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linux/drivers/media/i2c/lm3560.c
Daniel Jeong 7f6b11a18c [media] media: i2c: add driver for dual LED Flash, lm3560 
Adds the driver for the LM3560, dual LED Flash The LM3560 has two 1A
constant current driver for high current white LEDs.

It is controlled via an I2C compatible interface(up to 400kHz).

Each flash brightness, torch  brightness and enable/disable can be
controlled independantly, but flash timeout and operation mode are shared.

Signed-off-by: Daniel Jeong <gshark.jeong@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>
2013-10-31 06:36:39 -02:00

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/*
* drivers/media/i2c/lm3560.c
* General device driver for TI lm3560, FLASH LED Driver
*
* Copyright (C) 2013 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.
*
* 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
*
*/
#include <linux/delay.h>
#include <linux/module.h>
#include <linux/i2c.h>
#include <linux/slab.h>
#include <linux/mutex.h>
#include <linux/regmap.h>
#include <linux/videodev2.h>
#include <media/lm3560.h>
#include <media/v4l2-ctrls.h>
#include <media/v4l2-device.h>
/* registers definitions */
#define REG_ENABLE 0x10
#define REG_TORCH_BR 0xa0
#define REG_FLASH_BR 0xb0
#define REG_FLASH_TOUT 0xc0
#define REG_FLAG 0xd0
#define REG_CONFIG1 0xe0
/* Fault Mask */
#define FAULT_TIMEOUT (1<<0)
#define FAULT_OVERTEMP (1<<1)
#define FAULT_SHORT_CIRCUIT (1<<2)
enum led_enable {
MODE_SHDN = 0x0,
MODE_TORCH = 0x2,
MODE_FLASH = 0x3,
};
/* struct lm3560_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
*/
struct lm3560_flash {
struct device *dev;
struct lm3560_platform_data *pdata;
struct regmap *regmap;
struct mutex lock;
enum v4l2_flash_led_mode led_mode;
struct v4l2_ctrl_handler ctrls_led[LM3560_LED_MAX];
struct v4l2_subdev subdev_led[LM3560_LED_MAX];
};
#define to_lm3560_flash(_ctrl, _no) \
container_of(_ctrl->handler, struct lm3560_flash, ctrls_led[_no])
/* enable mode control */
static int lm3560_mode_ctrl(struct lm3560_flash *flash)
{
int rval = -EINVAL;
switch (flash->led_mode) {
case V4L2_FLASH_LED_MODE_NONE:
rval = regmap_update_bits(flash->regmap,
REG_ENABLE, 0x03, MODE_SHDN);
break;
case V4L2_FLASH_LED_MODE_TORCH:
rval = regmap_update_bits(flash->regmap,
REG_ENABLE, 0x03, MODE_TORCH);
break;
case V4L2_FLASH_LED_MODE_FLASH:
rval = regmap_update_bits(flash->regmap,
REG_ENABLE, 0x03, MODE_FLASH);
break;
}
return rval;
}
/* led1/2 enable/disable */
static int lm3560_enable_ctrl(struct lm3560_flash *flash,
enum lm3560_led_id led_no, bool on)
{
int rval;
if (led_no == LM3560_LED0) {
if (on == true)
rval = regmap_update_bits(flash->regmap,
REG_ENABLE, 0x08, 0x08);
else
rval = regmap_update_bits(flash->regmap,
REG_ENABLE, 0x08, 0x00);
} else {
if (on == true)
rval = regmap_update_bits(flash->regmap,
REG_ENABLE, 0x10, 0x10);
else
rval = regmap_update_bits(flash->regmap,
REG_ENABLE, 0x10, 0x00);
}
return rval;
}
/* torch1/2 brightness control */
static int lm3560_torch_brt_ctrl(struct lm3560_flash *flash,
enum lm3560_led_id led_no, unsigned int brt)
{
int rval;
u8 br_bits;
if (brt < LM3560_TORCH_BRT_MIN)
return lm3560_enable_ctrl(flash, led_no, false);
else
rval = lm3560_enable_ctrl(flash, led_no, true);
br_bits = LM3560_TORCH_BRT_uA_TO_REG(brt);
if (led_no == LM3560_LED0)
rval = regmap_update_bits(flash->regmap,
REG_TORCH_BR, 0x07, br_bits);
else
rval = regmap_update_bits(flash->regmap,
REG_TORCH_BR, 0x38, br_bits << 3);
return rval;
}
/* flash1/2 brightness control */
static int lm3560_flash_brt_ctrl(struct lm3560_flash *flash,
enum lm3560_led_id led_no, unsigned int brt)
{
int rval;
u8 br_bits;
if (brt < LM3560_FLASH_BRT_MIN)
