Re: [PATCH v3 2/2] cap11xx: add LED support

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 




On Mon, Jun 15, 2015 at 3:11 AM, Jacek Anaszewski
<j.anaszewski@xxxxxxxxxxx> wrote:
> On 06/15/2015 10:56 AM, Matt Ranostay wrote:
>>
>> On Mon, Jun 15, 2015 at 1:15 AM, Jacek Anaszewski
>> <j.anaszewski@xxxxxxxxxxx> wrote:
>>>
>>> Hi Matt,
>>>
>>>
>>> On 06/13/2015 06:17 AM, Matt Ranostay wrote:
>>>>
>>>>
>>>> Several cap11xx variants have LEDs that be can be controlled, this
>>>> patchset implements this functionality.
>>>>
>>>> Signed-off-by: Matt Ranostay <mranostay@xxxxxxxxx>
>>>> ---
>>>>    drivers/input/keyboard/cap11xx.c | 121
>>>> ++++++++++++++++++++++++++++++++++++++-
>>>>    1 file changed, 118 insertions(+), 3 deletions(-)
>>>>
>>>> diff --git a/drivers/input/keyboard/cap11xx.c
>>>> b/drivers/input/keyboard/cap11xx.c
>>>> index f07461a..994154c 100644
>>>> --- a/drivers/input/keyboard/cap11xx.c
>>>> +++ b/drivers/input/keyboard/cap11xx.c
>>>> @@ -12,6 +12,7 @@
>>>>    #include <linux/module.h>
>>>>    #include <linux/interrupt.h>
>>>>    #include <linux/input.h>
>>>> +#include <linux/leds.h>
>>>>    #include <linux/of_irq.h>
>>>>    #include <linux/regmap.h>
>>>>    #include <linux/i2c.h>
>>>> @@ -47,6 +48,20 @@
>>>>    #define CAP11XX_REG_CONFIG2           0x44
>>>>    #define CAP11XX_REG_CONFIG2_ALT_POL   BIT(6)
>>>>    #define CAP11XX_REG_SENSOR_BASE_CNT(X)        (0x50 + (X))
>>>> +#define CAP11XX_REG_LED_POLARITY       0x73
>>>> +#define CAP11XX_REG_LED_OUTPUT_CONTROL 0x74
>>>> +
>>>> +#define CAP11XX_REG_LED_DUTY_CYCLE_1   0x90
>>>> +#define CAP11XX_REG_LED_DUTY_CYCLE_2   0x91
>>>> +#define CAP11XX_REG_LED_DUTY_CYCLE_3   0x92
>>>> +#define CAP11XX_REG_LED_DUTY_CYCLE_4   0x93
>>>> +
>>>> +#define CAP11XX_REG_LED_DUTY_MIN_MASK  (0x0f)
>>>> +#define CAP11XX_REG_LED_DUTY_MIN_MASK_SHIFT    (0)
>>>> +#define CAP11XX_REG_LED_DUTY_MAX_MASK  (0xf0)
>>>> +#define CAP11XX_REG_LED_DUTY_MAX_MASK_SHIFT    (4)
>>>> +#define CAP11XX_REG_LED_DUTY_MAX_VALUE (15)
>>>> +
>>>>    #define CAP11XX_REG_SENSOR_CALIB      (0xb1 + (X))
>>>>    #define CAP11XX_REG_SENSOR_CALIB_LSB1 0xb9
>>>>    #define CAP11XX_REG_SENSOR_CALIB_LSB2 0xba
>>>> @@ -56,10 +71,24 @@
>>>>
>>>>    #define CAP11XX_MANUFACTURER_ID       0x5d
>>>>
>>>> +#ifdef CONFIG_LEDS_CLASS
>>>> +struct cap11xx_led {
>>>> +       struct cap11xx_priv *priv;
>>>> +       struct led_classdev cdev;
>>>> +       struct work_struct work;
>>>> +       u32 reg;
>>>> +       enum led_brightness new_brightness;
>>>> +};
>>>> +#endif
>>>> +
