path: root/arch/arm/mach-omap2/board-omap3h1.c

/*
 * Copyright (C) 2014 Olio Devices, Inc.
 * Authors: Evan Wilson <evan@oliodevices.com>
 *			Mattis Fjallstrom <mattis@oliodevices.com>
 *
 * Copyright (C) 2011 Texas Instruments Incorporated - http://www.ti.com/
 *
 * Modified from the original mach-omap/omap2/board-generic.c did by Paul
 * to support the OMAP2+ device tree boards with an unique board file.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/delay.h>
#include <linux/err.h>
#include <linux/clk.h>
#include <linux/io.h>
#include <linux/opp.h>
#include <linux/cpu.h>
#include <linux/mpu.h>
#include <linux/spi/spi.h>
#include <linux/mtd/mtd.h>
#include <linux/mtd/partitions.h>
#include <linux/mtd/nand.h>

#include <linux/usb/musb.h>
#include <linux/usb/phy.h>
#include <linux/usb/nop-usb-xceiv.h>

#include <linux/i2c/atmel_mxt_ts.h>
#include <linux/gpio.h>
#include <linux/gpio_keys.h>

#include <linux/regulator/machine.h>
#include <linux/regulator/fixed.h>
#include <linux/mfd/tps65910.h>

#include <linux/kmod.h> /* for call_usermodehelper - not used, remove? */
#include <linux/wakelock.h> /* used in interrupt, waking up.  */
#include <linux/debugfs.h>

#include <linux/led-lm3530.h>

#include <asm/mach-types.h>
#include <asm/mach/arch.h>
#include <asm/mach/map.h>
#include <asm/mach/flash.h>

#include <video/omapdss.h>
#include <video/omap-panel-data.h>
#include <linux/platform_data/mtd-nand-omap2.h>

#include "common.h"
#include "omap_device.h"
#include "gpmc.h"
#include "soc.h"
#include "mux.h"
#include "pm.h"
#include "board-flash.h"
#include "common-board-devices.h"
#include "board-omap3h1.h"

#define NAND_CS 0

#define MPUIRQ_GPIO 31
#define ON_OFF_BUTTON_GPIO 30
#define ATMEL_MXT_GPIO 105
#define USB_IRQ 124
#define USB_ON_ETK_D7 21

#if defined(CONFIG_MACH_OMAP3_H1_DVT1) || defined(CONFIG_MACH_OMAP3_H1_DVT2)
#define LCD_RESET_GPIO 94
#else 
#define LCD_RESET_GPIO 122
#endif

static struct accelerometer_wake {
  int awake;
  struct wake_lock lock;
  char lock_name[100];
  int user_pid;
} acc_wake;

static struct mtd_partition omap3h1_nand_partitions[] = {
	/* All the partition sizes are listed in terms of NAND block size */
	{
		.name		= "X-Loader",
		.offset		= 0,
		.size		= 4 * NAND_BLOCK_SIZE,
		.mask_flags	= MTD_WRITEABLE,	/* force read-only */
	},
	{
		.name		= "U-Boot",
		.offset		= MTDPART_OFS_APPEND,	/* Offset = 0x80000 */
		.size		= 15 * NAND_BLOCK_SIZE,
		.mask_flags	= MTD_WRITEABLE,	/* force read-only */
	},
	{
		.name		= "U-Boot Env",
		.offset		= MTDPART_OFS_APPEND,	/* Offset = 0x260000 */
		.size		= 1 * NAND_BLOCK_SIZE,
	},
	{
		.name		= "kernel",
		.offset		= MTDPART_OFS_APPEND,	/* Offset = 0x280000 */
		.size		= 40 * NAND_BLOCK_SIZE,
	},
	{
		.name		= "initramfs",
		.offset		= MTDPART_OFS_APPEND, 	/* Offset = 0xC80000 */
		.size		= 80 * NAND_BLOCK_SIZE,
	},
	{
		.name		= "ramdisk",
		.offset		= MTDPART_OFS_APPEND,	/* Offset = 0x1180000 */
		.size		= 40 * NAND_BLOCK_SIZE,
	},
	{
		.name		= "system",
		.offset		= MTDPART_OFS_APPEND,	/* Offset = 0x1680000 */
		.size		= 2000 * NAND_BLOCK_SIZE,
	},
	{
		.name		= "userdata",
		.offset		= MTDPART_OFS_APPEND,	/* Offset = 0x11180000 */
		.size		= MTDPART_SIZ_FULL,
	},
};

static struct omap_dss_device omap3h1_lcd_device = {
	.type				= OMAP_DISPLAY_TYPE_DPI,
	.name				= "olio_h1_panel",
	.driver_name 		= "ili9342_panel",
	.phy.dpi.data_lines = 18,
	.reset_gpio			= LCD_RESET_GPIO,
};

static struct omap_dss_device *omap3h1_dss_devices[] = {
		&omap3h1_lcd_device,
};

static struct omap_dss_board_info omap3h1_dss_data = {
	.num_devices 	= 1,
	.devices = omap3h1_dss_devices,
	.default_device = &omap3h1_lcd_device,
};

static struct spi_board_info omap3h1_spi_board_info[] __initdata = {
	{
		.modalias		= "ili9342-spi",
		.bus_num		= 1,
		.chip_select 	= 1,
		.max_speed_hz 	= 375000,
		.platform_data	= &omap3h1_lcd_device,
		.mode			= SPI_MODE_0,
	}
};

static int __init omap3h1_spi_init(void) {
	spi_register_board_info(omap3h1_spi_board_info,
			ARRAY_SIZE(omap3h1_spi_board_info));
	return 0;
}


