path: root/arch/arm/mach-tegra/baseband-xmm-power.c

/*
 * arch/arm/mach-tegra/baseband-xmm-power.c
 *
 * Copyright (C) 2011 NVIDIA Corporation
 *
 * This software is licensed under the terms of the GNU General Public
 * License version 2, as published by the Free Software Foundation, and
 * may be copied, distributed, and modified under those terms.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 */

#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/platform_device.h>
#include <linux/gpio.h>
#include <linux/interrupt.h>
#include <linux/workqueue.h>
#include <linux/slab.h>
#include <linux/delay.h>
#include <linux/fs.h>
#include <linux/uaccess.h>
#include <linux/wakelock.h>
#include <mach/usb_phy.h>
#include "board.h"
#include "devices.h"
#include "gpio-names.h"
#include "baseband-xmm-power.h"

#define VENDOR_ID         0x1519
#define PRODUCT_ID        0x0020

MODULE_LICENSE("GPL");

unsigned long modem_ver = XMM_MODEM_VER_1121;
EXPORT_SYMBOL(modem_ver);

unsigned long modem_flash;
EXPORT_SYMBOL(modem_flash);

unsigned long modem_pm = 1;
EXPORT_SYMBOL(modem_pm);

unsigned long enum_delay_ms = 1000; /* ignored if !modem_flash */

module_param(modem_ver, ulong, 0644);
MODULE_PARM_DESC(modem_ver,
	"baseband xmm power - modem software version");
module_param(modem_flash, ulong, 0644);
MODULE_PARM_DESC(modem_flash,
	"baseband xmm power - modem flash (1 = flash, 0 = flashless)");
module_param(modem_pm, ulong, 0644);
MODULE_PARM_DESC(modem_pm,
	"baseband xmm power - modem power management (1 = pm, 0 = no pm)");
module_param(enum_delay_ms, ulong, 0644);
MODULE_PARM_DESC(enum_delay_ms,
	"baseband xmm power - delay in ms between modem on and enumeration");

/* Currently no baseband initiated suspend */
#define BB_INITIATED_L2_SUSPEND 0

static struct gpio tegra_baseband_gpios[] = {
	{ -1, GPIOF_OUT_INIT_LOW,  "BB_RSTn" },
	{ -1, GPIOF_OUT_INIT_LOW,  "BB_ON"   },
	{ -1, GPIOF_OUT_INIT_LOW,  "IPC_BB_WAKE" },
	{ -1, GPIOF_IN,            "IPC_AP_WAKE" },
	{ -1, GPIOF_OUT_INIT_HIGH, "IPC_HSIC_ACTIVE" },
	{ -1, GPIOF_IN,            "IPC_HSIC_SUS_REQ" },
};

#if BB_INITIATED_L2_SUSPEND
static enum {
	IPC_HSIC_SUS_REQ_UNINIT,
	IPC_HSIC_SUS_REQ_IRQ_READY,
	IPC_HSIC_SUS_REQ_INIT,
	IPC_HSIC_SUS_REQ_L,
	IPC_HSIC_SUS_REQ_H,
} ipc_hsic_sus_req_state;
#endif

static enum {
	IPC_AP_WAKE_UNINIT,
	IPC_AP_WAKE_IRQ_READY,
	IPC_AP_WAKE_INIT1,
	IPC_AP_WAKE_INIT2,
	IPC_AP_WAKE_L,
	IPC_AP_WAKE_H,
} ipc_ap_wake_state;

enum baseband_xmm_powerstate_t baseband_xmm_powerstate;

static struct workqueue_struct *workqueue;
static struct work_struct init1_work;
static struct work_struct init2_work;
static struct work_struct init3_work;
static struct baseband_power_platform_data *baseband_power_driver_data;
static bool register_hsic_device;
static struct wake_lock wakelock;

static int baseband_xmm_power_on(struct platform_device *device)
{
	struct baseband_power_platform_data *data;

	pr_debug("%s {\n", __func__);