>>>>    struct cap11xx_priv {
>>>>          struct regmap *regmap;
>>>>          struct input_dev *idev;
>>>>
>>>> +#ifdef CONFIG_LEDS_CLASS
>>>> +       struct cap11xx_led *leds;
>>>> +       int num_leds;
>>>> +#endif
>>>>          /* config */
>>>>          u32 keycodes[];
>>>>    };
>>>> @@ -67,6 +96,7 @@ struct cap11xx_priv {
>>>>    struct cap11xx_hw_model {
>>>>          u8 product_id;
>>>>          unsigned int num_channels;
>>>> +       unsigned int num_leds;
>>>>    };
>>>>
>>>>    enum {
>>>> @@ -76,9 +106,9 @@ enum {
>>>>    };
>>>>
>>>>    static const struct cap11xx_hw_model cap11xx_devices[] = {
>>>> -       [CAP1106] = { .product_id = 0x55, .num_channels = 6 },
>>>> -       [CAP1126] = { .product_id = 0x53, .num_channels = 6 },
>>>> -       [CAP1188] = { .product_id = 0x50, .num_channels = 8 },
>>>> +       [CAP1106] = { .product_id = 0x55, .num_channels = 6, .num_leds =
>>>> 0
>>>> },
>>>> +       [CAP1126] = { .product_id = 0x53, .num_channels = 6, .num_leds =
>>>> 2
>>>> },
>>>> +       [CAP1188] = { .product_id = 0x50, .num_channels = 8, .num_leds =
>>>> 8
>>>> },
>>>>    };
>>>>
>>>>    static const struct reg_default cap11xx_reg_defaults[] = {
>>>> @@ -111,6 +141,7 @@ static const struct reg_default
>>>> cap11xx_reg_defaults[]
>>>> = {
>>>>          { CAP11XX_REG_STANDBY_SENSITIVITY,      0x02 },
>>>>          { CAP11XX_REG_STANDBY_THRESH,           0x40 },
>>>>          { CAP11XX_REG_CONFIG2,                  0x40 },
>>>> +       { CAP11XX_REG_LED_POLARITY,             0x00 },
>>>>          { CAP11XX_REG_SENSOR_CALIB_LSB1,        0x00 },
>>>>          { CAP11XX_REG_SENSOR_CALIB_LSB2,        0x00 },
>>>>    };
>>>> @@ -196,6 +227,84 @@ static void cap11xx_input_close(struct input_dev
>>>> *idev)
>>>>          cap11xx_set_sleep(priv, true);
>>>>    }
>>>>
>>>> +#ifdef CONFIG_LEDS_CLASS
>>>> +static void cap11xx_led_work(struct work_struct *work)
>>>> +{
>>>> +       struct cap11xx_led *led = container_of(work, struct cap11xx_led,
>>>> work);
>>>> +       struct cap11xx_priv *priv = led->priv;
>>>> +       int value = led->new_brightness;
>>>> +
>>>> +       regmap_update_bits(priv->regmap, CAP11XX_REG_LED_OUTPUT_CONTROL,
>>>> +                               BIT(led->reg), !!value ? BIT(led->reg) :
>>>> 0);
>>>
>>>
>>>
>>> You should set here the brightness value, not only turn the led on/off.
>>>
>>
>> The issue is that the setting is across _ALL_ leds for brightness. But
>> on/off state can clearly vary
>
>
> OK. The comment describing this would be nice here.

