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319 lines
7.7 KiB
319 lines
7.7 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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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 <[email protected]> |
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*/ |
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#include <linux/module.h> |
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#include <linux/gpio/consumer.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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struct gpio_desc *charge_gpiod; |
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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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mutex_lock(&charger->work_lock); |
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charger->bat_status = charger->charge_gpiod ? |
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(gpiod_get_value(charger->charge_gpiod) ? |
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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 (charger->charge_gpiod) |
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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 (charger->charge_gpiod) |
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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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charger->charge_gpiod = devm_gpiod_get_optional(&client->dev, |
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NULL, GPIOD_IN); |
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if (IS_ERR(charger->charge_gpiod)) |
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return dev_err_probe(&client->dev, |
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PTR_ERR(charger->charge_gpiod), |
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"failed to get charge GPIO\n"); |
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if (charger->charge_gpiod) { |
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gpiod_set_consumer_name(charger->charge_gpiod, "BATT CHRG"); |
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irq_set_irq_type(gpiod_to_irq(charger->charge_gpiod), |
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IRQ_TYPE_EDGE_BOTH); |
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ret = request_irq(gpiod_to_irq(charger->charge_gpiod), |
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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 err; |
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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 (charger->charge_gpiod) |
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free_irq(gpiod_to_irq(charger->charge_gpiod), charger); |
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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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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 (charger->charge_gpiod) |
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free_irq(gpiod_to_irq(charger->charge_gpiod), charger); |
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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 <[email protected]>"); |
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MODULE_DESCRIPTION("Zipit Z2 battery driver");
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