On Mon 08 Aug 11:11 PDT 2016, Linus Walleij wrote:
> This adds a driver for the six PM8058 LEDs, three ordinary LEDs,
> two "flash" LEDs and one "keypad" LED.
>
> The "keypad" and "flash" LEDs are not really hard-wired to these
> usecases: for example on the APQ8060 Dragonboard, the "keypad"
> LED is instead used to drive an IR LED used for the proximity
> sensor. The "flash" LEDs are just ordinary high-current LED
> drivers.
>
> Cc: linux-arm-msm@xxxxxxxxxxxxxxx
> Cc: Andy Gross <andy.gross@xxxxxxxxxx>
> Cc: Stephen Boyd <sboyd@xxxxxxxxxxxxxx>
> Cc: Bjorn Andersson <bjorn.andersson@xxxxxxxxxx>
> Signed-off-by: Linus Walleij <linus.walleij@xxxxxxxxxx>
> ---
[..]
> diff --git a/drivers/leds/leds-pm8058.c b/drivers/leds/leds-pm8058.c
[..]
> +#include <linux/init.h>
I don't see any uses of this.
> +#include <linux/leds.h>
> +#include <linux/module.h>
> +#include <linux/of.h>
> +#include <linux/platform_device.h>
> +#include <linux/pm.h>
> +#include <linux/regmap.h>
> +#include <linux/slab.h>
Dito
> +#include <linux/spinlock.h>
Dito
> +
> +#define PM8058_LED_TYPE_COMMON 0x00
> +#define PM8058_LED_TYPE_KEYPAD 0x01
> +#define PM8058_LED_TYPE_FLASH 0x02
> +
> +#define PM8058_LED_TYPE_COMMON_MASK 0xf8
> +#define PM8058_LED_TYPE_KEYPAD_MASK 0xf0
> +#define PM8058_LED_TYPE_COMMON_SHIFT 3
> +#define PM8058_LED_TYPE_KEYPAD_SHIFT 4
> +
> +struct pm8058_led {
> + struct regmap *map;
> + unsigned int reg;
reg should be u32, as you pass it to of_property_read_u32()
> + u32 ledtype;
> + struct led_classdev cdev;
> +};
> +
> +static void pm8058_led_set(struct led_classdev *cled,
> + enum led_brightness value)
> +{
> + struct pm8058_led *led;
> + int ret = 0;
> +
> + led = container_of(cled, struct pm8058_led, cdev);
> + switch (led->ledtype) {
> + case PM8058_LED_TYPE_COMMON:
> + ret = regmap_update_bits(led->map, led->reg,
> + PM8058_LED_TYPE_COMMON_MASK,
> + value << PM8058_LED_TYPE_COMMON_SHIFT);
> + break;
> + case PM8058_LED_TYPE_KEYPAD:
> + case PM8058_LED_TYPE_FLASH:
> + ret = regmap_update_bits(led->map, led->reg,
> + PM8058_LED_TYPE_KEYPAD_MASK,
> + value << PM8058_LED_TYPE_KEYPAD_SHIFT);
> + break;
> + default:
"default" shouldn't ever happen, so I think you should have the switch
massage value and pick a mask and then move the regmap_update_bits()
after the switch.
> + break;
> + }
> + if (ret)
> + pr_err("Failed to set LED brightness\n");
> +}
> +
> +static enum led_brightness pm8058_led_get(struct led_classdev *cled)
> +{
> + struct pm8058_led *led;
> + int ret;
> + u32 val;
regmap_read takes an unsigned int.
> +
> + led = container_of(cled, struct pm8058_led, cdev);
> + switch (led->ledtype) {
> + case PM8058_LED_TYPE_COMMON:
> + ret = regmap_read(led->map, led->reg, &val);
> + if (ret) {
> + pr_err("Failed to get LED brightness\n");
> + return LED_OFF;
> + }
> + return ((val & PM8058_LED_TYPE_COMMON_MASK) >>
> + PM8058_LED_TYPE_COMMON_SHIFT);
> + case PM8058_LED_TYPE_KEYPAD:
> + case PM8058_LED_TYPE_FLASH:
> + ret = regmap_read(led->map, led->reg, &val);
> + if (ret) {
> + pr_err("Failed to get LED brightness\n");
> + return LED_OFF;
> + }
> + return ((val & PM8058_LED_TYPE_KEYPAD_MASK) >>
> + PM8058_LED_TYPE_KEYPAD_SHIFT);
> + default:
"default" should never happen.
