[mirror_ubuntu-bionic-kernel.git] / drivers / media / video / marvell-ccic / mmp-driver.c

/*
 * Support for the camera device found on Marvell MMP processors; known
 * to work with the Armada 610 as used in the OLPC 1.75 system.
 *
 * Copyright 2011 Jonathan Corbet <corbet@lwn.net>
 *
 * This file may be distributed under the terms of the GNU General
 * Public License, version 2.
 */

#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/i2c.h>
#include <linux/i2c-gpio.h>
#include <linux/interrupt.h>
#include <linux/spinlock.h>
#include <linux/slab.h>
#include <linux/videodev2.h>
#include <media/v4l2-device.h>
#include <media/v4l2-chip-ident.h>
#include <media/mmp-camera.h>
#include <linux/device.h>
#include <linux/platform_device.h>
#include <linux/gpio.h>
#include <linux/io.h>
#include <linux/delay.h>
#include <linux/list.h>
#include <linux/pm.h>

#include "mcam-core.h"

MODULE_ALIAS("platform:mmp-camera");
MODULE_AUTHOR("Jonathan Corbet <corbet@lwn.net>");
MODULE_LICENSE("GPL");

struct mmp_camera {
	void *power_regs;
	struct platform_device *pdev;
	struct mcam_camera mcam;
	struct list_head devlist;
	int irq;
};

static inline struct mmp_camera *mcam_to_cam(struct mcam_camera *mcam)
{
	return container_of(mcam, struct mmp_camera, mcam);
}

/*
 * A silly little infrastructure so we can keep track of our devices.
 * Chances are that we will never have more than one of them, but
 * the Armada 610 *does* have two controllers...
 */

static LIST_HEAD(mmpcam_devices);
static struct mutex mmpcam_devices_lock;

static void mmpcam_add_device(struct mmp_camera *cam)
{
	mutex_lock(&mmpcam_devices_lock);
	list_add(&cam->devlist, &mmpcam_devices);
	mutex_unlock(&mmpcam_devices_lock);
}

static void mmpcam_remove_device(struct mmp_camera *cam)
{
	mutex_lock(&mmpcam_devices_lock);
	list_del(&cam->devlist);
	mutex_unlock(&mmpcam_devices_lock);
}

/*
 * Platform dev remove passes us a platform_device, and there's
 * no handy unused drvdata to stash a backpointer in.  So just
 * dig it out of our list.
 */
static struct mmp_camera *mmpcam_find_device(struct platform_device *pdev)
{
	struct mmp_camera *cam;

	mutex_lock(&mmpcam_devices_lock);
	list_for_each_entry(cam, &mmpcam_devices, devlist) {
		if (cam->pdev == pdev) {
			mutex_unlock(&mmpcam_devices_lock);
			return cam;
		}
	}
	mutex_unlock(&mmpcam_devices_lock);
	return NULL;
}


/*
 * Power-related registers; this almost certainly belongs
 * somewhere else.
 *
 * ARMADA 610 register manual, sec 7.2.1, p1842.
 */
#define CPU_SUBSYS_PMU_BASE	0xd4282800
#define REG_CCIC_DCGCR		0x28	/* CCIC dyn clock gate ctrl reg */
#define REG_CCIC_CRCR		0x50	/* CCIC clk reset ctrl reg	*/

/*
 * Power control.
 */
static void mmpcam_power_up_ctlr(struct mmp_camera *cam)
{
	iowrite32(0x3f, cam->power_regs + REG_CCIC_DCGCR);
	iowrite32(0x3805b, cam->power_regs + REG_CCIC_CRCR);
	mdelay(1);
}

static void mmpcam_power_up(struct mcam_camera *mcam)
{
	struct mmp_camera *cam = mcam_to_cam(mcam);
	struct mmp_camera_platform_data *pdata;
/*
 * Turn on power and clocks to the controller.
 */
	mmpcam_power_up_ctlr(cam);
/*
 * Provide power to the sensor.
 */
	mcam_reg_write(mcam, REG_CLKCTRL, 0x60000002);
	pdata = cam->pdev->dev.platform_data;
	gpio_set_value(pdata->sensor_power_gpio, 1);
	mdelay(5);
	mcam_reg_clear_bit(mcam, REG_CTRL1, 0x10000000);
	gpio_set_value(pdata->sensor_reset_gpio, 0); /* reset is active low */
	mdelay(5);
	gpio_set_value(pdata->sensor_reset_gpio, 1); /* reset is active low */
	mdelay(5);
}

