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alistair23-linux/drivers/media/i2c/lm3560.c
Thomas Gleixner 1802d0beec treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 174 
Based on 1 normalized pattern(s):

  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

extracted by the scancode license scanner the SPDX license identifier

  GPL-2.0-only

has been chosen to replace the boilerplate/reference in 655 file(s).

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Allison Randal <allison@lohutok.net>
Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org>
Reviewed-by: Richard Fontana <rfontana@redhat.com>
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190527070034.575739538@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-05-30 11:26:41 -07:00

484 lines
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// SPDX-License-Identifier: GPL-2.0-only
/*
* drivers/media/i2c/lm3560.c
* General device driver for TI lm3559, lm3560, FLASH LED Driver
*
* Copyright (C) 2013 Texas Instruments
*
* Contact: Daniel Jeong <gshark.jeong@gmail.com>
* Ldd-Mlp <ldd-mlp@list.ti.com>
*/
#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/i2c/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
*
* @dev: pointer to &struct device
* @pdata: platform data
* @regmap: reg. map for i2c
* @lock: muxtex for serial access.
* @led_mode: V4L2 LED mode
* @ctrls_led: V4L2 controls
* @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)
rval = regmap_update_bits(flash->regmap,
REG_ENABLE, 0x08, 0x08);
else
rval = regmap_update_bits(flash->regmap,
REG_ENABLE, 0x08, 0x00);
} else {
if (on)
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);
int rval = -EINVAL;
mutex_lock(&flash->lock);
if (ctrl->id == V4L2_CID_FLASH_FAULT) {
s32 fault = 0;
unsigned int reg_val;
rval = regmap_read(flash->regmap, REG_FLAG, &reg_val);
if (rval < 0)
goto out;
if (reg_val & FAULT_SHORT_CIRCUIT)
fault |= V4L2_FLASH_FAULT_SHORT_CIRCUIT;
if (reg_val & FAULT_OVERTEMP)
fault |= V4L2_FLASH_FAULT_OVER_TEMPERATURE;
if (reg_val & FAULT_TIMEOUT)
fault |= V4L2_FLASH_FAULT_TIMEOUT;
ctrl->cur.val = fault;
}
out:
mutex_unlock(&flash->lock);
return rval;
}
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) {
rval = -EBUSY;
goto err_out;
}
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) {
rval = -EBUSY;
goto err_out;
}
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;
}
err_out:
mutex_unlock(&flash->lock);
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;
strscpy(flash->subdev_led[led_no].name, led_name,
sizeof(flash->subdev_led[led_no].name));
rval = lm3560_init_controls(flash, led_no);
if (rval)
goto err_out;
rval = media_entity_pads_init(&flash->subdev_led[led_no].entity, 0, NULL);
if (rval < 0)
goto err_out;
flash->subdev_led[led_no].entity.function = MEDIA_ENT_F_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 = devm_kzalloc(&client->dev, sizeof(*pdata), 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;
i2c_set_clientdata(client, flash);
return 0;
}
static int lm3560_remove(struct i2c_client *client)
{
struct lm3560_flash *flash = i2c_get_clientdata(client);
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[] = {
{LM3559_NAME, 0},
{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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