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.
- 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.
- Allocates kernel memory; connect allocation flags and lifetime to context constraints.
- Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.
Dependency Surface
linux/module.hlinux/platform_device.hlinux/input.hlinux/slab.hsound/soc.hsound/soc-dapm.hlinux/mfd/arizona/core.hlinux/mfd/arizona/pdata.hlinux/mfd/arizona/registers.h
Detected Declarations
struct arizona_hapticsfunction arizona_haptics_workfunction arizona_haptics_playfunction arizona_haptics_closefunction arizona_haptics_probe
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
- Immediate include surface: `linux/module.h`, `linux/platform_device.h`, `linux/input.h`, `linux/slab.h`, `sound/soc.h`, `sound/soc-dapm.h`, `linux/mfd/arizona/core.h`, `linux/mfd/arizona/pdata.h`.
- Detected declarations: `struct arizona_haptics`, `function arizona_haptics_work`, `function arizona_haptics_play`, `function arizona_haptics_close`, `function arizona_haptics_probe`.
- Atlas domain: Driver Families / drivers/input.
- Implementation status: source implementation candidate.
Implementation Notes
- This generated page is the file-by-file coverage layer; curated subsystem chapters should link here when they synthesize a multi-file control flow.
- Core OS pages should be promoted from atlas-only to deep-reviewed when they explain data structures, invariants, locking, lifecycle, and C implementation snippets.
- Driver-family pages are intentionally pattern-oriented unless they are part of the selected PCIe/NVMe representative device path.