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Release 4.13 drivers/media/i2c/dw9714.c

/*
 * Copyright (c) 2015--2017 Intel Corporation.
 *
 * 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.
 */

#include <linux/acpi.h>
#include <linux/delay.h>
#include <linux/i2c.h>
#include <linux/module.h>
#include <linux/pm_runtime.h>
#include <media/v4l2-ctrls.h>
#include <media/v4l2-device.h>


#define DW9714_NAME		"dw9714"

#define DW9714_MAX_FOCUS_POS	1023
/*
 * This acts as the minimum granularity of lens movement.
 * Keep this value power of 2, so the control steps can be
 * uniformly adjusted for gradual lens movement, with desired
 * number of control steps.
 */

#define DW9714_CTRL_STEPS	16

#define DW9714_CTRL_DELAY_US	1000
/*
 * S[3:2] = 0x00, codes per step for "Linear Slope Control"
 * S[1:0] = 0x00, step period
 */

#define DW9714_DEFAULT_S 0x0

#define DW9714_VAL(data, s) ((data) << 4 | (s))

/* dw9714 device structure */

struct dw9714_device {
	
struct i2c_client *client;
	
struct v4l2_ctrl_handler ctrls_vcm;
	
struct v4l2_subdev sd;
	
u16 current_val;
};


static inline struct dw9714_device *to_dw9714_vcm(struct v4l2_ctrl *ctrl) { return container_of(ctrl->handler, struct dw9714_device, ctrls_vcm); }

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static inline struct dw9714_device *sd_to_dw9714_vcm(struct v4l2_subdev *subdev) { return container_of(subdev, struct dw9714_device, sd); }

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static int dw9714_i2c_write(struct i2c_client *client, u16 data) { int ret; u16 val = cpu_to_be16(data); ret = i2c_master_send(client, (const char *)&val, sizeof(val)); if (ret != sizeof(val)) { dev_err(&client->dev, "I2C write fail\n"); return -EIO; } return 0; }

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static int dw9714_t_focus_vcm(struct dw9714_device *dw9714_dev, u16 val) { struct i2c_client *client = dw9714_dev->client; dw9714_dev->current_val = val; return dw9714_i2c_write(client, DW9714_VAL(val, DW9714_DEFAULT_S)); }

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static int dw9714_set_ctrl(struct v4l2_ctrl *ctrl) { struct dw9714_device *dev_vcm = to_dw9714_vcm(ctrl); if (ctrl->id == V4L2_CID_FOCUS_ABSOLUTE) return dw9714_t_focus_vcm(dev_vcm, ctrl->val); return -EINVAL; }

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static const struct v4l2_ctrl_ops dw9714_vcm_ctrl_ops = { .s_ctrl = dw9714_set_ctrl, };
static int dw9714_open(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh) { struct dw9714_device *dw9714_dev = sd_to_dw9714_vcm(sd); struct device *dev = &dw9714_dev->client->dev; int rval; rval = pm_runtime_get_sync(dev); if (rval < 0) { pm_runtime_put_noidle(dev); return rval; } return 0; }

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static int dw9714_close(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh) { struct dw9714_device *dw9714_dev = sd_to_dw9714_vcm(sd); struct device *dev = &dw9714_dev->client->dev; pm_runtime_put(dev); return 0; }

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static const struct v4l2_subdev_internal_ops dw9714_int_ops = { .open = dw9714_open, .close = dw9714_close, }; static const struct v4l2_subdev_ops dw9714_ops = { };
static void dw9714_subdev_cleanup(struct dw9714_device *dw9714_dev) { v4l2_async_unregister_subdev(&dw9714_dev->sd); v4l2_ctrl_handler_free(&dw9714_dev->ctrls_vcm); media_entity_cleanup(&dw9714_dev->sd.entity); }

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static int dw9714_init_controls(struct dw9714_device *dev_vcm) { struct v4l2_ctrl_handler *hdl = &dev_vcm->ctrls_vcm; const struct v4l2_ctrl_ops *ops = &dw9714_vcm_ctrl_ops; struct i2c_client *client = dev_vcm->client; v4l2_ctrl_handler_init(hdl, 1); v4l2_ctrl_new_std(hdl, ops, V4L2_CID_FOCUS_ABSOLUTE, 0, DW9714_MAX_FOCUS_POS, DW9714_CTRL_STEPS, 0); if (hdl->error) dev_err(&client->dev, "%s fail error: 0x%x\n", __func__, hdl->error); dev_vcm->sd.ctrl_handler = hdl; return hdl->error; }