	/* check for device / platform data */
	if (!device) {
		pr_err("%s: !device\n", __func__);
		return -EINVAL;
	}
	data = (struct baseband_power_platform_data *)
		device->dev.platform_data;
	if (!data) {
		pr_err("%s: !data\n", __func__);
		return -EINVAL;
	}

	/* turn on usb host controller */
	if (!modem_flash) {
		/* if already registered usb host controller, then turn on
		 * using ehci_power file
		 */
		if (!register_hsic_device) {
			mm_segment_t oldfs;
			struct file *filp;
			pr_debug("%s(%d) register usb host controller echo on\n",
				__func__, __LINE__);
			oldfs = get_fs();
			set_fs(KERNEL_DS);
			filp = filp_open(TEGRA_EHCI_DEVICE, O_RDWR, 0);
			if (IS_ERR(filp) || (filp == NULL)) {
				pr_err("open ehci_power failed\n");
			} else {
				filp->f_op->write(filp, "1", 1, &filp->f_pos);
				filp_close(filp, NULL);
			}
			set_fs(oldfs);
		}
		/* else if usb host controller not registered yet, then turn
		 * on will occur later in this function (when usb host
		 * controller is registered for first time)
		 */
	}

	/* reset the state machine */
	baseband_xmm_powerstate = BBXMM_PS_INIT;
	ipc_ap_wake_state = IPC_AP_WAKE_INIT2;

	/* wait 20 ms */
	mdelay(20);

	/* reset / power on sequence */
	mdelay(40);
	gpio_set_value(data->modem.xmm.bb_rst, 1);
	mdelay(1);
	gpio_set_value(data->modem.xmm.bb_on, 1);
	udelay(40);
	gpio_set_value(data->modem.xmm.bb_on, 0);

	/* register usb host controller */
	if (!modem_flash) {
		/* register usb host controller only once */
		if (register_hsic_device) {
			pr_debug("%s(%d) register usb host controller\n",
				__func__, __LINE__);
			platform_device_register(data->modem.xmm.hsic_device);
			register_hsic_device = false;
		}
	}

	pr_debug("%s }\n", __func__);

	return 0;
}

static int baseband_xmm_power_off(struct platform_device *device)
{
	struct baseband_power_platform_data *data;

	pr_debug("%s {\n", __func__);

	/* check for device / platform data */
	if (!device) {
		pr_err("%s: !device\n", __func__);
		return -EINVAL;
	}
	data = (struct baseband_power_platform_data *)
		device->dev.platform_data;
	if (!data) {
		pr_err("%s: !data\n", __func__);
		return -EINVAL;
	}

	/* turn off usb host controller */
	{
		mm_segment_t oldfs;
		struct file *filp;
		oldfs = get_fs();
		set_fs(KERNEL_DS);
		filp = filp_open(TEGRA_EHCI_DEVICE, O_RDWR, 0);
		if (IS_ERR(filp) || (filp == NULL)) {
			pr_err("open ehci_power failed\n");
		} else {
			filp->f_op->write(filp, "0", 1, &filp->f_pos);
			filp_close(filp, NULL);
		}
		set_fs(oldfs);
	}

	/* set IPC_HSIC_ACTIVE low */
	gpio_set_value(baseband_power_driver_data->
		modem.xmm.ipc_hsic_active, 0);

	/* wait 20 ms */
	mdelay(20);

