linux/drivers/mmc/core/slot-gpio.c
Andy Shevchenko c1ada71fb7 mmc: slot-gpio: Don't override con_id when request descriptor
The caller may supply connection ID, index, or both. All combinations are
possible and mmc framework should not make any assumption on what exactly
caller wants.

Remove con_id override conditionals in mmc_gpiod_request_ro() and
mmc_gpiod_request_cd().

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Adrian Hunter <adrian.hunter@intel.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
2017-02-13 13:20:06 +01:00

308 lines
7.9 KiB
C

/*
* Generic GPIO card-detect helper
*
* Copyright (C) 2011, Guennadi Liakhovetski <g.liakhovetski@gmx.de>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/err.h>
#include <linux/gpio.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 "slot-gpio.h"
struct mmc_gpio {
struct gpio_desc *ro_gpio;
struct gpio_desc *cd_gpio;
bool override_ro_active_level;
bool override_cd_active_level;
irqreturn_t (*cd_gpio_isr)(int irq, void *dev_id);
char *ro_label;
char cd_label[0];
};
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;
host->trigger_card_event = true;
mmc_detect_change(host, msecs_to_jiffies(200));
return IRQ_HANDLED;
}
int mmc_gpio_alloc(struct mmc_host *host)
{
size_t len = strlen(dev_name(host->parent)) + 4;
struct mmc_gpio *ctx = devm_kzalloc(host->parent,
sizeof(*ctx) + 2 * len, GFP_KERNEL);
if (ctx) {
ctx->ro_label = ctx->cd_label + len;
snprintf(ctx->cd_label, len, "%s cd", dev_name(host->parent));
snprintf(ctx->ro_label, len, "%s ro", dev_name(host->parent));
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;
if (ctx->override_ro_active_level)
return !gpiod_get_raw_value_cansleep(ctx->ro_gpio) ^
!!(host->caps2 & MMC_CAP2_RO_ACTIVE_HIGH);
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;
if (!ctx || !ctx->cd_gpio)
return -ENOSYS;
if (ctx->override_cd_active_level)
return !gpiod_get_raw_value_cansleep(ctx->cd_gpio) ^
!!(host->caps2 & MMC_CAP2_CD_ACTIVE_HIGH);
return gpiod_get_value_cansleep(ctx->cd_gpio);
}
EXPORT_SYMBOL(mmc_gpio_get_cd);
/**
* mmc_gpio_request_ro - request a gpio for write-protection
* @host: mmc host
* @gpio: gpio number requested
*
* As devm_* managed functions are used in mmc_gpio_request_ro(), client
* drivers do not need to worry about freeing up memory.
*
* Returns zero on success, else an error.
*/
int mmc_gpio_request_ro(struct mmc_host *host, unsigned int gpio)
{
struct mmc_gpio *ctx = host->slot.handler_priv;
int ret;
if (!gpio_is_valid(gpio))
return -EINVAL;
ret = devm_gpio_request_one(host->parent, gpio, GPIOF_DIR_IN,
ctx->ro_label);
if (ret < 0)
return ret;
ctx->override_ro_active_level = true;
ctx->ro_gpio = gpio_to_desc(gpio);
return 0;
}
EXPORT_SYMBOL(mmc_gpio_request_ro);
void mmc_gpiod_request_cd_irq(struct mmc_host *host)
{
struct mmc_gpio *ctx = host->slot.handler_priv;
int ret, irq;
if (host->slot.cd_irq >= 0 || !ctx || !ctx->cd_gpio)
return;
irq = gpiod_to_irq(ctx->cd_gpio);
/*
* Even if gpiod_to_irq() returns a valid IRQ number, the platform might
* still prefer to poll, e.g., because that IRQ number is already used
* by another unit and cannot be shared.
*/
if (irq >= 0 && host->caps & MMC_CAP_NEEDS_POLL)
irq = -EINVAL;
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);
/* 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_gpio_request_cd - request a gpio for card-detection
* @host: mmc host
* @gpio: gpio number requested
* @debounce: debounce time in microseconds
*
* As devm_* managed functions are used in mmc_gpio_request_cd(), client
* drivers do not need to worry about freeing up memory.
*
* If GPIO debouncing is desired, set the debounce parameter to a non-zero
* value. The caller is responsible for ensuring that the GPIO driver associated
* with the GPIO supports debouncing, otherwise an error will be returned.
*
* Returns zero on success, else an error.
*/
int mmc_gpio_request_cd(struct mmc_host *host, unsigned int gpio,
unsigned int debounce)
{
struct mmc_gpio *ctx = host->slot.handler_priv;
int ret;
ret = devm_gpio_request_one(host->parent, gpio, GPIOF_DIR_IN,
ctx->cd_label);
if (ret < 0)
/*
* don't bother freeing memory. It might still get used by other
* slot functions, in any case it will be freed, when the device
* is destroyed.
*/
return ret;
if (debounce) {
ret = gpio_set_debounce(gpio, debounce);
if (ret < 0)
return ret;
}
ctx->override_cd_active_level = true;
ctx->cd_gpio = gpio_to_desc(gpio);
return 0;
}
EXPORT_SYMBOL(mmc_gpio_request_cd);
/**
* 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
* @gpio_invert: will return whether the GPIO line is inverted or not, set
* to NULL to ignore
*
* Use this function in place of mmc_gpio_request_cd() to use the GPIO
* descriptor API. Note that it 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, bool *gpio_invert)
{
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 (gpio_invert)
*gpio_invert = !gpiod_is_active_low(desc);
ctx->override_cd_active_level = override_active_level;
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
* @override_active_level: ignore %GPIO_ACTIVE_LOW flag
* @debounce: debounce time in microseconds
* @gpio_invert: will return whether the GPIO line is inverted or not,
* set to NULL to ignore
*
* Use this function in place of mmc_gpio_request_ro() to use the GPIO
* descriptor API.
*
* Returns zero on success, else an error.
*/
int mmc_gpiod_request_ro(struct mmc_host *host, const char *con_id,
unsigned int idx, bool override_active_level,
unsigned int debounce, bool *gpio_invert)
{
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 (gpio_invert)
*gpio_invert = !gpiod_is_active_low(desc);
ctx->override_ro_active_level = override_active_level;
ctx->ro_gpio = desc;
return 0;
}
EXPORT_SYMBOL(mmc_gpiod_request_ro);