[linux-2.6-block.git] / drivers / media / i2c / adp1653.c

/*
 * drivers/media/i2c/adp1653.c
 *
 * Copyright (C) 2008--2011 Nokia Corporation
 *
 * Contact: Sakari Ailus <sakari.ailus@iki.fi>
 *
 * Contributors:
 *	Sakari Ailus <sakari.ailus@iki.fi>
 *	Tuukka Toivonen <tuukkat76@gmail.com>
 *	Pavel Machek <pavel@ucw.cz>
 *
 * 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.
 *
 * 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.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA
 *
 * TODO:
 * - fault interrupt handling
 * - hardware strobe
 * - power doesn't need to be ON if all lights are off
 *
 */

#include <linux/delay.h>
#include <linux/module.h>
#include <linux/i2c.h>
#include <linux/slab.h>
#include <linux/of.h>
#include <linux/gpio/consumer.h>
#include <media/i2c/adp1653.h>
#include <media/v4l2-device.h>

#define TIMEOUT_MAX		820000
#define TIMEOUT_STEP		54600
#define TIMEOUT_MIN		(TIMEOUT_MAX - ADP1653_REG_CONFIG_TMR_SET_MAX \
				 * TIMEOUT_STEP)
#define TIMEOUT_US_TO_CODE(t)	((TIMEOUT_MAX + (TIMEOUT_STEP / 2) - (t)) \
				 / TIMEOUT_STEP)
#define TIMEOUT_CODE_TO_US(c)	(TIMEOUT_MAX - (c) * TIMEOUT_STEP)

/* Write values into ADP1653 registers. */
static int adp1653_update_hw(struct adp1653_flash *flash)
{
	struct i2c_client *client = v4l2_get_subdevdata(&flash->subdev);
	u8 out_sel;
	u8 config = 0;
	int rval;

	out_sel = ADP1653_INDICATOR_INTENSITY_uA_TO_REG(
		flash->indicator_intensity->val)
		<< ADP1653_REG_OUT_SEL_ILED_SHIFT;

	switch (flash->led_mode->val) {
	case V4L2_FLASH_LED_MODE_NONE:
		break;
	case V4L2_FLASH_LED_MODE_FLASH:
		/* Flash mode, light on with strobe, duration from timer */
		config = ADP1653_REG_CONFIG_TMR_CFG;
		config |= TIMEOUT_US_TO_CODE(flash->flash_timeout->val)
			  << ADP1653_REG_CONFIG_TMR_SET_SHIFT;
		break;
	case V4L2_FLASH_LED_MODE_TORCH:
		/* Torch mode, light immediately on, duration indefinite */
		out_sel |= ADP1653_FLASH_INTENSITY_mA_TO_REG(
			flash->torch_intensity->val)
			<< ADP1653_REG_OUT_SEL_HPLED_SHIFT;
		break;
	}

	rval = i2c_smbus_write_byte_data(client, ADP1653_REG_OUT_SEL, out_sel);
	if (rval < 0)
		return rval;

	rval = i2c_smbus_write_byte_data(client, ADP1653_REG_CONFIG, config);
	if (rval < 0)
		return rval;

	return 0;
}

static int adp1653_get_fault(struct adp1653_flash *flash)
{
	struct i2c_client *client = v4l2_get_subdevdata(&flash->subdev);
	int fault;
	int rval;

	fault = i2c_smbus_read_byte_data(client, ADP1653_REG_FAULT);
	if (IS_ERR_VALUE(fault))
		return fault;

	flash->fault |= fault;

	if (!flash->fault)
		return 0;

	/* Clear faults. */
	rval = i2c_smbus_write_byte_data(client, ADP1653_REG_OUT_SEL, 0);
	if (IS_ERR_VALUE(rval))
		return rval;

	flash->led_mode->val = V4L2_FLASH_LED_MODE_NONE;

	rval = adp1653_update_hw(flash);
	if (IS_ERR_VALUE(rval))
		return rval;

	return flash->fault;
}

static int adp1653_strobe(struct adp1653_flash *flash, int enable)
{
	struct i2c_client *client = v4l2_get_subdevdata(&flash->subdev);
	u8 out_sel = ADP1653_INDICATOR_INTENSITY_uA_TO_REG(
		flash->indicator_intensity->val)
		<< ADP1653_REG_OUT_SEL_ILED_SHIFT;
	int rval;

	if (flash->led_mode->val != V4L2_FLASH_LED_MODE_FLASH)
		return -EBUSY;

	if (!enable)
		return i2c_smbus_write_byte_data(client, ADP1653_REG_OUT_SEL,
						 out_sel);

	out_sel |= ADP1653_FLASH_INTENSITY_mA_TO_REG(
		flash->flash_intensity->val)
		<< ADP1653_REG_OUT_SEL_HPLED_SHIFT;
	rval = i2c_smbus_write_byte_data(client, ADP1653_REG_OUT_SEL, out_sel);
	if (rval)
		return rval;

	/* Software strobe using i2c */
	rval = i2c_smbus_write_byte_data(client, ADP1653_REG_SW_STROBE,
		ADP1653_REG_SW_STROBE_SW_STROBE);
	if (rval)
		return rval;
	return i2c_smbus_write_byte_data(client, ADP1653_REG_SW_STROBE, 0);
}