/* 
 * int_config is interrupt config, INT_ENABLE register. To enable _all_ 
 * interrupts, set to 0x59. I think. --mfj
 * 
 * Level shifter seems to set power rail between two options - 1 means VDD.
 * (0 means VLogic, which I'm not sure what it is).
 */

static struct mpu_platform_data mpu_data = {
	.int_config  = 0x00,
	.level_shifter = 1,
	.orientation = {  0,  -1,  0,
					  -1,  0,  0,
					  0,  0,  1 },
};

static struct lm3530_platform_data omap3h1_backlight_platform_data = {
	.mode = LM3530_BL_MODE_MANUAL,
	//.als_input_mode = LM3530_INPUT_ALS1,
	.max_current = LM3530_FS_CURR_29mA,
	//.pwm_pol_hi = true,
	//.als_avrg_time = LM3530_ALS_AVRG_TIME_512ms,
	.brt_ramp_law = 0,
	.brt_ramp_fall = LM3530_RAMP_TIME_1s, /* LM3530_RAMP_TIME_1s, */
	.brt_ramp_rise = LM3530_RAMP_TIME_1s, /* LM3530_RAMP_TIME_1s, */
	//.als1_resistor_sel = LM3530_ALS_IMPD_13_53kOhm,
	//.als2_resistor_sel = LM3530_ALS_IMPD_Z,
	//.als_vmin = 730,	    /* mV */
	//.als_vmax = 10a20,	/* mV */
	.brt_val = 0x64,	/* initial brightness */
};



static struct mxt_platform_data mxt_data = {
    .irqflags	= IRQF_TRIGGER_FALLING,
}; 

static struct platform_device bcm20702_bluetooth_device = {
	.name = "bcm20702_bluetooth",
	.id   = -1,
 };

static struct platform_device omap3h1_dmic_codec = {
		.name = "dmic-codec",
		.id = -1,
};

/* --------------------------------------------------------------------------- */
/* Keys / buttons settings 
 */

static struct gpio_keys_button gpio_buttons[] = {
	{
        .code			= KEY_POWER, /* 26 */
		.gpio			= ON_OFF_BUTTON_GPIO,
		.desc			= "accelerometer",
		.wakeup			= 1,
	},
};

static struct gpio_keys_platform_data gpio_key_info = {
	.buttons	= gpio_buttons,
	.nbuttons	= ARRAY_SIZE(gpio_buttons),
};

static struct platform_device omap3h1_keys = {
	.name	= "gpio-keys",
	.id	= -1,
	.dev	= {
		.platform_data	= &gpio_key_info,
	},
};


/* --------------------------------------------------------------------------- */
/* USB settings 
 */

static struct omap_musb_board_data musb_board_data = {
	.interface_type		= MUSB_INTERFACE_ULPI,
	.mode   			= MUSB_OTG,
	.power	    		= 100,
};

static struct nop_usb_xceiv_platform_data nop_plat_data = {
   .type     = USB_PHY_TYPE_USB2,
   .clk_rate = 60000000, /* 60 MHz */
   .needs_vcc = 1,
   .needs_reset = 0,
};

static struct platform_device nop_phy_device = {
  .name = "nop_usb_xceiv",
  .id   = -1,
  .dev  = {
      .platform_data = &nop_plat_data,
  },
};


/* static struct usbhs_omap_platform_data usbhs_bdata __initdata = { */
/* 	.port_mode[0] = OMAP_EHCI_PORT_MODE_PHY, */
/* }; */


/* --------------------------------------------------------------------------- */
/* REGULATORS 
 */

static struct regulator_init_data omap3h1_vbat_data = {
    .constraints.always_on = true,
    .constraints.valid_modes_mask = REGULATOR_MODE_NORMAL | REGULATOR_MODE_STANDBY,
    .constraints.valid_ops_mask = REGULATOR_CHANGE_MODE | REGULATOR_CHANGE_STATUS,
};

static struct fixed_voltage_config omap3h1_vbat_pdata = {
	.supply_name	= "VBAT",
	.microvolts   	= 3800000,
	.init_data	    = &omap3h1_vbat_data,
	.gpio		    = -EINVAL,
};

static struct platform_device omap3h1_vbat = {
	.name	= "reg-fixed-voltage",
	.id		= -1,
	.dev = {
		.platform_data = &omap3h1_vbat_pdata,
	},
};


