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Date: Sun, 17 Apr 2022 14:09:59 +0200
From: Moses Christopher Bollavarapu <mosescb.dev@...il.com>
To: mchehab@...nel.org, linux-media@...r.kernel.org,
linux-kernel@...r.kernel.org
Cc: Moses Christopher Bollavarapu <mosescb.dev@...il.com>
Subject: [PATCH] media: i2c: tw2804: Use ARRAY_SIZE instead of manual checking
this driver currently uses a terminator(0xFF, 0xFF) to check for the
end of a reg-val list, instead a struct array with ARRAY_SIZE macro
from linux/kernel.h can be used to obtain the length of the array.
Signed-off-by: Moses Christopher Bollavarapu <mosescb.dev@...il.com>
---
drivers/media/i2c/tw2804.c | 177 +++++++++++++++++++------------------
1 file changed, 91 insertions(+), 86 deletions(-)
diff --git a/drivers/media/i2c/tw2804.c b/drivers/media/i2c/tw2804.c
index cd05f1ff504d..87842d178361 100644
--- a/drivers/media/i2c/tw2804.c
+++ b/drivers/media/i2c/tw2804.c
@@ -6,6 +6,7 @@
#include <linux/module.h>
#include <linux/init.h>
#include <linux/i2c.h>
+#include <linux/kernel.h>
#include <linux/videodev2.h>
#include <linux/ioctl.h>
#include <linux/slab.h>
@@ -32,75 +33,77 @@ struct tw2804 {
int norm;
};
-static const u8 global_registers[] = {
- 0x39, 0x00,
- 0x3a, 0xff,
- 0x3b, 0x84,
- 0x3c, 0x80,
- 0x3d, 0x80,
- 0x3e, 0x82,
- 0x3f, 0x82,
- 0x78, 0x00,
- 0xff, 0xff, /* Terminator (reg 0xff does not exist) */
+struct reg_val {
+ u8 reg;
+ u8 val;
+};
+static const struct reg_val global_registers[] = {
+ {0x39, 0x00},
+ {0x3a, 0xff},
+ {0x3b, 0x84},
+ {0x3c, 0x80},
+ {0x3d, 0x80},
+ {0x3e, 0x82},
+ {0x3f, 0x82},
+ {0x78, 0x00},
};
-static const u8 channel_registers[] = {
- 0x01, 0xc4,
- 0x02, 0xa5,
- 0x03, 0x20,
- 0x04, 0xd0,
- 0x05, 0x20,
- 0x06, 0xd0,
- 0x07, 0x88,
- 0x08, 0x20,
- 0x09, 0x07,
- 0x0a, 0xf0,
- 0x0b, 0x07,
- 0x0c, 0xf0,
- 0x0d, 0x40,
- 0x0e, 0xd2,
- 0x0f, 0x80,
- 0x10, 0x80,
- 0x11, 0x80,
- 0x12, 0x80,
- 0x13, 0x1f,
- 0x14, 0x00,
- 0x15, 0x00,
- 0x16, 0x00,
- 0x17, 0x00,
- 0x18, 0xff,
- 0x19, 0xff,
- 0x1a, 0xff,
- 0x1b, 0xff,
- 0x1c, 0xff,
- 0x1d, 0xff,
- 0x1e, 0xff,
- 0x1f, 0xff,
- 0x20, 0x07,
- 0x21, 0x07,
- 0x22, 0x00,
- 0x23, 0x91,
- 0x24, 0x51,
- 0x25, 0x03,
- 0x26, 0x00,
- 0x27, 0x00,
- 0x28, 0x00,
- 0x29, 0x00,
- 0x2a, 0x00,
- 0x2b, 0x00,
- 0x2c, 0x00,
- 0x2d, 0x00,
- 0x2e, 0x00,
- 0x2f, 0x00,
- 0x30, 0x00,
- 0x31, 0x00,
- 0x32, 0x00,
- 0x33, 0x00,
- 0x34, 0x00,
- 0x35, 0x00,
- 0x36, 0x00,
- 0x37, 0x00,
- 0xff, 0xff, /* Terminator (reg 0xff does not exist) */
+static const struct reg_val channel_registers[] = {
+ {0x01, 0xc4},
+ {0x02, 0xa5},
+ {0x03, 0x20},
+ {0x04, 0xd0},
+ {0x05, 0x20},
+ {0x06, 0xd0},
+ {0x07, 0x88},
+ {0x08, 0x20},
+ {0x09, 0x07},
+ {0x0a, 0xf0},
+ {0x0b, 0x07},
+ {0x0c, 0xf0},
+ {0x0d, 0x40},
+ {0x0e, 0xd2},
+ {0x0f, 0x80},
+ {0x10, 0x80},
+ {0x11, 0x80},
+ {0x12, 0x80},
+ {0x13, 0x1f},
+ {0x14, 0x00},
+ {0x15, 0x00},
+ {0x16, 0x00},
+ {0x17, 0x00},
+ {0x18, 0xff},
+ {0x19, 0xff},