static void mmpcam_power_down(struct mcam_camera *mcam)
{
	struct mmp_camera *cam = mcam_to_cam(mcam);
	struct mmp_camera_platform_data *pdata;
/*
 * Turn off clocks and set reset lines
 */
	iowrite32(0, cam->power_regs + REG_CCIC_DCGCR);
	iowrite32(0, cam->power_regs + REG_CCIC_CRCR);
/*
 * Shut down the sensor.
 */
	pdata = cam->pdev->dev.platform_data;
	gpio_set_value(pdata->sensor_power_gpio, 0);
	gpio_set_value(pdata->sensor_reset_gpio, 0);
}


static irqreturn_t mmpcam_irq(int irq, void *data)
{
	struct mcam_camera *mcam = data;
	unsigned int irqs, handled;

	spin_lock(&mcam->dev_lock);
	irqs = mcam_reg_read(mcam, REG_IRQSTAT);
	handled = mccic_irq(mcam, irqs);
	spin_unlock(&mcam->dev_lock);
	return IRQ_RETVAL(handled);
}


static int mmpcam_probe(struct platform_device *pdev)
{
	struct mmp_camera *cam;
	struct mcam_camera *mcam;
	struct resource *res;
	struct mmp_camera_platform_data *pdata;
	int ret;

	cam = kzalloc(sizeof(*cam), GFP_KERNEL);
	if (cam == NULL)
		return -ENOMEM;
	cam->pdev = pdev;
	INIT_LIST_HEAD(&cam->devlist);

	mcam = &cam->mcam;
	mcam->plat_power_up = mmpcam_power_up;
	mcam->plat_power_down = mmpcam_power_down;
	mcam->dev = &pdev->dev;
	mcam->use_smbus = 0;
	mcam->chip_id = V4L2_IDENT_ARMADA610;
	mcam->buffer_mode = B_DMA_sg;
	spin_lock_init(&mcam->dev_lock);
	/*
	 * Get our I/O memory.
	 */
	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (res == NULL) {
		dev_err(&pdev->dev, "no iomem resource!\n");
		ret = -ENODEV;
		goto out_free;
	}
	mcam->regs = ioremap(res->start, resource_size(res));
	if (mcam->regs == NULL) {
		dev_err(&pdev->dev, "MMIO ioremap fail\n");
		ret = -ENODEV;
		goto out_free;
	}
	/*
	 * Power/clock memory is elsewhere; get it too.  Perhaps this
	 * should really be managed outside of this driver?
	 */
	res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
	if (res == NULL) {
		dev_err(&pdev->dev, "no power resource!\n");
		ret = -ENODEV;
		goto out_unmap1;
	}
	cam->power_regs = ioremap(res->start, resource_size(res));
	if (cam->power_regs == NULL) {
		dev_err(&pdev->dev, "power MMIO ioremap fail\n");
		ret = -ENODEV;
		goto out_unmap1;
	}
	/*
	 * Find the i2c adapter.  This assumes, of course, that the
	 * i2c bus is already up and functioning.
	 */
	pdata = pdev->dev.platform_data;
	mcam->i2c_adapter = platform_get_drvdata(pdata->i2c_device);
	if (mcam->i2c_adapter == NULL) {
		ret = -ENODEV;
		dev_err(&pdev->dev, "No i2c adapter\n");
		goto out_unmap2;
	}
	/*
	 * Sensor GPIO pins.
	 */
	ret = gpio_request(pdata->sensor_power_gpio, "cam-power");
	if (ret) {
		dev_err(&pdev->dev, "Can't get sensor power gpio %d",
				pdata->sensor_power_gpio);
		goto out_unmap2;
	}
	gpio_direction_output(pdata->sensor_power_gpio, 0);
	ret = gpio_request(pdata->sensor_reset_gpio, "cam-reset");
	if (ret) {
		dev_err(&pdev->dev, "Can't get sensor reset gpio %d",
				pdata->sensor_reset_gpio);
		goto out_gpio;
	}
	gpio_direction_output(pdata->sensor_reset_gpio, 0);
	/*
	 * Power the device up and hand it off to the core.
	 */
	mmpcam_power_up(mcam);
	ret = mccic_register(mcam);
	if (ret)
		goto out_gpio2;
	/*
	 * Finally, set up our IRQ now that the core is ready to
	 * deal with it.
	 */
	res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
	if (res == NULL) {
		ret = -ENODEV;
		goto out_unregister;
	}
	cam->irq = res->start;
	ret = request_irq(cam->irq, mmpcam_irq, IRQF_SHARED,
			"mmp-camera", mcam);
	if (ret == 0) {
		mmpcam_add_device(cam);
		return 0;
	}

