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[media] adp1653: Add driver for LED flash controller

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This patch adds the driver for the adp1653 LED flash controller. This
controller supports a high power led in flash and torch modes and an
indicator light, sometimes also called privacy light.

The adp1653 is used on the Nokia N900.

Signed-off-by: Sakari Ailus <sakari.ailus@iki.fi>
Signed-off-by: Tuukka Toivonen <tuukkat76@gmail.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: David Cohen <dacohen@gmail.com>
Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Sakari Ailus 2011-05-05 15:39:25 -03:00 committed by Mauro Carvalho Chehab
parent 7ba85fa4fd
commit 13abadad17
4 changed files with 627 additions and 0 deletions
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9
drivers/media/video/Kconfig
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@ -489,6 +489,15 @@ config VIDEO_TCM825X
This is a driver for the Toshiba TCM825x VGA camera sensor.
It is used for example in Nokia N800.
comment "Flash devices"
config VIDEO_ADP1653
tristate "ADP1653 flash support"
depends on I2C && VIDEO_V4L2 && MEDIA_CONTROLLER
---help---
This is a driver for the ADP1653 flash controller. It is used for
example in Nokia N900.
comment "Video improvement chips"
config VIDEO_UPD64031A

1
drivers/media/video/Makefile
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@ -70,6 +70,7 @@ obj-$(CONFIG_VIDEO_MT9V032) += mt9v032.o
obj-$(CONFIG_VIDEO_SR030PC30) += sr030pc30.o
obj-$(CONFIG_VIDEO_NOON010PC30) += noon010pc30.o
obj-$(CONFIG_VIDEO_M5MOLS) += m5mols/
obj-$(CONFIG_VIDEO_ADP1653) += adp1653.o
obj-$(CONFIG_SOC_CAMERA_IMX074) += imx074.o
obj-$(CONFIG_SOC_CAMERA_MT9M001) += mt9m001.o

491
drivers/media/video/adp1653.c Normal file
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@ -0,0 +1,491 @@
/*
* drivers/media/video/adp1653.c
*
* Copyright (C) 2008--2011 Nokia Corporation
*
* Contact: Sakari Ailus <sakari.ailus@maxwell.research.nokia.com>
*
* Contributors:
* Sakari Ailus <sakari.ailus@maxwell.research.nokia.com>
* Tuukka Toivonen <tuukkat76@gmail.com>
*
* 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/i2c.h>
#include <linux/slab.h>
#include <linux/version.h>
#include <media/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->is_volatile = 1;
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;
ret = flash->platform_data->power(&flash->subdev, on);
if (ret < 0)
return ret;
if (!on)
return 0;
ret = adp1653_init_device(flash);
if (ret < 0)
flash->platform_data->power(&flash->subdev, 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_probe(struct i2c_client *client,
const struct i2c_device_id *devid)
{
struct adp1653_flash *flash;
int ret;
flash = kzalloc(sizeof(*flash), GFP_KERNEL);
if (flash == NULL)
return -ENOMEM;
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;
adp1653_init_controls(flash);
ret = media_entity_init(&flash->subdev.entity, 0, NULL, 0);
if (ret < 0)
kfree(flash);
return ret;
}
static int __exit 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);
kfree(flash);
return 0;
}
static const struct i2c_device_id adp1653_id_table[] = {
{ ADP1653_NAME, 0 },
{ }
};
MODULE_DEVICE_TABLE(i2c, adp1653_id_table);
static 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 = __exit_p(adp1653_remove),
.id_table = adp1653_id_table,
};
static int __init adp1653_init(void)
{
int rval;
rval = i2c_add_driver(&adp1653_i2c_driver);
if (rval)
printk(KERN_ALERT "%s: failed at i2c_add_driver\n", __func__);
return rval;
}
static void __exit adp1653_exit(void)
{
i2c_del_driver(&adp1653_i2c_driver);
}
module_init(adp1653_init);
module_exit(adp1653_exit);
MODULE_AUTHOR("Sakari Ailus <sakari.ailus@nokia.com>");
MODULE_DESCRIPTION("Analog Devices ADP1653 LED flash driver");
MODULE_LICENSE("GPL");

