| /* |
| * max8998.c - mfd core driver for the Maxim 8998 |
| * |
| * Copyright (C) 2009-2010 Samsung Electronics |
| * Kyungmin Park <kyungmin.park@samsung.com> |
| * Marek Szyprowski <m.szyprowski@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/module.h> |
| #include <linux/moduleparam.h> |
| #include <linux/init.h> |
| #include <linux/slab.h> |
| #include <linux/i2c.h> |
| #include <linux/interrupt.h> |
| #include <linux/pm_runtime.h> |
| #include <linux/mutex.h> |
| #include <linux/mfd/core.h> |
| #include <linux/mfd/max8998.h> |
| #include <linux/mfd/max8998-private.h> |
| |
| #define RTC_I2C_ADDR (0x0c >> 1) |
| |
| static struct mfd_cell max8998_devs[] = { |
| { |
| .name = "max8998-pmic", |
| }, { |
| .name = "max8998-rtc", |
| }, { |
| .name = "max8998-battery", |
| }, |
| }; |
| |
| static struct mfd_cell lp3974_devs[] = { |
| { |
| .name = "lp3974-pmic", |
| }, { |
| .name = "lp3974-rtc", |
| }, |
| }; |
| |
| int max8998_read_reg(struct i2c_client *i2c, u8 reg, u8 *dest) |
| { |
| struct max8998_dev *max8998 = i2c_get_clientdata(i2c); |
| int ret; |
| |
| mutex_lock(&max8998->iolock); |
| ret = i2c_smbus_read_byte_data(i2c, reg); |
| mutex_unlock(&max8998->iolock); |
| if (ret < 0) |
| return ret; |
| |
| ret &= 0xff; |
| *dest = ret; |
| return 0; |
| } |
| EXPORT_SYMBOL(max8998_read_reg); |
| |
| int max8998_bulk_read(struct i2c_client *i2c, u8 reg, int count, u8 *buf) |
| { |
| struct max8998_dev *max8998 = i2c_get_clientdata(i2c); |
| int ret; |
| |
| mutex_lock(&max8998->iolock); |
| ret = i2c_smbus_read_i2c_block_data(i2c, reg, count, buf); |
| mutex_unlock(&max8998->iolock); |
| if (ret < 0) |
| return ret; |
| |
| return 0; |
| } |
| EXPORT_SYMBOL(max8998_bulk_read); |
| |
| int max8998_write_reg(struct i2c_client *i2c, u8 reg, u8 value) |
| { |
| struct max8998_dev *max8998 = i2c_get_clientdata(i2c); |
| int ret; |
| |
| mutex_lock(&max8998->iolock); |
| ret = i2c_smbus_write_byte_data(i2c, reg, value); |
| mutex_unlock(&max8998->iolock); |
| return ret; |
| } |
| EXPORT_SYMBOL(max8998_write_reg); |
| |
| int max8998_bulk_write(struct i2c_client *i2c, u8 reg, int count, u8 *buf) |
| { |
| struct max8998_dev *max8998 = i2c_get_clientdata(i2c); |
| int ret; |
| |
| mutex_lock(&max8998->iolock); |
| ret = i2c_smbus_write_i2c_block_data(i2c, reg, count, buf); |
| mutex_unlock(&max8998->iolock); |
| if (ret < 0) |
| return ret; |
| |
| return 0; |
| } |
| EXPORT_SYMBOL(max8998_bulk_write); |
| |
| int max8998_update_reg(struct i2c_client *i2c, u8 reg, u8 val, u8 mask) |
| { |
| struct max8998_dev *max8998 = i2c_get_clientdata(i2c); |
| int ret; |
| |
| mutex_lock(&max8998->iolock); |
| ret = i2c_smbus_read_byte_data(i2c, reg); |
| if (ret >= 0) { |
| u8 old_val = ret & 0xff; |
| u8 new_val = (val & mask) | (old_val & (~mask)); |
| ret = i2c_smbus_write_byte_data(i2c, reg, new_val); |
| } |
| mutex_unlock(&max8998->iolock); |
| return ret; |
| } |
| EXPORT_SYMBOL(max8998_update_reg); |
