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1 | /* |
2 | * |
3 | * arch/arm/mach-u300/mmc.c |
4 | * |
5 | * |
6 | * Copyright (C) 2009 ST-Ericsson AB |
7 | * License terms: GNU General Public License (GPL) version 2 |
8 | * |
9 | * Author: Linus Walleij <linus.walleij@stericsson.com> |
10 | * Author: Johan Lundin <johan.lundin@stericsson.com> |
11 | * Author: Jonas Aaberg <jonas.aberg@stericsson.com> |
12 | */ |
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> |
24 | |
25 | #include "mmc.h" |
26 | #include "padmux.h" |
27 | |
28 | struct mmci_card_event { |
29 | struct input_dev *mmc_input; |
30 | int mmc_inserted; |
31 | struct work_struct workq; |
32 | struct mmci_platform_data mmc0_plat_data; |
33 | }; |
34 | |
35 | static unsigned int mmc_status(struct device *dev) |
36 | { |
37 | struct mmci_card_event *mmci_card = container_of( |
38 | dev->platform_data, |
39 | struct mmci_card_event, mmc0_plat_data); |
40 | |
41 | return mmci_card->mmc_inserted; |
42 | } |
43 | |
44 | static int mmci_callback(void *data) |
45 | { |
46 | struct mmci_card_event *mmci_card = data; |
47 | |
48 | disable_irq_on_gpio_pin(U300_GPIO_PIN_MMC_CD); |
49 | schedule_work(&mmci_card->workq); |
50 | |
51 | return 0; |
52 | } |
53 | |
54 | |
55 | static ssize_t gpio_show(struct device *dev, struct device_attribute *attr, |
56 | char *buf) |
57 | { |
58 | struct mmci_card_event *mmci_card = container_of( |
59 | dev->platform_data, |
60 | struct mmci_card_event, mmc0_plat_data); |
61 | |
62 | |
63 | return sprintf(buf, "%d\n", !mmci_card->mmc_inserted); |
64 | } |
65 | |
66 | static DEVICE_ATTR(mmc_inserted, S_IRUGO, gpio_show, NULL); |
67 | |
68 | static void _mmci_callback(struct work_struct *ws) |
69 | { |
70 | |
71 | struct mmci_card_event *mmci_card = container_of( |
72 | ws, |
73 | struct mmci_card_event, workq); |
74 | |
75 | mdelay(20); |
76 | |
77 | mmci_card->mmc_inserted = !gpio_get_value(U300_GPIO_PIN_MMC_CD); |
78 | |
79 | input_report_switch(mmci_card->mmc_input, KEY_INSERT, |
80 | mmci_card->mmc_inserted); |
81 | input_sync(mmci_card->mmc_input); |
82 | |
83 | pr_debug("MMC/SD card was %s\n", |
84 | mmci_card->mmc_inserted ? "inserted" : "removed"); |
85 | |
86 | enable_irq_on_gpio_pin(U300_GPIO_PIN_MMC_CD, mmci_card->mmc_inserted); |
87 | } |
88 | |
89 | int __devinit mmc_init(struct amba_device *adev) |
90 | { |
91 | struct mmci_card_event *mmci_card; |
92 | struct device *mmcsd_device = &adev->dev; |
93 | struct pmx *pmx; |
94 | int ret = 0; |
95 | |
96 | mmci_card = kzalloc(sizeof(struct mmci_card_event), GFP_KERNEL); |
97 | if (!mmci_card) |
98 | return -ENOMEM; |
99 | |
100 | /* |
101 | * Do not set ocr_mask or voltage translation function, |
102 | * we have a regulator we can control instead. |
103 | */ |
104 | /* Nominally 2.85V on our platform */ |
105 | mmci_card->mmc0_plat_data.f_max = 24000000; |
106 | mmci_card->mmc0_plat_data.status = mmc_status; |
107 | mmci_card->mmc0_plat_data.gpio_wp = -1; |
108 | mmci_card->mmc0_plat_data.gpio_cd = -1; |
109 | mmci_card->mmc0_plat_data.capabilities = MMC_CAP_MMC_HIGHSPEED | |
110 | MMC_CAP_SD_HIGHSPEED | MMC_CAP_4_BIT_DATA | MMC_CAP_8_BIT_DATA; |
111 | |
112 | mmcsd_device->platform_data = (void *) &mmci_card->mmc0_plat_data; |
113 | |
114 | INIT_WORK(&mmci_card->workq, _mmci_callback); |
115 | |
116 | ret = gpio_request(U300_GPIO_PIN_MMC_CD, "MMC card detection"); |
117 | if (ret) { |
118 | printk(KERN_CRIT "Could not allocate MMC card detection " \ |
119 | "GPIO pin\n"); |
120 | goto out; |
121 | } |
122 | |
123 | ret = gpio_direction_input(U300_GPIO_PIN_MMC_CD); |
124 | if (ret) { |
125 | printk(KERN_CRIT "Invalid GPIO pin requested\n"); |
126 | goto out; |
127 | } |
128 | |
129 | ret = sysfs_create_file(&mmcsd_device->kobj, |
130 | &dev_attr_mmc_inserted.attr); |
131 | if (ret) |
132 | goto out; |
133 | |
134 | mmci_card->mmc_input = input_allocate_device(); |
135 | if (!mmci_card->mmc_input) { |
136 | printk(KERN_CRIT "Could not allocate MMC input device\n"); |
137 | return -ENOMEM; |
138 | } |
139 | |
140 | mmci_card->mmc_input->name = "MMC insert notification"; |
141 | mmci_card->mmc_input->id.bustype = BUS_HOST; |
142 | mmci_card->mmc_input->id.vendor = 0; |
143 | mmci_card->mmc_input->id.product = 0; |
144 | mmci_card->mmc_input->id.version = 0x0100; |
145 | mmci_card->mmc_input->dev.parent = mmcsd_device; |
146 | input_set_capability(mmci_card->mmc_input, EV_SW, KEY_INSERT); |
147 | |
148 | /* |
149 | * Since this must always be compiled into the kernel, this input |
150 | * is never unregistered or free:ed. |
151 | */ |
152 | ret = input_register_device(mmci_card->mmc_input); |
153 | if (ret) { |
154 | input_free_device(mmci_card->mmc_input); |
155 | goto out; |
156 | } |
157 | |
158 | input_set_drvdata(mmci_card->mmc_input, mmci_card); |
159 | |
160 | /* |
161 | * Setup padmuxing for MMC. Since this must always be |
162 | * compiled into the kernel, pmx is never released. |
163 | */ |
164 | pmx = pmx_get(mmcsd_device, U300_APP_PMX_MMC_SETTING); |
165 | |
166 | if (IS_ERR(pmx)) |
167 | pr_warning("Could not get padmux handle\n"); |
168 | else { |
169 | ret = pmx_activate(mmcsd_device, pmx); |
170 | if (IS_ERR_VALUE(ret)) |
171 | pr_warning("Could not activate padmuxing\n"); |
172 | } |
173 | |
174 | ret = gpio_register_callback(U300_GPIO_PIN_MMC_CD, mmci_callback, |
175 | mmci_card); |
176 | |
177 | schedule_work(&mmci_card->workq); |
178 | |
179 | printk(KERN_INFO "Registered MMC insert/remove notification\n"); |
180 | out: |
181 | return ret; |
182 | } |
183 |
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