Initial import

1 files changed, 273 insertions, 0 deletions

diff --git a/drivers/mfd/tps65217.c b/drivers/mfd/tps65217.c
new file mode 100644
index 000000000..7d1cfc1d3
--- /dev/null
+++ b/drivers/mfd/tps65217.c
@@ -0,0 +1,273 @@
+/*
+ * tps65217.c
+ *
+ * TPS65217 chip family multi-function driver
+ *
+ * Copyright (C) 2011 Texas Instruments Incorporated - http://www.ti.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/device.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/init.h>
+#include <linux/i2c.h>
+#include <linux/slab.h>
+#include <linux/regmap.h>
+#include <linux/err.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+
+#include <linux/mfd/core.h>
+#include <linux/mfd/tps65217.h>
+
+static const struct mfd_cell tps65217s[] = {
+	{
+		.name = "tps65217-pmic",
+		.of_compatible = "ti,tps65217-pmic",
+	},
+	{
+		.name = "tps65217-bl",
+		.of_compatible = "ti,tps65217-bl",
+	},
+};
+
+/**
+ * tps65217_reg_read: Read a single tps65217 register.
+ *
+ * @tps: Device to read from.
+ * @reg: Register to read.
+ * @val: Contians the value
+ */
+int tps65217_reg_read(struct tps65217 *tps, unsigned int reg,
+			unsigned int *val)
+{
+	return regmap_read(tps->regmap, reg, val);
+}
+EXPORT_SYMBOL_GPL(tps65217_reg_read);
+
+/**
+ * tps65217_reg_write: Write a single tps65217 register.
+ *
+ * @tps65217: Device to write to.
+ * @reg: Register to write to.
+ * @val: Value to write.
+ * @level: Password protected level
+ */
+int tps65217_reg_write(struct tps65217 *tps, unsigned int reg,
+			unsigned int val, unsigned int level)
+{
+	int ret;
+	unsigned int xor_reg_val;
+
+	switch (level) {
+	case TPS65217_PROTECT_NONE:
+		return regmap_write(tps->regmap, reg, val);
+	case TPS65217_PROTECT_L1:
+		xor_reg_val = reg ^ TPS65217_PASSWORD_REGS_UNLOCK;
+		ret = regmap_write(tps->regmap, TPS65217_REG_PASSWORD,
+							xor_reg_val);
+		if (ret < 0)
+			return ret;
+
+		return regmap_write(tps->regmap, reg, val);
+	case TPS65217_PROTECT_L2:
+		xor_reg_val = reg ^ TPS65217_PASSWORD_REGS_UNLOCK;
+		ret = regmap_write(tps->regmap, TPS65217_REG_PASSWORD,
+							xor_reg_val);
+		if (ret < 0)
+			return ret;
+		ret = regmap_write(tps->regmap, reg, val);
+		if (ret < 0)
+			return ret;
+		ret = regmap_write(tps->regmap, TPS65217_REG_PASSWORD,
+							xor_reg_val);
+		if (ret < 0)
+			return ret;
+		return regmap_write(tps->regmap, reg, val);
+	default:
+		return -EINVAL;
+	}
+}
+EXPORT_SYMBOL_GPL(tps65217_reg_write);
+
+/**
+ * tps65217_update_bits: Modify bits w.r.t mask, val and level.
+ *
+ * @tps65217: Device to write to.
+ * @reg: Register to read-write to.
+ * @mask: Mask.
+ * @val: Value to write.
