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#include <linux/bitops.h>
#include <linux/device.h>
#include <linux/delay.h>
#include <linux/errno.h>
#include <linux/fs.h>
#include <linux/gpio.h>
#include <linux/init.h>
#include <linux/i2c.h>
#include <linux/io.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/kmod.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/string.h>
#include <linux/slab.h>
#include <linux/types.h>
#include <media/v4l2-device.h>
#include <asm/intel-mid.h>
#include "drv201.h"
static struct drv201_device drv201_dev;
static int drv201_i2c_rd8(struct i2c_client *client, u8 reg, u8 *val)
{
struct i2c_msg msg[2];
u8 buf[2];
buf[0] = reg;
buf[1] = 0;
msg[0].addr = DRV201_VCM_ADDR;
msg[0].flags = 0;
msg[0].len = 1;
msg[0].buf = &buf[0];
msg[1].addr = DRV201_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 drv201_i2c_wr8(struct i2c_client *client, u8 reg, u8 val)
{
struct i2c_msg msg;
u8 buf[2];
buf[0] = reg;
buf[1] = val;
msg.addr = DRV201_VCM_ADDR;
msg.flags = 0;
msg.len = 2;
msg.buf = &buf[0];
if (i2c_transfer(client->adapter, &msg, 1) != 1)
return -EIO;
return 0;
}
static int drv201_i2c_wr16(struct i2c_client *client, u8 reg, u16 val)
{
struct i2c_msg msg;
u8 buf[3];
buf[0] = reg;
buf[1] = (u8)(val >> 8);
buf[2] = (u8)(val & 0xff);
msg.addr = DRV201_VCM_ADDR;
msg.flags = 0;
msg.len = 3;
msg.buf = &buf[0];
if (i2c_transfer(client->adapter, &msg, 1) != 1)
return -EIO;
return 0;
}
int drv201_vcm_power_up(struct v4l2_subdev *sd)
{
struct i2c_client *client = v4l2_get_subdevdata(sd);
int ret;
u8 value;
/* Enable power */
ret = drv201_dev.platform_data->power_ctrl(sd, 1);
if (ret)
return ret;
/* Wait for VBAT to stabilize */
udelay(1);
/*
* Jiggle SCL pin to wake up device.
* Drv201 expect SCL from low to high to wake device up.
* So the 1st access to i2c would fail.
* Using following function to wake device up.
*/
drv201_i2c_wr8(client, DRV201_CONTROL, DRV201_RESET);
/* Need 100us to transit from SHUTDOWN to STANDBY*/
usleep_range(WAKEUP_DELAY_US, WAKEUP_DELAY_US * 10);
/* Reset device */
ret = drv201_i2c_wr8(client, DRV201_CONTROL, DRV201_RESET);
if (ret < 0)
goto fail_powerdown;
/* Detect device */
ret = drv201_i2c_rd8(client, DRV201_CONTROL, &value);
if (ret < 0)
goto fail_powerdown;
if (value != DEFAULT_CONTROL_VAL) {
ret = -ENXIO;
goto fail_powerdown;
}
drv201_dev.focus = DRV201_MAX_FOCUS_POS;
drv201_dev.initialized = true;
return 0;
fail_powerdown:
drv201_dev.platform_data->power_ctrl(sd, 0);
return ret;
}
int drv201_vcm_power_down(struct v4l2_subdev *sd)
{
return drv201_dev.platform_data->power_ctrl(sd, 0);
}
static int drv201_t_focus_vcm(struct v4l2_subdev *sd, u16 val)
{
struct i2c_client *client = v4l2_get_subdevdata(sd);
u16 data = val & VCM_CODE_MASK;
if (!drv201_dev.initialized)
return -ENODEV;
return drv201_i2c_wr16(client, DRV201_VCM_CURRENT, data);
}
int drv201_t_focus_abs(struct v4l2_subdev *sd, s32 value)
{
int ret;
value = clamp(value, 0, DRV201_MAX_FOCUS_POS);
ret = drv201_t_focus_vcm(sd, value);
if (ret == 0) {
drv201_dev.number_of_steps = value - drv201_dev.focus;
drv201_dev.focus = value;
getnstimeofday(&(drv201_dev.timestamp_t_focus_abs));
}
return ret;
}
int drv201_t_focus_rel(struct v4l2_subdev *sd, s32 value)
{
return drv201_t_focus_abs(sd, drv201_dev.focus + value);
}
int drv201_q_focus_status(struct v4l2_subdev *sd, s32 *value)
{
u32 status = 0;
struct timespec temptime;
const struct timespec timedelay = {
0,
min_t(u32, abs(drv201_dev.number_of_steps)*DELAY_PER_STEP_NS,
DELAY_MAX_PER_STEP_NS),
};
ktime_get_ts(&temptime);
temptime = timespec_sub(temptime, (drv201_dev.timestamp_t_focus_abs));
if (timespec_compare(&temptime, &timedelay) <= 0) {
status |= ATOMISP_FOCUS_STATUS_MOVING;
status |= ATOMISP_FOCUS_HP_IN_PROGRESS;
} else {
status |= ATOMISP_FOCUS_STATUS_ACCEPTS_NEW_MOVE;
status |= ATOMISP_FOCUS_HP_COMPLETE;
}
*value = status;
return 0;
}
int drv201_q_focus_abs(struct v4l2_subdev *sd, s32 *value)
{
s32 val;
drv201_q_focus_status(sd, &val);
if (val & ATOMISP_FOCUS_STATUS_MOVING)
*value = drv201_dev.focus - drv201_dev.number_of_steps;
else
*value = drv201_dev.focus;
return 0;
}
int drv201_t_vcm_slew(struct v4l2_subdev *sd, s32 value)
{
return 0;
}
int drv201_t_vcm_timing(struct v4l2_subdev *sd, s32 value)
{
return 0;
}
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