415 lines
11 KiB
C
415 lines
11 KiB
C
|
/*
|
||
|
|
* drivers/media/i2c/lm3646.c
|
||
|
|
* General device driver for TI lm3646, Dual FLASH LED Driver
|
||
|
|
*
|
||
|
|
* Copyright (C) 2014 Texas Instruments
|
||
|
|
*
|
||
|
|
* Contact: Daniel Jeong <gshark.jeong@gmail.com>
|
||
|
|
* Ldd-Mlp <ldd-mlp@list.ti.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.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include <linux/delay.h>
|
||
|
|
#include <linux/i2c.h>
|
||
|
|
#include <linux/module.h>
|
||
|
|
#include <linux/slab.h>
|
||
|
|
#include <linux/regmap.h>
|
||
|
|
#include <linux/videodev2.h>
|
||
|
|
#include <media/i2c/lm3646.h>
|
||
|
|
#include <media/v4l2-ctrls.h>
|
||
|
|
#include <media/v4l2-device.h>
|
||
|
|
|
||
|
|
/* registers definitions */
|
||
|
|
#define REG_ENABLE 0x01
|
||
|
|
#define REG_TORCH_BR 0x05
|
||
|
|
#define REG_FLASH_BR 0x05
|
||
|
|
#define REG_FLASH_TOUT 0x04
|
||
|
|
#define REG_FLAG 0x08
|
||
|
|
#define REG_STROBE_SRC 0x06
|
||
|
|
#define REG_LED1_FLASH_BR 0x06
|
||
|
|
#define REG_LED1_TORCH_BR 0x07
|
||
|
|
|
||
|
|
#define MASK_ENABLE 0x03
|
||
|
|
#define MASK_TORCH_BR 0x70
|
||
|
|
#define MASK_FLASH_BR 0x0F
|
||
|
|
#define MASK_FLASH_TOUT 0x07
|
||
|
|
#define MASK_FLAG 0xFF
|
||
|
|
#define MASK_STROBE_SRC 0x80
|
||
|
|
|
||
|
|
/* Fault Mask */
|
||
|
|
#define FAULT_TIMEOUT (1<<0)
|
||
|
|
#define FAULT_SHORT_CIRCUIT (1<<1)
|
||
|
|
#define FAULT_UVLO (1<<2)
|
||
|
|
#define FAULT_IVFM (1<<3)
|
||
|
|
#define FAULT_OCP (1<<4)
|
||
|
|
#define FAULT_OVERTEMP (1<<5)
|
||
|
|
#define FAULT_NTC_TRIP (1<<6)
|
||
|
|
#define FAULT_OVP (1<<7)
|
||
|
|
|
||
|
|
enum led_mode {
|
||
|
|
MODE_SHDN = 0x0,
|
||
|
|
MODE_TORCH = 0x2,
|
||
|
|
MODE_FLASH = 0x3,
|
||
|
|
};
|
||
|
|
|
||
|
|
/*
|
||
|
|
* struct lm3646_flash
|
||
|
|
*
|
||
|
|
* @pdata: platform data
|
||
|
|
* @regmap: reg. map for i2c
|
||
|
|
* @lock: muxtex for serial access.
|
||
|
|
* @led_mode: V4L2 LED mode
|
||
|
|
* @ctrls_led: V4L2 contols
|
||
|
|
* @subdev_led: V4L2 subdev
|
||
|
|
* @mode_reg : mode register value
|
||
|
|
*/
|
||
|
|
struct lm3646_flash {
|
||
|
|
struct device *dev;
|
||
|
|
struct lm3646_platform_data *pdata;
|
||
|
|
struct regmap *regmap;
|
||
|
|
|
||
|
|
struct v4l2_ctrl_handler ctrls_led;
|
||
|
|
struct v4l2_subdev subdev_led;
|
||
|
|
|
||
|
|
u8 mode_reg;
|
||
|
|
};
|
||
|
|
|
||
|
|
#define to_lm3646_flash(_ctrl) \
|
||
|
|
container_of(_ctrl->handler, struct lm3646_flash, ctrls_led)
|
||
|
|
|
||
|
|
/* enable mode control */
|
||
|
|
static int lm3646_mode_ctrl(struct lm3646_flash *flash,
|
||
|
|
enum v4l2_flash_led_mode led_mode)
|
||
|
|
{
|
||
|
|
switch (led_mode) {
|
||
|
|
case V4L2_FLASH_LED_MODE_NONE:
|
||
|
|
return regmap_write(flash->regmap,
|
||
|