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static int dw9714_probe(struct i2c_client *client, const struct i2c_device_id *devid) { struct dw9714_device *dw9714_dev; int rval; dw9714_dev = devm_kzalloc(&client->dev, sizeof(*dw9714_dev), GFP_KERNEL); if (dw9714_dev == NULL) return -ENOMEM; dw9714_dev->client = client; v4l2_i2c_subdev_init(&dw9714_dev->sd, client, &dw9714_ops); dw9714_dev->sd.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE; dw9714_dev->sd.internal_ops = &dw9714_int_ops; rval = dw9714_init_controls(dw9714_dev); if (rval) goto err_cleanup; rval = media_entity_pads_init(&dw9714_dev->sd.entity, 0, NULL); if (rval < 0) goto err_cleanup; dw9714_dev->sd.entity.function = MEDIA_ENT_F_LENS; rval = v4l2_async_register_subdev(&dw9714_dev->sd); if (rval < 0) goto err_cleanup; pm_runtime_set_active(&client->dev); pm_runtime_enable(&client->dev); return 0; err_cleanup: dw9714_subdev_cleanup(dw9714_dev); dev_err(&client->dev, "Probe failed: %d\n", rval); return rval; }

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static int dw9714_remove(struct i2c_client *client) { struct v4l2_subdev *sd = i2c_get_clientdata(client); struct dw9714_device *dw9714_dev = sd_to_dw9714_vcm(sd); pm_runtime_disable(&client->dev); dw9714_subdev_cleanup(dw9714_dev); return 0; }

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/* * This function sets the vcm position, so it consumes least current * The lens position is gradually moved in units of DW9714_CTRL_STEPS, * to make the movements smoothly. */
static int __maybe_unused dw9714_vcm_suspend(struct device *dev) { struct i2c_client *client = to_i2c_client(dev); struct v4l2_subdev *sd = i2c_get_clientdata(client); struct dw9714_device *dw9714_dev = sd_to_dw9714_vcm(sd); int ret, val; for (val = dw9714_dev->current_val & ~(DW9714_CTRL_STEPS - 1); val >= 0; val -= DW9714_CTRL_STEPS) { ret = dw9714_i2c_write(client, DW9714_VAL(val, DW9714_DEFAULT_S)); if (ret) dev_err_once(dev, "%s I2C failure: %d", __func__, ret); usleep_range(DW9714_CTRL_DELAY_US, DW9714_CTRL_DELAY_US + 10); } return 0; }

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/* * This function sets the vcm position to the value set by the user * through v4l2_ctrl_ops s_ctrl handler * The lens position is gradually moved in units of DW9714_CTRL_STEPS, * to make the movements smoothly. */
static int __maybe_unused dw9714_vcm_resume(struct device *dev) { struct i2c_client *client = to_i2c_client(dev); struct v4l2_subdev *sd = i2c_get_clientdata(client); struct dw9714_device *dw9714_dev = sd_to_dw9714_vcm(sd); int ret, val; for (val = dw9714_dev->current_val % DW9714_CTRL_STEPS; val < dw9714_dev->current_val + DW9714_CTRL_STEPS - 1; val += DW9714_CTRL_STEPS) { ret = dw9714_i2c_write(client, DW9714_VAL(val, DW9714_DEFAULT_S)); if (ret) dev_err_ratelimited(dev, "%s I2C failure: %d", __func__, ret); usleep_range(DW9714_CTRL_DELAY_US, DW9714_CTRL_DELAY_US + 10); } return 0; }

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#ifdef CONFIG_ACPI static const struct acpi_device_id dw9714_acpi_match[] = { {}, }; MODULE_DEVICE_TABLE(acpi, dw9714_acpi_match); #endif static const struct i2c_device_id dw9714_id_table[] = { {DW9714_NAME, 0}, {} }; MODULE_DEVICE_TABLE(i2c, dw9714_id_table); static const struct dev_pm_ops dw9714_pm_ops = { SET_SYSTEM_SLEEP_PM_OPS(dw9714_vcm_suspend, dw9714_vcm_resume) SET_RUNTIME_PM_OPS(dw9714_vcm_suspend, dw9714_vcm_resume, NULL) }; static struct i2c_driver dw9714_i2c_driver = { .driver = { .name = DW9714_NAME, .pm = &dw9714_pm_ops, .acpi_match_table = ACPI_PTR(dw9714_acpi_match), }, .probe = dw9714_probe, .remove = dw9714_remove, .id_table = dw9714_id_table, }; module_i2c_driver(dw9714_i2c_driver); MODULE_AUTHOR("Tianshu Qiu <tian.shu.qiu@intel.com>"); MODULE_AUTHOR("Jian Xu Zheng <jian.xu.zheng@intel.com>"); MODULE_AUTHOR("Yuning Pu <yuning.pu@intel.com>"); MODULE_AUTHOR("Jouni Ukkonen <jouni.ukkonen@intel.com>"); MODULE_AUTHOR("Tommi Franttila <tommi.franttila@intel.com>"); MODULE_DESCRIPTION("DW9714 VCM driver"); MODULE_LICENSE("GPL v2");

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