mfd: Add Ricoh RN5T618 PMIC core driver

Ricoh RN5T618 is a power management IC which integrates 3 step-down
DCDC converters, 7 low-dropout regulators, a Li-ion battery charger,
fuel gauge, ADC, GPIOs and a watchdog timer.

This commit adds a MFD core driver to support the I2C communication
with the device.

Signed-off-by: Beniamino Galvani <b.galvani@gmail.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>

4 files changed, 374 insertions, 0 deletions

diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index fc419da8d722..82f70dcab136 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -597,6 +597,17 @@ config MFD_RC5T583
 	  Additional drivers must be enabled in order to use the
 	  different functionality of the device.
 
+config MFD_RN5T618
+	tristate "Ricoh RN5T5618 PMIC"
+	depends on I2C
+	select MFD_CORE
+	select REGMAP_I2C
+	help
+	  Say yes here to add support for the Ricoh RN5T618 PMIC. 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_SEC_CORE
 	bool "SAMSUNG Electronics PMIC Series Support"
 	depends on I2C=y
diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
index d58068aa8aa9..aa5a73a5ba47 100644
--- a/drivers/mfd/Makefile
+++ b/drivers/mfd/Makefile
@@ -160,6 +160,7 @@ obj-$(CONFIG_MFD_INTEL_MSIC)	+= intel_msic.o
 obj-$(CONFIG_MFD_PALMAS)	+= palmas.o
 obj-$(CONFIG_MFD_VIPERBOARD)    += viperboard.o
 obj-$(CONFIG_MFD_RC5T583)	+= rc5t583.o rc5t583-irq.o
+obj-$(CONFIG_MFD_RN5T618)	+= rn5t618.o
 obj-$(CONFIG_MFD_SEC_CORE)	+= sec-core.o sec-irq.o
 obj-$(CONFIG_MFD_SYSCON)	+= syscon.o
 obj-$(CONFIG_MFD_LM3533)	+= lm3533-core.o lm3533-ctrlbank.o
diff --git a/drivers/mfd/rn5t618.c b/drivers/mfd/rn5t618.c
new file mode 100644
index 000000000000..666857192dbe
--- /dev/null
+++ b/drivers/mfd/rn5t618.c
@@ -0,0 +1,134 @@
+/*
+ * MFD core driver for Ricoh RN5T618 PMIC
+ *
+ * Copyright (C) 2014 Beniamino Galvani <b.galvani@gmail.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 by the Free Software Foundation.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/i2c.h>
+#include <linux/mfd/core.h>
+#include <linux/mfd/rn5t618.h>
+#include <linux/module.h>
+#include <linux/regmap.h>
+
+static const struct mfd_cell rn5t618_cells[] = {
+	{ .name = "rn5t618-regulator" },
+	{ .name = "rn5t618-wdt" },
+};
+
+static bool rn5t618_volatile_reg(struct device *dev, unsigned int reg)
+{
+	switch (reg) {
+	case RN5T618_WATCHDOGCNT:
+	case RN5T618_DCIRQ:
+	case RN5T618_ILIMDATAH ... RN5T618_AIN0DATAL:
+	case RN5T618_IR_ADC1 ... RN5T618_IR_ADC3:
+	case RN5T618_IR_GPR:
+	case RN5T618_IR_GPF:
+	case RN5T618_MON_IOIN:
+	case RN5T618_INTMON:
+		return true;
+	default:
+		return false;
+	}
+}
+
+static const struct regmap_config rn5t618_regmap_config = {
+	.reg_bits	= 8,
+	.val_bits	= 8,
+	.volatile_reg	= rn5t618_volatile_reg,
+	.max_register	= RN5T618_MAX_REG,
+	.cache_type	= REGCACHE_RBTREE,
+};
+
+static struct rn5t618 *rn5t618_pm_power_off;
+
+static void rn5t618_power_off(void)
+{
+	/* disable automatic repower-on */
+	regmap_update_bits(rn5t618_pm_power_off->regmap, RN5T618_REPCNT,
