diff options
Diffstat (limited to '')
| -rw-r--r-- | drivers/mfd/max8998.c | 360 |
1 files changed, 360 insertions, 0 deletions
diff --git a/drivers/mfd/max8998.c b/drivers/mfd/max8998.c new file mode 100644 index 000000000..0eb15e611 --- /dev/null +++ b/drivers/mfd/max8998.c @@ -0,0 +1,360 @@ +// SPDX-License-Identifier: GPL-2.0+ +// +// 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> + +#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_device.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 (i2c->dev.of_node) + return (unsigned long)of_device_get_match_data(&i2c->dev); + + 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_device(i2c->adapter, RTC_I2C_ADDR); + if (IS_ERR(max8998->rtc)) { + dev_err(&i2c->dev, "Failed to allocate I2C device for RTC\n"); + return PTR_ERR(max8998->rtc); + } + 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); |