summaryrefslogtreecommitdiffstats
path: root/drivers/regulator/isl6271a-regulator.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/regulator/isl6271a-regulator.c')
-rw-r--r--drivers/regulator/isl6271a-regulator.c171
1 files changed, 171 insertions, 0 deletions
diff --git a/drivers/regulator/isl6271a-regulator.c b/drivers/regulator/isl6271a-regulator.c
new file mode 100644
index 0000000000..69b4afe95e
--- /dev/null
+++ b/drivers/regulator/isl6271a-regulator.c
@@ -0,0 +1,171 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * isl6271a-regulator.c
+ *
+ * Support for Intersil ISL6271A voltage regulator
+ *
+ * Copyright (C) 2010 Marek Vasut <marek.vasut@gmail.com>
+ */
+
+#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 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 const 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 const 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 = i2c_client_get_device_id(i2c);
+ struct regulator_dev *rdev;
+ 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;
+
+ rdev = devm_regulator_register(&i2c->dev, &isl_rd[i], &config);
+ if (IS_ERR(rdev)) {
+ dev_err(&i2c->dev, "failed to register %s\n", id->name);
+ return PTR_ERR(rdev);
+ }
+ }
+
+ 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",
+ .probe_type = PROBE_PREFER_ASYNCHRONOUS,
+ },
+ .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");