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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
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
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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);
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108
109int mmc_gpio_request_ro(struct mmc_host *host, unsigned int gpio)
110{
111 struct mmc_gpio *ctx;
112 int ret;
113
114 if (!gpio_is_valid(gpio))
115 return -EINVAL;
116
117 ret = mmc_gpio_alloc(host);
118 if (ret < 0)
119 return ret;
120
121 ctx = host->slot.handler_priv;
122
123 ret = devm_gpio_request_one(&host->class_dev, gpio, GPIOF_DIR_IN,
124 ctx->ro_label);
125 if (ret < 0)
126 return ret;
127
128 ctx->ro_gpio = gpio;
129
130 return 0;
131}
132EXPORT_SYMBOL(mmc_gpio_request_ro);
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148int mmc_gpio_request_cd(struct mmc_host *host, unsigned int gpio)
149{
150 struct mmc_gpio *ctx;
151 int irq = gpio_to_irq(gpio);
152 int ret;
153
154 ret = mmc_gpio_alloc(host);
155 if (ret < 0)
156 return ret;
157
158 ctx = host->slot.handler_priv;
159
160 ret = devm_gpio_request_one(&host->class_dev, gpio, GPIOF_DIR_IN,
161 ctx->cd_label);
162 if (ret < 0)
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167
168 return ret;
169
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174
175 if (irq >= 0 && host->caps & MMC_CAP_NEEDS_POLL)
176 irq = -EINVAL;
177
178 if (irq >= 0) {
179 ret = devm_request_threaded_irq(&host->class_dev, irq,
180 NULL, mmc_gpio_cd_irqt,
181 IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
182 ctx->cd_label, host);
183 if (ret < 0)
184 irq = ret;
185 }
186
187 host->slot.cd_irq = irq;
188
189 if (irq < 0)
190 host->caps |= MMC_CAP_NEEDS_POLL;
191
192 ctx->cd_gpio = gpio;
193
194 return 0;
195}
196EXPORT_SYMBOL(mmc_gpio_request_cd);
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204
205void mmc_gpio_free_ro(struct mmc_host *host)
206{
207 struct mmc_gpio *ctx = host->slot.handler_priv;
208 int gpio;
209
210 if (!ctx || !gpio_is_valid(ctx->ro_gpio))
211 return;
212
213 gpio = ctx->ro_gpio;
214 ctx->ro_gpio = -EINVAL;
215
216 devm_gpio_free(&host->class_dev, gpio);
217}
218EXPORT_SYMBOL(mmc_gpio_free_ro);
219
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227void mmc_gpio_free_cd(struct mmc_host *host)
228{
229 struct mmc_gpio *ctx = host->slot.handler_priv;
230 int gpio;
231
232 if (!ctx || !gpio_is_valid(ctx->cd_gpio))
233 return;
234
235 if (host->slot.cd_irq >= 0) {
236 devm_free_irq(&host->class_dev, host->slot.cd_irq, host);
237 host->slot.cd_irq = -EINVAL;
238 }
239
240 gpio = ctx->cd_gpio;
241 ctx->cd_gpio = -EINVAL;
242
243 devm_gpio_free(&host->class_dev, gpio);
244}
245EXPORT_SYMBOL(mmc_gpio_free_cd);
246