diff options
Diffstat (limited to 'drivers/mmc/core/slot-gpio.c')
| -rw-r--r-- | drivers/mmc/core/slot-gpio.c | 151 |
1 files changed, 83 insertions, 68 deletions
diff --git a/drivers/mmc/core/slot-gpio.c b/drivers/mmc/core/slot-gpio.c index 319ccd93383d..c5bc6268803e 100644 --- a/drivers/mmc/core/slot-gpio.c +++ b/drivers/mmc/core/slot-gpio.c @@ -1,11 +1,8 @@ +// SPDX-License-Identifier: GPL-2.0-only /* * 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> @@ -22,12 +19,11 @@ 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); + irq_handler_t cd_gpio_isr; char *ro_label; char *cd_label; u32 cd_debounce_delay_ms; + int cd_irq; }; static irqreturn_t mmc_gpio_cd_irqt(int irq, void *dev_id) @@ -44,38 +40,50 @@ static irqreturn_t mmc_gpio_cd_irqt(int irq, void *dev_id) 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; - } + const char *devname = dev_name(host->parent); + struct mmc_gpio *ctx; + + ctx = devm_kzalloc(host->parent, sizeof(*ctx), GFP_KERNEL); + if (!ctx) + return -ENOMEM; + + ctx->cd_debounce_delay_ms = 200; + ctx->cd_label = devm_kasprintf(host->parent, GFP_KERNEL, "%s cd", devname); + if (!ctx->cd_label) + return -ENOMEM; + ctx->ro_label = devm_kasprintf(host->parent, GFP_KERNEL, "%s ro", devname); + if (!ctx->ro_label) + return -ENOMEM; + ctx->cd_irq = -EINVAL; + host->slot.handler_priv = ctx; + host->slot.cd_irq = -EINVAL; + + return 0; +} + +void mmc_gpio_set_cd_irq(struct mmc_host *host, int irq) +{ + struct mmc_gpio *ctx = host->slot.handler_priv; + + if (!ctx || irq < 0) + return; - return ctx ? 0 : -ENOMEM; + ctx->cd_irq = irq; } +EXPORT_SYMBOL(mmc_gpio_set_cd_irq); int mmc_gpio_get_ro(struct mmc_host *host) { struct mmc_gpio *ctx = host->slot.handler_priv; + int cansleep; 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); + cansleep = gpiod_cansleep(ctx->ro_gpio); + return cansleep ? + gpiod_get_value_cansleep(ctx->ro_gpio) : + gpiod_get_value(ctx->ro_gpio); } EXPORT_SYMBOL(mmc_gpio_get_ro); @@ -88,13 +96,6 @@ int mmc_gpio_get_cd(struct mmc_host *host) return -ENOSYS; cansleep = gpiod_cansleep(ctx->cd_gpio); - if (ctx->override_cd_active_level) { - int value = cansleep ? - gpiod_get_raw_value_cansleep(ctx->cd_gpio) : - gpiod_get_raw_value(ctx->cd_gpio); - return !value ^ !!(host->caps2 & MMC_CAP2_CD_ACTIVE_HIGH); - } - return cansleep ? gpiod_get_value_cansleep(ctx->cd_gpio) : gpiod_get_value(ctx->cd_gpio); @@ -114,7 +115,9 @@ void mmc_gpiod_request_cd_irq(struct mmc_host *host) * 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)) + if (ctx->cd_irq >= 0) + irq = ctx->cd_irq; + else if (!(host->caps & MMC_CAP_NEEDS_POLL)) irq = gpiod_to_irq(ctx->cd_gpio); if (irq >= 0) { @@ -156,19 +159,6 @@ int mmc_gpio_set_cd_wake(struct mmc_host *host, bool on) } 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 @@ -176,8 +166,6 @@ EXPORT_SYMBOL(mmc_gpio_set_cd_isr); * @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 * * Note that this must be called prior to mmc_add_host() * otherwise the caller must also call mmc_gpiod_request_cd_irq(). @@ -186,7 +174,7 @@ EXPORT_SYMBOL(mmc_gpio_set_cd_isr); */ 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) + unsigned int debounce) { struct mmc_gpio *ctx = host->slot.handler_priv; struct gpio_desc *desc; @@ -196,45 +184,69 @@ int mmc_gpiod_request_cd(struct mmc_host *host, const char *con_id, if (IS_ERR(desc)) return PTR_ERR(desc); + /* Update default label if no con_id provided */ + if (!con_id) + gpiod_set_consumer_name(desc, ctx->cd_label); + if (debounce) { ret = gpiod_set_debounce(desc, debounce); if (ret < 0) ctx->cd_debounce_delay_ms = debounce / 1000; } - if (gpio_invert) - *gpio_invert = !gpiod_is_active_low(desc); + /* 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->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) +/** + * mmc_gpiod_set_cd_config - set config for card-detection GPIO + * @host: mmc host + * @config: Generic pinconf config (from pinconf_to_config_packed()) + * + * This can be used by mmc host drivers to fixup a card-detection GPIO's config + * (e.g. set PIN_CONFIG_BIAS_PULL_UP) after acquiring the GPIO descriptor + * through mmc_gpiod_request_cd(). + * + * Returns: + * 0 on success, or a negative errno value on error. + */ +int mmc_gpiod_set_cd_config(struct mmc_host *host, unsigned long config) +{ + struct mmc_gpio *ctx = host->slot.handler_priv; + + return gpiod_set_config(ctx->cd_gpio, config); +} +EXPORT_SYMBOL(mmc_gpiod_set_cd_config); + +bool mmc_host_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); +EXPORT_SYMBOL(mmc_host_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 * * 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) + unsigned int idx, unsigned int debounce) { struct mmc_gpio *ctx = host->slot.handler_priv; struct gpio_desc *desc; @@ -244,26 +256,29 @@ int mmc_gpiod_request_ro(struct mmc_host *host, const char *con_id, if (IS_ERR(desc)) return PTR_ERR(desc); + /* Update default label if no con_id provided */ + if (!con_id) + gpiod_set_consumer_name(desc, ctx->ro_label); + if (debounce) { ret = gpiod_set_debounce(desc, debounce); if (ret < 0) return ret; } - if (gpio_invert) - *gpio_invert = !gpiod_is_active_low(desc); + if (host->caps2 & MMC_CAP2_RO_ACTIVE_HIGH) + gpiod_toggle_active_low(desc); - ctx->override_ro_active_level = override_active_level; ctx->ro_gpio = desc; return 0; } EXPORT_SYMBOL(mmc_gpiod_request_ro); -bool mmc_can_gpio_ro(struct mmc_host *host) +bool mmc_host_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); +EXPORT_SYMBOL(mmc_host_can_gpio_ro); |