diff options
Diffstat (limited to 'arch/arm/mach-u300/mmc.c')
| -rw-r--r-- | arch/arm/mach-u300/mmc.c | 216 |
1 files changed, 216 insertions, 0 deletions
diff --git a/arch/arm/mach-u300/mmc.c b/arch/arm/mach-u300/mmc.c new file mode 100644 index 000000000000..3138d3955c9e --- /dev/null +++ b/arch/arm/mach-u300/mmc.c @@ -0,0 +1,216 @@ +/* + * + * arch/arm/mach-u300/mmc.c + * + * + * Copyright (C) 2009 ST-Ericsson AB + * License terms: GNU General Public License (GPL) version 2 + * + * Author: Linus Walleij <linus.walleij@stericsson.com> + * Author: Johan Lundin <johan.lundin@stericsson.com> + * Author: Jonas Aaberg <jonas.aberg@stericsson.com> + */ +#include <linux/device.h> +#include <linux/amba/bus.h> +#include <linux/mmc/host.h> +#include <linux/input.h> +#include <linux/workqueue.h> +#include <linux/delay.h> +#include <linux/regulator/consumer.h> +#include <linux/regulator/machine.h> +#include <linux/gpio.h> + +#include <asm/mach/mmc.h> +#include "mmc.h" + +struct mmci_card_event { + struct input_dev *mmc_input; + int mmc_inserted; + struct work_struct workq; + struct mmc_platform_data mmc0_plat_data; +}; + +static unsigned int mmc_status(struct device *dev) +{ + struct mmci_card_event *mmci_card = container_of( + dev->platform_data, + struct mmci_card_event, mmc0_plat_data); + + return mmci_card->mmc_inserted; +} + +/* + * Here follows a large chunk of code which will only be enabled if you + * have both the AB3100 chip mounted and the MMC subsystem activated. + */ + +static u32 mmc_translate_vdd(struct device *dev, unsigned int voltage) +{ + int v; + + /* + * MMC Spec: + * bit 7: 1.70 - 1.95V + * bit 8 - 14: 2.0 - 2.6V + * bit 15 - 23: 2.7 - 3.6V + * + * ab3100 voltages: + * 000 - 2.85V + * 001 - 2.75V + * 010 - 1.8V + * 011 - 1.5V + */ + switch (voltage) { + case 8: + v = 3; + break; + case 9: + case 10: + case 11: + case 12: + case 13: + case 14: + case 15: + v = 1; + break; + case 16: + v = 1; + break; + case 17: + case 18: + case 19: + case 20: + case 21: + case 22: + case 23: + case 24: + v = 0; + break; + default: + v = 0; + break; + } + + /* PL180 voltage register bits */ + return v << 2; +} + + + +static int mmci_callback(void *data) +{ + struct mmci_card_event *mmci_card = data; + + disable_irq_on_gpio_pin(U300_GPIO_PIN_MMC_CD); + schedule_work(&mmci_card->workq); + + return 0; +} + + +static ssize_t gpio_show(struct device *dev, struct device_attribute *attr, + char *buf) +{ + struct mmci_card_event *mmci_card = container_of( + dev->platform_data, + struct mmci_card_event, mmc0_plat_data); + + + return sprintf(buf, "%d\n", !mmci_card->mmc_inserted); +} + +static DEVICE_ATTR(mmc_inserted, S_IRUGO, gpio_show, NULL); + +static void _mmci_callback(struct work_struct *ws) +{ + + struct mmci_card_event *mmci_card = container_of( + ws, + struct mmci_card_event, workq); + + mdelay(20); + + mmci_card->mmc_inserted = !!gpio_get_value(U300_GPIO_PIN_MMC_CD); + + input_report_switch(mmci_card->mmc_input, KEY_INSERT, + !mmci_card->mmc_inserted); + input_sync(mmci_card->mmc_input); + + pr_debug("MMC/SD card was %s\n", + mmci_card->mmc_inserted ? "removed" : "inserted"); + + enable_irq_on_gpio_pin(U300_GPIO_PIN_MMC_CD, !mmci_card->mmc_inserted); +} + +int __devinit mmc_init(struct amba_device *adev) +{ + struct mmci_card_event *mmci_card; + struct device *mmcsd_device = &adev->dev; + int ret = 0; + + mmci_card = kzalloc(sizeof(struct mmci_card_event), GFP_KERNEL); + if (!mmci_card) + return -ENOMEM; + + /* Nominally 2.85V on our platform */ + mmci_card->mmc0_plat_data.ocr_mask = MMC_VDD_28_29; + mmci_card->mmc0_plat_data.translate_vdd = mmc_translate_vdd; + mmci_card->mmc0_plat_data.status = mmc_status; + + mmcsd_device->platform_data = (void *) &mmci_card->mmc0_plat_data; + + INIT_WORK(&mmci_card->workq, _mmci_callback); + + ret = gpio_request(U300_GPIO_PIN_MMC_CD, "MMC card detection"); + if (ret) { + printk(KERN_CRIT "Could not allocate MMC card detection " \ + "GPIO pin\n"); + goto out; + } + + ret = gpio_direction_input(U300_GPIO_PIN_MMC_CD); + if (ret) { + printk(KERN_CRIT "Invalid GPIO pin requested\n"); + goto out; + } + + ret = sysfs_create_file(&mmcsd_device->kobj, + &dev_attr_mmc_inserted.attr); + if (ret) + goto out; + + mmci_card->mmc_input = input_allocate_device(); + if (!mmci_card->mmc_input) { + printk(KERN_CRIT "Could not allocate MMC input device\n"); + return -ENOMEM; + } + + mmci_card->mmc_input->name = "MMC insert notification"; + mmci_card->mmc_input->id.bustype = BUS_HOST; + mmci_card->mmc_input->id.vendor = 0; + mmci_card->mmc_input->id.product = 0; + mmci_card->mmc_input->id.version = 0x0100; + mmci_card->mmc_input->dev.parent = mmcsd_device; + input_set_capability(mmci_card->mmc_input, EV_SW, KEY_INSERT); + + /* + * Since this must always be compiled into the kernel, this input + * is never unregistered or free:ed. + */ + ret = input_register_device(mmci_card->mmc_input); + if (ret) { + input_free_device(mmci_card->mmc_input); + goto out; + } + + input_set_drvdata(mmci_card->mmc_input, mmci_card); + + ret = gpio_register_callback(U300_GPIO_PIN_MMC_CD, mmci_callback, + mmci_card); + + schedule_work(&mmci_card->workq); + + printk(KERN_INFO "Registered MMC insert/remove notification\n"); +out: + return ret; +} |