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4b68f05e4d
Due to the 80-cols restrictions, and latter due to checkpatch
warnings, several strings were broken into multiple lines. This
is not considered a good practice anymore, as it makes harder
to grep for strings at the source code.
As we're right now fixing other drivers due to KERN_CONT, we need
to be able to identify what printk strings don't end with a "\n".
It is a way easier to detect those if we don't break long lines.
So, join those continuation lines.
The patch was generated via the script below, and manually
adjusted if needed.
</script>
use Text::Tabs;
while (<>) {
if ($next ne "") {
$c=$_;
if ($c =~ /^\s+\"(.*)/) {
$c2=$1;
$next =~ s/\"\n$//;
$n = expand($next);
$funpos = index($n, '(');
$pos = index($c2, '",');
if ($funpos && $pos > 0) {
$s1 = substr $c2, 0, $pos + 2;
$s2 = ' ' x ($funpos + 1) . substr $c2, $pos + 2;
$s2 =~ s/^\s+//;
$s2 = ' ' x ($funpos + 1) . $s2 if ($s2 ne "");
print unexpand("$next$s1\n");
print unexpand("$s2\n") if ($s2 ne "");
} else {
print "$next$c2\n";
}
$next="";
next;
} else {
print $next;
}
$next="";
} else {
if (m/\"$/) {
if (!m/\\n\"$/) {
$next=$_;
next;
}
}
}
print $_;
}
</script>
Acked-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
301 lines
6.4 KiB
C
301 lines
6.4 KiB
C
/*
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* drivers/media/i2c/smiapp/smiapp-regs.c
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*
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* Generic driver for SMIA/SMIA++ compliant camera modules
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*
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* Copyright (C) 2011--2012 Nokia Corporation
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* Contact: Sakari Ailus <sakari.ailus@iki.fi>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* version 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*/
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#include <linux/delay.h>
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#include <linux/i2c.h>
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#include "smiapp.h"
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#include "smiapp-regs.h"
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static uint32_t float_to_u32_mul_1000000(struct i2c_client *client,
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uint32_t phloat)
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{
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int32_t exp;
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uint64_t man;
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if (phloat >= 0x80000000) {
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dev_err(&client->dev, "this is a negative number\n");
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return 0;
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}
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if (phloat == 0x7f800000)
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return ~0; /* Inf. */
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if ((phloat & 0x7f800000) == 0x7f800000) {
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dev_err(&client->dev, "NaN or other special number\n");
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return 0;
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}
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/* Valid cases begin here */
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if (phloat == 0)
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return 0; /* Valid zero */
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if (phloat > 0x4f800000)
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return ~0; /* larger than 4294967295 */
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/*
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* Unbias exponent (note how phloat is now guaranteed to
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* have 0 in the high bit)
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*/
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exp = ((int32_t)phloat >> 23) - 127;
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/* Extract mantissa, add missing '1' bit and it's in MHz */
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man = ((phloat & 0x7fffff) | 0x800000) * 1000000ULL;
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if (exp < 0)
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man >>= -exp;
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else
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man <<= exp;
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man >>= 23; /* Remove mantissa bias */
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return man & 0xffffffff;
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}
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/*
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* Read a 8/16/32-bit i2c register. The value is returned in 'val'.
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* Returns zero if successful, or non-zero otherwise.
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*/
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static int ____smiapp_read(struct smiapp_sensor *sensor, u16 reg,
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u16 len, u32 *val)
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{
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struct i2c_client *client = v4l2_get_subdevdata(&sensor->src->sd);
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struct i2c_msg msg;
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unsigned char data[4];
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u16 offset = reg;
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int r;
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msg.addr = client->addr;
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msg.flags = 0;
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msg.len = 2;
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msg.buf = data;
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/* high byte goes out first */
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data[0] = (u8) (offset >> 8);
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data[1] = (u8) offset;
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r = i2c_transfer(client->adapter, &msg, 1);
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if (r != 1) {
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if (r >= 0)
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r = -EBUSY;
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goto err;
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}
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msg.len = len;
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msg.flags = I2C_M_RD;
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r = i2c_transfer(client->adapter, &msg, 1);
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if (r != 1) {
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if (r >= 0)
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r = -EBUSY;
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goto err;
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}
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*val = 0;
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/* high byte comes first */
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switch (len) {
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case SMIAPP_REG_32BIT:
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*val = (data[0] << 24) + (data[1] << 16) + (data[2] << 8) +
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data[3];
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break;
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case SMIAPP_REG_16BIT:
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*val = (data[0] << 8) + data[1];
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break;
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case SMIAPP_REG_8BIT:
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*val = data[0];
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break;
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default:
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BUG();
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}
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return 0;
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err:
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dev_err(&client->dev, "read from offset 0x%x error %d\n", offset, r);
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return r;
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}
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/* Read a register using 8-bit access only. */
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static int ____smiapp_read_8only(struct smiapp_sensor *sensor, u16 reg,
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u16 len, u32 *val)
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{
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unsigned int i;
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int rval;
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*val = 0;
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for (i = 0; i < len; i++) {
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u32 val8;
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rval = ____smiapp_read(sensor, reg + i, 1, &val8);
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if (rval < 0)
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return rval;
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*val |= val8 << ((len - i - 1) << 3);
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}
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return 0;
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}
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/*
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* Read a 8/16/32-bit i2c register. The value is returned in 'val'.
