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>

4 files changed, 712 insertions, 0 deletions

diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index c602f7440e00..f8ef77d9ac1f 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -456,6 +456,20 @@ config MFD_MAX77693
           additional drivers must be enabled in order to use the functionality
           of the device.
 
+config MFD_MAX77843
+        bool "Maxim Semiconductor MAX77843 PMIC Support"
+        depends on I2C=y
+        select MFD_CORE
+        select REGMAP_I2C
+        select REGMAP_IRQ
+        help
+          Say yes here to add support for Maxim Semiconductor MAX77843.
+          This is companion Power Management IC with LEDs, Haptic, Charger,
+          Fuel Gauge, MUIC(Micro USB Interface Controller) controls on chip.
+          This driver provides common support for accessing the device;
+          additional drivers must be enabled in order to use the functionality
+          of the device.
+
 config MFD_MAX8907
         tristate "Maxim Semiconductor MAX8907 PMIC Support"
         select MFD_CORE
diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
index 26303f712afb..234998d77d43 100644
--- a/drivers/mfd/Makefile
+++ b/drivers/mfd/Makefile
@@ -117,6 +117,7 @@ obj-$(CONFIG_MFD_DA9150)	+= da9150-core.o
 obj-$(CONFIG_MFD_MAX14577)      += max14577.o
 obj-$(CONFIG_MFD_MAX77686)      += max77686.o
 obj-$(CONFIG_MFD_MAX77693)      += max77693.o
+obj-$(CONFIG_MFD_MAX77843)      += max77843.o
 obj-$(CONFIG_MFD_MAX8907)       += max8907.o
 max8925-objs                    := max8925-core.o max8925-i2c.o
 obj-$(CONFIG_MFD_MAX8925)       += max8925.o
diff --git a/drivers/mfd/max77843.c b/drivers/mfd/max77843.c
new file mode 100644
index 000000000000..a354ac677ec7
--- /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, &reg_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(max778