769 lines
18 KiB
C
769 lines
18 KiB
C
/*
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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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* Released under the GPLv2 only.
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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 "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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u32 val;
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u32 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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#ifdef DRIVER_OWNS_PSY_STRUCT
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struct power_supply psy;
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#define to_gb_power_supply(x) container_of(x, struct gb_power_supply, psy)
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#else
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struct power_supply *psy;
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struct power_supply_desc desc;
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#define to_gb_power_supply(x) power_supply_get_drvdata(x)
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#endif
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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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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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};
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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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/* 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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};
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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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},
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{ .prop = GB_POWER_SUPPLY_PROP_TEMP,
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.tolerance_change = 500,
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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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},
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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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{
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struct gb_power_supply_prop *prop;
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prop = get_psy_prop(gbpsy, psp);
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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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{
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if (gbpsy->update_interval == update_interval_max)
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return;
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/* do some exponential back-off in the update interval */
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gbpsy->update_interval *= 2;
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if (gbpsy->update_interval > update_interval_max)
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gbpsy->update_interval = update_interval_max;
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}
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#ifdef DRIVER_OWNS_PSY_STRUCT
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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);
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}
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#else
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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);
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}
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#endif
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static void check_changed(struct gb_power_supply *gbpsy,
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struct gb_power_supply_prop *prop)
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{
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const struct gb_power_supply_changes *psyc;
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u32 val = prop->val;
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u32 prev_val = prop->previous_val;
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int i;
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for (i = 0; i < ARRAY_SIZE(psy_props_changes); i++) {
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psyc = &psy_props_changes[i];
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if (prop->prop == psyc->prop) {
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if (!psyc->tolerance_change)
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gbpsy->changed = true;
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else if (val < prev_val &&
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prev_val - val > psyc->tolerance_change)
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gbpsy->changed = true;
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else if (val > prev_val &&
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val - prev_val > psyc->tolerance_change)
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gbpsy->changed = true;
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break;
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}
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}
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}
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static int total_props(struct gb_power_supply *gbpsy)
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{
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/* this return the intval plus the strval properties */
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return (gbpsy->properties_count + gbpsy->properties_count_str);
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}
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static void prop_append(struct gb_power_supply *gbpsy,
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enum power_supply_property prop)
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{
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enum power_supply_property *new_props_raw;
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gbpsy->properties_count_str++;
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new_props_raw = krealloc(gbpsy->props_raw, total_props(gbpsy) *
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sizeof(enum power_supply_property),
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GFP_KERNEL);
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if (!new_props_raw)
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return;
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gbpsy->props_raw = new_props_raw;
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gbpsy->props_raw[total_props(gbpsy) - 1] = prop;
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}
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static int __gb_power_supply_set_name(char *init_name, char *name, size_t len)
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{
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unsigned int i = 0;
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int ret = 0;
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struct power_supply *psy;
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if (!strlen(init_name))
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init_name = "gb_power_supply";
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strlcpy(name, init_name, len);
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while ((ret < len) && (psy = power_supply_get_by_name(name))) {
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#ifdef PSY_HAVE_PUT
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power_supply_put(psy);
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#endif
