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max8903: adds support for initiation via device tree

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Adds support for device tree to setup a max8903 battery charger. DC and USB
validity are determined by looking the presence of the dok and uok gpios.

Signed-off-by: Chris Lapa <chris@lapa.com.au>
Reviewed-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Signed-off-by: Sebastian Reichel <sre@kernel.org>
This commit is contained in:
Chris Lapa 2016-06-24 12:26:12 +10:00 committed by Sebastian Reichel
parent 4aff217e77
commit c5ed330794
1 changed files with 72 additions and 6 deletions
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78
drivers/power/max8903_charger.c
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@ -23,6 +23,9 @@
#include <linux/gpio.h>
#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/of_gpio.h>
#include <linux/slab.h>
#include <linux/power_supply.h>
#include <linux/platform_device.h>
@ -75,6 +78,7 @@ static int max8903_get_property(struct power_supply *psy,
default:
return -EINVAL;
}
return 0;
}
@ -179,6 +183,56 @@ static irqreturn_t max8903_fault(int irq, void *_data)
return IRQ_HANDLED;
}
static struct max8903_pdata *max8903_parse_dt_data(struct device *dev)
{
struct device_node *np = dev->of_node;
struct max8903_pdata *pdata = NULL;
if (!np)
return NULL;
pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
if (!pdata)
return NULL;
pdata->dc_valid = false;
pdata->usb_valid = false;
pdata->cen = of_get_named_gpio(np, "cen-gpios", 0);
if (!gpio_is_valid(pdata->cen))
pdata->cen = -EINVAL;
pdata->chg = of_get_named_gpio(np, "chg-gpios", 0);
if (!gpio_is_valid(pdata->chg))
pdata->chg = -EINVAL;
pdata->flt = of_get_named_gpio(np, "flt-gpios", 0);
if (!gpio_is_valid(pdata->flt))
pdata->flt = -EINVAL;
pdata->usus = of_get_named_gpio(np, "usus-gpios", 0);
if (!gpio_is_valid(pdata->usus))
pdata->usus = -EINVAL;
pdata->dcm = of_get_named_gpio(np, "dcm-gpios", 0);
if (!gpio_is_valid(pdata->dcm))
pdata->dcm = -EINVAL;
pdata->dok = of_get_named_gpio(np, "dok-gpios", 0);
if (!gpio_is_valid(pdata->dok))
pdata->dok = -EINVAL;
else
pdata->dc_valid = true;
pdata->uok = of_get_named_gpio(np, "uok-gpios", 0);
if (!gpio_is_valid(pdata->uok))
pdata->uok = -EINVAL;
else
pdata->usb_valid = true;
return pdata;
}
static int max8903_setup_gpios(struct platform_device *pdev)
{
struct max8903_data *data = platform_get_drvdata(pdev);
@ -298,16 +352,20 @@ static int max8903_probe(struct platform_device *pdev)
struct power_supply_config psy_cfg = {};
int ret = 0;
if (pdata == NULL) {
dev_err(dev, "No platform data.\n");
return -EINVAL;
}
data = devm_kzalloc(dev, sizeof(struct max8903_data), GFP_KERNEL);
if (!data)
return -ENOMEM;
data->pdata = pdev->dev.platform_data;
if (IS_ENABLED(CONFIG_OF) && !pdata && dev->of_node)
pdata = max8903_parse_dt_data(dev);
if (!pdata) {
dev_err(dev, "No platform data.\n");
return -EINVAL;
}
pdev->dev.platform_data = pdata;
data->pdata = pdata;
data->dev = dev;
platform_set_drvdata(pdev, data);
@ -328,6 +386,7 @@ static int max8903_probe(struct platform_device *pdev)
data->psy_desc.properties = max8903_charger_props;
data->psy_desc.num_properties = ARRAY_SIZE(max8903_charger_props);
psy_cfg.of_node = dev->of_node;
psy_cfg.drv_data = data;
data->psy = devm_power_supply_register(dev, &data->psy_desc, &psy_cfg);
@ -378,10 +437,17 @@ static int max8903_probe(struct platform_device *pdev)
return 0;
}
static const struct of_device_id max8903_match_ids[] = {
{ .compatible = "maxim,max8903", },
{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, max8903_match_ids);
static struct platform_driver max8903_driver = {
.probe = max8903_probe,
.driver = {
.name = "max8903-charger",
.of_match_table = max8903_match_ids
},
};