/* --------------------------------------------------------------------------
 * V4L2 controls
 */

static int adp1653_get_ctrl(struct v4l2_ctrl *ctrl)
{
	struct adp1653_flash *flash =
		container_of(ctrl->handler, struct adp1653_flash, ctrls);
	int rval;

	rval = adp1653_get_fault(flash);
	if (IS_ERR_VALUE(rval))
		return rval;

	ctrl->cur.val = 0;

	if (flash->fault & ADP1653_REG_FAULT_FLT_SCP)
		ctrl->cur.val |= V4L2_FLASH_FAULT_SHORT_CIRCUIT;
	if (flash->fault & ADP1653_REG_FAULT_FLT_OT)
		ctrl->cur.val |= V4L2_FLASH_FAULT_OVER_TEMPERATURE;
	if (flash->fault & ADP1653_REG_FAULT_FLT_TMR)
		ctrl->cur.val |= V4L2_FLASH_FAULT_TIMEOUT;
	if (flash->fault & ADP1653_REG_FAULT_FLT_OV)
		ctrl->cur.val |= V4L2_FLASH_FAULT_OVER_VOLTAGE;

	flash->fault = 0;

	return 0;
}

static int adp1653_set_ctrl(struct v4l2_ctrl *ctrl)
{
	struct adp1653_flash *flash =
		container_of(ctrl->handler, struct adp1653_flash, ctrls);
	int rval;

	rval = adp1653_get_fault(flash);
	if (IS_ERR_VALUE(rval))
		return rval;
	if ((rval & (ADP1653_REG_FAULT_FLT_SCP |
		     ADP1653_REG_FAULT_FLT_OT |
		     ADP1653_REG_FAULT_FLT_OV)) &&
	    (ctrl->id == V4L2_CID_FLASH_STROBE ||
	     ctrl->id == V4L2_CID_FLASH_TORCH_INTENSITY ||
	     ctrl->id == V4L2_CID_FLASH_LED_MODE))
		return -EBUSY;

	switch (ctrl->id) {
	case V4L2_CID_FLASH_STROBE:
		return adp1653_strobe(flash, 1);
	case V4L2_CID_FLASH_STROBE_STOP:
		return adp1653_strobe(flash, 0);
	}

	return adp1653_update_hw(flash);
}

static const struct v4l2_ctrl_ops adp1653_ctrl_ops = {
	.g_volatile_ctrl = adp1653_get_ctrl,
	.s_ctrl = adp1653_set_ctrl,
};

static int adp1653_init_controls(struct adp1653_flash *flash)
{
	struct v4l2_ctrl *fault;

	v4l2_ctrl_handler_init(&flash->ctrls, 9);

	flash->led_mode =
		v4l2_ctrl_new_std_menu(&flash->ctrls, &adp1653_ctrl_ops,
				       V4L2_CID_FLASH_LED_MODE,
				       V4L2_FLASH_LED_MODE_TORCH, ~0x7, 0);
	v4l2_ctrl_new_std_menu(&flash->ctrls, &adp1653_ctrl_ops,
			       V4L2_CID_FLASH_STROBE_SOURCE,
			       V4L2_FLASH_STROBE_SOURCE_SOFTWARE, ~0x1, 0);
	v4l2_ctrl_new_std(&flash->ctrls, &adp1653_ctrl_ops,
			  V4L2_CID_FLASH_STROBE, 0, 0, 0, 0);
	v4l2_ctrl_new_std(&flash->ctrls, &adp1653_ctrl_ops,
			  V4L2_CID_FLASH_STROBE_STOP, 0, 0, 0, 0);
	flash->flash_timeout =
		v4l2_ctrl_new_std(&flash->ctrls, &adp1653_ctrl_ops,
				  V4L2_CID_FLASH_TIMEOUT, TIMEOUT_MIN,
				  flash->platform_data->max_flash_timeout,
				  TIMEOUT_STEP,
				  flash->platform_data->max_flash_timeout);
	flash->flash_intensity =
		v4l2_ctrl_new_std(&flash->ctrls, &adp1653_ctrl_ops,
				  V4L2_CID_FLASH_INTENSITY,
				  ADP1653_FLASH_INTENSITY_MIN,
				  flash->platform_data->max_flash_intensity,
				  1, flash->platform_data->max_flash_intensity);
	flash->torch_intensity =
		v4l2_ctrl_new_std(&flash->ctrls, &adp1653_ctrl_ops,
				  V4L2_CID_FLASH_TORCH_INTENSITY,
				  ADP1653_TORCH_INTENSITY_MIN,
				  flash->platform_data->max_torch_intensity,
				  ADP1653_FLASH_INTENSITY_STEP,
				  flash->platform_data->max_torch_intensity);
	flash->indicator_intensity =
		v4l2_ctrl_new_std(&flash->ctrls, &adp1653_ctrl_ops,
				  V4L2_CID_FLASH_INDICATOR_INTENSITY,
				  ADP1653_INDICATOR_INTENSITY_MIN,
				  flash->platform_data->max_indicator_intensity,
				  ADP1653_INDICATOR_INTENSITY_STEP,
				  ADP1653_INDICATOR_INTENSITY_MIN);
	fault = v4l2_ctrl_new_std(&flash->ctrls, &adp1653_ctrl_ops,
				  V4L2_CID_FLASH_FAULT, 0,
				  V4L2_FLASH_FAULT_OVER_VOLTAGE
				  | V4L2_FLASH_FAULT_OVER_TEMPERATURE
				  | V4L2_FLASH_FAULT_SHORT_CIRCUIT, 0, 0);

	if (flash->ctrls.error)
		return flash->ctrls.error;

	fault->flags |= V4L2_CTRL_FLAG_VOLATILE;

	flash->subdev.ctrl_handler = &flash->ctrls;
	return 0;
}

/* --------------------------------------------------------------------------
 * V4L2 subdev operations
 */

static int
adp1653_init_device(struct adp1653_flash *flash)
{
	struct i2c_client *client = v4l2_get_subdevdata(&flash->subdev);
	int rval;