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ret = snprintf(name, len, "%s_%u", init_name, ++i);
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}
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if (ret >= len)
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return -ENOMEM;
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return i;
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}
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static void _gb_power_supply_append_props(struct gb_power_supply *gbpsy)
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{
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if (strlen(gbpsy->manufacturer))
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prop_append(gbpsy, POWER_SUPPLY_PROP_MANUFACTURER);
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if (strlen(gbpsy->model_name))
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prop_append(gbpsy, POWER_SUPPLY_PROP_MODEL_NAME);
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if (strlen(gbpsy->serial_number))
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prop_append(gbpsy, POWER_SUPPLY_PROP_SERIAL_NUMBER);
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}
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static int gb_power_supply_description_get(struct gb_power_supply *gbpsy)
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{
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struct gb_connection *connection = get_conn_from_psy(gbpsy);
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struct gb_power_supply_get_description_request req;
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struct gb_power_supply_get_description_response resp;
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int ret;
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req.psy_id = gbpsy->id;
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ret = gb_operation_sync(connection,
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GB_POWER_SUPPLY_TYPE_GET_DESCRIPTION,
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&req, sizeof(req), &resp, sizeof(resp));
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if (ret < 0)
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return ret;
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gbpsy->manufacturer = kstrndup(resp.manufacturer, PROP_MAX, GFP_KERNEL);
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if (!gbpsy->manufacturer)
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return -ENOMEM;
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gbpsy->model_name = kstrndup(resp.model, PROP_MAX, GFP_KERNEL);
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if (!gbpsy->model_name)
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return -ENOMEM;
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gbpsy->serial_number = kstrndup(resp.serial_number, PROP_MAX,
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GFP_KERNEL);
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if (!gbpsy->serial_number)
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return -ENOMEM;
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gbpsy->type = le16_to_cpu(resp.type);
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gbpsy->properties_count = resp.properties_count;
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return 0;
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}
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static int gb_power_supply_prop_descriptors_get(struct gb_power_supply *gbpsy)
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{
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struct gb_connection *connection = get_conn_from_psy(gbpsy);
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struct gb_power_supply_get_property_descriptors_request req;
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struct gb_power_supply_get_property_descriptors_response resp;
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int ret;
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int i;
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if (gbpsy->properties_count == 0)
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return 0;
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req.psy_id = gbpsy->id;
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ret = gb_operation_sync(connection,
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GB_POWER_SUPPLY_TYPE_GET_PROP_DESCRIPTORS,
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&req, sizeof(req), &resp,
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sizeof(resp) + gbpsy->properties_count *
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sizeof(struct gb_power_supply_props_desc));
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if (ret < 0)
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return ret;
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gbpsy->props = kcalloc(gbpsy->properties_count, sizeof(*gbpsy->props),
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GFP_KERNEL);
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if (!gbpsy->props)
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return -ENOMEM;
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gbpsy->props_raw = kzalloc(gbpsy->properties_count *
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sizeof(*gbpsy->props_raw), GFP_KERNEL);
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if (!gbpsy->props_raw)
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return -ENOMEM;
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/* Store available properties */
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for (i = 0; i < gbpsy->properties_count; i++) {
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gbpsy->props[i].prop = resp.props[i].property;
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gbpsy->props_raw[i] = resp.props[i].property;
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if (resp.props[i].is_writeable)
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gbpsy->props[i].is_writeable = true;
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}
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/*
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* now append the properties that we already got information in the
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* get_description operation. (char * ones)
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*/
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_gb_power_supply_append_props(gbpsy);
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return 0;
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}
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static int __gb_power_supply_property_update(struct gb_power_supply *gbpsy,
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enum power_supply_property psp)
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{
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struct gb_connection *connection = get_conn_from_psy(gbpsy);
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struct gb_power_supply_prop *prop;
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struct gb_power_supply_get_property_request req;
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struct gb_power_supply_get_property_response resp;
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u32 val;
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int ret;
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prop = get_psy_prop(gbpsy, psp);
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if (!prop)
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return -EINVAL;
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req.psy_id = gbpsy->id;
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req.property = (u8)psp;
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ret = gb_operation_sync(connection, GB_POWER_SUPPLY_TYPE_GET_PROPERTY,
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&req, sizeof(req), &resp, sizeof(resp));
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if (ret < 0)