+			   RN5T618_REPCNT_REPWRON, 0);
+	/* start power-off sequence */
+	regmap_update_bits(rn5t618_pm_power_off->regmap, RN5T618_SLPCNT,
+			   RN5T618_SLPCNT_SWPWROFF, RN5T618_SLPCNT_SWPWROFF);
+}
+
+static int rn5t618_i2c_probe(struct i2c_client *i2c,
+			     const struct i2c_device_id *id)
+{
+	struct rn5t618 *priv;
+	int ret;
+
+	priv = devm_kzalloc(&i2c->dev, sizeof(*priv), GFP_KERNEL);
+	if (!priv)
+		return -ENOMEM;
+
+	i2c_set_clientdata(i2c, priv);
+
+	priv->regmap = devm_regmap_init_i2c(i2c, &rn5t618_regmap_config);
+	if (IS_ERR(priv->regmap)) {
+		ret = PTR_ERR(priv->regmap);
+		dev_err(&i2c->dev, "regmap init failed: %d\n", ret);
+		return ret;
+	}
+
+	ret = mfd_add_devices(&i2c->dev, -1, rn5t618_cells,
+			      ARRAY_SIZE(rn5t618_cells), NULL, 0, NULL);
+	if (ret) {
+		dev_err(&i2c->dev, "failed to add sub-devices: %d\n", ret);
+		return ret;
+	}
+
+	if (!pm_power_off) {
+		rn5t618_pm_power_off = priv;
+		pm_power_off = rn5t618_power_off;
+	}
+
+	return 0;
+}
+
+static int rn5t618_i2c_remove(struct i2c_client *i2c)
+{
+	struct rn5t618 *priv = i2c_get_clientdata(i2c);
+
+	if (priv == rn5t618_pm_power_off) {
+		rn5t618_pm_power_off = NULL;
+		pm_power_off = NULL;
+	}
+
+	mfd_remove_devices(&i2c->dev);
+	return 0;
+}
+
+static const struct of_device_id rn5t618_of_match[] = {
+	{ .compatible = "ricoh,rn5t618" },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, rn5t618_of_match);
+
+static const struct i2c_device_id rn5t618_i2c_id[] = {
+	{ }
+};
+MODULE_DEVICE_TABLE(i2c, rn5t618_i2c_id);
+
+static struct i2c_driver rn5t618_i2c_driver = {
+	.driver = {
+		.name = "rn5t618",
+		.of_match_table = of_match_ptr(rn5t618_of_match),
+	},
+	.probe = rn5t618_i2c_probe,
+	.remove = rn5t618_i2c_remove,
+	.id_table = rn5t618_i2c_id,
+};
+
+module_i2c_driver(rn5t618_i2c_driver);
+
+MODULE_AUTHOR("Beniamino Galvani <b.galvani@gmail.com>");
+MODULE_DESCRIPTION("Ricoh RN5T618 MFD driver");
+MODULE_LICENSE("GPL v2");
diff --git a/include/linux/mfd/rn5t618.h b/include/linux/mfd/rn5t618.h
new file mode 100644
index 000000000000..c72d5344f3b3
--- /dev/null
+++ b/include/linux/mfd/rn5t618.h
@@ -0,0 +1,228 @@
+/*
+ * MFD core driver for Ricoh RN5T618 PMIC
+ *
+ * Copyright (C) 2014 Beniamino Galvani <b.galvani@gmail.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 by the Free Software Foundation.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef __LINUX_MFD_RN5T618_H
+#define __LINUX_MFD_RN5T618_H
+
+#include <linux/regmap.h>
+
+#define RN5T618_LSIVER			0x00
+#define RN5T618_OTPVER			0x01
+#define RN5T618_IODAC			0x02
+#define RN5T618_VINDAC			0x03
+#define RN5T618_CPUCNT			0x06
+#define RN5T618_PSWR			0x07
+#define RN5T618_PONHIS			0x09
+#define RN5T618_POFFHIS			0x0a
+#define RN5T618_WATCHDOG		0x0b
+#define RN5T618_WATCHDOGCNT		0x0c
+#define RN5T618_PWRFUNC			0x0d
+#define RN5T618_SLPCNT			0x0e
+#define RN5T618_REPCNT			0x0f
+#define RN5T618_PWRONTIMSET		0x10
+#define RN5T618_NOETIMSETCNT		0x11
+#define RN5T618_PWRIREN			0x12
+#define RN5T618_PWRIRQ			0x13
