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Merge branch 'ib-array-bitmaps' into devel

This commit is contained in:
Linus Walleij 2018-09-20 08:36:36 -07:00
parent c02980d6bf b17566a6b0
commit a2ab170374
16 changed files with 399 additions and 189 deletions
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15
Documentation/driver-api/gpio/board.rst
View File

@ -193,3 +193,18 @@ And the table can be added to the board code as follows::
The line will be hogged as soon as the gpiochip is created or - in case the
chip was created earlier - when the hog table is registered.
Arrays of pins
--------------
In addition to requesting pins belonging to a function one by one, a device may
also request an array of pins assigned to the function. The way those pins are
mapped to the device determines if the array qualifies for fast bitmap
processing. If yes, a bitmap is passed over get/set array functions directly
between a caller and a respective .get/set_multiple() callback of a GPIO chip.
In order to qualify for fast bitmap processing, the pin mapping must meet the
following requirements:
- it must belong to the same chip as other 'fast' pins of the function,
- its index within the function must match its hardware number within the chip.
Open drain and open source pins are excluded from fast bitmap output processing.

46
Documentation/driver-api/gpio/consumer.rst
View File

@ -109,9 +109,11 @@ For a function using multiple GPIOs all of those can be obtained with one call::
enum gpiod_flags flags)
This function returns a struct gpio_descs which contains an array of
descriptors::
descriptors. It also contains a pointer to a gpiolib private structure which,
if passed back to get/set array functions, may speed up I/O proocessing::
struct gpio_descs {
struct gpio_array *info;
unsigned int ndescs;
struct gpio_desc *desc[];
}
@ -323,29 +325,37 @@ The following functions get or set the values of an array of GPIOs::
int gpiod_get_array_value(unsigned int array_size,
struct gpio_desc **desc_array,
int *value_array);
struct gpio_array *array_info,
unsigned long *value_bitmap);
int gpiod_get_raw_array_value(unsigned int array_size,
struct gpio_desc **desc_array,
int *value_array);
struct gpio_array *array_info,
unsigned long *value_bitmap);
int gpiod_get_array_value_cansleep(unsigned int array_size,
struct gpio_desc **desc_array,
int *value_array);
struct gpio_array *array_info,
unsigned long *value_bitmap);
int gpiod_get_raw_array_value_cansleep(unsigned int array_size,
struct gpio_desc **desc_array,
int *value_array);
struct gpio_array *array_info,
unsigned long *value_bitmap);
void gpiod_set_array_value(unsigned int array_size,
struct gpio_desc **desc_array,
int *value_array)
struct gpio_array *array_info,
unsigned long *value_bitmap)
void gpiod_set_raw_array_value(unsigned int array_size,
struct gpio_desc **desc_array,
int *value_array)
struct gpio_array *array_info,
unsigned long *value_bitmap)
void gpiod_set_array_value_cansleep(unsigned int array_size,
struct gpio_desc **desc_array,
int *value_array)
struct gpio_array *array_info,
unsigned long *value_bitmap)
void gpiod_set_raw_array_value_cansleep(unsigned int array_size,
struct gpio_desc **desc_array,
int *value_array)
struct gpio_array *array_info,
unsigned long *value_bitmap)
The array can be an arbitrary set of GPIOs. The functions will try to access
GPIOs belonging to the same bank or chip simultaneously if supported by the
@ -356,8 +366,9 @@ accessed sequentially.
The functions take three arguments:
* array_size - the number of array elements
* desc_array - an array of GPIO descriptors
* value_array - an array to store the GPIOs' values (get) or
an array of values to assign to the GPIOs (set)
* array_info - optional information obtained from gpiod_array_get()
* value_bitmap - a bitmap to store the GPIOs' values (get) or
a bitmap of values to assign to the GPIOs (set)
The descriptor array can be obtained using the gpiod_get_array() function
or one of its variants. If the group of descriptors returned by that function
@ -366,16 +377,25 @@ the struct gpio_descs returned by gpiod_get_array()::
struct gpio_descs *my_gpio_descs = gpiod_get_array(...);
gpiod_set_array_value(my_gpio_descs->ndescs, my_gpio_descs->desc,
my_gpio_values);
my_gpio_descs->info, my_gpio_value_bitmap);
It is also possible to access a completely arbitrary array of descriptors. The
descriptors may be obtained using any combination of gpiod_get() and
gpiod_get_array(). Afterwards the array of descriptors has to be setup
manually before it can be passed to one of the above functions.
manually before it can be passed to one of the above functions. In that case,
array_info should be set to NULL.
Note that for optimal performance GPIOs belonging to the same chip should be
contiguous within the array of descriptors.
Still better performance may be achieved if array indexes of the descriptors
match hardware pin numbers of a single chip. If an array passed to a get/set
array function matches the one obtained from gpiod_get_array() and array_info
associated with the array is also passed, the function may take a fast bitmap
processing path, passing the value_bitmap argument directly to the respective
.get/set_multiple() callback of the chip. That allows for utilization of GPIO
banks as data I/O ports without much loss of performance.
The return value of gpiod_get_array_value() and its variants is 0 on success
or negative on error. Note the difference to gpiod_get_value(), which returns
0 or 1 on success to convey the GPIO value. With the array functions, the GPIO

