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pinctrl: sx150x: Convert to immutable irq_chip 

Convert the driver to immutable irq-chip with a bit of
intuition.

I switched to consistently using irqd_to_hwirq() consistently
while we are at it.

As the driver now needs to get the gpio_chip in the .irq_mask
and .irq_unmask callbacks, I switched to a pattern where we
first fetch the gpio_chip and then the state container from
that in two steps. The compiler will do the same thing anyway.

Cc: Marc Zyngier <maz@kernel.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Link: https://lore.kernel.org/r/20230403-immutable-irqchips-v1-9-503788a7f6e6@linaro.org
This commit is contained in:
Linus Walleij 2023-04-04 11:43:11 +02:00
parent 7341944c78
commit df60325839
1 changed files with 37 additions and 27 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

64
drivers/pinctrl/pinctrl-sx150x.c
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@ -99,7 +99,6 @@ struct sx150x_pinctrl {
struct pinctrl_dev *pctldev;
struct pinctrl_desc pinctrl_desc;
struct gpio_chip gpio;
struct irq_chip irq_chip;
struct regmap *regmap;
struct {
u32 sense;
@ -487,19 +486,21 @@ static int sx150x_gpio_direction_output(struct gpio_chip *chip,
static void sx150x_irq_mask(struct irq_data *d)
{
struct sx150x_pinctrl *pctl =
gpiochip_get_data(irq_data_get_irq_chip_data(d));
unsigned int n = d->hwirq;
struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
struct sx150x_pinctrl *pctl = gpiochip_get_data(gc);
unsigned int n = irqd_to_hwirq(d);
pctl->irq.masked |= BIT(n);
gpiochip_disable_irq(gc, n);
}
static void sx150x_irq_unmask(struct irq_data *d)
{
struct sx150x_pinctrl *pctl =
gpiochip_get_data(irq_data_get_irq_chip_data(d));
unsigned int n = d->hwirq;
struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
struct sx150x_pinctrl *pctl = gpiochip_get_data(gc);
unsigned int n = irqd_to_hwirq(d);
gpiochip_enable_irq(gc, n);
pctl->irq.masked &= ~BIT(n);
}
@ -520,14 +521,14 @@ static void sx150x_irq_set_sense(struct sx150x_pinctrl *pctl,
static int sx150x_irq_set_type(struct irq_data *d, unsigned int flow_type)
{
struct sx150x_pinctrl *pctl =
gpiochip_get_data(irq_data_get_irq_chip_data(d));
struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
struct sx150x_pinctrl *pctl = gpiochip_get_data(gc);
unsigned int n, val = 0;
if (flow_type & (IRQ_TYPE_LEVEL_HIGH | IRQ_TYPE_LEVEL_LOW))
return -EINVAL;
n = d->hwirq;
n = irqd_to_hwirq(d);
if (flow_type & IRQ_TYPE_EDGE_RISING)
val |= SX150X_IRQ_TYPE_EDGE_RISING;
@ -562,22 +563,42 @@ static irqreturn_t sx150x_irq_thread_fn(int irq, void *dev_id)
static void sx150x_irq_bus_lock(struct irq_data *d)
{
struct sx150x_pinctrl *pctl =
gpiochip_get_data(irq_data_get_irq_chip_data(d));
struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
struct sx150x_pinctrl *pctl = gpiochip_get_data(gc);
mutex_lock(&pctl->lock);
}
static void sx150x_irq_bus_sync_unlock(struct irq_data *d)
{
struct sx150x_pinctrl *pctl =
gpiochip_get_data(irq_data_get_irq_chip_data(d));
struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
struct sx150x_pinctrl *pctl = gpiochip_get_data(gc);
regmap_write(pctl->regmap, pctl->data->reg_irq_mask, pctl->irq.masked);
regmap_write(pctl->regmap, pctl->data->reg_sense, pctl->irq.sense);
mutex_unlock(&pctl->lock);
}
static void sx150x_irq_print_chip(struct irq_data *d, struct seq_file *p)
{
struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
struct sx150x_pinctrl *pctl = gpiochip_get_data(gc);
seq_printf(p, pctl->client->name);
}
static const struct irq_chip sx150x_irq_chip = {
.irq_mask = sx150x_irq_mask,
.irq_unmask = sx150x_irq_unmask,
.irq_set_type = sx150x_irq_set_type,
.irq_bus_lock = sx150x_irq_bus_lock,
.irq_bus_sync_unlock = sx150x_irq_bus_sync_unlock,
.irq_print_chip = sx150x_irq_print_chip,
.flags = IRQCHIP_IMMUTABLE,
GPIOCHIP_IRQ_RESOURCE_HELPERS,
};
static int sx150x_pinconf_get(struct pinctrl_dev *pctldev, unsigned int pin,
unsigned long *config)
{
@ -1181,19 +1202,8 @@ static int sx150x_probe(struct i2c_client *client)
if (client->irq > 0) {
struct gpio_irq_chip *girq;
pctl->irq_chip.irq_mask = sx150x_irq_mask;
pctl->irq_chip.irq_unmask = sx150x_irq_unmask;
pctl->irq_chip.irq_set_type = sx150x_irq_set_type;
pctl->irq_chip.irq_bus_lock = sx150x_irq_bus_lock;
pctl->irq_chip.irq_bus_sync_unlock = sx150x_irq_bus_sync_unlock;
pctl->irq_chip.name = devm_kstrdup(dev, client->name,
GFP_KERNEL);
if (!pctl->irq_chip.name)
return -ENOMEM;
pctl->irq.masked = ~0;
pctl->irq.sense = 0;
/*
* Because sx150x_irq_threaded_fn invokes all of the
* nested interrupt handlers via handle_nested_irq,
@ -1206,7 +1216,7 @@ static int sx150x_probe(struct i2c_client *client)
* called (should not happen)
*/
girq = &pctl->gpio.irq;
girq->chip = &pctl->irq_chip;
gpio_irq_chip_set_chip(girq, &sx150x_irq_chip);
/* This will let us handle the parent IRQ in the driver */
girq->parent_handler = NULL;
girq->num_parents = 0;
@ -1219,7 +1229,7 @@ static int sx150x_probe(struct i2c_client *client)
sx150x_irq_thread_fn,
IRQF_ONESHOT | IRQF_SHARED |
IRQF_TRIGGER_FALLING,
pctl->irq_chip.name, pctl);
client->name, pctl);
if (ret < 0)
return ret;
}