1 // SPDX-License-Identifier: GPL-2.0-only
3  * Generic GPIO card-detect helper
13 #include <linux/mmc/slot-gpio.h>
17 #include "slot-gpio.h"
33 	struct mmc_gpio *ctx = host->slot.handler_priv;  in mmc_gpio_cd_irqt()
35 	host->trigger_card_event = true;  in mmc_gpio_cd_irqt()
36 	mmc_detect_change(host, msecs_to_jiffies(ctx->cd_debounce_delay_ms));  in mmc_gpio_cd_irqt()
43 	const char *devname = dev_name(host->parent);  in mmc_gpio_alloc()
46 	ctx = devm_kzalloc(host->parent, sizeof(*ctx), GFP_KERNEL);  in mmc_gpio_alloc()
48 		return -ENOMEM;  in mmc_gpio_alloc()
50 	ctx->cd_debounce_delay_ms = 200;  in mmc_gpio_alloc()
51 	ctx->cd_label = devm_kasprintf(host->parent, GFP_KERNEL, "%s cd", devname);  in mmc_gpio_alloc()
52 	if (!ctx->cd_label)  in mmc_gpio_alloc()
53 		return -ENOMEM;  in mmc_gpio_alloc()
54 	ctx->ro_label = devm_kasprintf(host->parent, GFP_KERNEL, "%s ro", devname);  in mmc_gpio_alloc()
55 	if (!ctx->ro_label)  in mmc_gpio_alloc()
56 		return -ENOMEM;  in mmc_gpio_alloc()
57 	ctx->cd_irq = -EINVAL;  in mmc_gpio_alloc()
58 	host->slot.handler_priv = ctx;  in mmc_gpio_alloc()
59 	host->slot.cd_irq = -EINVAL;  in mmc_gpio_alloc()
66 	struct mmc_gpio *ctx = host->slot.handler_priv;  in mmc_gpio_set_cd_irq()
71 	ctx->cd_irq = irq;  in mmc_gpio_set_cd_irq()
77 	struct mmc_gpio *ctx = host->slot.handler_priv;  in mmc_gpio_get_ro()
80 	if (!ctx || !ctx->ro_gpio)  in mmc_gpio_get_ro()
81 		return -ENOSYS;  in mmc_gpio_get_ro()
83 	cansleep = gpiod_cansleep(ctx->ro_gpio);  in mmc_gpio_get_ro()
85 		gpiod_get_value_cansleep(ctx->ro_gpio) :  in mmc_gpio_get_ro()
86 		gpiod_get_value(ctx->ro_gpio);  in mmc_gpio_get_ro()
92 	struct mmc_gpio *ctx = host->slot.handler_priv;  in mmc_gpio_get_cd()
95 	if (!ctx || !ctx->cd_gpio)  in mmc_gpio_get_cd()
96 		return -ENOSYS;  in mmc_gpio_get_cd()
98 	cansleep = gpiod_cansleep(ctx->cd_gpio);  in mmc_gpio_get_cd()
100 		gpiod_get_value_cansleep(ctx->cd_gpio) :  in mmc_gpio_get_cd()
101 		gpiod_get_value(ctx->cd_gpio);  in mmc_gpio_get_cd()
107 	struct mmc_gpio *ctx = host->slot.handler_priv;  in mmc_gpiod_request_cd_irq()
108 	int irq = -EINVAL;  in mmc_gpiod_request_cd_irq()
111 	if (host->slot.cd_irq >= 0 || !ctx || !ctx->cd_gpio)  in mmc_gpiod_request_cd_irq()
118 	if (ctx->cd_irq >= 0)  in mmc_gpiod_request_cd_irq()
119 		irq = ctx->cd_irq;  in mmc_gpiod_request_cd_irq()
120 	else if (!(host->caps & MMC_CAP_NEEDS_POLL))  in mmc_gpiod_request_cd_irq()
121 		irq = gpiod_to_irq(ctx->cd_gpio);  in mmc_gpiod_request_cd_irq()
124 		if (!ctx->cd_gpio_isr)  in mmc_gpiod_request_cd_irq()
125 			ctx->cd_gpio_isr = mmc_gpio_cd_irqt;  in mmc_gpiod_request_cd_irq()
126 		ret = devm_request_threaded_irq(host->parent, irq,  in mmc_gpiod_request_cd_irq()
