diff options
Diffstat (limited to 'drivers/power/supply/max8997_charger.c')
| -rw-r--r-- | drivers/power/supply/max8997_charger.c | 211 |
1 files changed, 211 insertions, 0 deletions
diff --git a/drivers/power/supply/max8997_charger.c b/drivers/power/supply/max8997_charger.c new file mode 100644 index 000000000000..0b2eab571528 --- /dev/null +++ b/drivers/power/supply/max8997_charger.c @@ -0,0 +1,211 @@ +/* + * max8997_charger.c - Power supply consumer driver for the Maxim 8997/8966 + * + * Copyright (C) 2011 Samsung Electronics + * MyungJoo Ham <myungjoo.ham@samsung.com> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ + +#include <linux/err.h> +#include <linux/module.h> +#include <linux/slab.h> +#include <linux/platform_device.h> +#include <linux/power_supply.h> +#include <linux/mfd/max8997.h> +#include <linux/mfd/max8997-private.h> + +struct charger_data { + struct device *dev; + struct max8997_dev *iodev; + struct power_supply *battery; +}; + +static enum power_supply_property max8997_battery_props[] = { + POWER_SUPPLY_PROP_STATUS, /* "FULL" or "NOT FULL" only. */ + POWER_SUPPLY_PROP_PRESENT, /* the presence of battery */ + POWER_SUPPLY_PROP_ONLINE, /* charger is active or not */ +}; + +/* Note that the charger control is done by a current regulator "CHARGER" */ +static int max8997_battery_get_property(struct power_supply *psy, + enum power_supply_property psp, + union power_supply_propval *val) +{ + struct charger_data *charger = power_supply_get_drvdata(psy); + struct i2c_client *i2c = charger->iodev->i2c; + int ret; + u8 reg; + + switch (psp) { + case POWER_SUPPLY_PROP_STATUS: + val->intval = 0; + ret = max8997_read_reg(i2c, MAX8997_REG_STATUS4, ®); + if (ret) + return ret; + if ((reg & (1 << 0)) == 0x1) + val->intval = POWER_SUPPLY_STATUS_FULL; + + break; + case POWER_SUPPLY_PROP_PRESENT: + val->intval = 0; + ret = max8997_read_reg(i2c, MAX8997_REG_STATUS4, ®); + if (ret) + return ret; + if ((reg & (1 << 2)) == 0x0) + val->intval = 1; + + break; + case POWER_SUPPLY_PROP_ONLINE: + val->intval = 0; + ret = max8997_read_reg(i2c, MAX8997_REG_STATUS4, ®); + if (ret) + return ret; + /* DCINOK */ + if (reg & (1 << 1)) + val->intval = 1; + + break; + default: + return -EINVAL; + } + + return 0; +} + +static const struct power_supply_desc max8997_battery_desc = { + .name = "max8997_pmic", + .type = POWER_SUPPLY_TYPE_BATTERY, + .get_property = max8997_battery_get_property, + .properties = max8997_battery_props, + .num_properties = ARRAY_SIZE(max8997_battery_props), +}; + +static int max8997_battery_probe(struct platform_device *pdev) +{ + int ret = 0; + struct charger_data *charger; + struct max8997_dev *iodev = dev_get_drvdata(pdev->dev.parent); + struct max8997_platform_data *pdata = dev_get_platdata(iodev->dev); + struct power_supply_config psy_cfg = {}; + + if (!pdata) + return -EINVAL; + + if (pdata->eoc_mA) { + int val = (pdata->eoc_mA - 50) / 10; + if (val < 0) + val = 0; + if (val > 0xf) + val = 0xf; + + ret = max8997_update_reg(iodev->i2c, + MAX8997_REG_MBCCTRL5, val, 0xf); + if (ret < 0) { + dev_err(&pdev->dev, "Cannot use i2c bus.\n"); + return ret; + } + } + + switch (pdata->timeout) { + case 5: + ret = max8997_update_reg(iodev->i2c, MAX8997_REG_MBCCTRL1, + 0x2 << 4, 0x7 << 4); + break; + case 6: + ret = max8997_update_reg(iodev->i2c, MAX8997_REG_MBCCTRL1, + 0x3 << 4, 0x7 << 4); + break; + case 7: + ret = max8997_update_reg(iodev->i2c, MAX8997_REG_MBCCTRL1, + 0x4 << 4, 0x7 << 4); + break; + case 0: + ret = max8997_update_reg(iodev->i2c, MAX8997_REG_MBCCTRL1, + 0x7 << 4, 0x7 << 4); + break; + default: + dev_err(&pdev->dev, "incorrect timeout value (%d)\n", + pdata->timeout); + return -EINVAL; + } + if (ret < 0) { + dev_err(&pdev->dev, "Cannot use i2c bus.\n"); + return ret; + } + + charger = devm_kzalloc(&pdev->dev, sizeof(struct charger_data), + GFP_KERNEL); + if (charger == NULL) { + dev_err(&pdev->dev, "Cannot allocate memory.\n"); + return -ENOMEM; + } + + platform_set_drvdata(pdev, charger); + + + charger->dev = &pdev->dev; + charger->iodev = iodev; + + psy_cfg.drv_data = charger; + + charger->battery = power_supply_register(&pdev->dev, + &max8997_battery_desc, + &psy_cfg); + if (IS_ERR(charger->battery)) { + dev_err(&pdev->dev, "failed: power supply register\n"); + return PTR_ERR(charger->battery); + } + + return 0; +} + +static int max8997_battery_remove(struct platform_device *pdev) +{ + struct charger_data *charger = platform_get_drvdata(pdev); + + power_supply_unregister(charger->battery); + return 0; +} + +static const struct platform_device_id max8997_battery_id[] = { + { "max8997-battery", 0 }, + { } +}; + +static struct platform_driver max8997_battery_driver = { + .driver = { + .name = "max8997-battery", + }, + .probe = max8997_battery_probe, + .remove = max8997_battery_remove, + .id_table = max8997_battery_id, +}; + +static int __init max8997_battery_init(void) +{ + return platform_driver_register(&max8997_battery_driver); +} +subsys_initcall(max8997_battery_init); + +static void __exit max8997_battery_cleanup(void) +{ + platform_driver_unregister(&max8997_battery_driver); +} +module_exit(max8997_battery_cleanup); + +MODULE_DESCRIPTION("MAXIM 8997/8966 battery control driver"); +MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>"); +MODULE_LICENSE("GPL"); |