/* * max8907.c - mfd driver for MAX8907 * * Copyright (C) 2010 Gyungoh Yoo <jack.yoo@maxim-ic.com> * Copyright (C) 2010-2012, NVIDIA CORPORATION. All rights reserved. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. */ #include <linux/err.h> #include <linux/i2c.h> #include <linux/init.h> #include <linux/interrupt.h> #include <linux/irq.h> #include <linux/mfd/core.h> #include <linux/mfd/max8907.h> #include <linux/module.h> #include <linux/of.h> #include <linux/of_device.h> #include <linux/regmap.h> #include <linux/slab.h> static const struct mfd_cell max8907_cells[] = { { .name = "max8907-regulator", }, { .name = "max8907-rtc", }, }; static bool max8907_gen_is_volatile_reg(struct device *dev, unsigned int reg) { switch (reg) { case MAX8907_REG_ON_OFF_IRQ1: case MAX8907_REG_ON_OFF_STAT: case MAX8907_REG_ON_OFF_IRQ2: case MAX8907_REG_CHG_IRQ1: case MAX8907_REG_CHG_IRQ2: case MAX8907_REG_CHG_STAT: return true; default: return false; } } static bool max8907_gen_is_precious_reg(struct device *dev, unsigned int reg) { switch (reg) { case MAX8907_REG_ON_OFF_IRQ1: case MAX8907_REG_ON_OFF_IRQ2: case MAX8907_REG_CHG_IRQ1: case MAX8907_REG_CHG_IRQ2: return true; default: return false; } } static bool max8907_gen_is_writeable_reg(struct device *dev, unsigned int reg) { return !max8907_gen_is_volatile_reg(dev, reg); } static const struct regmap_config max8907_regmap_gen_config = { .reg_bits = 8, .val_bits = 8, .volatile_reg = max8907_gen_is_volatile_reg, .precious_reg = max8907_gen_is_precious_reg, .writeable_reg = max8907_gen_is_writeable_reg, .max_register = MAX8907_REG_LDO20VOUT, .cache_type = REGCACHE_RBTREE, }; static bool max8907_rtc_is_volatile_reg(struct device *dev, unsigned int reg) { if (reg <= MAX8907_REG_RTC_YEAR2) return true; switch (reg) { case MAX8907_REG_RTC_STATUS: case MAX8907_REG_RTC_IRQ: return true; default: return false; } } static bool max8907_rtc_is_precious_reg(struct device *dev, unsigned int reg) { switch (reg) { case MAX8907_REG_RTC_IRQ: return true; default: return false; } } static bool max8907_rtc_is_writeable_reg(struct device *dev, unsigned int reg) { switch (reg) { case MAX8907_REG_RTC_STATUS: case MAX8907_REG_RTC_IRQ: return false; default: return true; } } static const struct regmap_config max8907_regmap_rtc_config = { .reg_bits = 8, .val_bits = 8, .volatile_reg = max8907_rtc_is_volatile_reg, .precious_reg = max8907_rtc_is_precious_reg, .writeable_reg = max8907_rtc_is_writeable_reg, .max_register = MAX8907_REG_MPL_CNTL, .cache_type = REGCACHE_RBTREE, }; static const struct regmap_irq max8907_chg_irqs[] = { { .reg_offset = 0, .mask = 1 << 0, }, { .reg_offset = 0, .mask = 1 << 1, }, { .reg_offset = 0, .mask = 1 << 2, }, { .reg_offset = 1, .mask = 1 << 0, }, { .reg_offset = 1, .mask = 1 << 1, }, { .reg_offset = 1, .mask = 1 << 2, }, { .reg_offset = 1, .mask = 1 << 3, }, { .reg_offset = 1, .mask = 1 << 4, }, { .reg_offset = 1, .mask = 1 << 5, }, { .reg_offset = 1, .mask = 1 << 6, }, { .reg_offset = 1, .mask = 1 << 7, }, }; static const struct regmap_irq_chip max8907_chg_irq_chip = { .name = "max8907 chg", .status_base = MAX8907_REG_CHG_IRQ1, .mask_base = MAX8907_REG_CHG_IRQ1_MASK, .wake_base = MAX8907_REG_CHG_IRQ1_MASK, .irq_reg_stride = MAX8907_REG_CHG_IRQ2 - MAX8907_REG_CHG_IRQ1, .num_regs = 2, .irqs = max8907_chg_irqs, .num_irqs = ARRAY_SIZE(max8907_chg_irqs), }; static const struct regmap_irq max8907_on_off_irqs[] = { { .reg_offset = 0, .mask = 1 << 0, }, { .reg_offset = 0, .mask = 1 << 1, }, { .reg_offset = 0, .mask = 1 << 2, }, { .reg_offset = 0, .mask = 1 << 3, }, { .reg_offset = 0, .mask = 1 << 4, }, { .reg_offset = 0, .mask = 1 << 5, }, { .reg_offset = 0, .mask = 1 << 6, }, { .reg_offset = 0, .mask = 1 << 7, }, { .reg_offset = 1, .mask = 1 << 0, }, { .reg_offset = 1, .mask = 1 << 1, }, }; static const struct regmap_irq_chip max8907_on_off_irq_chip = { .name = "max8907 on_off", .status_base = MAX8907_REG_ON_OFF_IRQ1, .mask_base = MAX8907_REG_ON_OFF_IRQ1_MASK, .irq_reg_stride = MAX8907_REG_ON_OFF_IRQ2 - MAX8907_REG_ON_OFF_IRQ1, .num_regs = 2, .irqs = max8907_on_off_irqs, .num_irqs = ARRAY_SIZE(max8907_on_off_irqs), }; static const struct regmap_irq max8907_rtc_irqs[] = { { .reg_offset = 0, .mask = 1 << 2, }, { .reg_offset = 0, .mask = 1 << 3, }, }; static const struct regmap_irq_chip max8907_rtc_irq_chip = { .name = "max8907 rtc", .status_base = MAX8907_REG_RTC_IRQ, .mask_base = MAX8907_REG_RTC_IRQ_MASK, .num_regs = 1, .irqs = max8907_rtc_irqs, .num_irqs = ARRAY_SIZE(max8907_rtc_irqs), }; static struct max8907 *max8907_pm_off; static void max8907_power_off(void) { regmap_update_bits(max8907_pm_off->regmap_gen, MAX8907_REG_RESET_CNFG, MAX8907_MASK_POWER_OFF, MAX8907_MASK_POWER_OFF); } static int max8907_i2c_probe(struct i2c_client *i2c, const struct i2c_device_id *id) { struct max8907 *max8907; int ret; struct max8907_platform_data *pdata = dev_get_platdata(&i2c->dev); bool pm_off = false; if (pdata) pm_off = pdata->pm_off; else if (i2c->dev.of_node) pm_off = of_property_read_bool(i2c->dev.of_node, "maxim,system-power-controller"); max8907 = devm_kzalloc(&i2c->dev, sizeof(struct max8907), GFP_KERNEL); if (!max8907) { ret = -ENOMEM; goto err_alloc_drvdata; } max8907->dev = &i2c->dev; dev_set_drvdata(max8907->dev, max8907); max8907->i2c_gen = i2c; i2c_set_clientdata(i2c, max8907); max8907->regmap_gen = devm_regmap_init_i2c(i2c, &max8907_regmap_gen_config); if (IS_ERR(max8907->regmap_gen)) { ret = PTR_ERR(max8907->regmap_gen); dev_err(&i2c->dev, "gen regmap init failed: %d\n", ret); goto err_regmap_gen; } max8907->i2c_rtc = i2c_new_dummy(i2c->adapter, MAX8907_RTC_I2C_ADDR); if (!max8907->i2c_rtc) { ret = -ENOMEM; goto err_dummy_rtc; } i2c_set_clientdata(max8907->i2c_rtc, max8907); max8907->regmap_rtc = devm_regmap_init_i2c(max8907->i2c_rtc, &max8907_regmap_rtc_config); if (IS_ERR(max8907->regmap_rtc)) { ret = PTR_ERR(max8907->regmap_rtc); dev_err(&i2c->dev, "rtc