1 files changed, 418 insertions, 0 deletions
diff --git a/drivers/mfd/max77686.c b/drivers/mfd/max77686.c
new file mode 100644
index 000000000..760d08d79
--- /dev/null
+++ b/drivers/mfd/max77686.c
@@ -0,0 +1,418 @@
+/*
+ * max77686.c - mfd core driver for the Maxim 77686/802
+ *
+ * Copyright (C) 2012 Samsung Electronics
+ * Chiwoong Byun <woong.byun@smasung.com>
+ * Jonghwa Lee <jonghwa3.lee@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.
+ *
+ * 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 <linux/export.h>
+#include <linux/slab.h>
+#include <linux/i2c.h>
+#include <linux/irq.h>
+#include <linux/interrupt.h>
+#include <linux/pm_runtime.h>
+#include <linux/module.h>
+#include <linux/mfd/core.h>
+#include <linux/mfd/max77686.h>
+#include <linux/mfd/max77686-private.h>
+#include <linux/err.h>
+#include <linux/of.h>
+
+#define I2C_ADDR_RTC	(0x0C >> 1)
+
+static const struct mfd_cell max77686_devs[] = {
+	{ .name = "max77686-pmic", },
+	{ .name = "max77686-rtc", },
+	{ .name = "max77686-clk", },
+};
+
+static const struct mfd_cell max77802_devs[] = {
+	{ .name = "max77802-pmic", },
+	{ .name = "max77802-clk", },
+	{ .name = "max77802-rtc", },
+};
+
+static bool max77802_pmic_is_accessible_reg(struct device *dev,
+					    unsigned int reg)
+{
+	return reg < MAX77802_REG_PMIC_END;
+}
+
+static bool max77802_rtc_is_accessible_reg(struct device *dev,
+					   unsigned int reg)
+{
+	return (reg >= MAX77802_RTC_INT && reg < MAX77802_RTC_END);
+}
+
+static bool max77802_is_accessible_reg(struct device *dev, unsigned int reg)
+{
+	return (max77802_pmic_is_accessible_reg(dev, reg) ||
+		max77802_rtc_is_accessible_reg(dev, reg));
+}
+
+static bool max77802_pmic_is_precious_reg(struct device *dev, unsigned int reg)
+{
+	return (reg == MAX77802_REG_INTSRC || reg == MAX77802_REG_INT1 ||
+		reg == MAX77802_REG_INT2);
+}
+
+static bool max77802_rtc_is_precious_reg(struct device *dev, unsigned int reg)
+{
+	return (reg == MAX77802_RTC_INT ||
+		reg == MAX77802_RTC_UPDATE0 ||
+		reg == MAX77802_RTC_UPDATE1);
+}
+
+static bool max77802_is_precious_reg(struct device *dev, unsigned int reg)
+{
+	return (max77802_pmic_is_precious_reg(dev, reg) ||
+		max77802_rtc_is_precious_reg(dev, reg));
+}
+
+static bool max77802_pmic_is_volatile_reg(struct device *dev, unsigned int reg)
+{
+	return (max77802_is_precious_reg(dev, reg) ||
+		reg == MAX77802_REG_STATUS1 || reg == MAX77802_REG_STATUS2 ||
+		reg == MAX77802_REG_PWRON);
+}
+
+static bool max77802_rtc_is_volatile_reg(struct device *dev, unsigned int reg)
+{
+	return (max77802_rtc_is_precious_reg(dev, reg) ||
+		reg == MAX77802_RTC_SEC ||
+		reg == MAX77802_RTC_MIN ||
+		reg == MAX77802_RTC_HOUR ||
+		reg == MAX77802_RTC_WEEKDAY ||
+		reg == MAX77802_RTC_MONTH ||
+		reg == MAX77802_RTC_YEAR ||
+		reg == MAX77802_RTC_DATE);
+}
+
+static bool max77802_is_volatile_reg(struct device *dev, unsigned int reg)
+{
+	return (max77802_pmic_is_volatile_reg(dev, reg) ||
+		max77802_rtc_is_volatile_reg(dev, reg));
+}
+
+static const struct regmap_config max77686_regmap_config = {
+	.reg_bits = 8,
+	.val_bits = 8,
+};
+
+static const struct regmap_config max77686_rtc_regmap_config = {
+	.reg_bits = 8,
+	.val_bits = 8,
+};
+
+static const struct regmap_config max77802_regmap_config = {
+	.reg_bits = 8,