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return ret;
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val = le32_to_cpu(resp.prop_val);
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if (val == prop->val)
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return 0;
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prop->previous_val = prop->val;
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prop->val = val;
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check_changed(gbpsy, prop);
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return 0;
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}
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static int __gb_power_supply_property_get(struct gb_power_supply *gbpsy,
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enum power_supply_property psp,
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union power_supply_propval *val)
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{
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struct gb_power_supply_prop *prop;
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prop = get_psy_prop(gbpsy, psp);
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if (!prop)
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return -EINVAL;
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val->intval = prop->val;
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return 0;
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}
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static int __gb_power_supply_property_strval_get(struct gb_power_supply *gbpsy,
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enum power_supply_property psp,
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union power_supply_propval *val)
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{
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switch (psp) {
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case POWER_SUPPLY_PROP_MODEL_NAME:
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val->strval = gbpsy->model_name;
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break;
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case POWER_SUPPLY_PROP_MANUFACTURER:
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val->strval = gbpsy->manufacturer;
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break;
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case POWER_SUPPLY_PROP_SERIAL_NUMBER:
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val->strval = gbpsy->serial_number;
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break;
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default:
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break;
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}
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return 0;
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}
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static int _gb_power_supply_property_get(struct gb_power_supply *gbpsy,
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enum power_supply_property psp,
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union power_supply_propval *val)
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{
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struct gb_connection *connection = get_conn_from_psy(gbpsy);
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int ret;
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/*
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* Properties of type const char *, were already fetched on
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* get_description operation and should be cached in gb
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*/
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if (is_prop_valint(psp))
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ret = __gb_power_supply_property_get(gbpsy, psp, val);
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else
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ret = __gb_power_supply_property_strval_get(gbpsy, psp, val);
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if (ret < 0)
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dev_err(&connection->bundle->dev, "get property %u\n", psp);
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return 0;
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}
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static int gb_power_supply_status_get(struct gb_power_supply *gbpsy)
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{
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int ret = 0;
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int i;
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/* check if cache is good enough */
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if (gbpsy->last_update &&
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time_is_after_jiffies(gbpsy->last_update +
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msecs_to_jiffies(cache_time)))
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return 0;
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for (i = 0; i < gbpsy->properties_count; i++) {
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ret = __gb_power_supply_property_update(gbpsy,
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gbpsy->props[i].prop);
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if (ret < 0)
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break;
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}
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if (ret == 0)
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gbpsy->last_update = jiffies;
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return ret;
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}
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static void gb_power_supply_status_update(struct gb_power_supply *gbpsy)
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{
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/* check if there a change that need to be reported */
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gb_power_supply_status_get(gbpsy);
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if (!gbpsy->changed)
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return;
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gbpsy->update_interval = update_interval_init;
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__gb_power_supply_changed(gbpsy);
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gbpsy->changed = false;
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}
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static void gb_power_supply_work(struct work_struct *work)
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{
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struct gb_power_supply *gbpsy = container_of(work,
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struct gb_power_supply,
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work.work);
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/*
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* if the poll interval is not set, disable polling, this is helpful
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* specially at unregister time.
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*/
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if (!gbpsy->update_interval)
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return;
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gb_power_supply_status_update(gbpsy);
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next_interval(gbpsy);
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schedule_delayed_work(&gbpsy->work, gbpsy->update_interval);
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}
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static int get_property(struct power_supply *b,
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enum power_supply_property psp,