	/* Clear FAULT register by writing zero to OUT_SEL */
	rval = i2c_smbus_write_byte_data(client, ADP1653_REG_OUT_SEL, 0);
	if (rval < 0) {
		dev_err(&client->dev, "failed writing fault register\n");
		return -EIO;
	}

	mutex_lock(flash->ctrls.lock);
	/* Reset faults before reading new ones. */
	flash->fault = 0;
	rval = adp1653_get_fault(flash);
	mutex_unlock(flash->ctrls.lock);
	if (rval > 0) {
		dev_err(&client->dev, "faults detected: 0x%1.1x\n", rval);
		return -EIO;
	}

	mutex_lock(flash->ctrls.lock);
	rval = adp1653_update_hw(flash);
	mutex_unlock(flash->ctrls.lock);
	if (rval) {
		dev_err(&client->dev,
			"adp1653_update_hw failed at %s\n", __func__);
		return -EIO;
	}

	return 0;
}

static int
__adp1653_set_power(struct adp1653_flash *flash, int on)
{
	int ret;

	if (flash->platform_data->power) {
		ret = flash->platform_data->power(&flash->subdev, on);
		if (ret < 0)
			return ret;
	} else {
		gpiod_set_value(flash->platform_data->enable_gpio, on);
		if (on)
			/* Some delay is apparently required. */
			udelay(20);
	}

	if (!on)
		return 0;

	ret = adp1653_init_device(flash);
	if (ret >= 0)
		return ret;

	if (flash->platform_data->power)
		flash->platform_data->power(&flash->subdev, 0);
	else
		gpiod_set_value(flash->platform_data->enable_gpio, 0);

	return ret;
}

static int
adp1653_set_power(struct v4l2_subdev *subdev, int on)
{
	struct adp1653_flash *flash = to_adp1653_flash(subdev);
	int ret = 0;

	mutex_lock(&flash->power_lock);

	/* If the power count is modified from 0 to != 0 or from != 0 to 0,
	 * update the power state.
	 */
	if (flash->power_count == !on) {
		ret = __adp1653_set_power(flash, !!on);
		if (ret < 0)
			goto done;
	}

	/* Update the power count. */
	flash->power_count += on ? 1 : -1;
	WARN_ON(flash->power_count < 0);

done:
	mutex_unlock(&flash->power_lock);
	return ret;
}

static int adp1653_open(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh)
{
	return adp1653_set_power(sd, 1);
}

static int adp1653_close(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh)
{
	return adp1653_set_power(sd, 0);
}

static const struct v4l2_subdev_core_ops adp1653_core_ops = {
	.s_power = adp1653_set_power,
};

static const struct v4l2_subdev_ops adp1653_ops = {
	.core = &adp1653_core_ops,
};

static const struct v4l2_subdev_internal_ops adp1653_internal_ops = {
	.open = adp1653_open,
	.close = adp1653_close,
};

/* --------------------------------------------------------------------------
 * I2C driver
 */
#ifdef CONFIG_PM

static int adp1653_suspend(struct device *dev)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct v4l2_subdev *subdev = i2c_get_clientdata(client);
	struct adp1653_flash *flash = to_adp1653_flash(subdev);

	if (!flash->power_count)
		return 0;

	return __adp1653_set_power(flash, 0);
}

static int adp1653_resume(struct device *dev)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct v4l2_subdev *subdev = i2c_get_clientdata(client);
	struct adp1653_flash *flash = to_adp1653_flash(subdev);

	if (!flash->power_count)
		return 0;

	return __adp1653_set_power(flash, 1);
}

#else

#define adp1653_suspend	NULL
#define adp1653_resume	NULL

#endif /* CONFIG_PM */

static int adp1653_of_init(struct i2c_client *client,
			   struct adp1653_flash *flash,
			   struct device_node *node)
{
	struct adp1653_platform_data *pd;
	struct device_node *child;

	pd = devm_kzalloc(&client->dev, sizeof(*pd), GFP_KERNEL);
	if (!pd)
		return -ENOMEM;
	flash->platform_data = pd;

	child = of_get_child_by_name(node, "flash");
	if (!child)
		return -EINVAL;

	if (of_property_read_u32(child, "flash-timeout-us",
				 &pd->max_flash_timeout))
		goto err;

	if (of_property_read_u32(child, "flash-max-microamp",
				 &pd->max_flash_intensity))
		goto err;

	pd->max_flash_intensity /= 1000;

	if (of_property_read_u32(child, "led-max-microamp",
				 &pd->max_torch_intensity))
		goto err;

	pd->max_torch_intensity /= 1000;
	of_node_put(child);

	child = of_get_child_by_name(node, "indicator");
	if (!child)
		return -EINVAL;

	if (of_property_read_u32(child, "led-max-microamp",
				 &pd->max_indicator_intensity))
		goto err;

