From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-15.0 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, MENTIONS_GIT_HOSTING,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id A3D1EC433E2 for ; Wed, 2 Sep 2020 13:45:15 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 768E820773 for ; Wed, 2 Sep 2020 13:45:15 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727877AbgIBNpA (ORCPT ); Wed, 2 Sep 2020 09:45:00 -0400 Received: from mga09.intel.com ([134.134.136.24]:34948 "EHLO mga09.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727835AbgIBNoo (ORCPT ); Wed, 2 Sep 2020 09:44:44 -0400 IronPort-SDR: 1ikf0tUnau0PXFwyOrzq2zojleK0Em1cALe0rQ25mQfxY8e+3z3JAvCp4Rb80QD40YH7uT1EhL qQNd8D0VZu7g== X-IronPort-AV: E=McAfee;i="6000,8403,9731"; a="158378097" X-IronPort-AV: E=Sophos;i="5.76,383,1592895600"; d="scan'208";a="158378097" X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga008.jf.intel.com ([10.7.209.65]) by orsmga102.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 02 Sep 2020 06:44:28 -0700 IronPort-SDR: 4rZxt/SD0kaay9OU45I7UXeuBUD/hOi++U0o2MhBNpmzsjNGwmYTuRJaKbWv7o/iRZXXDYG/NZ tcmb2hkGW0eQ== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.76,383,1592895600"; d="scan'208";a="331438037" Received: from smile.fi.intel.com (HELO smile) ([10.237.68.40]) by orsmga008.jf.intel.com with ESMTP; 02 Sep 2020 06:44:23 -0700 Received: from andy by smile with local (Exim 4.94) (envelope-from ) id 1kDT3l-00DjdQ-1r; Wed, 02 Sep 2020 16:44:21 +0300 Date: Wed, 2 Sep 2020 16:44:21 +0300 From: Andy Shevchenko To: Dongchun Zhu Cc: mchehab@kernel.org, robh+dt@kernel.org, mark.rutland@arm.com, sakari.ailus@linux.intel.com, drinkcat@chromium.org, tfiga@chromium.org, matthias.bgg@gmail.com, bingbu.cao@intel.com, srv_heupstream@mediatek.com, linux-mediatek@lists.infradead.org, linux-arm-kernel@lists.infradead.org, sj.huang@mediatek.com, linux-media@vger.kernel.org, devicetree@vger.kernel.org, louis.kuo@mediatek.com, shengnan.wang@mediatek.com Subject: Re: [PATCH v14 2/2] media: i2c: Add OV02A10 image sensor driver Message-ID: <20200902134421.GN1891694@smile.fi.intel.com> References: <20200902120122.24456-1-dongchun.zhu@mediatek.com> <20200902120122.24456-3-dongchun.zhu@mediatek.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20200902120122.24456-3-dongchun.zhu@mediatek.com> Organization: Intel Finland Oy - BIC 0357606-4 - Westendinkatu 7, 02160 Espoo Sender: devicetree-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: devicetree@vger.kernel.org On Wed, Sep 02, 2020 at 08:01:22PM +0800, Dongchun Zhu wrote: > Add a V4L2 sub-device driver for OmniVision OV02A10 image sensor. > Some nit-picks below, after addressing, FWIW, Reviewed-by: Andy Shevchenko > Signed-off-by: Dongchun Zhu > --- > MAINTAINERS | 1 + > drivers/media/i2c/Kconfig | 13 + > drivers/media/i2c/Makefile | 1 + > drivers/media/i2c/ov02a10.c | 1083 +++++++++++++++++++++++++++++++++++++++++++ > 4 files changed, 1098 insertions(+) > create mode 100644 drivers/media/i2c/ov02a10.c > > diff --git a/MAINTAINERS b/MAINTAINERS > index 48aa7a7..ce7d8fa 100644 > --- a/MAINTAINERS > +++ b/MAINTAINERS > @@ -12724,6 +12724,7 @@ L: linux-media@vger.kernel.org > S: Maintained > T: git git://linuxtv.org/media_tree.git > F: Documentation/devicetree/bindings/media/i2c/ovti,ov02a10.yaml > +F: drivers/media/i2c/ov02a10.c > > OMNIVISION OV13858 SENSOR DRIVER > M: Sakari Ailus > diff --git a/drivers/media/i2c/Kconfig b/drivers/media/i2c/Kconfig > index 48ae60a..f458804 100644 > --- a/drivers/media/i2c/Kconfig > +++ b/drivers/media/i2c/Kconfig > @@ -825,6 +825,19 @@ config VIDEO_IMX355 > To compile this driver as a module, choose M here: the > module will be called imx355. > > +config VIDEO_OV02A10 > + tristate "OmniVision OV02A10 sensor support" > + depends on I2C && VIDEO_V4L2 Dunno if V4L2 modules allow COMPILE_TEST, but looking below, can we stick with one pattern like depends on VIDEO_V4L2 && I2C ? Or is it the opposite (de facto in use)? > + select MEDIA_CONTROLLER > + select VIDEO_V4L2_SUBDEV_API > + select V4L2_FWNODE > + help > + This is a Video4Linux2 sensor driver for the OmniVision > + OV02A10 camera sensor. > + > + To compile this driver as a module, choose M here: the > + module will be called ov02a10. > + > config VIDEO_OV2640 > tristate "OmniVision