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Message-Id: <1248702372-29534-19-git-send-email-broonie@opensource.wolfsonmicro.com>
Date: Mon, 27 Jul 2009 14:46:09 +0100
From: Mark Brown <broonie@...nsource.wolfsonmicro.com>
To: Samuel Ortiz <sameo@...ux.intel.com>
Cc: linux-kernel@...r.kernel.org,
Mark Brown <broonie@...nsource.wolfsonmicro.com>,
Liam Girdwood <lrg@...mlogic.co.uk>
Subject: [PATCH 19/22] 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@...nsource.wolfsonmicro.com>
Cc: Liam Girdwood <lrg@...mlogic.co.uk>
---
drivers/regulator/wm831x-dcdc.c | 131 +++++++++++++++++++++++++++++++++++++++
1 files changed, 131 insertions(+), 0 deletions(-)
diff --git a/drivers/regulator/wm831x-dcdc.c b/drivers/regulator/wm831x-dcdc.c
index 97ae40f..3251e22 100644
--- a/drivers/regulator/wm831x-dcdc.c
+++ b/drivers/regulator/wm831x-dcdc.c
@@ -614,6 +614,132 @@ 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->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
*
* These aren't actually DCDCs but look like them in hardware so share
@@ -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);
}
--
1.6.3.3
--
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