331 lines
8 KiB
C
331 lines
8 KiB
C
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/*
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* Battery measurement code for Zipit Z2
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*
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* Copyright (C) 2009 Peter Edwards <sweetlilmre@gmail.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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*/
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#include <linux/module.h>
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#include <linux/gpio.h>
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#include <linux/i2c.h>
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#include <linux/interrupt.h>
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#include <linux/irq.h>
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#include <linux/power_supply.h>
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#include <linux/slab.h>
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#include <linux/z2_battery.h>
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#define Z2_DEFAULT_NAME "Z2"
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struct z2_charger {
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struct z2_battery_info *info;
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int bat_status;
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struct i2c_client *client;
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struct power_supply *batt_ps;
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struct power_supply_desc batt_ps_desc;
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struct mutex work_lock;
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struct work_struct bat_work;
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};
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static unsigned long z2_read_bat(struct z2_charger *charger)
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{
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int data;
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data = i2c_smbus_read_byte_data(charger->client,
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charger->info->batt_I2C_reg);
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if (data < 0)
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return 0;
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return data * charger->info->batt_mult / charger->info->batt_div;
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}
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static int z2_batt_get_property(struct power_supply *batt_ps,
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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 z2_charger *charger = power_supply_get_drvdata(batt_ps);
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struct z2_battery_info *info = charger->info;
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switch (psp) {
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case POWER_SUPPLY_PROP_STATUS:
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val->intval = charger->bat_status;
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break;
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case POWER_SUPPLY_PROP_TECHNOLOGY:
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val->intval = info->batt_tech;
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break;
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case POWER_SUPPLY_PROP_VOLTAGE_NOW:
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if (info->batt_I2C_reg >= 0)
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val->intval = z2_read_bat(charger);
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else
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return -EINVAL;
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break;
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case POWER_SUPPLY_PROP_VOLTAGE_MAX:
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if (info->max_voltage >= 0)
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val->intval = info->max_voltage;
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else
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return -EINVAL;
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break;
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case POWER_SUPPLY_PROP_VOLTAGE_MIN:
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if (info->min_voltage >= 0)
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val->intval = info->min_voltage;
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else
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return -EINVAL;
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break;
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case POWER_SUPPLY_PROP_PRESENT:
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val->intval = 1;
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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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static void z2_batt_ext_power_changed(struct power_supply *batt_ps)
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{
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struct z2_charger *charger = power_supply_get_drvdata(batt_ps);
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schedule_work(&charger->bat_work);
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}
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static void z2_batt_update(struct z2_charger *charger)
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{
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int old_status = charger->bat_status;
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struct z2_battery_info *info;
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info = charger->info;
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mutex_lock(&charger->work_lock);
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charger->bat_status = (info->charge_gpio >= 0) ?
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(gpio_get_value(info->charge_gpio) ?
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POWER_SUPPLY_STATUS_CHARGING :
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POWER_SUPPLY_STATUS_DISCHARGING) :
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POWER_SUPPLY_STATUS_UNKNOWN;
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if (old_status != charger->bat_status) {
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pr_debug("%s: %i -> %i\n", charger->batt_ps->desc->name,
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old_status,
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charger->bat_status);
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power_supply_changed(charger->batt_ps);
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}
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mutex_unlock(&charger->work_lock);
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}
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static void z2_batt_work(struct work_struct *work)
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{
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struct z2_charger *charger;
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charger = container_of(work, struct z2_charger, bat_work);
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z2_batt_update(charger);
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}
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static irqreturn_t z2_charge_switch_irq(int irq, void *devid)
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{
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struct z2_charger *charger = devid;
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schedule_work(&charger->bat_work);
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return IRQ_HANDLED;
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}
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static int z2_batt_ps_init(struct z2_charger *charger, int props)
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{
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int i = 0;
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enum power_supply_property *prop;
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struct z2_battery_info *info = charger->info;
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if (info->charge_gpio >= 0)
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props++; /* POWER_SUPPLY_PROP_STATUS */
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if (info->batt_tech >= 0)
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props++; /* POWER_SUPPLY_PROP_TECHNOLOGY */
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if (info->batt_I2C_reg >= 0)
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props++; /* POWER_SUPPLY_PROP_VOLTAGE_NOW */
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if (info->max_voltage >= 0)
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props++; /* POWER_SUPPLY_PROP_VOLTAGE_MAX */
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if (info->min_voltage >= 0)
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props++; /* POWER_SUPPLY_PROP_VOLTAGE_MIN */
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prop = kcalloc(props, sizeof(*prop), GFP_KERNEL);
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if (!prop)
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return -ENOMEM;
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prop[i++] = POWER_SUPPLY_PROP_PRESENT;
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if (info->charge_gpio >= 0)
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prop[i++] = POWER_SUPPLY_PROP_STATUS;
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if (info->batt_tech >= 0)
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prop[i++] = POWER_SUPPLY_PROP_TECHNOLOGY;
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if (info->batt_I2C_reg >= 0)
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prop[i++] = POWER_SUPPLY_PROP_VOLTAGE_NOW;
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if (info->max_voltage >= 0)
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prop[i++] = POWER_SUPPLY_PROP_VOLTAGE_MAX;
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if (info->min_voltage >= 0)
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prop[i++] = POWER_SUPPLY_PROP_VOLTAGE_MIN;
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if (!info->batt_name) {
