LXR linux/arch/unicore32/kernel/puv3-nb0916.c

   1/*
   2 * linux/arch/unicore32/kernel/puv3-nb0916.c
   3 *
   4 * Code specific to PKUnity SoC and UniCore ISA
   5 *
   6 *      Maintained by GUAN Xue-tao <gxt@mprc.pku.edu.cn>
   7 *      Copyright (C) 2001-2010 Guan Xuetao
   8 *
   9 * This program is free software; you can redistribute it and/or modify
  10 * it under the terms of the GNU General Public License version 2 as
  11 * published by the Free Software Foundation.
  12 */
  13
  14#include <linux/init.h>
  15#include <linux/device.h>
  16#include <linux/platform_device.h>
  17#include <linux/mtd/physmap.h>
  18#include <linux/io.h>
  19#include <linux/reboot.h>
  20#include <linux/interrupt.h>
  21#include <linux/i2c.h>
  22#include <linux/pwm_backlight.h>
  23#include <linux/gpio.h>
  24#include <linux/gpio_keys.h>
  25#include <linux/input.h>
  26
  27#include <mach/hardware.h>
  28
  29static struct physmap_flash_data physmap_flash_data = {
  30        .width          = 1,
  31};
  32
  33static struct resource physmap_flash_resource = {
  34        .start          = 0xFFF80000,
  35        .end            = 0xFFFFFFFF,
  36        .flags          = IORESOURCE_MEM,
  37};
  38
  39static struct resource puv3_i2c_resources[] = {
  40        [0] = {
  41                .start = io_v2p(PKUNITY_I2C_BASE),
  42                .end   = io_v2p(PKUNITY_I2C_BASE) + 0xff,
  43                .flags = IORESOURCE_MEM,
  44        },
  45        [1] = {
  46                .start = IRQ_I2C,
  47                .end   = IRQ_I2C,
  48                .flags = IORESOURCE_IRQ,
  49        }
  50};
  51
  52static struct platform_pwm_backlight_data nb0916_backlight_data = {
  53        .pwm_id         = 0,
  54        .max_brightness = 100,
  55        .dft_brightness = 100,
  56        .pwm_period_ns  = 70 * 1024,
  57        .enable_gpio    = -1,
  58};
  59
  60static struct gpio_keys_button nb0916_gpio_keys[] = {
  61        {
  62                .type   = EV_KEY,
  63                .code   = KEY_POWER,
  64                .gpio   = GPI_SOFF_REQ,
  65                .desc   = "Power Button",
  66                .wakeup = 1,
  67                .active_low = 1,
  68        },
  69        {
  70                .type   = EV_KEY,
  71                .code   = BTN_TOUCH,
  72                .gpio   = GPI_BTN_TOUCH,
  73                .desc   = "Touchpad Button",
  74                .wakeup = 1,
  75                .active_low = 1,
  76        },
  77};
  78
  79static struct gpio_keys_platform_data nb0916_gpio_button_data = {
  80        .buttons        = nb0916_gpio_keys,
  81        .nbuttons       = ARRAY_SIZE(nb0916_gpio_keys),
  82};
  83
  84static irqreturn_t nb0916_lcdcaseoff_handler(int irq, void *dev_id)
  85{
  86        if (gpio_get_value(GPI_LCD_CASE_OFF))
  87                gpio_set_value(GPO_LCD_EN, 1);
  88        else
  89                gpio_set_value(GPO_LCD_EN, 0);
  90
  91        return IRQ_HANDLED;
  92}
  93
  94static irqreturn_t nb0916_overheat_handler(int irq, void *dev_id)
  95{
  96        machine_halt();
  97        /* SYSTEM HALT, NO RETURN */
  98        return IRQ_HANDLED;
  99}
 100
 101static struct i2c_board_info __initdata puv3_i2c_devices[] = {
 102        {       I2C_BOARD_INFO("lm75",          I2C_TAR_THERMAL),       },
 103        {       I2C_BOARD_INFO("bq27200",       I2C_TAR_PWIC),          },
 104        {       I2C_BOARD_INFO("24c02",         I2C_TAR_EEPROM),        },
 105};
 106
 107int __init mach_nb0916_init(void)
 108{
 109        i2c_register_board_info(0, puv3_i2c_devices,
 110                        ARRAY_SIZE(puv3_i2c_devices));
 111
 112        platform_device_register_simple("PKUnity-v3-I2C", -1,
 113                        puv3_i2c_resources, ARRAY_SIZE(puv3_i2c_resources));
 114
 115        platform_device_register_data(&platform_bus, "pwm-backlight", -1,
 116                        &nb0916_backlight_data, sizeof(nb0916_backlight_data));
 117
 118        platform_device_register_data(&platform_bus, "gpio-keys", -1,
 119                        &nb0916_gpio_button_data, sizeof(nb0916_gpio_button_data));
 120
 121        platform_device_register_resndata(&platform_bus, "physmap-flash", -1,
 122                        &physmap_flash_resource, 1,
 123                        &physmap_flash_data, sizeof(physmap_flash_data));
 124
 125        if (request_irq(gpio_to_irq(GPI_LCD_CASE_OFF),
 126                &nb0916_lcdcaseoff_handler,
 127                IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
 128                "NB0916 lcd case off", NULL) < 0) {
 129
 130                printk(KERN_DEBUG "LCD-Case-OFF IRQ %d not available\n",
 131                        gpio_to_irq(GPI_LCD_CASE_OFF));
 132        }
 133
 134        if (request_irq(gpio_to_irq(GPI_OTP_INT), &nb0916_overheat_handler,
 135                IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
 136                "NB0916 overheating protection", NULL) < 0) {
 137
 138                printk(KERN_DEBUG "Overheating Protection IRQ %d not available\n",
 139                        gpio_to_irq(GPI_OTP_INT));
 140        }
 141
 142        return 0;
 143}
 144
 145subsys_initcall_sync(mach_nb0916_init);
 146