| |
| static int max8998_i2c_probe(struct i2c_client *i2c, |
| const struct i2c_device_id *id) |
| { |
| struct max8998_platform_data *pdata = i2c->dev.platform_data; |
| struct max8998_dev *max8998; |
| int ret = 0; |
| |
| max8998 = kzalloc(sizeof(struct max8998_dev), GFP_KERNEL); |
| if (max8998 == NULL) |
| return -ENOMEM; |
| |
| i2c_set_clientdata(i2c, max8998); |
| max8998->dev = &i2c->dev; |
| max8998->i2c = i2c; |
| max8998->irq = i2c->irq; |
| max8998->type = id->driver_data; |
| if (pdata) { |
| max8998->ono = pdata->ono; |
| max8998->irq_base = pdata->irq_base; |
| max8998->wakeup = pdata->wakeup; |
| } |
| mutex_init(&max8998->iolock); |
| |
| max8998->rtc = i2c_new_dummy(i2c->adapter, RTC_I2C_ADDR); |
| i2c_set_clientdata(max8998->rtc, max8998); |
| |
| max8998_irq_init(max8998); |
| |
| pm_runtime_set_active(max8998->dev); |
| |
| switch (id->driver_data) { |
| case TYPE_LP3974: |
| ret = mfd_add_devices(max8998->dev, -1, |
| lp3974_devs, ARRAY_SIZE(lp3974_devs), |
| NULL, 0, NULL); |
| break; |
| case TYPE_MAX8998: |
| ret = mfd_add_devices(max8998->dev, -1, |
| max8998_devs, ARRAY_SIZE(max8998_devs), |
| NULL, 0, NULL); |
| break; |
| default: |
| ret = -EINVAL; |
| } |
| |
| if (ret < 0) |
| goto err; |
| |
| device_init_wakeup(max8998->dev, max8998->wakeup); |
| |
| return ret; |
| |
| err: |
| mfd_remove_devices(max8998->dev); |
| max8998_irq_exit(max8998); |
| i2c_unregister_device(max8998->rtc); |
| kfree(max8998); |
| return ret; |
| } |
| |
| static int max8998_i2c_remove(struct i2c_client *i2c) |
| { |
| struct max8998_dev *max8998 = i2c_get_clientdata(i2c); |
| |
| mfd_remove_devices(max8998->dev); |
| max8998_irq_exit(max8998); |
| i2c_unregister_device(max8998->rtc); |
| kfree(max8998); |
| |
| return 0; |
| } |
| |
| static const struct i2c_device_id max8998_i2c_id[] = { |
| { "max8998", TYPE_MAX8998 }, |
| { "lp3974", TYPE_LP3974}, |
| { } |
| }; |
| MODULE_DEVICE_TABLE(i2c, max8998_i2c_id); |
| |
| static int max8998_suspend(struct device *dev) |
| { |
| struct i2c_client *i2c = container_of(dev, struct i2c_client, dev); |
| struct max8998_dev *max8998 = i2c_get_clientdata(i2c); |
| |
| if (device_may_wakeup(dev)) |
| irq_set_irq_wake(max8998->irq, 1); |
| return 0; |
| } |
| |
| static int max8998_resume(struct device *dev) |
| { |
| struct i2c_client *i2c = container_of(dev, struct i2c_client, dev); |
| struct max8998_dev *max8998 = i2c_get_clientdata(i2c); |
| |
| if (device_may_wakeup(dev)) |
| irq_set_irq_wake(max8998->irq, 0); |
| /* |
| * In LP3974, if IRQ registers are not "read & clear" |
| * when it's set during sleep, the interrupt becomes |
| * disabled. |
| */ |
| return max8998_irq_resume(i2c_get_clientdata(i2c)); |
| } |
| |
| struct max8998_reg_dump { |
| u8 addr; |
| u8 val; |
| }; |
| #define SAVE_ITEM(x) { .addr = (x), .val = 0x0, } |
| static struct max8998_reg_dump max8998_dump[] = { |
| SAVE_ITEM(MAX8998_REG_IRQM1), |
| SAVE_ITEM(MAX8998_REG_IRQM2), |
