--- /dev/null
+/*
+ * AS3711 PMIC regulator driver, using DCDC Step Down and LDO supplies
+ *
+ * Copyright (C) 2012 Renesas Electronics Corporation
+ * Author: Guennadi Liakhovetski, <g.liakhovetski@gmx.de>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the version 2 of the GNU General Public License as
+ * published by the Free Software Foundation
+ */
+
+#include <linux/err.h>
+#include <linux/init.h>
+#include <linux/mfd/as3711.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+#include <linux/regulator/driver.h>
+#include <linux/regulator/of_regulator.h>
+#include <linux/slab.h>
+
+struct as3711_regulator_info {
+ struct regulator_desc desc;
+};
+
+struct as3711_regulator {
+ struct as3711_regulator_info *reg_info;
+};
+
+/*
+ * The regulator API supports 4 modes of operataion: FAST, NORMAL, IDLE and
+ * STANDBY. We map them in the following way to AS3711 SD1-4 DCDC modes:
+ * FAST: sdX_fast=1
+ * NORMAL: low_noise=1
+ * IDLE: low_noise=0
+ */
+
+static int as3711_set_mode_sd(struct regulator_dev *rdev, unsigned int mode)
+{
+ unsigned int fast_bit = rdev->desc->enable_mask,
+ low_noise_bit = fast_bit << 4;
+ u8 val;
+
+ switch (mode) {
+ case REGULATOR_MODE_FAST:
+ val = fast_bit | low_noise_bit;
+ break;
+ case REGULATOR_MODE_NORMAL:
+ val = low_noise_bit;
+ break;
+ case REGULATOR_MODE_IDLE:
+ val = 0;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ return regmap_update_bits(rdev->regmap, AS3711_SD_CONTROL_1,
+ low_noise_bit | fast_bit, val);
+}
+
+static unsigned int as3711_get_mode_sd(struct regulator_dev *rdev)
+{
+ unsigned int fast_bit = rdev->desc->enable_mask,
+ low_noise_bit = fast_bit << 4, mask = fast_bit | low_noise_bit;
+ unsigned int val;
+ int ret = regmap_read(rdev->regmap, AS3711_SD_CONTROL_1, &val);
+
+ if (ret < 0)
+ return ret;
+
+ if ((val & mask) == mask)
+ return REGULATOR_MODE_FAST;
+
+ if ((val & mask) == low_noise_bit)
+ return REGULATOR_MODE_NORMAL;
+
+ if (!(val & mask))
+ return REGULATOR_MODE_IDLE;
+
+ return -EINVAL;
+}
+
+static struct regulator_ops as3711_sd_ops = {
+ .is_enabled = regulator_is_enabled_regmap,
+ .enable = regulator_enable_regmap,
+ .disable = regulator_disable_regmap,
+ .get_voltage_sel = regulator_get_voltage_sel_regmap,
+ .set_voltage_sel = regulator_set_voltage_sel_regmap,
+ .list_voltage = regulator_list_voltage_linear_range,
+ .map_voltage = regulator_map_voltage_linear_range,
+ .get_mode = as3711_get_mode_sd,
+ .set_mode = as3711_set_mode_sd,
+};
+
+static struct regulator_ops as3711_aldo_ops = {
+ .is_enabled = regulator_is_enabled_regmap,
+ .enable = regulator_enable_regmap,
+ .disable = regulator_disable_regmap,
+ .get_voltage_sel = regulator_get_voltage_sel_regmap,
+ .set_voltage_sel = regulator_set_voltage_sel_regmap,
+ .list_voltage = regulator_list_voltage_linear_range,
+ .map_voltage = regulator_map_voltage_linear_range,
+};
+
+static struct regulator_ops as3711_dldo_ops = {
