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Date: Tue, 18 Oct 2016 20:31:33 +0200
From: Pavel Machek <pavel@....cz>
To: Ramiro Oliveira <Ramiro.Oliveira@...opsys.com>
Cc: linux-kernel@...r.kernel.org, linux-media@...r.kernel.org,
devicetree@...r.kernel.org, robh+dt@...nel.org,
mark.rutland@....com, mchehab@...nel.org, davem@...emloft.net,
geert@...ux-m68k.org, akpm@...ux-foundation.org,
kvalo@...eaurora.org, linux@...ck-us.net, hverkuil@...all.nl,
lars@...afoo.de, robert.jarzmik@...e.fr, slongerbeam@...il.com,
dheitmueller@...nellabs.com, pali.rohar@...il.com,
CARLOS.PALMINHA@...opsys.com
Subject: Re: [PATCH v3 2/2] Add support for Omnivision OV5647
Hi!
> +/*
> + * A V4L2 driver for OmniVision OV5647 cameras.
> + *
> + * Based on Samsung S5K6AAFX SXGA 1/6" 1.3M CMOS Image Sensor driver
> + * Copyright (C) 2011 Sylwester Nawrocki <s.nawrocki@...sung.com>
> + *
> + * Based on Omnivision OV7670 Camera Driver
> + * Copyright (C) 2006-7 Jonathan Corbet <corbet@....net>
> + *
> + * Copyright (C) 2016, Synopsys, Inc.
> + *
> + */
If you do copyrights, you should also specify license.
> +static bool debug;
> +module_param(debug, bool, 0644);
> +MODULE_PARM_DESC(debug, "Debug level (0-1)");
Please remove, we have generic infrastructure for debugging.
> +/*
> + * The ov5647 sits on i2c with ID 0x6c
> + */
> +#define OV5647_I2C_ADDR 0x6c
> +#define SENSOR_NAME "ov5647"
> +
> +#define OV5647_REG_CHIPID_H 0x300A
> +#define OV5647_REG_CHIPID_L 0x300B
> +
> +#define REG_TERM 0xfffe
> +#define VAL_TERM 0xfe
> +#define REG_DLY 0xffff
> +
> +/*define the voltage level of control signal*/
"/* ", " */".
> +#define CSI_STBY_ON 1
> +#define CSI_STBY_OFF 0
> +#define CSI_RST_ON 0
> +#define CSI_RST_OFF 1
> +#define CSI_PWR_ON 1
> +#define CSI_PWR_OFF 0
> +#define CSI_AF_PWR_ON 1
> +#define CSI_AF_PWR_OFF 0
...
> +enum power_seq_cmd {
> + CSI_SUBDEV_PWR_OFF = 0x00,
> + CSI_SUBDEV_PWR_ON = 0x01,
> +};
Pick one style for defines/enums?
> +struct regval_list {
> + uint16_t addr;
> + uint8_t data;
> +};
u8/u16?
> +/**
> +* @short I2C Write operation
> +* @param[in] i2c_client I2C client
> +* @param[in] reg register address
> +* @param[in] val value to write
> +* @return Error code
> +*/
" *"?
> +static int ov5647_write(struct v4l2_subdev *sd, uint16_t reg, uint8_t val)
> +{
> + int ret;
> + unsigned char data[3] = { reg >> 8, reg & 0xff, val};
" }".
> +static int ov5647_write_array(struct v4l2_subdev *subdev,
> + struct regval_list *regs, int array_size)
> +{
> + int i = 0;
> + int ret = 0;
> +
> + if (!regs)
> + return -EINVAL;
> +
> + while (i < array_size) {
> + if (regs->addr == REG_DLY)
> + mdelay(regs->data);
> + else
> + ret = ov5647_write(subdev, regs->addr, regs->data);
The "REG_DLY" is never used AFAICT? Remove?
> + if (ret == -EIO)
> + return ret;
> +
ov5647_write() can return errors other then EIO. Are they handled correctly?
> +/**
> + * @short Set SW standby
> + * @param[in] subdev v4l2 subdev
> + * @param[in] on_off standby on or off
> + * @return Error code
> + */
> +static int sensor_s_sw_stby(struct v4l2_subdev *subdev, int on_off)
> +{
> + int ret;
> + unsigned char rdval;
> +
> + ret = ov5647_read(subdev, 0x0100, &rdval);
> + if (ret != 0)
> + return ret;
> +
> + if (on_off == CSI_STBY_ON)
> + ret = ov5647_write(subdev, 0x0100, rdval&0xfe);
> +
> + else
> + ret = ov5647_write(subdev, 0x0100, rdval|0x01);
I'd get rid of CSI_STBY_ON, and convert arg to bool, as you don't
really handle other values. Plus, naming it "set_sw_standby()" would
make core slightly more readable. Also kill the empty line before
else.
> +/**
> +* @short Initialize sensor
> +* @param[in] subdev v4l2 subdev
> +* @param[in] val not used
> +* @return Error code
> +*/
> +static int __sensor_init(struct v4l2_subdev *subdev)
> +{
> + int ret;
> + uint8_t resetval;
> + unsigned char rdval;
u8 for both?
> + ov5647_read(subdev, 0x0100, &resetval);
> + if (!resetval&0x01) {
> + v4l2_dbg(1, debug, subdev,
> + "DEVICE WAS IN SOFTWARE STANDBY");
No shouting please? If it is important maybe it should have higher
priority?
> +static int sensor_power(struct v4l2_subdev *subdev, int on)
> +{
> + int ret;
> + struct ov5647 *ov5647 = to_state(subdev);
> +
> + ret = 0;
> + mutex_lock(&ov5647->lock);
> +
> + switch (on) {
> + case CSI_SUBDEV_PWR_OFF:
...
> + case CSI_SUBDEV_PWR_ON:
...
> + default:
> + return -EINVAL;
> + }
> +
> + mutex_unlock(&ov5647->lock);
I'd really convert this to bool. Note how it returns with lock held?
> +int ov5647_detect(struct v4l2_subdev *sd)
> +{
> + unsigned char v;
> + int ret;
> +
> + ret = sensor_power(sd, 1);
> + if (ret < 0)
> + return ret;
> + ret = ov5647_read(sd, OV5647_REG_CHIPID_H, &v);
> + if (ret < 0)
> + return ret;
> + if (v != 0x56) /* OV manuf. id. */
> + return -ENODEV;
> + ret = ov5647_read(sd, OV5647_REG_CHIPID_L, &v);
> + if (ret < 0)
> + return ret;
> + if (v != 0x47)
> + return -ENODEV;
I guess invalid chipid deserves a printk?
> +* Refer to Linux errors.
Useful?
> +/**
> +* @short of_device_id structure
> +*/
> +static const struct i2c_device_id ov5647_id[] = {
Umm. The comment looks useless and wrong.
Best regards,
Pavel
--
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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