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counter: Simplify the count_read and count_write callbacks 

The count_read and count_write callbacks are simplified to pass val as
unsigned long rather than as an opaque data structure. The opaque
counter_count_read_value and counter_count_write_value structures,
counter_count_value_type enum, and relevant counter_count_read_value_set
and counter_count_write_value_get functions, are removed as they are no
longer used.

Cc: Patrick Havelange <patrick.havelange@essensium.com>
Acked-by: Fabrice Gasnier <fabrice.gasnier@st.com>
Acked-by: David Lechner <david@lechnology.com>
Signed-off-by: William Breathitt Gray <vilhelm.gray@gmail.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
William Breathitt Gray 2019-10-06 16:03:09 -04:00 committed by Jonathan Cameron
parent 16922ffee1
commit d49e6ee2d6
7 changed files with 51 additions and 212 deletions
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33
drivers/counter/104-quad-8.c
View File

@ -562,11 +562,10 @@ static const struct iio_chan_spec quad8_channels[] = {
};
static int quad8_signal_read(struct counter_device *counter,
struct counter_signal *signal, struct counter_signal_read_value *val)
struct counter_signal *signal, enum counter_signal_value *val)
{
const struct quad8_iio *const priv = counter->priv;
unsigned int state;
enum counter_signal_level level;
/* Only Index signal levels can be read */
if (signal->id < 16)
@ -575,22 +574,19 @@ static int quad8_signal_read(struct counter_device *counter,
state = inb(priv->base + QUAD8_REG_INDEX_INPUT_LEVELS)
& BIT(signal->id - 16);
level = (state) ? COUNTER_SIGNAL_LEVEL_HIGH : COUNTER_SIGNAL_LEVEL_LOW;
counter_signal_read_value_set(val, COUNTER_SIGNAL_LEVEL, &level);
*val = (state) ? COUNTER_SIGNAL_HIGH : COUNTER_SIGNAL_LOW;
return 0;
}
static int quad8_count_read(struct counter_device *counter,
struct counter_count *count, struct counter_count_read_value *val)
struct counter_count *count, unsigned long *val)
{
const struct quad8_iio *const priv = counter->priv;
const int base_offset = priv->base + 2 * count->id;
unsigned int flags;
unsigned int borrow;
unsigned int carry;
unsigned long position;
int i;
flags = inb(base_offset + 1);
@ -598,36 +594,27 @@ static int quad8_count_read(struct counter_device *counter,
carry = !!(flags & QUAD8_FLAG_CT);
/* Borrow XOR Carry effectively doubles count range */
position = (unsigned long)(borrow ^ carry) << 24;
*val = (unsigned long)(borrow ^ carry) << 24;
/* Reset Byte Pointer; transfer Counter to Output Latch */
outb(QUAD8_CTR_RLD | QUAD8_RLD_RESET_BP | QUAD8_RLD_CNTR_OUT,
base_offset + 1);
for (i = 0; i < 3; i++)
position |= (unsigned long)inb(base_offset) << (8 * i);
counter_count_read_value_set(val, COUNTER_COUNT_POSITION, &position);
*val |= (unsigned long)inb(base_offset) << (8 * i);
return 0;
}
static int quad8_count_write(struct counter_device *counter,
struct counter_count *count, struct counter_count_write_value *val)
struct counter_count *count, unsigned long val)
{
const struct quad8_iio *const priv = counter->priv;
const int base_offset = priv->base + 2 * count->id;
int err;
unsigned long position;
int i;
err = counter_count_write_value_get(&position, COUNTER_COUNT_POSITION,
val);
if (err)
return err;
/* Only 24-bit values are supported */
if (position > 0xFFFFFF)
if (val > 0xFFFFFF)
return -EINVAL;
/* Reset Byte Pointer */
@ -635,7 +622,7 @@ static int quad8_count_write(struct counter_device *counter,
/* Counter can only be set via Preset Register */
for (i = 0; i < 3; i++)
outb(position >> (8 * i), base_offset);
outb(val >> (8 * i), base_offset);
/* Transfer Preset Register to Counter */
outb(QUAD8_CTR_RLD | QUAD8_RLD_PRESET_CNTR, base_offset + 1);
@ -644,9 +631,9 @@ static int quad8_count_write(struct counter_device *counter,
outb(QUAD8_CTR_RLD | QUAD8_RLD_RESET_BP, base_offset + 1);
/* Set Preset Register back to original value */
position = priv->preset[count->id];
val = priv->preset[count->id];
for (i = 0; i < 3; i++)
outb(position >> (8 * i), base_offset);
outb(val >> (8 * i), base_offset);
/* Reset Borrow, Carry, Compare, and Sign flags */
outb(QUAD8_CTR_RLD | QUAD8_RLD_RESET_FLAGS, base_offset + 1);

