korg/linux
0
0
Fork 0
mirror of https://mirrors.bfsu.edu.cn/git/linux.git synced 2024-11-11 12:28:41 +08:00
Code Issues Packages Projects Releases Wiki Activity
23558d802a
linux/drivers/media/i2c/adp1653.c
Hans Verkuil b925fb423d media: i2c: adp1653: don't reuse the same node pointer 
The child device_node pointer was used for two different children.
This confused smatch, causing this warning:

drivers/media/i2c/adp1653.c:444 adp1653_of_init() warn: missing unwind goto?

Use two different pointers, one for each child node, and add separate
goto labels for each node as well. This also improves error logging
since it will now state for which node the property was missing.

Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Acked-by: Sakari Ailus <sakari.ailus@linux.intel.com>
[hverkuil: fix typo: childs -> children]
2023-10-12 10:12:54 +02:00

550 lines
14 KiB
C
Raw Blame History

// SPDX-License-Identifier: GPL-2.0-only
/*
* 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>
*
* 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 (fault < 0)
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 (rval < 0)
return rval;
flash->led_mode->val = V4L2_FLASH_LED_MODE_NONE;
rval = adp1653_update_hw(flash);
if (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 (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 (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 v4l2_subdev *subdev = dev_get_drvdata(dev);
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 v4l2_subdev *subdev = dev_get_drvdata(dev);
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 *node_indicator = NULL;
struct device_node *node_flash;
pd = devm_kzalloc(&client->dev, sizeof(*pd), GFP_KERNEL);
if (!pd)
return -ENOMEM;
flash->platform_data = pd;
node_flash = of_get_child_by_name(node, "flash");
if (!node_flash)
return -EINVAL;
if (of_property_read_u32(node_flash, "flash-timeout-us",
&pd->max_flash_timeout))
goto err;
if (of_property_read_u32(node_flash, "flash-max-microamp",
&pd->max_flash_intensity))
goto err;
pd->max_flash_intensity /= 1000;
if (of_property_read_u32(node_flash, "led-max-microamp",
&pd->max_torch_intensity))
goto err;
pd->max_torch_intensity /= 1000;
node_indicator = of_get_child_by_name(node, "indicator");
if (!node_indicator)
goto err;
if (of_property_read_u32(node_indicator, "led-max-microamp",
&pd->max_indicator_intensity))
goto err;
of_node_put(node_flash);
of_node_put(node_indicator);
pd->enable_gpio = devm_gpiod_get(&client->dev, "enable", GPIOD_OUT_LOW);
if (IS_ERR(pd->enable_gpio)) {
dev_err(&client->dev, "Error getting GPIO\n");
return PTR_ERR(pd->enable_gpio);
}
return 0;
err:
dev_err(&client->dev, "Required property not found\n");
of_node_put(node_flash);
of_node_put(node_indicator);
return -EINVAL;
}
static int adp1653_probe(struct i2c_client *client)
{
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 void 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);
}
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");
Reference in New Issue View Git Blame Copy Permalink