diff options
author | Hans de Goede <hdegoede@redhat.com> | 2022-12-04 16:48:49 +0100 |
---|---|---|
committer | Mauro Carvalho Chehab <mchehab@kernel.org> | 2023-02-08 08:23:50 +0100 |
commit | 65b3974173a7ffede971456de064cec3e9368135 (patch) | |
tree | ec675ed24e25feb325253593b94a104d00dec200 /include/media | |
parent | c47060369f9cf6724af70945aef4ee3907a4a5ce (diff) |
media: core: add ov_16bit_addr_reg_helpers.h
The following drivers under drivers/media/i2c: ov08x40.c, ov13858.c,
ov13b10.c, ov2680.c, ov2685.c, ov2740.c, ov4689.c, ov5670.c,
ov5675.c, ov5695.c, ov8856.c, ov9282.c and ov9734.c,
as well as various "atomisp" sensor drivers in drivers/staging, *all*
use register access helpers with the following function prototypes:
int ovxxxx_read_reg(struct ovxxxx_dev *sensor, u16 reg,
unsigned int len, u32 *val);
int ovxxxx_write_reg(struct ovxxxx_dev *sensor, u16 reg,
unsigned int len, u32 val);
To read/write registers on Omnivision OVxxxx image sensors wich expect
a 16 bit register address in big-endian format and which have 1-3 byte
wide registers, in big-endian format (for the higher width registers).
Add a new ov_16bit_addr_reg_helpers.h header file with static inline
versions of these register access helpers, so that this code duplication
can be removed.
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>
Diffstat (limited to 'include/media')
-rw-r--r-- | include/media/ov_16bit_addr_reg_helpers.h | 92 |
1 files changed, 92 insertions, 0 deletions
diff --git a/include/media/ov_16bit_addr_reg_helpers.h b/include/media/ov_16bit_addr_reg_helpers.h new file mode 100644 index 000000000000..1c60a50bd795 --- /dev/null +++ b/include/media/ov_16bit_addr_reg_helpers.h @@ -0,0 +1,92 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * I2C register access helpers for Omnivision OVxxxx image sensors which expect + * a 16 bit register address in big-endian format and which have 1-3 byte + * wide registers, in big-endian format (for the higher width registers). + * + * Based on the register helpers from drivers/media/i2c/ov2680.c which is: + * Copyright (C) 2018 Linaro Ltd + */ +#ifndef __OV_16BIT_ADDR_REG_HELPERS_H +#define __OV_16BIT_ADDR_REG_HELPERS_H + +#include <asm/unaligned.h> +#include <linux/dev_printk.h> +#include <linux/i2c.h> + +static inline int ov_read_reg(struct i2c_client *client, u16 reg, + unsigned int len, u32 *val) +{ + u8 addr_buf[2], data_buf[4] = { }; + struct i2c_msg msgs[2]; + int ret; + + if (len > 4) + return -EINVAL; + + put_unaligned_be16(reg, addr_buf); + + msgs[0].addr = client->addr; + msgs[0].flags = 0; + msgs[0].len = ARRAY_SIZE(addr_buf); + msgs[0].buf = addr_buf; + + msgs[1].addr = client->addr; + msgs[1].flags = I2C_M_RD; + msgs[1].len = len; + msgs[1].buf = &data_buf[4 - len]; + + ret = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs)); + if (ret != ARRAY_SIZE(msgs)) { + dev_err(&client->dev, "read error: reg=0x%4x: %d\n", reg, ret); + return -EIO; + } + + *val = get_unaligned_be32(data_buf); + + return 0; +} + +#define ov_read_reg8(s, r, v) ov_read_reg(s, r, 1, v) +#define ov_read_reg16(s, r, v) ov_read_reg(s, r, 2, v) +#define ov_read_reg24(s, r, v) ov_read_reg(s, r, 3, v) + +static inline int ov_write_reg(struct i2c_client *client, u16 reg, + unsigned int len, u32 val) +{ + u8 buf[6]; + int ret; + + if (len > 4) + return -EINVAL; + + put_unaligned_be16(reg, buf); + put_unaligned_be32(val << (8 * (4 - len)), buf + 2); + ret = i2c_master_send(client, buf, len + 2); + if (ret != len + 2) { + dev_err(&client->dev, "write error: reg=0x%4x: %d\n", reg, ret); + return -EIO; + } + + return 0; +} + +#define ov_write_reg8(s, r, v) ov_write_reg(s, r, 1, v) +#define ov_write_reg16(s, r, v) ov_write_reg(s, r, 2, v) +#define ov_write_reg24(s, r, v) ov_write_reg(s, r, 3, v) + +static inline int ov_update_reg(struct i2c_client *client, u16 reg, u8 mask, u8 val) +{ + u32 readval; + int ret; + + ret = ov_read_reg8(client, reg, &readval); + if (ret < 0) + return ret; + + val = (readval & ~mask) | (val & mask); + + return ov_write_reg8(client, reg, val); +} + +#endif |