On Tue, Jun 16, 2015 at 12:54 AM, Jacek Anaszewski
<j.anaszewski@xxxxxxxxxxx> wrote:
> On 06/16/2015 04:46 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 | 128
>> ++++++++++++++++++++++++++++++++++++++-
>> 1 file changed, 125 insertions(+), 3 deletions(-)
>>
>> diff --git a/drivers/input/keyboard/cap11xx.c
>> b/drivers/input/keyboard/cap11xx.c
>> index f07461a..fc8d365 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 +227,91 @@ 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;
>> +
>> + /*
>> + * All LEDs share the same duty cycle as this is a HW limitation.
>> + * Brightness levels per LED are either 0 (OFF) and 1 (ON).
>> + *
>> + * Actual brightness level for the ON state for all LEDS is set
>> via the
>> + * "linux,led-brightness" DT property.
>> + */
>> + regmap_update_bits(priv->regmap, CAP11XX_REG_LED_OUTPUT_CONTROL,
>> + BIT(led->reg), !!value ? BIT(led->reg) :
>> 0);
>
>
> You don't need '!!' before value. Any non-zero value is evaluated
> to true in conditions.
>
Ok old habit of mine. Will remove in v5
>
>> +}
>> +
>> +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", ®);
>> + if (error || reg == 0 || reg > CAP11XX_REG_LED_DUTY_MAX_VALUE)
>> + reg = CAP11XX_REG_LED_DUTY_MAX_VALUE;
>> +
>> + 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);
>> + 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;
>> + led->cdev.brightness_set = cap11xx_led_set;
>> + led->cdev.max_brightness = 1;
>> + led->cdev.brightness = LED_OFF;
>> +
>> + error = of_property_read_u32(child, "reg", ®);
>> + if (error != 0 || reg >= priv->num_leds)
>> + continue;
>> + led->reg = reg;
>> + led->priv = priv;
>> +
>> + INIT_WORK(&led->work, cap11xx_led_work);
>> + error = devm_led_classdev_register(dev, &led->cdev);
>> + if (error < 0)
>> + return -EINVAL;
>> +
>> + schedule_work(&led->work);
>
>
> Why do you schedule work here? It should be done only in brightness_set op.
>
The LED needs to be set to initial turned off state, since there is no
Power ON/OFF register for the cap11xx devices.. So LEDs state would be
persistent across warm reboots.
Thoughts on how to do this better?
>> + led++;
>> + };
>> +
>> + return 0;
>> +}
>> +#endif
>> +
>> static int cap11xx_i2c_probe(struct i2c_client *i2c_client,
>> const struct i2c_device_id *id)
>> {
>> @@ -316,6 +432,12 @@ 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
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