|
/* everything went fine, mark it for release code to know */
|
gbpsy->registered = true;
|
|
return 0;
|
}
|
|
static int gb_power_supplies_setup(struct gb_power_supplies *supplies)
|
{
|
struct gb_connection *connection = supplies->connection;
|
int ret;
|
int i;
|
|
mutex_lock(&supplies->supplies_lock);
|
|
ret = gb_power_supplies_get_count(supplies);
|
if (ret < 0)
|
goto out;
|
|
supplies->supply = kcalloc(supplies->supplies_count,
|
sizeof(struct gb_power_supply),
|
GFP_KERNEL);
|
|
if (!supplies->supply) {
|
ret = -ENOMEM;
|
goto out;
|
}
|
|
for (i = 0; i < supplies->supplies_count; i++) {
|
ret = gb_power_supply_config(supplies, i);
|
if (ret < 0) {
|
dev_err(&connection->bundle->dev,
|
"Fail to configure supplies devices\n");
|
goto out;
|
}
|
}
|
out:
|
mutex_unlock(&supplies->supplies_lock);
|
return ret;
|
}
|
|
static int gb_power_supplies_register(struct gb_power_supplies *supplies)
|
{
|
struct gb_connection *connection = supplies->connection;
|
int ret = 0;
|
int i;
|
|
mutex_lock(&supplies->supplies_lock);
|
|
for (i = 0; i < supplies->supplies_count; i++) {
|
ret = gb_power_supply_enable(&supplies->supply[i]);
|
if (ret < 0) {
|
dev_err(&connection->bundle->dev,
|
"Fail to enable supplies devices\n");
|
break;
|
}
|
}
|
|
mutex_unlock(&supplies->supplies_lock);
|
return ret;
|
}
|
|
static int gb_supplies_request_handler(struct gb_operation *op)
|
{
|
struct gb_connection *connection = op->connection;
|
struct gb_power_supplies *supplies = gb_connection_get_data(connection);
|
struct gb_power_supply *gbpsy;
|
struct gb_message *request;
|
struct gb_power_supply_event_request *payload;
|
u8 psy_id;
|
u8 event;
|
int ret = 0;
|
|
if (op->type != GB_POWER_SUPPLY_TYPE_EVENT) {
|
dev_err(&connection->bundle->dev,
|
"Unsupported unsolicited event: %u\n", op->type);
|
return -EINVAL;
|
}
|
|
request = op->request;
|
|
if (request->payload_size < sizeof(*payload)) {
|
dev_err(&connection->bundle->dev,
|
"Wrong event size received (%zu < %zu)\n",
|
request->payload_size, sizeof(*payload));
|
return -EINVAL;
|
}
|
|
payload = request->payload;
|
psy_id = payload->psy_id;
|
mutex_lock(&supplies->supplies_lock);
|
if (psy_id >= supplies->supplies_count ||
|
!supplies->supply[psy_id].registered) {
|
dev_err(&connection->bundle->dev,
|
"Event received for unconfigured power_supply id: %d\n",
|
psy_id);
|
ret = -EINVAL;
|
goto out_unlock;
|
}
|
|
event = payload->event;
|
/*
|
* we will only handle events after setup is done and before release is
|
* running. For that just check update_interval.
|
*/
|
gbpsy = &supplies->supply[psy_id];
|
if (!gbpsy->update_interval) {
|
ret = -ESHUTDOWN;
|
goto out_unlock;
|
}
|
|
if (event & GB_POWER_SUPPLY_UPDATE) {
|
/*
|
* we need to make sure we invalidate cache, if not no new
|
* values for the properties will be fetch and the all propose
|
* of this event is missed
|
*/
|
gbpsy->cache_invalid = 1;
|
gb_power_supply_status_update(gbpsy);
|
}
|
|
out_unlock:
|
mutex_unlock(&supplies->supplies_lock);
|
return ret;
|
}
|
|
static int gb_power_supply_probe(struct gb_bundle *bundle,
|
const struct greybus_bundle_id *id)
|
{
|
struct greybus_descriptor_cport *cport_desc;
|
struct gb_connection *connection;
|
struct gb_power_supplies *supplies;
|
int ret;
|
|
if (bundle->num_cports != 1)
|
return -ENODEV;
|
|
cport_desc = &bundle->cport_desc[0];
|
if (cport_desc->protocol_id != GREYBUS_PROTOCOL_POWER_SUPPLY)
|
return -ENODEV;
|
|
supplies = kzalloc(sizeof(*supplies), GFP_KERNEL);
|
if (!supplies)
|
return -ENOMEM;
|
|
connection = gb_connection_create(bundle, le16_to_cpu(cport_desc->id),
|
gb_supplies_request_handler);
|
if (IS_ERR(connection)) {
|
ret = PTR_ERR(connection);
|
goto out;
|
}
|
|
supplies->connection = connection;
|
gb_connection_set_data(connection, supplies);
|
|
mutex_init(&supplies->supplies_lock);
|
|
greybus_set_drvdata(bundle, supplies);
|
|
/* We aren't ready to receive an incoming request yet */
|
ret = gb_connection_enable_tx(connection);
|
if (ret)
|
goto error_connection_destroy;
|
|
ret = gb_power_supplies_setup(supplies);
|
if (ret < 0)
|
goto error_connection_disable;
|
|
/* We are ready to receive an incoming request now, enable RX as well */
|
ret = gb_connection_enable(connection);
|
if (ret)
|
goto error_connection_disable;
|
|
ret = gb_power_supplies_register(supplies);
|
if (ret < 0)
|
goto error_connection_disable;
|
|
gb_pm_runtime_put_autosuspend(bundle);
|
return 0;
|
|
error_connection_disable:
|
gb_connection_disable(connection);
|
error_connection_destroy:
|
gb_connection_destroy(connection);
|
out:
|
_gb_power_supplies_release(supplies);
|
return ret;
|
}
|
|
static void gb_power_supply_disconnect(struct gb_bundle *bundle)
|
{
|
struct gb_power_supplies *supplies = greybus_get_drvdata(bundle);
|
|
gb_connection_disable(supplies->connection);
|
gb_connection_destroy(supplies->connection);
|
|
_gb_power_supplies_release(supplies);
|
}
|
|
static const struct greybus_bundle_id gb_power_supply_id_table[] = {
|
{ GREYBUS_DEVICE_CLASS(GREYBUS_CLASS_POWER_SUPPLY) },
|
{ }
|
};
|
MODULE_DEVICE_TABLE(greybus, gb_power_supply_id_table);
|
|
static struct greybus_driver gb_power_supply_driver = {
|
.name = "power_supply",
|
.probe = gb_power_supply_probe,
|
.disconnect = gb_power_supply_disconnect,
|
.id_table = gb_power_supply_id_table,
|
};
|
module_greybus_driver(gb_power_supply_driver);
|
|
MODULE_LICENSE("GPL v2");
|
