Fixed MTP to work with TWRP

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");