	/* drive bb_rst low */
	gpio_set_value(data->modem.xmm.bb_rst, 0);
	mdelay(1);

	pr_debug("%s }\n", __func__);

	return 0;
}

static ssize_t baseband_xmm_onoff(struct device *dev,
			struct device_attribute *attr,
			const char *buf, size_t count)
{
	int power_onoff;
	struct platform_device *device = to_platform_device(dev);

	pr_debug("%s\n", __func__);

	if (sscanf(buf, "%d", &power_onoff) != 1)
		return -EINVAL;

	if (power_onoff == 0)
		baseband_xmm_power_off(device);
	else if (power_onoff == 1)
		baseband_xmm_power_on(device);
	return count;
}

static DEVICE_ATTR(xmm_onoff, S_IRUSR | S_IWUSR | S_IRGRP,
		NULL, baseband_xmm_onoff);

void baseband_xmm_set_power_status(unsigned int status)
{
	switch (status) {
	case BBXMM_PS_L0:
		wake_lock(&wakelock);
		break;
	case BBXMM_PS_L2:
		wake_unlock(&wakelock);
		break;
	case BBXMM_PS_L2TOL0:
		/* do this only from L2 state */
		if (baseband_xmm_powerstate == BBXMM_PS_L2)
			queue_work(workqueue, &init3_work);
	default:
		break;
	}
	baseband_xmm_powerstate = status;
	pr_debug("BB XMM POWER STATE = %d\n", status);
}
EXPORT_SYMBOL_GPL(baseband_xmm_set_power_status);

#if BB_INITIATED_L2_SUSPEND
static irqreturn_t baseband_xmm_power_ipc_hsic_sus_req_irq
	(int irq, void *dev_id)
{
	int value;

	pr_debug("%s\n", __func__);

	if (ipc_hsic_sus_req_state < IPC_HSIC_SUS_REQ_IRQ_READY) {
		pr_err("%s - spurious irq\n", __func__);
	} else {
		value = gpio_get_value(baseband_power_driver_data->
			modem.xmm.ipc_hsic_sus_req);
		if (!value) {
			pr_debug("%s - falling\n", __func__);
			ipc_hsic_sus_req_state = IPC_HSIC_SUS_REQ_L;
		} else {
			pr_debug("%s - rising\n", __func__);
			ipc_hsic_sus_req_state = IPC_HSIC_SUS_REQ_H;
		}
	}

	return IRQ_HANDLED;
}
#endif

irqreturn_t baseband_xmm_power_ipc_ap_wake_irq(int irq, void *dev_id)
{
	int value;

	pr_debug("%s\n", __func__);

	if (ipc_ap_wake_state < IPC_AP_WAKE_IRQ_READY) {
		pr_err("%s - spurious irq\n", __func__);
	} else if (ipc_ap_wake_state == IPC_AP_WAKE_IRQ_READY) {
		value = gpio_get_value(baseband_power_driver_data->
			modem.xmm.ipc_ap_wake);
		if (!value) {
			pr_debug("%s - IPC_AP_WAKE_INIT1"
				" - got falling edge\n",
				__func__);
			/* go to IPC_AP_WAKE_INIT1 state */
			ipc_ap_wake_state = IPC_AP_WAKE_INIT1;
			/* queue work */
			queue_work(workqueue, &init1_work);
		} else {
			pr_debug("%s - IPC_AP_WAKE_INIT1"
				" - wait for falling edge\n",
				__func__);
		}
	} else if (ipc_ap_wake_state == IPC_AP_WAKE_INIT1) {
		value = gpio_get_value(baseband_power_driver_data->
			modem.xmm.ipc_ap_wake);
		if (!value) {
			pr_debug("%s - IPC_AP_WAKE_INIT2"
				" - wait for rising edge\n",
				__func__);
		} else {
			pr_debug("%s - IPC_AP_WAKE_INIT2"
				" - got rising edge\n",
				__func__);
			/* go to IPC_AP_WAKE_INIT2 state */
			ipc_ap_wake_state = IPC_AP_WAKE_INIT2;
			/* queue work */
			queue_work(workqueue, &init2_work);
		}
	} else {
		value = gpio_get_value(baseband_power_driver_data->
			modem.xmm.ipc_ap_wake);
		if (!value) {
			pr_debug("%s - falling\n", __func__);
			/* save gpio state */
			ipc_ap_wake_state = IPC_AP_WAKE_L;
		} else {
			pr_debug("%s - rising\n", __func__);
			/* [ver >= 1130] gpio protocol rising edge */
			if (modem_ver >= XMM_MODEM_VER_1130) {
				pr_debug("gpio host wakeup done <-\n");
				value = gpio_get_value
					(baseband_power_driver_data->
					modem.xmm.ipc_bb_wake);
				if (value) {
					/* Clear the slave wakeup request */
					gpio_set_value
						(baseband_power_driver_data->
						modem.xmm.ipc_bb_wake, 0);
					pr_debug("gpio slave wakeup done ->\n");
				}
			}
			/* save gpio state */
			ipc_ap_wake_state = IPC_AP_WAKE_H;
		}
	}