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dev_info(&charger->client->dev,
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"Please consider setting proper battery "
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"name in platform definition file, falling "
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"back to name \" Z2_DEFAULT_NAME \"\n");
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charger->batt_ps_desc.name = Z2_DEFAULT_NAME;
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} else
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charger->batt_ps_desc.name = info->batt_name;
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charger->batt_ps_desc.properties = prop;
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charger->batt_ps_desc.num_properties = props;
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charger->batt_ps_desc.type = POWER_SUPPLY_TYPE_BATTERY;
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charger->batt_ps_desc.get_property = z2_batt_get_property;
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charger->batt_ps_desc.external_power_changed =
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z2_batt_ext_power_changed;
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charger->batt_ps_desc.use_for_apm = 1;
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return 0;
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}
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static int z2_batt_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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int ret = 0;
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int props = 1; /* POWER_SUPPLY_PROP_PRESENT */
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struct z2_charger *charger;
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struct z2_battery_info *info = client->dev.platform_data;
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struct power_supply_config psy_cfg = {};
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if (info == NULL) {
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dev_err(&client->dev,
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"Please set platform device platform_data"
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" to a valid z2_battery_info pointer!\n");
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return -EINVAL;
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}
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charger = kzalloc(sizeof(*charger), GFP_KERNEL);
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if (charger == NULL)
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return -ENOMEM;
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charger->bat_status = POWER_SUPPLY_STATUS_UNKNOWN;
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charger->info = info;
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charger->client = client;
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i2c_set_clientdata(client, charger);
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psy_cfg.drv_data = charger;
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mutex_init(&charger->work_lock);
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if (info->charge_gpio >= 0 && gpio_is_valid(info->charge_gpio)) {
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ret = gpio_request(info->charge_gpio, "BATT CHRG");
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if (ret)
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goto err;
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ret = gpio_direction_input(info->charge_gpio);
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if (ret)
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goto err2;
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irq_set_irq_type(gpio_to_irq(info->charge_gpio),
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IRQ_TYPE_EDGE_BOTH);
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ret = request_irq(gpio_to_irq(info->charge_gpio),
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z2_charge_switch_irq, 0,
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"AC Detect", charger);
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if (ret)
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goto err3;
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}
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ret = z2_batt_ps_init(charger, props);
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if (ret)
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goto err3;
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INIT_WORK(&charger->bat_work, z2_batt_work);
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charger->batt_ps = power_supply_register(&client->dev,
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&charger->batt_ps_desc,
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&psy_cfg);
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if (IS_ERR(charger->batt_ps)) {
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ret = PTR_ERR(charger->batt_ps);
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goto err4;
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}
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schedule_work(&charger->bat_work);
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return 0;
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err4:
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kfree(charger->batt_ps_desc.properties);
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err3:
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if (info->charge_gpio >= 0 && gpio_is_valid(info->charge_gpio))
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free_irq(gpio_to_irq(info->charge_gpio), charger);
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err2:
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if (info->charge_gpio >= 0 && gpio_is_valid(info->charge_gpio))
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gpio_free(info->charge_gpio);
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err:
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kfree(charger);
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return ret;
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}
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static int z2_batt_remove(struct i2c_client *client)
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{
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struct z2_charger *charger = i2c_get_clientdata(client);
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struct z2_battery_info *info = charger->info;
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cancel_work_sync(&charger->bat_work);
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power_supply_unregister(charger->batt_ps);
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kfree(charger->batt_ps_desc.properties);
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if (info->charge_gpio >= 0 && gpio_is_valid(info->charge_gpio)) {
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free_irq(gpio_to_irq(info->charge_gpio), charger);
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gpio_free(info->charge_gpio);
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}
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kfree(charger);
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return 0;
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}
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#ifdef CONFIG_PM
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static int z2_batt_suspend(struct device *dev)
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{
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struct i2c_client *client = to_i2c_client(dev);
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struct z2_charger *charger = i2c_get_clientdata(client);
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flush_work(&charger->bat_work);
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return 0;
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}
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static int z2_batt_resume(struct device *dev)
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{
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struct i2c_client *client = to_i2c_client(dev);
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struct z2_charger *charger = i2c_get_clientdata(client);
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schedule_work(&charger->bat_work);
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return 0;
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}
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static const struct dev_pm_ops z2_battery_pm_ops = {
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.suspend = z2_batt_suspend,
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.resume = z2_batt_resume,
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};
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#define Z2_BATTERY_PM_OPS (&z2_battery_pm_ops)
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#else
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#define Z2_BATTERY_PM_OPS (NULL)
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#endif
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static const struct i2c_device_id z2_batt_id[] = {
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{ "aer915", 0 },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, z2_batt_id);
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static struct i2c_driver z2_batt_driver = {
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.driver = {
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.name = "z2-battery",
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.pm = Z2_BATTERY_PM_OPS
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},
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.probe = z2_batt_probe,
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.remove = z2_batt_remove,
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.id_table = z2_batt_id,
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};
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module_i2c_driver(z2_batt_driver);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Peter Edwards <sweetlilmre@gmail.com>");
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MODULE_DESCRIPTION("Zipit Z2 battery driver");
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