[PATCH 3/3] ASoC: tlv320aic3x: switch to using gpiod API

Dmitry Torokhov
2022-11-02T23:25:22Z

Switch the driver from legacy gpio API that is deprecated to the newer
gpiod API that respects line polarities described in ACPI/DT.

The driver still tries to support shared reset lines, by first trying to
allocate the reset GPIO normally, and then non-exclusively, although the
utility of such support is questionable, toggling reset line from one
driver/instance will result in all chips being reset, potentially at an
inopportune moment.

Note that this change depends on commit fbbbcd177a27 ("gpiolib: of: add
quirk for locating reset lines with legacy bindings") to translate
request for "reset" GPIO to the legacy name "gpio-reset" in case when
proper name is not used.

Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
---
sound/soc/codecs/tlv320aic3x.c | 108 ++++++++++++---------------------
1 file changed, 39 insertions(+), 69 deletions(-)

diff --git a/sound/soc/codecs/tlv320aic3x.c b/sound/soc/codecs/tlv320aic3x.c
index 9b2bb99cc165..56e795a00e22 100644
--- a/sound/soc/codecs/tlv320aic3x.c
+++ b/sound/soc/codecs/tlv320aic3x.c
@@ -32,12 +32,12 @@
#include <linux/moduleparam.h>
#include <linux/init.h>
#include <linux/delay.h>
+#include <linux/err.h>
#include <linux/pm.h>
#include <linux/i2c.h>
-#include <linux/gpio.h>
+#include <linux/gpio/consumer.h>
#include <linux/regulator/consumer.h>
#include <linux/of.h>
-#include <linux/of_gpio.h>
#include <linux/slab.h>
#include <sound/core.h>
#include <sound/pcm.h>
@@ -56,8 +56,6 @@ static const char *aic3x_supply_names[AIC3X_NUM_SUPPLIES] = {
"DRVDD", /* ADC Analog and Output Driver Voltage */
};

-static LIST_HEAD(reset_list);
-
struct aic3x_priv;

struct aic3x_disable_nb {
@@ -80,9 +78,9 @@ struct aic3x_priv {
unsigned int dai_fmt;
unsigned int tdm_delay;
unsigned int slot_width;
- struct list_head list;
int master;
- int gpio_reset;
+ struct gpio_desc *gpio_reset;
+ bool shared_reset;
int power;
u16 model;

@@ -1369,8 +1367,8 @@ static int aic3x_regulator_event(struct notifier_block *nb,
* Put codec to reset and require cache sync as at least one
* of the supplies was disabled
*/
- if (gpio_is_valid(aic3x->gpio_reset))
- gpio_set_value(aic3x->gpio_reset, 0);
+ if (aic3x->gpio_reset)
+ gpiod_set_value(aic3x->gpio_reset, 1);
regcache_mark_dirty(aic3x->regmap);
}

@@ -1390,9 +1388,9 @@ static int aic3x_set_power(struct snd_soc_component *component, int power)
goto out;
aic3x->power = 1;

- if (gpio_is_valid(aic3x->gpio_reset)) {
+ if (aic3x->gpio_reset) {
udelay(1);
- gpio_set_value(aic3x->gpio_reset, 1);
+ gpiod_set_value(aic3x->gpio_reset, 0);
}

/* Sync reg_cache with the hardware */
@@ -1598,19 +1596,6 @@ static int aic3x_init(struct snd_soc_component *component)
return 0;
}

-static bool aic3x_is_shared_reset(struct aic3x_priv *aic3x)
-{
- struct aic3x_priv *a;
-
- list_for_each_entry(a, &reset_list, list) {
- if (gpio_is_valid(aic3x->gpio_reset) &&
- aic3x->gpio_reset == a->gpio_reset)
- return true;
- }
-
- return false;
-}
-
static int aic3x_component_probe(struct snd_soc_component *component)
{
struct aic3x_priv *aic3x = snd_soc_component_get_drvdata(component);
@@ -1775,19 +1760,6 @@ int aic3x_probe(struct device *dev, struct regmap *regmap, kernel_ulong_t driver
if (!ai3x_setup)
return -ENOMEM;