	return IRQ_HANDLED;
}
EXPORT_SYMBOL(baseband_xmm_power_ipc_ap_wake_irq);

static void baseband_xmm_power_init1_work(struct work_struct *work)
{
	int value;

	pr_debug("%s {\n", __func__);

	/* check if IPC_HSIC_ACTIVE high */
	value = gpio_get_value(baseband_power_driver_data->
		modem.xmm.ipc_hsic_active);
	if (value != 1) {
		pr_err("%s - expected IPC_HSIC_ACTIVE high!\n", __func__);
		return;
	}

	/* wait 100 ms */
	mdelay(100);

	/* set IPC_HSIC_ACTIVE low */
	gpio_set_value(baseband_power_driver_data->
		modem.xmm.ipc_hsic_active, 0);

	/* wait 10 ms */
	mdelay(10);

	/* set IPC_HSIC_ACTIVE high */
	gpio_set_value(baseband_power_driver_data->
		modem.xmm.ipc_hsic_active, 1);

	/* wait 20 ms */
	mdelay(20);

	pr_debug("%s }\n", __func__);
}

static void baseband_xmm_power_init2_work(struct work_struct *work)
{
	pr_debug("%s\n", __func__);

	/* register usb host controller only once */
	if (register_hsic_device) {
		platform_device_register(baseband_power_driver_data->
			modem.xmm.hsic_device);
		register_hsic_device = false;
	}

	baseband_xmm_set_power_status(BBXMM_PS_L0);

}

/* Do the work for AP initiated L2->L0 */
static void baseband_xmm_power_init3_work(struct work_struct *work)
{
	pr_debug("%s\n", __func__);
	/* set the slave wakeup request */
	gpio_set_value(baseband_power_driver_data->
		modem.xmm.ipc_bb_wake, 1);
}

static void baseband_xmm_power_reset_on(void)
{
	/* reset / power on sequence */
	mdelay(40);
	gpio_set_value(baseband_power_driver_data->modem.xmm.bb_rst, 1);
	mdelay(1);
	gpio_set_value(baseband_power_driver_data->modem.xmm.bb_on, 1);
	udelay(40);
	gpio_set_value(baseband_power_driver_data->modem.xmm.bb_on, 0);
}

static struct baseband_xmm_power_work_t *baseband_xmm_power_work;

static void baseband_xmm_power_work_func(struct work_struct *work)
{
	struct baseband_xmm_power_work_t *bbxmm_work
		= (struct baseband_xmm_power_work_t *) work;

	pr_debug("%s\n", __func__);