/* --------------------------------------------------------------------------- */

static struct regulator_init_data tps65910_dummy = {
	.supply_regulator = "VBAT",
    .constraints.always_on  = false,
    /* .constraints.valid_ops_mask = REGULATOR_CHANGE_STATUS, */
};

/* --------------------------------------------------------------------------- */

static struct regulator_consumer_supply tps65910_touch3_supply[] = {
    REGULATOR_SUPPLY("avdd", "2-004a"),
};

static struct regulator_init_data tps65910_touch3 = {
	.supply_regulator = "VBAT",
    .constraints = {
        .min_uV            = 3300000,
        .max_uV            = 3300000,
        .valid_modes_mask  = REGULATOR_MODE_NORMAL | REGULATOR_MODE_STANDBY,
        .valid_ops_mask    = REGULATOR_CHANGE_VOLTAGE | REGULATOR_CHANGE_STATUS 
                             | REGULATOR_CHANGE_MODE,
        .always_on         = true,
        .apply_uV		   = true,
    },
    .num_consumer_supplies = ARRAY_SIZE(tps65910_touch3_supply),
    .consumer_supplies     = tps65910_touch3_supply,
};

/* --------------------------------------------------------------------------- */

static struct regulator_consumer_supply tps65910_vibrator_supply[] = {
      REGULATOR_SUPPLY("vaux2", "drv2605"),
};

static struct regulator_init_data tps65910_vibrator = {
	.supply_regulator = "VBAT",
    .constraints = {
        .min_uV            = 3300000,
        .max_uV            = 3300000,
        .valid_modes_mask  = REGULATOR_MODE_NORMAL | REGULATOR_MODE_STANDBY,
        .valid_ops_mask    = REGULATOR_CHANGE_VOLTAGE | 
                             REGULATOR_CHANGE_MODE |
                             REGULATOR_CHANGE_STATUS,
        .always_on         = true,
        .apply_uV		   = true,
    },
    .num_consumer_supplies = ARRAY_SIZE(tps65910_vibrator_supply),
    .consumer_supplies     = tps65910_vibrator_supply,
};



/* --------------------------------------------------------------------------- */


static struct regulator_init_data tps65910_3v3 = {
	.supply_regulator = "VBAT",
    .constraints = {
        .min_uV            = 3300000,
        .max_uV            = 3300000,
        .valid_modes_mask  = REGULATOR_MODE_NORMAL | REGULATOR_MODE_STANDBY,
        .valid_ops_mask    = REGULATOR_CHANGE_VOLTAGE | 
                             REGULATOR_CHANGE_MODE    | 
                             REGULATOR_CHANGE_STATUS,
        .always_on         = true,
        .apply_uV		   = true,
    },
};


/* --------------------------------------------------------------------------- */
/* This regulator must not be allowed to change status, doing so causes       
 * reboots to fail. Not sure why that is. --mfj
 */

static struct regulator_consumer_supply tps65910_1v8_supply[] = {
    REGULATOR_SUPPLY("vdds_dsi", "omapdss"),
    REGULATOR_SUPPLY("vin", "2-0038"),
};

static struct regulator_init_data tps65910_1v8 = {
	.supply_regulator = "VBAT",
    .constraints = {
        .min_uV            = 1800000,
        .max_uV            = 1800000,
        .valid_modes_mask  = REGULATOR_MODE_NORMAL | REGULATOR_MODE_STANDBY,
        .valid_ops_mask    = REGULATOR_CHANGE_VOLTAGE | REGULATOR_CHANGE_MODE,
        .always_on         = false,
        .apply_uV		   = true,
    },
    .num_consumer_supplies = ARRAY_SIZE(tps65910_1v8_supply),
    .consumer_supplies     = tps65910_1v8_supply,
};

/* --------------------------------------------------------------------------- */

static struct regulator_consumer_supply tps65910_vpll_supply[] = {
  };

static struct regulator_init_data tps65910_vpll = {
	.supply_regulator = "VBAT",
    .constraints = {
        .min_uV            = 1800000,
        .max_uV            = 1800000,
        .valid_modes_mask  = REGULATOR_MODE_NORMAL | REGULATOR_MODE_STANDBY, 
        .valid_ops_mask    = REGULATOR_CHANGE_VOLTAGE | REGULATOR_CHANGE_MODE | REGULATOR_CHANGE_STATUS,
        .always_on         = false,
        .apply_uV		   = true,
    },
    .num_consumer_supplies = ARRAY_SIZE(tps65910_vpll_supply),
    .consumer_supplies     = tps65910_vpll_supply,
};


/* --------------------------------------------------------------------------- */

static struct regulator_consumer_supply tps65910_touch_supply[] = {
    REGULATOR_SUPPLY("vdd", "2-004a" ),
};

static struct regulator_init_data tps65910_touch = {
	.supply_regulator = "VBAT",
    .constraints = {
        .min_uV            = 1800000,
        .max_uV            = 1800000,
        .valid_modes_mask  = REGULATOR_MODE_NORMAL | REGULATOR_MODE_STANDBY,
        .valid_ops_mask    = REGULATOR_CHANGE_VOLTAGE | REGULATOR_CHANGE_MODE | REGULATOR_CHANGE_STATUS,
        .always_on         = false,
        .apply_uV		   = true,
    },
    .num_consumer_supplies = ARRAY_SIZE(tps65910_touch_supply),
    .consumer_supplies     = tps65910_touch_supply,
};


