263 lines
6.3 KiB
C
263 lines
6.3 KiB
C
/*
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* wm831x-isink.c -- Current sink driver for the WM831x series
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*
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* Copyright 2009 Wolfson Microelectronics PLC.
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*
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* Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*/
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/init.h>
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#include <linux/bitops.h>
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#include <linux/err.h>
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#include <linux/i2c.h>
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#include <linux/platform_device.h>
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#include <linux/regulator/driver.h>
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#include <linux/slab.h>
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#include <linux/mfd/wm831x/core.h>
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#include <linux/mfd/wm831x/regulator.h>
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#include <linux/mfd/wm831x/pdata.h>
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#define WM831X_ISINK_MAX_NAME 7
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struct wm831x_isink {
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char name[WM831X_ISINK_MAX_NAME];
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struct regulator_desc desc;
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int reg;
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struct wm831x *wm831x;
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struct regulator_dev *regulator;
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};
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static int wm831x_isink_enable(struct regulator_dev *rdev)
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{
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struct wm831x_isink *isink = rdev_get_drvdata(rdev);
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struct wm831x *wm831x = isink->wm831x;
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int ret;
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/* We have a two stage enable: first start the ISINK... */
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ret = wm831x_set_bits(wm831x, isink->reg, WM831X_CS1_ENA,
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WM831X_CS1_ENA);
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if (ret != 0)
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return ret;
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/* ...then enable drive */
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ret = wm831x_set_bits(wm831x, isink->reg, WM831X_CS1_DRIVE,
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WM831X_CS1_DRIVE);
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if (ret != 0)
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wm831x_set_bits(wm831x, isink->reg, WM831X_CS1_ENA, 0);
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return ret;
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}
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static int wm831x_isink_disable(struct regulator_dev *rdev)
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{
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struct wm831x_isink *isink = rdev_get_drvdata(rdev);
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struct wm831x *wm831x = isink->wm831x;
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int ret;
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ret = wm831x_set_bits(wm831x, isink->reg, WM831X_CS1_DRIVE, 0);
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if (ret < 0)
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return ret;
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ret = wm831x_set_bits(wm831x, isink->reg, WM831X_CS1_ENA, 0);
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if (ret < 0)
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return ret;
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return ret;
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}
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static int wm831x_isink_is_enabled(struct regulator_dev *rdev)
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{
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struct wm831x_isink *isink = rdev_get_drvdata(rdev);
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struct wm831x *wm831x = isink->wm831x;
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int ret;
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ret = wm831x_reg_read(wm831x, isink->reg);
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if (ret < 0)
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return ret;
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if ((ret & (WM831X_CS1_ENA | WM831X_CS1_DRIVE)) ==
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(WM831X_CS1_ENA | WM831X_CS1_DRIVE))
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return 1;
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else
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return 0;
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}
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static int wm831x_isink_set_current(struct regulator_dev *rdev,
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int min_uA, int max_uA)
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{
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struct wm831x_isink *isink = rdev_get_drvdata(rdev);
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struct wm831x *wm831x = isink->wm831x;
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int ret, i;
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for (i = 0; i < ARRAY_SIZE(wm831x_isinkv_values); i++) {
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int val = wm831x_isinkv_values[i];
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if (min_uA >= val && val <= max_uA) {
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ret = wm831x_set_bits(wm831x, isink->reg,
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WM831X_CS1_ISEL_MASK, i);
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return ret;
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}
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}
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return -EINVAL;
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}
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static int wm831x_isink_get_current(struct regulator_dev *rdev)
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{
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struct wm831x_isink *isink = rdev_get_drvdata(rdev);
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struct wm831x *wm831x = isink->wm831x;
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int ret;
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ret = wm831x_reg_read(wm831x, isink->reg);
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if (ret < 0)
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return ret;
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ret &= WM831X_CS1_ISEL_MASK;
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if (ret > WM831X_ISINK_MAX_ISEL)
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ret = WM831X_ISINK_MAX_ISEL;
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return wm831x_isinkv_values[ret];
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}
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static struct regulator_ops wm831x_isink_ops = {
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.is_enabled = wm831x_isink_is_enabled,
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.enable = wm831x_isink_enable,
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.disable = wm831x_isink_disable,
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.set_current_limit = wm831x_isink_set_current,