OV2640 sensor support" > depends on VIDEO_V4L2 && I2C > diff --git a/drivers/media/i2c/Makefile b/drivers/media/i2c/Makefile > index f0a7747..dc27e14 100644 > --- a/drivers/media/i2c/Makefile > +++ b/drivers/media/i2c/Makefile > @@ -64,6 +64,7 @@ obj-$(CONFIG_VIDEO_VP27SMPX) += vp27smpx.o > obj-$(CONFIG_VIDEO_SONY_BTF_MPX) += sony-btf-mpx.o > obj-$(CONFIG_VIDEO_UPD64031A) += upd64031a.o > obj-$(CONFIG_VIDEO_UPD64083) += upd64083.o > +obj-$(CONFIG_VIDEO_OV02A10) += ov02a10.o > obj-$(CONFIG_VIDEO_OV2640) += ov2640.o > obj-$(CONFIG_VIDEO_OV2680) += ov2680.o > obj-$(CONFIG_VIDEO_OV2685) += ov2685.o > diff --git a/drivers/media/i2c/ov02a10.c b/drivers/media/i2c/ov02a10.c > new file mode 100644 > index 0000000..1f8c525 > --- /dev/null > +++ b/drivers/media/i2c/ov02a10.c > @@ -0,0 +1,1083 @@ > +// SPDX-License-Identifier: GPL-2.0 > +// Copyright (c) 2020 MediaTek Inc. > + > +#include > +#include > +#include > +#include > +#include > +#include > +#include > +#include > +#include > +#include > +#include > +#include > +#include > + > +#define CHIP_ID 0x2509 > +#define OV02A10_REG_CHIP_ID_H 0x02 > +#define OV02A10_REG_CHIP_ID_L 0x03 > + > +/* Bit[1] vertical upside down */ > +/* Bit[0] horizontal mirror */ > +#define REG_MIRROR_FLIP_CONTROL 0x3f > + > +/* Orientation */ > +#define REG_MIRROR_FLIP_ENABLE 0x03 > + > +/* Bit[2:0] MIPI transmission speed select */ > +#define TX_SPEED_AREA_SEL 0xa1 > +#define OV02A10_MIPI_TX_SPEED_DEFAULT 0x04 > + > +#define REG_PAGE_SWITCH 0xfd > +#define REG_GLOBAL_EFFECTIVE 0x01 > +#define REG_ENABLE BIT(0) > + > +#define REG_SC_CTRL_MODE 0xac > +#define SC_CTRL_MODE_STANDBY 0x00 > +#define SC_CTRL_MODE_STREAMING 0x01 > + > +#define OV02A10_EXP_SHIFT 8 > +#define OV02A10_REG_EXPOSURE_H 0x03 > +#define OV02A10_REG_EXPOSURE_L 0x04 > +#define OV02A10_EXPOSURE_MIN 4 > +#define OV02A10_EXPOSURE_MAX_MARGIN 4 > +#define OV02A10_EXPOSURE_STEP 1 > + > +#define OV02A10_VTS_SHIFT 8 > +#define OV02A10_REG_VTS_H 0x05 > +#define OV02A10_REG_VTS_L 0x06 > +#define OV02A10_VTS_MAX 0x209f Hex? (1) > +#define OV02A10_BASIC_LINE 1224 Decimal? (2) > + > +#define OV02A10_REG_GAIN 0x24 > +#define OV02A10_GAIN_MIN 0x10 > +#define OV02A10_GAIN_MAX 0xf8 > +#define OV02A10_GAIN_STEP 0x01 > +#define OV02A10_GAIN_DEFAULT 0x40 Not sure why these are in hex, but okay. Probably a reason behind (1) and (2) as well. > +/* Test pattern control */ > +#define OV02A10_REG_TEST_PATTERN 0xb6 I'm wondering if you can rearrange registers that they will be sorted by value. > +#define HZ_PER_MHZ 1000000L > +#define OV02A10_LINK_FREQ_390MHZ (390 * HZ_PER_MHZ) > +#define OV02A10_ECLK_FREQ (24 * HZ_PER_MHZ) > +#define OV02A10_DATA_LANES 1 > +#define OV02A10_BITS_PER_SAMPLE 10 > + > +static const char * const ov02a10_supply_names[] = { > + "dovdd", /* Digital I/O power */ > + "avdd", /* Analog power */ > + "dvdd", /* Digital core power */ > +}; > + > +struct ov02a10_reg { > + u8 addr; > + u8 val; > +}; > + > +struct ov02a10_reg_list { > + u32 num_of_regs; > + const struct ov02a10_reg *regs; > +}; > + > +struct ov02a10_mode { > + u32 width; > + u32 height; > + u32 exp_def; > + u32 hts_def; > + u32 vts_def; > + const struct ov02a10_reg_list reg_list; > +}; > + > +struct ov02a10 { > + u32 eclk_freq; > + /* Indication of MIPI transmission speed select */ > + u32 mipi_clock_voltage; > + /* Index of link frequency config to be used */ > + u32 freq_index; > + > + struct clk *eclk; > + struct gpio_desc *pd_gpio; > + struct gpio_desc *rst_gpio; > + struct regulator_bulk_data supplies[ARRAY_SIZE(ov02a10_supply_names)]; > + > + bool streaming; > + bool upside_down; > + > + /* > + * Serialize control access, get/set format, get selection > + * and start streaming. > + */ > + struct mutex mutex; > + struct v4l2_subdev subdev; > + struct media_pad pad; > + struct v4l2_mbus_framefmt fmt; > + struct v4l2_ctrl_handler ctrl_handler; > + struct v4l2_ctrl *exposure; > + > + const struct ov02a10_mode *cur_mode; > +}; > + > +static inline struct ov02a10 *to_ov02a10(struct v4l2_subdev *sd) > +{ > + return container_of(sd, struct ov02a10, subdev); > +} > + > +/* > + * eclk 24Mhz > + * pclk 39Mhz > + * linelength 934(0x3a6) > + * framelength 1390(0x56E) > + * grabwindow_width 1600 > + * grabwindow_height 1200 > + * max_framerate 30fps > + * mipi_datarate per lane 780Mbps > + */ > +static const struct ov02a10_reg ov02a10_1600x1200_regs[] = { > + {0xfd, 0x01}, > + {0xac, 0x00}, > + {0xfd, 0x00}, > + {0x2f, 0x29}, > + {0x34, 0x00}, > + {0x35, 0x21}, > + {0x30, 0x15}, > + {0x33, 0x01}, > + {0xfd, 0x01}, > + {0x44, 0x00}, > + {0x2a, 0x4c}, > + {0x2b, 0x1e}, > + {0x2c, 0x60}, > + {0x25, 0x11}, > + {0x03, 0x01}, > + {0x04, 0xae}, > + {0x09, 0x00}, > + {0x0a, 0x02}, > + {0x06, 0xa6}, > + {0x31, 0x00}, > + {0x24, 0x40}, > + {0x01, 0x01}, > + {0xfb, 0x73}, > + {0xfd, 0x01}, > + {0x16, 0x04}, > + {0x1c, 0x09}, > + {0x21, 0x42}, > + {0x12, 0x04}, > + {0x13, 0x10}, > + {0x11, 0x40}, > + {0x33, 0x81}, > + {0xd0, 0x00}, > + {0xd1, 0x01}, > + {0xd2, 0x00}, > + {0x50, 0x10}, > + {0x51, 0x23}, > + {0x52, 0x20}, > + {0x53, 0x10}, > + {0x54, 0x02}, > + {0x55, 0x20}, > + {0x56, 0x02}, > + {0x58, 0x48}, > + {0x5d, 0x15}, > + {0x5e, 0x05}, > + {0x66, 0x66}, > + {0x68, 0x68}, > + {0x6b, 0x00}, > + {0x6c, 0x00}, > + {0x6f, 0x40}, > + {0x70, 0x40}, > + {0x71, 0x0a}, > + {0x72, 0xf0}, > + {0x73, 0x10}, > + {0x75, 0x80}, > + {0x76, 0x10}, > + {0x84, 0x00}, > + {0x85, 0x10}, > + {0x86, 0x10}, > + {0x87, 0x00}, > + {0x8a, 0x22}, > + {0x8b, 0x22}, > + {0x19, 0xf1}, > + {0x29, 0x01}, > + {0xfd, 0x01}, > + {0x9d, 0x16}, > + {0xa0, 0x29}, > + {0xa1, 0x04}, > + {0xad, 0x62}, > + {0xae, 0x00}, > + {0xaf, 0x85}, > + {0xb1, 0x01}, > + {0x8e, 0x06}, > + {0x8f, 0x40}, > + {0x90, 0x04}, > + {0x91, 0xb0}, > + {0x45, 0x01}, > + {0x46, 0x00}, > + {0x47, 0x6c}, > + {0x48, 0x03}, > + {0x49, 0x8b}, > + {0x4a, 0x00}, > + {0x4b, 0x07}, > + {0x4c, 0x04}, > + {0x4d, 0xb7}, > + {0xf0, 0x40}, > + {0xf1, 0x40}, > + {0xf2, 0x40}, > + {0xf3, 0x40}, > + {0x3f, 0x00}, > + {0xfd, 0x01}, > + {0x05, 0x00}, > + {0x06, 0xa6}, > + {0xfd, 0x01}, > +}; > + > +static const char * const ov02a10_test_pattern_menu[] = { > + "Disabled", > + "Eight Vertical Colour Bars", > +}; > + > +static const s64 link_freq_menu_items[] = { > + OV02A10_LINK_FREQ_390MHZ, > +}; > + > +static u64 to_pixel_rate(u32 f_index) > +{ > + u64 pixel_rate = link_freq_menu_items[f_index] * 2 * OV02A10_DATA_LANES; > + > + do_div(pixel_rate, OV02A10_BITS_PER_SAMPLE); > + > + return pixel_rate; > +} > + > +static const struct ov02a10_mode supported_modes[] = { > + { > + .width = 1600, > + .height = 1200, > + .exp_def = 0x01ae, > + .hts_def = 0x03a6, > + .vts_def = 0x056e, > + .reg_list = { > + .num_of_regs = ARRAY_SIZE(ov02a10_1600x1200_regs), > + .regs = ov02a10_1600x1200_regs, > + }, > + }, > +}; > + > +static int ov02a10_write_array(struct ov02a10 *ov02a10, > + const struct ov02a10_reg_list *r_list) > +{ > + struct i2c_client *client = v4l2_get_subdevdata(&ov02a10->subdev); > + unsigned int i; > + int ret; > + > + for (i = 0; i < r_list->num_of_regs; i++) { > + ret = i2c_smbus_write_byte_data(client, r_list->regs[i].addr, > + r_list->regs[i].val); > + if (ret < 0) > + return ret; > + } > + > + return 0; > +} > + > +static int ov02a10_read_smbus(struct ov02a10 *ov02a10, unsigned char reg, > + unsigned char *val) > +{ > + struct i2c_client *client = v4l2_get_subdevdata(&ov02a10->subdev); > + int ret; > + > + ret = i2c_smbus_read_byte_data(client, reg); > + if (ret < 0) > + return ret; > + > + *val = (unsigned char)ret; No sure why you have casting and why returned value is not u8. > + return 0; > +} > + > +static void ov02a10_fill_fmt(const struct ov02a10_mode *mode, > + struct v4l2_mbus_framefmt *fmt) > +{ > + fmt->width = mode->width; > + fmt->height = mode->height; > + fmt->field = V4L2_FIELD_NONE; > +} > + > +static int ov02a10_set_fmt(struct v4l2_subdev *sd, > + struct v4l2_subdev_pad_config *cfg, > + struct v4l2_subdev_format *fmt) > +{ > + struct ov02a10 *ov02a10 = to_ov02a10(sd); > + struct v4l2_mbus_framefmt *mbus_fmt = &fmt->format; > + struct v4l2_mbus_framefmt *frame_fmt; > + int ret = 0; > + > + mutex_lock(&ov02a10->mutex); > + > + if (ov02a10->streaming && fmt->which == V4L2_SUBDEV_FORMAT_ACTIVE) { > + ret = -EBUSY; > + goto error; > + } > + > + /* Only one sensor mode supported */ > + mbus_fmt->code = ov02a10->fmt.code; > + ov02a10_fill_fmt(ov02a10->cur_mode, mbus_fmt); > + > + if (fmt->which == V4L2_SUBDEV_FORMAT_TRY) > + frame_fmt = v4l2_subdev_get_try_format(sd, cfg, 0); > + else > + frame_fmt = &ov02a10->fmt; > + > + *frame_fmt = *mbus_fmt; > + > +error: Like in other places be