return lm3560_enable_ctrl(flash, led_no, false);
else
rval = lm3560_enable_ctrl(flash, led_no, true);
br_bits = LM3560_FLASH_BRT_uA_TO_REG(brt);
if (led_no == LM3560_LED0)
rval = regmap_update_bits(flash->regmap,
REG_FLASH_BR, 0x0f, br_bits);
else
rval = regmap_update_bits(flash->regmap,
REG_FLASH_BR, 0xf0, br_bits << 4);
return rval;
}
/* V4L2 controls */
static int lm3560_get_ctrl(struct v4l2_ctrl *ctrl, enum lm3560_led_id led_no)
{
struct lm3560_flash *flash = to_lm3560_flash(ctrl, led_no);
mutex_lock(&flash->lock);
if (ctrl->id == V4L2_CID_FLASH_FAULT) {
int rval;
s32 fault = 0;
unsigned int reg_val;
rval = regmap_read(flash->regmap, REG_FLAG, &reg_val);
if (rval < 0)
return rval;
if (rval & FAULT_SHORT_CIRCUIT)
fault |= V4L2_FLASH_FAULT_SHORT_CIRCUIT;
if (rval & FAULT_OVERTEMP)
fault |= V4L2_FLASH_FAULT_OVER_TEMPERATURE;
if (rval & FAULT_TIMEOUT)
fault |= V4L2_FLASH_FAULT_TIMEOUT;
ctrl->cur.val = fault;
return 0;
}
mutex_unlock(&flash->lock);
return -EINVAL;
}
static int lm3560_set_ctrl(struct v4l2_ctrl *ctrl, enum lm3560_led_id led_no)
{
struct lm3560_flash *flash = to_lm3560_flash(ctrl, led_no);
u8 tout_bits;
int rval = -EINVAL;
mutex_lock(&flash->lock);
switch (ctrl->id) {
case V4L2_CID_FLASH_LED_MODE:
flash->led_mode = ctrl->val;
if (flash->led_mode != V4L2_FLASH_LED_MODE_FLASH)
rval = lm3560_mode_ctrl(flash);
break;
case V4L2_CID_FLASH_STROBE_SOURCE:
rval = regmap_update_bits(flash->regmap,
REG_CONFIG1, 0x04, (ctrl->val) << 2);
if (rval < 0)
goto err_out;
break;
case V4L2_CID_FLASH_STROBE:
if (flash->led_mode != V4L2_FLASH_LED_MODE_FLASH)
return -EBUSY;
flash->led_mode = V4L2_FLASH_LED_MODE_FLASH;
rval = lm3560_mode_ctrl(flash);
break;
case V4L2_CID_FLASH_STROBE_STOP:
if (flash->led_mode != V4L2_FLASH_LED_MODE_FLASH)
return -EBUSY;
flash->led_mode = V4L2_FLASH_LED_MODE_NONE;
rval = lm3560_mode_ctrl(flash);
break;
case V4L2_CID_FLASH_TIMEOUT:
tout_bits = LM3560_FLASH_TOUT_ms_TO_REG(ctrl->val);
rval = regmap_update_bits(flash->regmap,
REG_FLASH_TOUT, 0x1f, tout_bits);
break;
case V4L2_CID_FLASH_INTENSITY:
rval = lm3560_flash_brt_ctrl(flash, led_no, ctrl->val);
break;
case V4L2_CID_FLASH_TORCH_INTENSITY:
rval = lm3560_torch_brt_ctrl(flash, led_no, ctrl->val);
break;
}
mutex_unlock(&flash->lock);
err_out:
return rval;
}
static int lm3560_led1_get_ctrl(struct v4l2_ctrl *ctrl)
{
return lm3560_get_ctrl(ctrl, LM3560_LED1);
}
static int lm3560_led1_set_ctrl(struct v4l2_ctrl *ctrl)
{
return lm3560_set_ctrl(ctrl, LM3560_LED1);
}
static int lm3560_led0_get_ctrl(struct v4l2_ctrl *ctrl)
{
return lm3560_get_ctrl(ctrl, LM3560_LED0);
}
static int lm3560_led0_set_ctrl(struct v4l2_ctrl *ctrl)
{
return lm3560_set_ctrl(ctrl, LM3560_LED0);
}
static const struct v4l2_ctrl_ops lm3560_led_ctrl_ops[LM3560_LED_MAX] = {
[LM3560_LED0] = {
.g_volatile_ctrl = lm3560_led0_get_ctrl,
.s_ctrl = lm3560_led0_set_ctrl,
},
[LM3560_LED1] = {
.g_volatile_ctrl = lm3560_led1_get_ctrl,
.s_ctrl = lm3560_led1_set_ctrl,
}
};
static int lm3560_init_controls(struct lm3560_flash *flash,
enum lm3560_led_id led_no)
{
struct v4l2_ctrl *fault;
u32 max_flash_brt = flash->pdata->max_flash_brt[led_no];
u32 max_torch_brt = flash->pdata->max_torch_brt[led_no];
struct v4l2_ctrl_handler *hdl = &flash->ctrls_led[led_no];
const struct v4l2_ctrl_ops *ops = &lm3560_led_ctrl_ops[led_no];
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->led_mode = 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,
LM3560_FLASH_TOUT_MIN,
flash->pdata->max_flash_timeout,
LM3560_FLASH_TOUT_STEP,
flash->pdata->max_flash_timeout);
/* flash brt */
v4l2_ctrl_new_std(hdl, ops, V4L2_CID_FLASH_INTENSITY,
LM3560_FLASH_BRT_MIN, max_flash_brt,
LM3560_FLASH_BRT_STEP, max_flash_brt);
/* torch brt */