/* --------------------------------------------------------------------------- */

/* This one only works if 'always_on' is set to true. Do I need to do something
 * special otherwise to turn it on? 
 */

static struct regulator_consumer_supply tps65910_accel_supply[] = {
     REGULATOR_SUPPLY("vdd", "mpu6515"),
};

static struct regulator_init_data tps65910_accel = {
	.supply_regulator = "VBAT",
    .constraints = {
        .min_uV            = 1800000,
        .max_uV            = 1800000,
        .valid_modes_mask  = REGULATOR_MODE_NORMAL | REGULATOR_MODE_STANDBY,
        .valid_ops_mask    = REGULATOR_CHANGE_MODE | REGULATOR_CHANGE_VOLTAGE | REGULATOR_CHANGE_STATUS,
        .always_on         = true,
        .apply_uV		   = true,
    },
    .num_consumer_supplies = ARRAY_SIZE(tps65910_accel_supply),
    .consumer_supplies     = tps65910_accel_supply,
};

/* --------------------------------------------------------------------------- */

static struct regulator_consumer_supply tps65910_vdd1_supply[] = {
    REGULATOR_SUPPLY("vcc", "cpu0"),
};

static struct regulator_init_data tps65910_vdd1 = {
	.supply_regulator = "VBAT",
    .constraints = {
        .name              = "vdd_mpu",
        .min_uV            = 900000,
        .max_uV            = 1350000,
        .valid_modes_mask  = REGULATOR_MODE_NORMAL | REGULATOR_MODE_STANDBY,
        .valid_ops_mask    = REGULATOR_CHANGE_VOLTAGE | REGULATOR_CHANGE_MODE | REGULATOR_CHANGE_STATUS,
        .always_on         = false,
    },
    .num_consumer_supplies = ARRAY_SIZE(tps65910_vdd1_supply),
    .consumer_supplies     = tps65910_vdd1_supply,
};

/* --------------------------------------------------------------------------- */

static struct regulator_consumer_supply tps65910_vdd2_supply[] = {
    REGULATOR_SUPPLY("vcc", "l3_main.0"),
};

static struct regulator_init_data tps65910_vdd2 = {
	.supply_regulator = "VBAT",
    .constraints = {
        .name              = "vdd_core",
        .min_uV            = 900000,
        .max_uV            = 1200000,
        .valid_modes_mask  = REGULATOR_MODE_NORMAL | REGULATOR_MODE_STANDBY,
        .valid_ops_mask    = REGULATOR_CHANGE_VOLTAGE | REGULATOR_CHANGE_MODE | REGULATOR_CHANGE_STATUS,
        .always_on         = false,
    },
    .num_consumer_supplies = ARRAY_SIZE(tps65910_vdd2_supply),
    .consumer_supplies     = tps65910_vdd2_supply,
};

/* --------------------------------------------------------------------------- */

static struct tps65910_board omap3h1_tps65910_pdata = {
	.irq = 7 + OMAP_INTC_START,
	.en_ck32k_xtal = true,

    .tps65910_pmic_init_data[TPS65910_REG_VIO]      = &tps65910_1v8,
    .tps65910_pmic_init_data[TPS65910_REG_VDD1]     = &tps65910_vdd1,
    .tps65910_pmic_init_data[TPS65910_REG_VDD2]     = &tps65910_vdd2,
    .tps65910_pmic_init_data[TPS65910_REG_VDIG1]    = &tps65910_accel,
    .tps65910_pmic_init_data[TPS65910_REG_VDIG2]    = &tps65910_touch,
    .tps65910_pmic_init_data[TPS65910_REG_VPLL]     = &tps65910_vpll,

    .tps65910_pmic_init_data[TPS65910_REG_VMMC]     = &tps65910_touch3,
    .tps65910_pmic_init_data[TPS65910_REG_VAUX2]    = &tps65910_vibrator,
    
    /* This one is connected to BT */
    
    .tps65910_pmic_init_data[TPS65910_REG_VAUX33]   = &tps65910_3v3,

    /* not actually used */

    .tps65910_pmic_init_data[TPS65910_REG_VRTC]     = &tps65910_dummy,
    .tps65910_pmic_init_data[TPS65910_REG_VDAC]     = &tps65910_dummy,
    .tps65910_pmic_init_data[TPS65910_REG_VAUX1]    = &tps65910_dummy, /* 2v85 */
    .tps65910_pmic_init_data[TPS65910_REG_VDD3]     = &tps65910_dummy,
    
    .pm_off = true,
};


/* ====================================================================== */
/* Voltage domain settings  */


