/*****************************************************************************
 *
 * Filename:
 * ---------
 *   ccci_pmic.c
 *
 * Project:
 * --------
 *   ALPS
 *
 * Description:
 * ------------
 *   MT65XX CCCI PMIC Driver
 *
 ****************************************************************************/

#include <linux/kernel.h>
#include <linux/device.h>
#include <linux/cdev.h>
#include <linux/spinlock.h>
#include <linux/wakelock.h>
#include <linux/interrupt.h>
#include <linux/workqueue.h>
#include <linux/delay.h>
#include <linux/wait.h>
#include <linux/fs.h>
#include <linux/uaccess.h>
#include <linux/platform_device.h>
#include <linux/dma-mapping.h>
#include <ccci.h>
#include <ccci_pmic.h>

enum vsim_sel_enum {
	VSIM_1_3V = 0,
	VSIM_1_5V,
	VSIM_1_8V,
	VSIM_2_5V,
	VSIM_2_8V,
	VSIM_3_0V,
	VSIM_3_3V,
	VSIM_1_2V
};

#define  CONFIG_CCCI_PMIC_DEBUG_MSG
#define  CCCI_PMIC_DEVNAME  "ccci_pmic"
#define  CCCI_PMIC_QSIZE     (10)

static DEFINE_SPINLOCK(pmic_spinlock);
static struct shared_mem_pmic_t *ccci_pmic_shared_mem;
static int ccci_pmic_shared_mem_phys_addr;

static dev_t pmic_dev_num;
static struct cdev pmic_cdev;
static struct kfifo pmic_fifo;

static void ccci_pmic_read(struct work_struct *ws);
static DECLARE_WORK(ccci_pmic_read_work, ccci_pmic_read);

int g_VSIM_1 = 2;
int g_VSIM_2 = 2;

static void ccci_pmic_read(struct work_struct *ws)
{
	unsigned long exec_time_1 = 0, exec_time_2 = 0;
	unsigned long arg;
	unsigned long flag;
	/*  mt6326_check_power(); */

	/*
	 *    0. Start Timer
	 */
	/*  exec_time_1 = sampletrigger(0, 0, 0); */
	exec_time_1 = 0;

	/* #ifdef CONFIG_CCCI_PMIC_DEBUG_MSG */
	CCCI_PMIC_MSG("ccci_pmic_callback : exec_time_1 = %ld ms\r\n",
		      exec_time_1);
	/* #endif */

	/*
	 *    1. Parsing CCCI Message Format which received from MD site
	 */
	spin_lock_irqsave(&pmic_spinlock, flag);
	if (kfifo_out(&pmic_fifo, (unsigned char *)&arg, sizeof(unsigned long))
	    != sizeof(unsigned long)) {
		spin_unlock_irqrestore(&pmic_spinlock, flag);
		CCCI_MSG("<pmic>Unable to get new request from fifo\n");
		return;
	}
	spin_unlock_irqrestore(&pmic_spinlock, flag);
	ccci_pmic_shared_mem->ccci_msg.pmic6326_op = arg & 0x000000FF;
	ccci_pmic_shared_mem->ccci_msg.pmic6326_type = (arg & 0x0000FF00) >> 8;
	ccci_pmic_shared_mem->ccci_msg.pmic6326_param1 =
	    (arg & 0x00FF0000) >> 16;
	ccci_pmic_shared_mem->ccci_msg.pmic6326_param2 =
	    (arg & 0xFF000000) >> 24;

	/*
	 *    2. Execute the operation (API) that MD site called
	 */
	switch (ccci_pmic_shared_mem->ccci_msg.pmic6326_op) {
	case PMIC6326_VSIM_ENABLE:
		/* #ifdef CONFIG_CCCI_PMIC_DEBUG_MSG */
		CCCI_PMIC_MSG("PMIC6326_VSIM_ENABLE\n");
		/* #endif */
		/* pmic_vsim_enable(ccci_pmic_shared_mem->ccci_msg.pmic6326_param1); */

		break;

	case PMIC6326_VSIM_SET_AND_ENABLE:
		/* #ifdef CONFIG_CCCI_PMIC_DEBUG_MSG */
		CCCI_PMIC_MSG("PMIC6326_VSIM_SET_AND_ENABLE\n");
		/* #endif */
		/* pmic_vsim_cal(0); */
		/* pmic_vsim_sel(ccci_pmic_shared_mem->ccci_msg.pmic6326_param1); */
		/* pmic_vsim_enable(KAL_TRUE); */

		break;

	case PMIC6236_LOCK:
		/* #ifdef CONFIG_CCCI_PMIC_DEBUG_MSG */
		CCCI_PMIC_MSG("PMIC6236_LOCK\n");
		/* #endif */
		break;

	case PMIC6326_UNLOCK:
		/* #ifdef CONFIG_CCCI_PMIC_DEBUG_MSG */
		CCCI_PMIC_MSG("CONFIG_CCCI_PMIC_DEBUG_MSG\n");
		/* #endif */
		break;

	case PMIC6326_VSIM2_ENABLE:
		/* #ifdef CONFIG_CCCI_PMIC_DEBUG_MSG */
		CCCI_PMIC_MSG("PMIC6326_VSIM2_ENABLE\n");
		/* #endif */
		/* pmic_vsim2_enable(ccci_pmic_shared_mem->ccci_msg.pmic6326_param1); */

		break;

	case PMIC6326_VSIM2_SET_AND_ENABLE:
		/* #ifdef CONFIG_CCCI_PMIC_DEBUG_MSG */
		CCCI_PMIC_MSG("PMIC6326_VSIM2_SET_AND_ENABLE\n");
		/* #endif */
		/* pmic_vsim2_sel(ccci_pmic_shared_mem->ccci_msg.pmic6326_param1); */
		/* pmic_vsim2_enable(KAL_TRUE); */

		break;

	default:
		/* #ifdef CONFIG_CCCI_PMIC_DEBUG_MSG */
		CCCI_PMIC_MSG("Error op\n");
		/* #endif */
	}

