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regulator: Add WM831x DC-DC boost convertor support 

The WM831x series of PMICs include a single DC-DC boost convertor.
This adds basic support for this convertor.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Acked-by: Liam Girdwood <lrg@slimlogic.co.uk>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
This commit is contained in:
Mark Brown 2009-07-28 15:23:16 +01:00 committed by Samuel Ortiz
parent 8267a9ba82
commit 1304850d4c
1 changed files with 131 additions and 0 deletions
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131
drivers/regulator/wm831x-dcdc.c
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@ -613,6 +613,132 @@ static struct platform_driver wm831x_buckp_driver = {
},
};
/*
* DCDC boost convertors
*/
static int wm831x_boostp_get_status(struct regulator_dev *rdev)
{
struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
struct wm831x *wm831x = dcdc->wm831x;
int ret;
/* First, check for errors */
ret = wm831x_reg_read(wm831x, WM831X_DCDC_UV_STATUS);
if (ret < 0)
return ret;
if (ret & (1 << rdev_get_id(rdev))) {
dev_dbg(wm831x->dev, "DCDC%d under voltage\n",
rdev_get_id(rdev) + 1);
return REGULATOR_STATUS_ERROR;
}
/* Is the regulator on? */
ret = wm831x_reg_read(wm831x, WM831X_DCDC_STATUS);
if (ret < 0)
return ret;
if (ret & (1 << rdev_get_id(rdev)))
return REGULATOR_STATUS_ON;
else
return REGULATOR_STATUS_OFF;
}
static struct regulator_ops wm831x_boostp_ops = {
.get_status = wm831x_boostp_get_status,
.is_enabled = wm831x_dcdc_is_enabled,
.enable = wm831x_dcdc_enable,
.disable = wm831x_dcdc_disable,
};
static __devinit int wm831x_boostp_probe(struct platform_device *pdev)
{
struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
struct wm831x_pdata *pdata = wm831x->dev->platform_data;
int id = pdev->id % ARRAY_SIZE(pdata->dcdc);
struct wm831x_dcdc *dcdc;
struct resource *res;
int ret, irq;
dev_dbg(&pdev->dev, "Probing DCDC%d\n", id + 1);
if (pdata == NULL || pdata->dcdc[id] == NULL)
return -ENODEV;
dcdc = kzalloc(sizeof(struct wm831x_dcdc), GFP_KERNEL);
if (dcdc == NULL) {
dev_err(&pdev->dev, "Unable to allocate private data\n");
return -ENOMEM;
}
dcdc->wm831x = wm831x;
res = platform_get_resource(pdev, IORESOURCE_IO, 0);
if (res == NULL) {
dev_err(&pdev->dev, "No I/O resource\n");
ret = -EINVAL;
goto err;
}
dcdc->base = res->start;
snprintf(dcdc->name, sizeof(dcdc->name), "DCDC%d", id + 1);
dcdc->desc.name = dcdc->name;
dcdc->desc.id = id;
dcdc->desc.type = REGULATOR_VOLTAGE;
dcdc->desc.ops = &wm831x_boostp_ops;
dcdc->desc.owner = THIS_MODULE;
dcdc->regulator = regulator_register(&dcdc->desc, &pdev->dev,
pdata->dcdc[id], dcdc);
if (IS_ERR(dcdc->regulator)) {
ret = PTR_ERR(dcdc->regulator);
dev_err(wm831x->dev, "Failed to register DCDC%d: %d\n",
id + 1, ret);
goto err;
}
irq = platform_get_irq_byname(pdev, "UV");
ret = wm831x_request_irq(wm831x, irq, wm831x_dcdc_uv_irq,
IRQF_TRIGGER_RISING, dcdc->name,
dcdc);
if (ret != 0) {
dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n",
irq, ret);
goto err_regulator;
}
platform_set_drvdata(pdev, dcdc);
return 0;
err_regulator:
regulator_unregister(dcdc->regulator);
err:
kfree(dcdc);
return ret;
}
static __devexit int wm831x_boostp_remove(struct platform_device *pdev)
{
struct wm831x_dcdc *dcdc = platform_get_drvdata(pdev);
struct wm831x *wm831x = dcdc->wm831x;
wm831x_free_irq(wm831x, platform_get_irq_byname(pdev, "UV"), dcdc);
regulator_unregister(dcdc->regulator);
kfree(dcdc);
return 0;
}
static struct platform_driver wm831x_boostp_driver = {
.probe = wm831x_boostp_probe,
.remove = __devexit_p(wm831x_boostp_remove),
.driver = {
.name = "wm831x-boostp",
},
};
/*
* External Power Enable
*
@ -707,6 +833,10 @@ static int __init wm831x_dcdc_init(void)
if (ret != 0)
pr_err("Failed to register WM831x BUCKP driver: %d\n", ret);
ret = platform_driver_register(&wm831x_boostp_driver);
if (ret != 0)
pr_err("Failed to register WM831x BOOST driver: %d\n", ret);
ret = platform_driver_register(&wm831x_epe_driver);
if (ret != 0)
pr_err("Failed to register WM831x EPE driver: %d\n", ret);
@ -718,6 +848,7 @@ subsys_initcall(wm831x_dcdc_init);
static void __exit wm831x_dcdc_exit(void)
{
platform_driver_unregister(&wm831x_epe_driver);
platform_driver_unregister(&wm831x_boostp_driver);
platform_driver_unregister(&wm831x_buckp_driver);
platform_driver_unregister(&wm831x_buckv_driver);
}