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Date: Sun, 16 Jun 2019 18:56:52 +0200
From: Cezary Rojewski <cezary.rojewski@...el.com>
To: Fletcher Woodruff <fletcherw@...omium.org>
Cc: linux-kernel@...r.kernel.org, Ben Zhang <benzh@...omium.org>,
Jaroslav Kysela <perex@...ex.cz>,
Liam Girdwood <lgirdwood@...il.com>,
Mark Brown <broonie@...nel.org>,
Oder Chiou <oder_chiou@...ltek.com>,
Takashi Iwai <tiwai@...e.com>,
Curtis Malainey <cujomalainey@...omium.org>,
Ross Zwisler <zwisler@...omium.org>,
alsa-devel@...a-project.org
Subject: Re: [PATCH v7 3/4] ASoC: rt5677: clear interrupts by polarity flip
On 2019-06-14 21:48, Fletcher Woodruff wrote:
> From: Ben Zhang <benzh@...omium.org>
>
> The rt5677 jack detection function has a requirement that the polarity
> of an interrupt be flipped after it fires in order to clear the
> interrupt.
>
> This patch implements an irq_chip with irq_domain directly instead of
> using regmap-irq, so that interrupt source line polarities can be
> flipped in the irq handler.
>
> The reason that this patch does not add this feature within regmap-irq
> is that future patches will add hotword detection support to this irq
> handler. Those patches will require adding additional logic that would
> not make sense to have in regmap-irq.
>
> Signed-off-by: Ben Zhang <benzh@...omium.org>
> Signed-off-by: Fletcher Woodruff <fletcherw@...omium.org>
> ---
> sound/soc/codecs/rt5677.c | 170 ++++++++++++++++++++++++++++++--------
> sound/soc/codecs/rt5677.h | 7 +-
> 2 files changed, 143 insertions(+), 34 deletions(-)
>
> diff --git a/sound/soc/codecs/rt5677.c b/sound/soc/codecs/rt5677.c
> index 87a92ba0d040b7..87466ee222ee59 100644
> --- a/sound/soc/codecs/rt5677.c
> +++ b/sound/soc/codecs/rt5677.c
> @@ -23,6 +23,10 @@
> #include <linux/firmware.h>
> #include <linux/of_device.h>
> #include <linux/property.h>
> +#include <linux/irq.h>
> +#include <linux/interrupt.h>
> +#include <linux/irqdomain.h>
> +#include <linux/workqueue.h>
> #include <sound/core.h>
> #include <sound/pcm.h>
> #include <sound/pcm_params.h>
> @@ -4620,7 +4624,6 @@ static void rt5677_gpio_config(struct rt5677_priv *rt5677, unsigned offset,
> static int rt5677_to_irq(struct gpio_chip *chip, unsigned offset)
> {
> struct rt5677_priv *rt5677 = gpiochip_get_data(chip);
> - struct regmap_irq_chip_data *data = rt5677->irq_data;
> int irq;
>
> if ((rt5677->pdata.jd1_gpio == 1 && offset == RT5677_GPIO1) ||
> @@ -4646,7 +4649,7 @@ static int rt5677_to_irq(struct gpio_chip *chip, unsigned offset)
> return -ENXIO;
> }
>
> - return regmap_irq_get_virq(data, irq);
> + return irq_create_mapping(rt5677->domain, irq);
> }
>
> static const struct gpio_chip rt5677_template_chip = {
> @@ -5042,30 +5045,130 @@ static void rt5677_read_device_properties(struct rt5677_priv *rt5677,
> rt5677->pdata.jd3_gpio = val;
> }
>
> -static struct regmap_irq rt5677_irqs[] = {
> +struct rt5677_irq_desc {
> + unsigned int enable_mask;
> + unsigned int status_mask;
> + unsigned int polarity_mask;
> +};
> +
> +static const struct rt5677_irq_desc rt5677_irq_descs[] = {
> [RT5677_IRQ_JD1] = {
> - .reg_offset = 0,
> - .mask = RT5677_EN_IRQ_GPIO_JD1,
> + .enable_mask = RT5677_EN_IRQ_GPIO_JD1,
> + .status_mask = RT5677_STA_GPIO_JD1,
> + .polarity_mask = RT5677_INV_GPIO_JD1,
> },
> [RT5677_IRQ_JD2] = {
> - .reg_offset = 0,
> - .mask = RT5677_EN_IRQ_GPIO_JD2,
> + .enable_mask = RT5677_EN_IRQ_GPIO_JD2,
> + .status_mask = RT5677_STA_GPIO_JD2,
> + .polarity_mask = RT5677_INV_GPIO_JD2,
> },
> [RT5677_IRQ_JD3] = {
> - .reg_offset = 0,
> - .mask = RT5677_EN_IRQ_GPIO_JD3,
> + .enable_mask = RT5677_EN_IRQ_GPIO_JD3,
> + .status_mask = RT5677_STA_GPIO_JD3,
> + .polarity_mask = RT5677_INV_GPIO_JD3,
> },
> };
>
> -static struct regmap_irq_chip rt5677_irq_chip = {
> - .name = RT5677_DRV_NAME,
> - .irqs = rt5677_irqs,
> - .num_irqs = ARRAY_SIZE(rt5677_irqs),
> +static irqreturn_t rt5677_irq(int unused, void *data)
> +{
> + struct rt5677_priv *rt5677 = data;
> + int ret = 0, i, reg_irq, virq;
> + bool irq_fired = false;
> +
> + mutex_lock(&rt5677->irq_lock);
> + /* Read interrupt status */
> + ret = regmap_read(rt5677->regmap, RT5677_IRQ_CTRL1, ®_irq);
> + if (ret) {
> + pr_err("rt5677: failed reading IRQ status: %d\n", ret);
The entire rt5677 makes use of dev_XXX with the exception of.. this very
function. Consider reusing "component" field which is already part of
struct rt5677_priv and removing pr_XXX.