|
REG_ENABLE, flash->mode_reg | MODE_SHDN);
|
||
|
|
case V4L2_FLASH_LED_MODE_TORCH:
|
||
|
|
return regmap_write(flash->regmap,
|
||
|
|
REG_ENABLE, flash->mode_reg | MODE_TORCH);
|
||
|
|
case V4L2_FLASH_LED_MODE_FLASH:
|
||
|
|
return regmap_write(flash->regmap,
|
||
|
|
REG_ENABLE, flash->mode_reg | MODE_FLASH);
|
||
|
|
}
|
||
|
|
return -EINVAL;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* V4L2 controls */
|
||
|
|
static int lm3646_get_ctrl(struct v4l2_ctrl *ctrl)
|
||
|
|
{
|
||
|
|
struct lm3646_flash *flash = to_lm3646_flash(ctrl);
|
||
|
|
unsigned int reg_val;
|
||
|
|
int rval;
|
||
|
|
|
||
|
|
if (ctrl->id != V4L2_CID_FLASH_FAULT)
|
||
|
|
return -EINVAL;
|
||
|
|
|
||
|
|
rval = regmap_read(flash->regmap, REG_FLAG, ®_val);
|
||
|
|
if (rval < 0)
|
||
|
|
return rval;
|
||
|
|
|
||
|
|
ctrl->val = 0;
|
||
|
|
if (reg_val & FAULT_TIMEOUT)
|
||
|
|
ctrl->val |= V4L2_FLASH_FAULT_TIMEOUT;
|
||
|
|
if (reg_val & FAULT_SHORT_CIRCUIT)
|
||
|
|
ctrl->val |= V4L2_FLASH_FAULT_SHORT_CIRCUIT;
|
||
|
|
if (reg_val & FAULT_UVLO)
|
||
|
|
ctrl->val |= V4L2_FLASH_FAULT_UNDER_VOLTAGE;
|
||
|
|
if (reg_val & FAULT_IVFM)
|
||
|
|
ctrl->val |= V4L2_FLASH_FAULT_INPUT_VOLTAGE;
|
||
|
|
if (reg_val & FAULT_OCP)
|
||
|
|
ctrl->val |= V4L2_FLASH_FAULT_OVER_CURRENT;
|
||
|
|
if (reg_val & FAULT_OVERTEMP)
|
||
|
|
ctrl->val |= V4L2_FLASH_FAULT_OVER_TEMPERATURE;
|
||
|
|
if (reg_val & FAULT_NTC_TRIP)
|
||
|
|
ctrl->val |= V4L2_FLASH_FAULT_LED_OVER_TEMPERATURE;
|
||
|
|
if (reg_val & FAULT_OVP)
|
||
|
|
ctrl->val |= V4L2_FLASH_FAULT_OVER_VOLTAGE;
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int lm3646_set_ctrl(struct v4l2_ctrl *ctrl)
|
||
|
|
{
|
||
|
|
struct lm3646_flash *flash = to_lm3646_flash(ctrl);
|
||
|
|
unsigned int reg_val;
|
||
|
|
int rval = -EINVAL;
|
||
|
|
|
||
|
|
switch (ctrl->id) {
|
||
|
|
case V4L2_CID_FLASH_LED_MODE:
|
||
|
|
|
||
|
|
if (ctrl->val != V4L2_FLASH_LED_MODE_FLASH)
|
||
|
|
return lm3646_mode_ctrl(flash, ctrl->val);
|
||
|
|
/* switch to SHDN mode before flash strobe on */
|
||
|
|
return lm3646_mode_ctrl(flash, V4L2_FLASH_LED_MODE_NONE);
|
||
|
|
|
||
|
|
case V4L2_CID_FLASH_STROBE_SOURCE:
|
||
|
|
return regmap_update_bits(flash->regmap,
|
||
|
|
REG_STROBE_SRC, MASK_STROBE_SRC,
|
||
|
|
(ctrl->val) << 7);
|
||
|
|
|
||
|
|
case V4L2_CID_FLASH_STROBE:
|
||
|
|
|
||
|
|
/* read and check current mode of chip to start flash */
|
||
|
|
rval = regmap_read(flash->regmap, REG_ENABLE, ®_val);
|
||
|
|
if (rval < 0 || ((reg_val & MASK_ENABLE) != MODE_SHDN))
|
||
|
|
return rval;
|
||
|
|
/* flash on */
|
||
|
|
return lm3646_mode_ctrl(flash, V4L2_FLASH_LED_MODE_FLASH);
|
||
|
|
|
||
|
|
case V4L2_CID_FLASH_STROBE_STOP:
|
||
|
|
|
||
|
|
/*
|
||
|
|
* flash mode will be turned automatically