#define OMAP3_SRI2C_SLAVE_ADDR		0x12
#define OMAP3_VDD_MPU_SR_CONTROL_REG	0x00
#define OMAP3_VDD_CORE_SR_CONTROL_REG	0x01
#define OMAP3_VP_CONFIG_ERROROFFSET	0x00
#define OMAP3_VP_VSTEPMIN_VSTEPMIN	0x1
#define OMAP3_VP_VSTEPMAX_VSTEPMAX	0x04
#define OMAP3_VP_VLIMITTO_TIMEOUT_US	200


static unsigned long olio_vsel_to_uv(const u8 vsel)
{
	return (((vsel * 125) + 6000)) * 100;
}

static u8 olio_uv_to_vsel(unsigned long uv)
{
	return DIV_ROUND_UP(uv - 600000, 12500);
}


static struct omap_voltdm_pmic omap3_mpu_pmic = {
	.slew_rate		= 4000,
	.step_size		= 12500,
	.vp_erroroffset		= OMAP3_VP_CONFIG_ERROROFFSET,
	.vp_vstepmin		= OMAP3_VP_VSTEPMIN_VSTEPMIN,
	.vp_vstepmax		= OMAP3_VP_VSTEPMAX_VSTEPMAX,
	.vddmin			= 900000,
	.vddmax			= 1350000,
	.vp_timeout_us		= OMAP3_VP_VLIMITTO_TIMEOUT_US,
	.i2c_slave_addr		= OMAP3_SRI2C_SLAVE_ADDR,
	.volt_reg_addr		= OMAP3_VDD_MPU_SR_CONTROL_REG,
	.i2c_high_speed		= true,
	.vsel_to_uv		= olio_vsel_to_uv,
	.uv_to_vsel		= olio_uv_to_vsel,
};

static struct omap_voltdm_pmic omap3_core_pmic = {
	.slew_rate		= 4000,
	.step_size		= 12500,
	.vp_erroroffset		= OMAP3_VP_CONFIG_ERROROFFSET,
	.vp_vstepmin		= OMAP3_VP_VSTEPMIN_VSTEPMIN,
	.vp_vstepmax		= OMAP3_VP_VSTEPMAX_VSTEPMAX,
	.vddmin			= 900000,
	.vddmax			= 1200000,
	.vp_timeout_us		= OMAP3_VP_VLIMITTO_TIMEOUT_US,
	.i2c_slave_addr		= OMAP3_SRI2C_SLAVE_ADDR,
	.volt_reg_addr		= OMAP3_VDD_CORE_SR_CONTROL_REG,
	.i2c_high_speed		= true,
	.vsel_to_uv		= olio_vsel_to_uv,
	.uv_to_vsel		= olio_uv_to_vsel,
};

int __init omap3_voltdm_init(void)
{
	struct voltagedomain *voltdm;

	if (!cpu_is_omap34xx())
		return -ENODEV;

	voltdm = voltdm_lookup("mpu_iva");
	omap_voltage_register_pmic(voltdm, &omap3_mpu_pmic);

	voltdm = voltdm_lookup("core");
	omap_voltage_register_pmic(voltdm, &omap3_core_pmic);

	return 0;
}



/* ====================================================================== */


static struct i2c_board_info __initdata omap3h1_i2c1_board_info[] = {
         {
            I2C_BOARD_INFO("tps65910", 0x2d),
            .platform_data = &omap3h1_tps65910_pdata,
         },
#ifdef CONFIG_MACH_OMAP3_H1_DVT2
};
static struct i2c_board_info __initdata omap3h1_i2c2_board_info[] = {
#endif
         {
            I2C_BOARD_INFO("mpu6515", 0x68),
            // This is needed for the interrupt wake. IH_GPIO_BASE changed in 3.10 
            // .irq = (IH_GPIO_BASE + MPUIRQ_GPIO),
            .platform_data = &mpu_data,
         },
         { 
            /* Backlight */
            I2C_BOARD_INFO("lm3530-led", 0x38),
            .platform_data = &omap3h1_backlight_platform_data,
    	 },
         {
            I2C_BOARD_INFO("mXT224", 0x4a),
            .platform_data = &mxt_data,
         },
#ifdef CONFIG_MACH_OMAP3_H1_EVT1
};
static struct i2c_board_info __initdata omap3h1_i2c3_board_info[] = {
#endif
         {
            I2C_BOARD_INFO("bq274xx", 0x55),
         },
};

/* --------------------------------------------------------------------------- */
/* Create debugfs entry 
 * 
 * We need to have this so that our wake-up thread can tell us it's PID. 
 * That PID will then be used when waking the system up.
 */


struct dentry * pidfile;

#define SIG_OLIO_WAKE 44	// we choose 44 as our signal number (real-time signals are in the range of 33 to 64)

static ssize_t write_pid(struct file *file, 
                         const char __user *buf,
                         size_t count, 
                         loff_t *ppos)
{
	char mybuf[10];
	int pid = 0;