out_unregister:
	mccic_shutdown(mcam);
out_gpio2:
	mmpcam_power_down(mcam);
	gpio_free(pdata->sensor_reset_gpio);
out_gpio:
	gpio_free(pdata->sensor_power_gpio);
out_unmap2:
	iounmap(cam->power_regs);
out_unmap1:
	iounmap(mcam->regs);
out_free:
	kfree(cam);
	return ret;
}


static int mmpcam_remove(struct mmp_camera *cam)
{
	struct mcam_camera *mcam = &cam->mcam;
	struct mmp_camera_platform_data *pdata;

	mmpcam_remove_device(cam);
	free_irq(cam->irq, mcam);
	mccic_shutdown(mcam);
	mmpcam_power_down(mcam);
	pdata = cam->pdev->dev.platform_data;
	gpio_free(pdata->sensor_reset_gpio);
	gpio_free(pdata->sensor_power_gpio);
	iounmap(cam->power_regs);
	iounmap(mcam->regs);
	kfree(cam);
	return 0;
}

static int mmpcam_platform_remove(struct platform_device *pdev)
{
	struct mmp_camera *cam = mmpcam_find_device(pdev);

	if (cam == NULL)
		return -ENODEV;
	return mmpcam_remove(cam);
}

/*
 * Suspend/resume support.
 */
#ifdef CONFIG_PM

static int mmpcam_suspend(struct platform_device *pdev, pm_message_t state)
{
	struct mmp_camera *cam = mmpcam_find_device(pdev);

	if (state.event != PM_EVENT_SUSPEND)
		return 0;
	mccic_suspend(&cam->mcam);
	return 0;
}

static int mmpcam_resume(struct platform_device *pdev)
{
	struct mmp_camera *cam = mmpcam_find_device(pdev);

	/*
	 * Power up unconditionally just in case the core tries to
	 * touch a register even if nothing was active before; trust
	 * me, it's better this way.
	 */
	mmpcam_power_up_ctlr(cam);
	return mccic_resume(&cam->mcam);
}

#endif


static struct platform_driver mmpcam_driver = {
	.probe		= mmpcam_probe,
	.remove		= mmpcam_platform_remove,
#ifdef CONFIG_PM
	.suspend	= mmpcam_suspend,
	.resume		= mmpcam_resume,
#endif
	.driver = {
		.name	= "mmp-camera",
		.owner	= THIS_MODULE
	}
};


static int __init mmpcam_init_module(void)
{
	mutex_init(&mmpcam_devices_lock);
	return platform_driver_register(&mmpcam_driver);
}

static void __exit mmpcam_exit_module(void)
{
	platform_driver_unregister(&mmpcam_driver);
	/*
	 * platform_driver_unregister() should have emptied the list
	 */
	if (!list_empty(&mmpcam_devices))
		printk(KERN_ERR "mmp_camera leaving devices behind\n");
}