	/*  exec_time_2 = sampletrigger(0, 0, 1); */
	exec_time_2 = 10000;

	/* #ifdef CONFIG_CCCI_PMIC_DEBUG_MSG */
	CCCI_PMIC_MSG("exec_time_2 = %ld ms\r\n", exec_time_2);
	/* #endif */

	exec_time_2 = (exec_time_2 - exec_time_1) / 1000;
	/* #ifdef CONFIG_CCCI_PMIC_DEBUG_MSG */
	CCCI_PMIC_MSG("exec_time = %ld ms\r\n", exec_time_2);
	/* #endif */

	/*
	 *    3. AP site write Message to share memory "ccci_pmic_shared_mem"
	 */
	ccci_pmic_shared_mem->ccci_msg.pmic6326_type = (kal_uint8) PMIC6326_RES;
	ccci_pmic_shared_mem->ccci_msg_info.pmic6326_exec_time = exec_time_2;

	ccci_pmic_shared_mem->ccci_msg = ccci_pmic_shared_mem->ccci_msg;
	ccci_pmic_shared_mem->ccci_msg_info =
	    ccci_pmic_shared_mem->ccci_msg_info;
}

static void ccci_pmic_callback(struct CCCI_BUFF_T *buff, void *private_data)
{
	unsigned long flag;
	/* #ifdef CONFIG_CCCI_PMIC_DEBUG_MSG */
	CCCI_PMIC_MSG("callback++\n");
	/* #endif */

	spin_lock_irqsave(&pmic_spinlock, flag);
	if (buff->channel == CCCI_PMIC_RX) {
		if (kfifo_in
		    (&pmic_fifo, (unsigned char *)&buff->data[1],
		     sizeof(unsigned long)) != sizeof(unsigned long)) {
			spin_unlock_irqrestore(&pmic_spinlock, flag);
			/* CCCI_LOGE("CCCI_PMIC: Unable to put new request into fifo\n"); */
			CCCI_PMIC_MSG("callback--0\n");
			return;
		}
		spin_unlock_irqrestore(&pmic_spinlock, flag);
		schedule_work(&ccci_pmic_read_work);
	}
	CCCI_PMIC_MSG("callback--1\n");
}

static int ccci_pmic_start(void)
{
	int size;

	/* #ifdef CONFIG_CCCI_PMIC_DEBUG_MSG */
	CCCI_PMIC_MSG("ccci_pmic_start\n");
	/* #endif */

	if (0 !=
	    kfifo_alloc(&pmic_fifo, sizeof(unsigned long) * CCCI_PMIC_QSIZE,
			GFP_KERNEL)) {
		/* CCCI_LOGE("CCCI_PMIC: Unable to create fifo\n"); */
		CCCI_MSG("<pmic> Unable to create fifo\n");
		return -EFAULT;
	}

	CCCI_PMIC_MSG("%x:%x:%d\n", (unsigned int)ccci_pmic_shared_mem,
		      (unsigned int)ccci_pmic_shared_mem_phys_addr, size);
	return 0;
}

static void ccci_pmic_stop(void)
{
	/* #ifdef CONFIG_CCCI_PMIC_DEBUG_MSG */
	CCCI_PMIC_MSG("pmic_stop\n");
	/* #endif */
	ccci_pmic_shared_mem = NULL;
	ccci_pmic_shared_mem_phys_addr = 0;
	kfifo_free(&pmic_fifo);
}

static const struct file_operations pmic_fops = {
	.owner = THIS_MODULE,
};

int __init ccci_pmic_init(void)
{
	int ret;

	if (alloc_chrdev_region(&pmic_dev_num, 0, 1, CCCI_PMIC_DEVNAME)) {
		CCCI_MSG("<pmic>Device major number allocation failed\n");
		return -EAGAIN;
	}

	cdev_init(&pmic_cdev, &pmic_fops);
	pmic_cdev.owner = THIS_MODULE;
	ret = cdev_add(&pmic_cdev, pmic_dev_num, 1);
	if (ret) {
		CCCI_MSG("<pmic>Char device add failed\n");
		return ret;
	}

	ret = ccci_pmic_start();
	if (ret) {
		CCCI_MSG("<pmic>Unable to initialize environment\n");
		return ret;
	}

	CCCI_PMIC_MSG("Init complete, device major number = %d\n",
		      MAJOR(pmic_dev_num));

	return 0;
}

void __exit ccci_pmic_exit(void)
{
	ccci_pmic_stop();

	cdev_del(&pmic_cdev);
	unregister_chrdev_region(pmic_dev_num, 1);
}