> + goto exit;
> + }
> +
> + for (i = 0; i < RT5677_IRQ_NUM; i++) {
> + if (reg_irq & rt5677_irq_descs[i].status_mask) {
> + irq_fired = true;
> + virq = irq_find_mapping(rt5677->domain, i);
> + if (virq)
> + handle_nested_irq(virq);
> +
> + /* Clear the interrupt by flipping the polarity of the
> + * interrupt source line that fired
> + */
> + reg_irq ^= rt5677_irq_descs[i].polarity_mask;
> + }
> + }
> +
> + if (!irq_fired)
> + goto exit;
> +
> + ret = regmap_write(rt5677->regmap, RT5677_IRQ_CTRL1, reg_irq);
> + if (ret) {
> + pr_err("rt5677: failed updating IRQ status: %d\n", ret);
Same here.
> + goto exit;
> + }
> +exit:
> + mutex_unlock(&rt5677->irq_lock);
> + if (irq_fired)
> + return IRQ_HANDLED;
> + else
> + return IRQ_NONE;
> +}
>
> - .num_regs = 1,
> - .status_base = RT5677_IRQ_CTRL1,
> - .mask_base = RT5677_IRQ_CTRL1,
> - .mask_invert = 1,
> +static void rt5677_irq_bus_lock(struct irq_data *data)
> +{
> + struct rt5677_priv *rt5677 = irq_data_get_irq_chip_data(data);
> +
> + mutex_lock(&rt5677->irq_lock);
> +}
> +
> +static void rt5677_irq_bus_sync_unlock(struct irq_data *data)
> +{
> + struct rt5677_priv *rt5677 = irq_data_get_irq_chip_data(data);
> +
> + // Set the enable/disable bits for the jack detect IRQs.
> + regmap_update_bits(rt5677->regmap, RT5677_IRQ_CTRL1,
> + RT5677_EN_IRQ_GPIO_JD1 | RT5677_EN_IRQ_GPIO_JD2 |
> + RT5677_EN_IRQ_GPIO_JD3, rt5677->irq_en);
> + mutex_unlock(&rt5677->irq_lock);
> +}
> +
> +static void rt5677_irq_enable(struct irq_data *data)
> +{
> + struct rt5677_priv *rt5677 = irq_data_get_irq_chip_data(data);
> +
> + rt5677->irq_en |= rt5677_irq_descs[data->hwirq].enable_mask;
> +}
> +
> +static void rt5677_irq_disable(struct irq_data *data)
> +{
> + struct rt5677_priv *rt5677 = irq_data_get_irq_chip_data(data);
> +
> + rt5677->irq_en &= ~rt5677_irq_descs[data->hwirq].enable_mask;
> +}
> +
> +static struct irq_chip rt5677_irq_chip = {
> + .name = "rt5677_irq_chip",
> + .irq_bus_lock = rt5677_irq_bus_lock,
> + .irq_bus_sync_unlock = rt5677_irq_bus_sync_unlock,
> + .irq_disable = rt5677_irq_disable,
> + .irq_enable = rt5677_irq_enable,
> +};
> +
> +static int rt5677_irq_map(struct irq_domain *h, unsigned int virq,
> + irq_hw_number_t hw)
> +{
> + struct rt5677_priv *rt5677 = h->host_data;
> +
> + irq_set_chip_data(virq, rt5677);
> + irq_set_chip(virq, &rt5677_irq_chip);
> + irq_set_nested_thread(virq, 1);
> + irq_set_noprobe(virq);
> + return 0;
> +}
> +
> +
> +static const struct irq_domain_ops rt5677_domain_ops = {
> + .map = rt5677_irq_map,
> + .xlate = irq_domain_xlate_twocell,
> };
>
> static int rt5677_init_irq(struct i2c_client *i2c)
> @@ -5084,6 +5187,8 @@ static int rt5677_init_irq(struct i2c_client *i2c)
> return -EINVAL;
> }
>
> + mutex_init(&rt5677->irq_lock);
> +
> /*
> * Select RC as the debounce clock so that GPIO works even when
> * MCLK is gated which happens when there is no audio stream
> @@ -5092,7 +5197,6 @@ static int rt5677_init_irq(struct i2c_client *i2c)
