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path: root/drivers/mmc/core/slot-gpio.c
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Diffstat (limited to 'drivers/mmc/core/slot-gpio.c')
-rw-r--r--drivers/mmc/core/slot-gpio.c200
1 files changed, 0 insertions, 200 deletions
diff --git a/drivers/mmc/core/slot-gpio.c b/drivers/mmc/core/slot-gpio.c
deleted file mode 100644
index 16a1c0b6f26..00000000000
--- a/drivers/mmc/core/slot-gpio.c
+++ /dev/null
@@ -1,200 +0,0 @@
1/*
2 * Generic GPIO card-detect helper
3 *
4 * Copyright (C) 2011, Guennadi Liakhovetski <g.liakhovetski@gmx.de>
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 */
10
11#include <linux/err.h>
12#include <linux/gpio.h>
13#include <linux/interrupt.h>
14#include <linux/jiffies.h>
15#include <linux/mmc/host.h>
16#include <linux/mmc/slot-gpio.h>
17#include <linux/module.h>
18#include <linux/slab.h>
19
20struct mmc_gpio {
21 int ro_gpio;
22 int cd_gpio;
23 char *ro_label;
24 char cd_label[0];
25};
26
27static irqreturn_t mmc_gpio_cd_irqt(int irq, void *dev_id)
28{
29 /* Schedule a card detection after a debounce timeout */
30 struct mmc_host *host = dev_id;
31
32 if (host->ops->card_event)
33 host->ops->card_event(host);
34
35 mmc_detect_change(host, msecs_to_jiffies(200));
36
37 return IRQ_HANDLED;
38}
39
40static int mmc_gpio_alloc(struct mmc_host *host)
41{
42 size_t len = strlen(dev_name(host->parent)) + 4;
43 struct mmc_gpio *ctx;
44
45 mutex_lock(&host->slot.lock);
46
47 ctx = host->slot.handler_priv;
48 if (!ctx) {
49 /*
50 * devm_kzalloc() can be called after device_initialize(), even
51 * before device_add(), i.e., between mmc_alloc_host() and
52 * mmc_add_host()
53 */
54 ctx = devm_kzalloc(&host->class_dev, sizeof(*ctx) + 2 * len,
55 GFP_KERNEL);
56 if (ctx) {
57 ctx->ro_label = ctx->cd_label + len;
58 snprintf(ctx->cd_label, len, "%s cd", dev_name(host->parent));
59 snprintf(ctx->ro_label, len, "%s ro", dev_name(host->parent));
60 ctx->cd_gpio = -EINVAL;
61 ctx->ro_gpio = -EINVAL;
62 host->slot.handler_priv = ctx;
63 }
64 }
65
66 mutex_unlock(&host->slot.lock);
67
68 return ctx ? 0 : -ENOMEM;
69}
70
71int mmc_gpio_get_ro(struct mmc_host *host)
72{
73 struct mmc_gpio *ctx = host->slot.handler_priv;
74
75 if (!ctx || !gpio_is_valid(ctx->ro_gpio))
76 return -ENOSYS;
77
78 return !gpio_get_value_cansleep(ctx->ro_gpio) ^
79 !!(host->caps2 & MMC_CAP2_RO_ACTIVE_HIGH);
80}
81EXPORT_SYMBOL(mmc_gpio_get_ro);
82
83int mmc_gpio_get_cd(struct mmc_host *host)
84{
85 struct mmc_gpio *ctx = host->slot.handler_priv;
86
87 if (!ctx || !gpio_is_valid(ctx->cd_gpio))
88 return -ENOSYS;
89
90 return !gpio_get_value_cansleep(ctx->cd_gpio) ^
91 !!(host->caps2 & MMC_CAP2_CD_ACTIVE_HIGH);
92}
93EXPORT_SYMBOL(mmc_gpio_get_cd);
94
95int mmc_gpio_request_ro(struct mmc_host *host, unsigned int gpio)
96{
97 struct mmc_gpio *ctx;
98 int ret;
99
100 if (!gpio_is_valid(gpio))
101 return -EINVAL;
102
103 ret = mmc_gpio_alloc(host);
104 if (ret < 0)
105 return ret;
106
107 ctx = host->slot.handler_priv;
108
109 ret = gpio_request_one(gpio, GPIOF_DIR_IN, ctx->ro_label);
110 if (ret < 0)
111 return ret;
112
113 ctx->ro_gpio = gpio;
114
115 return 0;
116}
117EXPORT_SYMBOL(mmc_gpio_request_ro);
118
119int mmc_gpio_request_cd(struct mmc_host *host, unsigned int gpio)
120{
121 struct mmc_gpio *ctx;
122 int irq = gpio_to_irq(gpio);
123 int ret;
124
125 ret = mmc_gpio_alloc(host);
126 if (ret < 0)
127 return ret;
128
129 ctx = host->slot.handler_priv;
130
131 ret = gpio_request_one(gpio, GPIOF_DIR_IN, ctx->cd_label);
132 if (ret < 0)
133 /*
134 * don't bother freeing memory. It might still get used by other
135 * slot functions, in any case it will be freed, when the device
136 * is destroyed.
137 */
138 return ret;
139
140 /*
141 * Even if gpio_to_irq() returns a valid IRQ number, the platform might
142 * still prefer to poll, e.g., because that IRQ number is already used
143 * by another unit and cannot be shared.
144 */
145 if (irq >= 0 && host->caps & MMC_CAP_NEEDS_POLL)
146 irq = -EINVAL;
147
148 if (irq >= 0) {
149 ret = request_threaded_irq(irq, NULL, mmc_gpio_cd_irqt,
150 IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
151 ctx->cd_label, host);
152 if (ret < 0)
153 irq = ret;
154 }
155
156 host->slot.cd_irq = irq;
157
158 if (irq < 0)
159 host->caps |= MMC_CAP_NEEDS_POLL;
160
161 ctx->cd_gpio = gpio;
162
163 return 0;
164}
165EXPORT_SYMBOL(mmc_gpio_request_cd);
166
167void mmc_gpio_free_ro(struct mmc_host *host)
168{
169 struct mmc_gpio *ctx = host->slot.handler_priv;
170 int gpio;
171
172 if (!ctx || !gpio_is_valid(ctx->ro_gpio))
173 return;
174
175 gpio = ctx->ro_gpio;
176 ctx->ro_gpio = -EINVAL;
177
178 gpio_free(gpio);
179}
180EXPORT_SYMBOL(mmc_gpio_free_ro);
181
182void mmc_gpio_free_cd(struct mmc_host *host)
183{
184 struct mmc_gpio *ctx = host->slot.handler_priv;
185 int gpio;
186
187 if (!ctx || !gpio_is_valid(ctx->cd_gpio))
188 return;
189
190 if (host->slot.cd_irq >= 0) {
191 free_irq(host->slot.cd_irq, host);
192 host->slot.cd_irq = -EINVAL;
193 }
194
195 gpio = ctx->cd_gpio;
196 ctx->cd_gpio = -EINVAL;
197
198 gpio_free(gpio);
199}
200EXPORT_SYMBOL(mmc_gpio_free_cd);
generated by cgit v1.2.2 (git 2.25.0) at 2025-01-28 02:26:46 -0500