regmap init failed: %d\n", ret); goto err_regmap_rtc; } irq_set_status_flags(max8907->i2c_gen->irq, IRQ_NOAUTOEN); ret = regmap_add_irq_chip(max8907->regmap_gen, max8907->i2c_gen->irq, IRQF_ONESHOT | IRQF_SHARED, -1, &max8907_chg_irq_chip, &max8907->irqc_chg); if (ret != 0) { dev_err(&i2c->dev, "failed to add chg irq chip: %d\n", ret); goto err_irqc_chg; } ret = regmap_add_irq_chip(max8907->regmap_gen, max8907->i2c_gen->irq, IRQF_ONESHOT | IRQF_SHARED, -1, &max8907_on_off_irq_chip, &max8907->irqc_on_off); if (ret != 0) { dev_err(&i2c->dev, "failed to add on off irq chip: %d\n", ret); goto err_irqc_on_off; } ret = regmap_add_irq_chip(max8907->regmap_rtc, max8907->i2c_gen->irq, IRQF_ONESHOT | IRQF_SHARED, -1, &max8907_rtc_irq_chip, &max8907->irqc_rtc); if (ret != 0) { dev_err(&i2c->dev, "failed to add rtc irq chip: %d\n", ret); goto err_irqc_rtc; } enable_irq(max8907->i2c_gen->irq); ret = mfd_add_devices(max8907->dev, -1, max8907_cells, ARRAY_SIZE(max8907_cells), NULL, 0, NULL); if (ret != 0) { dev_err(&i2c->dev, "failed to add MFD devices %d\n", ret); goto err_add_devices; } if (pm_off && !pm_power_off) { max8907_pm_off = max8907; pm_power_off = max8907_power_off; } return 0; err_add_devices: regmap_del_irq_chip(max8907->i2c_gen->irq, max8907->irqc_rtc); err_irqc_rtc: regmap_del_irq_chip(max8907->i2c_gen->irq, max8907->irqc_on_off); err_irqc_on_off: regmap_del_irq_chip(max8907->i2c_gen->irq, max8907->irqc_chg); err_irqc_chg: err_regmap_rtc: i2c_unregister_device(max8907->i2c_rtc); err_dummy_rtc: err_regmap_gen: err_alloc_drvdata: return ret; } static int max8907_i2c_remove(struct i2c_client *i2c) { struct max8907 *max8907 = i2c_get_clientdata(i2c); mfd_remove_devices(max8907->dev); regmap_del_irq_chip(max8907->i2c_gen->irq, max8907->irqc_rtc); regmap_del_irq_chip(max8907->i2c_gen->irq, max8907->irqc_on_off); regmap_del_irq_chip(max8907->i2c_gen->irq, max8907->irqc_chg); i2c_unregister_device(max8907->i2c_rtc); return 0; } #ifdef CONFIG_OF static const struct of_device_id max8907_of_match[] = { { .compatible = "maxim,max8907" }, { }, }; MODULE_DEVICE_TABLE(of, max8907_of_match); #endif static const struct i2c_device_id max8907_i2c_id[] = { {"max8907", 0}, {} }; MODULE_DEVICE_TABLE(i2c, max8907_i2c_id); static struct i2c_driver max8907_i2c_driver = { .driver = { .name = "max8907", .of_match_table = of_match_ptr(max8907_of_match), }, .probe = max8907_i2c_probe, .remove = max8907_i2c_remove, .id_table = max8907_i2c_id, }; static int __init max8907_i2c_init(void) { int ret = -ENODEV; ret = i2c_add_driver(&max8907_i2c_driver); if (ret != 0) pr_err("Failed to register I2C driver: %d\n", ret); return ret; } subsys_initcall(max8907_i2c_init); static void __exit max8907_i2c_exit(void) { i2c_del_driver(&max8907_i2c_driver); } module_exit(max8907_i2c_exit); MODULE_DESCRIPTION("MAX8907 multi-function core driver"); MODULE_AUTHOR("Gyungoh Yoo <jack.yoo@maxim-ic.com>"); MODULE_LICENSE("GPL v2");