+	.val_bits = 8,
+	.writeable_reg = max77802_is_accessible_reg,
+	.readable_reg = max77802_is_accessible_reg,
+	.precious_reg = max77802_is_precious_reg,
+	.volatile_reg = max77802_is_volatile_reg,
+	.name = "max77802-pmic",
+	.cache_type = REGCACHE_RBTREE,
+};
+
+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 regmap_irq_chip max77802_irq_chip = {
+	.name			= "max77802-pmic",
+	.status_base		= MAX77802_REG_INT1,
+	.mask_base		= MAX77802_REG_INT1MSK,
+	.num_regs		= 2,
+	.irqs			= max77686_irqs, /* same masks as 77686 */
+	.num_irqs		= ARRAY_SIZE(max77686_irqs),
+};
+
+static const struct regmap_irq_chip max77802_rtc_irq_chip = {
+	.name			= "max77802-rtc",
+	.status_base		= MAX77802_RTC_INT,
+	.mask_base		= MAX77802_RTC_INTM,
+	.num_regs		= 1,
+	.irqs			= max77686_rtc_irqs, /* same masks as 77686 */
+	.num_irqs		= ARRAY_SIZE(max77686_rtc_irqs),
+};
+
+static const struct of_device_id max77686_pmic_dt_match[] = {
+	{
+		.compatible = "maxim,max77686",
+		.data = (void *)TYPE_MAX77686,
+	},
+	{
+		.compatible = "maxim,max77802",
+		.data = (void *)TYPE_MAX77802,
+	},
+	{ },
+};
+
+static int max77686_i2c_probe(struct i2c_client *i2c,
+			      const struct i2c_device_id *id)
+{
+	struct max77686_dev *max77686 = NULL;
+	const struct of_device_id *match;
+	unsigned int data;
+	int ret = 0;
+	const struct regmap_config *config;
+	const struct regmap_irq_chip *irq_chip;
+	const struct regmap_irq_chip *rtc_irq_chip;
+	struct regmap **rtc_regmap;
+	const struct mfd_cell *cells;
+	int n_devs;
+
+	max77686 = devm_kzalloc(&i2c->dev,
+				sizeof(struct max77686_dev), GFP_KERNEL);
+	if (!max77686)
+		return -ENOMEM;
+
+	if (i2c->dev.of_node) {
+		match = of_match_node(max77686_pmic_dt_match, i2c->dev.of_node);
+		if (!match)
+			return -EINVAL;
+
+		max77686->type = (unsigned long)match->data;
+	} else
+		max77686->type = id->driver_data;
+
+	i2c_set_clientdata(i2c, max77686);
+	max77686->dev = &i2c->dev;
+	max77686->i2c = i2c;
+
+	max77686->irq = i2c->irq;
+
+	if (max77686->type == TYPE_MAX77686) {
+		config = &max77686_regmap_config;
+		irq_chip = &max77686_irq_chip;
+		rtc_irq_chip = &max77686_rtc_irq_chip;
+		rtc_regmap = &max77686->rtc_regmap;
+		cells =  max77686_devs;
+		n_devs = ARRAY_SIZE(max77686_devs);
+	} else {
+		config = &max77802_regmap_config;
+		irq_chip = &max77802_irq_chip;
+		rtc_irq_chip = &max77802_rtc_irq_chip;
+		rtc_regmap = &max77686->regmap;
+		cells =  max77802_devs;
+		n_devs = ARRAY_SIZE(max77802_devs);
+	}
+
+	max77686->regmap = devm_regmap_init_i2c(i2c, 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;
+	}
+
+	if (max77686->type == TYPE_MAX77686) {
+		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, 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(*rtc_regmap, max77686->irq,
+				  IRQF_TRIGGER_FALLING | IRQF_ONESHOT |
+				  IRQF_SHARED, 0, 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, cells, n_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:
+	if (max77686->type == TYPE_MAX77686)
+		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);
+
+	if (max77686->type == TYPE_MAX77686)
+		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 77686/802 multi-function core driver");
+MODULE_AUTHOR("Chiwoong Byun <woong.byun@samsung.com>");
+MODULE_LICENSE("GPL");