3 * arch/arm/mach-u300/mmc.c
6 * Copyright (C) 2009 ST-Ericsson AB
7 * License terms: GNU General Public License (GPL) version 2
9 * Author: Linus Walleij <linus.walleij@stericsson.com>
10 * Author: Johan Lundin <johan.lundin@stericsson.com>
11 * Author: Jonas Aaberg <jonas.aberg@stericsson.com>
13 #include <linux/device.h>
14 #include <linux/amba/bus.h>
15 #include <linux/mmc/host.h>
16 #include <linux/input.h>
17 #include <linux/workqueue.h>
18 #include <linux/delay.h>
19 #include <linux/regulator/consumer.h>
20 #include <linux/regulator/machine.h>
21 #include <linux/gpio.h>
22 #include <linux/amba/mmci.h>
23 #include <linux/slab.h>
28 struct mmci_card_event
{
29 struct input_dev
*mmc_input
;
31 struct work_struct workq
;
32 struct mmci_platform_data mmc0_plat_data
;
35 static unsigned int mmc_status(struct device
*dev
)
37 struct mmci_card_event
*mmci_card
= container_of(
39 struct mmci_card_event
, mmc0_plat_data
);
41 return mmci_card
->mmc_inserted
;
44 static int mmci_callback(void *data
)
46 struct mmci_card_event
*mmci_card
= data
;
48 disable_irq_on_gpio_pin(U300_GPIO_PIN_MMC_CD
);
49 schedule_work(&mmci_card
->workq
);
55 static ssize_t
gpio_show(struct device
*dev
, struct device_attribute
*attr
,
58 struct mmci_card_event
*mmci_card
= container_of(
60 struct mmci_card_event
, mmc0_plat_data
);
63 return sprintf(buf
, "%d\n", !mmci_card
->mmc_inserted
);
66 static DEVICE_ATTR(mmc_inserted
, S_IRUGO
, gpio_show
, NULL
);
68 static void _mmci_callback(struct work_struct
*ws
)
71 struct mmci_card_event
*mmci_card
= container_of(
73 struct mmci_card_event
, workq
);
77 mmci_card
->mmc_inserted
= !!gpio_get_value(U300_GPIO_PIN_MMC_CD
);
79 input_report_switch(mmci_card
->mmc_input
, KEY_INSERT
,
80 !mmci_card
->mmc_inserted
);
81 input_sync(mmci_card
->mmc_input
);
83 pr_debug("MMC/SD card was %s\n",
84 mmci_card
->mmc_inserted
? "removed" : "inserted");
86 enable_irq_on_gpio_pin(U300_GPIO_PIN_MMC_CD
, !mmci_card
->mmc_inserted
);
89 int __devinit
mmc_init(struct amba_device
*adev
)
91 struct mmci_card_event
*mmci_card
;
92 struct device
*mmcsd_device
= &adev
->dev
;
96 mmci_card
= kzalloc(sizeof(struct mmci_card_event
), GFP_KERNEL
);
101 * Do not set ocr_mask or voltage translation function,
102 * we have a regulator we can control instead.
104 /* Nominally 2.85V on our platform */
105 mmci_card
->mmc0_plat_data
.status
= mmc_status
;
106 mmci_card
->mmc0_plat_data
.gpio_wp
= -1;
107 mmci_card
->mmc0_plat_data
.gpio_cd
= -1;
108 mmci_card
->mmc0_plat_data
.capabilities
= MMC_CAP_MMC_HIGHSPEED
|
109 MMC_CAP_SD_HIGHSPEED
| MMC_CAP_4_BIT_DATA
;
111 mmcsd_device
->platform_data
= (void *) &mmci_card
->mmc0_plat_data
;
113 INIT_WORK(&mmci_card
->workq
, _mmci_callback
);
115 ret
= gpio_request(U300_GPIO_PIN_MMC_CD
, "MMC card detection");
117 printk(KERN_CRIT
"Could not allocate MMC card detection " \
122 ret
= gpio_direction_input(U300_GPIO_PIN_MMC_CD
);
124 printk(KERN_CRIT
"Invalid GPIO pin requested\n");
128 ret
= sysfs_create_file(&mmcsd_device
->kobj
,
129 &dev_attr_mmc_inserted
.attr
);
133 mmci_card
->mmc_input
= input_allocate_device();
134 if (!mmci_card
->mmc_input
) {
135 printk(KERN_CRIT
"Could not allocate MMC input device\n");
139 mmci_card
->mmc_input
->name
= "MMC insert notification";
140 mmci_card
->mmc_input
->id
.bustype
= BUS_HOST
;
141 mmci_card
->mmc_input
->id
.vendor
= 0;
142 mmci_card
->mmc_input
->id
.product
= 0;
143 mmci_card
->mmc_input
->id
.version
= 0x0100;
144 mmci_card
->mmc_input
->dev
.parent
= mmcsd_device
;
145 input_set_capability(mmci_card
->mmc_input
, EV_SW
, KEY_INSERT
);
148 * Since this must always be compiled into the kernel, this input
149 * is never unregistered or free:ed.
151 ret
= input_register_device(mmci_card
->mmc_input
);
153 input_free_device(mmci_card
->mmc_input
);
157 input_set_drvdata(mmci_card
->mmc_input
, mmci_card
);
160 * Setup padmuxing for MMC. Since this must always be
161 * compiled into the kernel, pmx is never released.
163 pmx
= pmx_get(mmcsd_device
, U300_APP_PMX_MMC_SETTING
);
166 pr_warning("Could not get padmux handle\n");
168 ret
= pmx_activate(mmcsd_device
, pmx
);
169 if (IS_ERR_VALUE(ret
))
170 pr_warning("Could not activate padmuxing\n");
173 ret
= gpio_register_callback(U300_GPIO_PIN_MMC_CD
, mmci_callback
,
176 schedule_work(&mmci_card
->workq
);
178 printk(KERN_INFO
"Registered MMC insert/remove notification\n");