more precise out_unlock: > + mutex_unlock(&ov02a10->mutex); > + return ret; > +} > + > +static int ov02a10_get_fmt(struct v4l2_subdev *sd, > + struct v4l2_subdev_pad_config *cfg, > + struct v4l2_subdev_format *fmt) > +{ > + struct ov02a10 *ov02a10 = to_ov02a10(sd); > + struct v4l2_mbus_framefmt *mbus_fmt = &fmt->format; > + > + mutex_lock(&ov02a10->mutex); > + > + if (fmt->which == V4L2_SUBDEV_FORMAT_TRY) { > + fmt->format = *v4l2_subdev_get_try_format(sd, cfg, fmt->pad); > + } else { > + fmt->format = ov02a10->fmt; > + mbus_fmt->code = ov02a10->fmt.code; > + ov02a10_fill_fmt(ov02a10->cur_mode, mbus_fmt); > + } > + > + mutex_unlock(&ov02a10->mutex); > + > + return 0; > +} > + > +static int ov02a10_enum_mbus_code(struct v4l2_subdev *sd, > + struct v4l2_subdev_pad_config *cfg, > + struct v4l2_subdev_mbus_code_enum *code) > +{ > + struct ov02a10 *ov02a10 = to_ov02a10(sd); > + > + if (code->index != 0) > + return -EINVAL; > + > + code->code = ov02a10->fmt.code; > + > + return 0; > +} > + > +static int ov02a10_enum_frame_sizes(struct v4l2_subdev *sd, > + struct v4l2_subdev_pad_config *cfg, > + struct v4l2_subdev_frame_size_enum *fse) > +{ > + if (fse->index >= ARRAY_SIZE(supported_modes)) > + return -EINVAL; > + > + fse->min_width = supported_modes[fse->index].width; > + fse->max_width = supported_modes[fse->index].width; > + fse->max_height = supported_modes[fse->index].height; > + fse->min_height = supported_modes[fse->index].height; > + > + return 0; > +} > + > +static int ov02a10_check_sensor_id(struct ov02a10 *ov02a10) > +{ > + struct i2c_client *client = v4l2_get_subdevdata(&ov02a10->subdev); > + u16 id; > + u8 chip_id_h; > + u8 chip_id_l; > + int ret; > + > + /* Check sensor revision */ > + ret = ov02a10_read_smbus(ov02a10, OV02A10_REG_CHIP_ID_H, &chip_id_h); > + if (ret) > + return ret; > + > + ret = ov02a10_read_smbus(ov02a10, OV02A10_REG_CHIP_ID_L, &chip_id_l); > + if (ret) > + return ret; I'm wondering if above can be done in one bulk transfer (reading 16-bit value). > + id = (chip_id_h << 8) | chip_id_l; If above can be achieved, this one should be rather something like le16_to_cpu() (or be16) with corresponding type of chip_id. > + if (id != CHIP_ID) { > + dev_err(&client->dev, "Unexpected sensor id(%04x)\n", id); > + return -EINVAL; > + } > + > + return 0; > +} > + > +static int ov02a10_power_on(struct device *dev) > +{ > + struct i2c_client *client = to_i2c_client(dev); > + struct v4l2_subdev *sd = i2c_get_clientdata(client); struct v4l2_subdev *sd = dev_get_drvdata(dev); Same for the rest similar cases. > + struct ov02a10 *ov02a10 = to_ov02a10(sd); > + int ret; > + > + gpiod_set_value_cansleep(ov02a10->rst_gpio, 1); > + gpiod_set_value_cansleep(ov02a10->pd_gpio, 1); > + > + ret = clk_prepare_enable(ov02a10->eclk); > + if (ret < 0) { > + dev_err(dev, "failed to enable eclk\n"); > + return ret; > + } > + > + ret = regulator_bulk_enable(ARRAY_SIZE(ov02a10_supply_names), > + ov02a10->supplies); > + if (ret < 0) { > + dev_err(dev, "failed to enable regulators\n"); > + goto disable_clk; > + } > + usleep_range(5000, 6000); > + > + gpiod_set_value_cansleep(ov02a10->pd_gpio, 0); > + usleep_range(5000, 6000); > + > + gpiod_set_value_cansleep(ov02a10->rst_gpio, 0); > + usleep_range(5000, 6000); > + > + ret = ov02a10_check_sensor_id(ov02a10); > + if (ret) > + goto disable_regulator; > + > + return 0; > + > +disable_regulator: > + regulator_bulk_disable(ARRAY_SIZE(ov02a10_supply_names), > + ov02a10->supplies); > +disable_clk: > + clk_disable_unprepare(ov02a10->eclk); > + > + return ret; > +} > + > +static int ov02a10_power_off(struct device *dev) > +{ > + struct i2c_client *client = to_i2c_client(dev); > + struct v4l2_subdev *sd = i2c_get_clientdata(client); > + struct ov02a10 *ov02a10 = to_ov02a10(sd); > + > + gpiod_set_value_cansleep(ov02a10->rst_gpio, 1); > + clk_disable_unprepare(ov02a10->eclk); > + gpiod_set_value_cansleep(ov02a10->pd_gpio, 1); > + regulator_bulk_disable(ARRAY_SIZE(ov02a10_supply_names), > + ov02a10->supplies); > + > + return 0; > +} > + > +static int __ov02a10_start_stream(struct ov02a10 *ov02a10) > +{ > + struct i2c_client *client = v4l2_get_subdevdata(&ov02a10->subdev); > + const struct ov02a10_reg_list *reg_list; > + int ret; > + > + /* Apply default values of current mode */ > + reg_list = &ov02a10->cur_mode->reg_list; > + ret = ov02a10_write_array(ov02a10, reg_list); > + if (ret) > + return ret; > + > + /* Apply customized values from user */ > + ret = __v4l2_ctrl_handler_setup(ov02a10->subdev.ctrl_handler); > + if (ret) > + return ret; > + > + /* Set orientation to 180 degree */ > + if (ov02a10->upside_down) { > + ret = i2c_smbus_write_byte_data(client, REG_MIRROR_FLIP_CONTROL, > + REG_MIRROR_FLIP_ENABLE); > + if (ret) { > + dev_err(&client->dev, "failed to set orientation\n"); > + return ret; > + } > + ret = i2c_smbus_write_byte_data(client, REG_GLOBAL_EFFECTIVE, > + REG_ENABLE); > + if (ret < 0) > + return ret; > + } > + > + /* Set MIPI TX speed according to DT property */ > + if (ov02a10->mipi_clock_voltage != OV02A10_MIPI_TX_SPEED_DEFAULT) { > + ret = i2c_smbus_write_byte_data(client, TX_SPEED_AREA_SEL, > + ov02a10->mipi_clock_voltage); > + if (ret < 0) > + return ret; > + } > + > + /* Set stream on register */ > + return i2c_smbus_write_byte_data(client, REG_SC_CTRL_MODE, > + SC_CTRL_MODE_STREAMING); > +} > + > +static int __ov02a10_stop_stream(struct ov02a10 *ov02a10) > +{ > + struct i2c_client *client = v4l2_get_subdevdata(&ov02a10->subdev); > + > + return i2c_smbus_write_byte_data(client, REG_SC_CTRL_MODE, > + SC_CTRL_MODE_STANDBY); > +} > + > +static int ov02a10_entity_init_cfg(struct v4l2_subdev *sd, > + struct v4l2_subdev_pad_config *cfg) > +{ > + struct v4l2_subdev_format fmt = { > + .which = V4L2_SUBDEV_FORMAT_TRY, > + .format = { > + .width = 1600, > + .height = 1200, > + } > + }; > + > + ov02a10_set_fmt(sd, cfg, &fmt); > + > + return 0; > +} > + > +static int ov02a10_s_stream(struct v4l2_subdev *sd, int on) > +{ > + struct ov02a10 *ov02a10 = to_ov02a10(sd); > + struct i2c_client *client = v4l2_get_subdevdata(&ov02a10->subdev); > + int ret; > + > + mutex_lock(&ov02a10->mutex); > + > + if (ov02a10->streaming == on) > + goto unlock_and_return; > + > + if (on) { > + ret = pm_runtime_get_sync(&client->dev); > + if (ret < 0) { > + pm_runtime_put_noidle(&client->dev); > + goto unlock_and_return; > + } > + > + ret = __ov02a10_start_stream(ov02a10); > + if (ret) { > + __ov02a10_stop_stream(ov02a10); > + ov02a10->streaming = !on; > + goto err_rpm_put; > + } > + } else { > + __ov02a10_stop_stream(ov02a10); > + pm_runtime_put(&client->dev); > + } > + > + ov02a10->streaming = on; > + mutex_unlock(&ov02a10->mutex); > + > + return 0; > + > +err_rpm_put: > + pm_runtime_put(&client->dev); > +unlock_and_return: > + mutex_unlock(&ov02a10->mutex); > + > + return ret; > +} > + > +static const struct dev_pm_ops ov02a10_pm_ops = { > + SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend, > + pm_runtime_force_resume) > + SET_RUNTIME_PM_OPS(ov02a10_power_off, ov02a10_power_on, NULL) > +}; > + > +/* > + * ov02a10_set_exposure - Function called when setting exposure time > + * @priv: Pointer to device structure > + * @val: Variable for exposure time, in the unit of micro-second > + * > + * Set exposure time based on input value. > + * > + * Return: 0 on success > + */ > +static int ov02a10_set_exposure(struct ov02a10 *ov02a10, int val) > +{ > + struct i2c_client *client = v4l2_get_subdevdata(&ov02a10->subdev); > + int ret; > + > + ret = i2c_smbus_write_byte_data(client, REG_PAGE_SWITCH, REG_ENABLE); > + if (ret < 0) > + return ret; > + > + ret = i2c_smbus_write_byte_data(client, OV02A10_REG_EXPOSURE_H, > + val >> OV02A10_EXP_SHIFT); > + if (ret < 0) > + return ret; > + > + ret = i2c_smbus_write_byte_data(client, OV02A10_REG_EXPOSURE_L, val); > + if (ret < 0) > + return ret; > + > + return i2c_smbus_write_byte_data(client, REG_GLOBAL_EFFECTIVE, > + REG_ENABLE); > +} > + > +static int ov02a10_set_gain(struct ov02a10 *ov02a10, int val) > +{ > + struct i2c_client *client = v4l2_get_subdevdata(&ov02a10->subdev); > + int ret; > + > + ret = i2c_smbus_write_byte_data(client, REG_PAGE_SWITCH, REG_ENABLE); > + if (ret < 0) > + return ret; > + > + ret = i2c_smbus_write_byte_data(client, OV02A10_REG_GAIN, val); > + if (ret < 0) > + return ret; > + > + return i2c_smbus_write_byte_data(client, REG_GLOBAL_EFFECTIVE, > + REG_ENABLE); > +} > + > +static int ov02a10_set_vblank(struct ov02a10 *ov02a10, int val) > +{ > + struct i2c_client *client = v4l2_get_subdevdata(&ov02a10->subdev); > + u32 vts = val + ov02a10->cur_mode->height - OV02A10_BASIC_LINE; > + int ret; > + > + ret = i2c_smbus_write_byte_data(client, REG_PAGE_SWITCH, REG_ENABLE); > + if (ret < 0) > + return ret; > + > + ret = i2c_smbus_write_byte_data(client, OV02A10_REG_VTS_H, > + vts >> OV02A10_VTS_SHIFT); > + if (ret < 0) > + return ret; > + > + ret = i2c_smbus_write_byte_data(client, OV02A10_REG_VTS_L, vts); > + if (ret < 0) > + return ret; > + > + return i2c_smbus_write_byte_data(client, REG_GLOBAL_EFFECTIVE, > + REG_ENABLE); > +} > + > +static int ov02a10_set_test_pattern(struct ov02a10 *ov02a10, int pattern) > +{ > + struct i2c_client *client = v4l2_get_subdevdata(&ov02a10->subdev); > + int ret; > + > + ret = i2c_smbus_write_byte_data(client, REG_PAGE_SWITCH, REG_ENABLE); > + if (ret < 0) > + return ret; > + > + ret = i2c_smbus_write_byte_data(client, OV02A10_REG_TEST_PATTERN, > + pattern); > + if (ret < 0) > + return ret; > + > + ret = i2c_smbus_write_byte_data(client, REG_GLOBAL_EFFECTIVE, > + REG_ENABLE); > + if (ret < 0) > + return ret; > + > + return i2c_smbus_write_byte_data(client, REG_SC_CTRL_MODE, > + SC_CTRL_MODE_STREAMING); > +} > + > +static int ov02a10_set_ctrl(struct v4l2_ctrl *ctrl) > +{ > + struct ov02a10 *ov02a10 = container_of(ctrl->handler, > + struct ov02a10, ctrl_handler); > + struct i2c_client *client = v4l2_get_subdevdata(&ov02a10->subdev); > + s64 max_expo; > + int ret; > + > + /* Propagate change of current control to all related controls */ > + if (ctrl->id == V4L2_CID_VBLANK) { > + /* Update max exposure while meeting expected vblanking */ > + max_expo = ov02a10->cur_mode->height + ctrl->val - > + OV02A10_EXPOSURE_MAX_MARGIN; > + __v4l2_ctrl_modify_range(ov02a10->exposure, > + ov02a10->exposure->minimum, max_expo, > + ov02a10->exposure->step, > + ov02a10->exposure->default_value); > + } > + > + /* V4L2 controls values will be applied only when power is already up */ > + if (!pm_runtime_get_if_in_use(&client->dev)) > + return 0; > + > + switch (ctrl->id) { > + case V4L2_CID_EXPOSURE: > + ret = ov02a10_set_exposure(ov02a10, ctrl->val); > + break; > + case V4L2_CID_ANALOGUE_GAIN: > + ret = ov02a10_set_gain(ov02a10, ctrl->val); > + break; > + case V4L2_CID_VBLANK: > + ret = ov02a10_set_vblank(ov02a10, ctrl->val); > + break; > + case V4L2_CID_TEST_PATTERN: > + ret = ov02a10_set_test_pattern(ov02a10, ctrl->val); > + break; > + default: > + ret = -EINVAL; > + break; > + }; > + > + pm_runtime_put(&client->dev); > + > + return ret; > +} > + > +static const struct v4l2_subdev_video_ops ov02a10_video_ops = { > + .s_stream = ov02a10_s_stream, > +}; > + > +static const struct v4l2_subdev_pad_ops ov02a10_pad_ops = { > + .init_cfg = ov02a10_entity_init_cfg, > + .enum_mbus_code = ov02a10_enum_mbus_code, > + .enum_frame_size = ov02a10_enum_frame_sizes, > + .get_fmt = ov02a10_get_fmt, > + .set_fmt = ov02a10_set_fmt, > +}; > + > +static const struct v4l2_subdev_ops ov02a10_subdev_ops = { > + .video = &ov02a10_video_ops, > + .pad = &ov02a10_pad_ops, > +}; > + > +static const struct media_entity_operations ov02a10_subdev_entity_ops = { > + .link_validate = v4l2_subdev_link_validate, > +}; > + > +static const struct v4l2_ctrl_ops ov02a10_ctrl_ops = { > + .s_ctrl = ov02a10_set_ctrl, > +}; > + > +static int ov02a10_initialize_controls(struct ov02a10 *ov02a10) > +{ > + struct i2c_client *client = v4l2_get_subdevdata(&ov02a10->subdev); > + const struct ov02a10_mode *mode; > + struct v4l2_ctrl_handler *handler; > + struct v4l2_ctrl *ctrl; > + s64 exposure_max; > + s64 vblank_def; > + s64 pixel_rate; > + s64 h_blank; > + int ret; > + > + handler = &ov02a10->ctrl_handler; > + mode = ov02a10->cur_mode; > + ret = v4l2_ctrl_handler_init(handler, 7); > + if (ret) > + return ret; > + > + handler->lock = &ov02a10->mutex; > + > + ctrl = v4l2_ctrl_new_int_menu(handler, NULL, V4L2_CID_LINK_FREQ, 0, 0, > + link_freq_menu_items); > + if (ctrl) > + ctrl->flags |= V4L2_CTRL_FLAG_READ_ONLY; > + > + pixel_rate = to_pixel_rate(0); > + v4l2_ctrl_new_std(handler, NULL, V4L2_CID_PIXEL_RATE, 0, pixel_rate, 1, > + pixel_rate); > + > + h_blank = mode->hts_def - mode->width; > + v4l2_ctrl_new_std(handler, NULL, V4L2_CID_HBLANK, h_blank, h_blank, 1, > + h_blank); > + > + vblank_def = mode->vts_def - mode->height; > + v4l2_ctrl_new_std(handler, &ov02a10_ctrl_ops, V4L2_CID_VBLANK, > + vblank_def, OV02A10_VTS_MAX - mode->height, 