|
||
|
|
* from FLASH mode to SHDN mode after flash duration timeout
|
||
|
|
* read and check current mode of chip to stop flash
|
||
|
|
*/
|
||
|
|
rval = regmap_read(flash->regmap, REG_ENABLE, ®_val);
|
||
|
|
if (rval < 0)
|
||
|
|
return rval;
|
||
|
|
if ((reg_val & MASK_ENABLE) == MODE_FLASH)
|
||
|
|
return lm3646_mode_ctrl(flash,
|
||
|
|
V4L2_FLASH_LED_MODE_NONE);
|
||
|
|
return rval;
|
||
|
|
|
||
|
|
case V4L2_CID_FLASH_TIMEOUT:
|
||
|
|
return regmap_update_bits(flash->regmap,
|
||
|
|
REG_FLASH_TOUT, MASK_FLASH_TOUT,
|
||
|
|
LM3646_FLASH_TOUT_ms_TO_REG
|
||
|
|
(ctrl->val));
|
||
|
|
|
||
|
|
case V4L2_CID_FLASH_INTENSITY:
|
||
|
|
return regmap_update_bits(flash->regmap,
|
||
|
|
REG_FLASH_BR, MASK_FLASH_BR,
|
||
|
|
LM3646_TOTAL_FLASH_BRT_uA_TO_REG
|
||
|
|
(ctrl->val));
|
||
|
|
|
||
|
|
case V4L2_CID_FLASH_TORCH_INTENSITY:
|
||
|
|
return regmap_update_bits(flash->regmap,
|
||
|
|
REG_TORCH_BR, MASK_TORCH_BR,
|
||
|
|
LM3646_TOTAL_TORCH_BRT_uA_TO_REG
|
||
|
|
(ctrl->val) << 4);
|
||
|
|
}
|
||
|
|
|
||
|
|
return -EINVAL;
|
||
|
|
}
|
||
|
|
|
||
|
|
static const struct v4l2_ctrl_ops lm3646_led_ctrl_ops = {
|
||
|
|
.g_volatile_ctrl = lm3646_get_ctrl,
|
||
|
|
.s_ctrl = lm3646_set_ctrl,
|
||
|
|
};
|
||
|
|
|
||
|
|
static int lm3646_init_controls(struct lm3646_flash *flash)
|
||
|
|
{
|
||
|
|
struct v4l2_ctrl *fault;
|
||
|
|
struct v4l2_ctrl_handler *hdl = &flash->ctrls_led;
|
||
|
|
const struct v4l2_ctrl_ops *ops = &lm3646_led_ctrl_ops;
|
||
|
|
|
||
|
|
v4l2_ctrl_handler_init(hdl, 8);
|
||
|
|
/* flash mode */
|
||
|
|
v4l2_ctrl_new_std_menu(hdl, ops, V4L2_CID_FLASH_LED_MODE,
|
||
|
|
V4L2_FLASH_LED_MODE_TORCH, ~0x7,
|
||
|
|
V4L2_FLASH_LED_MODE_NONE);
|
||
|
|
|
||
|
|
/* flash source */
|
||
|
|
v4l2_ctrl_new_std_menu(hdl, ops, V4L2_CID_FLASH_STROBE_SOURCE,
|
||
|
|
0x1, ~0x3, V4L2_FLASH_STROBE_SOURCE_SOFTWARE);
|
||
|
|
|
||
|
|
/* flash strobe */
|
||
|
|
v4l2_ctrl_new_std(hdl, ops, V4L2_CID_FLASH_STROBE, 0, 0, 0, 0);
|
||
|
|
/* flash strobe stop */
|
||
|
|
v4l2_ctrl_new_std(hdl, ops, V4L2_CID_FLASH_STROBE_STOP, 0, 0, 0, 0);
|
||
|
|
|
||
|
|
/* flash strobe timeout */
|
||
|
|
v4l2_ctrl_new_std(hdl, ops, V4L2_CID_FLASH_TIMEOUT,
|
||
|
|
LM3646_FLASH_TOUT_MIN,
|
||
|
|
LM3646_FLASH_TOUT_MAX,
|
||
|
|
LM3646_FLASH_TOUT_STEP, flash->pdata->flash_timeout);
|
||
|
|
|
||
|
|
/* max flash current */
|
||
|
|
v4l2_ctrl_new_std(hdl, ops, V4L2_CID_FLASH_INTENSITY,
|
||
|
|
LM3646_TOTAL_FLASH_BRT_MIN,
|
||
|
|
LM3646_TOTAL_FLASH_BRT_MAX,
|
||
|
|
LM3646_TOTAL_FLASH_BRT_STEP,
|
||
|
|
LM3646_TOTAL_FLASH_BRT_MAX);
|
||
|
|
|
||
|
|
/* max torch current */
|
||
|
|
v4l2_ctrl_new_std(hdl, ops, V4L2_CID_FLASH_TORCH_INTENSITY,
|
||
|
|
LM3646_TOTAL_TORCH_BRT_MIN,
|
||
|
|
LM3646_TOTAL_TORCH_BRT_MAX,
|
||
|