module_init(mmpcam_init_module);
module_exit(mmpcam_exit_module);
Commit	Line	Data
67a8dbbc JC	1	/*
	2	* Support for the camera device found on Marvell MMP processors; known
	3	* to work with the Armada 610 as used in the OLPC 1.75 system.
	4	*
	5	* Copyright 2011 Jonathan Corbet <corbet@lwn.net>
	6	*
	7	* This file may be distributed under the terms of the GNU General
	8	* Public License, version 2.
	9	*/
	10
	11	#include <linux/init.h>
	12	#include <linux/kernel.h>
	13	#include <linux/module.h>
	14	#include <linux/i2c.h>
	15	#include <linux/i2c-gpio.h>
	16	#include <linux/interrupt.h>
	17	#include <linux/spinlock.h>
	18	#include <linux/slab.h>
	19	#include <linux/videodev2.h>
	20	#include <media/v4l2-device.h>
	21	#include <media/v4l2-chip-ident.h>
	22	#include <media/mmp-camera.h>
	23	#include <linux/device.h>
	24	#include <linux/platform_device.h>
	25	#include <linux/gpio.h>
	26	#include <linux/io.h>
	27	#include <linux/delay.h>
	28	#include <linux/list.h>
bb0a896e	29	#include <linux/pm.h>
67a8dbbc JC	30
	31	#include "mcam-core.h"
	32
e27412f5	33	MODULE_ALIAS("platform:mmp-camera");
67a8dbbc JC	34	MODULE_AUTHOR("Jonathan Corbet <corbet@lwn.net>");
	35	MODULE_LICENSE("GPL");
	36
	37	struct mmp_camera {
	38	void *power_regs;
	39	struct platform_device *pdev;
	40	struct mcam_camera mcam;
	41	struct list_head devlist;
	42	int irq;
	43	};
	44
	45	static inline struct mmp_camera mcam_to_cam(struct mcam_camera mcam)
	46	{
	47	return container_of(mcam, struct mmp_camera, mcam);
	48	}
	49
	50	/*
	51	* A silly little infrastructure so we can keep track of our devices.
	52	* Chances are that we will never have more than one of them, but
	53	* the Armada 610 does have two controllers...
	54	*/
	55
	56	static LIST_HEAD(mmpcam_devices);
	57	static struct mutex mmpcam_devices_lock;
	58
	59	static void mmpcam_add_device(struct mmp_camera *cam)
	60	{
	61	mutex_lock(&mmpcam_devices_lock);
	62	list_add(&cam->devlist, &mmpcam_devices);
	63	mutex_unlock(&mmpcam_devices_lock);
	64	}
	65
	66	static void mmpcam_remove_device(struct mmp_camera *cam)
	67	{
	68	mutex_lock(&mmpcam_devices_lock);
	69	list_del(&cam->devlist);
	70	mutex_unlock(&mmpcam_devices_lock);
	71	}
	72
	73	/*
	74	* Platform dev remove passes us a platform_device, and there's
	75	* no handy unused drvdata to stash a backpointer in. So just
	76	* dig it out of our list.
	77	*/
	78	static struct mmp_camera mmpcam_find_device(struct platform_device pdev)
	79	{
	80	struct mmp_camera *cam;
	81
	82	mutex_lock(&mmpcam_devices_lock);
	83	list_for_each_entry(cam, &mmpcam_devices, devlist) {
	84	if (cam->pdev == pdev) {
	85	mutex_unlock(&mmpcam_devices_lock);
	86	return cam;
	87	}
	88	}
	89	mutex_unlock(&mmpcam_devices_lock);
	90	return NULL;
	91	}
	92
	93
	94
	95
	96	/*
	97	* Power-related registers; this almost certainly belongs
98	* somewhere else.
99	*
100	* ARMADA 610 register manual, sec 7.2.1, p1842.
101	*/
102	#define CPU_SUBSYS_PMU_BASE 0xd4282800
103	#define REG_CCIC_DCGCR 0x28 /* CCIC dyn clock gate ctrl reg */
104	#define REG_CCIC_CRCR 0x50 /* CCIC clk reset ctrl reg */
105
106	/*
107	* Power control.
108	*/
4a0abfaa JC	109	static void mmpcam_power_up_ctlr(struct mmp_camera *cam)
	110	{
	111	iowrite32(0x3f, cam->power_regs + REG_CCIC_DCGCR);
	112	iowrite32(0x3805b, cam->power_regs + REG_CCIC_CRCR);
	113	mdelay(1);
	114	}
	115
67a8dbbc JC	116	static void mmpcam_power_up(struct mcam_camera *mcam)
	117	{
	118	struct mmp_camera *cam = mcam_to_cam(mcam);
	119	struct mmp_camera_platform_data *pdata;
	120	/*
	121	* Turn on power and clocks to the controller.
	122	*/
4a0abfaa	123	mmpcam_power_up_ctlr(cam);