	of_node_put(child);

	pd->enable_gpio = devm_gpiod_get(&client->dev, "enable", GPIOD_OUT_LOW);
	if (!pd->enable_gpio) {
		dev_err(&client->dev, "Error getting GPIO\n");
		return -EINVAL;
	}

	return 0;
err:
	dev_err(&client->dev, "Required property not found\n");
	of_node_put(child);
	return -EINVAL;
}


static int adp1653_probe(struct i2c_client *client,
			 const struct i2c_device_id *devid)
{
	struct adp1653_flash *flash;
	int ret;

	flash = devm_kzalloc(&client->dev, sizeof(*flash), GFP_KERNEL);
	if (flash == NULL)
		return -ENOMEM;

	if (client->dev.of_node) {
		ret = adp1653_of_init(client, flash, client->dev.of_node);
		if (ret)
			return ret;
	} else {
		if (!client->dev.platform_data) {
			dev_err(&client->dev,
				"Neither DT not platform data provided\n");
			return -EINVAL;
		}
		flash->platform_data = client->dev.platform_data;
	}

	mutex_init(&flash->power_lock);

	v4l2_i2c_subdev_init(&flash->subdev, client, &adp1653_ops);
	flash->subdev.internal_ops = &adp1653_internal_ops;
	flash->subdev.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;

	ret = adp1653_init_controls(flash);
	if (ret)
		goto free_and_quit;

	ret = media_entity_pads_init(&flash->subdev.entity, 0, NULL);
	if (ret < 0)
		goto free_and_quit;

	flash->subdev.entity.function = MEDIA_ENT_F_FLASH;

	return 0;

free_and_quit:
	dev_err(&client->dev, "adp1653: failed to register device\n");
	v4l2_ctrl_handler_free(&flash->ctrls);
	return ret;
}

static int adp1653_remove(struct i2c_client *client)
{
	struct v4l2_subdev *subdev = i2c_get_clientdata(client);
	struct adp1653_flash *flash = to_adp1653_flash(subdev);

	v4l2_device_unregister_subdev(&flash->subdev);
	v4l2_ctrl_handler_free(&flash->ctrls);
	media_entity_cleanup(&flash->subdev.entity);

	return 0;
}

static const struct i2c_device_id adp1653_id_table[] = {
	{ ADP1653_NAME, 0 },
	{ }
};
MODULE_DEVICE_TABLE(i2c, adp1653_id_table);

static const struct dev_pm_ops adp1653_pm_ops = {
	.suspend	= adp1653_suspend,
	.resume		= adp1653_resume,
};

static struct i2c_driver adp1653_i2c_driver = {
	.driver		= {
		.name	= ADP1653_NAME,
		.pm	= &adp1653_pm_ops,
	},
	.probe		= adp1653_probe,
	.remove		= adp1653_remove,
	.id_table	= adp1653_id_table,
};

module_i2c_driver(adp1653_i2c_driver);

