summaryrefslogtreecommitdiffstats
path: root/drivers/media/video/smiapp/smiapp-regs.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/media/video/smiapp/smiapp-regs.c')
-rw-r--r--drivers/media/video/smiapp/smiapp-regs.c273
1 files changed, 0 insertions, 273 deletions
diff --git a/drivers/media/video/smiapp/smiapp-regs.c b/drivers/media/video/smiapp/smiapp-regs.c
deleted file mode 100644
index b1812b17a40..00000000000
--- a/drivers/media/video/smiapp/smiapp-regs.c
+++ /dev/null
@@ -1,273 +0,0 @@
-/*
- * drivers/media/video/smiapp/smiapp-regs.c
- *
- * Generic driver for SMIA/SMIA++ compliant camera modules
- *
- * Copyright (C) 2011--2012 Nokia Corporation
- * Contact: Sakari Ailus <sakari.ailus@maxwell.research.nokia.com>
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * version 2 as published by the Free Software Foundation.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
- * 02110-1301 USA
- *
- */
-
-#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[4];
- u16 offset = reg;
- int r;
-
- msg.addr = client->addr;
- msg.flags = 0;
- msg.len = 2;
- msg.buf = data;
-
- /* high byte goes out first */
- data[0] = (u8) (offset >> 8);
- data[1] = (u8) offset;
- 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;
- r = i2c_transfer(client->adapter, &msg, 1);
- if (r != 1) {
- if (r >= 0)
- r = -EBUSY;
- goto err;
- }
-
- *val = 0;
- /* high byte comes first */
- switch (len) {
- case SMIA_REG_32BIT:
- *val = (data[0] << 24) + (data[1] << 16) + (data[2] << 8) +
- data[3];
- break;
- case SMIA_REG_16BIT:
- *val = (data[0] << 8) + data[1];
- break;
- case SMIA_REG_8BIT:
- *val = data[0];
- break;
- default:
- BUG();
- }
-
- return 0;
-
-err:
- dev_err(&client->dev, "read from offset 0x%x error %d\n", offset, 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);
- unsigned int len = (u8)(reg >> 16);
- int rval;
-
- if (len != SMIA_REG_8BIT && len != SMIA_REG_16BIT
- && len != SMIA_REG_32BIT)
- return -EINVAL;
-
- if (smiapp_quirk_reg(sensor, reg, val))
- goto found_quirk;
-
- if (len == SMIA_REG_8BIT && !only8)
- rval = ____smiapp_read(sensor, (u16)reg, len, val);
- else
- rval = ____smiapp_read_8only(sensor, (u16)reg, len, val);
- if (rval < 0)
- return rval;
-
-found_quirk:
- if (reg & SMIA_REG_FLAG_FLOAT)
- *val = float_to_u32_mul_1000000(client, *val);
-
- return 0;
-}
-
-int smiapp_read(struct smiapp_sensor *sensor, u32 reg, u32 *val)
-{
- return __smiapp_read(
- sensor, reg, val,
- smiapp_needs_quirk(sensor,
- SMIAPP_QUIRK_FLAG_8BIT_READ_ONLY));
-}
-
-int smiapp_read_8only(struct smiapp_sensor *sensor, u32 reg, u32 *val)
-{
- return __smiapp_read(sensor, reg, val, true);
-}
-
-/*
- * 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)
-{
- struct i2c_client *client = v4l2_get_subdevdata(&sensor->src->sd);
- struct i2c_msg msg;
- unsigned char data[6];
- unsigned int retries;
- unsigned int flags = reg >> 24;
- unsigned int len = (u8)(reg >> 16);
- u16 offset = reg;
- int r;
-
- if ((len != SMIA_REG_8BIT && len != SMIA_REG_16BIT &&
- len != SMIA_REG_32BIT) || flags)
- return -EINVAL;
-
- msg.addr = client->addr;
- msg.flags = 0; /* Write */
- msg.len = 2 + len;
- msg.buf = data;
-
- /* high byte goes out first */
- data[0] = (u8) (reg >> 8);
- data[1] = (u8) (reg & 0xff);
-
- switch (len) {
- case SMIA_REG_8BIT:
- data[2] = val;
- break;
- case SMIA_REG_16BIT:
- data[2] = val >> 8;
- data[3] = val;
- break;
- case SMIA_REG_32BIT:
- data[2] = val >> 24;
- data[3] = val >> 16;
- data[4] = val >> 8;
- data[5] = val;
- break;
- default:
- BUG();
- }
-
- 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, offset, r);
-
- return r;
-}
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2024-11-17 18:06:43 +0000