/* * 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/err.h> #include <linux/init.h> #include <linux/slab.h> #include <linux/i2c.h> #include <linux/interrupt.h> #include <linux/of.h> #include <linux/of_irq.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 const struct mfd_cell max8998_devs[] = { { .name = "max8998-pmic", }, { .name = "max8998-rtc", }, { .name = "max8998-battery", }, }; static const 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); #ifdef CONFIG_OF static const struct of_device_id max8998_dt_match[] = { { .compatible = "maxim,max8998", .data = (void *)TYPE_MAX8998 }, { .compatible = "national,lp3974", .data = (void *)TYPE_LP3974 }, { .compatible = "ti,lp3974", .data = (void *)TYPE_LP3974 }, {}, }; #endif /* * Only the common platform data elements for max8998 are parsed here from the * device tree. Other sub-modules of max8998 such as pmic, rtc and others have * to parse their own platform data elements from device tree. * * The max8998 platform data structure is instantiated here and the drivers for * the sub-modules need not instantiate another instance while parsing their * platform data. */ static struct max8998_platform_data *max8998_i2c_parse_dt_pdata( struct device *dev) { struct max8998_platform_data *pd; pd = devm_kzalloc(dev, sizeof(*pd), GFP_KERNEL); if (!pd) return ERR_PTR(-ENOMEM); pd->ono = irq_of_parse_and_map(dev->of_node, 1); /* * ToDo: the 'wakeup' member in the platform data is more of a linux * specfic information. Hence, there is no binding for that yet and * not parsed here. */ return pd; } static inline unsigned long max8998_i2c_get_driver_data(struct i2c_client *i2c, const struct i2c_device_id *id) { if (IS_ENABLED(CONFIG_OF) && i2c->dev.of_node) { const struct of_device_id *match; match = of_match_node(max8998_dt_match, i2c->dev.of_node); return (unsigned long)match->data; } return id->driver_data; } static int max8998_i2c_probe(struct i2c_client *i2c, const struct i2c_device_id *id) { struct max8998_platform_data *pdata = dev_get_platdata(&i2c->dev); struct max8998_dev *max8998; int ret = 0; max8998 = devm_kzalloc(&i2c->dev, sizeof(struct max8998_dev), GFP_KERNEL); if (max8998 == NULL) return -ENOMEM; if (IS_ENABLED(CONFIG_OF) && i2c->dev.of_node) { pdata = max8998_i2c_parse_dt_pdata(&i2c->dev); if (IS_ERR(pdata)) return PTR_ERR(pdata); } i2c_set_clientdata(i2c, max8998); max8998->dev = &i2c->dev; max8998->i2c = i2c; max8998->irq = i2c->irq; max8998->type = max8998_i2c_get_driver_data(i2c, id); max8998->pdata = pdata; 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); if (!max8998->rtc) { dev_err(&i2c->dev, "Failed to allocate I2C device for RTC\n"); return -ENODEV; } i2c_set_clientdata(max8998->rtc, max8998); max8998_irq_init(max8998); pm_runtime_set_active(max8998->dev); switch (max8998->type) { 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); return ret; } static const struct i2c_device_id max8998_i2c_id[] = { { "max8998", TYPE_MAX8998 }, { "lp3974", TYPE_LP3974}, { } }; static int max8998_suspend(struct device *dev) { struct i2c_client *i2c = to_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 = to_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 = to_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 = to_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", .pm = &max8998_pm, .suppress_bind_attrs = true, .of_match_table = of_match_ptr(max8998_dt_match), }, .probe = max8998_i2c_probe, .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);