Initial import

1 files changed, 199 insertions, 0 deletions

diff --git a/drivers/regulator/wm8994-regulator.c b/drivers/regulator/wm8994-regulator.c
new file mode 100644
index 000000000..750e0bd61
--- /dev/null
+++ b/drivers/regulator/wm8994-regulator.c
@@ -0,0 +1,199 @@
+/*
+ * wm8994-regulator.c  --  Regulator driver for the WM8994
+ *
+ * Copyright 2009 Wolfson Microelectronics PLC.
+ *
+ * Author: Mark Brown <broonie@opensource.wolfsonmicro.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;  either version 2 of the  License, or (at your
+ *  option) any later version.
+ */
+
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/init.h>
+#include <linux/bitops.h>
+#include <linux/err.h>
+#include <linux/platform_device.h>
+#include <linux/regulator/driver.h>
+#include <linux/regulator/machine.h>
+#include <linux/gpio.h>
+#include <linux/slab.h>
+
+#include <linux/mfd/wm8994/core.h>
+#include <linux/mfd/wm8994/registers.h>
+#include <linux/mfd/wm8994/pdata.h>
+
+struct wm8994_ldo {
+	struct regulator_dev *regulator;
+	struct wm8994 *wm8994;
+	struct regulator_consumer_supply supply;
+	struct regulator_init_data init_data;
+};
+
+#define WM8994_LDO1_MAX_SELECTOR 0x7
+#define WM8994_LDO2_MAX_SELECTOR 0x3
+
+static struct regulator_ops wm8994_ldo1_ops = {
+	.list_voltage = regulator_list_voltage_linear,
+	.map_voltage = regulator_map_voltage_linear,
+	.get_voltage_sel = regulator_get_voltage_sel_regmap,
+	.set_voltage_sel = regulator_set_voltage_sel_regmap,
+};
+
+static int wm8994_ldo2_list_voltage(struct regulator_dev *rdev,
+				    unsigned int selector)
+{
+	struct wm8994_ldo *ldo = rdev_get_drvdata(rdev);
+
+	if (selector > WM8994_LDO2_MAX_SELECTOR)
+		return -EINVAL;
+
+	switch (ldo->wm8994->type) {
+	case WM8994:
+		return (selector * 100000) + 900000;
+	case WM8958:
+		return (selector * 100000) + 1000000;
+	case WM1811:
+		switch (selector) {
+		case 0:
+			return -EINVAL;
+		default:
+			return (selector * 100000) + 950000;
+		}
+		break;
+	default:
+		return -EINVAL;
+	}
+}
+
+static struct regulator_ops wm8994_ldo2_ops = {
+	.list_voltage = wm8994_ldo2_list_voltage,
+	.get_voltage_sel = regulator_get_voltage_sel_regmap,
+	.set_voltage_sel = regulator_set_voltage_sel_regmap,
+};
+
+static const struct regulator_desc wm8994_ldo_desc[] = {
+	{
+		.name = "LDO1",
+		.id = 1,
+		.type = REGULATOR_VOLTAGE,
+		.n_voltages = WM8994_LDO1_MAX_SELECTOR + 1,
+		.vsel_reg = WM8994_LDO_1,
+		.vsel_mask = WM8994_LDO1_VSEL_MASK,
+		.ops = &wm8994_ldo1_ops,
+		.min_uV = 2400000,
+		.uV_step = 100000,
+		.enable_time = 3000,
+		.owner = THIS_MODULE,
+	},
+	{
+		.name = "LDO2",
+		.id = 2,
+		.type = REGULATOR_VOLTAGE,
+		.n_voltages = WM8994_LDO2_MAX_SELECTOR + 1,
+		.vsel_reg = WM8994_LDO_2,
+		.vsel_mask = WM8994_LDO2_VSEL_MASK,
+		.ops = &wm8994_ldo2_ops,
+		.enable_time = 3000,
+		.owner = THIS_MODULE,
+	},
+};
+
+static const struct regulator_consumer_supply wm8994_ldo_consumer[] = {
+	{ .supply = "AVDD1" },
+	{ .supply = "DCVDD" },
+};
+
+static const struct regulator_init_data wm8994_ldo_default[] = {
+	{
+		.constraints = {
+			.valid_ops_mask = REGULATOR_CHANGE_STATUS,
+		},
+		.num_consumer_supplies = 1,
+	},
+	{
+		.constraints = {
+			.valid_ops_mask = REGULATOR_CHANGE_STATUS,
+		},
+		.num_consumer_supplies = 1,
+	},
+};
+
+static int wm8994_ldo_probe(struct platform_device *pdev)
+{
+	struct wm8994 *wm8994 = dev_get_drvdata(pdev->dev.parent);
+	struct wm8994_pdata *pdata = dev_get_platdata(wm8994->dev);
+	int id = pdev->id % ARRAY_SIZE(pdata->ldo);
+	struct regulator_config config = { };
+	struct wm8994_ldo *ldo;
+	int ret;
+
+	dev_dbg(&pdev->dev, "Probing LDO%d\n", id + 1);
+
+	ldo = devm_kzalloc(&pdev->dev, sizeof(struct wm8994_ldo), GFP_KERNEL);
+	if (!ldo)
+		return -ENOMEM;
+
+	ldo->wm8994 = wm8994;
+	ldo->supply = wm8994_ldo_consumer[id];
+	ldo->supply.dev_name = dev_name(wm8994->dev);
+
+	config.dev = wm8994->dev;
+	config.driver_data = ldo;
+	config.regmap = wm8994->regmap;
+	config.init_data = &ldo->init_data;
+	if (pdata) {
+		config.ena_gpio = pdata->ldo[id].enable;
+	} else if (wm8994->dev->of_node) {
+		config.ena_gpio = wm8994->pdata.ldo[id].enable;
+		config.ena_gpio_initialized = true;
+	}
+
+	/* Use default constraints if none set up */
+	if (!pdata || !pdata->ldo[id].init_data || wm8994->dev->of_node) {
+		dev_dbg(wm8994->dev, "Using default init data, supply %s %s\n",
+			ldo->supply.dev_name, ldo->supply.supply);
+
+		ldo->init_data = wm8994_ldo_default[id];
+		ldo->init_data.consumer_supplies = &ldo->supply;
+		if (!config.ena_gpio)
+			ldo->init_data.constraints.valid_ops_mask = 0;
+	} else {
+		ldo->init_data = *pdata->ldo[id].init_data;
+	}
+
+	ldo->regulator = devm_regulator_register(&pdev->dev,
+						 &wm8994_ldo_desc[id],
+						 &config);
+	if (IS_ERR(ldo->regulator)) {
+		ret = PTR_ERR(ldo->regulator);
+		dev_err(wm8994->dev, "Failed to register LDO%d: %d\n",
+			id + 1, ret);
+		goto err;
+	}
+
+	platform_set_drvdata(pdev, ldo);
+
+	return 0;
+
+err:
+	return ret;
+}
+
+static struct platform_driver wm8994_ldo_driver = {
+	.probe = wm8994_ldo_probe,
+	.driver		= {
+		.name	= "wm8994-ldo",
+	},
+};
+
+module_platform_driver(wm8994_ldo_driver);
+
+/* Module information */
+MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
+MODULE_DESCRIPTION("WM8994 LDO driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:wm8994-ldo");