59
drivers/auxdisplay/hd44780.c
View File

@ -62,20 +62,15 @@ static void hd44780_strobe_gpio(struct hd44780 *hd)
/* write to an LCD panel register in 8 bit GPIO mode */
static void hd44780_write_gpio8(struct hd44780 *hd, u8 val, unsigned int rs)
{
int values[10]; /* for DATA[0-7], RS, RW */
unsigned int i, n;
DECLARE_BITMAP(values, 10); /* for DATA[0-7], RS, RW */
unsigned int n;
for (i = 0; i < 8; i++)
values[PIN_DATA0 + i] = !!(val & BIT(i));
values[PIN_CTRL_RS] = rs;
n = 9;
if (hd->pins[PIN_CTRL_RW]) {
values[PIN_CTRL_RW] = 0;
n++;
}
values[0] = val;
__assign_bit(8, values, rs);
n = hd->pins[PIN_CTRL_RW] ? 10 : 9;
/* Present the data to the port */
gpiod_set_array_value_cansleep(n, &hd->pins[PIN_DATA0], values);
gpiod_set_array_value_cansleep(n, &hd->pins[PIN_DATA0], NULL, values);
hd44780_strobe_gpio(hd);
}
@ -83,32 +78,25 @@ static void hd44780_write_gpio8(struct hd44780 *hd, u8 val, unsigned int rs)
/* write to an LCD panel register in 4 bit GPIO mode */
static void hd44780_write_gpio4(struct hd44780 *hd, u8 val, unsigned int rs)
{
int values[10]; /* for DATA[0-7], RS, RW, but DATA[0-3] is unused */
unsigned int i, n;
DECLARE_BITMAP(values, 6); /* for DATA[4-7], RS, RW */
unsigned int n;
/* High nibble + RS, RW */
for (i = 4; i < 8; i++)
values[PIN_DATA0 + i] = !!(val & BIT(i));
values[PIN_CTRL_RS] = rs;
n = 5;
if (hd->pins[PIN_CTRL_RW]) {
values[PIN_CTRL_RW] = 0;
n++;
}
values[0] = val >> 4;
__assign_bit(4, values, rs);
n = hd->pins[PIN_CTRL_RW] ? 6 : 5;
/* Present the data to the port */
gpiod_set_array_value_cansleep(n, &hd->pins[PIN_DATA4],
&values[PIN_DATA4]);
gpiod_set_array_value_cansleep(n, &hd->pins[PIN_DATA4], NULL, values);
hd44780_strobe_gpio(hd);
/* Low nibble */
for (i = 0; i < 4; i++)
values[PIN_DATA4 + i] = !!(val & BIT(i));
values[0] &= ~0x0fUL;
values[0] |= val & 0x0f;
/* Present the data to the port */
gpiod_set_array_value_cansleep(n, &hd->pins[PIN_DATA4],
&values[PIN_DATA4]);
gpiod_set_array_value_cansleep(n, &hd->pins[PIN_DATA4], NULL, values);
hd44780_strobe_gpio(hd);
}
@ -155,23 +143,16 @@ static void hd44780_write_cmd_gpio4(struct charlcd *lcd, int cmd)
/* Send 4-bits of a command to the LCD panel in raw 4 bit GPIO mode */
static void hd44780_write_cmd_raw_gpio4(struct charlcd *lcd, int cmd)
{
int values[10]; /* for DATA[0-7], RS, RW, but DATA[0-3] is unused */
DECLARE_BITMAP(values, 6); /* for DATA[4-7], RS, RW */
struct hd44780 *hd = lcd->drvdata;
unsigned int i, n;
unsigned int n;
/* Command nibble + RS, RW */
for (i = 0; i < 4; i++)
values[PIN_DATA4 + i] = !!(cmd & BIT(i));
values[PIN_CTRL_RS] = 0;
n = 5;
if (hd->pins[PIN_CTRL_RW]) {
values[PIN_CTRL_RW] = 0;
n++;
}
values[0] = cmd & 0x0f;
n = hd->pins[PIN_CTRL_RW] ? 6 : 5;
/* Present the data to the port */
gpiod_set_array_value_cansleep(n, &hd->pins[PIN_DATA4],
&values[PIN_DATA4]);
gpiod_set_array_value_cansleep(n, &hd->pins[PIN_DATA4], NULL, values);
hd44780_strobe_gpio(hd);
}