	/* read the value from user space */

	if(count > 10)
      return -EINVAL;
	if (copy_from_user(mybuf, buf, count) != 0) {
      /* nothing read?? */
      printk ("OLIO: write_pid: Error??\n");
      return 0;
    }

	sscanf(mybuf, "%d", &pid);
	
    printk("pid read = %d\n", pid);
    
    acc_wake.user_pid = pid;

	return count;
}

static ssize_t send_wake_signal (void) {
    int ret;
	struct siginfo info;
	struct task_struct *t;

	/* send the signal */

    printk ("Now sending signal!\n");

	memset(&info, 0, sizeof(struct siginfo));

    /* this is bit of a trickery: SI_QUEUE is normally used by sigqueue from user space,
     * and kernel space should use SI_KERNEL. But if SI_KERNEL is used the real_time data 
     * is not delivered to the user space signal handler function. 
     */

	info.si_signo = SIG_OLIO_WAKE;
	info.si_code  = SI_QUEUE;

  	/* real time signals may have 32 bits of data. */

	info.si_int = 1234;

	rcu_read_lock();

	t = pid_task(find_pid_ns(acc_wake.user_pid, &init_pid_ns), PIDTYPE_PID);	

	if(t == NULL){
        rcu_read_unlock();
		printk("no such pid\n");
		return -ENODEV;
	}

    rcu_read_unlock();

    /* send the signal */

	ret = send_sig_info(SIG_OLIO_WAKE, &info, t);

	if (ret < 0) {
		printk("error sending signal\n");
	}
    return ret;
}

static const struct file_operations h1_fops = {
    .write = write_pid,
};



/***************************************************************************
 * acc_irq_handler - handle interrupt from accelerometer
 * 
 * This routine gets called when an interrupt from the accelerometer 
 * happens. Time out is in milliseconds.
 * 
 * TODO: BREAK this all out, place it in it's own kernel driver together
 * with the configuration stuff for the accelerometer (the low power sleep 
 * mode stuff).
 */

#define OLIO_DOUBLE_TAP 500
#define OLIO_ONE_SECOND 1000
#define OLIO_DT_WAIT 3000

static unsigned long previous;
static unsigned long previous_double;

static irqreturn_t acc_irq_handler_thr(int irq, void * omap3h1_d) {
  /* struct platform_device** omap3h1_devs = (struct platform_device **) omap3h1_d; */

  int ret = 99;
  unsigned long now;

  printk (KERN_DEBUG "acc_irq_handler_thr: Entered!\n");

  now = jiffies;

  if (jiffies_to_msecs(now - previous) < OLIO_DOUBLE_TAP) {

    /* ignore double clicks that happens too soon from the previous one */
    if (jiffies_to_msecs (now - previous_double) < OLIO_DT_WAIT)
    {
      previous = 0;
      return IRQ_HANDLED;
    }

    printk (KERN_DEBUG "Double tap detected!\n");

    /* We want to wake up. Take wake lock (and send signal to user space?)
     * BT driver only takes wake lock, then lets higher levels handle 
     * everything ... but what if there's nothing there to take the lock?
     */

    send_wake_signal();    
    wake_lock_timeout (&acc_wake.lock, msecs_to_jiffies (2 * OLIO_ONE_SECOND));
    
    previous_double = now;
    previous = 0;
  } else {
    previous = now;
  }

  printk (KERN_DEBUG "acc_irq_handler_thr: Leaving! (ret = %d)\n", ret);

  return IRQ_HANDLED;
}

static irqreturn_t acc_irq_handler(int irq, void * omap3h1_d) {
  printk (KERN_DEBUG "acc_irq_handler: Entered!\n");
  
  /* nothing to do, other than wake the main thread */
  
  printk (KERN_DEBUG "acc_irq_handler: Leaving!\n");
  return IRQ_WAKE_THREAD;
}

static int __init omap3_acc_irq_init (int irq, void * dev_id) {
    irq_set_irq_wake(irq, 1);

    if (request_threaded_irq (irq, acc_irq_handler, 
                              acc_irq_handler_thr, 0x81, "acc_wake", 
                              dev_id)) {
      printk (KERN_DEBUG "Couldn't register handler for accelerometer IRQ\n");
    }

    /* Should check the return value ... but if it fails, what do we do? */
    
    return 0;
}



/***************************************************************************
 * omap3_h1_i2c_init - init the i2c buses 
 *
 */

static int __init omap3_h1_i2c_init(void)
{
    int acc_irq;

  /* In Linux 3.10 we need to request an IRQ through 
   * gpio_to_irq. This means it can't be set at compile time, and
   * must be done at runtime. In other words, here.
   */

	gpio_request_one(ATMEL_MXT_GPIO, GPIOF_IN, "atmel_mxt_ts CHG");
	gpio_request_one(MPUIRQ_GPIO, GPIOF_IN, "mpu6515 IRQ pin");

    acc_irq = gpio_to_irq(MPUIRQ_GPIO);