+ * @level: Password protected level
+ */
+static int tps65217_update_bits(struct tps65217 *tps, unsigned int reg,
+		unsigned int mask, unsigned int val, unsigned int level)
+{
+	int ret;
+	unsigned int data;
+
+	ret = tps65217_reg_read(tps, reg, &data);
+	if (ret) {
+		dev_err(tps->dev, "Read from reg 0x%x failed\n", reg);
+		return ret;
+	}
+
+	data &= ~mask;
+	data |= val & mask;
+
+	ret = tps65217_reg_write(tps, reg, data, level);
+	if (ret)
+		dev_err(tps->dev, "Write for reg 0x%x failed\n", reg);
+
+	return ret;
+}
+
+int tps65217_set_bits(struct tps65217 *tps, unsigned int reg,
+		unsigned int mask, unsigned int val, unsigned int level)
+{
+	return tps65217_update_bits(tps, reg, mask, val, level);
+}
+EXPORT_SYMBOL_GPL(tps65217_set_bits);
+
+int tps65217_clear_bits(struct tps65217 *tps, unsigned int reg,
+		unsigned int mask, unsigned int level)
+{
+	return tps65217_update_bits(tps, reg, mask, 0, level);
+}
+EXPORT_SYMBOL_GPL(tps65217_clear_bits);
+
+static const struct regmap_config tps65217_regmap_config = {
+	.reg_bits = 8,
+	.val_bits = 8,
+
+	.max_register = TPS65217_REG_MAX,
+};
+
+static const struct of_device_id tps65217_of_match[] = {
+	{ .compatible = "ti,tps65217", .data = (void *)TPS65217 },
+	{ /* sentinel */ },
+};
+
+static int tps65217_probe(struct i2c_client *client,
+				const struct i2c_device_id *ids)
+{
+	struct tps65217 *tps;
+	unsigned int version;
+	unsigned long chip_id = ids->driver_data;
+	const struct of_device_id *match;
+	bool status_off = false;
+	int ret;
+
+	if (client->dev.of_node) {
+		match = of_match_device(tps65217_of_match, &client->dev);
+		if (!match) {
+			dev_err(&client->dev,
+				"Failed to find matching dt id\n");
+			return -EINVAL;
+		}
+		chip_id = (unsigned long)match->data;
+		status_off = of_property_read_bool(client->dev.of_node,
+					"ti,pmic-shutdown-controller");
+	}
+
+	if (!chip_id) {
+		dev_err(&client->dev, "id is null.\n");
+		return -ENODEV;
+	}
+
+	tps = devm_kzalloc(&client->dev, sizeof(*tps), GFP_KERNEL);
+	if (!tps)
+		return -ENOMEM;
+
+	i2c_set_clientdata(client, tps);
+	tps->dev = &client->dev;
+	tps->id = chip_id;
+
+	tps->regmap = devm_regmap_init_i2c(client, &tps65217_regmap_config);
+	if (IS_ERR(tps->regmap)) {
+		ret = PTR_ERR(tps->regmap);
+		dev_err(tps->dev, "Failed to allocate register map: %d\n",
+			ret);
+		return ret;
+	}
+
+	ret = mfd_add_devices(tps->dev, -1, tps65217s,
+			      ARRAY_SIZE(tps65217s), NULL, 0, NULL);
+	if (ret < 0) {
+		dev_err(tps->dev, "mfd_add_devices failed: %d\n", ret);
+		return ret;
+	}
+
+	ret = tps65217_reg_read(tps, TPS65217_REG_CHIPID, &version);
+	if (ret < 0) {
+		dev_err(tps->dev, "Failed to read revision register: %d\n",
+			ret);
+		return ret;
+	}
+
+	/* Set the PMIC to shutdown on PWR_EN toggle */
+	if (status_off) {
+		ret = tps65217_set_bits(tps, TPS65217_REG_STATUS,
+				TPS65217_STATUS_OFF, TPS65217_STATUS_OFF,
+				TPS65217_PROTECT_NONE);
+		if (ret)
+			dev_warn(tps->dev, "unable to set the status OFF\n");
+	}
+
+	dev_info(tps->dev, "TPS65217 ID %#x version 1.%d\n",
+			(version & TPS65217_CHIPID_CHIP_MASK) >> 4,
+			version & TPS65217_CHIPID_REV_MASK);
+
+	return 0;
+}
+
+static int tps65217_remove(struct i2c_client *client)
+{
+	struct tps65217 *tps = i2c_get_clientdata(client);
+
+	mfd_remove_devices(tps->dev);
+
+	return 0;
+}
+
+static const struct i2c_device_id tps65217_id_table[] = {
+	{"tps65217", TPS65217},
+	{ /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(i2c, tps65217_id_table);
+
+static struct i2c_driver tps65217_driver = {
+	.driver		= {
+		.name	= "tps65217",
+		.owner	= THIS_MODULE,
+		.of_match_table = tps65217_of_match,
+	},
+	.id_table	= tps65217_id_table,
+	.probe		= tps65217_probe,
+	.remove		= tps65217_remove,
+};
+
+static int __init tps65217_init(void)
+{
+	return i2c_add_driver(&tps65217_driver);
+}
+subsys_initcall(tps65217_init);
+
+static void __exit tps65217_exit(void)
+{
+	i2c_del_driver(&tps65217_driver);
+}
+module_exit(tps65217_exit);
+
+MODULE_AUTHOR("AnilKumar Ch <anilkumar@ti.com>");
+MODULE_DESCRIPTION("TPS65217 chip family multi-function driver");
+MODULE_LICENSE("GPL v2");