MODULE_AUTHOR("Sakari Ailus <sakari.ailus@nokia.com>");
MODULE_DESCRIPTION("Analog Devices ADP1653 LED flash driver");
MODULE_LICENSE("GPL");
Commit	Line	Data
13abadad	1	/*
cb7a01ac	2	* drivers/media/i2c/adp1653.c
13abadad SA	3	*
	4	* Copyright (C) 2008--2011 Nokia Corporation
	5	*
8c5dff90	6	* Contact: Sakari Ailus <sakari.ailus@iki.fi>
13abadad SA	7	*
13abadad SA	8	* Contributors:
8c5dff90	9	* Sakari Ailus <sakari.ailus@iki.fi>
13abadad	10	* Tuukka Toivonen <tuukkat76@gmail.com>
074c57a2	11	* Pavel Machek <pavel@ucw.cz>
13abadad SA	12	*
	13	* This program is free software; you can redistribute it and/or
	14	* modify it under the terms of the GNU General Public License
	15	* version 2 as published by the Free Software Foundation.
	16	*
	17	* This program is distributed in the hope that it will be useful, but
	18	* WITHOUT ANY WARRANTY; without even the implied warranty of
	19	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	20	* General Public License for more details.
	21	*
	22	* You should have received a copy of the GNU General Public License
	23	* along with this program; if not, write to the Free Software
	24	* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
	25	* 02110-1301 USA
	26	*
	27	* TODO:
	28	* - fault interrupt handling
	29	* - hardware strobe
	30	* - power doesn't need to be ON if all lights are off
	31	*
	32	*/
	33
	34	#include <linux/delay.h>
7a707b89	35	#include <linux/module.h>
13abadad SA	36	#include <linux/i2c.h>
13abadad SA	37	#include <linux/slab.h>
074c57a2 PM	38	#include <linux/of.h>
074c57a2 PM	39	#include <linux/gpio/consumer.h>
b5dcee22	40	#include <media/i2c/adp1653.h>
13abadad SA	41	#include <media/v4l2-device.h>
	42
	43	#define TIMEOUT_MAX 820000
	44	#define TIMEOUT_STEP 54600
	45	#define TIMEOUT_MIN (TIMEOUT_MAX - ADP1653_REG_CONFIG_TMR_SET_MAX \
	46	* TIMEOUT_STEP)
	47	#define TIMEOUT_US_TO_CODE(t) ((TIMEOUT_MAX + (TIMEOUT_STEP / 2) - (t)) \
	48	/ TIMEOUT_STEP)
	49	#define TIMEOUT_CODE_TO_US(c) (TIMEOUT_MAX - (c) * TIMEOUT_STEP)
	50
	51	/* Write values into ADP1653 registers. */
	52	static int adp1653_update_hw(struct adp1653_flash *flash)
	53	{
	54	struct i2c_client *client = v4l2_get_subdevdata(&flash->subdev);
	55	u8 out_sel;
	56	u8 config = 0;
	57	int rval;
	58
	59	out_sel = ADP1653_INDICATOR_INTENSITY_uA_TO_REG(
	60	flash->indicator_intensity->val)
	61	<< ADP1653_REG_OUT_SEL_ILED_SHIFT;
	62
	63	switch (flash->led_mode->val) {
	64	case V4L2_FLASH_LED_MODE_NONE:
	65	break;
	66	case V4L2_FLASH_LED_MODE_FLASH:
	67	/* Flash mode, light on with strobe, duration from timer */
	68	config = ADP1653_REG_CONFIG_TMR_CFG;
	69	config \|= TIMEOUT_US_TO_CODE(flash->flash_timeout->val)
	70	<< ADP1653_REG_CONFIG_TMR_SET_SHIFT;
	71	break;
	72	case V4L2_FLASH_LED_MODE_TORCH:
	73	/* Torch mode, light immediately on, duration indefinite */
	74	out_sel \|= ADP1653_FLASH_INTENSITY_mA_TO_REG(
	75	flash->torch_intensity->val)
	76	<< ADP1653_REG_OUT_SEL_HPLED_SHIFT;
	77	break;
	78	}
	79
	80	rval = i2c_smbus_write_byte_data(client, ADP1653_REG_OUT_SEL, out_sel);
	81	if (rval < 0)
	82	return rval;
	83
	84	rval = i2c_smbus_write_byte_data(client, ADP1653_REG_CONFIG, config);
	85	if (rval < 0)
	86	return rval;
	87
	88	return 0;
	89	}
	90
	91	static int adp1653_get_fault(struct adp1653_flash *flash)
	92	{
	93	struct i2c_client *client = v4l2_get_subdevdata(&flash->subdev);
	94	int fault;
	95	int rval;
	96
	97	fault = i2c_smbus_read_byte_data(client, ADP1653_REG_FAULT);
	98	if (IS_ERR_VALUE(fault))
	99	return fault;
	100
	101	flash->fault \|= fault;
	102
	103	if (!flash->fault)
	104	return 0;
105
106	/* Clear faults. */
107	rval = i2c_smbus_write_byte_data(client, ADP1653_REG_OUT_SEL, 0);
108	if (IS_ERR_VALUE(rval))
109	return rval;
110
111	flash->led_mode->val = V4L2_FLASH_LED_MODE_NONE;
112
113	rval = adp1653_update_hw(flash);
114	if (IS_ERR_VALUE(rval))
115	return rval;
116
117	return flash->fault;
118	}
119
120	static int adp1653_strobe(struct adp1653_flash *flash, int enable)
121	{
122	struct i2c_client *client = v4l2_get_subdevdata(&flash->subdev);
123	u8 out_sel = ADP1653_INDICATOR_INTENSITY_uA_TO_REG(
124	flash->indicator_intensity->val)
125	<< ADP1653_REG_OUT_SEL_ILED_SHIFT;
126	int rval;
127
128	if (flash->led_mode->val != V4L2_FLASH_LED_MODE_FLASH)
129	return -EBUSY;