101
drivers/counter/counter.c
View File

@ -220,86 +220,6 @@ ssize_t counter_device_enum_available_read(struct counter_device *counter,
}
EXPORT_SYMBOL_GPL(counter_device_enum_available_read);
static const char *const counter_signal_level_str[] = {
[COUNTER_SIGNAL_LEVEL_LOW] = "low",
[COUNTER_SIGNAL_LEVEL_HIGH] = "high"
};
/**
* counter_signal_read_value_set - set counter_signal_read_value data
* @val: counter_signal_read_value structure to set
* @type: property Signal data represents
* @data: Signal data
*
* This function sets an opaque counter_signal_read_value structure with the
* provided Signal data.
*/
void counter_signal_read_value_set(struct counter_signal_read_value *const val,
const enum counter_signal_value_type type,
void *const data)
{
if (type == COUNTER_SIGNAL_LEVEL)
val->len = sprintf(val->buf, "%s\n",
counter_signal_level_str[*(enum counter_signal_level *)data]);
else
val->len = 0;
}
EXPORT_SYMBOL_GPL(counter_signal_read_value_set);
/**
* counter_count_read_value_set - set counter_count_read_value data
* @val: counter_count_read_value structure to set
* @type: property Count data represents
* @data: Count data
*
* This function sets an opaque counter_count_read_value structure with the
* provided Count data.
*/
void counter_count_read_value_set(struct counter_count_read_value *const val,
const enum counter_count_value_type type,
void *const data)
{
switch (type) {
case COUNTER_COUNT_POSITION:
val->len = sprintf(val->buf, "%lu\n", *(unsigned long *)data);
break;
default:
val->len = 0;
}
}
EXPORT_SYMBOL_GPL(counter_count_read_value_set);
/**
* counter_count_write_value_get - get counter_count_write_value data
* @data: Count data
* @type: property Count data represents
* @val: counter_count_write_value structure containing data
*
* This function extracts Count data from the provided opaque
* counter_count_write_value structure and stores it at the address provided by
* @data.
*
* RETURNS:
* 0 on success, negative error number on failure.
*/
int counter_count_write_value_get(void *const data,
const enum counter_count_value_type type,
const struct counter_count_write_value *const val)
{
int err;
switch (type) {
case COUNTER_COUNT_POSITION:
err = kstrtoul(val->buf, 0, data);
if (err)
return err;
break;
}
return 0;
}
EXPORT_SYMBOL_GPL(counter_count_write_value_get);
struct counter_attr_parm {
struct counter_device_attr_group *group;
const char *prefix;
@ -369,6 +289,11 @@ struct counter_signal_unit {
struct counter_signal *signal;
};
static const char *const counter_signal_value_str[] = {
[COUNTER_SIGNAL_LOW] = "low",
[COUNTER_SIGNAL_HIGH] = "high"
};
static ssize_t counter_signal_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
@ -377,13 +302,13 @@ static ssize_t counter_signal_show(struct device *dev,
const struct counter_signal_unit *const component = devattr->component;
struct counter_signal *const signal = component->signal;
int err;
struct counter_signal_read_value val = { .buf = buf };
enum counter_signal_value val;
err = counter->ops->signal_read(counter, signal, &val);
if (err)
return err;
return val.len;
return sprintf(buf, "%s\n", counter_signal_value_str[val]);
}
struct counter_name_unit {
@ -788,13 +713,13 @@ static ssize_t counter_count_show(struct device *dev,
const struct counter_count_unit *const component = devattr->component;
struct counter_count *const count = component->count;
int err;
struct counter_count_read_value val = { .buf = buf };
unsigned long val;
err = counter->ops->count_read(counter, count, &val);
if (err)
return err;
return val.len;
return sprintf(buf, "%lu\n", val);
}
static ssize_t counter_count_store(struct device *dev,
@ -806,9 +731,13 @@ static ssize_t counter_count_store(struct device *dev,
const struct counter_count_unit *const component = devattr->component;
struct counter_count *const count = component->count;
int err;
struct counter_count_write_value val = { .buf = buf };
unsigned long val;
err = counter->ops->count_write(counter, count, &val);
err = kstrtoul(buf, 0, &val);
if (err)
return err;
err = counter->ops->count_write(counter, count, val);
if (err)
return err;

