drivers/pinctrl/aspeed/pinctrl-aspeed.c

Source file repositories/reference/linux-study-clean/drivers/pinctrl/aspeed/pinctrl-aspeed.c

File Facts

System
Linux kernel
Corpus path
drivers/pinctrl/aspeed/pinctrl-aspeed.c
Extension
.c
Size
15978 bytes
Lines
660
Domain
Driver Families
Bucket
drivers/pinctrl
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

while ((expr = *funcs)) {
			const char *str = get(expr);
			size_t delta = strlen(str) + 2;
			char *expanded;

			expanded = krealloc(found, len + delta + 1, GFP_KERNEL);
			if (!expanded) {
				kfree(found);
				return expanded;
			}

			found = expanded;
			found[len] = '\0';
			len += delta;

			strcat(found, str);
			strcat(found, ", ");

			funcs++;
		}
		prios++;
	}

	if (len < 2) {
		kfree(found);
		return NULL;
	}

	found[len - 2] = '\0';

	return found;
}

static const char *aspeed_sig_expr_function(const struct aspeed_sig_expr *expr)
{
	return expr->function;
}

static char *get_defined_functions(const struct aspeed_pin_desc *pdesc)
{
	return get_defined_attribute(pdesc, aspeed_sig_expr_function);
}

static const char *aspeed_sig_expr_signal(const struct aspeed_sig_expr *expr)
{
	return expr->signal;
}

static char *get_defined_signals(const struct aspeed_pin_desc *pdesc)
{
	return get_defined_attribute(pdesc, aspeed_sig_expr_signal);
}

int aspeed_pinmux_set_mux(struct pinctrl_dev *pctldev, unsigned int function,
			  unsigned int group)
{
	int i;
	int ret;
	struct aspeed_pinctrl_data *pdata = pinctrl_dev_get_drvdata(pctldev);
	const struct aspeed_pin_group *pgroup = &pdata->pinmux.groups[group];
	const struct aspeed_pin_function *pfunc =
		&pdata->pinmux.functions[function];

	for (i = 0; i < pgroup->npins; i++) {
		int pin = pgroup->pins[i];
		const struct aspeed_pin_desc *pdesc = pdata->pins[pin].drv_data;
		const struct aspeed_sig_expr *expr = NULL;
		const struct aspeed_sig_expr **funcs;
		const struct aspeed_sig_expr ***prios;

		if (!pdesc)
			return -EINVAL;

		pr_debug("Muxing pin %s for %s\n", pdesc->name, pfunc->name);

		prios = pdesc->prios;

		if (!prios)
			continue;

		/* Disable functions at a higher priority than that requested */
		while ((funcs = *prios)) {
			expr = aspeed_find_expr_by_name(funcs, pfunc->name);

			if (expr)
				break;

			ret = aspeed_disable_sig(&pdata->pinmux, funcs);
			if (ret)
				return ret;

Annotation

Implementation Notes