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|
/*
* Copyright 2008-2009 Freescale Semiconductor, Inc. All Rights Reserved.
*/
/*
* The code contained herein is licensed under the GNU General Public
* License. You may obtain a copy of the GNU General Public License
* Version 2 or later at the following locations:
*
* http://www.opensource.org/licenses/gpl-license.html
* http://www.gnu.org/copyleft/gpl.html
*/
#include <linux/io.h>
#include <linux/videodev2.h>
#include <media/v4l2-common.h>
#include <linux/i2c.h>
#include <linux/delay.h>
#include <linux/version.h> /* for KERNEL_VERSION MACRO */
#include "stfm1000.h"
#define stfm1000_i2c_debug(p, fmt, arg...) \
do { \
if ((p)->dbgflg & STFM1000_DBGFLG_I2C) \
printk(KERN_INFO "stfm1000: " fmt, ##arg); \
} while (0)
static const char *reg_names[STFM1000_NUM_REGS] = {
#undef REGNAME
#define REGNAME(x) \
[STFM1000_ ## x / 4] = #x ""
REGNAME(TUNE1),
REGNAME(SDNOMINAL),
REGNAME(PILOTTRACKING),
REGNAME(INITIALIZATION1),
REGNAME(INITIALIZATION2),
REGNAME(INITIALIZATION3),
REGNAME(INITIALIZATION4),
REGNAME(INITIALIZATION5),
REGNAME(INITIALIZATION6),
REGNAME(REF),
REGNAME(LNA),
REGNAME(MIXFILT),
REGNAME(CLK1),
REGNAME(CLK2),
REGNAME(ADC),
REGNAME(AGC_CONTROL1),
REGNAME(AGC_CONTROL2),
REGNAME(DATAPATH),
REGNAME(RMS),
REGNAME(AGC_STAT),
REGNAME(SIGNALQUALITY),
REGNAME(DCEST),
REGNAME(RSSI_TONE),
REGNAME(PILOTCORRECTION),
REGNAME(ATTENTION),
REGNAME(CLK3),
REGNAME(CHIPID),
#undef REGNAME
};
static const int stfm1000_rw_regs[] = {
STFM1000_TUNE1,
STFM1000_SDNOMINAL,
STFM1000_PILOTTRACKING,
STFM1000_INITIALIZATION1,
STFM1000_INITIALIZATION2,
STFM1000_INITIALIZATION3,
STFM1000_INITIALIZATION4,
STFM1000_INITIALIZATION5,
STFM1000_INITIALIZATION6,
STFM1000_REF,
STFM1000_LNA,
STFM1000_MIXFILT,
STFM1000_CLK1,
STFM1000_CLK2,
STFM1000_ADC,
STFM1000_AGC_CONTROL1,
STFM1000_AGC_CONTROL2,
STFM1000_DATAPATH,
STFM1000_ATTENTION, /* it's both WR/RD */
};
static const int stfm1000_ra_regs[] = {
STFM1000_RMS,
STFM1000_AGC_STAT,
STFM1000_SIGNALQUALITY,
STFM1000_DCEST,
STFM1000_RSSI_TONE,
STFM1000_PILOTCORRECTION,
STFM1000_ATTENTION, /* it's both WR/RD - always read */
STFM1000_CLK3,
STFM1000_CHIPID
};
static int verify_writes;
void stfm1000_setup_reg_set(struct stfm1000 *stfm1000)
{
int i, reg;
/* set up register sets (read/write) */
for (i = 0; i < ARRAY_SIZE(stfm1000_rw_regs); i++) {
reg = stfm1000_rw_regs[i] / 4;
stfm1000->reg_rw_set[reg / 32] |= 1U << (reg & 31);
/* printk(KERN_INFO "STFM1000: rw <= %d\n", reg); */
}
/* for (i = 0; i < ARRAY_SIZE(stfm1000->reg_rw_set); i++)
printk("RW[%d] = 0x%08x\n", i, stfm1000->reg_rw_set[i]); */
/* set up register sets (read only) */
for (i = 0; i < ARRAY_SIZE(stfm1000_ra_regs); i++) {
reg = stfm1000_ra_regs[i] / 4;
stfm1000->reg_ra_set[reg / 32] |= 1U << (reg & 31);
/* printk(KERN_INFO "STFM1000: rw <= %d\n", reg); */
}
/* for (i = 0; i < ARRAY_SIZE(stfm1000->reg_ra_set); i++)
printk("RO[%d] = 0x%08x\n", i, stfm1000->reg_ra_set[i]); */
/* clear dirty */
memset(stfm1000->reg_dirty_set, 0, sizeof(stfm1000->reg_dirty_set));
}
static int stfm1000_reg_is_rw(struct stfm1000 *stfm1000, int reg)
{
reg >>= 2;
return !!(stfm1000->reg_rw_set[reg / 32] & (1 << (reg & 31)));
}
static int stfm1000_reg_is_ra(struct stfm1000 *stfm1000, int reg)
{
reg >>= 2;
return !!(stfm1000->reg_ra_set[reg / 32] & (1 << (reg & 31)));
}
static int stfm1000_reg_is_dirty(struct stfm1000 *stfm1000, int reg)
{
reg >>= 2;
return !!(stfm1000->reg_dirty_set[reg / 32] & (1 << (reg & 31)));