|
LM3646_TOTAL_TORCH_BRT_STEP,
|
||
|
|
LM3646_TOTAL_TORCH_BRT_MAX);
|
||
|
|
|
||
|
|
/* fault */
|
||
|
|
fault = v4l2_ctrl_new_std(hdl, ops, V4L2_CID_FLASH_FAULT, 0,
|
||
|
|
V4L2_FLASH_FAULT_OVER_VOLTAGE
|
||
|
|
| V4L2_FLASH_FAULT_OVER_TEMPERATURE
|
||
|
|
| V4L2_FLASH_FAULT_SHORT_CIRCUIT
|
||
|
|
| V4L2_FLASH_FAULT_TIMEOUT, 0, 0);
|
||
|
|
if (fault != NULL)
|
||
|
|
fault->flags |= V4L2_CTRL_FLAG_VOLATILE;
|
||
|
|
|
||
|
|
if (hdl->error)
|
||
|
|
return hdl->error;
|
||
|
|
|
||
|
|
flash->subdev_led.ctrl_handler = hdl;
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* initialize device */
|
||
|
|
static const struct v4l2_subdev_ops lm3646_ops = {
|
||
|
|
.core = NULL,
|
||
|
|
};
|
||
|
|
|
||
|
|
static const struct regmap_config lm3646_regmap = {
|
||
|
|
.reg_bits = 8,
|
||
|
|
.val_bits = 8,
|
||
|
|
.max_register = 0xFF,
|
||
|
|
};
|
||
|
|
|
||
|
|
static int lm3646_subdev_init(struct lm3646_flash *flash)
|
||
|
|
{
|
||
|
|
struct i2c_client *client = to_i2c_client(flash->dev);
|
||
|
|
int rval;
|
||
|
|
|
||
|
|
v4l2_i2c_subdev_init(&flash->subdev_led, client, &lm3646_ops);
|
||
|
|
flash->subdev_led.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
|
||
|
|
strcpy(flash->subdev_led.name, LM3646_NAME);
|
||
|
|
rval = lm3646_init_controls(flash);
|
||
|
|
if (rval)
|
||
|
|
goto err_out;
|
||
|
|
rval = media_entity_pads_init(&flash->subdev_led.entity, 0, NULL);
|
||
|
|
if (rval < 0)
|
||
|
|
goto err_out;
|
||
|
|
flash->subdev_led.entity.function = MEDIA_ENT_F_FLASH;
|
||
|
|
return rval;
|
||
|
|
|
||
|
|
err_out:
|
||
|
|
v4l2_ctrl_handler_free(&flash->ctrls_led);
|
||
|
|
return rval;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int lm3646_init_device(struct lm3646_flash *flash)
|
||
|
|
{
|
||
|
|
unsigned int reg_val;
|
||
|
|
int rval;
|
||
|
|
|
||
|
|
/* read the value of mode register to reduce redundant i2c accesses */
|
||
|
|
rval = regmap_read(flash->regmap, REG_ENABLE, ®_val);
|
||
|
|
if (rval < 0)
|
||
|
|
return rval;
|
||
|
|
flash->mode_reg = reg_val & 0xfc;
|
||
|
|
|
||
|
|
/* output disable */
|
||
|
|
rval = lm3646_mode_ctrl(flash, V4L2_FLASH_LED_MODE_NONE);
|
||
|
|
if (rval < 0)
|
||
|
|
return rval;
|
||
|
|
|
||
|
|
/*
|
||
|
|
* LED1 flash current setting
|
||
|
|
* LED2 flash current = Total(Max) flash current - LED1 flash current
|
||
|
|
*/
|
||
|
|
rval = regmap_update_bits(flash->regmap,
|
||
|
|
REG_LED1_FLASH_BR, 0x7F,
|
||
|
|
LM3646_LED1_FLASH_BRT_uA_TO_REG
|
||
|
|
(flash->pdata->led1_flash_brt));
|
||
|
|
|
||
|
|
if (rval < 0)
|
||
|
|
return rval;
|
||
|
|
|
||
|
|
/*
|
||
|
|
* LED1 torch current setting
|
||
|
|
* LED2 torch current = Total(Max) torch current - LED1 torch current
|
||
|
|
*/
|
||
|
|
rval = regmap_update_bits(flash->regmap,