+ .is_enabled = regulator_is_enabled_regmap,
+ .enable = regulator_enable_regmap,
+ .disable = regulator_disable_regmap,
+ .get_voltage_sel = regulator_get_voltage_sel_regmap,
+ .set_voltage_sel = regulator_set_voltage_sel_regmap,
+ .list_voltage = regulator_list_voltage_linear_range,
+ .map_voltage = regulator_map_voltage_linear_range,
+};
+
+static const struct regulator_linear_range as3711_sd_ranges[] = {
+ REGULATOR_LINEAR_RANGE(612500, 0x1, 0x40, 12500),
+ REGULATOR_LINEAR_RANGE(1425000, 0x41, 0x70, 25000),
+ REGULATOR_LINEAR_RANGE(2650000, 0x71, 0x7f, 50000),
+};
+
+static const struct regulator_linear_range as3711_aldo_ranges[] = {
+ REGULATOR_LINEAR_RANGE(1200000, 0, 0xf, 50000),
+ REGULATOR_LINEAR_RANGE(1800000, 0x10, 0x1f, 100000),
+};
+
+static const struct regulator_linear_range as3711_dldo_ranges[] = {
+ REGULATOR_LINEAR_RANGE(900000, 0, 0x10, 50000),
+ REGULATOR_LINEAR_RANGE(1750000, 0x20, 0x3f, 50000),
+};
+
+#define AS3711_REG(_id, _en_reg, _en_bit, _vmask, _sfx) \
+ [AS3711_REGULATOR_ ## _id] = { \
+ .desc = { \
+ .name = "as3711-regulator-" # _id, \
+ .id = AS3711_REGULATOR_ ## _id, \
+ .n_voltages = (_vmask + 1), \
+ .ops = &as3711_ ## _sfx ## _ops, \
+ .type = REGULATOR_VOLTAGE, \
+ .owner = THIS_MODULE, \
+ .vsel_reg = AS3711_ ## _id ## _VOLTAGE, \
+ .vsel_mask = _vmask, \
+ .enable_reg = AS3711_ ## _en_reg, \
+ .enable_mask = BIT(_en_bit), \
+ .linear_ranges = as3711_ ## _sfx ## _ranges, \
+ .n_linear_ranges = ARRAY_SIZE(as3711_ ## _sfx ## _ranges), \
+ }, \
+}
+
+static struct as3711_regulator_info as3711_reg_info[] = {
+ AS3711_REG(SD_1, SD_CONTROL, 0, 0x7f, sd),
+ AS3711_REG(SD_2, SD_CONTROL, 1, 0x7f, sd),
+ AS3711_REG(SD_3, SD_CONTROL, 2, 0x7f, sd),
+ AS3711_REG(SD_4, SD_CONTROL, 3, 0x7f, sd),
+ AS3711_REG(LDO_1, LDO_1_VOLTAGE, 7, 0x1f, aldo),
+ AS3711_REG(LDO_2, LDO_2_VOLTAGE, 7, 0x1f, aldo),
+ AS3711_REG(LDO_3, LDO_3_VOLTAGE, 7, 0x3f, dldo),
+ AS3711_REG(LDO_4, LDO_4_VOLTAGE, 7, 0x3f, dldo),
+ AS3711_REG(LDO_5, LDO_5_VOLTAGE, 7, 0x3f, dldo),
+ AS3711_REG(LDO_6, LDO_6_VOLTAGE, 7, 0x3f, dldo),
+ AS3711_REG(LDO_7, LDO_7_VOLTAGE, 7, 0x3f, dldo),
+ AS3711_REG(LDO_8, LDO_8_VOLTAGE, 7, 0x3f, dldo),
+ /* StepUp output voltage depends on supplying regulator */
+};
+
+#define AS3711_REGULATOR_NUM ARRAY_SIZE(as3711_reg_info)
+
+static struct of_regulator_match
+as3711_regulator_matches[AS3711_REGULATOR_NUM] = {
+ [AS3711_REGULATOR_SD_1] = { .name = "sd1" },
+ [AS3711_REGULATOR_SD_2] = { .name = "sd2" },
+ [AS3711_REGULATOR_SD_3] = { .name = "sd3" },
+ [AS3711_REGULATOR_SD_4] = { .name = "sd4" },
+ [AS3711_REGULATOR_LDO_1] = { .name = "ldo1" },
+ [AS3711_REGULATOR_LDO_2] = { .name = "ldo2" },
+ [AS3711_REGULATOR_LDO_3] = { .name = "ldo3" },
+ [AS3711_REGULATOR_LDO_4] = { .name = "ldo4" },
+ [AS3711_REGULATOR_LDO_5] = { .name = "ldo5" },
+ [AS3711_REGULATOR_LDO_6] = { .name = "ldo6" },
+ [AS3711_REGULATOR_LDO_7] = { .name = "ldo7" },
+ [AS3711_REGULATOR_LDO_8] = { .name = "ldo8" },
