93 lines
2.2 KiB
C
93 lines
2.2 KiB
C
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/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* I2C register access helpers for Omnivision OVxxxx image sensors which expect
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* a 16 bit register address in big-endian format and which have 1-3 byte
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* wide registers, in big-endian format (for the higher width registers).
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*
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* Based on the register helpers from drivers/media/i2c/ov2680.c which is:
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* Copyright (C) 2018 Linaro Ltd
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*/
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#ifndef __OV_16BIT_ADDR_REG_HELPERS_H
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#define __OV_16BIT_ADDR_REG_HELPERS_H
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#include <asm/unaligned.h>
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#include <linux/dev_printk.h>
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#include <linux/i2c.h>
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static inline int ov_read_reg(struct i2c_client *client, u16 reg,
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unsigned int len, u32 *val)
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{
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u8 addr_buf[2], data_buf[4] = { };
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struct i2c_msg msgs[2];
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int ret;
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if (len > 4)
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return -EINVAL;
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put_unaligned_be16(reg, addr_buf);
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msgs[0].addr = client->addr;
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msgs[0].flags = 0;
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msgs[0].len = ARRAY_SIZE(addr_buf);
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msgs[0].buf = addr_buf;
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msgs[1].addr = client->addr;
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msgs[1].flags = I2C_M_RD;
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msgs[1].len = len;
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msgs[1].buf = &data_buf[4 - len];
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ret = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs));
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if (ret != ARRAY_SIZE(msgs)) {
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dev_err(&client->dev, "read error: reg=0x%4x: %d\n", reg, ret);
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return -EIO;
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}
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*val = get_unaligned_be32(data_buf);
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return 0;
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}
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#define ov_read_reg8(s, r, v) ov_read_reg(s, r, 1, v)
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#define ov_read_reg16(s, r, v) ov_read_reg(s, r, 2, v)
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#define ov_read_reg24(s, r, v) ov_read_reg(s, r, 3, v)
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static inline int ov_write_reg(struct i2c_client *client, u16 reg,
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unsigned int len, u32 val)
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{
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u8 buf[6];
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int ret;
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if (len > 4)
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return -EINVAL;
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put_unaligned_be16(reg, buf);
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put_unaligned_be32(val << (8 * (4 - len)), buf + 2);
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ret = i2c_master_send(client, buf, len + 2);
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if (ret != len + 2) {
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dev_err(&client->dev, "write error: reg=0x%4x: %d\n", reg, ret);
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return -EIO;
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}
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return 0;
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}
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#define ov_write_reg8(s, r, v) ov_write_reg(s, r, 1, v)
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#define ov_write_reg16(s, r, v) ov_write_reg(s, r, 2, v)
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#define ov_write_reg24(s, r, v) ov_write_reg(s, r, 3, v)
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static inline int ov_update_reg(struct i2c_client *client, u16 reg, u8 mask, u8 val)
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{
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u32 readval;
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int ret;
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ret = ov_read_reg8(client, reg, &readval);
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if (ret < 0)
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return ret;
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val = (readval & ~mask) | (val & mask);
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return ov_write_reg8(client, reg, val);
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}
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#endif
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