1, > + vblank_def); > + > + exposure_max = mode->vts_def - 4; > + ov02a10->exposure = v4l2_ctrl_new_std(handler, &ov02a10_ctrl_ops, > + V4L2_CID_EXPOSURE, > + OV02A10_EXPOSURE_MIN, > + exposure_max, > + OV02A10_EXPOSURE_STEP, > + mode->exp_def); > + > + v4l2_ctrl_new_std(handler, &ov02a10_ctrl_ops, > + V4L2_CID_ANALOGUE_GAIN, OV02A10_GAIN_MIN, > + OV02A10_GAIN_MAX, OV02A10_GAIN_STEP, > + OV02A10_GAIN_DEFAULT); > + > + v4l2_ctrl_new_std_menu_items(handler, &ov02a10_ctrl_ops, > + V4L2_CID_TEST_PATTERN, > + ARRAY_SIZE(ov02a10_test_pattern_menu) - 1, > + 0, 0, ov02a10_test_pattern_menu); > + > + if (handler->error) { > + ret = handler->error; > + dev_err(&client->dev, "failed to init controls(%d)\n", ret); > + goto err_free_handler; > + } > + > + ov02a10->subdev.ctrl_handler = handler; > + > + return 0; > + > +err_free_handler: > + v4l2_ctrl_handler_free(handler); > + > + return ret; > +} > + > +static int ov02a10_check_hwcfg(struct device *dev, struct ov02a10 *ov02a10) > +{ > + struct fwnode_handle *ep; > + struct fwnode_handle *fwnode = dev_fwnode(dev); > + struct v4l2_fwnode_endpoint bus_cfg = { > + .bus_type = V4L2_MBUS_CSI2_DPHY, > + }; > + unsigned int i, j; > + int ret; > + > + if (!fwnode) > + return -EINVAL; > + > + ep = fwnode_graph_get_next_endpoint(fwnode, NULL); > + if (!ep) > + return -ENXIO; > + > + ret = v4l2_fwnode_endpoint_alloc_parse(ep, &bus_cfg); > + fwnode_handle_put(ep); > + if (ret) > + return ret; > + > + if (!bus_cfg.nr_of_link_frequencies) { > + dev_err(dev, "no link frequencies defined\n"); > + ret = -EINVAL; > + goto check_hwcfg_error; > + } If it's 0, the below will break on 'if (j == 0)' with slightly different but informative enough message. What do you keep above check for? > + for (i = 0; i < ARRAY_SIZE(link_freq_menu_items); i++) { > + for (j = 0; j < bus_cfg.nr_of_link_frequencies; j++) { > + if (link_freq_menu_items[i] == > + bus_cfg.link_frequencies[j]) { > + ov02a10->freq_index = i; > + break; > + } > + } > + > + if (j == bus_cfg.nr_of_link_frequencies) { > + dev_err(dev, "no link frequency %lld supported\n", > + link_freq_menu_items[i]); > + ret = -EINVAL; > + goto check_hwcfg_error; 'break;' won't work? > + } > + } > + > +check_hwcfg_error: out_endpoint_free: > + v4l2_fwnode_endpoint_free(&bus_cfg); > + > + return ret; > +} > + > +static int ov02a10_probe(struct i2c_client *client) > +{ > + struct device *dev = &client->dev; > + struct ov02a10 *ov02a10; > + unsigned int rotation; > + unsigned int cnt = 0; > + unsigned int i; > + unsigned int num_freq_clk_volt = 2 * ARRAY_SIZE(link_freq_menu_items); Can it be moved upper to improve readability? > + int ret; > + > + ov02a10 = devm_kzalloc(dev, sizeof(*ov02a10), GFP_KERNEL); > + if (!ov02a10) > + return -ENOMEM; > + > + ret = ov02a10_check_hwcfg(dev, ov02a10); > + if (ret) { > + dev_err(dev, "failed to check HW configuration: %d\n", ret); > + return ret; > + } > + > + v4l2_i2c_subdev_init(&ov02a10->subdev, client, &ov02a10_subdev_ops); > + ov02a10->mipi_clock_voltage = OV02A10_MIPI_TX_SPEED_DEFAULT; > + ov02a10->fmt.code = MEDIA_BUS_FMT_SBGGR10_1X10; > + > + /* Optional indication of physical rotation of sensor */ > + ret = fwnode_property_read_u32(dev_fwnode(dev), "rotation", &rotation); > + if (!ret && rotation == 180) { Can be simplified (but I'm fine with above): unsigned int rotation = 0; ... fwnode_property_read_u32(..., &rotation); if (rotation == 180) { ... } > + ov02a10->upside_down = true; > + ov02a10->fmt.code = MEDIA_BUS_FMT_SRGGB10_1X10; > + } > + > + /* Optional indication of MIPI clock voltage unit */ > + ret = fwnode_property_read_u32_array(dev_fwnode(dev), > + "ovti,mipi-clock-voltage", NULL, > + 0); ret = fwnode_property_count_u32(...); // will be one line > + if (ret > 0 && ret % 2 == 0) { > + u32 freq_clk_volt[ret]; > + > + fwnode_property_read_u32_array(dev_fwnode(dev), > + "ovti,mipi-clock-voltage", > + freq_clk_volt, > + ARRAY_SIZE(freq_clk_volt)); > + > + while (num_freq_clk_volt) { > + unsigned long freq; > + unsigned long volt; > + > + if (cnt >= ARRAY_SIZE(freq_clk_volt)) { > + dev_warn(dev, "mismatched link frequency\n"); > + break; > + } > + > + freq = freq_clk_volt[cnt++] * 1000; HZ_PER_KHZ? > + volt = freq_clk_volt[cnt++]; > + > + /* Get clock voltage unit value from DT */ > + if (freq == link_freq_menu_items[ov02a10->freq_index]) { > + ov02a10->mipi_clock_voltage = volt; > + break; > + } > + > + num_freq_clk_volt -= 2; > + } > + } > + > + /* Get external input clock (eclk) */ > + ov02a10->eclk = devm_clk_get(dev, "eclk"); > + if (IS_ERR(ov02a10->eclk)) { > + ret = PTR_ERR(ov02a10->eclk); > + dev_err(dev, "failed to get eclk %d\n", ret); > + return ret; return dev_err_probe(...); > + } > + > + ret = fwnode_property_read_u32(dev_fwnode(dev), "clock-frequency", > + &ov02a10->eclk_freq); > + if (ret) { > + dev_err(dev, "failed to get eclk frequency\n"); > + return ret; > + } > + ret = clk_set_rate(ov02a10->eclk, ov02a10->eclk_freq); > + if (ret) { > + dev_err(dev, "failed to set eclk frequency (24MHz)\n"); > + return ret; > + } > + > + if (clk_get_rate(ov02a10->eclk) != OV02A10_ECLK_FREQ) { > + dev_warn(dev, "eclk mismatched, mode is based on 24MHz\n"); > + return -EINVAL; > + } > + > + ov02a10->pd_gpio = devm_gpiod_get(dev, "powerdown", GPIOD_OUT_HIGH); > + if (IS_ERR(ov02a10->pd_gpio)) { > + ret = PTR_ERR(ov02a10->pd_gpio); > + dev_err(dev, "failed to get powerdown-gpios %d\n", ret); > + return ret; return dev_err_probe(...); > + } > + > + ov02a10->rst_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH); > + if (IS_ERR(ov02a10->rst_gpio)) { > + ret = PTR_ERR(ov02a10->rst_gpio); > + dev_err(dev, "failed to get reset-gpios %d\n", ret); > + return ret; Ditto. > + } > + > + for (i = 0; i < ARRAY_SIZE(ov02a10_supply_names); i++) > + ov02a10->supplies[i].supply = ov02a10_supply_names[i]; > + > + ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(ov02a10_supply_names), > + ov02a10->supplies); > + if (ret) { > + dev_err(dev, "failed to get regulators\n"); > + return ret; Ditto. > + } > + > + mutex_init(&ov02a10->mutex); > + ov02a10->cur_mode = &supported_modes[0]; > + > + ret = ov02a10_initialize_controls(ov02a10); > + if (ret) { > + dev_err(dev, "failed to initialize controls\n"); > + goto err_destroy_mutex; > + } > + > + ov02a10->subdev.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE; > + ov02a10->subdev.entity.ops = &ov02a10_subdev_entity_ops; > + ov02a10->subdev.entity.function = MEDIA_ENT_F_CAM_SENSOR; > + ov02a10->pad.flags = MEDIA_PAD_FL_SOURCE; > + > + ret = media_entity_pads_init(&ov02a10->subdev.entity, 1, &ov02a10->pad); > + if (ret < 0) { > + dev_err(dev, "failed to init entity pads: %d", ret); > + goto err_free_handler; > + } > + > + pm_runtime_enable(dev); > + if (!pm_runtime_enabled(dev)) { > + ret = ov02a10_power_on(dev); > + if (ret < 0) { > + dev_err(dev, "failed to power on: %d\n", ret); > + goto err_clean_entity; > + } > + } > + > + ret = v4l2_async_register_subdev(&ov02a10->subdev); > + if (ret) { > + dev_err(dev, "failed to register V4L2 subdev: %d\n", ret); > + goto err_power_off; > + } > + > + return 0; > + > +err_power_off: > + if (pm_runtime_enabled(dev)) > + pm_runtime_disable(dev); > + else > + ov02a10_power_off(dev); > +err_clean_entity: > + media_entity_cleanup(&ov02a10->subdev.entity); > +err_free_handler: > + v4l2_ctrl_handler_free(ov02a10->subdev.ctrl_handler); > +err_destroy_mutex: > + mutex_destroy(&ov02a10->mutex); > + > + return ret; > +} > + > +static int ov02a10_remove(struct i2c_client *client) > +{ > + struct v4l2_subdev *sd = i2c_get_clientdata(client); > + struct ov02a10 *ov02a10 = to_ov02a10(sd); > + > + v4l2_async_unregister_subdev(sd); > + media_entity_cleanup(&sd->entity); > + v4l2_ctrl_handler_free(sd->ctrl_handler); > + pm_runtime_disable(&client->dev); > + if (!pm_runtime_status_suspended(&client->dev)) > + ov02a10_power_off(&client->dev); > + pm_runtime_set_suspended(&client->dev); > + mutex_destroy(&ov02a10->mutex); > + > + return 0; > +} > + > +static const struct of_device_id ov02a10_of_match[] = { > + { .compatible = "ovti,ov02a10" }, > + {} > +}; > +MODULE_DEVICE_TABLE(of, ov02a10_of_match); > + > +static struct i2c_driver ov02a10_i2c_driver = { > + .driver = { > + .name = "ov02a10", > + .pm = &ov02a10_pm_ops, > + .of_match_table = ov02a10_of_match, > + }, > + .probe_new = &ov02a10_probe, > + .remove = &ov02a10_remove, > +}; > + Redundant blank line. > +module_i2c_driver(ov02a10_i2c_driver); > + > +MODULE_AUTHOR("Dongchun Zhu "); > +MODULE_DESCRIPTION("OmniVision OV02A10 sensor driver"); > +MODULE_LICENSE("GPL v2"); > -- > 2.9.2 -- With Best Regards, Andy Shevchenko