Ok will make this more clear in v4.

Thanks,

Matt

>
>
>>>
>>>> +}
>>>> +
>>>> +static void cap11xx_led_set(struct led_classdev *cdev,
>>>> +                          enum led_brightness value)
>>>> +{
>>>> +       struct cap11xx_led *led = container_of(cdev, struct cap11xx_led,
>>>> cdev);
>>>> +
>>>> +       led->new_brightness = value;
>>>> +       schedule_work(&led->work);
>>>> +}
>>>> +
>>>> +static int cap11xx_init_leds(struct device *dev, struct cap11xx_priv
>>>> *priv)
>>>> +{
>>>> +       struct device_node *node = dev->of_node, *child;
>>>> +       struct cap11xx_led *led;
>>>> +       int cnt = of_get_child_count(node);
>>>> +       u32 reg = 0;
>>>> +       int error;
>>>> +
>>>> +       if (!priv->num_leds || !cnt)
>>>> +               return 0;
>>>> +       if (cnt > priv->num_leds)
>>>> +               return -EINVAL;
>>>> +
>>>> +       led = devm_kcalloc(dev, cnt,
>>>> +               sizeof(struct cap11xx_led), GFP_KERNEL);
>>>> +       if (!led)
>>>> +               return -ENOMEM;
>>>> +
>>>> +       priv->leds = led;
>>>> +       error = of_property_read_u32(node, "linux,led-brightness",
>>>> &reg);
>>>> +       if (error || reg > CAP11XX_REG_LED_DUTY_MAX_VALUE)
>>>> +               reg = CAP11XX_REG_LED_DUTY_MAX_VALUE;
>>>
>>>
>>>
>>> This property seems to be redundant, as brightness is controlled with
>>> 'brightness' sysfs property.
>>
>>
>> See above comment.
>>>
>>>
>>>> +       error = regmap_update_bits(priv->regmap,
>>>> CAP11XX_REG_LED_DUTY_CYCLE_4,
>>>> +                               CAP11XX_REG_LED_DUTY_MAX_MASK,
>>>> +                               reg <<
>>>> CAP11XX_REG_LED_DUTY_MAX_MASK_SHIFT);
>>>
>>>
>>>
>>> This probably should be called from brightness_set op.
>>
>>
>> Above :)
>>>
>>>
>>>> +       if (error)
>>>> +               return error;
>>>> +
>>>> +       for_each_child_of_node(node, child) {
>>>> +               led->cdev.name =
>>>> +                       of_get_property(child, "label", NULL) ? :
>>>> child->name;
>>>> +               led->cdev.default_trigger =
>>>> +                       of_get_property(child, "linux,default-trigger",
>>>> NULL);
>>>> +               led->cdev.flags = 0;
>>>
>>>
>>>
>>> You don't need to clear flags, as the memory is zeroed by kcalloc.
>>>
>>>> +               led->cdev.brightness_set = cap11xx_led_set;
>>>> +               led->cdev.max_brightness = 1;
>>>
>>>
>>>
>>> You introduced linux,led-brightness DT property and defined its range
>>> to 0-15 (it should be 1-15 btw), but here you allow for brightness to
>>> be max 1.
>>>
>>>> +               led->cdev.brightness = LED_OFF;
>>>
>>>
>>>> +
>>>>
>>>> +               error = of_property_read_u32(child, "reg", &reg);
>>>> +               if (error != 0 || reg >= priv->num_leds)
>>>> +                       continue;
>>>> +               led->reg = reg;
>>>> +               led->priv = priv;
>>>> +
>>>> +               error = devm_led_classdev_register(dev, &led->cdev);
>>>> +               if (error < 0)
>>>> +                       return -EINVAL;
>>>> +               INIT_WORK(&led->work, cap11xx_led_work);
>>>> +               schedule_work(&led->work);
>>>
>>>
>>>
>>> Work queue should be initialized before registration of the LED class
>>> device.
>>
>> What is the reason for this? Just curious
>
>
> See Daniel's explanation.
>
>
>>>
>>>> +               led++;
>>>> +       };
>>>> +
>>>> +       return 0;
>>>> +}
>>>> +#endif
>>>> +
>>>>    static int cap11xx_i2c_probe(struct i2c_client *i2c_client,
>>>>                               const struct i2c_device_id *id)
>>>>    {
>>>> @@ -316,6 +425,12 @@ static int cap11xx_i2c_probe(struct i2c_client
>>>> *i2c_client,
>>>>          priv->idev->open = cap11xx_input_open;
>>>>          priv->idev->close = cap11xx_input_close;
>>>>
>>>> +#ifdef CONFIG_LEDS_CLASS
>>>> +       priv->num_leds = cap->num_leds;
>>>> +       error = cap11xx_init_leds(dev, priv);
>>>> +       if (error)
>>>> +               return error;
>>>> +#endif
>>>>          input_set_drvdata(priv->idev, priv);
>>>>
>>>>          /*
>>>>
>>>
>>>
>>> --
>>> Best Regards,
>>> Jacek Anaszewski
>>
>>
>
>
> --
> Best Regards,
> Jacek Anaszewski
--
To unsubscribe from this list: send the line "unsubscribe devicetree" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html



[Index of Archives]     [Device Tree Compilter]     [Device Tree Spec]     [Linux Driver Backports]     [Video for Linux]     [Linux USB Devel]     [Linux PCI Devel]     [Linux Audio Users]     [Linux Kernel]     [Linux SCSI]     [XFree86]     [Yosemite Backpacking]
  Powered by Linux