}
static void stfm1000_reg_set_dirty(struct stfm1000 *stfm1000, int reg)
{
reg >>= 2;
stfm1000->reg_dirty_set[reg / 32] |= 1 << (reg & 31);
}
static inline int stfm1000_reg_is_writeable(struct stfm1000 *stfm1000, int reg)
{
return stfm1000_reg_is_rw(stfm1000, reg);
}
static inline int stfm1000_reg_is_readable(struct stfm1000 *stfm1000, int reg)
{
return stfm1000_reg_is_rw(stfm1000, reg) ||
stfm1000_reg_is_ra(stfm1000, reg);
}
/********************************************************/
static int write_reg_internal(struct stfm1000 *stfm1000, int reg, u32 value)
{
u8 values[5];
int ret;
stfm1000_i2c_debug(stfm1000, "%s(%s - 0x%02x, 0x%08x)\n", __func__,
reg_names[reg / 4], reg, value);
values[0] = (u8)reg;
values[1] = (u8)value;
values[2] = (u8)(value >> 8);
values[3] = (u8)(value >> 16);
values[4] = (u8)(value >> 24);
ret = i2c_master_send(stfm1000->client, values, 5);
if (ret < 0)
return ret;
return 0;
}
static int read_reg_internal(struct stfm1000 *stfm1000, int reg, u32 *value)
{
u8 regb = reg;
u8 values[4];
int ret;
ret = i2c_master_send(stfm1000->client, ®b, 1);
if (ret < 0)
goto out;
ret = i2c_master_recv(stfm1000->client, values, 4);
if (ret < 0)
goto out;
*value = (u32)values[0] | ((u32)values[1] << 8) |
((u32)values[2] << 16) | ((u32)values[3] << 24);
ret = 0;
stfm1000_i2c_debug(stfm1000, "%s(%s - 0x%02x, 0x%08x)\n", __func__,
reg_names[reg / 4], reg, *value);
out:
return ret;
}
int stfm1000_raw_write(struct stfm1000 *stfm1000, int reg, u32 value)
{
int ret;
mutex_lock(&stfm1000->xfer_lock);
ret = write_reg_internal(stfm1000, reg, value);
mutex_unlock(&stfm1000->xfer_lock);
if (ret < 0)
dev_err(&stfm1000->client->dev, "%s: failed", __func__);
return ret;
}
int stfm1000_raw_read(struct stfm1000 *stfm1000, int reg, u32 *value)
{
int ret;
mutex_lock(&stfm1000->xfer_lock);
ret = read_reg_internal(stfm1000, reg, value);
mutex_unlock(&stfm1000->xfer_lock);
if (ret < 0)
dev_err(&stfm1000->client->dev, "%s: failed", __func__);
return ret;
}
static inline void stfm1000_set_shadow_reg(struct stfm1000 *stfm1000,
int reg, u32 val)
{
stfm1000->shadow_regs[reg / 4] = val;
}
static inline u32 stfm1000_get_shadow_reg(struct stfm1000 *stfm1000, int reg)
{
return stfm1000->shadow_regs[reg / 4];
}
int stfm1000_write(struct stfm1000 *stfm1000, int reg, u32 value)
{
int ret;
if (!stfm1000_reg_is_writeable(stfm1000, reg)) {
ret = -EINVAL;
goto out;
}
mutex_lock(&stfm1000->xfer_lock);
/* same value as last one written? */
if (stfm1000_reg_is_dirty(stfm1000, reg) &&
stfm1000_get_shadow_reg(stfm1000, reg) == value) {
ret = 0;
stfm1000_i2c_debug(stfm1000, "%s - HIT "
"(%s - 0x%02x, 0x%08x)\n", __func__,
reg_names[reg / 4], reg, value);
goto out_unlock;
}
/* actually write the register */
ret = write_reg_internal(stfm1000, reg, value);
if (ret < 0)
goto out_unlock;
/* update shadow register & mark it as dirty */
/* only if register is not read always */
if (!stfm1000_reg_is_ra(stfm1000, reg)) {
stfm1000_set_shadow_reg(stfm1000, reg, value);
stfm1000_reg_set_dirty(stfm1000, reg);
}
out_unlock:
mutex_unlock(&stfm1000->xfer_lock);
out:
if (ret < 0)
dev_err(&stfm1000->client->dev, "%s: failed", __func__);
if (verify_writes) {
u32 value2 = ~0;
stfm1000_raw_read(stfm1000, reg, &value2);
stfm1000_i2c_debug(stfm1000, "%s - VER "
"(%s - 0x%02x, W=0x%08x V=0x%08x) %s\n", __func__,
reg_names[reg / 4], reg, value, value2,
value == value2 ? "OK" : "** differs **");
}
return ret;
}