20
drivers/bus/ts-nbus.c
View File

@ -110,13 +110,12 @@ static void ts_nbus_set_direction(struct ts_nbus *ts_nbus, int direction)
*/
static void ts_nbus_reset_bus(struct ts_nbus *ts_nbus)
{
int i;
int values[8];
DECLARE_BITMAP(values, 8);
for (i = 0; i < 8; i++)
values[i] = 0;
values[0] = 0;
gpiod_set_array_value_cansleep(8, ts_nbus->data->desc, values);
gpiod_set_array_value_cansleep(8, ts_nbus->data->desc,
ts_nbus->data->info, values);
gpiod_set_value_cansleep(ts_nbus->csn, 0);
gpiod_set_value_cansleep(ts_nbus->strobe, 0);
gpiod_set_value_cansleep(ts_nbus->ale, 0);
@ -157,16 +156,11 @@ static int ts_nbus_read_byte(struct ts_nbus *ts_nbus, u8 *val)
static void ts_nbus_write_byte(struct ts_nbus *ts_nbus, u8 byte)
{
struct gpio_descs *gpios = ts_nbus->data;
int i;
int values[8];
DECLARE_BITMAP(values, 8);
for (i = 0; i < 8; i++)
if (byte & BIT(i))
values[i] = 1;
else
values[i] = 0;
values[0] = byte;
gpiod_set_array_value_cansleep(8, gpios->desc, values);
gpiod_set_array_value_cansleep(8, gpios->desc, gpios->info, values);
}
/*

16
drivers/gpio/gpio-max3191x.c
View File

@ -313,18 +313,21 @@ static int max3191x_set_config(struct gpio_chip *gpio, unsigned int offset,
static void gpiod_set_array_single_value_cansleep(unsigned int ndescs,
struct gpio_desc **desc,
struct gpio_array *info,
int value)
{
int i, *values;
unsigned long *values;
values = kmalloc_array(ndescs, sizeof(*values), GFP_KERNEL);
values = bitmap_alloc(ndescs, GFP_KERNEL);
if (!values)
return;
for (i = 0; i < ndescs; i++)
values[i] = value;
if (value)
bitmap_fill(values, ndescs);
else
bitmap_zero(values, ndescs);
gpiod_set_array_value_cansleep(ndescs, desc, values);
gpiod_set_array_value_cansleep(ndescs, desc, info, values);
kfree(values);
}
@ -397,7 +400,8 @@ static int max3191x_probe(struct spi_device *spi)
if (max3191x->modesel_pins)
gpiod_set_array_single_value_cansleep(
max3191x->modesel_pins->ndescs,
max3191x->modesel_pins->desc, max3191x->mode);
max3191x->modesel_pins->desc,
max3191x->modesel_pins->info, max3191x->mode);
max3191x->ignore_uv = device_property_read_bool(dev,
"maxim,ignore-undervoltage");

