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- // SPDX-License-Identifier: GPL-2.0-only
- /*
- * Generic GPIO card-detect helper
- *
- * Copyright (C) 2011, Guennadi Liakhovetski <g.liakhovetski@gmx.de>
- */
- #include <linux/err.h>
- #include <linux/gpio/consumer.h>
- #include <linux/interrupt.h>
- #include <linux/jiffies.h>
- #include <linux/mmc/host.h>
- #include <linux/mmc/slot-gpio.h>
- #include <linux/module.h>
- #include <linux/slab.h>
- #include <trace/hooks/mmc_core.h>
- #include "slot-gpio.h"
- struct mmc_gpio {
- struct gpio_desc *ro_gpio;
- struct gpio_desc *cd_gpio;
- irqreturn_t (*cd_gpio_isr)(int irq, void *dev_id);
- char *ro_label;
- char *cd_label;
- u32 cd_debounce_delay_ms;
- };
- static irqreturn_t mmc_gpio_cd_irqt(int irq, void *dev_id)
- {
- /* Schedule a card detection after a debounce timeout */
- struct mmc_host *host = dev_id;
- struct mmc_gpio *ctx = host->slot.handler_priv;
- bool allow = true;
- trace_android_vh_mmc_gpio_cd_irqt(host, &allow);
- if (!allow)
- return IRQ_HANDLED;
- host->trigger_card_event = true;
- mmc_detect_change(host, msecs_to_jiffies(ctx->cd_debounce_delay_ms));
- return IRQ_HANDLED;
- }
- int mmc_gpio_alloc(struct mmc_host *host)
- {
- struct mmc_gpio *ctx = devm_kzalloc(host->parent,
- sizeof(*ctx), GFP_KERNEL);
- if (ctx) {
- ctx->cd_debounce_delay_ms = 200;
- ctx->cd_label = devm_kasprintf(host->parent, GFP_KERNEL,
- "%s cd", dev_name(host->parent));
- if (!ctx->cd_label)
- return -ENOMEM;
- ctx->ro_label = devm_kasprintf(host->parent, GFP_KERNEL,
- "%s ro", dev_name(host->parent));
- if (!ctx->ro_label)
- return -ENOMEM;
- host->slot.handler_priv = ctx;
- host->slot.cd_irq = -EINVAL;
- }
- return ctx ? 0 : -ENOMEM;
- }
- int mmc_gpio_get_ro(struct mmc_host *host)
- {
- struct mmc_gpio *ctx = host->slot.handler_priv;
- if (!ctx || !ctx->ro_gpio)
- return -ENOSYS;
- return gpiod_get_value_cansleep(ctx->ro_gpio);
- }
- EXPORT_SYMBOL(mmc_gpio_get_ro);
- int mmc_gpio_get_cd(struct mmc_host *host)
- {
- struct mmc_gpio *ctx = host->slot.handler_priv;
- int cansleep;
- if (!ctx || !ctx->cd_gpio)
- return -ENOSYS;
- cansleep = gpiod_cansleep(ctx->cd_gpio);
- return cansleep ?
- gpiod_get_value_cansleep(ctx->cd_gpio) :
- gpiod_get_value(ctx->cd_gpio);
- }
- EXPORT_SYMBOL(mmc_gpio_get_cd);
- void mmc_gpiod_request_cd_irq(struct mmc_host *host)
- {
- struct mmc_gpio *ctx = host->slot.handler_priv;
- int irq = -EINVAL;
- int ret;
- if (host->slot.cd_irq >= 0 || !ctx || !ctx->cd_gpio)
- return;
- /*
- * Do not use IRQ if the platform prefers to poll, e.g., because that
- * IRQ number is already used by another unit and cannot be shared.