| SAVE_ITEM(MAX8998_REG_IRQM3), |
| SAVE_ITEM(MAX8998_REG_IRQM4), |
| SAVE_ITEM(MAX8998_REG_STATUSM1), |
| SAVE_ITEM(MAX8998_REG_STATUSM2), |
| SAVE_ITEM(MAX8998_REG_CHGR1), |
| SAVE_ITEM(MAX8998_REG_CHGR2), |
| SAVE_ITEM(MAX8998_REG_LDO_ACTIVE_DISCHARGE1), |
| SAVE_ITEM(MAX8998_REG_LDO_ACTIVE_DISCHARGE1), |
| SAVE_ITEM(MAX8998_REG_BUCK_ACTIVE_DISCHARGE3), |
| SAVE_ITEM(MAX8998_REG_ONOFF1), |
| SAVE_ITEM(MAX8998_REG_ONOFF2), |
| SAVE_ITEM(MAX8998_REG_ONOFF3), |
| SAVE_ITEM(MAX8998_REG_ONOFF4), |
| SAVE_ITEM(MAX8998_REG_BUCK1_VOLTAGE1), |
| SAVE_ITEM(MAX8998_REG_BUCK1_VOLTAGE2), |
| SAVE_ITEM(MAX8998_REG_BUCK1_VOLTAGE3), |
| SAVE_ITEM(MAX8998_REG_BUCK1_VOLTAGE4), |
| SAVE_ITEM(MAX8998_REG_BUCK2_VOLTAGE1), |
| SAVE_ITEM(MAX8998_REG_BUCK2_VOLTAGE2), |
| SAVE_ITEM(MAX8998_REG_LDO2_LDO3), |
| SAVE_ITEM(MAX8998_REG_LDO4), |
| SAVE_ITEM(MAX8998_REG_LDO5), |
| SAVE_ITEM(MAX8998_REG_LDO6), |
| SAVE_ITEM(MAX8998_REG_LDO7), |
| SAVE_ITEM(MAX8998_REG_LDO8_LDO9), |
| SAVE_ITEM(MAX8998_REG_LDO10_LDO11), |
| SAVE_ITEM(MAX8998_REG_LDO12), |
| SAVE_ITEM(MAX8998_REG_LDO13), |
| SAVE_ITEM(MAX8998_REG_LDO14), |
| SAVE_ITEM(MAX8998_REG_LDO15), |
| SAVE_ITEM(MAX8998_REG_LDO16), |
| SAVE_ITEM(MAX8998_REG_LDO17), |
| SAVE_ITEM(MAX8998_REG_BKCHR), |
| SAVE_ITEM(MAX8998_REG_LBCNFG1), |
| SAVE_ITEM(MAX8998_REG_LBCNFG2), |
| }; |
| /* Save registers before hibernation */ |
| static int max8998_freeze(struct device *dev) |
| { |
| struct i2c_client *i2c = container_of(dev, struct i2c_client, dev); |
| int i; |
| |
| for (i = 0; i < ARRAY_SIZE(max8998_dump); i++) |
| max8998_read_reg(i2c, max8998_dump[i].addr, |
| &max8998_dump[i].val); |
| |
| return 0; |
| } |
| |
| /* Restore registers after hibernation */ |
| static int max8998_restore(struct device *dev) |
| { |
| struct i2c_client *i2c = container_of(dev, struct i2c_client, dev); |
| int i; |
| |
| for (i = 0; i < ARRAY_SIZE(max8998_dump); i++) |
| max8998_write_reg(i2c, max8998_dump[i].addr, |
| max8998_dump[i].val); |
| |
| return 0; |
| } |
| |
| static const struct dev_pm_ops max8998_pm = { |
| .suspend = max8998_suspend, |
| .resume = max8998_resume, |
| .freeze = max8998_freeze, |
| .restore = max8998_restore, |
| }; |
| |
| static struct i2c_driver max8998_i2c_driver = { |
| .driver = { |
| .name = "max8998", |
| .owner = THIS_MODULE, |
| .pm = &max8998_pm, |
| }, |
| .probe = max8998_i2c_probe, |
| .remove = max8998_i2c_remove, |
| .id_table = max8998_i2c_id, |
| }; |
| |
| static int __init max8998_i2c_init(void) |
| { |
| return i2c_add_driver(&max8998_i2c_driver); |
| } |
| /* init early so consumer devices can complete system boot */ |
| subsys_initcall(max8998_i2c_init); |
| |
| static void __exit max8998_i2c_exit(void) |
| { |
| i2c_del_driver(&max8998_i2c_driver); |
| } |
| module_exit(max8998_i2c_exit); |
| |
| MODULE_DESCRIPTION("MAXIM 8998 multi-function core driver"); |
| MODULE_AUTHOR("Kyungmin Park <kyungmin.park@samsung.com>"); |
| MODULE_LICENSE("GPL"); |