67a8dbbc JC	124	/*
	125	* Provide power to the sensor.
	126	*/
	127	mcam_reg_write(mcam, REG_CLKCTRL, 0x60000002);
	128	pdata = cam->pdev->dev.platform_data;
	129	gpio_set_value(pdata->sensor_power_gpio, 1);
	130	mdelay(5);
	131	mcam_reg_clear_bit(mcam, REG_CTRL1, 0x10000000);
	132	gpio_set_value(pdata->sensor_reset_gpio, 0); /* reset is active low */
	133	mdelay(5);
	134	gpio_set_value(pdata->sensor_reset_gpio, 1); /* reset is active low */
	135	mdelay(5);
	136	}
	137
	138	static void mmpcam_power_down(struct mcam_camera *mcam)
	139	{
	140	struct mmp_camera *cam = mcam_to_cam(mcam);
	141	struct mmp_camera_platform_data *pdata;
	142	/*
	143	* Turn off clocks and set reset lines
	144	*/
	145	iowrite32(0, cam->power_regs + REG_CCIC_DCGCR);
	146	iowrite32(0, cam->power_regs + REG_CCIC_CRCR);
	147	/*
	148	* Shut down the sensor.
	149	*/
	150	pdata = cam->pdev->dev.platform_data;
	151	gpio_set_value(pdata->sensor_power_gpio, 0);
	152	gpio_set_value(pdata->sensor_reset_gpio, 0);
	153	}
	154
	155
	156	static irqreturn_t mmpcam_irq(int irq, void *data)
	157	{
	158	struct mcam_camera *mcam = data;
	159	unsigned int irqs, handled;
	160
	161	spin_lock(&mcam->dev_lock);
	162	irqs = mcam_reg_read(mcam, REG_IRQSTAT);
	163	handled = mccic_irq(mcam, irqs);
	164	spin_unlock(&mcam->dev_lock);
	165	return IRQ_RETVAL(handled);
	166	}
	167
	168
	169	static int mmpcam_probe(struct platform_device *pdev)
	170	{
	171	struct mmp_camera *cam;
	172	struct mcam_camera *mcam;
	173	struct resource *res;
	174	struct mmp_camera_platform_data *pdata;
	175	int ret;
	176
	177	cam = kzalloc(sizeof(*cam), GFP_KERNEL);
	178	if (cam == NULL)
	179	return -ENOMEM;
	180	cam->pdev = pdev;
	181	INIT_LIST_HEAD(&cam->devlist);
	182
	183	mcam = &cam->mcam;
67a8dbbc JC	184	mcam->plat_power_up = mmpcam_power_up;
	185	mcam->plat_power_down = mmpcam_power_down;
	186	mcam->dev = &pdev->dev;
	187	mcam->use_smbus = 0;
	188	mcam->chip_id = V4L2_IDENT_ARMADA610;
28720944	189	mcam->buffer_mode = B_DMA_sg;
67a8dbbc JC	190	spin_lock_init(&mcam->dev_lock);
	191	/*
	192	* Get our I/O memory.
	193	*/
	194	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	195	if (res == NULL) {
	196	dev_err(&pdev->dev, "no iomem resource!\n");
	197	ret = -ENODEV;
	198	goto out_free;
	199	}
	200	mcam->regs = ioremap(res->start, resource_size(res));
	201	if (mcam->regs == NULL) {
	202	dev_err(&pdev->dev, "MMIO ioremap fail\n");
	203	ret = -ENODEV;
	204	goto out_free;
	205	}
	206	/*
	207	* Power/clock memory is elsewhere; get it too. Perhaps this
	208	* should really be managed outside of this driver?
	209	*/
	210	res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
	211	if (res == NULL) {
	212	dev_err(&pdev->dev, "no power resource!\n");
	213	ret = -ENODEV;
	214	goto out_unmap1;
	215	}
	216	cam->power_regs = ioremap(res->start, resource_size(res));
	217	if (cam->power_regs == NULL) {
	218	dev_err(&pdev->dev, "power MMIO ioremap fail\n");
	219	ret = -ENODEV;
	220	goto out_unmap1;
	221	}
	222	/*
	223	* Find the i2c adapter. This assumes, of course, that the
	224	* i2c bus is already up and functioning.
	225	*/
	226	pdata = pdev->dev.platform_data;
	227	mcam->i2c_adapter = platform_get_drvdata(pdata->i2c_device);
	228	if (mcam->i2c_adapter == NULL) {
	229	ret = -ENODEV;
	230	dev_err(&pdev->dev, "No i2c adapter\n");
	231	goto out_unmap2;
	232	}
	233	/*
	234	* Sensor GPIO pins.
	235	*/
	236	ret = gpio_request(pdata->sensor_power_gpio, "cam-power");
	237	if (ret) {
	238	dev_err(&pdev->dev, "Can't get sensor power gpio %d",
	239	pdata->sensor_power_gpio);
	240	goto out_unmap2;
	241	}
	242	gpio_direction_output(pdata->sensor_power_gpio, 0);
