Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / drivers / regulator / isl6271a-regulator.c

diff --git a/kernel/drivers/regulator/isl6271a-regulator.c b/kernel/drivers/regulator/isl6271a-regulator.c
new file mode 100644 (file)
index 0000000..6e5da95
--- /dev/null
+++ b/kernel/drivers/regulator/isl6271a-regulator.c
@@ -0,0 +1,180 @@
+/*
+ * isl6271a-regulator.c
+ *
+ * Support for Intersil ISL6271A voltage regulator
+ *
+ * Copyright (C) 2010 Marek Vasut <marek.vasut@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/slab.h>
+
+#define        ISL6271A_VOLTAGE_MIN    850000
+#define        ISL6271A_VOLTAGE_MAX    1600000
+#define        ISL6271A_VOLTAGE_STEP   50000
+
+/* PMIC details */
+struct isl_pmic {
+       struct i2c_client       *client;
+       struct regulator_dev    *rdev[3];
+       struct mutex            mtx;
+};
+
+static int isl6271a_get_voltage_sel(struct regulator_dev *dev)
+{
+       struct isl_pmic *pmic = rdev_get_drvdata(dev);
+       int idx;
+
+       mutex_lock(&pmic->mtx);
+
+       idx = i2c_smbus_read_byte(pmic->client);
+       if (idx < 0)
+               dev_err(&pmic->client->dev, "Error getting voltage\n");
+
+       mutex_unlock(&pmic->mtx);
+       return idx;
+}
+
+static int isl6271a_set_voltage_sel(struct regulator_dev *dev,
+                                   unsigned selector)
+{
+       struct isl_pmic *pmic = rdev_get_drvdata(dev);
+       int err;
+
+       mutex_lock(&pmic->mtx);
+
+       err = i2c_smbus_write_byte(pmic->client, selector);
+       if (err < 0)
+               dev_err(&pmic->client->dev, "Error setting voltage\n");
+
+       mutex_unlock(&pmic->mtx);
+       return err;
+}
+
+static struct regulator_ops isl_core_ops = {
+       .get_voltage_sel = isl6271a_get_voltage_sel,
+       .set_voltage_sel = isl6271a_set_voltage_sel,
+       .list_voltage   = regulator_list_voltage_linear,
+       .map_voltage    = regulator_map_voltage_linear,
+};
+
+static struct regulator_ops isl_fixed_ops = {
+       .list_voltage   = regulator_list_voltage_linear,
+};
+
+static const struct regulator_desc isl_rd[] = {
+       {
+               .name           = "Core Buck",
+               .id             = 0,
+               .n_voltages     = 16,
+               .ops            = &isl_core_ops,
+               .type           = REGULATOR_VOLTAGE,
+               .owner          = THIS_MODULE,
+               .min_uV         = ISL6271A_VOLTAGE_MIN,
+               .uV_step        = ISL6271A_VOLTAGE_STEP,
+       }, {
+               .name           = "LDO1",
+               .id             = 1,
+               .n_voltages     = 1,
+               .ops            = &isl_fixed_ops,
+               .type           = REGULATOR_VOLTAGE,
+               .owner          = THIS_MODULE,
+               .min_uV         = 1100000,
+       }, {
+               .name           = "LDO2",
+               .id             = 2,
+               .n_voltages     = 1,
+               .ops            = &isl_fixed_ops,
+               .type           = REGULATOR_VOLTAGE,
+               .owner          = THIS_MODULE,
+               .min_uV         = 1300000,
+       },
+};
+
+static int isl6271a_probe(struct i2c_client *i2c,
+                                    const struct i2c_device_id *id)
+{
+       struct regulator_config config = { };
+       struct regulator_init_data *init_data   = dev_get_platdata(&i2c->dev);
+       struct isl_pmic *pmic;
+       int i;
+
+       if (!i2c_check_functionality(i2c->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
+               return -EIO;
+
+       pmic = devm_kzalloc(&i2c->dev, sizeof(struct isl_pmic), GFP_KERNEL);
+       if (!pmic)
+               return -ENOMEM;
+
+       pmic->client = i2c;
+
+       mutex_init(&pmic->mtx);
+
+       for (i = 0; i < 3; i++) {
+               config.dev = &i2c->dev;
+               if (i == 0)
+                       config.init_data = init_data;
+               else
+                       config.init_data = NULL;
+               config.driver_data = pmic;
+
+               pmic->rdev[i] = devm_regulator_register(&i2c->dev, &isl_rd[i],
+                                                       &config);
+               if (IS_ERR(pmic->rdev[i])) {
+                       dev_err(&i2c->dev, "failed to register %s\n", id->name);
+                       return PTR_ERR(pmic->rdev[i]);
+               }
+       }
+
+       i2c_set_clientdata(i2c, 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,
+       .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@gmail.com>");
+MODULE_DESCRIPTION("Intersil ISL6271A voltage regulator driver");
+MODULE_LICENSE("GPL v2");