14
drivers/counter/ftm-quaddec.c
View File

@ -178,31 +178,25 @@ static const enum counter_count_function ftm_quaddec_count_functions[] = {
static int ftm_quaddec_count_read(struct counter_device *counter,
struct counter_count *count,
struct counter_count_read_value *val)
unsigned long *val)
{
struct ftm_quaddec *const ftm = counter->priv;
uint32_t cntval;
ftm_read(ftm, FTM_CNT, &cntval);
counter_count_read_value_set(val, COUNTER_COUNT_POSITION, &cntval);
*val = cntval;
return 0;
}
static int ftm_quaddec_count_write(struct counter_device *counter,
struct counter_count *count,
struct counter_count_write_value *val)
const unsigned long val)
{
struct ftm_quaddec *const ftm = counter->priv;
u32 cnt;
int err;
err = counter_count_write_value_get(&cnt, COUNTER_COUNT_POSITION, val);
if (err)
return err;
if (cnt != 0) {
if (val != 0) {
dev_warn(&ftm->pdev->dev, "Can only accept '0' as new counter value\n");
return -EINVAL;
}

5
drivers/counter/stm32-lptimer-cnt.c
View File

@ -377,8 +377,7 @@ static enum counter_synapse_action stm32_lptim_cnt_synapse_actions[] = {
};
static int stm32_lptim_cnt_read(struct counter_device *counter,
struct counter_count *count,
struct counter_count_read_value *val)
struct counter_count *count, unsigned long *val)
{
struct stm32_lptim_cnt *const priv = counter->priv;
u32 cnt;
@ -388,7 +387,7 @@ static int stm32_lptim_cnt_read(struct counter_device *counter,
if (ret)
return ret;
counter_count_read_value_set(val, COUNTER_COUNT_POSITION, &cnt);
*val = cnt;
return 0;
}

17
drivers/counter/stm32-timer-cnt.c
View File

@ -48,34 +48,27 @@ static enum counter_count_function stm32_count_functions[] = {
};
static int stm32_count_read(struct counter_device *counter,
struct counter_count *count,
struct counter_count_read_value *val)
struct counter_count *count, unsigned long *val)
{
struct stm32_timer_cnt *const priv = counter->priv;
u32 cnt;
regmap_read(priv->regmap, TIM_CNT, &cnt);
counter_count_read_value_set(val, COUNTER_COUNT_POSITION, &cnt);
*val = cnt;
return 0;
}
static int stm32_count_write(struct counter_device *counter,
struct counter_count *count,
struct counter_count_write_value *val)
const unsigned long val)
{
struct stm32_timer_cnt *const priv = counter->priv;
u32 cnt;
int err;
err = counter_count_write_value_get(&cnt, COUNTER_COUNT_POSITION, val);
if (err)
return err;
if (cnt > priv->ceiling)
if (val > priv->ceiling)
return -EINVAL;
return regmap_write(priv->regmap, TIM_CNT, cnt);
return regmap_write(priv->regmap, TIM_CNT, val);
}
static int stm32_count_function_get(struct counter_device *counter,

