mfd: rt5033: Add Richtek RT5033 driver core.

This patch adds a new driver for Richtek RT5033 driver.
RT5033 is a Multifunction device which includes battery charger, fuel gauge,
flash LED current source, LDO and synchronous Buck converter. It is interfaced
to host controller using I2C interface.

Signed-off-by: Beomho Seo <beomho.seo@samsung.com>
Acked-by: Chanwoo Choi <cw00.choi@samsung.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>

3 files changed, 155 insertions, 0 deletions

diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index 2e6b7311fabc..9cd2af660cc5 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -623,6 +623,18 @@ config MFD_RTSX_PCI
           types of memory cards, such as Memory Stick, Memory Stick Pro,
           Secure Digital and MultiMediaCard.
 
+config MFD_RT5033
+        tristate "Richtek RT5033 Power Management IC"
+        depends on I2C=y
+        select MFD_CORE
+        select REGMAP_I2C
+        help
+          This driver provides for the Richtek RT5033 Power Management IC,
+          which includes the I2C driver and the Core APIs. This driver provides
+          common support for accessing the device. The device supports multiple
+          sub-devices like charger, fuel gauge, flash LED, current source,
+          LDO and Buck.
+
 config MFD_RTSX_USB
         tristate "Realtek USB card reader"
         depends on USB
diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
index 53467e211381..4059c247c59a 100644
--- a/drivers/mfd/Makefile
+++ b/drivers/mfd/Makefile
@@ -176,6 +176,7 @@ obj-$(CONFIG_MFD_IPAQ_MICRO)	+= ipaq-micro.o
 obj-$(CONFIG_MFD_MENF21BMC)     += menf21bmc.o
 obj-$(CONFIG_MFD_HI6421_PMIC)   += hi6421-pmic-core.o
 obj-$(CONFIG_MFD_DLN2)          += dln2.o
+obj-$(CONFIG_MFD_RT5033)        += rt5033.o
 
