/* * max77686.c - mfd core driver for the Maxim 77686 * * Copyright (C) 2012 Samsung Electronics * Chiwoong Byun * Jonghwa Lee * * 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 * * This driver is based on max8997.c */ #include #include #include #include #include #include #include #include #include #include #include #include #define I2C_ADDR_RTC (0x0C >> 1) static const struct mfd_cell max77686_devs[] = { { .name = "max77686-pmic", }, { .name = "max77686-rtc", }, { .name = "max77686-clk", }, }; static struct regmap_config max77686_regmap_config = { .reg_bits = 8, .val_bits = 8, }; static struct regmap_config max77686_rtc_regmap_config = { .reg_bits = 8, .val_bits = 8, }; static const struct regmap_irq max77686_irqs[] = { /* INT1 interrupts */ { .reg_offset = 0, .mask = MAX77686_INT1_PWRONF_MSK, }, { .reg_offset = 0, .mask = MAX77686_INT1_PWRONR_MSK, }, { .reg_offset = 0, .mask = MAX77686_INT1_JIGONBF_MSK, }, { .reg_offset = 0, .mask = MAX77686_INT1_JIGONBR_MSK, }, { .reg_offset = 0, .mask = MAX77686_INT1_ACOKBF_MSK, }, { .reg_offset = 0, .mask = MAX77686_INT1_ACOKBR_MSK, }, { .reg_offset = 0, .mask = MAX77686_INT1_ONKEY1S_MSK, }, { .reg_offset = 0, .mask = MAX77686_INT1_MRSTB_MSK, }, /* INT2 interrupts */ { .reg_offset = 1, .mask = MAX77686_INT2_140C_MSK, }, { .reg_offset = 1, .mask = MAX77686_INT2_120C_MSK, }, }; static const struct regmap_irq_chip max77686_irq_chip = { .name = "max77686-pmic", .status_base = MAX77686_REG_INT1, .mask_base = MAX77686_REG_INT1MSK, .num_regs = 2, .irqs = max77686_irqs, .num_irqs = ARRAY_SIZE(max77686_irqs), }; static const struct regmap_irq max77686_rtc_irqs[] = { /* RTC interrupts */ { .reg_offset = 0, .mask = MAX77686_RTCINT_RTC60S_MSK, }, { .reg_offset = 0, .mask = MAX77686_RTCINT_RTCA1_MSK, }, { .reg_offset = 0, .mask = MAX77686_RTCINT_RTCA2_MSK, }, { .reg_offset = 0, .mask = MAX77686_RTCINT_SMPL_MSK, }, { .reg_offset = 0, .mask = MAX77686_RTCINT_RTC1S_MSK, }, { .reg_offset = 0, .mask = MAX77686_RTCINT_WTSR_MSK, }, }; static const struct regmap_irq_chip max77686_rtc_irq_chip = { .name = "max77686-rtc", .status_base = MAX77686_RTC_INT, .mask_base = MAX77686_RTC_INTM, .num_regs = 1, .irqs = max77686_rtc_irqs, .num_irqs = ARRAY_SIZE(max77686_rtc_irqs), }; static const struct of_device_id max77686_pmic_dt_match[] = { {.compatible = "maxim,max77686", .data = NULL}, {}, }; static struct max77686_platform_data *max77686_i2c_parse_dt_pdata(struct device *dev) { struct max77686_platform_data *pd; pd = devm_kzalloc(dev, sizeof(*pd), GFP_KERNEL); if (!pd) { dev_err(dev, "could not allocate memory for pdata\n"); return NULL; } dev->platform_data = pd; return pd; } static int max77686_i2c_probe(struct i2c_client *i2c, const struct i2c_device_id *id) { struct max77686_dev *max77686 = NULL; struct max77686_platform_data *pdata = dev_get_platdata(&i2c->dev); unsigned int data; int ret = 0; if (IS_ENABLED(CONFIG_OF) && i2c->dev.of_node && !pdata) pdata = max77686_i2c_parse_dt_pdata(&i2c->dev); if (!pdata) { dev_err(&i2c->dev, "No platform data found.\n"); return -EINVAL; } max77686 = devm_kzalloc(&i2c->dev, sizeof(struct max77686_dev), GFP_KERNEL); if (!max77686) return -ENOMEM; i2c_set_clientdata(i2c, max77686); max77686->dev = &i2c->dev; max77686->i2c = i2c; max77686->type = id->driver_data; max77686->wakeup = pdata->wakeup; max77686->irq = i2c->irq; max77686->regmap = devm_regmap_init_i2c(i2c, &max77686_regmap_config); if (IS_ERR(max77686->regmap)) { ret = PTR_ERR(max77686->regmap); dev_err(max77686->dev, "Failed to allocate register map: %d\n", ret); return ret; } ret = regmap_read(max77686->regmap, MAX77686_REG_DEVICE_ID, &data); if (ret < 0) { dev_err(max77686->dev, "device