130
131	if (!enable)
132	return i2c_smbus_write_byte_data(client, ADP1653_REG_OUT_SEL,
133	out_sel);
134
135	out_sel \|= ADP1653_FLASH_INTENSITY_mA_TO_REG(
136	flash->flash_intensity->val)
137	<< ADP1653_REG_OUT_SEL_HPLED_SHIFT;
138	rval = i2c_smbus_write_byte_data(client, ADP1653_REG_OUT_SEL, out_sel);
139	if (rval)
140	return rval;
141
142	/* Software strobe using i2c */
143	rval = i2c_smbus_write_byte_data(client, ADP1653_REG_SW_STROBE,
144	ADP1653_REG_SW_STROBE_SW_STROBE);
145	if (rval)
146	return rval;
147	return i2c_smbus_write_byte_data(client, ADP1653_REG_SW_STROBE, 0);
148	}
149
150	/* --------------------------------------------------------------------------
151	* V4L2 controls
152	*/
153
154	static int adp1653_get_ctrl(struct v4l2_ctrl *ctrl)
155	{
156	struct adp1653_flash *flash =
157	container_of(ctrl->handler, struct adp1653_flash, ctrls);
158	int rval;
159
160	rval = adp1653_get_fault(flash);
161	if (IS_ERR_VALUE(rval))
162	return rval;
163
164	ctrl->cur.val = 0;
165
166	if (flash->fault & ADP1653_REG_FAULT_FLT_SCP)
167	ctrl->cur.val \|= V4L2_FLASH_FAULT_SHORT_CIRCUIT;
168	if (flash->fault & ADP1653_REG_FAULT_FLT_OT)
169	ctrl->cur.val \|= V4L2_FLASH_FAULT_OVER_TEMPERATURE;
170	if (flash->fault & ADP1653_REG_FAULT_FLT_TMR)
171	ctrl->cur.val \|= V4L2_FLASH_FAULT_TIMEOUT;
172	if (flash->fault & ADP1653_REG_FAULT_FLT_OV)
173	ctrl->cur.val \|= V4L2_FLASH_FAULT_OVER_VOLTAGE;
174
175	flash->fault = 0;
176
177	return 0;
178	}
179
180	static int adp1653_set_ctrl(struct v4l2_ctrl *ctrl)
181	{
182	struct adp1653_flash *flash =
183	container_of(ctrl->handler, struct adp1653_flash, ctrls);
184	int rval;
185
186	rval = adp1653_get_fault(flash);
187	if (IS_ERR_VALUE(rval))
188	return rval;
189	if ((rval & (ADP1653_REG_FAULT_FLT_SCP \|
190	ADP1653_REG_FAULT_FLT_OT \|
191	ADP1653_REG_FAULT_FLT_OV)) &&
192	(ctrl->id == V4L2_CID_FLASH_STROBE \|\|
193	ctrl->id == V4L2_CID_FLASH_TORCH_INTENSITY \|\|
194	ctrl->id == V4L2_CID_FLASH_LED_MODE))
195	return -EBUSY;
196
197	switch (ctrl->id) {
198	case V4L2_CID_FLASH_STROBE:
199	return adp1653_strobe(flash, 1);
200	case V4L2_CID_FLASH_STROBE_STOP:
201	return adp1653_strobe(flash, 0);
202	}
203
204	return adp1653_update_hw(flash);
205	}
206
207	static const struct v4l2_ctrl_ops adp1653_ctrl_ops = {
208	.g_volatile_ctrl = adp1653_get_ctrl,
209	.s_ctrl = adp1653_set_ctrl,
210	};
211
212	static int adp1653_init_controls(struct adp1653_flash *flash)
213	{
214	struct v4l2_ctrl *fault;
215
216	v4l2_ctrl_handler_init(&flash->ctrls, 9);
217
218	flash->led_mode =
219	v4l2_ctrl_new_std_menu(&flash->ctrls, &adp1653_ctrl_ops,
220	V4L2_CID_FLASH_LED_MODE,
221	V4L2_FLASH_LED_MODE_TORCH, ~0x7, 0);
222	v4l2_ctrl_new_std_menu(&flash->ctrls, &adp1653_ctrl_ops,
223	V4L2_CID_FLASH_STROBE_SOURCE,
224	V4L2_FLASH_STROBE_SOURCE_SOFTWARE, ~0x1, 0);
225	v4l2_ctrl_new_std(&flash->ctrls, &adp1653_ctrl_ops,
226	V4L2_CID_FLASH_STROBE, 0, 0, 0, 0);
227	v4l2_ctrl_new_std(&flash->ctrls, &adp1653_ctrl_ops,
228	V4L2_CID_FLASH_STROBE_STOP, 0, 0, 0, 0);
229	flash->flash_timeout =
230	v4l2_ctrl_new_std(&flash->ctrls, &adp1653_ctrl_ops,
231	V4L2_CID_FLASH_TIMEOUT, TIMEOUT_MIN,
232	flash->platform_data->max_flash_timeout,
233	TIMEOUT_STEP,
234	flash->platform_data->max_flash_timeout);
235	flash->flash_intensity =
236	v4l2_ctrl_new_std(&flash->ctrls, &adp1653_ctrl_ops,
237	V4L2_CID_FLASH_INTENSITY,
238	ADP1653_FLASH_INTENSITY_MIN,
239	flash->platform_data->max_flash_intensity,
240	1, flash->platform_data->max_flash_intensity);
241	flash->torch_intensity =
242	v4l2_ctrl_new_std(&flash->ctrls, &adp1653_ctrl_ops,
243	V4L2_CID_FLASH_TORCH_INTENSITY,
244	ADP1653_TORCH_INTENSITY_MIN,
245	flash->platform_data->max_torch_intensity,
246	ADP1653_FLASH_INTENSITY_STEP,
247	flash->platform_data->max_torch_intensity);
248	flash->indicator_intensity =
249	v4l2_ctrl_new_std(&flash->ctrls, &adp1653_ctrl_ops,
250	V4L2_CID_FLASH_INDICATOR_INTENSITY,
251	ADP1653_INDICATOR_INTENSITY_MIN,
252	flash->platform_data->max_indicator_intensity,
253	ADP1653_INDICATOR_INTENSITY_STEP,
254	ADP1653_INDICATOR_INTENSITY_MIN);
255	fault = v4l2_ctrl_new_std(&flash->ctrls, &adp1653_ctrl_ops,
256	V4L2_CID_FLASH_FAULT, 0,
257	V4L2_FLASH_FAULT_OVER_VOLTAGE
258	\| V4L2_FLASH_FAULT_OVER_TEMPERATURE
259	\| V4L2_FLASH_FAULT_SHORT_CIRCUIT, 0, 0);