	243	ret = gpio_request(pdata->sensor_reset_gpio, "cam-reset");
	244	if (ret) {
	245	dev_err(&pdev->dev, "Can't get sensor reset gpio %d",
	246	pdata->sensor_reset_gpio);
	247	goto out_gpio;
	248	}
	249	gpio_direction_output(pdata->sensor_reset_gpio, 0);
	250	/*
	251	* Power the device up and hand it off to the core.
	252	*/
	253	mmpcam_power_up(mcam);
254	ret = mccic_register(mcam);
255	if (ret)
256	goto out_gpio2;
257	/*
258	* Finally, set up our IRQ now that the core is ready to
259	* deal with it.
260	*/
261	res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
262	if (res == NULL) {
263	ret = -ENODEV;
264	goto out_unregister;
265	}
266	cam->irq = res->start;
267	ret = request_irq(cam->irq, mmpcam_irq, IRQF_SHARED,
268	"mmp-camera", mcam);
269	if (ret == 0) {
270	mmpcam_add_device(cam);
271	return 0;
272	}
273
274	out_unregister:
275	mccic_shutdown(mcam);
67a8dbbc	276	out_gpio2:
221a8248	277	mmpcam_power_down(mcam);
67a8dbbc JC	278	gpio_free(pdata->sensor_reset_gpio);
	279	out_gpio:
	280	gpio_free(pdata->sensor_power_gpio);
	281	out_unmap2:
	282	iounmap(cam->power_regs);
	283	out_unmap1:
	284	iounmap(mcam->regs);
	285	out_free:
	286	kfree(cam);
	287	return ret;
	288	}
	289
	290
	291	static int mmpcam_remove(struct mmp_camera *cam)
	292	{
	293	struct mcam_camera *mcam = &cam->mcam;
	294	struct mmp_camera_platform_data *pdata;
	295
	296	mmpcam_remove_device(cam);
	297	free_irq(cam->irq, mcam);
	298	mccic_shutdown(mcam);
	299	mmpcam_power_down(mcam);
	300	pdata = cam->pdev->dev.platform_data;
	301	gpio_free(pdata->sensor_reset_gpio);
	302	gpio_free(pdata->sensor_power_gpio);
	303	iounmap(cam->power_regs);
	304	iounmap(mcam->regs);
	305	kfree(cam);
	306	return 0;
	307	}
	308
	309	static int mmpcam_platform_remove(struct platform_device *pdev)
	310	{
	311	struct mmp_camera *cam = mmpcam_find_device(pdev);
	312
	313	if (cam == NULL)
	314	return -ENODEV;
	315	return mmpcam_remove(cam);
	316	}
	317
bb0a896e JC	318	/*
	319	* Suspend/resume support.
	320	*/
	321	#ifdef CONFIG_PM
	322
	323	static int mmpcam_suspend(struct platform_device *pdev, pm_message_t state)
	324	{
	325	struct mmp_camera *cam = mmpcam_find_device(pdev);
	326
	327	if (state.event != PM_EVENT_SUSPEND)
	328	return 0;
	329	mccic_suspend(&cam->mcam);
	330	return 0;
	331	}
	332
	333	static int mmpcam_resume(struct platform_device *pdev)
	334	{
	335	struct mmp_camera *cam = mmpcam_find_device(pdev);
	336
	337	/*
	338	* Power up unconditionally just in case the core tries to
	339	* touch a register even if nothing was active before; trust
	340	* me, it's better this way.
	341	*/
4a0abfaa	342	mmpcam_power_up_ctlr(cam);
bb0a896e JC	343	return mccic_resume(&cam->mcam);
	344	}
	345
	346	#endif
	347
67a8dbbc JC	348
	349	static struct platform_driver mmpcam_driver = {
	350	.probe = mmpcam_probe,
	351	.remove = mmpcam_platform_remove,
bb0a896e JC	352	#ifdef CONFIG_PM
	353	.suspend = mmpcam_suspend,
	354	.resume = mmpcam_resume,
	355	#endif
67a8dbbc JC	356	.driver = {
	357	.name = "mmp-camera",
	358	.owner = THIS_MODULE
	359	}
	360	};
	361
	362
	363	static int __init mmpcam_init_module(void)
	364	{
	365	mutex_init(&mmpcam_devices_lock);
	366	return platform_driver_register(&mmpcam_driver);
	367	}
	368
	369	static void __exit mmpcam_exit_module(void)
	370	{
	371	platform_driver_unregister(&mmpcam_driver);
	372	/*
	373	* platform_driver_unregister() should have emptied the list
	374	*/
	375	if (!list_empty(&mmpcam_devices))
	376	printk(KERN_ERR "mmp_camera leaving devices behind\n");
	377	}
	378
	379	module_init(mmpcam_init_module);
	380	module_exit(mmpcam_exit_module);