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.get_current_limit = wm831x_isink_get_current,
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};
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static irqreturn_t wm831x_isink_irq(int irq, void *data)
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{
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struct wm831x_isink *isink = data;
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regulator_notifier_call_chain(isink->regulator,
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REGULATOR_EVENT_OVER_CURRENT,
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NULL);
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return IRQ_HANDLED;
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}
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static __devinit int wm831x_isink_probe(struct platform_device *pdev)
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{
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struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
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struct wm831x_pdata *pdata = wm831x->dev->platform_data;
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struct wm831x_isink *isink;
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int id = pdev->id % ARRAY_SIZE(pdata->isink);
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struct resource *res;
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int ret, irq;
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dev_dbg(&pdev->dev, "Probing ISINK%d\n", id + 1);
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if (pdata == NULL || pdata->isink[id] == NULL)
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return -ENODEV;
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isink = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_isink),
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GFP_KERNEL);
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if (isink == NULL) {
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dev_err(&pdev->dev, "Unable to allocate private data\n");
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return -ENOMEM;
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}
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isink->wm831x = wm831x;
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res = platform_get_resource(pdev, IORESOURCE_IO, 0);
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if (res == NULL) {
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dev_err(&pdev->dev, "No I/O resource\n");
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ret = -EINVAL;
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goto err;
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}
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isink->reg = res->start;
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/* For current parts this is correct; probably need to revisit
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* in future.
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*/
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snprintf(isink->name, sizeof(isink->name), "ISINK%d", id + 1);
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isink->desc.name = isink->name;
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isink->desc.id = id;
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isink->desc.ops = &wm831x_isink_ops;
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isink->desc.type = REGULATOR_CURRENT;
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isink->desc.owner = THIS_MODULE;
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isink->regulator = regulator_register(&isink->desc, &pdev->dev,
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pdata->isink[id], isink, NULL);
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if (IS_ERR(isink->regulator)) {
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ret = PTR_ERR(isink->regulator);
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dev_err(wm831x->dev, "Failed to register ISINK%d: %d\n",
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id + 1, ret);
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goto err;
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}
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irq = platform_get_irq(pdev, 0);
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ret = request_threaded_irq(irq, NULL, wm831x_isink_irq,
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IRQF_TRIGGER_RISING, isink->name, isink);
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if (ret != 0) {
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dev_err(&pdev->dev, "Failed to request ISINK IRQ %d: %d\n",
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irq, ret);
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goto err_regulator;
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}
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platform_set_drvdata(pdev, isink);
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return 0;
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err_regulator:
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regulator_unregister(isink->regulator);
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err:
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return ret;
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}
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static __devexit int wm831x_isink_remove(struct platform_device *pdev)
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{
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struct wm831x_isink *isink = platform_get_drvdata(pdev);
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platform_set_drvdata(pdev, NULL);
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free_irq(platform_get_irq(pdev, 0), isink);
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regulator_unregister(isink->regulator);
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return 0;
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}
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static struct platform_driver wm831x_isink_driver = {
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.probe = wm831x_isink_probe,
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.remove = __devexit_p(wm831x_isink_remove),
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.driver = {
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.name = "wm831x-isink",
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.owner = THIS_MODULE,
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},
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};
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static int __init wm831x_isink_init(void)
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{
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int ret;
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ret = platform_driver_register(&wm831x_isink_driver);
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if (ret != 0)
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pr_err("Failed to register WM831x ISINK driver: %d\n", ret);
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return ret;
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}
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subsys_initcall(wm831x_isink_init);
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static void __exit wm831x_isink_exit(void)
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{
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platform_driver_unregister(&wm831x_isink_driver);
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}
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module_exit(wm831x_isink_exit);
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/* Module information */
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MODULE_AUTHOR("Mark Brown");
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MODULE_DESCRIPTION("WM831x current sink driver");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("platform:wm831x-isink");
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