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
23 #include <asm/mach/mmc.h>
24 #include "mmc.h"
25
26 struct mmci_card_event {
27 struct input_dev *mmc_input;
28 int mmc_inserted;
29 struct work_struct workq;
30 struct mmc_platform_data mmc0_plat_data;
31 };
32
33 static unsigned int mmc_status(struct device *dev)
34 {
35 struct mmci_card_event *mmci_card = container_of(
36 dev->platform_data,
37 struct mmci_card_event, mmc0_plat_data);
38
39 return mmci_card->mmc_inserted;
40 }
41
42 /*
43 * Here follows a large chunk of code which will only be enabled if you
44 * have both the AB3100 chip mounted and the MMC subsystem activated.
45 */
46
47 static u32 mmc_translate_vdd(struct device *dev, unsigned int voltage)
48 {
49 int v;
50
51 /*
52 * MMC Spec:
53 * bit 7: 1.70 - 1.95V
54 * bit 8 - 14: 2.0 - 2.6V
55 * bit 15 - 23: 2.7 - 3.6V
56 *
57 * ab3100 voltages:
58 * 000 - 2.85V
59 * 001 - 2.75V
60 * 010 - 1.8V
61 * 011 - 1.5V
62 */
63 switch (voltage) {
64 case 8:
65 v = 3;
66 break;
67 case 9:
68 case 10:
69 case 11:
70 case 12:
71 case 13:
72 case 14:
73 case 15:
74 v = 1;
75 break;
76 case 16:
77 v = 1;
78 break;
79 case 17:
80 case 18:
81 case 19:
82 case 20:
83 case 21:
84 case 22:
85 case 23:
86 case 24:
87 v = 0;
88 break;
89 default:
90 v = 0;
91 break;
92 }
93
94 /* PL180 voltage register bits */
95 return v << 2;
96 }
97
98
99
100 static int mmci_callback(void *data)
101 {
102 struct mmci_card_event *mmci_card = data;
103
104 disable_irq_on_gpio_pin(U300_GPIO_PIN_MMC_CD);
105 schedule_work(&mmci_card->workq);
106
107 return 0;
108 }
109
110
111 static ssize_t gpio_show(struct device *dev, struct device_attribute *attr,
112 char *buf)
113 {
114 struct mmci_card_event *mmci_card = container_of(
115 dev->platform_data,
116 struct mmci_card_event, mmc0_plat_data);
117
118
119 return sprintf(buf, "%d\n", !mmci_card->mmc_inserted);
120 }
121
122 static DEVICE_ATTR(mmc_inserted, S_IRUGO, gpio_show, NULL);
123
124 static void _mmci_callback(struct work_struct *ws)
125 {
126
127 struct mmci_card_event *mmci_card = container_of(
128 ws,
129 struct mmci_card_event, workq);
130
131 mdelay(20);
132
133 mmci_card->mmc_inserted = !!gpio_get_value(U300_GPIO_PIN_MMC_CD);
134
135 input_report_switch(mmci_card->mmc_input, KEY_INSERT,
136 !mmci_card->mmc_inserted);
137 input_sync(mmci_card->mmc_input);
138
139 pr_debug("MMC/SD card was %s\n",
140 mmci_card->mmc_inserted ? "removed" : "inserted");
141
142 enable_irq_on_gpio_pin(U300_GPIO_PIN_MMC_CD, !mmci_card->mmc_inserted);
143 }
144
145 int __devinit mmc_init(struct amba_device *adev)
146 {
147 struct mmci_card_event *mmci_card;
148 struct device *mmcsd_device = &adev->dev;
149 int ret = 0;
150
151 mmci_card = kzalloc(sizeof(struct mmci_card_event), GFP_KERNEL);
152 if (!mmci_card)
153 return -ENOMEM;
154
155 /* Nominally 2.85V on our platform */
156 mmci_card->mmc0_plat_data.ocr_mask = MMC_VDD_28_29;
157 mmci_card->mmc0_plat_data.translate_vdd = mmc_translate_vdd;
158 mmci_card->mmc0_plat_data.status = mmc_status;
159
160 mmcsd_device->platform_data = (void *) &mmci_card->mmc0_plat_data;
161
162 INIT_WORK(&mmci_card->workq, _mmci_callback);
163
164 ret = gpio_request(U300_GPIO_PIN_MMC_CD, "MMC card detection");
165 if (ret) {
166 printk(KERN_CRIT "Could not allocate MMC card detection " \
167 "GPIO pin\n");
168 goto out;
169 }
170
171 ret = gpio_direction_input(U300_GPIO_PIN_MMC_CD);
172 if (ret) {
173 printk(KERN_CRIT "Invalid GPIO pin requested\n");
174 goto out;
175 }
176
177 ret = sysfs_create_file(&mmcsd_device->kobj,
178 &dev_attr_mmc_inserted.attr);
179 if (ret)
180 goto out;
181
182 mmci_card->mmc_input = input_allocate_device();
183 if (!mmci_card->mmc_input) {
184 printk(KERN_CRIT "Could not allocate MMC input device\n");
185 return -ENOMEM;
186 }
187
188 mmci_card->mmc_input->name = "MMC insert notification";
189 mmci_card->mmc_input->id.bustype = BUS_HOST;
190 mmci_card->mmc_input->id.vendor = 0;
191 mmci_card->mmc_input->id.product = 0;
192 mmci_card->mmc_input->id.version = 0x0100;
193 mmci_card->mmc_input->dev.parent = mmcsd_device;
194 input_set_capability(mmci_card->mmc_input, EV_SW, KEY_INSERT);
195
196 /*
197 * Since this must always be compiled into the kernel, this input
198 * is never unregistered or free:ed.
199 */
200 ret = input_register_device(mmci_card->mmc_input);
201 if (ret) {
202 input_free_device(mmci_card->mmc_input);
203 goto out;
204 }
205
206 input_set_drvdata(mmci_card->mmc_input, mmci_card);
207
208 ret = gpio_register_callback(U300_GPIO_PIN_MMC_CD, mmci_callback,
209 mmci_card);
210
211 schedule_work(&mmci_card->workq);
212
213 printk(KERN_INFO "Registered MMC insert/remove notification\n");
214 out:
215 return ret;
216 }
217
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