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|
/*
* drivers/media/i2c/as3645a.c - AS3645A and LM3555 flash controllers driver
*
* Copyright (C) 2008-2011 Nokia Corporation
* Copyright (c) 2011, Intel Corporation.
*
* Contact: Laurent Pinchart <laurent.pinchart@ideasonboard.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:
* - Check hardware FSTROBE control when sensor driver add support for this
*
*/
#include <linux/delay.h>
#include <linux/i2c.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/slab.h>
#include <media/as3645a.h>
#include <media/v4l2-ctrls.h>
#include <media/v4l2-device.h>
#define AS_TIMER_MS_TO_CODE(t) (((t) - 100) / 50)
#define AS_TIMER_CODE_TO_MS(c) (50 * (c) + 100)
/* Register definitions */
/* Read-only Design info register: Reset state: xxxx 0001 */
#define AS_DESIGN_INFO_REG 0x00
#define AS_DESIGN_INFO_FACTORY(x) (((x) >> 4))
#define AS_DESIGN_INFO_MODEL(x) ((x) & 0x0f)
/* Read-only Version control register: Reset state: 0000 0000
* for first engineering samples
*/
#define AS_VERSION_CONTROL_REG 0x01
#define AS_VERSION_CONTROL_RFU(x) (((x) >> 4))
#define AS_VERSION_CONTROL_VERSION(x) ((x) & 0x0f)
/* Read / Write (Indicator and timer register): Reset state: 0000 1111 */
#define AS_INDICATOR_AND_TIMER_REG 0x02
#define AS_INDICATOR_AND_TIMER_TIMEOUT_SHIFT 0
#define AS_INDICATOR_AND_TIMER_VREF_SHIFT 4
#define AS_INDICATOR_AND_TIMER_INDICATOR_SHIFT 6
/* Read / Write (Current set register): Reset state: 0110 1001 */
#define AS_CURRENT_SET_REG 0x03
#define AS_CURRENT_ASSIST_LIGHT_SHIFT 0
#define AS_CURRENT_LED_DET_ON (1 << 3)
#define AS_CURRENT_FLASH_CURRENT_SHIFT 4
/* Read / Write (Control register): Reset state: 1011 0100 */
#define AS_CONTROL_REG 0x04
#define AS_CONTROL_MODE_SETTING_SHIFT 0
#define AS_CONTROL_STROBE_ON (1 << 2)
#define AS_CONTROL_OUT_ON (1 << 3)
#define AS_CONTROL_EXT_TORCH_ON (1 << 4)
#define AS_CONTROL_STROBE_TYPE_EDGE (0 << 5)
#define AS_CONTROL_STROBE_TYPE_LEVEL (1 << 5)
#define AS_CONTROL_COIL_PEAK_SHIFT 6
/* Read only (D3 is read / write) (Fault and info): Reset state: 0000 x000 */
#define AS_FAULT_INFO_REG 0x05
#define AS_FAULT_INFO_INDUCTOR_PEAK_LIMIT (1 << 1)
#define AS_FAULT_INFO_INDICATOR_LED (1 << 2)
#define AS_FAULT_INFO_LED_AMOUNT (1 << 3)
#define AS_FAULT_INFO_TIMEOUT (1 << 4)
#define AS_FAULT_INFO_OVER_TEMPERATURE (1 << 5)
#define AS_FAULT_INFO_SHORT_CIRCUIT (1 << 6)
#define AS_FAULT_INFO_OVER_VOLTAGE (1 << 7)
/* Boost register */
#define AS_BOOST_REG 0x0d
#define AS_BOOST_CURRENT_DISABLE (0 << 0)
#define AS_BOOST_CURRENT_ENABLE (1 << 0)
/* Password register is used to unlock boost register writing */
#define AS_PASSWORD_REG 0x0f
#define AS_PASSWORD_UNLOCK_VALUE 0x55
enum as_mode {
AS_MODE_EXT_TORCH = 0 << AS_CONTROL_MODE_SETTING_SHIFT,
AS_MODE_INDICATOR = 1 << AS_CONTROL_MODE_SETTING_SHIFT,
AS_MODE_ASSIST = 2 << AS_CONTROL_MODE_SETTING_SHIFT,
AS_MODE_FLASH = 3 << AS_CONTROL_MODE_SETTING_SHIFT,
};
/*
* struct as3645a
*
* @subdev: V4L2 subdev
* @pdata: Flash platform data
* @power_lock: Protects power_count
* @power_count: Power reference count
* @led_mode: V4L2 flash LED mode
* @timeout: Flash timeout in microseconds
* @flash_current: Flash current (0=200mA ... 15=500mA). Maximum
* values are 400mA for two LEDs and 500mA for one LED.
