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1// SPDX-License-Identifier: GPL-2.0+2//3// wm831x-isink.c -- Current sink driver for the WM831x series4//5// Copyright 2009 Wolfson Microelectronics PLC.6//7// Author: Mark Brown <broonie@opensource.wolfsonmicro.com>8 9#include <linux/module.h>10#include <linux/moduleparam.h>11#include <linux/init.h>12#include <linux/bitops.h>13#include <linux/err.h>14#include <linux/i2c.h>15#include <linux/platform_device.h>16#include <linux/regulator/driver.h>17#include <linux/slab.h>18 19#include <linux/mfd/wm831x/core.h>20#include <linux/mfd/wm831x/regulator.h>21#include <linux/mfd/wm831x/pdata.h>22 23#define WM831X_ISINK_MAX_NAME 724 25struct wm831x_isink {26 char name[WM831X_ISINK_MAX_NAME];27 struct regulator_desc desc;28 int reg;29 struct wm831x *wm831x;30 struct regulator_dev *regulator;31};32 33static int wm831x_isink_enable(struct regulator_dev *rdev)34{35 struct wm831x_isink *isink = rdev_get_drvdata(rdev);36 struct wm831x *wm831x = isink->wm831x;37 int ret;38 39 /* We have a two stage enable: first start the ISINK... */40 ret = wm831x_set_bits(wm831x, isink->reg, WM831X_CS1_ENA,41 WM831X_CS1_ENA);42 if (ret != 0)43 return ret;44 45 /* ...then enable drive */46 ret = wm831x_set_bits(wm831x, isink->reg, WM831X_CS1_DRIVE,47 WM831X_CS1_DRIVE);48 if (ret != 0)49 wm831x_set_bits(wm831x, isink->reg, WM831X_CS1_ENA, 0);50 51 return ret;52 53}54 55static int wm831x_isink_disable(struct regulator_dev *rdev)56{57 struct wm831x_isink *isink = rdev_get_drvdata(rdev);58 struct wm831x *wm831x = isink->wm831x;59 int ret;60 61 ret = wm831x_set_bits(wm831x, isink->reg, WM831X_CS1_DRIVE, 0);62 if (ret < 0)63 return ret;64 65 ret = wm831x_set_bits(wm831x, isink->reg, WM831X_CS1_ENA, 0);66 if (ret < 0)67 return ret;68 69 return ret;70 71}72 73static int wm831x_isink_is_enabled(struct regulator_dev *rdev)74{75 struct wm831x_isink *isink = rdev_get_drvdata(rdev);76 struct wm831x *wm831x = isink->wm831x;77 int ret;78 79 ret = wm831x_reg_read(wm831x, isink->reg);80 if (ret < 0)81 return ret;82 83 if ((ret & (WM831X_CS1_ENA | WM831X_CS1_DRIVE)) ==84 (WM831X_CS1_ENA | WM831X_CS1_DRIVE))85 return 1;86 else87 return 0;88}89 90static const struct regulator_ops wm831x_isink_ops = {91 .is_enabled = wm831x_isink_is_enabled,92 .enable = wm831x_isink_enable,93 .disable = wm831x_isink_disable,94 .set_current_limit = regulator_set_current_limit_regmap,95 .get_current_limit = regulator_get_current_limit_regmap,96};97 98static irqreturn_t wm831x_isink_irq(int irq, void *data)99{100 struct wm831x_isink *isink = data;101 102 regulator_notifier_call_chain(isink->regulator,103 REGULATOR_EVENT_OVER_CURRENT,104 NULL);105 106 return IRQ_HANDLED;107}108 109 110static int wm831x_isink_probe(struct platform_device *pdev)111{112 struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);113 struct wm831x_pdata *pdata = dev_get_platdata(wm831x->dev);114 struct wm831x_isink *isink;115 int id = pdev->id % ARRAY_SIZE(pdata->isink);116 struct regulator_config config = { };117 struct resource *res;118 int ret, irq;119 120 dev_dbg(&pdev->dev, "Probing ISINK%d\n", id + 1);121 122 if (pdata == NULL || pdata->isink[id] == NULL)123 return -ENODEV;124 125 isink = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_isink),126 GFP_KERNEL);127 if (!isink)128 return -ENOMEM;129 130 isink->wm831x = wm831x;131 132 res = platform_get_resource(pdev, IORESOURCE_REG, 0);133 if (res == NULL) {134 dev_err(&pdev->dev, "No REG resource\n");135 ret = -EINVAL;136 goto err;137 }138 isink->reg = res->start;139 140 /* For current parts this is correct; probably need to revisit141 * in future.142 */143 snprintf(isink->name, sizeof(isink->name), "ISINK%d", id + 1);144 isink->desc.name = isink->name;145 isink->desc.id = id;146 isink->desc.ops = &wm831x_isink_ops;147 isink->desc.type = REGULATOR_CURRENT;148 isink->desc.owner = THIS_MODULE;149 isink->desc.curr_table = wm831x_isinkv_values;150 isink->desc.n_current_limits = ARRAY_SIZE(wm831x_isinkv_values);151 isink->desc.csel_reg = isink->reg;152 isink->desc.csel_mask = WM831X_CS1_ISEL_MASK;153 154 config.dev = pdev->dev.parent;155 config.init_data = pdata->isink[id];156 config.driver_data = isink;157 config.regmap = wm831x->regmap;158 159 isink->regulator = devm_regulator_register(&pdev->dev, &isink->desc,160 &config);161 if (IS_ERR(isink->regulator)) {162 ret = PTR_ERR(isink->regulator);163 dev_err(wm831x->dev, "Failed to register ISINK%d: %d\n",164 id + 1, ret);165 goto err;166 }167 168 irq = wm831x_irq(wm831x, platform_get_irq(pdev, 0));169 ret = devm_request_threaded_irq(&pdev->dev, irq, NULL,170 wm831x_isink_irq,171 IRQF_TRIGGER_RISING | IRQF_ONESHOT,172 isink->name,173 isink);174 if (ret != 0) {175 dev_err(&pdev->dev, "Failed to request ISINK IRQ %d: %d\n",176 irq, ret);177 goto err;178 }179 180 platform_set_drvdata(pdev, isink);181 182 return 0;183 184err:185 return ret;186}187 188static struct platform_driver wm831x_isink_driver = {189 .probe = wm831x_isink_probe,190 .driver = {191 .name = "wm831x-isink",192 .probe_type = PROBE_PREFER_ASYNCHRONOUS,193 },194};195 196static int __init wm831x_isink_init(void)197{198 int ret;199 ret = platform_driver_register(&wm831x_isink_driver);200 if (ret != 0)201 pr_err("Failed to register WM831x ISINK driver: %d\n", ret);202 203 return ret;204}205subsys_initcall(wm831x_isink_init);206 207static void __exit wm831x_isink_exit(void)208{209 platform_driver_unregister(&wm831x_isink_driver);210}211module_exit(wm831x_isink_exit);212 213/* Module information */214MODULE_AUTHOR("Mark Brown");215MODULE_DESCRIPTION("WM831x current sink driver");216MODULE_LICENSE("GPL");217MODULE_ALIAS("platform:wm831x-isink");218