 intel-soc-pmic-objs             := intel_soc_pmic_core.o intel_soc_pmic_crc.o
 obj-$(CONFIG_INTEL_SOC_PMIC)    += intel-soc-pmic.o
diff --git a/drivers/mfd/rt5033.c b/drivers/mfd/rt5033.c
new file mode 100644
index 000000000000..db395a6c52bc
--- /dev/null
+++ b/drivers/mfd/rt5033.c
@@ -0,0 +1,142 @@
+/*
+ * MFD core driver for the Richtek RT5033.
+ *
+ * RT5033 comprises multiple sub-devices switcing charger, fuel gauge,
+ * flash LED, current source, LDO and BUCK regulators.
+ *
+ * Copyright (C) 2014 Samsung Electronics, Co., Ltd.
+ * 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 version 2 as
+ * published bythe Free Software Foundation.
+ */
+
+#include <linux/err.h>
+#include <linux/module.h>
+#include <linux/interrupt.h>
+#include <linux/of_device.h>
+#include <linux/mfd/core.h>
+#include <linux/mfd/rt5033.h>
+#include <linux/mfd/rt5033-private.h>
+
+static const struct regmap_irq rt5033_irqs[] = {
+        { .mask = RT5033_PMIC_IRQ_BUCKOCP, },
+        { .mask = RT5033_PMIC_IRQ_BUCKLV, },
+        { .mask = RT5033_PMIC_IRQ_SAFELDOLV, },
+        { .mask = RT5033_PMIC_IRQ_LDOLV, },
+        { .mask = RT5033_PMIC_IRQ_OT, },
+        { .mask = RT5033_PMIC_IRQ_VDDA_UV, },
+};
+
+static const struct regmap_irq_chip rt5033_irq_chip = {
+        .name           = "rt5033",
+        .status_base    = RT5033_REG_PMIC_IRQ_STAT,
+        .mask_base      = RT5033_REG_PMIC_IRQ_CTRL,
+        .mask_invert    = true,
+        .num_regs       = 1,
+        .irqs           = rt5033_irqs,
+        .num_irqs       = ARRAY_SIZE(rt5033_irqs),
+};
+
+static const struct mfd_cell rt5033_devs[] = {
+        { .name = "rt5033-regulator", },
+        {
+                .name = "rt5033-charger",
+                .of_compatible = "richtek,rt5033-charger",
+        }, {
+                .name = "rt5033-battery",
+                .of_compatible = "richtek,rt5033-battery",
+        },
+};
+
+static const struct regmap_config rt5033_regmap_config = {
+        .reg_bits       = 8,
+        .val_bits       = 8,
+        .max_register   = RT5033_REG_END,
+};
+
+static int rt5033_i2c_probe(struct i2c_client *i2c,
+                                const struct i2c_device_id *id)
+{
+        struct rt5033_dev *rt5033;
+        unsigned int dev_id;
+        int ret;
+
+        rt5033 = devm_kzalloc(&i2c->dev, sizeof(*rt5033), GFP_KERNEL);
+        if (!rt5033)
+                return -ENOMEM;
+
+        i2c_set_clientdata(i2c, rt5033);
+        rt5033->dev = &i2c->dev;
+        rt5033->irq = i2c->irq;
+        rt5033->wakeup = true;
+
+        rt5033->regmap = devm_regmap_init_i2c(i2c, &rt5033_regmap_config);
+        if (IS_ERR(rt5033->regmap)) {
+                dev_err(&i2c->dev, "Failed to allocate register map.\n");
+                return PTR_ERR(rt5033->regmap);
+        }
+
+        ret = regmap_read(rt5033->regmap, RT5033_REG_DEVICE_ID, &dev_id);
+        if (ret) {
+                dev_err(&i2c->dev, "Device not found\n");
+                return -ENODEV;
+        }
+        dev_info(&i2c->dev, "Device found Device ID: %04x\n", dev_id);
+
+        ret = regmap_add_irq_chip(rt5033->regmap, rt5033->irq,
+                        IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
+                        0, &rt5033_irq_chip, &rt5033->irq_data);
+        if (ret) {
+                dev_err(&i2c->dev, "Failed to request IRQ %d: %d\n",
+                                                        rt5033->irq, ret);
+                return ret;
+        }
+
+        ret = mfd_add_devices(rt5033->dev, -1, rt5033_devs,
+                        ARRAY_SIZE(rt5033_devs), NULL, 0,
+                        regmap_irq_get_domain(rt5033->irq_data));
+        if (ret < 0) {
+                dev_err(&i2c->dev, "Failed to add RT5033 child devices.\n");
+                return ret;
+        }
+
+        device_init_wakeup(rt5033->dev, rt5033->wakeup);
+
+        return 0;
+}
+
+static int rt5033_i2c_remove(struct i2c_client *i2c)
+{
+        mfd_remove_devices(&i2c->dev);
+
+        return 0;
+}
+
+static const struct i2c_device_id rt5033_i2c_id[] = {
+        { "rt5033", },
+        { }
+};
+MODULE_DEVICE_TABLE(i2c, rt5033_i2c_id);
+
+static const struct of_device_id rt5033_dt_match[] = {
+        { .compatible = "richtek,rt5033", },
+        { }
+};
+
+static struct i2c_driver rt5033_driver = {
+        .driver = {
+                .name = "rt5033",
+                .of_match_table = of_match_ptr(rt5033_dt_match),
+        },
+        .probe = rt5033_i2c_probe,
+        .remove = rt5033_i2c_remove,
+        .id_table = rt5033_i2c_id,
+};
+module_i2c_driver(rt5033_driver);
+
+MODULE_ALIAS("i2c:rt5033");
+MODULE_DESCRIPTION("Richtek RT5033 multi-function core driver");
+MODULE_AUTHOR("Beomho Seo <beomho.seo@samsung.com>");
+MODULE_LICENSE("GPL");