126
include/media/adp1653.h Normal file
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@ -0,0 +1,126 @@
/*
* include/media/adp1653.h
*
* Copyright (C) 2008--2011 Nokia Corporation
*
* Contact: Sakari Ailus <sakari.ailus@maxwell.research.nokia.com>
*
* Contributors:
* Sakari Ailus <sakari.ailus@maxwell.research.nokia.com>
* Tuukka Toivonen <tuukkat76@gmail.com>
*
* 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
*
*/
#ifndef ADP1653_H
#define ADP1653_H
#include <linux/i2c.h>
#include <linux/mutex.h>
#include <linux/videodev2.h>
#include <media/v4l2-ctrls.h>
#include <media/v4l2-subdev.h>
#define ADP1653_NAME "adp1653"
#define ADP1653_I2C_ADDR (0x60 >> 1)
/* Register definitions */
#define ADP1653_REG_OUT_SEL 0x00
#define ADP1653_REG_OUT_SEL_HPLED_TORCH_MIN 0x01
#define ADP1653_REG_OUT_SEL_HPLED_TORCH_MAX 0x0b
#define ADP1653_REG_OUT_SEL_HPLED_FLASH_MIN 0x0c
#define ADP1653_REG_OUT_SEL_HPLED_FLASH_MAX 0x1f
#define ADP1653_REG_OUT_SEL_HPLED_SHIFT 3
#define ADP1653_REG_OUT_SEL_ILED_MAX 0x07
#define ADP1653_REG_OUT_SEL_ILED_SHIFT 0
#define ADP1653_REG_CONFIG 0x01
#define ADP1653_REG_CONFIG_TMR_CFG (1 << 4)
#define ADP1653_REG_CONFIG_TMR_SET_MAX 0x0f
#define ADP1653_REG_CONFIG_TMR_SET_SHIFT 0
#define ADP1653_REG_SW_STROBE 0x02
#define ADP1653_REG_SW_STROBE_SW_STROBE (1 << 0)
#define ADP1653_REG_FAULT 0x03
#define ADP1653_REG_FAULT_FLT_SCP (1 << 3)
#define ADP1653_REG_FAULT_FLT_OT (1 << 2)
#define ADP1653_REG_FAULT_FLT_TMR (1 << 1)
#define ADP1653_REG_FAULT_FLT_OV (1 << 0)
#define ADP1653_INDICATOR_INTENSITY_MIN 0
#define ADP1653_INDICATOR_INTENSITY_STEP 2500
#define ADP1653_INDICATOR_INTENSITY_MAX \
(ADP1653_REG_OUT_SEL_ILED_MAX * ADP1653_INDICATOR_INTENSITY_STEP)
#define ADP1653_INDICATOR_INTENSITY_uA_TO_REG(a) \
((a) / ADP1653_INDICATOR_INTENSITY_STEP)
#define ADP1653_INDICATOR_INTENSITY_REG_TO_uA(a) \
((a) * ADP1653_INDICATOR_INTENSITY_STEP)
#define ADP1653_FLASH_INTENSITY_BASE 35
#define ADP1653_FLASH_INTENSITY_STEP 15
#define ADP1653_FLASH_INTENSITY_MIN \
(ADP1653_FLASH_INTENSITY_BASE \
+ ADP1653_REG_OUT_SEL_HPLED_FLASH_MIN * ADP1653_FLASH_INTENSITY_STEP)
#define ADP1653_FLASH_INTENSITY_MAX \
(ADP1653_FLASH_INTENSITY_MIN + \
(ADP1653_REG_OUT_SEL_HPLED_FLASH_MAX - \
ADP1653_REG_OUT_SEL_HPLED_FLASH_MIN + 1) * \
ADP1653_FLASH_INTENSITY_STEP)
#define ADP1653_FLASH_INTENSITY_mA_TO_REG(a) \
((a) < ADP1653_FLASH_INTENSITY_BASE ? 0 : \
(((a) - ADP1653_FLASH_INTENSITY_BASE) / ADP1653_FLASH_INTENSITY_STEP))
#define ADP1653_FLASH_INTENSITY_REG_TO_mA(a) \
((a) * ADP1653_FLASH_INTENSITY_STEP + ADP1653_FLASH_INTENSITY_BASE)
#define ADP1653_TORCH_INTENSITY_MIN \
(ADP1653_FLASH_INTENSITY_BASE \
+ ADP1653_REG_OUT_SEL_HPLED_TORCH_MIN * ADP1653_FLASH_INTENSITY_STEP)
#define ADP1653_TORCH_INTENSITY_MAX \
(ADP1653_TORCH_INTENSITY_MIN + \
(ADP1653_REG_OUT_SEL_HPLED_TORCH_MAX - \
ADP1653_REG_OUT_SEL_HPLED_TORCH_MIN + 1) * \
ADP1653_FLASH_INTENSITY_STEP)
struct adp1653_platform_data {
int (*power)(struct v4l2_subdev *sd, int on);
u32 max_flash_timeout; /* flash light timeout in us */
u32 max_flash_intensity; /* led intensity, flash mode */
u32 max_torch_intensity; /* led intensity, torch mode */
u32 max_indicator_intensity; /* indicator led intensity */
};
#define to_adp1653_flash(sd) container_of(sd, struct adp1653_flash, subdev)
struct adp1653_flash {
struct v4l2_subdev subdev;
struct adp1653_platform_data *platform_data;
struct v4l2_ctrl_handler ctrls;
struct v4l2_ctrl *led_mode;
struct v4l2_ctrl *flash_timeout;
struct v4l2_ctrl *flash_intensity;
struct v4l2_ctrl *torch_intensity;
struct v4l2_ctrl *indicator_intensity;
struct mutex power_lock;
int power_count;
int fault;
};
#endif /* ADP1653_H */