> regmap_update_bits(rt5677->regmap, RT5677_DIG_MISC,
> RT5677_IRQ_DEBOUNCE_SEL_MASK,
> RT5677_IRQ_DEBOUNCE_SEL_RC);
> -
> /* Enable auto power on RC when GPIO states are changed */
> regmap_update_bits(rt5677->regmap, RT5677_GEN_CTRL1, 0xff, 0xff);
>
> @@ -5115,26 +5219,25 @@ static int rt5677_init_irq(struct i2c_client *i2c)
> regmap_update_bits(rt5677->regmap, RT5677_GPIO_CTRL1,
> RT5677_GPIO1_PIN_MASK, RT5677_GPIO1_PIN_IRQ);
>
> - ret = regmap_add_irq_chip(rt5677->regmap, i2c->irq,
> - IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING | IRQF_ONESHOT, 0,
> - &rt5677_irq_chip, &rt5677->irq_data);
> + /* Ready to listen for interrupts */
> + rt5677->domain = irq_domain_add_linear(i2c->dev.of_node,
> + RT5677_IRQ_NUM, &rt5677_domain_ops, rt5677);
> + if (!rt5677->domain) {
> + dev_err(&i2c->dev, "Failed to create IRQ domain\n");
> + return -ENOMEM;
> + }
>
> - if (ret != 0) {
> - dev_err(&i2c->dev, "Failed to register IRQ chip: %d\n", ret);
> + ret = devm_request_threaded_irq(&i2c->dev, i2c->irq, NULL, rt5677_irq,
> + IRQF_TRIGGER_RISING | IRQF_ONESHOT,
> + "rt5677", rt5677);
> + if (ret) {
> + dev_err(&i2c->dev, "Failed to request IRQ: %d\n", ret);
> return ret;
You may want to simplify this, similarly to how's it done in your
rt5677_i2c_probe - leave message alone and return "ret" explicitly at
the end.
> }
>
> return 0;
> }
>
> -static void rt5677_free_irq(struct i2c_client *i2c)
> -{
> - struct rt5677_priv *rt5677 = i2c_get_clientdata(i2c);
> -
> - if (rt5677->irq_data)
> - regmap_del_irq_chip(i2c->irq, rt5677->irq_data);
> -}
> -
> static int rt5677_i2c_probe(struct i2c_client *i2c)
> {
> struct rt5677_priv *rt5677;
> @@ -5259,7 +5362,9 @@ static int rt5677_i2c_probe(struct i2c_client *i2c)
> RT5677_MICBIAS1_CTRL_VDD_3_3V);
>
> rt5677_init_gpio(i2c);
> - rt5677_init_irq(i2c);
> + ret = rt5677_init_irq(i2c);
> + if (ret)
> + dev_err(&i2c->dev, "Failed to initialize irq: %d\n", ret);
>
> return devm_snd_soc_register_component(&i2c->dev,
> &soc_component_dev_rt5677,
> @@ -5268,7 +5373,6 @@ static int rt5677_i2c_probe(struct i2c_client *i2c)
>
> static int rt5677_i2c_remove(struct i2c_client *i2c)
> {
> - rt5677_free_irq(i2c);
> rt5677_free_gpio(i2c);
>
> return 0;
> diff --git a/sound/soc/codecs/rt5677.h b/sound/soc/codecs/rt5677.h
> index c26edd387e340b..d0ac26e562eb5f 100644
> --- a/sound/soc/codecs/rt5677.h
> +++ b/sound/soc/codecs/rt5677.h
> @@ -1749,6 +1749,7 @@ enum {
> RT5677_IRQ_JD1,
> RT5677_IRQ_JD2,
> RT5677_IRQ_JD3,
> + RT5677_IRQ_NUM,
> };
>
> enum rt5677_type {
> @@ -1847,9 +1848,13 @@ struct rt5677_priv {
> struct gpio_chip gpio_chip;
> #endif
> bool dsp_vad_en;
> - struct regmap_irq_chip_data *irq_data;
> bool is_dsp_mode;
> bool is_vref_slow;
> +
> + /* Interrupt handling */
> + struct irq_domain *domain;
> + struct mutex irq_lock;
> + unsigned int irq_en;
> };
>
> int rt5677_sel_asrc_clk_src(struct snd_soc_component *component,
>
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