[PATCH 1/2] ISL6271A voltage regulator support.
Marek Vasut
marek.vasut at gmail.com
Mon Jun 7 01:18:27 EDT 2010
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.vasut at gmail.com>
---
drivers/regulator/Kconfig | 6 +
drivers/regulator/Makefile | 1 +
drivers/regulator/isl6271a-regulator.c | 202 ++++++++++++++++++++++++++++++++
3 files changed, 209 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 0000000..c6fd20f
--- /dev/null
+++ b/drivers/regulator/isl6271a-regulator.c
@@ -0,0 +1,202 @@
+/*
+ * isl6271a-regulator.c
+ *
+ * Support for Intersil ISL6271A voltage regulator
+ *
+ * Copyright (C) 2010 Marek Vasut <marek.vasut at 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/regulator/machine.h>
+#include <linux/i2c.h>
+#include <linux/delay.h>
+#include <linux/slab.h>
+
+/* Supported voltage values for regulators */
+static const u16 core_buck_table[] = {
+ 850, 900, 950, 1000,
+ 1050, 1100, 1150, 1200,
+ 1250, 1300, 1350, 1400,
+ 1450, 1500, 1550, 1600,
+};
+
+/* PMIC details */
+struct isl_pmic {
+ struct regulator_desc desc;
+ struct i2c_client *client;
+ struct regulator_dev *rdev;
+ struct mutex mtx;
+};
+
+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_data(pmic->client, 0);
+ 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 idx;
+}
+
+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_data(pmic->client, 0, 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;
+ int err;
+
+ if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
+ return -EIO;
+
+ if (!init_data)
+ return -EIO;
+
+ pmic = kzalloc(sizeof(struct isl_pmic), GFP_KERNEL);
+ if (!pmic)
+ return -ENOMEM;
+
+ pmic->client = client;
+
+ mutex_init(&pmic->mtx);
+
+ pmic->desc.name = "Core Buck";
+ pmic->desc.id = 0;
+ pmic->desc.n_voltages = ARRAY_SIZE(core_buck_table);
+ pmic->desc.ops = &isl_core_ops;
+ pmic->desc.type = REGULATOR_VOLTAGE;
+ pmic->desc.owner = THIS_MODULE;
+
+ pmic->rdev = regulator_register(&pmic->desc, &client->dev,
+ init_data, pmic);
+ if (IS_ERR(pmic->rdev)) {
+ dev_err(&client->dev, "failed to register %s\n",
+ id->name);
+ err = PTR_ERR(pmic->rdev);
+ goto error;
+ }
+
+ i2c_set_clientdata(client, pmic);
+
+ return 0;
+
+error:
+ regulator_unregister(pmic->rdev);
+
+ kfree(pmic);
+ return err;
+}
+
+static int __devexit isl6271a_remove(struct i2c_client *client)
+{
+ struct isl_pmic *pmic = i2c_get_clientdata(client);
+
+ i2c_set_clientdata(client, NULL);
+
+ regulator_unregister(pmic->rdev);
+
+ kfree(pmic);
+
+ return 0;
+}
+
+static const struct i2c_device_id isl6271a_id[] = {
+ {.name = "isl6271a", 0 },
+ { },
+};
+
+MODULE_DEVICE_TABLE(i2c, isl6271a_id);
+
+static struct i2c_driver isl6271a_i2c_driver = {
+ .driver = {
+ .name = "isl6271a",
+ .owner = THIS_MODULE,
+ },
+ .probe = isl6271a_probe,
+ .remove = __devexit_p(isl6271a_remove),
+ .id_table = isl6271a_id,
+};
+
+static int __init isl6271a_init(void)
+{
+ return i2c_add_driver(&isl6271a_i2c_driver);
+}
+
+static void __exit isl6271a_cleanup(void)
+{
+ i2c_del_driver(&isl6271a_i2c_driver);
+}
+
+subsys_initcall(isl6271a_init);
+module_exit(isl6271a_cleanup);
+
+MODULE_AUTHOR("Marek Vasut <marek.vasut at gmail.com>");
+MODULE_DESCRIPTION("Intersil ISL6271A voltage regulator driver");
+MODULE_LICENSE("GPL v2");
--
1.7.1
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