diff options
Diffstat (limited to 'drivers/staging/media/atomisp/i2c/imx/dw9718.c')
| -rw-r--r-- | drivers/staging/media/atomisp/i2c/imx/dw9718.c | 238 |
1 files changed, 238 insertions, 0 deletions
diff --git a/drivers/staging/media/atomisp/i2c/imx/dw9718.c b/drivers/staging/media/atomisp/i2c/imx/dw9718.c new file mode 100644 index 0000000..65a1fcf --- /dev/null +++ b/drivers/staging/media/atomisp/i2c/imx/dw9718.c @@ -0,0 +1,238 @@ +/* + * 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_vcm(struct v4l2_subdev *sd, u16 val) +{ + return -EINVAL; +} + +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; +} |