+ {0x1a, 0xff},
+ {0x1b, 0xff},
+ {0x1c, 0xff},
+ {0x1d, 0xff},
+ {0x1e, 0xff},
+ {0x1f, 0xff},
+ {0x20, 0x07},
+ {0x21, 0x07},
+ {0x22, 0x00},
+ {0x23, 0x91},
+ {0x24, 0x51},
+ {0x25, 0x03},
+ {0x26, 0x00},
+ {0x27, 0x00},
+ {0x28, 0x00},
+ {0x29, 0x00},
+ {0x2a, 0x00},
+ {0x2b, 0x00},
+ {0x2c, 0x00},
+ {0x2d, 0x00},
+ {0x2e, 0x00},
+ {0x2f, 0x00},
+ {0x30, 0x00},
+ {0x31, 0x00},
+ {0x32, 0x00},
+ {0x33, 0x00},
+ {0x34, 0x00},
+ {0x35, 0x00},
+ {0x36, 0x00},
+ {0x37, 0x00},
};
static int write_reg(struct i2c_client *client, u8 reg, u8 value, u8 channel)
@@ -108,16 +111,17 @@ static int write_reg(struct i2c_client *client, u8 reg, u8 value, u8 channel)
return i2c_smbus_write_byte_data(client, reg | (channel << 6), value);
}
-static int write_regs(struct i2c_client *client, const u8 *regs, u8 channel)
+static int write_regs(struct i2c_client *client, const struct reg_val *rv,
+ int len, u8 channel)
{
int ret;
- int i;
- for (i = 0; regs[i] != 0xff; i += 2) {
+ while (--len >= 0) {
ret = i2c_smbus_write_byte_data(client,
- regs[i] | (channel << 6), regs[i + 1]);
+ rv->reg | (channel << 6), rv->val);
if (ret < 0)
return ret;
+ rv++;
}
return 0;
}
@@ -252,21 +256,20 @@ static int tw2804_s_std(struct v4l2_subdev *sd, v4l2_std_id norm)
struct tw2804 *dec = to_state(sd);
struct i2c_client *client = v4l2_get_subdevdata(sd);
bool is_60hz = norm & V4L2_STD_525_60;
- u8 regs[] = {
- 0x01, is_60hz ? 0xc4 : 0x84,
- 0x09, is_60hz ? 0x07 : 0x04,
- 0x0a, is_60hz ? 0xf0 : 0x20,
- 0x0b, is_60hz ? 0x07 : 0x04,
- 0x0c, is_60hz ? 0xf0 : 0x20,
- 0x0d, is_60hz ? 0x40 : 0x4a,
- 0x16, is_60hz ? 0x00 : 0x40,
- 0x17, is_60hz ? 0x00 : 0x40,
- 0x20, is_60hz ? 0x07 : 0x0f,
- 0x21, is_60hz ? 0x07 : 0x0f,
- 0xff, 0xff,
+ struct reg_val regs[] = {
+ {0x01, is_60hz ? 0xc4 : 0x84},
+ {0x09, is_60hz ? 0x07 : 0x04},
+ {0x0a, is_60hz ? 0xf0 : 0x20},
+ {0x0b, is_60hz ? 0x07 : 0x04},
+ {0x0c, is_60hz ? 0xf0 : 0x20},
+ {0x0d, is_60hz ? 0x40 : 0x4a},
+ {0x16, is_60hz ? 0x00 : 0x40},
+ {0x17, is_60hz ? 0x00 : 0x40},
+ {0x20, is_60hz ? 0x07 : 0x0f},
+ {0x21, is_60hz ? 0x07 : 0x0f},
};
- write_regs(client, regs, dec->channel);
+ write_regs(client, regs, ARRAY_SIZE(regs), dec->channel);
dec->norm = norm;
return 0;
}
@@ -288,12 +291,14 @@ static int tw2804_s_video_routing(struct v4l2_subdev *sd, u32 input, u32 output,
dev_dbg(&client->dev, "initializing TW2804 channel %d\n",
dec->channel);
if (dec->channel == 0 &&
- write_regs(client, global_registers, 0) < 0) {
+ write_regs(client, global_registers,
+ ARRAY_SIZE(global_registers), 0) < 0) {
dev_err(&client->dev,
"error initializing TW2804 global registers\n");
return -EIO;
}
- if (write_regs(client, channel_registers, dec->channel) < 0) {
+ if (write_regs(client, channel_registers,
+ ARRAY_SIZE(channel_registers), dec->channel) < 0) {
dev_err(&client->dev,
"error initializing TW2804 channel %d\n",
dec->channel);
--
2.30.2
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