diff options
Diffstat (limited to 'drivers/media/i2c/smiapp/smiapp-regs.c')
| -rw-r--r-- | drivers/media/i2c/smiapp/smiapp-regs.c | 261 |
1 files changed, 0 insertions, 261 deletions
diff --git a/drivers/media/i2c/smiapp/smiapp-regs.c b/drivers/media/i2c/smiapp/smiapp-regs.c deleted file mode 100644 index 1b58b7c6c839..000000000000 --- a/drivers/media/i2c/smiapp/smiapp-regs.c +++ /dev/null @@ -1,261 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0-only -/* - * drivers/media/i2c/smiapp/smiapp-regs.c - * - * Generic driver for SMIA/SMIA++ compliant camera modules - * - * Copyright (C) 2011--2012 Nokia Corporation - * Contact: Sakari Ailus <sakari.ailus@iki.fi> - */ - -#include <asm/unaligned.h> - -#include <linux/delay.h> -#include <linux/i2c.h> - -#include "smiapp.h" -#include "smiapp-regs.h" - -static uint32_t float_to_u32_mul_1000000(struct i2c_client *client, - uint32_t phloat) -{ - int32_t exp; - uint64_t man; - - if (phloat >= 0x80000000) { - dev_err(&client->dev, "this is a negative number\n"); - return 0; - } - - if (phloat == 0x7f800000) - return ~0; /* Inf. */ - - if ((phloat & 0x7f800000) == 0x7f800000) { - dev_err(&client->dev, "NaN or other special number\n"); - return 0; - } - - /* Valid cases begin here */ - if (phloat == 0) - return 0; /* Valid zero */ - - if (phloat > 0x4f800000) - return ~0; /* larger than 4294967295 */ - - /* - * Unbias exponent (note how phloat is now guaranteed to - * have 0 in the high bit) - */ - exp = ((int32_t)phloat >> 23) - 127; - - /* Extract mantissa, add missing '1' bit and it's in MHz */ - man = ((phloat & 0x7fffff) | 0x800000) * 1000000ULL; - - if (exp < 0) - man >>= -exp; - else - man <<= exp; - - man >>= 23; /* Remove mantissa bias */ - - return man & 0xffffffff; -} - - -/* - * Read a 8/16/32-bit i2c register. The value is returned in 'val'. - * Returns zero if successful, or non-zero otherwise. - */ -static int ____smiapp_read(struct smiapp_sensor *sensor, u16 reg, - u16 len, u32 *val) -{ - struct i2c_client *client = v4l2_get_subdevdata(&sensor->src->sd); - struct i2c_msg msg; - unsigned char data_buf[sizeof(u32)] = { 0 }; - unsigned char offset_buf[sizeof(u16)]; - int r; - - if (len > sizeof(data_buf)) - return -EINVAL; - - msg.addr = client->addr; - msg.flags = 0; - msg.len = sizeof(offset_buf); - msg.buf = offset_buf; - put_unaligned_be16(reg, offset_buf); - - r = i2c_transfer(client->adapter, &msg, 1); - if (r != 1) { - if (r >= 0) - r = -EBUSY; - goto err; - } - - msg.len = len; - msg.flags = I2C_M_RD; - msg.buf = &data_buf[sizeof(data_buf) - len]; - - r = i2c_transfer(client->adapter, &msg, 1); - if (r != 1) { - if (r >= 0) - r = -EBUSY; - goto err; - } - - *val = get_unaligned_be32(data_buf); - - return 0; - -err: - dev_err(&client->dev, "read from offset 0x%x error %d\n", reg, r); - - return r; -} - -/* Read a register using 8-bit access only. */ -static int ____smiapp_read_8only(struct smiapp_sensor *sensor, u16 reg, - u16 len, u32 *val) -{ - unsigned int i; - int rval; - - *val = 0; - - for (i = 0; i < len; i++) { - u32 val8; - - rval = ____smiapp_read(sensor, reg + i, 