+#define RN5T618_PWRMON			0x14
+#define RN5T618_PWRIRSEL		0x15
+#define RN5T618_DC1_SLOT		0x16
+#define RN5T618_DC2_SLOT		0x17
+#define RN5T618_DC3_SLOT		0x18
+#define RN5T618_LDO1_SLOT		0x1b
+#define RN5T618_LDO2_SLOT		0x1c
+#define RN5T618_LDO3_SLOT		0x1d
+#define RN5T618_LDO4_SLOT		0x1e
+#define RN5T618_LDO5_SLOT		0x1f
+#define RN5T618_PSO0_SLOT		0x25
+#define RN5T618_PSO1_SLOT		0x26
+#define RN5T618_PSO2_SLOT		0x27
+#define RN5T618_PSO3_SLOT		0x28
+#define RN5T618_LDORTC1_SLOT		0x2a
+#define RN5T618_DC1CTL			0x2c
+#define RN5T618_DC1CTL2			0x2d
+#define RN5T618_DC2CTL			0x2e
+#define RN5T618_DC2CTL2			0x2f
+#define RN5T618_DC3CTL			0x30
+#define RN5T618_DC3CTL2			0x31
+#define RN5T618_DC1DAC			0x36
+#define RN5T618_DC2DAC			0x37
+#define RN5T618_DC3DAC			0x38
+#define RN5T618_DC1DAC_SLP		0x3b
+#define RN5T618_DC2DAC_SLP		0x3c
+#define RN5T618_DC3DAC_SLP		0x3d
+#define RN5T618_DCIREN			0x40
+#define RN5T618_DCIRQ			0x41
+#define RN5T618_DCIRMON			0x42
+#define RN5T618_LDOEN1			0x44
+#define RN5T618_LDOEN2			0x45
+#define RN5T618_LDODIS			0x46
+#define RN5T618_LDO1DAC			0x4c
+#define RN5T618_LDO2DAC			0x4d
+#define RN5T618_LDO3DAC			0x4e
+#define RN5T618_LDO4DAC			0x4f
+#define RN5T618_LDO5DAC			0x50
+#define RN5T618_LDORTCDAC		0x56
+#define RN5T618_LDORTC2DAC		0x57
+#define RN5T618_LDO1DAC_SLP		0x58
+#define RN5T618_LDO2DAC_SLP		0x59
+#define RN5T618_LDO3DAC_SLP		0x5a
+#define RN5T618_LDO4DAC_SLP		0x5b
+#define RN5T618_LDO5DAC_SLP		0x5c
+#define RN5T618_ADCCNT1			0x64
+#define RN5T618_ADCCNT2			0x65
+#define RN5T618_ADCCNT3			0x66
+#define RN5T618_ILIMDATAH		0x68
+#define RN5T618_ILIMDATAL		0x69
+#define RN5T618_VBATDATAH		0x6a
+#define RN5T618_VBATDATAL		0x6b
+#define RN5T618_VADPDATAH		0x6c
+#define RN5T618_VADPDATAL		0x6d
+#define RN5T618_VUSBDATAH		0x6e
+#define RN5T618_VUSBDATAL		0x6f
+#define RN5T618_VSYSDATAH		0x70
+#define RN5T618_VSYSDATAL		0x71
+#define RN5T618_VTHMDATAH		0x72
+#define RN5T618_VTHMDATAL		0x73
+#define RN5T618_AIN1DATAH		0x74
+#define RN5T618_AIN1DATAL		0x75
+#define RN5T618_AIN0DATAH		0x76
+#define RN5T618_AIN0DATAL		0x77
+#define RN5T618_ILIMTHL			0x78
+#define RN5T618_ILIMTHH			0x79
+#define RN5T618_VBATTHL			0x7a
+#define RN5T618_VBATTHH			0x7b
+#define RN5T618_VADPTHL			0x7c
+#define RN5T618_VADPTHH			0x7d
+#define RN5T618_VUSBTHL			0x7e
+#define RN5T618_VUSBTHH			0x7f
+#define RN5T618_VSYSTHL			0x80
+#define RN5T618_VSYSTHH			0x81
+#define RN5T618_VTHMTHL			0x82
+#define RN5T618_VTHMTHH			0x83
+#define RN5T618_AIN1THL			0x84
+#define RN5T618_AIN1THH			0x85
+#define RN5T618_AIN0THL			0x86
+#define RN5T618_AIN0THH			0x87
+#define RN5T618_EN_ADCIR1		0x88
+#define RN5T618_EN_ADCIR2		0x89
+#define RN5T618_EN_ADCIR3		0x8a
+#define RN5T618_IR_ADC1			0x8c
+#define RN5T618_IR_ADC2			0x8d
+#define RN5T618_IR_ADC3			0x8e
+#define RN5T618_IOSEL			0x90
+#define RN5T618_IOOUT			0x91
+#define RN5T618_GPEDGE1			0x92
+#define RN5T618_GPEDGE2			0x93
+#define RN5T618_EN_GPIR			0x94
+#define RN5T618_IR_GPR			0x95
+#define RN5T618_IR_GPF			0x96