|
||
|
|
REG_LED1_TORCH_BR, 0x7F,
|
||
|
|
LM3646_LED1_TORCH_BRT_uA_TO_REG
|
||
|
|
(flash->pdata->led1_torch_brt));
|
||
|
|
if (rval < 0)
|
||
|
|
return rval;
|
||
|
|
|
||
|
|
/* Reset flag register */
|
||
|
|
return regmap_read(flash->regmap, REG_FLAG, ®_val);
|
||
|
|
}
|
||
|
|
|
||
|
|
static int lm3646_probe(struct i2c_client *client,
|
||
|
|
const struct i2c_device_id *devid)
|
||
|
|
{
|
||
|
|
struct lm3646_flash *flash;
|
||
|
|
struct lm3646_platform_data *pdata = dev_get_platdata(&client->dev);
|
||
|
|
int rval;
|
||
|
|
|
||
|
|
flash = devm_kzalloc(&client->dev, sizeof(*flash), GFP_KERNEL);
|
||
|
|
if (flash == NULL)
|
||
|
|
return -ENOMEM;
|
||
|
|
|
||
|
|
flash->regmap = devm_regmap_init_i2c(client, &lm3646_regmap);
|
||
|
|
if (IS_ERR(flash->regmap))
|
||
|
|
return PTR_ERR(flash->regmap);
|
||
|
|
|
||
|
|
/* check device tree if there is no platform data */
|
||
|
|
if (pdata == NULL) {
|
||
|
|
pdata = devm_kzalloc(&client->dev,
|
||
|
|
sizeof(struct lm3646_platform_data),
|
||
|
|
GFP_KERNEL);
|
||
|
|
if (pdata == NULL)
|
||
|
|
return -ENOMEM;
|
||
|
|
/* use default data in case of no platform data */
|
||
|
|
pdata->flash_timeout = LM3646_FLASH_TOUT_MAX;
|
||
|
|
pdata->led1_torch_brt = LM3646_LED1_TORCH_BRT_MAX;
|
||
|
|
pdata->led1_flash_brt = LM3646_LED1_FLASH_BRT_MAX;
|
||
|
|
}
|
||
|
|
flash->pdata = pdata;
|
||
|
|
flash->dev = &client->dev;
|
||
|
|
|
||
|
|
rval = lm3646_subdev_init(flash);
|
||
|
|
if (rval < 0)
|
||
|
|
return rval;
|
||
|
|
|
||
|
|
rval = lm3646_init_device(flash);
|
||
|
|
if (rval < 0)
|
||
|
|
return rval;
|
||
|
|
|
||
|
|
i2c_set_clientdata(client, flash);
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int lm3646_remove(struct i2c_client *client)
|
||
|
|
{
|
||
|
|
struct lm3646_flash *flash = i2c_get_clientdata(client);
|
||
|
|
|
||
|
|
v4l2_device_unregister_subdev(&flash->subdev_led);
|
||
|
|
v4l2_ctrl_handler_free(&flash->ctrls_led);
|
||
|
|
media_entity_cleanup(&flash->subdev_led.entity);
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static const struct i2c_device_id lm3646_id_table[] = {
|
||
|
|
{LM3646_NAME, 0},
|
||
|
|
{}
|
||
|
|
};
|
||
|
|
|
||
|
|
MODULE_DEVICE_TABLE(i2c, lm3646_id_table);
|
||
|
|
|
||
|
|
static struct i2c_driver lm3646_i2c_driver = {
|
||
|
|
.driver = {
|
||
|
|
.name = LM3646_NAME,
|
||
|
|
},
|
||
|
|
.probe = lm3646_probe,
|
||
|
|
.remove = lm3646_remove,
|
||
|
|
.id_table = lm3646_id_table,
|
||
|
|
};
|
||
|
|
|
||
|
|
module_i2c_driver(lm3646_i2c_driver);
|
||
|
|
|
||
|
|
MODULE_AUTHOR("Daniel Jeong <gshark.jeong@gmail.com>");
|
||
|
|
MODULE_AUTHOR("Ldd Mlp <ldd-mlp@list.ti.com>");
|
||
|
|
MODULE_DESCRIPTION("Texas Instruments LM3646 Dual Flash LED driver");
|
||
|
|
MODULE_LICENSE("GPL");
|