1, &val8); - if (rval < 0) - return rval; - *val |= val8 << ((len - i - 1) << 3); - } - - return 0; -} - -/* - * Read a 8/16/32-bit i2c register. The value is returned in 'val'. - * Returns zero if successful, or non-zero otherwise. - */ -static int __smiapp_read(struct smiapp_sensor *sensor, u32 reg, u32 *val, - bool only8) -{ - struct i2c_client *client = v4l2_get_subdevdata(&sensor->src->sd); - u8 len = SMIAPP_REG_WIDTH(reg); - int rval; - - if (len != SMIAPP_REG_8BIT && len != SMIAPP_REG_16BIT - && len != SMIAPP_REG_32BIT) - return -EINVAL; - - if (!only8) - rval = ____smiapp_read(sensor, SMIAPP_REG_ADDR(reg), len, val); - else - rval = ____smiapp_read_8only(sensor, SMIAPP_REG_ADDR(reg), len, - val); - if (rval < 0) - return rval; - - if (reg & SMIAPP_REG_FLAG_FLOAT) - *val = float_to_u32_mul_1000000(client, *val); - - return 0; -} - -int smiapp_read_no_quirk(struct smiapp_sensor *sensor, u32 reg, u32 *val) -{ - return __smiapp_read( - sensor, reg, val, - smiapp_needs_quirk(sensor, - SMIAPP_QUIRK_FLAG_8BIT_READ_ONLY)); -} - -static int smiapp_read_quirk(struct smiapp_sensor *sensor, u32 reg, u32 *val, - bool force8) -{ - int rval; - - *val = 0; - rval = smiapp_call_quirk(sensor, reg_access, false, ®, val); - if (rval == -ENOIOCTLCMD) - return 0; - if (rval < 0) - return rval; - - if (force8) - return __smiapp_read(sensor, reg, val, true); - - return smiapp_read_no_quirk(sensor, reg, val); -} - -int smiapp_read(struct smiapp_sensor *sensor, u32 reg, u32 *val) -{ - return smiapp_read_quirk(sensor, reg, val, false); -} - -int smiapp_read_8only(struct smiapp_sensor *sensor, u32 reg, u32 *val) -{ - return smiapp_read_quirk(sensor, reg, val, true); -} - -int smiapp_write_no_quirk(struct smiapp_sensor *sensor, u32 reg, u32 val) -{ - struct i2c_client *client = v4l2_get_subdevdata(&sensor->src->sd); - struct i2c_msg msg; - unsigned char data[6]; - unsigned int retries; - u8 len = SMIAPP_REG_WIDTH(reg); - int r; - - if (len > sizeof(data) - 2) - return -EINVAL; - - msg.addr = client->addr; - msg.flags = 0; /* Write */ - msg.len = 2 + len; - msg.buf = data; - - put_unaligned_be16(SMIAPP_REG_ADDR(reg), data); - put_unaligned_be32(val << (8 * (sizeof(val) - len)), data + 2); - - for (retries = 0; retries < 5; retries++) { - /* - * Due to unknown reason sensor stops responding. This - * loop is a temporaty solution until the root cause - * is found. - */ - r = i2c_transfer(client->adapter, &msg, 1); - if (r == 1) { - if (retries) - dev_err(&client->dev, - "sensor i2c stall encountered. retries: %d\n", - retries); - return 0; - } - - usleep_range(2000, 2000); - } - - dev_err(&client->dev, - "wrote 0x%x to offset 0x%x error %d\n", val, - SMIAPP_REG_ADDR(reg), r); - - return r; -} - -/* - * Write to a 8/16-bit register. - * Returns zero if successful, or non-zero otherwise. - */ -int smiapp_write(struct smiapp_sensor *sensor, u32 reg, u32 val) -{ - int rval; - - rval = smiapp_call_quirk(sensor, reg_access, true, ®, &val); - if (rval == -ENOIOCTLCMD) - return 0; - if (rval < 0) - return rval; - - return smiapp_write_no_quirk(sensor, reg, val); -} |