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- /*
- * 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");
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