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greybus: add battery module
This commit is contained in:
parent
43cc32a2ab
commit
33ea3a3f56
4 changed files with 167 additions and 1 deletions
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@ -6,7 +6,8 @@ greybus-y := core.o \
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i2c-gb.o \
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gpio-gb.o \
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sdio-gb.o \
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uart-gb.o
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uart-gb.o \
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battery-gb.o
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obj-m += greybus.o
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obj-m += es1-ap-usb.o
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153
drivers/staging/greybus/battery-gb.c
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153
drivers/staging/greybus/battery-gb.c
Normal file
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@ -0,0 +1,153 @@
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/*
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* Battery driver for a Greybus module.
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*
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* Copyright 2014 Google Inc.
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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/slab.h>
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#include <linux/power_supply.h>
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#include "greybus.h"
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struct gb_battery {
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struct power_supply bat;
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struct greybus_device *gdev;
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};
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#define to_gb_battery(x) container_of(x, struct gb_battery, bat)
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static const struct greybus_module_id id_table[] = {
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{ GREYBUS_DEVICE(0x42, 0x42) }, /* make shit up */
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{ }, /* terminating NULL entry */
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};
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static int get_status(struct gb_battery *gb)
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{
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// FIXME!!!
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return 0;
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}
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static int get_capacity(struct gb_battery *gb)
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{
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// FIXME!!!
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return 0;
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}
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static int get_temp(struct gb_battery *gb)
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{
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// FIXME!!!
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return 0;
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}
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static int get_voltage(struct gb_battery *gb)
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{
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// FIXME!!!
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return 0;
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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_battery *gb = to_gb_battery(b);
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switch (psp) {
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case POWER_SUPPLY_PROP_TECHNOLOGY:
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// FIXME - guess!
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val->intval = POWER_SUPPLY_TECHNOLOGY_NiMH;
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break;
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case POWER_SUPPLY_PROP_STATUS:
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val->intval = get_status(gb);
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break;
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case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
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val->intval = 4700000; // FIXME - guess???
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break;
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case POWER_SUPPLY_PROP_CAPACITY:
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val->intval = get_capacity(gb);
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break;
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case POWER_SUPPLY_PROP_TEMP:
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val->intval = get_temp(gb);
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break;
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case POWER_SUPPLY_PROP_VOLTAGE_NOW:
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val->intval = get_voltage(gb);
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break;
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default:
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return -EINVAL;
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}
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return 0;
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}
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// FIXME - verify this list, odds are some can be removed and others added.
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static enum power_supply_property battery_props[] = {
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POWER_SUPPLY_PROP_TECHNOLOGY,
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POWER_SUPPLY_PROP_STATUS,
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POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,
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POWER_SUPPLY_PROP_CAPACITY,
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POWER_SUPPLY_PROP_TEMP,
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POWER_SUPPLY_PROP_VOLTAGE_NOW,
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};
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int gb_battery_probe(struct greybus_device *gdev,
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const struct greybus_module_id *id)
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{
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struct gb_battery *gb;
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struct power_supply *b;
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int retval;
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gb = kzalloc(sizeof(*gb), GFP_KERNEL);
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if (!gb)
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return -ENOMEM;
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b = &gb->bat;
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// FIXME - get a better (i.e. unique) name
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// FIXME - anything else needs to be set?
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b->name = "gb_battery";
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b->type = POWER_SUPPLY_TYPE_BATTERY,
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b->properties = battery_props,
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b->num_properties = ARRAY_SIZE(battery_props),
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b->get_property = get_property,
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retval = power_supply_register(&gdev->dev, b);
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if (retval) {
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kfree(gb);
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return retval;
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}
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gdev->gb_battery = gb;
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return 0;
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}
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void gb_battery_disconnect(struct greybus_device *gdev)
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{
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struct gb_battery *gb;
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gb = gdev->gb_battery;
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power_supply_unregister(&gb->bat);
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kfree(gb);
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}
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#if 0
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static struct greybus_driver battery_gb_driver = {
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.probe = gb_battery_probe,
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.disconnect = gb_battery_disconnect,
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.id_table = id_table,
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};
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module_greybus_driver(battery_gb_driver);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Greg Kroah-Hartman <gregkh@linuxfoundation.org>");
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#endif
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@ -210,8 +210,15 @@ static int gb_init_subdevs(struct greybus_device *gdev,
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retval = gb_tty_probe(gdev, id);
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if (retval)
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goto error_tty;
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retval = gb_battery_probe(gdev, id);
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if (retval)
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goto error_battery;
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return 0;
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error_battery:
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gb_tty_disconnect(gdev);
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error_tty:
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gb_sdio_disconnect(gdev);
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@ -444,6 +451,7 @@ void greybus_remove_device(struct greybus_device *gdev)
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gb_gpio_disconnect(gdev);
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gb_sdio_disconnect(gdev);
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gb_tty_disconnect(gdev);
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gb_battery_disconnect(gdev);
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// FIXME - device_remove(&gdev->dev);
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}
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@ -91,6 +91,7 @@ struct gb_gpio_device;
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struct gb_sdio_host;
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struct gb_tty;
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struct gb_usb_device;
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struct gb_battery;
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struct greybus_host_device;
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struct svc_msg;
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@ -142,6 +143,7 @@ struct greybus_device {
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struct gb_sdio_host *gb_sdio_host;
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struct gb_tty *gb_tty;
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struct gb_usb_device *gb_usb_dev;
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struct gb_battery *gb_battery;
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};
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#define to_greybus_device(d) container_of(d, struct greybus_device, dev)
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@ -237,6 +239,8 @@ int gb_sdio_probe(struct greybus_device *gdev, const struct greybus_module_id *i
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void gb_sdio_disconnect(struct greybus_device *gdev);
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int gb_tty_probe(struct greybus_device *gdev, const struct greybus_module_id *id);
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void gb_tty_disconnect(struct greybus_device *gdev);
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int gb_battery_probe(struct greybus_device *gdev, const struct greybus_module_id *id);
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void gb_battery_disconnect(struct greybus_device *gdev);
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int gb_tty_init(void);
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void gb_tty_exit(void);
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