not found on this channel (this is not an error)\n"); return -ENODEV; } max77686->rtc = i2c_new_dummy(i2c->adapter, I2C_ADDR_RTC); if (!max77686->rtc) { dev_err(max77686->dev, "Failed to allocate I2C device for RTC\n"); return -ENODEV; } i2c_set_clientdata(max77686->rtc, max77686); max77686->rtc_regmap = devm_regmap_init_i2c(max77686->rtc, &max77686_rtc_regmap_config); if (IS_ERR(max77686->rtc_regmap)) { ret = PTR_ERR(max77686->rtc_regmap); dev_err(max77686->dev, "failed to allocate RTC regmap: %d\n", ret); goto err_unregister_i2c; } ret = regmap_add_irq_chip(max77686->regmap, max77686->irq, IRQF_TRIGGER_FALLING | IRQF_ONESHOT | IRQF_SHARED, 0, &max77686_irq_chip, &max77686->irq_data); if (ret) { dev_err(&i2c->dev, "failed to add PMIC irq chip: %d\n", ret); goto err_unregister_i2c; } ret = regmap_add_irq_chip(max77686->rtc_regmap, max77686->irq, IRQF_TRIGGER_FALLING | IRQF_ONESHOT | IRQF_SHARED, 0, &max77686_rtc_irq_chip, &max77686->rtc_irq_data); if (ret) { dev_err(&i2c->dev, "failed to add RTC irq chip: %d\n", ret); goto err_del_irqc; } ret = mfd_add_devices(max77686->dev, -1, max77686_devs, ARRAY_SIZE(max77686_devs), NULL, 0, NULL); if (ret < 0) { dev_err(&i2c->dev, "failed to add MFD devices: %d\n", ret); goto err_del_rtc_irqc; } return 0; err_del_rtc_irqc: regmap_del_irq_chip(max77686->irq, max77686->rtc_irq_data); err_del_irqc: regmap_del_irq_chip(max77686->irq, max77686->irq_data); err_unregister_i2c: i2c_unregister_device(max77686->rtc); return ret; } static int max77686_i2c_remove(struct i2c_client *i2c) { struct max77686_dev *max77686 = i2c_get_clientdata(i2c); mfd_remove_devices(max77686->dev); regmap_del_irq_chip(max77686->irq, max77686->rtc_irq_data); regmap_del_irq_chip(max77686->irq, max77686->irq_data); i2c_unregister_device(max77686->rtc); return 0; } static const struct i2c_device_id max77686_i2c_id[] = { { "max77686", TYPE_MAX77686 }, { } }; MODULE_DEVICE_TABLE(i2c, max77686_i2c_id); #ifdef CONFIG_PM_SLEEP static int max77686_suspend(struct device *dev) { struct i2c_client *i2c = container_of(dev, struct i2c_client, dev); struct max77686_dev *max77686 = i2c_get_clientdata(i2c); if (device_may_wakeup(dev)) enable_irq_wake(max77686->irq); /* * IRQ must be disabled during suspend because if it happens * while suspended it will be handled before resuming I2C. * * When device is woken up from suspend (e.g. by RTC wake alarm), * an interrupt occurs before resuming I2C bus controller. * Interrupt handler tries to read registers but this read * will fail because I2C is still suspended. */ disable_irq(max77686->irq); return 0; } static int max77686_resume(struct device *dev) { struct i2c_client *i2c = container_of(dev, struct i2c_client, dev); struct max77686_dev *max77686 = i2c_get_clientdata(i2c); if (device_may_wakeup(dev)) disable_irq_wake(max77686->irq); enable_irq(max77686->irq); return 0; } #endif /* CONFIG_PM_SLEEP */ static SIMPLE_DEV_PM_OPS(max77686_pm, max77686_suspend, max77686_resume); static struct i2c_driver max77686_i2c_driver = { .driver = { .name = "max77686", .owner = THIS_MODULE, .pm = &max77686_pm, .of_match_table = of_match_ptr(max77686_pmic_dt_match), }, .probe = max77686_i2c_probe, .remove = max77686_i2c_remove, .id_table = max77686_i2c_id, }; static int __init max77686_i2c_init(void) { return i2c_add_driver(&max77686_i2c_driver); } /* init early so consumer devices can complete system boot */ subsys_initcall(max77686_i2c_init); static void __exit max77686_i2c_exit(void) { i2c_del_driver(&max77686_i2c_driver); } module_exit(max77686_i2c_exit); MODULE_DESCRIPTION("MAXIM 77686 multi-function core driver"); MODULE_AUTHOR("Chiwoong Byun "); MODULE_LICENSE("GPL");