v4l2_ctrl_new_std(hdl, ops, V4L2_CID_FLASH_TORCH_INTENSITY,
LM3560_TORCH_BRT_MIN, max_torch_brt,
LM3560_TORCH_BRT_STEP, max_torch_brt);
/* 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[led_no].ctrl_handler = hdl;
return 0;
}
/* initialize device */
static const struct v4l2_subdev_ops lm3560_ops = {
.core = NULL,
};
static const struct regmap_config lm3560_regmap = {
.reg_bits = 8,
.val_bits = 8,
.max_register = 0xFF,
};
static int lm3560_subdev_init(struct lm3560_flash *flash,
enum lm3560_led_id led_no, char *led_name)
{
struct i2c_client *client = to_i2c_client(flash->dev);
int rval;
v4l2_i2c_subdev_init(&flash->subdev_led[led_no], client, &lm3560_ops);
flash->subdev_led[led_no].flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
strcpy(flash->subdev_led[led_no].name, led_name);
rval = lm3560_init_controls(flash, led_no);
if (rval)
goto err_out;
rval = media_entity_init(&flash->subdev_led[led_no].entity, 0, NULL, 0);
if (rval < 0)
goto err_out;
flash->subdev_led[led_no].entity.type = MEDIA_ENT_T_V4L2_SUBDEV_FLASH;
return rval;
err_out:
v4l2_ctrl_handler_free(&flash->ctrls_led[led_no]);
return rval;
}
static int lm3560_init_device(struct lm3560_flash *flash)
{
int rval;
unsigned int reg_val;
/* set peak current */
rval = regmap_update_bits(flash->regmap,
REG_FLASH_TOUT, 0x60, flash->pdata->peak);
if (rval < 0)
return rval;
/* output disable */
flash->led_mode = V4L2_FLASH_LED_MODE_NONE;
rval = lm3560_mode_ctrl(flash);
if (rval < 0)
return rval;
/* Reset faults */
rval = regmap_read(flash->regmap, REG_FLAG, &reg_val);
return rval;
}
static int lm3560_probe(struct i2c_client *client,
const struct i2c_device_id *devid)
{
struct lm3560_flash *flash;
struct lm3560_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, &lm3560_regmap);
if (IS_ERR(flash->regmap)) {
rval = PTR_ERR(flash->regmap);
return rval;
}
/* if there is no platform data, use chip default value */
if (pdata == NULL) {
pdata =
kzalloc(sizeof(struct lm3560_platform_data), GFP_KERNEL);
if (pdata == NULL)
return -ENODEV;
pdata->peak = LM3560_PEAK_3600mA;
pdata->max_flash_timeout = LM3560_FLASH_TOUT_MAX;
/* led 1 */
pdata->max_flash_brt[LM3560_LED0] = LM3560_FLASH_BRT_MAX;
pdata->max_torch_brt[LM3560_LED0] = LM3560_TORCH_BRT_MAX;
/* led 2 */
pdata->max_flash_brt[LM3560_LED1] = LM3560_FLASH_BRT_MAX;
pdata->max_torch_brt[LM3560_LED1] = LM3560_TORCH_BRT_MAX;
}
flash->pdata = pdata;
flash->dev = &client->dev;
mutex_init(&flash->lock);
rval = lm3560_subdev_init(flash, LM3560_LED0, "lm3560-led0");
if (rval < 0)
return rval;
rval = lm3560_subdev_init(flash, LM3560_LED1, "lm3560-led1");
if (rval < 0)
return rval;
rval = lm3560_init_device(flash);
if (rval < 0)
return rval;
return 0;
}
static int lm3560_remove(struct i2c_client *client)
{
struct v4l2_subdev *subdev = i2c_get_clientdata(client);
struct lm3560_flash *flash = container_of(subdev, struct lm3560_flash,
subdev_led[LM3560_LED_MAX]);
unsigned int i;
for (i = LM3560_LED0; i < LM3560_LED_MAX; i++) {
v4l2_device_unregister_subdev(&flash->subdev_led[i]);
v4l2_ctrl_handler_free(&flash->ctrls_led[i]);
media_entity_cleanup(&flash->subdev_led[i].entity);
}
return 0;
}
static const struct i2c_device_id lm3560_id_table[] = {
{LM3560_NAME, 0},
{}
};
MODULE_DEVICE_TABLE(i2c, lm3560_id_table);
static struct i2c_driver lm3560_i2c_driver = {
.driver = {
.name = LM3560_NAME,
.pm = NULL,
},
.probe = lm3560_probe,
.remove = lm3560_remove,
.id_table = lm3560_id_table,
};
module_i2c_driver(lm3560_i2c_driver);
MODULE_AUTHOR("Daniel Jeong <gshark.jeong@gmail.com>");
MODULE_AUTHOR("Ldd Mlp <ldd-mlp@list.ti.com>");
MODULE_DESCRIPTION("Texas Instruments LM3560 LED flash driver");
MODULE_LICENSE("GPL");
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