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union power_supply_propval *val)
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{
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struct gb_power_supply *gbpsy = to_gb_power_supply(b);
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gb_power_supply_status_get(gbpsy);
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return _gb_power_supply_property_get(gbpsy, psp, val);
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}
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static int gb_power_supply_property_set(struct gb_power_supply *gbpsy,
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enum power_supply_property psp,
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int val)
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{
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struct gb_connection *connection = get_conn_from_psy(gbpsy);
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struct gb_power_supply_prop *prop;
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struct gb_power_supply_set_property_request req;
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int ret;
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prop = get_psy_prop(gbpsy, psp);
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if (!prop)
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return -EINVAL;
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req.psy_id = gbpsy->id;
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req.property = (u8)psp;
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req.prop_val = cpu_to_le32(val);
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ret = gb_operation_sync(connection, GB_POWER_SUPPLY_TYPE_SET_PROPERTY,
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&req, sizeof(req), NULL, 0);
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if (ret < 0)
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goto out;
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/* cache immediately the new value */
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prop->val = val;
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out:
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return ret;
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}
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|
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static int set_property(struct power_supply *b,
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enum power_supply_property psp,
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const union power_supply_propval *val)
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{
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struct gb_power_supply *gbpsy = to_gb_power_supply(b);
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return gb_power_supply_property_set(gbpsy, psp, val->intval);
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}
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|
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static int property_is_writeable(struct power_supply *b,
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enum power_supply_property psp)
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{
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struct gb_power_supply *gbpsy = to_gb_power_supply(b);
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return is_psy_prop_writeable(gbpsy, psp);
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}
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|
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|
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#ifdef DRIVER_OWNS_PSY_STRUCT
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static int gb_power_supply_register(struct gb_power_supply *gbpsy)
|
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{
|
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struct gb_connection *connection = get_conn_from_psy(gbpsy);
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gbpsy->psy.name = gbpsy->name;
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gbpsy->psy.type = gbpsy->type;
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gbpsy->psy.properties = gbpsy->props_raw;
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gbpsy->psy.num_properties = total_props(gbpsy);
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gbpsy->psy.get_property = get_property;
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gbpsy->psy.set_property = set_property;
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gbpsy->psy.property_is_writeable = property_is_writeable;
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|
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return power_supply_register(&connection->bundle->dev,
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&gbpsy->psy);
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}
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#else
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static int gb_power_supply_register(struct gb_power_supply *gbpsy)
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{
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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);
|
|
if (IS_ERR(gbpsy->psy))
|
|
return PTR_ERR(gbpsy->psy);
|
|
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
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);
|
|
#ifdef DRIVER_OWNS_PSY_STRUCT
|
|
if (gbpsy->registered)
|
|
power_supply_unregister(&gbpsy->psy);
|
|
#else
|
|
if (gbpsy->registered)
|
|
power_supply_unregister(gbpsy->psy);
|
|
#endif
|
|
|
|
_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)
|
|
goto out;
|
|
|
|
ret = gb_power_supply_prop_descriptors_get(gbpsy);
|
|
if (ret < 0)
|
|
goto out;
|
|
|
|
/* 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)
|
|
goto out;
|
|
|
|
ret = gb_power_supply_register(gbpsy);
|
|
if (ret < 0)
|
|
goto out;
|
|
|
|
gbpsy->update_interval = update_interval_init;
|
|
INIT_DELAYED_WORK(&gbpsy->work, gb_power_supply_work);
|
|
schedule_delayed_work(&gbpsy->work, 0);
|
|
|
|
out:
|
|
/* if everything went fine just mark it for release code to know */
|
|
if (ret == 0)
|
|
gbpsy->registered = true;
|
|
return ret;
|
|
}
|
|
|
|
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 = kzalloc(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_supply_event_recv(u8 type, struct gb_operation *op)
|
|
{
|
|
struct gb_connection *connection = op->connection;
|
|
struct gb_power_supplies *supplies = connection->private;
|
|
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 (type != GB_POWER_SUPPLY_TYPE_EVENT) {
|
|
dev_err(&connection->bundle->dev,
|
|
"Unsupported unsolicited event: %u\n", 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)
|
|
gb_power_supply_status_update(gbpsy);
|
|
|
|
out_unlock:
|
|
mutex_unlock(&supplies->supplies_lock);
|
|
return ret;
|
|
}
|
|
|
|
static int gb_power_supply_connection_init(struct gb_connection *connection)
|
|
{
|
|
struct gb_power_supplies *supplies;
|
|
int ret;
|
|
|
|
supplies = kzalloc(sizeof(*supplies), GFP_KERNEL);
|
|
if (!supplies)
|
|
return -ENOMEM;
|
|
|
|
supplies->connection = connection;
|
|
connection->private = supplies;
|
|
|
|
mutex_init(&supplies->supplies_lock);
|
|
|
|
ret = gb_power_supplies_setup(supplies);
|
|
if (ret < 0)
|
|
_gb_power_supplies_release(supplies);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void gb_power_supply_connection_exit(struct gb_connection *connection)
|
|
{
|
|
struct gb_power_supplies *supplies = connection->private;
|
|
|
|
_gb_power_supplies_release(supplies);
|
|
}
|
|
|
|
static struct gb_protocol power_supply_protocol = {
|
|
.name = "power_supply",
|
|
.id = GREYBUS_PROTOCOL_POWER_SUPPLY,
|
|
.major = GB_POWER_SUPPLY_VERSION_MAJOR,
|
|
.minor = GB_POWER_SUPPLY_VERSION_MINOR,
|
|
.connection_init = gb_power_supply_connection_init,
|
|
.connection_exit = gb_power_supply_connection_exit,
|
|
.request_recv = gb_power_supply_event_recv,
|
|
};
|
|
|
|
gb_protocol_driver(&power_supply_protocol);
|
|
|
|
MODULE_LICENSE("GPL v2");
|