* @assist_current: Torch/Assist light current (0=20mA, 1=40mA ... 7=160mA)
* @indicator_current: Indicator LED current (0=0mA, 1=2.5mA ... 4=10mA)
* @strobe_source: Flash strobe source (software or external)
*/
struct as3645a {
struct v4l2_subdev subdev;
const struct as3645a_platform_data *pdata;
struct mutex power_lock;
int power_count;
/* Controls */
struct v4l2_ctrl_handler ctrls;
enum v4l2_flash_led_mode led_mode;
unsigned int timeout;
u8 flash_current;
u8 assist_current;
u8 indicator_current;
enum v4l2_flash_strobe_source strobe_source;
};
#define to_as3645a(sd) container_of(sd, struct as3645a, subdev)
/* Return negative errno else zero on success */
static int as3645a_write(struct as3645a *flash, u8 addr, u8 val)
{
struct i2c_client *client = v4l2_get_subdevdata(&flash->subdev);
int rval;
rval = i2c_smbus_write_byte_data(client, addr, val);
dev_dbg(&client->dev, "Write Addr:%02X Val:%02X %s\n", addr, val,
rval < 0 ? "fail" : "ok");
return rval;
}
/* Return negative errno else a data byte received from the device. */
static int as3645a_read(struct as3645a *flash, u8 addr)
{
struct i2c_client *client = v4l2_get_subdevdata(&flash->subdev);
int rval;
rval = i2c_smbus_read_byte_data(client, addr);
dev_dbg(&client->dev, "Read Addr:%02X Val:%02X %s\n", addr, rval,
rval < 0 ? "fail" : "ok");
return rval;
}
/* -----------------------------------------------------------------------------
* Hardware configuration and trigger
*/
/*
* as3645a_set_config - Set flash configuration registers
* @flash: The flash
*
* Configure the hardware with flash, assist and indicator currents, as well as
* flash timeout.
*
* Return 0 on success, or a negative error code if an I2C communication error
* occurred.
*/
static int as3645a_set_config(struct as3645a *flash)
{
int ret;
u8 val;
val = (flash->flash_current << AS_CURRENT_FLASH_CURRENT_SHIFT)
| (flash->assist_current << AS_CURRENT_ASSIST_LIGHT_SHIFT)
| AS_CURRENT_LED_DET_ON;
ret = as3645a_write(flash, AS_CURRENT_SET_REG, val);
if (ret < 0)
return ret;
val = AS_TIMER_MS_TO_CODE(flash->timeout / 1000)
<< AS_INDICATOR_AND_TIMER_TIMEOUT_SHIFT;
val |= (flash->pdata->vref << AS_INDICATOR_AND_TIMER_VREF_SHIFT)
| ((flash->indicator_current ? flash->indicator_current - 1 : 0)
<< AS_INDICATOR_AND_TIMER_INDICATOR_SHIFT);
return as3645a_write(flash, AS_INDICATOR_AND_TIMER_REG, val);
}
/*
* as3645a_set_control - Set flash control register
* @flash: The flash
* @mode: Desired output mode
* @on: Desired output state
*
* Configure the hardware with output mode and state.
*
* Return 0 on success, or a negative error code if an I2C communication error
* occurred.
*/
static int
as3645a_set_control(struct as3645a *flash, enum as_mode mode, bool on)
{
u8 reg;
/* Configure output parameters and operation mode. */
reg = (flash->pdata->peak << AS_CONTROL_COIL_PEAK_SHIFT)
| (on ? AS_CONTROL_OUT_ON : 0)
| mode;
if (flash->led_mode == V4L2_FLASH_LED_MODE_FLASH &&
flash->strobe_source == V4L2_FLASH_STROBE_SOURCE_EXTERNAL) {
reg |= AS_CONTROL_STROBE_TYPE_LEVEL
| AS_CONTROL_STROBE_ON;
}
return as3645a_write(flash, AS_CONTROL_REG, reg);
}
/*
* as3645a_set_output - Configure output and operation mode
* @flash: Flash controller
* @strobe: Strobe the flash (only valid in flash mode)
*
* Turn the LEDs output on/off and set the operation mode based on the current
* parameters.
*
* The AS3645A can't control the indicator LED independently of the flash/torch
* LED. If the flash controller is in V4L2_FLASH_LED_MODE_NONE mode, set the
* chip to indicator mode. Otherwise set it to assist light (torch) or flash
* mode.
*
* In indicator and assist modes, turn the output on/off based on the indicator
* and torch currents. In software strobe flash mode, turn the output on/off
* based on the strobe parameter.
*/
static int as3645a_set_output(struct as3645a *flash, bool strobe)
{
enum as_mode mode;
bool on;
switch (flash->led_mode) {
case V4L2_FLASH_LED_MODE_NONE:
on
|