diff options
Diffstat (limited to 'kernel/drivers/mfd/max77843.c')
| -rw-r--r-- | kernel/drivers/mfd/max77843.c | 243 |
1 files changed, 243 insertions, 0 deletions
diff --git a/kernel/drivers/mfd/max77843.c b/kernel/drivers/mfd/max77843.c new file mode 100644 index 000000000..a354ac677 --- /dev/null +++ b/kernel/drivers/mfd/max77843.c @@ -0,0 +1,243 @@ +/* + * MFD core driver for the Maxim MAX77843 + * + * Copyright (C) 2015 Samsung Electronics + * Author: Jaewon Kim <jaewon02.kim@samsung.com> + * Author: Beomho Seo <beomho.seo@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. + */ + +#include <linux/err.h> +#include <linux/i2c.h> +#include <linux/init.h> +#include <linux/interrupt.h> +#include <linux/module.h> +#include <linux/mfd/core.h> +#include <linux/mfd/max77843-private.h> +#include <linux/of_device.h> +#include <linux/platform_device.h> + +static const struct mfd_cell max77843_devs[] = { + { + .name = "max77843-muic", + .of_compatible = "maxim,max77843-muic", + }, { + .name = "max77843-regulator", + .of_compatible = "maxim,max77843-regulator", + }, { + .name = "max77843-charger", + .of_compatible = "maxim,max77843-charger" + }, { + .name = "max77843-fuelgauge", + .of_compatible = "maxim,max77843-fuelgauge", + }, { + .name = "max77843-haptic", + .of_compatible = "maxim,max77843-haptic", + }, +}; + +static const struct regmap_config max77843_charger_regmap_config = { + .reg_bits = 8, + .val_bits = 8, + .max_register = MAX77843_CHG_REG_END, +}; + +static const struct regmap_config max77843_regmap_config = { + .reg_bits = 8, + .val_bits = 8, + .max_register = MAX77843_SYS_REG_END, +}; + +static const struct regmap_irq max77843_irqs[] = { + /* TOPSYS interrupts */ + { .reg_offset = 0, .mask = MAX77843_SYS_IRQ_SYSUVLO_INT, }, + { .reg_offset = 0, .mask = MAX77843_SYS_IRQ_SYSOVLO_INT, }, + { .reg_offset = 0, .mask = MAX77843_SYS_IRQ_TSHDN_INT, }, + { .reg_offset = 0, .mask = MAX77843_SYS_IRQ_TM_INT, }, +}; + +static const struct regmap_irq_chip max77843_irq_chip = { + .name = "max77843", + .status_base = MAX77843_SYS_REG_SYSINTSRC, + .mask_base = MAX77843_SYS_REG_SYSINTMASK, + .mask_invert = false, + .num_regs = 1, + .irqs = max77843_irqs, + .num_irqs = ARRAY_SIZE(max77843_irqs), +}; + +/* Charger and Charger regulator use same regmap. */ +static int max77843_chg_init(struct max77843 *max77843) +{ + int ret; + + max77843->i2c_chg = i2c_new_dummy(max77843->i2c->adapter, I2C_ADDR_CHG); + if (!max77843->i2c_chg) { + dev_err(&max77843->i2c->dev, + "Cannot allocate I2C device for Charger\n"); + return PTR_ERR(max77843->i2c_chg); + } + i2c_set_clientdata(max77843->i2c_chg, max77843); + + max77843->regmap_chg = devm_regmap_init_i2c(max77843->i2c_chg, + &max77843_charger_regmap_config); + if (IS_ERR(max77843->regmap_chg)) { + ret = PTR_ERR(max77843->regmap_chg); + goto err_chg_i2c; + } + + return 0; + +err_chg_i2c: + i2c_unregister_device(max77843->i2c_chg); + + return ret; +} + +static int max77843_probe(struct i2c_client *i2c, + const struct i2c_device_id *id) +{ + struct max77843 *max77843; + unsigned int reg_data; + int ret; + + max77843 = devm_kzalloc(&i2c->dev, sizeof(*max77843), GFP_KERNEL); + if (!max77843) + return -ENOMEM; + + i2c_set_clientdata(i2c, max77843); + max77843->dev = &i2c->dev; + max77843->i2c = i2c; + max77843->irq = i2c->irq; + + max77843->regmap = devm_regmap_init_i2c(i2c, + &max77843_regmap_config); + if (IS_ERR(max77843->regmap)) { + dev_err(&i2c->dev, "Failed to allocate topsys register map\n"); + return PTR_ERR(max77843->regmap); + } + + ret = regmap_add_irq_chip(max77843->regmap, max77843->irq, + IRQF_TRIGGER_LOW | IRQF_ONESHOT | IRQF_SHARED, + 0, &max77843_irq_chip, &max77843->irq_data); + if (ret) { + dev_err(&i2c->dev, "Failed to add TOPSYS IRQ chip\n"); + return ret; + } + + ret = regmap_read(max77843->regmap, + MAX77843_SYS_REG_PMICID, ®_data); + if (ret < 0) { + dev_err(&i2c->dev, "Failed to read PMIC ID\n"); + goto err_pmic_id; + } + dev_info(&i2c->dev, "device ID: 0x%x\n", reg_data); + + ret = max77843_chg_init(max77843); + if (ret) { + dev_err(&i2c->dev, "Failed to init Charger\n"); + goto err_pmic_id; + } + + ret = regmap_update_bits(max77843->regmap, + MAX77843_SYS_REG_INTSRCMASK, + MAX77843_INTSRC_MASK_MASK, + (unsigned int)~MAX77843_INTSRC_MASK_MASK); + if (ret < 0) { + dev_err(&i2c->dev, "Failed to unmask interrupt source\n"); + goto err_pmic_id; + } + + ret = mfd_add_devices(max77843->dev, -1, max77843_devs, + ARRAY_SIZE(max77843_devs), NULL, 0, NULL); + if (ret < 0) { + dev_err(&i2c->dev, "Failed to add mfd device\n"); + goto err_pmic_id; + } + + device_init_wakeup(max77843->dev, true); + + return 0; + +err_pmic_id: + regmap_del_irq_chip(max77843->irq, max77843->irq_data); + + return ret; +} + +static int max77843_remove(struct i2c_client *i2c) +{ + struct max77843 *max77843 = i2c_get_clientdata(i2c); + + mfd_remove_devices(max77843->dev); + + regmap_del_irq_chip(max77843->irq, max77843->irq_data); + + i2c_unregister_device(max77843->i2c_chg); + + return 0; +} + +static const struct of_device_id max77843_dt_match[] = { + { .compatible = "maxim,max77843", }, + { }, +}; + +static const struct i2c_device_id max77843_id[] = { + { "max77843", }, + { }, +}; +MODULE_DEVICE_TABLE(i2c, max77843_id); + +static int __maybe_unused max77843_suspend(struct device *dev) +{ + struct i2c_client *i2c = container_of(dev, struct i2c_client, dev); + struct max77843 *max77843 = i2c_get_clientdata(i2c); + + disable_irq(max77843->irq); + if (device_may_wakeup(dev)) + enable_irq_wake(max77843->irq); + + return 0; +} + +static int __maybe_unused max77843_resume(struct device *dev) +{ + struct i2c_client *i2c = container_of(dev, struct i2c_client, dev); + struct max77843 *max77843 = i2c_get_clientdata(i2c); + + if (device_may_wakeup(dev)) + disable_irq_wake(max77843->irq); + enable_irq(max77843->irq); + + return 0; +} + +static SIMPLE_DEV_PM_OPS(max77843_pm, max77843_suspend, max77843_resume); + +static struct i2c_driver max77843_i2c_driver = { + .driver = { + .name = "max77843", + .pm = &max77843_pm, + .of_match_table = max77843_dt_match, + }, + .probe = max77843_probe, + .remove = max77843_remove, + .id_table = max77843_id, +}; + +static int __init max77843_i2c_init(void) +{ + return i2c_add_driver(&max77843_i2c_driver); +} +subsys_initcall(max77843_i2c_init); + +static void __exit max77843_i2c_exit(void) +{ + i2c_del_driver(&max77843_i2c_driver); +} +module_exit(max77843_i2c_exit); |