260
261	if (flash->ctrls.error)
262	return flash->ctrls.error;
263
88365105	264	fault->flags \|= V4L2_CTRL_FLAG_VOLATILE;
13abadad SA	265
	266	flash->subdev.ctrl_handler = &flash->ctrls;
	267	return 0;
	268	}
	269
	270	/* --------------------------------------------------------------------------
	271	* V4L2 subdev operations
	272	*/
	273
	274	static int
	275	adp1653_init_device(struct adp1653_flash *flash)
	276	{
	277	struct i2c_client *client = v4l2_get_subdevdata(&flash->subdev);
	278	int rval;
	279
	280	/* Clear FAULT register by writing zero to OUT_SEL */
	281	rval = i2c_smbus_write_byte_data(client, ADP1653_REG_OUT_SEL, 0);
	282	if (rval < 0) {
	283	dev_err(&client->dev, "failed writing fault register\n");
	284	return -EIO;
	285	}
	286
77e7c4e6	287	mutex_lock(flash->ctrls.lock);
13abadad SA	288	/* Reset faults before reading new ones. */
	289	flash->fault = 0;
	290	rval = adp1653_get_fault(flash);
77e7c4e6	291	mutex_unlock(flash->ctrls.lock);
13abadad SA	292	if (rval > 0) {
	293	dev_err(&client->dev, "faults detected: 0x%1.1x\n", rval);
	294	return -EIO;
	295	}
	296
77e7c4e6	297	mutex_lock(flash->ctrls.lock);
13abadad	298	rval = adp1653_update_hw(flash);
77e7c4e6	299	mutex_unlock(flash->ctrls.lock);
13abadad SA	300	if (rval) {
	301	dev_err(&client->dev,
	302	"adp1653_update_hw failed at %s\n", __func__);
	303	return -EIO;
	304	}
	305
	306	return 0;
	307	}
	308
	309	static int
	310	__adp1653_set_power(struct adp1653_flash *flash, int on)
	311	{
be8e58d9	312	int ret;
13abadad	313
074c57a2 PM	314	if (flash->platform_data->power) {
	315	ret = flash->platform_data->power(&flash->subdev, on);
	316	if (ret < 0)
	317	return ret;
	318	} else {
	319	gpiod_set_value(flash->platform_data->enable_gpio, on);
	320	if (on)
	321	/* Some delay is apparently required. */
	322	udelay(20);
	323	}
13abadad SA	324
	325	if (!on)
	326	return 0;
	327
	328	ret = adp1653_init_device(flash);
074c57a2 PM	329	if (ret >= 0)
	330	return ret;
	331
	332	if (flash->platform_data->power)
13abadad	333	flash->platform_data->power(&flash->subdev, 0);
074c57a2 PM	334	else
074c57a2 PM	335	gpiod_set_value(flash->platform_data->enable_gpio, 0);
13abadad SA	336
	337	return ret;
	338	}
	339
	340	static int
	341	adp1653_set_power(struct v4l2_subdev *subdev, int on)
	342	{
	343	struct adp1653_flash *flash = to_adp1653_flash(subdev);
	344	int ret = 0;
	345
	346	mutex_lock(&flash->power_lock);
	347
	348	/* If the power count is modified from 0 to != 0 or from != 0 to 0,
	349	* update the power state.
	350	*/
	351	if (flash->power_count == !on) {
	352	ret = __adp1653_set_power(flash, !!on);
	353	if (ret < 0)
	354	goto done;
	355	}
	356
	357	/* Update the power count. */
	358	flash->power_count += on ? 1 : -1;
	359	WARN_ON(flash->power_count < 0);
	360
	361	done:
	362	mutex_unlock(&flash->power_lock);
	363	return ret;
	364	}
	365
	366	static int adp1653_open(struct v4l2_subdev sd, struct v4l2_subdev_fh fh)
	367	{
	368	return adp1653_set_power(sd, 1);
	369	}
	370
	371	static int adp1653_close(struct v4l2_subdev sd, struct v4l2_subdev_fh fh)
	372	{
	373	return adp1653_set_power(sd, 0);
	374	}
	375
	376	static const struct v4l2_subdev_core_ops adp1653_core_ops = {
	377	.s_power = adp1653_set_power,
	378	};
	379
	380	static const struct v4l2_subdev_ops adp1653_ops = {
	381	.core = &adp1653_core_ops,
	382	};
	383
	384	static const struct v4l2_subdev_internal_ops adp1653_internal_ops = {
	385	.open = adp1653_open,
	386	.close = adp1653_close,
	387	};
	388
	389	/* --------------------------------------------------------------------------
	390	* I2C driver
	391	*/
	392	#ifdef CONFIG_PM
	393
	394	static int adp1653_suspend(struct device *dev)
	395	{
	396	struct i2c_client *client = to_i2c_client(dev);
	397	struct v4l2_subdev *subdev = i2c_get_clientdata(client);
	398	struct adp1653_flash *flash = to_adp1653_flash(subdev);
	399
400	if (!flash->power_count)
401	return 0;
402
403	return __adp1653_set_power(flash, 0);
404	}
405
406	static int adp1653_resume(struct device *dev)
407	{
408	struct i2c_client *client = to_i2c_client(dev);
409	struct v4l2_subdev *subdev = i2c_get_clientdata(client);
410	struct adp1653_flash *flash = to_adp1653_flash(subdev);
411
412	if (!flash->power_count)
413	return 0;
414
415	return __adp1653_set_power(flash, 1);
416	}