int stfm1000_read(struct stfm1000 *stfm1000, int reg, u32 *value)
{
int ret = 0;
if (!stfm1000_reg_is_readable(stfm1000, reg)) {
ret = -EINVAL;
printk(KERN_INFO "%s: !readable(%d)\n", __func__, reg);
goto out;
}
mutex_lock(&stfm1000->xfer_lock);
/* if the register can be written & is dirty, use the shadow */
if (stfm1000_reg_is_writeable(stfm1000, reg) &&
stfm1000_reg_is_dirty(stfm1000, reg)) {
*value = stfm1000_get_shadow_reg(stfm1000, reg);
ret = 0;
stfm1000_i2c_debug(stfm1000, "%s - HIT "
"(%s - 0x%02x, 0x%08x)\n", __func__,
reg_names[reg / 4], reg, *value);
goto out_unlock;
}
/* register must be read */
ret = read_reg_internal(stfm1000, reg, value);
if (ret < 0)
goto out;
/* if the register is writeable, update shadow */
if (stfm1000_reg_is_writeable(stfm1000, reg)) {
stfm1000_set_shadow_reg(stfm1000, reg, *value);
stfm1000_reg_set_dirty(stfm1000, reg);
}
out_unlock:
mutex_unlock(&stfm1000->xfer_lock);
out:
if (ret < 0)
dev_err(&stfm1000->client->dev, "%s: failed", __func__);
return ret;
}
int stfm1000_write_masked(struct stfm1000 *stfm1000, int reg, u32 value,
u32 mask)
{
int ret = 0;
u32 old_value;
if (!stfm1000_reg_is_writeable(stfm1000, reg)) {
ret = -EINVAL;
printk(KERN_ERR "%s: !writeable(%d)\n", __func__, reg);
goto out;
}
mutex_lock(&stfm1000->xfer_lock);
/* if the register wasn't written before, read it */
if (!stfm1000_reg_is_dirty(stfm1000, reg)) {
ret = read_reg_internal(stfm1000, reg, &old_value);
if (ret != 0)
goto out_unlock;
} else /* register was written, use the last value */
old_value = stfm1000_get_shadow_reg(stfm1000, reg);
/* perform masking */
value = (old_value & ~mask) | (value & mask);
/* if we write the same value, don't bother */
if (stfm1000_reg_is_dirty(stfm1000, reg) && value == old_value) {
ret = 0;
stfm1000_i2c_debug(stfm1000, "%s - HIT "
"(%s - 0x%02x, 0x%08x)\n", __func__,
reg_names[reg / 4], reg, value);
goto out_unlock;
}
/* actually write the register to the chip */
ret = write_reg_internal(stfm1000, reg, value);
if (ret < 0)
goto out_unlock;
/* if no error, update the shadow register and mark it as dirty */
stfm1000_set_shadow_reg(stfm1000, reg, value);
stfm1000_reg_set_dirty(stfm1000, reg);
out_unlock:
mutex_unlock(&stfm1000->xfer_lock);
out:
if (ret < 0)
dev_err(&stfm1000->client->dev, "%s: failed", __func__);
if (verify_writes) {
u32 value2 = ~0;
stfm1000_raw_read(stfm1000, reg, &value2);
stfm1000_i2c_debug(stfm1000, "%s - VER "
"(%s - 0x%02x, W=0x%08x V=0x%08x) %s\n", __func__,
reg_names[reg / 4], reg, value, value2,
value == value2 ? "OK" : "** differs **");
}
return ret;
}
int stfm1000_set_bits(struct stfm1000 *stfm1000, int reg, u32 value)
{
return stfm1000_write_masked(stfm1000, reg, value, value);
}
int stfm1000_clear_bits(struct stfm1000 *stfm1000, int reg, u32 value)
{
return stfm1000_write_masked(stfm1000, reg, ~value, value);
}
int stfm1000_write_regs(struct stfm1000 *stfm1000,
const struct stfm1000_reg *reg)
{
int ret;
for (; reg && reg->regno != STFM1000_REG_END; reg++) {
if (reg->regno == STFM1000_REG_DELAY) {
msleep(reg->value);
continue;
}
if (reg->regno & STFM1000_REG_SET_BITS_MASK)
ret = stfm1000_set_bits(stfm1000, reg->regno & 0xff,
reg->value);
else if (reg->regno & STFM1000_REG_CLEAR_BITS_MASK)
ret = stfm1000_clear_bits(stfm1000, reg->regno & 0xff,
reg->value);
else
ret = stfm1000_write(stfm1000, reg->regno, reg->value);
if (ret != 0) {
printk(KERN_ERR "%s: failed to write reg 0x%x "
"with 0x%08x\n",
__func__, reg->regno, reg->value);
return ret;
}
}
return 0;
}
|