+#define RN5T618_MON_IOIN		0x97
+#define RN5T618_GPLED_FUNC		0x98
+#define RN5T618_INTPOL			0x9c
+#define RN5T618_INTEN			0x9d
+#define RN5T618_INTMON			0x9e
+#define RN5T618_PREVINDAC		0xb0
+#define RN5T618_BATDAC			0xb1
+#define RN5T618_CHGCTL1			0xb3
+#define RN5T618_CHGCTL2			0xb4
+#define RN5T618_VSYSSET			0xb5
+#define RN5T618_REGISET1		0xb6
+#define RN5T618_REGISET2		0xb7
+#define RN5T618_CHGISET			0xb8
+#define RN5T618_TIMSET			0xb9
+#define RN5T618_BATSET1			0xba
+#define RN5T618_BATSET2			0xbb
+#define RN5T618_DIESET			0xbc
+#define RN5T618_CHGSTATE		0xbd
+#define RN5T618_CHGCTRL_IRFMASK		0xbe
+#define RN5T618_CHGSTAT_IRFMASK1	0xbf
+#define RN5T618_CHGSTAT_IRFMASK2	0xc0
+#define RN5T618_CHGERR_IRFMASK		0xc1
+#define RN5T618_CHGCTRL_IRR		0xc2
+#define RN5T618_CHGSTAT_IRR1		0xc3
+#define RN5T618_CHGSTAT_IRR2		0xc4
+#define RN5T618_CHGERR_IRR		0xc5
+#define RN5T618_CHGCTRL_MONI		0xc6
+#define RN5T618_CHGSTAT_MONI1		0xc7
+#define RN5T618_CHGSTAT_MONI2		0xc8
+#define RN5T618_CHGERR_MONI		0xc9
+#define RN5T618_CHGCTRL_DETMOD1		0xca
+#define RN5T618_CHGCTRL_DETMOD2		0xcb
+#define RN5T618_CHGSTAT_DETMOD1		0xcc
+#define RN5T618_CHGSTAT_DETMOD2		0xcd
+#define RN5T618_CHGSTAT_DETMOD3		0xce
+#define RN5T618_CHGERR_DETMOD1		0xcf
+#define RN5T618_CHGERR_DETMOD2		0xd0
+#define RN5T618_CHGOSCCTL		0xd4
+#define RN5T618_CHGOSCSCORESET1		0xd5
+#define RN5T618_CHGOSCSCORESET2		0xd6
+#define RN5T618_CHGOSCSCORESET3		0xd7
+#define RN5T618_CHGOSCFREQSET1		0xd8
+#define RN5T618_CHGOSCFREQSET2		0xd9
+#define RN5T618_CONTROL			0xe0
+#define RN5T618_SOC			0xe1
+#define RN5T618_RE_CAP_H		0xe2
+#define RN5T618_RE_CAP_L		0xe3
+#define RN5T618_FA_CAP_H		0xe4
+#define RN5T618_FA_CAP_L		0xe5
+#define RN5T618_AGE			0xe6
+#define RN5T618_TT_EMPTY_H		0xe7
+#define RN5T618_TT_EMPTY_L		0xe8
+#define RN5T618_TT_FULL_H		0xe9
+#define RN5T618_TT_FULL_L		0xea
+#define RN5T618_VOLTAGE_1		0xeb
+#define RN5T618_VOLTAGE_0		0xec
+#define RN5T618_TEMP_1			0xed
+#define RN5T618_TEMP_0			0xee
+#define RN5T618_CC_CTRL			0xef
+#define RN5T618_CC_COUNT2		0xf0
+#define RN5T618_CC_COUNT1		0xf1
+#define RN5T618_CC_COUNT0		0xf2
+#define RN5T618_CC_SUMREG3		0xf3
+#define RN5T618_CC_SUMREG2		0xf4
+#define RN5T618_CC_SUMREG1		0xf5
+#define RN5T618_CC_SUMREG0		0xf6
+#define RN5T618_CC_OFFREG1		0xf7
+#define RN5T618_CC_OFFREG0		0xf8
+#define RN5T618_CC_GAINREG1		0xf9
+#define RN5T618_CC_GAINREG0		0xfa
+#define RN5T618_CC_AVEREG1		0xfb
+#define RN5T618_CC_AVEREG0		0xfc
+#define RN5T618_MAX_REG			0xfc
+
+#define RN5T618_REPCNT_REPWRON		BIT(0)
+#define RN5T618_SLPCNT_SWPWROFF		BIT(0)
+#define RN5T618_WATCHDOG_WDOGEN		BIT(2)
+#define RN5T618_WATCHDOG_WDOGTIM_M	(BIT(0) | BIT(1))
+#define RN5T618_WATCHDOG_WDOGTIM_S	0
+#define RN5T618_PWRIRQ_IR_WDOG		BIT(6)
+
+enum {
+	RN5T618_DCDC1,
+	RN5T618_DCDC2,
+	RN5T618_DCDC3,
+	RN5T618_LDO1,
+	RN5T618_LDO2,
+	RN5T618_LDO3,
+	RN5T618_LDO4,
+	RN5T618_LDO5,
+	RN5T618_LDORTC1,
+	RN5T618_LDORTC2,
+	RN5T618_REG_NUM,
+};
+
+struct rn5t618 {
+	struct regmap *regmap;
+};
+
+#endif /* __LINUX_MFD_RN5T618_H */