	switch (bbxmm_work->state) {
	case BBXMM_WORK_UNINIT:
		pr_debug("BBXMM_WORK_UNINIT\n");
		break;
	case BBXMM_WORK_INIT:
		pr_debug("BBXMM_WORK_INIT\n");
		/* go to next state */
		bbxmm_work->state = (modem_flash && !modem_pm)
			? BBXMM_WORK_INIT_FLASH_STEP1
			: (modem_flash && modem_pm)
			? BBXMM_WORK_INIT_FLASH_PM_STEP1
			: (!modem_flash && modem_pm)
			? BBXMM_WORK_INIT_FLASHLESS_PM_STEP1
			: BBXMM_WORK_UNINIT;
		queue_work(workqueue, work);
		break;
	case BBXMM_WORK_INIT_FLASH_STEP1:
		pr_debug("BBXMM_WORK_INIT_FLASH_STEP1\n");
		/* register usb host controller */
		platform_device_register(baseband_power_driver_data->modem
			.xmm.hsic_device);
		break;
	case BBXMM_WORK_INIT_FLASH_PM_STEP1:
		pr_debug("BBXMM_WORK_INIT_FLASH_PM_STEP1\n");
		/* [modem ver >= 1130] start with IPC_HSIC_ACTIVE low */
		if (modem_ver >= XMM_MODEM_VER_1130) {
			pr_debug("%s: ver > 1130:"
				" ipc_hsic_active -> 0\n", __func__);
			gpio_set_value(baseband_power_driver_data->
				modem.xmm.ipc_hsic_active, 0);
		}
		/* reset / power on sequence */
		baseband_xmm_power_reset_on();
		/* optional delay
		 * 0 = flashless
		 *   ==> causes next step to enumerate modem boot rom
		 *       (058b / 0041)
		 * some delay > boot rom timeout
		 *   ==> causes next step to enumerate modem software
		 *       (1519 / 0020)
		 *       (requires modem to be flash version, not flashless
		 *       version)
		 */
		if (enum_delay_ms)
			mdelay(enum_delay_ms);
		/* register usb host controller */
		platform_device_register(baseband_power_driver_data->modem
			.xmm.hsic_device);
		/* go to next state */
		bbxmm_work->state = (modem_ver < XMM_MODEM_VER_1130)
			? BBXMM_WORK_INIT_FLASH_PM_VER_LT_1130_STEP1
			: BBXMM_WORK_INIT_FLASH_PM_VER_GE_1130_STEP1;
		queue_work(workqueue, work);
		break;
	case BBXMM_WORK_INIT_FLASH_PM_VER_LT_1130_STEP1:
		pr_debug("BBXMM_WORK_INIT_FLASH_PM_VER_LT_1130_STEP1\n");
		break;
	case BBXMM_WORK_INIT_FLASH_PM_VER_GE_1130_STEP1:
		pr_debug("BBXMM_WORK_INIT_FLASH_PM_VER_GE_1130_STEP1\n");
		break;
	case BBXMM_WORK_INIT_FLASHLESS_PM_STEP1:
		pr_debug("BBXMM_WORK_INIT_FLASHLESS_PM_STEP1\n");
		/* go to next state */
		bbxmm_work->state = (modem_ver < XMM_MODEM_VER_1130)
			? BBXMM_WORK_INIT_FLASHLESS_PM_VER_LT_1130_WAIT_IRQ
			: BBXMM_WORK_INIT_FLASHLESS_PM_VER_GE_1130_STEP1;
		queue_work(workqueue, work);
		break;
	case BBXMM_WORK_INIT_FLASHLESS_PM_VER_LT_1130_STEP1:
		pr_debug("BBXMM_WORK_INIT_FLASHLESS_PM_VER_LT_1130_STEP1\n");
		break;
	case BBXMM_WORK_INIT_FLASHLESS_PM_VER_GE_1130_STEP1:
		pr_debug("BBXMM_WORK_INIT_FLASHLESS_PM_VER_GE_1130_STEP1\n");
		break;
	default:
		break;
	}

}

static int baseband_xmm_power_driver_probe(struct platform_device *device)
{
	struct baseband_power_platform_data *data
		= (struct baseband_power_platform_data *)
			device->dev.platform_data;
	struct device *dev = &device->dev;
	int err;

	pr_debug("%s\n", __func__);

	/* check for platform data */
	if (!data)
		return -ENODEV;

	/* check if supported modem */
	if (data->baseband_type != BASEBAND_XMM) {
		pr_err("unsuppported modem\n");
		return -ENODEV;
	}

