This device is very simple, it supports only one LDO. This single LDO is
programmed over I2C to 16 possible voltages.
Signed-off-by: Marek Vasut marek.va...@gmail.com
---
drivers/regulator/Kconfig |6 +
drivers/regulator/Makefile |1 +
drivers/regulator/isl6271a-regulator.c | 199
3 files changed, 206 insertions(+), 0 deletions(-)
create mode 100644 drivers/regulator/isl6271a-regulator.c
diff --git a/drivers/regulator/Kconfig b/drivers/regulator/Kconfig
index 04f2e08..6772ca7 100644
--- a/drivers/regulator/Kconfig
+++ b/drivers/regulator/Kconfig
@@ -201,5 +201,11 @@ config REGULATOR_88PM8607
help
This driver supports 88PM8607 voltage regulator chips.
+config REGULATOR_ISL6271A
+ tristate Intersil ISL6271A Power regulator
+ depends on I2C
+ help
+ This driver supports ISL6271A voltage regulator chip.
+
endif
diff --git a/drivers/regulator/Makefile b/drivers/regulator/Makefile
index 4e7feec..e2191bf 100644
--- a/drivers/regulator/Makefile
+++ b/drivers/regulator/Makefile
@@ -31,5 +31,6 @@ obj-$(CONFIG_REGULATOR_AB3100) += ab3100.o
obj-$(CONFIG_REGULATOR_TPS65023) += tps65023-regulator.o
obj-$(CONFIG_REGULATOR_TPS6507X) += tps6507x-regulator.o
obj-$(CONFIG_REGULATOR_88PM8607) += 88pm8607.o
+obj-$(CONFIG_REGULATOR_ISL6271A) += isl6271a-regulator.o
ccflags-$(CONFIG_REGULATOR_DEBUG) += -DDEBUG
diff --git a/drivers/regulator/isl6271a-regulator.c
b/drivers/regulator/isl6271a-regulator.c
new file mode 100644
index 000..41cddc7
--- /dev/null
+++ b/drivers/regulator/isl6271a-regulator.c
@@ -0,0 +1,199 @@
+/*
+ * isl6271a-regulator.c
+ *
+ * Support for Intersil ISL6271A voltage regulator
+ *
+ * Copyright (C) 2010 Marek Vasut marek.va...@gmail.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 version 2.
+ *
+ * This program is distributed as is WITHOUT ANY WARRANTY of any kind,
+ * whether express or implied; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ */
+
+#include linux/kernel.h
+#include linux/module.h
+#include linux/init.h
+#include linux/err.h
+#include linux/platform_device.h
+#include linux/regulator/driver.h
+#include linux/i2c.h
+#include linux/delay.h
+#include linux/slab.h
+
+/* Supported voltage values for regulators */
+static const u32 core_buck_table[] = {
+85, 90, 95, 100,
+ 105, 110, 115, 120,
+ 125, 130, 135, 140,
+ 145, 150, 155, 160,
+};
+
+/* PMIC details */
+struct isl_pmic {
+ struct regulator_desc desc;
+ struct i2c_client *client;
+ struct regulator_dev*rdev;
+ struct mutexmtx;
+};
+
+static int isl6271a_get_voltage(struct regulator_dev *dev)
+{
+ struct isl_pmic *pmic = rdev_get_drvdata(dev);
+ int idx, data;
+
+ mutex_lock(pmic-mtx);
+
+ idx = i2c_smbus_read_byte(pmic-client);
+ if (idx 0) {
+ dev_err(pmic-client-dev, Error getting voltage\n);
+ data = idx;
+ goto out;
+ }
+
+ data = core_buck_table[idx 0xf];
+
+out:
+ mutex_unlock(pmic-mtx);
+ return data;
+}
+
+static int isl6271a_set_voltage(struct regulator_dev *dev, int minuV, int
maxuV)
+{
+ struct isl_pmic *pmic = rdev_get_drvdata(dev);
+ int vsel, err;
+ int pmic_minuV = core_buck_table[0];
+ int pmic_maxuV = core_buck_table[ARRAY_SIZE(core_buck_table) - 1];
+
+ if (minuV pmic_minuV || minuV pmic_maxuV)
+ return -EINVAL;
+ if (maxuV pmic_minuV || maxuV pmic_maxuV)
+ return -EINVAL;
+
+ for (vsel = 0; vsel ARRAY_SIZE(core_buck_table); vsel++) {
+ int uV = core_buck_table[vsel];
+
+ if (minuV = uV uV = maxuV)
+ break;
+ }
+
+ if (vsel == ARRAY_SIZE(core_buck_table))
+ return -EINVAL;
+
+ mutex_lock(pmic-mtx);
+
+ err = i2c_smbus_write_byte(pmic-client, vsel);
+ if (err 0)
+ dev_err(pmic-client-dev, Error setting voltage\n);
+
+ mutex_unlock(pmic-mtx);
+ return err;
+}
+
+static int isl6271a_list_voltage(struct regulator_dev *dev, unsigned selector)
+{
+ return core_buck_table[selector];
+}
+
+static struct regulator_ops isl_core_ops = {
+ .get_voltage= isl6271a_get_voltage,
+ .set_voltage= isl6271a_set_voltage,
+ .list_voltage = isl6271a_list_voltage,
+};
+
+static int __devinit isl6271a_probe(struct i2c_client *client,
+const struct i2c_device_id *id)
+{
+ struct regulator_init_data *init_data = client-dev.platform_data;
+ struct isl_pmic *pmic;
+
