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>
23 #include <asm/mach/mmc.h>
26 struct mmci_card_event {
27 struct input_dev *mmc_input;
29 struct work_struct workq;
30 struct mmc_platform_data mmc0_plat_data;
33 static unsigned int mmc_status(struct device *dev)
35 struct mmci_card_event *mmci_card = container_of(
37 struct mmci_card_event, mmc0_plat_data);
39 return mmci_card->mmc_inserted;
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.
47 static u32 mmc_translate_vdd(struct device *dev, unsigned int voltage)
54 * bit 8 - 14: 2.0 - 2.6V
55 * bit 15 - 23: 2.7 - 3.6V
94 /* PL180 voltage register bits */
100 static int mmci_callback(void *data)
102 struct mmci_card_event *mmci_card = data;
104 disable_irq_on_gpio_pin(U300_GPIO_PIN_MMC_CD);
105 schedule_work(&mmci_card->workq);
111 static ssize_t gpio_show(struct device *dev, struct device_attribute *attr,
114 struct mmci_card_event *mmci_card = container_of(
116 struct mmci_card_event, mmc0_plat_data);
119 return sprintf(buf, "%d\n", !mmci_card->mmc_inserted);
122 static DEVICE_ATTR(mmc_inserted, S_IRUGO, gpio_show, NULL);
124 static void _mmci_callback(struct work_struct *ws)
127 struct mmci_card_event *mmci_card = container_of(
129 struct mmci_card_event, workq);
133 mmci_card->mmc_inserted = !!gpio_get_value(U300_GPIO_PIN_MMC_CD);
135 input_report_switch(mmci_card->mmc_input, KEY_INSERT,
136 !mmci_card->mmc_inserted);
137 input_sync(mmci_card->mmc_input);
139 pr_debug("MMC/SD card was %s\n",
140 mmci_card->mmc_inserted ? "removed" : "inserted");
142 enable_irq_on_gpio_pin(U300_GPIO_PIN_MMC_CD, !mmci_card->mmc_inserted);
145 int __devinit mmc_init(struct amba_device *adev)
147 struct mmci_card_event *mmci_card;
148 struct device *mmcsd_device = &adev->dev;
151 mmci_card = kzalloc(sizeof(struct mmci_card_event), GFP_KERNEL);
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;
160 mmcsd_device->platform_data = (void *) &mmci_card->mmc0_plat_data;
162 INIT_WORK(&mmci_card->workq, _mmci_callback);
164 ret = gpio_request(U300_GPIO_PIN_MMC_CD, "MMC card detection");
166 printk(KERN_CRIT "Could not allocate MMC card detection " \
171 ret = gpio_direction_input(U300_GPIO_PIN_MMC_CD);
173 printk(KERN_CRIT "Invalid GPIO pin requested\n");
177 ret = sysfs_create_file(&mmcsd_device->kobj,
178 &dev_attr_mmc_inserted.attr);
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");
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);
197 * Since this must always be compiled into the kernel, this input
198 * is never unregistered or free:ed.
200 ret = input_register_device(mmci_card->mmc_input);
202 input_free_device(mmci_card->mmc_input);
206 input_set_drvdata(mmci_card->mmc_input, mmci_card);
208 ret = gpio_register_callback(U300_GPIO_PIN_MMC_CD, mmci_callback,
211 schedule_work(&mmci_card->workq);
213 printk(KERN_INFO "Registered MMC insert/remove notification\n");