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/*
* Support for dw9718 vcm driver.
*
* Copyright (c) 2014 Intel Corporation. All Rights Reserved.
*
* 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 Street, Fifth Floor, Boston, MA
* 02110-1301, USA.
*
*/
#include <linux/delay.h>
#include "dw9718.h"
static struct dw9718_device dw9718_dev;
static int dw9718_i2c_rd8(struct i2c_client *client, u8 reg, u8 *val)
{
struct i2c_msg msg[2];
u8 buf[2] = { reg };
msg[0].addr = DW9718_VCM_ADDR;
msg[0].flags = 0;
msg[0].len = 1;
msg[0].buf = buf;
msg[1].addr = DW9718_VCM_ADDR;
msg[1].flags = I2C_M_RD;
msg[1].len = 1;
msg[1].buf = &buf[1];
*val = 0;
if (i2c_transfer(client->adapter, msg, 2) != 2)
return -EIO;
*val = buf[1];
return 0;
}
static int dw9718_i2c_wr8(struct i2c_client *client, u8 reg, u8 val)
{
struct i2c_msg msg;
u8 buf[2] = { reg, val};
msg.addr = DW9718_VCM_ADDR;
msg.flags = 0;
msg.len = sizeof(buf);
msg.buf = buf;
if (i2c_transfer(client->adapter, &msg, 1) != 1)
return -EIO;
return 0;
}
static int dw9718_i2c_wr16(struct i2c_client *client, u8 reg, u16 val)
{
struct i2c_msg msg;
u8 buf[3] = { reg, (u8)(val >> 8), (u8)(val & 0xff)};
msg.addr = DW9718_VCM_ADDR;
msg.flags = 0;
msg.len = sizeof(buf);
msg.buf = buf;
if (i2c_transfer(client->adapter, &msg, 1) != 1)
return -EIO;
return 0;
}
int dw9718_t_focus_abs(struct v4l2_subdev *sd, s32 value)
{
struct i2c_client *client = v4l2_get_subdevdata(sd);
int ret;
value = clamp(value, 0, DW9718_MAX_FOCUS_POS);
ret = dw9718_i2c_wr16(client, DW9718_DATA_M, value);
/*pr_info("%s: value = %d\n", __func__, value);*/
if (ret < 0)
return ret;
getnstimeofday(&dw9718_dev.focus_time);
dw9718_dev.focus = value;
return 0;
}
int dw9718_vcm_power_up(struct v4l2_subdev *sd)
{
struct i2c_client *client = v4l2_get_subdevdata(sd);
int ret;
u8 value;
if (dw9718_dev.power_on)
return 0;
/* Enable power */
ret = dw9718_dev.platform_data->power_ctrl(sd, 1);
if (ret) {
dev_err(&client->dev, "DW9718_PD power_ctrl failed %d\n", ret);
return ret;
}
/* Wait for VBAT to stabilize */
udelay(100);
/* Detect device */
ret = dw9718_i2c_rd8(client, DW9718_SACT, &value);
if (ret < 0) {
dev_err(&client->dev, "read DW9718_SACT failed %d\n", ret);
goto fail_powerdown;
}
/*
* WORKAROUND: for module P8V12F-203 which are used on
* Cherrytrail Refresh Davis Reef AoB, register SACT is not
* returning default value as spec. But VCM works as expected and
* root cause is still under discussion with vendor.
* workaround here to avoid aborting the power up sequence and just
* give a warning about this error.
*/
if (value != DW9718_SACT_DEFAULT_VAL)
dev_warn(&client->dev, "%s error, incorrect ID\n", __func__);
/* Initialize according to recommended settings */
ret = dw9718_i2c_wr8(client, DW9718_CONTROL,
DW9718_CONTROL_SW_LINEAR |
DW9718_CONTROL_S_SAC4 |
DW9718_CONTROL_OCP_DISABLE |
DW9718_CONTROL_UVLO_DISABLE);
if (ret < 0) {
dev_err(&client->dev, "write DW9718_CONTROL failed %d\n", ret);
goto fail_powerdown;
}
ret = dw9718_i2c_wr8(client, DW9718_SACT,
DW9718_SACT_MULT_TWO |
DW9718_SACT_PERIOD_8_8MS);
if (ret < 0) {
dev_err(&client->dev, "write DW9718_SACT failed %d\n", ret);
goto fail_powerdown;
}
ret = dw9718_t_focus_abs(sd, dw9718_dev.focus);
if (ret)
return ret;
dw9718_dev.initialized = true;
dw9718_dev.power_on = 1;
return 0;
fail_powerdown:
dev_err(&client->dev, "%s error, powerup failed\n", __func__);
dw9718_dev.platform_data->power_ctrl(sd, 0);
return ret;
}
int dw9718_vcm_power_down(struct v4l2_subdev *sd)
{
struct i2c_client *client = v4l2_get_subdevdata(sd);
int ret;
if (!dw9718_dev.power_on)
return 0;
ret = dw9718_dev.platform_data->power_ctrl(sd, 0);
if (ret) {
dev_err(&client->dev, "%s power_ctrl failed\n",
__func__);
return ret;
}
dw9718_dev.power_on = 0;
return 0;
}
int dw9718_q_focus_status(struct v4l2_subdev *sd, s32 *value)
{
static const struct timespec move_time = {
.tv_sec = 0,
.tv_nsec = 60000000
};
struct timespec current_time, finish_time, delta_time;
getnstimeofday(¤t_time);
finish_time = timespec_add(dw9718_dev.focus_time, move_time);
delta_time = timespec_sub(current_time, finish_time);
if (delta_time.tv_sec >= 0 && delta_time.tv_nsec >= 0) {
*value = ATOMISP_FOCUS_HP_COMPLETE |
ATOMISP_FOCUS_STATUS_ACCEPTS_NEW_MOVE;
} else {
*value = ATOMISP_FOCUS_STATUS_MOVING |
ATOMISP_FOCUS_HP_IN_PROGRESS;
}
return 0;
}
int dw9718_t_focus_rel(struct v4l2_subdev *sd, s32 value)
{
return dw9718_t_focus_abs(sd, dw9718_dev.focus + value);
}
int dw9718_q_focus_abs(struct v4l2_subdev *sd, s32 *value)
{
*value = dw9718_dev.focus;
return 0;
}
int dw9718_t_vcm_slew(struct v4l2_subdev *sd, s32 value)
{
return 0;
}
int dw9718_t_vcm_timing(struct v4l2_subdev *sd, s32 value)
{
return 0;
}
int dw9718_vcm_init(struct v4l2_subdev *sd)
{
dw9718_dev.platform_data = camera_get_af_platform_data();
dw9718_dev.focus = DW9718_DEFAULT_FOCUS_POSITION;
dw9718_dev.power_on = 0;
return (NULL == dw9718_dev.platform_data) ? -ENODEV : 0;
}
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