On 06/17/2016 07:00 AM, Chris Lapa wrote:
> From: Chris Lapa <chris@xxxxxxxxxxx>
>
> 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@xxxxxxxxxxx>
> ---
> drivers/power/max8903_charger.c | 217 +++++++++++++++++++++++++++-------------
> 1 file changed, 145 insertions(+), 72 deletions(-)
>
> diff --git a/drivers/power/max8903_charger.c b/drivers/power/max8903_charger.c
> index 5ddc667..3c59213 100644
> --- a/drivers/power/max8903_charger.c
> +++ b/drivers/power/max8903_charger.c
> @@ -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;
> }
>
> @@ -179,48 +183,116 @@ 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 *of_node = dev->of_node;
Common naming convention for device_node is just 'np':
struct device_node *np = dev->of_node;
It is shorter and already spread in the kernel.
> + struct max8903_pdata *pdata = NULL;
> +
> + if (!of_node)
> + return NULL;
> +
> + pdata = devm_kzalloc(dev, sizeof(*pdata),
> + GFP_KERNEL);
No need to break the line.
> + if (!pdata)
> + return NULL;
> +
> + pdata->dc_valid = false;
> + pdata->usb_valid = false;
> +
> + pdata->cen = of_get_named_gpio(of_node, "cen-gpios", 0);
> + if (!gpio_is_valid(pdata->cen))
> + pdata->cen = -EINVAL;
> +
> + pdata->chg = of_get_named_gpio(of_node, "chg-gpios", 0);
> + if (!gpio_is_valid(pdata->chg))
> + pdata->chg = -EINVAL;
> +
> + pdata->flt = of_get_named_gpio(of_node, "flt-gpios", 0);
> + if (!gpio_is_valid(pdata->flt))
> + pdata->flt = -EINVAL;
> +
> + pdata->usus = of_get_named_gpio(of_node, "usus-gpios", 0);
> + if (!gpio_is_valid(pdata->usus))
> + pdata->usus = -EINVAL;
> +
> + pdata->dcm = of_get_named_gpio(of_node, "dcm-gpios", 0);
> + if (!gpio_is_valid(pdata->dcm))
> + pdata->dcm = -EINVAL;
> +
> + pdata->dok = of_get_named_gpio(of_node, "dok-gpios", 0);
> + if (!gpio_is_valid(pdata->dok))
> + pdata->dok = -EINVAL;
> + else
> + pdata->dc_valid = true;
> +
> + pdata->uok = of_get_named_gpio(of_node, "uok-gpios", 0);
> + if (!gpio_is_valid(pdata->uok))
> + pdata->uok = -EINVAL;
> + else
> + pdata->usb_valid = true;
> +
> + return pdata;
> +}
> +
> static int max8903_probe(struct platform_device *pdev)
> {
> - struct max8903_data *data;
> + struct max8903_data *charger;
> struct device *dev = &pdev->dev;
> - struct max8903_pdata *pdata = pdev->dev.platform_data;
> struct power_supply_config psy_cfg = {};
> int ret = 0;
> int gpio;
> int ta_in = 0;
> int usb_in = 0;
>
> - if (pdata == NULL) {
> + charger = devm_kzalloc(dev, sizeof(struct max8903_data), GFP_KERNEL);
> + if (!charger)
> + return -ENOMEM;
> +
> + charger->pdata = pdev->dev.platform_data;
> + if (IS_ENABLED(CONFIG_OF) && !charger->pdata && dev->of_node)
> + charger->pdata = max8903_parse_dt_data(dev);
> +
> + if (!charger->pdata) {
> dev_err(dev, "No platform data.\n");
> return -EINVAL;
> }
>
> - data = devm_kzalloc(dev, sizeof(struct max8903_data), GFP_KERNEL);
> - if (!data)
> - return -ENOMEM;
> + charger->dev = dev;
>
> - data->pdata = pdev->dev.platform_data;
> - data->dev = dev;
> - platform_set_drvdata(pdev, data);
> + charger->fault = false;
> + charger->ta_in = ta_in;
> + charger->usb_in = usb_in;
>
> - if (pdata->dc_valid == false && pdata->usb_valid == false) {
> + charger->psy_desc.name = "max8903_charger";
> + charger->psy_desc.type = (ta_in) ? POWER_SUPPLY_TYPE_MAINS :
> + ((usb_in) ? POWER_SUPPLY_TYPE_USB :
> + POWER_SUPPLY_TYPE_BATTERY);
> + charger->psy_desc.get_property = max8903_get_property;
> + charger->psy_desc.properties = max8903_charger_props;
> + charger->psy_desc.num_properties = ARRAY_SIZE(max8903_charger_props);
> +
> + platform_set_drvdata(pdev, charger);
> +
> + if (charger->pdata->dc_valid == false && charger->pdata->usb_valid == false) {
> dev_err(dev, "No valid power sources.\n");
> return -EINVAL;
> }
>
> - if (pdata->dc_valid) {
> - if (gpio_is_valid(pdata->dok)) {
> +
> + if (charger->pdata->dc_valid) {
> + if (gpio_is_valid(charger->pdata->dok)) {
> ret = devm_gpio_request(dev,
> - pdata->dok,
> - data->psy_desc.name);
> + charger->pdata->dok,
> + charger->psy_desc.name);
> if (ret) {
> dev_err(dev,
> "Failed GPIO request for dok: %d err %d\n",
> - pdata->dok, ret);
> + charger->pdata->dok, ret);
I pointed the weird indentation in 4/7. Just a reminder: after fixing it
in 4/7 you also have to adjust it in consecutive patches.
Best regards,
Krzysztof
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