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* Returns zero if successful, or non-zero otherwise.
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*/
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static int __smiapp_read(struct smiapp_sensor *sensor, u32 reg, u32 *val,
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bool only8)
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{
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struct i2c_client *client = v4l2_get_subdevdata(&sensor->src->sd);
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u8 len = SMIAPP_REG_WIDTH(reg);
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int rval;
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if (len != SMIAPP_REG_8BIT && len != SMIAPP_REG_16BIT
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&& len != SMIAPP_REG_32BIT)
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return -EINVAL;
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if (len == SMIAPP_REG_8BIT || !only8)
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rval = ____smiapp_read(sensor, SMIAPP_REG_ADDR(reg), len, val);
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else
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rval = ____smiapp_read_8only(sensor, SMIAPP_REG_ADDR(reg), len,
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val);
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if (rval < 0)
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return rval;
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if (reg & SMIAPP_REG_FLAG_FLOAT)
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*val = float_to_u32_mul_1000000(client, *val);
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return 0;
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}
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int smiapp_read_no_quirk(struct smiapp_sensor *sensor, u32 reg, u32 *val)
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{
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return __smiapp_read(
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sensor, reg, val,
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smiapp_needs_quirk(sensor,
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SMIAPP_QUIRK_FLAG_8BIT_READ_ONLY));
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}
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static int smiapp_read_quirk(struct smiapp_sensor *sensor, u32 reg, u32 *val,
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bool force8)
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{
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int rval;
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*val = 0;
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rval = smiapp_call_quirk(sensor, reg_access, false, ®, val);
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if (rval == -ENOIOCTLCMD)
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return 0;
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if (rval < 0)
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return rval;
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if (force8)
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return __smiapp_read(sensor, reg, val, true);
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return smiapp_read_no_quirk(sensor, reg, val);
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}
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int smiapp_read(struct smiapp_sensor *sensor, u32 reg, u32 *val)
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{
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return smiapp_read_quirk(sensor, reg, val, false);
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}
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int smiapp_read_8only(struct smiapp_sensor *sensor, u32 reg, u32 *val)
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{
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return smiapp_read_quirk(sensor, reg, val, true);
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}
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int smiapp_write_no_quirk(struct smiapp_sensor *sensor, u32 reg, u32 val)
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{
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struct i2c_client *client = v4l2_get_subdevdata(&sensor->src->sd);
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struct i2c_msg msg;
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unsigned char data[6];
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unsigned int retries;
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u8 flags = SMIAPP_REG_FLAGS(reg);
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u8 len = SMIAPP_REG_WIDTH(reg);
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u16 offset = SMIAPP_REG_ADDR(reg);
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int r;
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if ((len != SMIAPP_REG_8BIT && len != SMIAPP_REG_16BIT &&
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len != SMIAPP_REG_32BIT) || flags)
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return -EINVAL;
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msg.addr = client->addr;
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msg.flags = 0; /* Write */
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msg.len = 2 + len;
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msg.buf = data;
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/* high byte goes out first */
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data[0] = (u8) (reg >> 8);
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data[1] = (u8) (reg & 0xff);
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switch (len) {
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case SMIAPP_REG_8BIT:
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data[2] = val;
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break;
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case SMIAPP_REG_16BIT:
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data[2] = val >> 8;
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data[3] = val;
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break;
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case SMIAPP_REG_32BIT:
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data[2] = val >> 24;
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data[3] = val >> 16;
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data[4] = val >> 8;
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data[5] = val;
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break;
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default:
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BUG();
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}
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for (retries = 0; retries < 5; retries++) {
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/*
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* Due to unknown reason sensor stops responding. This
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* loop is a temporaty solution until the root cause
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* is found.
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*/
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r = i2c_transfer(client->adapter, &msg, 1);
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if (r == 1) {
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if (retries)
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dev_err(&client->dev,
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"sensor i2c stall encountered. retries: %d\n",
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retries);
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return 0;
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}
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usleep_range(2000, 2000);
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}
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dev_err(&client->dev,
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"wrote 0x%x to offset 0x%x error %d\n", val, offset, r);
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return r;
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}
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/*
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* Write to a 8/16-bit register.
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* Returns zero if successful, or non-zero otherwise.
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*/
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int smiapp_write(struct smiapp_sensor *sensor, u32 reg, u32 val)
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{
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int rval;
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rval = smiapp_call_quirk(sensor, reg_access, true, ®, &val);
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if (rval == -ENOIOCTLCMD)
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return 0;
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if (rval < 0)
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return rval;
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return smiapp_write_no_quirk(sensor, reg, val);
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}
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