root/arch/unicore32/kernel/puv3-nb0916.c

DEFINITIONS

1. nb0916_lcdcaseoff_handler
2. nb0916_overheat_handler
3. mach_nb0916_init

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * linux/arch/unicore32/kernel/puv3-nb0916.c
   4  *
   5  * Code specific to PKUnity SoC and UniCore ISA
   6  *
   7  *      Maintained by GUAN Xue-tao <gxt@mprc.pku.edu.cn>
   8  *      Copyright (C) 2001-2010 Guan Xuetao
   9  */
  10 
  11 #include <linux/init.h>
  12 #include <linux/device.h>
  13 #include <linux/platform_device.h>
  14 #include <linux/mtd/physmap.h>
  15 #include <linux/io.h>
  16 #include <linux/reboot.h>
  17 #include <linux/interrupt.h>
  18 #include <linux/i2c.h>
  19 #include <linux/pwm.h>
  20 #include <linux/pwm_backlight.h>
  21 #include <linux/gpio.h>
  22 #include <linux/gpio_keys.h>
  23 #include <linux/input.h>
  24 
  25 #include <mach/hardware.h>
  26 
  27 static struct physmap_flash_data physmap_flash_data = {
  28         .width          = 1,
  29 };
  30 
  31 static struct resource physmap_flash_resource = {
  32         .start          = 0xFFF80000,
  33         .end            = 0xFFFFFFFF,
  34         .flags          = IORESOURCE_MEM,
  35 };
  36 
  37 static struct resource puv3_i2c_resources[] = {
  38         [0] = {
  39                 .start = io_v2p(PKUNITY_I2C_BASE),
  40                 .end   = io_v2p(PKUNITY_I2C_BASE) + 0xff,
  41                 .flags = IORESOURCE_MEM,
  42         },
  43         [1] = {
  44                 .start = IRQ_I2C,
  45                 .end   = IRQ_I2C,
  46                 .flags = IORESOURCE_IRQ,
  47         }
  48 };
  49 
  50 static struct pwm_lookup nb0916_pwm_lookup[] = {
  51         PWM_LOOKUP("PKUnity-v3-PWM", 0, "pwm-backlight", NULL, 70 * 1024,
  52                    PWM_POLARITY_NORMAL),
  53 };
  54 
  55 static struct platform_pwm_backlight_data nb0916_backlight_data = {
  56         .max_brightness = 100,
  57         .dft_brightness = 100,
  58         .enable_gpio    = -1,
  59 };
  60 
  61 static struct gpio_keys_button nb0916_gpio_keys[] = {
  62         {
  63                 .type   = EV_KEY,
  64                 .code   = KEY_POWER,
  65                 .gpio   = GPI_SOFF_REQ,
  66                 .desc   = "Power Button",
  67                 .wakeup = 1,
  68                 .active_low = 1,
  69         },
  70         {
  71                 .type   = EV_KEY,
  72                 .code   = BTN_TOUCH,
  73                 .gpio   = GPI_BTN_TOUCH,
  74                 .desc   = "Touchpad Button",
  75                 .wakeup = 1,
  76                 .active_low = 1,
  77         },
  78 };
  79 
  80 static struct gpio_keys_platform_data nb0916_gpio_button_data = {
  81         .buttons        = nb0916_gpio_keys,
  82         .nbuttons       = ARRAY_SIZE(nb0916_gpio_keys),
  83 };
  84 
  85 static irqreturn_t nb0916_lcdcaseoff_handler(int irq, void *dev_id)
  86 {
  87         if (gpio_get_value(GPI_LCD_CASE_OFF))
  88                 gpio_set_value(GPO_LCD_EN, 1);
  89         else
  90                 gpio_set_value(GPO_LCD_EN, 0);
  91 
  92         return IRQ_HANDLED;
  93 }
  94 
  95 static irqreturn_t nb0916_overheat_handler(int irq, void *dev_id)
  96 {
  97         machine_halt();
  98         /* SYSTEM HALT, NO RETURN */
  99         return IRQ_HANDLED;
 100 }
 101 
 102 static struct i2c_board_info __initdata puv3_i2c_devices[] = {
 103         {       I2C_BOARD_INFO("lm75",          I2C_TAR_THERMAL),       },
 104         {       I2C_BOARD_INFO("bq27200",       I2C_TAR_PWIC),          },
 105         {       I2C_BOARD_INFO("24c02",         I2C_TAR_EEPROM),        },
 106 };
 107 
 108 int __init mach_nb0916_init(void)
 109 {
 110         i2c_register_board_info(0, puv3_i2c_devices,
 111                         ARRAY_SIZE(puv3_i2c_devices));
 112 
 113         platform_device_register_simple("PKUnity-v3-I2C", -1,
 114                         puv3_i2c_resources, ARRAY_SIZE(puv3_i2c_resources));
 115 
 116         pwm_add_table(nb0916_pwm_lookup, ARRAY_SIZE(nb0916_pwm_lookup));
 117 
 118         platform_device_register_data(NULL, "pwm-backlight", -1,
 119                         &nb0916_backlight_data, sizeof(nb0916_backlight_data));
 120 
 121         platform_device_register_data(NULL, "gpio-keys", -1,
 122                         &nb0916_gpio_button_data, sizeof(nb0916_gpio_button_data));
 123 
 124         platform_device_register_resndata(NULL, "physmap-flash", -1,
 125                         &physmap_flash_resource, 1,
 126                         &physmap_flash_data, sizeof(physmap_flash_data));
 127 
 128         if (request_irq(gpio_to_irq(GPI_LCD_CASE_OFF),
 129                 &nb0916_lcdcaseoff_handler,
 130                 IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
 131                 "NB0916 lcd case off", NULL) < 0) {
 132 
 133                 printk(KERN_DEBUG "LCD-Case-OFF IRQ %d not available\n",
 134                         gpio_to_irq(GPI_LCD_CASE_OFF));
 135         }
 136 
 137         if (request_irq(gpio_to_irq(GPI_OTP_INT), &nb0916_overheat_handler,
 138                 IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
 139                 "NB0916 overheating protection", NULL) < 0) {
 140 
 141                 printk(KERN_DEBUG "Overheating Protection IRQ %d not available\n",
 142                         gpio_to_irq(GPI_OTP_INT));
 143         }
 144 
 145         return 0;
 146 }
 147 
 148 subsys_initcall_sync(mach_nb0916_init);