mfd: max77843: Add max77843 MFD driver core driver
This patch adds MAX77843 core/irq driver to support PMIC,
MUIC(Micro USB Interface Controller), Charger, Fuel Gauge,
LED and Haptic device.
Signed-off-by: Jaewon Kim <jaewon02.kim@samsung.com>
Signed-off-by: Beomho Seo <beomho.seo@samsung.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
diff --git a/drivers/mfd/max77843.c b/drivers/mfd/max77843.c
new file mode 100644
index 0000000..a354ac6
--- /dev/null
+++ b/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);