> + break;
> + }
I think you should move the read above the switch statement, then have
the cases massage the value and have a common return here.
regmap_read(&val)
if (error)
...
switch (type)
case ...:
val &= MASK;
val >>= SHIFT;
break;
case ...;
...
return val;
Would look cleaner.
> +
> + return LED_OFF;
> +}
> +
> +static const struct of_device_id pm8058_leds_id_table[] = {
> + {
> + .compatible = "qcom,pm8058-led",
> + .data = (void *)PM8058_LED_TYPE_COMMON
> + },
> + {
> + .compatible = "qcom,pm8058-keypad-led",
> + .data = (void *)PM8058_LED_TYPE_KEYPAD
> + },
> + {
> + .compatible = "qcom,pm8058-flash-led",
> + .data = (void *)PM8058_LED_TYPE_FLASH
> + },
> + { },
> +};
> +MODULE_DEVICE_TABLE(of, pm8058_leds_id_table);
> +
> +static int pm8058_led_probe(struct platform_device *pdev)
> +{
> + struct pm8058_led *led;
> + struct device_node *np = pdev->dev.of_node;
> + int ret;
> + struct regmap *map;
> + const struct of_device_id *match;
> + const char *state;
> +
> + led = devm_kzalloc(&pdev->dev, sizeof(*led), GFP_KERNEL);
> + if (led == NULL)
if (!led)
> + return -ENOMEM;
> +
> + match = of_match_node(pm8058_leds_id_table, np);
> + if (!match)
> + return -ENXIO;
> + led->ledtype = (u32)match->data;
Use of_device_get_match_data() instead, then you can keep the
pm8058_leds_id_table at the bottom of the file.
> +
> + map = dev_get_regmap(pdev->dev.parent, NULL);
> + if (!map) {
> + dev_err(&pdev->dev, "Parent regmap unavailable.\n");
> + return -ENXIO;
> + }
> + led->map = map;
> +
> + ret = of_property_read_u32(np, "reg", &led->reg);
> + if (ret) {
> + dev_err(&pdev->dev, "no register offset specified\n");
> + return -EINVAL;
> + }
> +
> + /* Use label else node name */
> + led->cdev.name = of_get_property(np, "label", NULL) ? : np->name;
> + led->cdev.default_trigger =
> + of_get_property(np, "linux,default-trigger", NULL);
> + led->cdev.brightness_set = pm8058_led_set;
> + led->cdev.brightness_get = pm8058_led_get;
> + led->cdev.max_brightness = 15;
For the "common" LED you have 5 bits of precision.
> +
> + state = of_get_property(np, "default-state", NULL);
> + if (state) {
> + if (!strcmp(state, "keep")) {
> + led->cdev.brightness = pm8058_led_get(&led->cdev);
> + } else if (!strcmp(state, "on")) {
> + led->cdev.brightness = LED_FULL;
> + pm8058_led_set(&led->cdev, LED_FULL);
It's kinda ugly to let regmap_update_bits() shave off the upper 3 or 4
bits of LED_FULL. Perhaps pass max_brightness here instead?
There's no need to limit the paramter inside pm8058_led_set(), as
subsequent calls to set_brightness() will pass through a min(value,
max).
> + } else {
> + led->cdev.brightness = LED_OFF;
> + pm8058_led_set(&led->cdev, LED_OFF);
> + }
> + }
> + led->cdev.flags = LED_CORE_SUSPENDRESUME;
I can see this being a feature for the keyboard and flash, but for the
"common" LEDs I don't think this is the right thing to do.
> +
> + ret = devm_led_classdev_register(&pdev->dev, &led->cdev);
> + if (ret) {
> + dev_err(&pdev->dev, "unable to register led \"%s\"\n",
> + led->cdev.name);
> + return ret;
> + }
> + platform_set_drvdata(pdev, led);
You don't retrieve the drvdata, so no need to set it.
> +
> + return 0;
> +}
> +
> +static struct platform_driver pm8058_led_driver = {
> + .probe = pm8058_led_probe,
> + .driver = {
> + .name = "pm8058-leds",
> + .of_match_table = pm8058_leds_id_table,
> + },
> +};
> +module_platform_driver(pm8058_led_driver);
> +
> +MODULE_DESCRIPTION("PM8058 LEDs driver");
> +MODULE_LICENSE("GPL v2");
> +MODULE_ALIAS("platform:pm8058-leds");
Regards,
Bjorn
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