127 			NULL, ctx->cd_gpio_isr,  in mmc_gpiod_request_cd_irq()
129 			ctx->cd_label, host);  in mmc_gpiod_request_cd_irq()
134 	host->slot.cd_irq = irq;  in mmc_gpiod_request_cd_irq()
137 		host->caps |= MMC_CAP_NEEDS_POLL;  in mmc_gpiod_request_cd_irq()
145 	if (!(host->caps & MMC_CAP_CD_WAKE) ||  in mmc_gpio_set_cd_wake()
146 	    host->slot.cd_irq < 0 ||  in mmc_gpio_set_cd_wake()
147 	    on == host->slot.cd_wake_enabled)  in mmc_gpio_set_cd_wake()
151 		ret = enable_irq_wake(host->slot.cd_irq);  in mmc_gpio_set_cd_wake()
152 		host->slot.cd_wake_enabled = !ret;  in mmc_gpio_set_cd_wake()
154 		disable_irq_wake(host->slot.cd_irq);  in mmc_gpio_set_cd_wake()
155 		host->slot.cd_wake_enabled = false;  in mmc_gpio_set_cd_wake()
163  * the card-detect GPIO.
167 	struct mmc_gpio *ctx = host->slot.handler_priv;  in mmc_gpio_set_cd_isr()
169 	WARN_ON(ctx->cd_gpio_isr);  in mmc_gpio_set_cd_isr()
170 	ctx->cd_gpio_isr = isr;  in mmc_gpio_set_cd_isr()
175  * mmc_gpiod_request_cd - request a gpio descriptor for card-detection
180  * @debounce: debounce time in microseconds
191 	struct mmc_gpio *ctx = host->slot.handler_priv;  in mmc_gpiod_request_cd()
195 	desc = devm_gpiod_get_index(host->parent, con_id, idx, GPIOD_IN);  in mmc_gpiod_request_cd()
201 		gpiod_set_consumer_name(desc, ctx->cd_label);  in mmc_gpiod_request_cd()
206 			ctx->cd_debounce_delay_ms = debounce / 1000;  in mmc_gpiod_request_cd()
209 	/* override forces default (active-low) polarity ... */  in mmc_gpiod_request_cd()
213 	/* ... or active-high */  in mmc_gpiod_request_cd()
214 	if (host->caps2 & MMC_CAP2_CD_ACTIVE_HIGH)  in mmc_gpiod_request_cd()
217 	ctx->cd_gpio = desc;  in mmc_gpiod_request_cd()
224  * mmc_gpiod_set_cd_config - set config for card-detection GPIO
228  * This can be used by mmc host drivers to fixup a card-detection GPIO's config
237 	struct mmc_gpio *ctx = host->slot.handler_priv;  in mmc_gpiod_set_cd_config()
239 	return gpiod_set_config(ctx->cd_gpio, config);  in mmc_gpiod_set_cd_config()
245 	struct mmc_gpio *ctx = host->slot.handler_priv;  in mmc_can_gpio_cd()
247 	return ctx->cd_gpio ? true : false;  in mmc_can_gpio_cd()
252  * mmc_gpiod_request_ro - request a gpio descriptor for write protection
256  * @debounce: debounce time in microseconds
263 	struct mmc_gpio *ctx = host->slot.handler_priv;  in mmc_gpiod_request_ro()
267 	desc = devm_gpiod_get_index(host->parent, con_id, idx, GPIOD_IN);  in mmc_gpiod_request_ro()
273 		gpiod_set_consumer_name(desc, ctx->ro_label);  in mmc_gpiod_request_ro()
281 	if (host->caps2 & MMC_CAP2_RO_ACTIVE_HIGH)  in mmc_gpiod_request_ro()
284 	ctx->ro_gpio = desc;  in mmc_gpiod_request_ro()
292 	struct mmc_gpio *ctx = host->slot.handler_priv;  in mmc_can_gpio_ro()
294 	return ctx->ro_gpio ? true : false;  in mmc_can_gpio_ro()