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
  29 static struct physmap_flash_data physmap_flash_data = {
  30         .width          = 1,
  31 };
  32
  33 static struct resource physmap_flash_resource = {
  34         .start          = 0xFFF80000,
  35         .end            = 0xFFFFFFFF,
  36         .flags          = IORESOURCE_MEM,
  37 };
  38
  39 static 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
  52 static 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 };
  58
  59 static struct gpio_keys_button nb0916_gpio_keys[] = {
  60         {
  61                 .type   = EV_KEY,
  62                 .code   = KEY_POWER,
  63                 .gpio   = GPI_SOFF_REQ,
  64                 .desc   = "Power Button",
  65                 .wakeup = 1,
  66                 .active_low = 1,
  67         },
  68         {
  69                 .type   = EV_KEY,
  70                 .code   = BTN_TOUCH,
  71                 .gpio   = GPI_BTN_TOUCH,
  72                 .desc   = "Touchpad Button",
  73                 .wakeup = 1,
  74                 .active_low = 1,
  75         },
  76 };
  77
  78 static struct gpio_keys_platform_data nb0916_gpio_button_data = {
  79         .buttons        = nb0916_gpio_keys,
  80         .nbuttons       = ARRAY_SIZE(nb0916_gpio_keys),
  81 };
  82
  83 static irqreturn_t nb0916_lcdcaseoff_handler(int irq, void *dev_id)
  84 {
  85         if (gpio_get_value(GPI_LCD_CASE_OFF))
  86                 gpio_set_value(GPO_LCD_EN, 1);
  87         else
  88                 gpio_set_value(GPO_LCD_EN, 0);
  89
  90         return IRQ_HANDLED;
  91 }
  92
  93 static irqreturn_t nb0916_overheat_handler(int irq, void *dev_id)
  94 {
  95         machine_halt();
  96         /* SYSTEM HALT, NO RETURN */
  97         return IRQ_HANDLED;
  98 }
  99
 100 static struct i2c_board_info __initdata puv3_i2c_devices[] = {
 101         {       I2C_BOARD_INFO("lm75",          I2C_TAR_THERMAL),       },
 102         {       I2C_BOARD_INFO("bq27200",       I2C_TAR_PWIC),          },
 103         {       I2C_BOARD_INFO("24c02",         I2C_TAR_EEPROM),        },
 104 };
 105
 106 int __init mach_nb0916_init(void)
 107 {
 108         i2c_register_board_info(0, puv3_i2c_devices,
 109                         ARRAY_SIZE(puv3_i2c_devices));
 110
 111         platform_device_register_simple("PKUnity-v3-I2C", -1,
 112                         puv3_i2c_resources, ARRAY_SIZE(puv3_i2c_resources));
 113
 114         platform_device_register_data(&platform_bus, "pwm-backlight", -1,
 115                         &nb0916_backlight_data, sizeof(nb0916_backlight_data));
 116
 117         platform_device_register_data(&platform_bus, "gpio-keys", -1,
 118                         &nb0916_gpio_button_data, sizeof(nb0916_gpio_button_data));
 119
 120         platform_device_register_resndata(&platform_bus, "physmap-flash", -1,
 121                         &physmap_flash_resource, 1,
 122                         &physmap_flash_data, sizeof(physmap_flash_data));
 123
 124         if (request_irq(gpio_to_irq(GPI_LCD_CASE_OFF),
 125                 &nb0916_lcdcaseoff_handler,
 126                 IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
 127                 "NB0916 lcd case off", NULL) < 0) {
 128
 129                 printk(KERN_DEBUG "LCD-Case-OFF IRQ %d not available\n",
 130                         gpio_to_irq(GPI_LCD_CASE_OFF));
 131         }
 132
 133         if (request_irq(gpio_to_irq(GPI_OTP_INT), &nb0916_overheat_handler,
 134                 IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
 135                 "NB0916 overheating protection", NULL) < 0) {
 136
 137                 printk(KERN_DEBUG "Overheating Protection IRQ %d not available\n",
 138                         gpio_to_irq(GPI_OTP_INT));
 139         }
 140
 141         return 0;
 142 }
 143
 144 subsys_initcall_sync(mach_nb0916_init);