- ret = of_get_named_gpio(np, "reset-gpios", 0);
- if (ret >= 0) {
- aic3x->gpio_reset = ret;
- } else {
- ret = of_get_named_gpio(np, "gpio-reset", 0);
- if (ret > 0) {
- dev_warn(dev, "Using deprecated property \"gpio-reset\", please update your DT");
- aic3x->gpio_reset = ret;
- } else {
- aic3x->gpio_reset = -1;
- }
- }
-
if (of_property_read_u32_array(np, "ai3x-gpio-func",
ai3x_setup->gpio_func, 2) >= 0) {
aic3x->setup = ai3x_setup;
@@ -1812,29 +1784,43 @@ int aic3x_probe(struct device *dev, struct regmap *regmap, kernel_ulong_t driver
} else {
aic3x->micbias_vg = AIC3X_MICBIAS_OFF;
}
-
- } else {
- aic3x->gpio_reset = -1;
}

aic3x->model = driver_data;

- if (gpio_is_valid(aic3x->gpio_reset) &&
- !aic3x_is_shared_reset(aic3x)) {
- ret = gpio_request(aic3x->gpio_reset, "tlv320aic3x reset");
- if (ret != 0)
- goto err;
- gpio_direction_output(aic3x->gpio_reset, 0);
+ aic3x->gpio_reset = devm_gpiod_get_optional(dev, "reset",
+ GPIOD_OUT_HIGH);
+ ret = PTR_ERR_OR_ZERO(aic3x->gpio_reset);
+ if (ret) {
+ if (ret != -EBUSY)
+ return ret;
+
+ /*
+ * Apparently there are setups where the codec is sharing
+ * its reset line. Try to get it non-exclusively, although
+ * the utility of this is unclear: how do we make sure that
+ * resetting one chip will not disturb the others that share
+ * the same line?
+ */
+ aic3x->gpio_reset = devm_gpiod_get(dev, "reset",
+ GPIOD_ASIS | GPIOD_FLAGS_BIT_NONEXCLUSIVE);
+ ret = PTR_ERR_OR_ZERO(aic3x->gpio_reset);
+ if (ret)
+ return ret;
+
+ aic3x->shared_reset = true;
}

+ gpiod_set_consumer_name(aic3x->gpio_reset, "tlv320aic3x reset");
+
for (i = 0; i < ARRAY_SIZE(aic3x->supplies); i++)
aic3x->supplies[i].supply = aic3x_supply_names[i];

ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(aic3x->supplies),
aic3x->supplies);
- if (ret != 0) {
+ if (ret) {
dev_err(dev, "Failed to request supplies: %d\n", ret);
- goto err_gpio;
+ return ret;
}

aic3x_configure_ocmv(dev, aic3x);
@@ -1843,26 +1829,14 @@ int aic3x_probe(struct device *dev, struct regmap *regmap, kernel_ulong_t driver
ret = regmap_register_patch(aic3x->regmap, aic3007_class_d,
ARRAY_SIZE(aic3007_class_d));
if (ret != 0)
- dev_err(dev, "Failed to init class D: %d\n",
- ret);
+ dev_err(dev, "Failed to init class D: %d\n", ret);
}

ret = devm_snd_soc_register_component(dev, &soc_component_dev_aic3x, &aic3x_dai, 1);
-
- if (ret != 0)
- goto err_gpio;
-
- INIT_LIST_HEAD(&aic3x->list);
- list_add(&aic3x->list, &reset_list);
+ if (ret)
+ return ret;

return 0;
-
-err_gpio:
- if (gpio_is_valid(aic3x->gpio_reset) &&
- !aic3x_is_shared_reset(aic3x))
- gpio_free(aic3x->gpio_reset);
-err:
- return ret;
}
EXPORT_SYMBOL(aic3x_probe);

@@ -1870,13 +1844,9 @@ void aic3x_remove(struct device *dev)
{
struct aic3x_priv *aic3x = dev_get_drvdata(dev);

- list_del(&aic3x->list);
-
- if (gpio_is_valid(aic3x->gpio_reset) &&
- !aic3x_is_shared_reset(aic3x)) {
- gpio_set_value(aic3x->gpio_reset, 0);
- gpio_free(aic3x->gpio_reset);
- }
+ /* Leave the codec in reset state */
+ if (aic3x->gpio_reset && !aic3x->shared_reset)
+ gpiod_set_value(aic3x->gpio_reset, 1);
}
EXPORT_SYMBOL(aic3x_remove);

--
2.38.1.273.g43a17bfeac-goog