	/* save platform data */
	baseband_power_driver_data = data;

	/* create device file */
	err = device_create_file(dev, &dev_attr_xmm_onoff);
	if (err < 0) {
		pr_err("%s - device_create_file failed\n", __func__);
		return -ENODEV;
	}

	/* init wake lock */
	wake_lock_init(&wakelock, WAKE_LOCK_SUSPEND, "baseband_xmm_power");

	/* request baseband gpio(s) */
	tegra_baseband_gpios[0].gpio = baseband_power_driver_data
		->modem.xmm.bb_rst;
	tegra_baseband_gpios[1].gpio = baseband_power_driver_data
		->modem.xmm.bb_on;
	tegra_baseband_gpios[2].gpio = baseband_power_driver_data
		->modem.xmm.ipc_bb_wake;
	tegra_baseband_gpios[3].gpio = baseband_power_driver_data
		->modem.xmm.ipc_ap_wake;
	tegra_baseband_gpios[4].gpio = baseband_power_driver_data
		->modem.xmm.ipc_hsic_active;
	tegra_baseband_gpios[5].gpio = baseband_power_driver_data
		->modem.xmm.ipc_hsic_sus_req;
	err = gpio_request_array(tegra_baseband_gpios,
		ARRAY_SIZE(tegra_baseband_gpios));
	if (err < 0) {
		pr_err("%s - request gpio(s) failed\n", __func__);
		return -ENODEV;
	}

	/* request baseband irq(s) */
#if BB_INITIATED_L2_SUSPEND
	if (modem_pm) {
		ipc_hsic_sus_req_state = IPC_HSIC_SUS_REQ_UNINIT;
		err = request_irq(gpio_to_irq(data->modem.xmm.ipc_hsic_sus_req),
			ipc_hsic_sus_req_irq,
			IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
			"IPC_HSIC_SUS_REQ_IRQ",
			NULL);
		if (err < 0) {
			pr_err("%s - request irq IPC_HSIC_SUS_REQ_IRQ failed\n",
				__func__);
			return err;
		}
		ipc_hsic_sus_req_state = IPC_HSIC_SUS_REQ_IRQ_READY;
	}
#endif
	if (modem_flash && modem_pm) {
		pr_info("%s: request_irq IPC_AP_WAKE_IRQ\n", __func__);
		ipc_ap_wake_state = IPC_AP_WAKE_UNINIT;
		err = request_irq(gpio_to_irq(data->modem.xmm.ipc_ap_wake),
			baseband_xmm_power_ipc_ap_wake_irq,
			IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
			"IPC_AP_WAKE_IRQ",
			NULL);
		if (err < 0) {
			pr_err("%s - request irq IPC_AP_WAKE_IRQ failed\n",
				__func__);
			return err;
		}
		ipc_ap_wake_state = IPC_AP_WAKE_IRQ_READY;
		if (modem_ver >= XMM_MODEM_VER_1130) {
			pr_debug("%s: ver > 1130: AP_WAKE_INIT1\n", __func__);
			/* ver 1130 or later starts in INIT1 state */
			ipc_ap_wake_state = IPC_AP_WAKE_INIT1;
		}
	}

	/* init work queue */
	workqueue = create_singlethread_workqueue
		("baseband_xmm_power_workqueue");
	if (!workqueue) {
		pr_err("cannot create workqueue\n");
		return -1;
	}
	baseband_xmm_power_work = (struct baseband_xmm_power_work_t *)
		kmalloc(sizeof(struct baseband_xmm_power_work_t), GFP_KERNEL);
	if (!baseband_xmm_power_work) {
		pr_err("cannot allocate baseband_xmm_power_work\n");
		return -1;
	}
	INIT_WORK((struct work_struct *) baseband_xmm_power_work,
		baseband_xmm_power_work_func);
	baseband_xmm_power_work->state = BBXMM_WORK_INIT;
	queue_work(workqueue,
		(struct work_struct *) baseband_xmm_power_work);

