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From d67eece3a8ba9e8961e6050129f6f76d31924d62 Mon Sep 17 00:00:00 2001
From: Daniel Scally <djrscally@gmail.com>
Date: Tue, 15 Feb 2022 23:07:34 +0000
Subject: [PATCH] media: i2c: Add ov7251_detect_chip()
.probe() is quite busy for this driver; make it cleaner by moving the
chip verification to a dedicated function.
Signed-off-by: Daniel Scally <djrscally@gmail.com>
---
drivers/media/i2c/ov7251.c | 62 +++++++++++++++++++++-----------------
1 file changed, 35 insertions(+), 27 deletions(-)
--- a/drivers/media/i2c/ov7251.c
+++ b/drivers/media/i2c/ov7251.c
@@ -1442,12 +1442,44 @@ out_free_bus_cfg:
return ret;
}
+static int ov7251_detect_chip(struct ov7251 *ov7251)
+{
+ u8 chip_id_high, chip_id_low, chip_rev;
+ int ret;
+
+ ret = ov7251_read_reg(ov7251, OV7251_CHIP_ID_HIGH, &chip_id_high);
+ if (ret < 0 || chip_id_high != OV7251_CHIP_ID_HIGH_BYTE)
+ return dev_err_probe(ov7251->dev, -ENODEV,
+ "could not read ID high\n");
+
+ ret = ov7251_read_reg(ov7251, OV7251_CHIP_ID_LOW, &chip_id_low);
+ if (ret < 0 || chip_id_low != OV7251_CHIP_ID_LOW_BYTE)
+ return dev_err_probe(ov7251->dev, -ENODEV,
+ "could not read ID low\n");
+
+ ret = ov7251_read_reg(ov7251, OV7251_SC_GP_IO_IN1, &chip_rev);
+ if (ret < 0)
+ return dev_err_probe(ov7251->dev, -ENODEV,
+ "could not read revision\n");
+ chip_rev >>= 4;
+
+ dev_info(ov7251->dev,
+ "OV7251 revision %x (%s) detected at address 0x%02x\n",
+ chip_rev,
+ chip_rev == 0x4 ? "1A / 1B" :
+ chip_rev == 0x5 ? "1C / 1D" :
+ chip_rev == 0x6 ? "1E" :
+ chip_rev == 0x7 ? "1F" : "unknown",
+ ov7251->i2c_client->addr);
+
+ return 0;
+}
+
static int ov7251_probe(struct i2c_client *client)
{
struct v4l2_fwnode_device_properties props;
struct device *dev = &client->dev;
struct ov7251 *ov7251;
- u8 chip_id_high, chip_id_low, chip_rev;
unsigned int rate = 0;
int ret;
int i;
@@ -1589,34 +1621,10 @@ static int ov7251_probe(struct i2c_clien
goto free_entity;
}
- ret = ov7251_read_reg(ov7251, OV7251_CHIP_ID_HIGH, &chip_id_high);
- if (ret < 0 || chip_id_high != OV7251_CHIP_ID_HIGH_BYTE) {
- dev_err(dev, "could not read ID high\n");
- ret = -ENODEV;
- goto power_down;
- }
- ret = ov7251_read_reg(ov7251, OV7251_CHIP_ID_LOW, &chip_id_low);
- if (ret < 0 || chip_id_low != OV7251_CHIP_ID_LOW_BYTE) {
- dev_err(dev, "could not read ID low\n");
- ret = -ENODEV;
- goto power_down;
- }
-
- ret = ov7251_read_reg(ov7251, OV7251_SC_GP_IO_IN1, &chip_rev);
- if (ret < 0) {
- dev_err(dev, "could not read revision\n");
- ret = -ENODEV;
+ ret = ov7251_detect_chip(ov7251);
+ if (ret)
goto power_down;
- }
- chip_rev >>= 4;
- dev_info(dev, "OV7251 revision %x (%s) detected at address 0x%02x\n",
- chip_rev,
- chip_rev == 0x4 ? "1A / 1B" :
- chip_rev == 0x5 ? "1C / 1D" :
- chip_rev == 0x6 ? "1E" :
- chip_rev == 0x7 ? "1F" : "unknown",
- client->addr);
ret = ov7251_read_reg(ov7251, OV7251_PRE_ISP_00,
&ov7251->pre_isp_00);
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