- */
- if (!(host->caps & MMC_CAP_NEEDS_POLL))
- irq = gpiod_to_irq(ctx->cd_gpio);
- if (irq >= 0) {
- if (!ctx->cd_gpio_isr)
- ctx->cd_gpio_isr = mmc_gpio_cd_irqt;
- ret = devm_request_threaded_irq(host->parent, irq,
- NULL, ctx->cd_gpio_isr,
- IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
- ctx->cd_label, host);
- if (ret < 0)
- irq = ret;
- }
- host->slot.cd_irq = irq;
- if (irq < 0)
- host->caps |= MMC_CAP_NEEDS_POLL;
- }
- EXPORT_SYMBOL(mmc_gpiod_request_cd_irq);
- int mmc_gpio_set_cd_wake(struct mmc_host *host, bool on)
- {
- int ret = 0;
- if (!(host->caps & MMC_CAP_CD_WAKE) ||
- host->slot.cd_irq < 0 ||
- on == host->slot.cd_wake_enabled)
- return 0;
- if (on) {
- ret = enable_irq_wake(host->slot.cd_irq);
- host->slot.cd_wake_enabled = !ret;
- } else {
- disable_irq_wake(host->slot.cd_irq);
- host->slot.cd_wake_enabled = false;
- }
- return ret;
- }
- EXPORT_SYMBOL(mmc_gpio_set_cd_wake);
- /* Register an alternate interrupt service routine for
- * the card-detect GPIO.
- */
- void mmc_gpio_set_cd_isr(struct mmc_host *host,
- irqreturn_t (*isr)(int irq, void *dev_id))
- {
- struct mmc_gpio *ctx = host->slot.handler_priv;
- WARN_ON(ctx->cd_gpio_isr);
- ctx->cd_gpio_isr = isr;
- }
- EXPORT_SYMBOL(mmc_gpio_set_cd_isr);
- /**
- * mmc_gpiod_request_cd - request a gpio descriptor for card-detection
- * @host: mmc host
- * @con_id: function within the GPIO consumer
- * @idx: index of the GPIO to obtain in the consumer
- * @override_active_level: ignore %GPIO_ACTIVE_LOW flag
- * @debounce: debounce time in microseconds
- *
- * Note that this must be called prior to mmc_add_host()
- * otherwise the caller must also call mmc_gpiod_request_cd_irq().
- *
- * Returns zero on success, else an error.
- */
- int mmc_gpiod_request_cd(struct mmc_host *host, const char *con_id,
- unsigned int idx, bool override_active_level,
- unsigned int debounce)
- {
- struct mmc_gpio *ctx = host->slot.handler_priv;
- struct gpio_desc *desc;
- int ret;
- desc = devm_gpiod_get_index(host->parent, con_id, idx, GPIOD_IN);
- if (IS_ERR(desc))
- return PTR_ERR(desc);
- if (debounce) {
- ret = gpiod_set_debounce(desc, debounce);
- if (ret < 0)
- ctx->cd_debounce_delay_ms = debounce / 1000;
- }
- /* override forces default (active-low) polarity ... */
- if (override_active_level && !gpiod_is_active_low(desc))
- gpiod_toggle_active_low(desc);
- /* ... or active-high */
- if (host->caps2 & MMC_CAP2_CD_ACTIVE_HIGH)
- gpiod_toggle_active_low(desc);
- ctx->cd_gpio = desc;
- return 0;
- }
- EXPORT_SYMBOL(mmc_gpiod_request_cd);
- bool mmc_can_gpio_cd(struct mmc_host *host)
- {
- struct mmc_gpio *ctx = host->slot.handler_priv;
- return ctx->cd_gpio ? true : false;
- }
- EXPORT_SYMBOL(mmc_can_gpio_cd);
- /**
- * mmc_gpiod_request_ro - request a gpio descriptor for write protection
- * @host: mmc host
- * @con_id: function within the GPIO consumer
- * @idx: index of the GPIO to obtain in the consumer
- * @debounce: debounce time in microseconds
- *
- * Returns zero on success, else an error.
- */
- int mmc_gpiod_request_ro(struct mmc_host *host, const char *con_id,
- unsigned int idx, unsigned int debounce)
- {
- struct mmc_gpio *ctx = host->slot.handler_priv;
- struct gpio_desc *desc;
- int ret;
- desc = devm_gpiod_get_index(host->parent, con_id, idx, GPIOD_IN);
- if (IS_ERR(desc))
- return PTR_ERR(desc);
- if (debounce) {
- ret = gpiod_set_debounce(desc, debounce);
- if (ret < 0)
- return ret;
- }
- if (host->caps2 & MMC_CAP2_RO_ACTIVE_HIGH)
- gpiod_toggle_active_low(desc);
- ctx->ro_gpio = desc;
- return 0;
- }
- EXPORT_SYMBOL(mmc_gpiod_request_ro);
- bool mmc_can_gpio_ro(struct mmc_host *host)
- {
- struct mmc_gpio *ctx = host->slot.handler_priv;
- return ctx->ro_gpio ? true : false;
- }
- EXPORT_SYMBOL(mmc_can_gpio_ro);
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