--- /dev/null
+/*
+ * 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");
Code Review / kvmfornfv.git / blobdiff