19
drivers/counter/ti-eqep.c
View File

@ -93,35 +93,28 @@ struct ti_eqep_cnt {
};
static int ti_eqep_count_read(struct counter_device *counter,
struct counter_count *count,
struct counter_count_read_value *val)
struct counter_count *count, unsigned long *val)
{
struct ti_eqep_cnt *priv = counter->priv;
u32 cnt;
regmap_read(priv->regmap32, QPOSCNT, &cnt);
counter_count_read_value_set(val, COUNTER_COUNT_POSITION, &cnt);
*val = cnt;
return 0;
}
static int ti_eqep_count_write(struct counter_device *counter,
struct counter_count *count,
struct counter_count_write_value *val)
struct counter_count *count, unsigned long val)
{
struct ti_eqep_cnt *priv = counter->priv;
u32 cnt, max;
int err;
err = counter_count_write_value_get(&cnt, COUNTER_COUNT_POSITION, val);
if (err)
return err;
u32 max;
regmap_read(priv->regmap32, QPOSMAX, &max);
if (cnt > max)
if (val > max)
return -EINVAL;
return regmap_write(priv->regmap32, QPOSCNT, cnt);
return regmap_write(priv->regmap32, QPOSCNT, val);
}
static int ti_eqep_function_get(struct counter_device *counter,

74
include/linux/counter.h
View File

@ -290,53 +290,22 @@ struct counter_device_state {
const struct attribute_group **groups;
};
/**
* struct counter_signal_read_value - Opaque Signal read value
* @buf: string representation of Signal read value
* @len: length of string in @buf
*/
struct counter_signal_read_value {
char *buf;
size_t len;
};
/**
* struct counter_count_read_value - Opaque Count read value
* @buf: string representation of Count read value
* @len: length of string in @buf
*/
struct counter_count_read_value {
char *buf;
size_t len;
};
/**
* struct counter_count_write_value - Opaque Count write value
* @buf: string representation of Count write value
*/
struct counter_count_write_value {
const char *buf;
enum counter_signal_value {
COUNTER_SIGNAL_LOW = 0,
COUNTER_SIGNAL_HIGH
};
/**
* struct counter_ops - Callbacks from driver
* @signal_read: optional read callback for Signal attribute. The read
* value of the respective Signal should be passed back via
* the val parameter. val points to an opaque type which
* should be set only by calling the
* counter_signal_read_value_set function from within the
* signal_read callback.
* the val parameter.
* @count_read: optional read callback for Count attribute. The read
* value of the respective Count should be passed back via
* the val parameter. val points to an opaque type which
* should be set only by calling the
* counter_count_read_value_set function from within the
* count_read callback.
* the val parameter.
* @count_write: optional write callback for Count attribute. The write
* value for the respective Count is passed in via the val
* parameter. val points to an opaque type which should be
* accessed only by calling the
* counter_count_write_value_get function.
* parameter.
* @function_get: function to get the current count function mode. Returns
* 0 on success and negative error code on error. The index
* of the respective Count's returned function mode should
@ -355,13 +324,11 @@ struct counter_count_write_value {
struct counter_ops {
int (*signal_read)(struct counter_device *counter,
struct counter_signal *signal,
struct counter_signal_read_value *val);
enum counter_signal_value *val);
int (*count_read)(struct counter_device *counter,
struct counter_count *count,
struct counter_count_read_value *val);
struct counter_count *count, unsigned long *val);
int (*count_write)(struct counter_device *counter,
struct counter_count *count,
struct counter_count_write_value *val);
struct counter_count *count, unsigned long val);
int (*function_get)(struct counter_device *counter,
struct counter_count *count, size_t *function);
int (*function_set)(struct counter_device *counter,
@ -477,29 +444,6 @@ struct counter_device {
void *priv;
};
enum counter_signal_level {
COUNTER_SIGNAL_LEVEL_LOW = 0,
COUNTER_SIGNAL_LEVEL_HIGH
};
enum counter_signal_value_type {
COUNTER_SIGNAL_LEVEL = 0
};
enum counter_count_value_type {
COUNTER_COUNT_POSITION = 0,
};
void counter_signal_read_value_set(struct counter_signal_read_value *const val,
const enum counter_signal_value_type type,
void *const data);
void counter_count_read_value_set(struct counter_count_read_value *const val,
const enum counter_count_value_type type,
void *const data);
int counter_count_write_value_get(void *const data,
const enum counter_count_value_type type,
const struct counter_count_write_value *const val);
int counter_register(struct counter_device *const counter);
void counter_unregister(struct counter_device *const counter);
int devm_counter_register(struct device *dev,