#ifdef CONFIG_MACH_OMAP3_H1_DVT2
	omap3h1_i2c2_board_info[2].irq = gpio_to_irq(ATMEL_MXT_GPIO);
    omap3h1_i2c2_board_info[0].irq = acc_irq;
#else
	omap3h1_i2c1_board_info[3].irq = gpio_to_irq(ATMEL_MXT_GPIO);
    omap3h1_i2c1_board_info[1].irq = acc_irq;
#endif

	gpio_request_one(USB_ON_ETK_D7, GPIOF_OUT_INIT_HIGH, "USB on");
    
    /* Register buses */

	omap_register_i2c_bus(1, 400, omap3h1_i2c1_board_info, ARRAY_SIZE(omap3h1_i2c1_board_info));
#ifdef CONFIG_MACH_OMAP3_H1_DVT2
	omap_register_i2c_bus(2, 400, omap3h1_i2c2_board_info, ARRAY_SIZE(omap3h1_i2c2_board_info));
#else
	omap_register_i2c_bus(2, 400, NULL, 0);
#endif
#ifdef CONFIG_MACH_OMAP3_H1_EVT1
	omap_register_i2c_bus(3, 400, omap3h1_i2c3_board_info, ARRAY_SIZE(omap3h1_i2c3_board_info));
#else
	omap_register_i2c_bus(3, 400, NULL, 0);
#endif
	return 0;
}

static struct platform_device *omap3h1_devices[] __initdata = {
		&omap3h1_vbat,
        &bcm20702_bluetooth_device,
        &nop_phy_device,
		&omap3h1_dmic_codec,
        &omap3h1_keys,
};

#ifdef CONFIG_OMAP_MUX
static struct omap_board_mux board_mux[] __initdata = {

#if defined(CONFIG_MACH_OMAP3_H1_DVT1) || defined(CONFIG_MACH_OMAP3_H1_DVT2)
	OMAP3_MUX(CAM_HS, OMAP_MUX_MODE4 | OMAP_PIN_OUTPUT),
#else
	OMAP3_MUX(HSUSB0_DIR, OMAP_MUX_MODE4 | OMAP_PIN_OUTPUT),
#endif
	OMAP3_MUX(DSS_PCLK, OMAP_MUX_MODE0 | OMAP_PIN_OUTPUT),
	OMAP3_MUX(DSS_HSYNC, OMAP_MUX_MODE0 | OMAP_PIN_OUTPUT),
	OMAP3_MUX(DSS_VSYNC, OMAP_MUX_MODE0 | OMAP_PIN_OUTPUT),
	OMAP3_MUX(DSS_DATA0, OMAP_MUX_MODE0 | OMAP_PIN_OUTPUT),
	OMAP3_MUX(DSS_DATA1, OMAP_MUX_MODE0 | OMAP_PIN_OUTPUT),
	OMAP3_MUX(DSS_DATA2, OMAP_MUX_MODE0 | OMAP_PIN_OUTPUT),
	OMAP3_MUX(DSS_DATA3, OMAP_MUX_MODE0 | OMAP_PIN_OUTPUT),
	OMAP3_MUX(DSS_DATA4, OMAP_MUX_MODE0 | OMAP_PIN_OUTPUT),
	OMAP3_MUX(DSS_DATA5, OMAP_MUX_MODE0 | OMAP_PIN_OUTPUT),
	OMAP3_MUX(DSS_DATA6, OMAP_MUX_MODE0 | OMAP_PIN_OUTPUT),
	OMAP3_MUX(DSS_DATA7, OMAP_MUX_MODE0 | OMAP_PIN_OUTPUT),
	OMAP3_MUX(DSS_DATA8, OMAP_MUX_MODE0 | OMAP_PIN_OUTPUT),
	OMAP3_MUX(DSS_DATA9, OMAP_MUX_MODE0 | OMAP_PIN_OUTPUT),
	OMAP3_MUX(DSS_DATA10, OMAP_MUX_MODE0 | OMAP_PIN_OUTPUT),
	OMAP3_MUX(DSS_DATA11, OMAP_MUX_MODE0 | OMAP_PIN_OUTPUT),
	OMAP3_MUX(DSS_DATA12, OMAP_MUX_MODE0 | OMAP_PIN_OUTPUT),
	OMAP3_MUX(DSS_DATA13, OMAP_MUX_MODE0 | OMAP_PIN_OUTPUT),
	OMAP3_MUX(DSS_DATA14, OMAP_MUX_MODE0 | OMAP_PIN_OUTPUT),
	OMAP3_MUX(DSS_DATA15, OMAP_MUX_MODE0 | OMAP_PIN_OUTPUT),
	OMAP3_MUX(DSS_DATA16, OMAP_MUX_MODE0 | OMAP_PIN_OUTPUT),
	OMAP3_MUX(DSS_DATA17, OMAP_MUX_MODE0 | OMAP_PIN_OUTPUT),

	OMAP3_MUX(MCSPI1_CLK, OMAP_MUX_MODE0 | OMAP_PIN_OUTPUT),
	OMAP3_MUX(MCSPI1_SIMO, OMAP_MUX_MODE0 | OMAP_PIN_OUTPUT),
	OMAP3_MUX(MCSPI1_SOMI, OMAP_MUX_MODE0 | OMAP_PIN_INPUT_PULLUP),
	OMAP3_MUX(MCSPI1_CS1, OMAP_MUX_MODE0 | OMAP_PIN_OUTPUT),

