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>
diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index fc419da..82f70dc 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -597,6 +597,17 @@
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 d58068a..aa5a73a 100644
--- a/drivers/mfd/Makefile
+++ b/drivers/mfd/Makefile
@@ -160,6 +160,7 @@
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 0000000..6668571
--- /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");