	/* init work objects */
	INIT_WORK(&init1_work, baseband_xmm_power_init1_work);
	INIT_WORK(&init2_work, baseband_xmm_power_init2_work);
	INIT_WORK(&init3_work, baseband_xmm_power_init3_work);

	/* init state variables */
	register_hsic_device = true;
	baseband_xmm_powerstate = BBXMM_PS_UNINIT;

	return 0;
}

static int baseband_xmm_power_driver_remove(struct platform_device *device)
{
	struct baseband_power_platform_data *data
		= (struct baseband_power_platform_data *)
			device->dev.platform_data;
	struct device *dev = &device->dev;

	pr_debug("%s\n", __func__);

	/* check for platform data */
	if (!data)
		return 0;

	/* free work structure */
	kfree(baseband_xmm_power_work);
	baseband_xmm_power_work = (struct baseband_xmm_power_work_t *) 0;

	/* free baseband irq(s) */
	if (modem_flash && modem_pm) {
		free_irq(gpio_to_irq(baseband_power_driver_data
			->modem.xmm.ipc_ap_wake), NULL);
	}
	if (modem_pm) {
#if BB_INITIATED_L2_SUSPEND
		free_irq(gpio_to_irq(baseband_power_driver_data
			->modem.xmm.ipc_hsic_sus_req), NULL);
#endif
	}

	/* free baseband gpio(s) */
	gpio_free_array(tegra_baseband_gpios,
		ARRAY_SIZE(tegra_baseband_gpios));

	/* destroy wake lock */
	wake_lock_destroy(&wakelock);

	/* delete device file */
	device_remove_file(dev, &dev_attr_xmm_onoff);

	/* unregister usb host controller */
	platform_device_unregister(baseband_power_driver_data->
		modem.xmm.hsic_device);

	return 0;
}

static int baseband_xmm_power_driver_suspend(struct platform_device *device,
	pm_message_t state)
{
	pr_debug("%s\n", __func__);
	return 0;
}

static int baseband_xmm_power_driver_resume(struct platform_device *device)
{
	struct baseband_power_platform_data *data
		= (struct baseband_power_platform_data *)
			device->dev.platform_data;
	int value;
	int delay = 10000; /* maxmum delay in msec */

	pr_debug("%s\n", __func__);

	/* check for platform data */
	if (!baseband_power_driver_data)
		return 0;

	baseband_xmm_set_power_status(BBXMM_PS_L3TOL0);

	value = gpio_get_value(data->modem.xmm.ipc_ap_wake);
	if (value) {
		pr_info("AP L3 -> L0\n");
		/* wake bb */
		gpio_set_value(data->modem.xmm.ipc_bb_wake, 1);

		pr_debug("waiting for host wakeup...\n");
		do {
			mdelay(1);
			value = gpio_get_value(data->modem.xmm.ipc_ap_wake);
			delay--;
		} while ((value) && (delay));
		if (delay)
			pr_debug("gpio host wakeup low <-\n");
	} else {
		pr_info("CP L3 -> L0\n");
	}

	return 0;
}

static struct platform_driver baseband_power_driver = {
	.probe = baseband_xmm_power_driver_probe,
	.remove = baseband_xmm_power_driver_remove,
#ifdef CONFIG_PM
	.suspend = baseband_xmm_power_driver_suspend,
	.resume = baseband_xmm_power_driver_resume,
#endif
	.driver = {
		.name = "baseband_xmm_power",
	},
};

static int __init baseband_xmm_power_init(void)
{
	pr_debug("%s\n", __func__);
	return platform_driver_register(&baseband_power_driver);
}

static void __exit baseband_xmm_power_exit(void)
{
	pr_debug("%s\n", __func__);
	platform_driver_unregister(&baseband_power_driver);
}

module_init(baseband_xmm_power_init)
module_exit(baseband_xmm_power_exit)