	/* TOUCH_RESET */

	OMAP3_MUX(CAM_D6, OMAP_MUX_MODE4 | OMAP_PIN_INPUT_PULLUP),

#if defined(CONFIG_MACH_OMAP3_H1_DVT1) || defined(CONFIG_MACH_OMAP3_H1_DVT2)
    /* USB pin settings (mUSB) */

    OMAP3_MUX(HSUSB0_CLK,   (OMAP_MUX_MODE0 | OMAP_PIN_INPUT)),
    OMAP3_MUX(HSUSB0_DATA0, (OMAP_MUX_MODE0 | OMAP_PIN_INPUT)),
    OMAP3_MUX(HSUSB0_DATA1, (OMAP_MUX_MODE0 | OMAP_PIN_INPUT)),
    OMAP3_MUX(HSUSB0_DATA2, (OMAP_MUX_MODE0 | OMAP_PIN_INPUT)),
    OMAP3_MUX(HSUSB0_DATA3, (OMAP_MUX_MODE0 | OMAP_PIN_INPUT)),
    OMAP3_MUX(HSUSB0_DATA4, (OMAP_MUX_MODE0 | OMAP_PIN_INPUT)),
    OMAP3_MUX(HSUSB0_DATA5, (OMAP_MUX_MODE0 | OMAP_PIN_INPUT)),
    OMAP3_MUX(HSUSB0_DATA6, (OMAP_MUX_MODE0 | OMAP_PIN_INPUT)),
    OMAP3_MUX(HSUSB0_DATA7, (OMAP_MUX_MODE0 | OMAP_PIN_INPUT)),
    OMAP3_MUX(HSUSB0_DIR,   (OMAP_MUX_MODE0 | OMAP_PIN_INPUT)),
    OMAP3_MUX(HSUSB0_NXT,   (OMAP_MUX_MODE0 | OMAP_PIN_INPUT)),
    OMAP3_MUX(HSUSB0_STP,   (OMAP_MUX_MODE0 | OMAP_PIN_OUTPUT)),
#endif /* CONFIG_MACH_OMAP3_H1_DVT */

    /* accelerometer */
     
    OMAP3_MUX(JTAG_EMU1, (OMAP_MUX_MODE4 | OMAP_PIN_INPUT 
                          | OMAP_PIN_OFF_WAKEUPENABLE)),

    /* USB on */
    
    OMAP3_MUX(ETK_D7, (OMAP_MUX_MODE4 | OMAP_PIN_OUTPUT)),

	{ .reg_offset = OMAP_MUX_TERMINATOR },
};
#endif

static int __init omap3_wake_init (void) {
  pidfile = debugfs_create_file("wake_signal_pid", 0200, NULL, NULL, &h1_fops);
  acc_wake.user_pid = 0; /* No user thread yet */

  snprintf(acc_wake.lock_name, sizeof(acc_wake.lock_name),
           "Accelerometer");
  wake_lock_init(&acc_wake.lock, WAKE_LOCK_SUSPEND,
                 acc_wake.lock_name);
  return 0;
}


static void __init omap3_h1_init(void)
{
    omap3_mux_init(board_mux, OMAP_PACKAGE_CBP);

	omap3_h1_i2c_init();
  
	omap_display_init(&omap3h1_dss_data);
	omap_serial_init();
	omap_sdrc_init(NULL, NULL);

	board_nand_init(omap3h1_nand_partitions,
                    ARRAY_SIZE(omap3h1_nand_partitions), NAND_CS,
                    NAND_BUSWIDTH_16, NULL);

	platform_add_devices(omap3h1_devices, ARRAY_SIZE(omap3h1_devices));

	omap3h1_spi_init();

	usb_bind_phy("musb-hdrc.0.auto", 0, "nop_usb_xceiv"); /* "tusb-usb-h1" */
	usb_musb_init(&musb_board_data);

    /* Set up the voltage domains */

    omap3_voltdm_init();

    /* For handling interrupts from the accelerometer */

    /* previous = jiffies; */
     
    /* Init the code that handles wake ups */

    /* omap3_wake_init(); */

    /* omap3_acc_irq_init(omap3h1_i2c2_board_info[0].irq, (void *) &omap3h1_devices); */
}

MACHINE_START(OMAP3_H1, "Olio OMAP3 H1 Board")
	.atag_offset	= 0x100,
	.reserve		= omap_reserve,
	.map_io			= omap3_map_io,
	.init_early		= omap3630_init_early,
	.init_irq		= omap3_init_irq,
	.handle_irq		= omap3_intc_handle_irq,
	.init_machine	= omap3_h1_init,
	.init_late		= omap3630_init_late,
	.init_time		= omap3_secure_sync32k_timer_init,
	/* .dt_compat		= omap3_h1_boards_compat, */
	.restart		= omap3xxx_restart,
MACHINE_END