drivers/input/misc/arizona-haptics.c

Source file repositories/reference/linux-study-clean/drivers/input/misc/arizona-haptics.c

File Facts

System
Linux kernel
Corpus path
drivers/input/misc/arizona-haptics.c
Extension
.c
Size
5123 bytes
Lines
212
Domain
Driver Families
Bucket
drivers/input
Inferred role
Driver Families: implementation source
Status
source implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

struct arizona_haptics {
	struct arizona *arizona;
	struct input_dev *input_dev;
	struct work_struct work;

	struct mutex mutex;
	u8 intensity;
};

static void arizona_haptics_work(struct work_struct *work)
{
	struct arizona_haptics *haptics = container_of(work,
						       struct arizona_haptics,
						       work);
	struct arizona *arizona = haptics->arizona;
	int ret;

	if (!haptics->arizona->dapm) {
		dev_err(arizona->dev, "No DAPM context\n");
		return;
	}

	if (haptics->intensity) {
		ret = regmap_update_bits(arizona->regmap,
					 ARIZONA_HAPTICS_PHASE_2_INTENSITY,
					 ARIZONA_PHASE2_INTENSITY_MASK,
					 haptics->intensity);
		if (ret != 0) {
			dev_err(arizona->dev, "Failed to set intensity: %d\n",
				ret);
			return;
		}

		/* This enable sequence will be a noop if already enabled */
		ret = regmap_update_bits(arizona->regmap,
					 ARIZONA_HAPTICS_CONTROL_1,
					 ARIZONA_HAP_CTRL_MASK,
					 1 << ARIZONA_HAP_CTRL_SHIFT);
		if (ret != 0) {
			dev_err(arizona->dev, "Failed to start haptics: %d\n",
				ret);
			return;
		}

		ret = snd_soc_dapm_enable_pin(arizona->dapm, "HAPTICS");
		if (ret != 0) {
			dev_err(arizona->dev, "Failed to start HAPTICS: %d\n",
				ret);
			return;
		}

		ret = snd_soc_dapm_sync(arizona->dapm);
		if (ret != 0) {
			dev_err(arizona->dev, "Failed to sync DAPM: %d\n",
				ret);
			return;
		}
	} else {
		/* This disable sequence will be a noop if already enabled */
		ret = snd_soc_dapm_disable_pin(arizona->dapm, "HAPTICS");
		if (ret != 0) {
			dev_err(arizona->dev, "Failed to disable HAPTICS: %d\n",
				ret);
			return;
		}

		ret = snd_soc_dapm_sync(arizona->dapm);
		if (ret != 0) {
			dev_err(arizona->dev, "Failed to sync DAPM: %d\n",
				ret);
			return;
		}

		ret = regmap_update_bits(arizona->regmap,
					 ARIZONA_HAPTICS_CONTROL_1,
					 ARIZONA_HAP_CTRL_MASK, 0);
		if (ret != 0) {
			dev_err(arizona->dev, "Failed to stop haptics: %d\n",
				ret);
			return;
		}
	}
}

static int arizona_haptics_play(struct input_dev *input, void *data,
				struct ff_effect *effect)
{
	struct arizona_haptics *haptics = input_get_drvdata(input);
	struct arizona *arizona = haptics->arizona;

Annotation

Implementation Notes