417
418	#else
419
420	#define adp1653_suspend NULL
421	#define adp1653_resume NULL
422
423	#endif /* CONFIG_PM */
424
074c57a2 PM	425	static int adp1653_of_init(struct i2c_client *client,
	426	struct adp1653_flash *flash,
	427	struct device_node *node)
	428	{
	429	struct adp1653_platform_data *pd;
	430	struct device_node *child;
	431
	432	pd = devm_kzalloc(&client->dev, sizeof(*pd), GFP_KERNEL);
	433	if (!pd)
	434	return -ENOMEM;
	435	flash->platform_data = pd;
	436
	437	child = of_get_child_by_name(node, "flash");
	438	if (!child)
	439	return -EINVAL;
	440
	441	if (of_property_read_u32(child, "flash-timeout-us",
	442	&pd->max_flash_timeout))
	443	goto err;
	444
	445	if (of_property_read_u32(child, "flash-max-microamp",
	446	&pd->max_flash_intensity))
	447	goto err;
	448
	449	pd->max_flash_intensity /= 1000;
	450
	451	if (of_property_read_u32(child, "led-max-microamp",
	452	&pd->max_torch_intensity))
	453	goto err;
	454
	455	pd->max_torch_intensity /= 1000;
	456	of_node_put(child);
	457
	458	child = of_get_child_by_name(node, "indicator");
	459	if (!child)
	460	return -EINVAL;
	461
	462	if (of_property_read_u32(child, "led-max-microamp",
	463	&pd->max_indicator_intensity))
	464	goto err;
	465
	466	of_node_put(child);
	467
a33c380e	468	pd->enable_gpio = devm_gpiod_get(&client->dev, "enable", GPIOD_OUT_LOW);
074c57a2 PM	469	if (!pd->enable_gpio) {
	470	dev_err(&client->dev, "Error getting GPIO\n");
	471	return -EINVAL;
	472	}
	473
	474	return 0;
	475	err:
	476	dev_err(&client->dev, "Required property not found\n");
	477	of_node_put(child);
	478	return -EINVAL;
	479	}
	480
	481
13abadad SA	482	static int adp1653_probe(struct i2c_client *client,
	483	const struct i2c_device_id *devid)
	484	{
	485	struct adp1653_flash *flash;
	486	int ret;
	487
c02b211d	488	flash = devm_kzalloc(&client->dev, sizeof(*flash), GFP_KERNEL);
13abadad SA	489	if (flash == NULL)
	490	return -ENOMEM;
	491
074c57a2 PM	492	if (client->dev.of_node) {
	493	ret = adp1653_of_init(client, flash, client->dev.of_node);
	494	if (ret)
	495	return ret;
	496	} else {
	497	if (!client->dev.platform_data) {
	498	dev_err(&client->dev,
	499	"Neither DT not platform data provided\n");
b888d232	500	return -EINVAL;
074c57a2 PM	501	}
	502	flash->platform_data = client->dev.platform_data;
	503	}
13abadad SA	504
	505	mutex_init(&flash->power_lock);
	506
	507	v4l2_i2c_subdev_init(&flash->subdev, client, &adp1653_ops);
	508	flash->subdev.internal_ops = &adp1653_internal_ops;
	509	flash->subdev.flags \|= V4L2_SUBDEV_FL_HAS_DEVNODE;
	510
31ee95ec AS	511	ret = adp1653_init_controls(flash);
	512	if (ret)
	513	goto free_and_quit;
13abadad	514
ab22e77c	515	ret = media_entity_pads_init(&flash->subdev.entity, 0, NULL);
13abadad	516	if (ret < 0)
31ee95ec	517	goto free_and_quit;
13abadad	518
4ca72efa	519	flash->subdev.entity.function = MEDIA_ENT_F_FLASH;
be8e58d9	520
31ee95ec AS	521	return 0;
	522
	523	free_and_quit:
074c57a2	524	dev_err(&client->dev, "adp1653: failed to register device\n");
31ee95ec	525	v4l2_ctrl_handler_free(&flash->ctrls);
13abadad SA	526	return ret;
	527	}
	528
bf306900	529	static int adp1653_remove(struct i2c_client *client)
13abadad SA	530	{
	531	struct v4l2_subdev *subdev = i2c_get_clientdata(client);
	532	struct adp1653_flash *flash = to_adp1653_flash(subdev);
	533
	534	v4l2_device_unregister_subdev(&flash->subdev);
	535	v4l2_ctrl_handler_free(&flash->ctrls);
	536	media_entity_cleanup(&flash->subdev.entity);
c02b211d	537
13abadad SA	538	return 0;
	539	}
	540
	541	static const struct i2c_device_id adp1653_id_table[] = {
	542	{ ADP1653_NAME, 0 },
	543	{ }
	544	};
	545	MODULE_DEVICE_TABLE(i2c, adp1653_id_table);
	546
074c57a2	547	static const struct dev_pm_ops adp1653_pm_ops = {
13abadad SA	548	.suspend = adp1653_suspend,
	549	.resume = adp1653_resume,
	550	};
	551
	552	static struct i2c_driver adp1653_i2c_driver = {
	553	.driver = {
	554	.name = ADP1653_NAME,
	555	.pm = &adp1653_pm_ops,
	556	},
	557	.probe = adp1653_probe,
bf306900	558	.remove = adp1653_remove,
13abadad SA	559	.id_table = adp1653_id_table,
	560	};
	561
c6e8d86f	562	module_i2c_driver(adp1653_i2c_driver);
13abadad SA	563
	564	MODULE_AUTHOR("Sakari Ailus <sakari.ailus@nokia.com>");
	565	MODULE_DESCRIPTION("Analog Devices ADP1653 LED flash driver");
	566	MODULE_LICENSE("GPL");