+};
+
+static int as3711_regulator_parse_dt(struct device *dev,
+ struct device_node **of_node, const int count)
+{
+ struct as3711_regulator_pdata *pdata = dev_get_platdata(dev);
+ struct device_node *regulators =
+ of_get_child_by_name(dev->parent->of_node, "regulators");
+ struct of_regulator_match *match;
+ int ret, i;
+
+ if (!regulators) {
+ dev_err(dev, "regulator node not found\n");
+ return -ENODEV;
+ }
+
+ ret = of_regulator_match(dev->parent, regulators,
+ as3711_regulator_matches, count);
+ of_node_put(regulators);
+ if (ret < 0) {
+ dev_err(dev, "Error parsing regulator init data: %d\n", ret);
+ return ret;
+ }
+
+ for (i = 0, match = as3711_regulator_matches; i < count; i++, match++)
+ if (match->of_node) {
+ pdata->init_data[i] = match->init_data;
+ of_node[i] = match->of_node;
+ }
+
+ return 0;
+}
+
+static int as3711_regulator_probe(struct platform_device *pdev)
+{
+ struct as3711_regulator_pdata *pdata = dev_get_platdata(&pdev->dev);
+ struct as3711 *as3711 = dev_get_drvdata(pdev->dev.parent);
+ struct regulator_config config = {.dev = &pdev->dev,};
+ struct as3711_regulator *reg = NULL;
+ struct as3711_regulator *regs;
+ struct device_node *of_node[AS3711_REGULATOR_NUM] = {};
+ struct regulator_dev *rdev;
+ struct as3711_regulator_info *ri;
+ int ret;
+ int id;
+
+ if (!pdata) {
+ dev_err(&pdev->dev, "No platform data...\n");
+ return -ENODEV;
+ }
+
+ if (pdev->dev.parent->of_node) {
+ ret = as3711_regulator_parse_dt(&pdev->dev, of_node, AS3711_REGULATOR_NUM);
+ if (ret < 0) {
+ dev_err(&pdev->dev, "DT parsing failed: %d\n", ret);
+ return ret;
+ }
+ }
+
+ regs = devm_kzalloc(&pdev->dev, AS3711_REGULATOR_NUM *
+ sizeof(struct as3711_regulator), GFP_KERNEL);
+ if (!regs)
+ return -ENOMEM;
+
+ for (id = 0, ri = as3711_reg_info; id < AS3711_REGULATOR_NUM; ++id, ri++) {
+ reg = ®s[id];
+ reg->reg_info = ri;
+
+ config.init_data = pdata->init_data[id];
+ config.driver_data = reg;
+ config.regmap = as3711->regmap;
+ config.of_node = of_node[id];
+
+ rdev = devm_regulator_register(&pdev->dev, &ri->desc, &config);
+ if (IS_ERR(rdev)) {
+ dev_err(&pdev->dev, "Failed to register regulator %s\n",
+ ri->desc.name);
+ return PTR_ERR(rdev);
+ }
+ }
+ platform_set_drvdata(pdev, regs);
+ return 0;
+}
+
+static struct platform_driver as3711_regulator_driver = {
+ .driver = {
+ .name = "as3711-regulator",
+ },
+ .probe = as3711_regulator_probe,
+};
+
+static int __init as3711_regulator_init(void)
+{
+ return platform_driver_register(&as3711_regulator_driver);
+}
+subsys_initcall(as3711_regulator_init);
+
+static void __exit as3711_regulator_exit(void)
+{
+ platform_driver_unregister(&as3711_regulator_driver);
+}
+module_exit(as3711_regulator_exit);
+
+MODULE_AUTHOR("Guennadi Liakhovetski <g.liakhovetski@gmx.de>");
+MODULE_DESCRIPTION("AS3711 regulator driver");
+MODULE_ALIAS("platform:as3711-regulator");
+MODULE_LICENSE("GPL v2");
Code Review / kvmfornfv.git / blobdiff