drivers/nvmem/qcom-spmi-sdam.c
Source file repositories/reference/linux-study-clean/drivers/nvmem/qcom-spmi-sdam.c
File Facts
- System
- Linux kernel
- Corpus path
drivers/nvmem/qcom-spmi-sdam.c- Extension
.c- Size
- 4392 bytes
- Lines
- 184
- Domain
- Driver Families
- Bucket
- drivers/nvmem
- 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/device.hlinux/module.hlinux/of.hlinux/nvmem-provider.hlinux/platform_device.hlinux/regmap.h
Detected Declarations
struct sdam_chipfunction sdam_is_validfunction sdam_is_rofunction sdam_readfunction sdam_writefunction sdam_probe
Annotated Snippet
struct sdam_chip {
struct regmap *regmap;
struct nvmem_config sdam_config;
unsigned int base;
unsigned int size;
};
/* read only register offsets */
static const u8 sdam_ro_map[] = {
REGISTER_MAP_ID,
REGISTER_MAP_VERSION,
SDAM_SIZE
};
static bool sdam_is_valid(struct sdam_chip *sdam, unsigned int offset,
size_t len)
{
unsigned int sdam_mem_end = SDAM_MEM_START + sdam->size - 1;
if (!len)
return false;
if (offset >= SDAM_MEM_START && offset <= sdam_mem_end
&& (offset + len - 1) <= sdam_mem_end)
return true;
else if ((offset == SDAM_PBS_TRIG_SET || offset == SDAM_PBS_TRIG_CLR)
&& (len == 1))
return true;
return false;
}
static bool sdam_is_ro(unsigned int offset, size_t len)
{
int i;
for (i = 0; i < ARRAY_SIZE(sdam_ro_map); i++)
if (offset <= sdam_ro_map[i] && (offset + len) > sdam_ro_map[i])
return true;
return false;
}
static int sdam_read(void *priv, unsigned int offset, void *val,
size_t bytes)
{
struct sdam_chip *sdam = priv;
struct device *dev = sdam->sdam_config.dev;
int rc;
if (!sdam_is_valid(sdam, offset, bytes)) {
dev_err(dev, "Invalid SDAM offset %#x len=%zd\n",
offset, bytes);
return -EINVAL;
}
rc = regmap_bulk_read(sdam->regmap, sdam->base + offset, val, bytes);
if (rc < 0)
dev_err(dev, "Failed to read SDAM offset %#x len=%zd, rc=%d\n",
offset, bytes, rc);
return rc;
}
static int sdam_write(void *priv, unsigned int offset, void *val,
size_t bytes)
{
struct sdam_chip *sdam = priv;
struct device *dev = sdam->sdam_config.dev;
int rc;
if (!sdam_is_valid(sdam, offset, bytes)) {
dev_err(dev, "Invalid SDAM offset %#x len=%zd\n",
offset, bytes);
return -EINVAL;
}
if (sdam_is_ro(offset, bytes)) {
dev_err(dev, "Invalid write offset %#x len=%zd\n",
offset, bytes);
return -EINVAL;
}
rc = regmap_bulk_write(sdam->regmap, sdam->base + offset, val, bytes);
if (rc < 0)
dev_err(dev, "Failed to write SDAM offset %#x len=%zd, rc=%d\n",
offset, bytes, rc);
return rc;
}
Annotation
- Immediate include surface: `linux/device.h`, `linux/module.h`, `linux/of.h`, `linux/nvmem-provider.h`, `linux/platform_device.h`, `linux/regmap.h`.
- Detected declarations: `struct sdam_chip`, `function sdam_is_valid`, `function sdam_is_ro`, `function sdam_read`, `function sdam_write`, `function sdam_probe`.
- Atlas domain: Driver Families / drivers/nvmem.
- 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.