265
drivers/gpio/gpiolib.c
View File

@ -427,7 +427,7 @@ static long linehandle_ioctl(struct file *filep, unsigned int cmd,
struct linehandle_state *lh = filep->private_data;
void __user *ip = (void __user *)arg;
struct gpiohandle_data ghd;
int vals[GPIOHANDLES_MAX];
DECLARE_BITMAP(vals, GPIOHANDLES_MAX);
int i;
if (cmd == GPIOHANDLE_GET_LINE_VALUES_IOCTL) {
@ -436,13 +436,14 @@ static long linehandle_ioctl(struct file *filep, unsigned int cmd,
true,
lh->numdescs,
lh->descs,
NULL,
vals);
if (ret)
return ret;
memset(&ghd, 0, sizeof(ghd));
for (i = 0; i < lh->numdescs; i++)
ghd.values[i] = vals[i];
ghd.values[i] = test_bit(i, vals);
if (copy_to_user(ip, &ghd, sizeof(ghd)))
return -EFAULT;
@ -461,13 +462,14 @@ static long linehandle_ioctl(struct file *filep, unsigned int cmd,
/* Clamp all values to [0,1] */
for (i = 0; i < lh->numdescs; i++)
vals[i] = !!ghd.values[i];
__assign_bit(i, vals, ghd.values[i]);
/* Reuse the array setting function */
return gpiod_set_array_value_complex(false,
true,
lh->numdescs,
lh->descs,
NULL,
vals);
}
return -EINVAL;
@ -2813,9 +2815,39 @@ static int gpio_chip_get_multiple(struct gpio_chip *chip,
int gpiod_get_array_value_complex(bool raw, bool can_sleep,
unsigned int array_size,
struct gpio_desc **desc_array,
int *value_array)
struct gpio_array *array_info,
unsigned long *value_bitmap)
{
int i = 0;
int err, i = 0;
/*
* Validate array_info against desc_array and its size.
* It should immediately follow desc_array if both
* have been obtained from the same gpiod_get_array() call.
*/
if (array_info && array_info->desc == desc_array &&
array_size <= array_info->size &&
(void *)array_info == desc_array + array_info->size) {
if (!can_sleep)
WARN_ON(array_info->chip->can_sleep);
err = gpio_chip_get_multiple(array_info->chip,
array_info->get_mask,
value_bitmap);
if (err)
return err;
if (!raw && !bitmap_empty(array_info->invert_mask, array_size))
bitmap_xor(value_bitmap, value_bitmap,
array_info->invert_mask, array_size);
if (bitmap_full(array_info->get_mask, array_size))
return 0;
i = find_first_zero_bit(array_info->get_mask, array_size);
} else {
array_info = NULL;
}
while (i < array_size) {
struct gpio_chip *chip = desc_array[i]->gdev->chip;
@ -2846,7 +2878,12 @@ int gpiod_get_array_value_complex(bool raw, bool can_sleep,
int hwgpio = gpio_chip_hwgpio(desc);
__set_bit(hwgpio, mask);
i++;
if (array_info)
find_next_zero_bit(array_info->get_mask,
array_size, i);
else
i++;
} while ((i < array_size) &&
(desc_array[i]->gdev->chip == chip));
@ -2857,15 +2894,20 @@ int gpiod_get_array_value_complex(bool raw, bool can_sleep,
return ret;
}
for (j = first; j < i; j++) {
for (j = first; j < i; ) {
const struct gpio_desc *desc = desc_array[j];
int hwgpio = gpio_chip_hwgpio(desc);
int value = test_bit(hwgpio, bits);
if (!raw && test_bit(FLAG_ACTIVE_LOW, &desc->flags))
value = !value;
value_array[j] = value;
__assign_bit(j, value_bitmap, value);
trace_gpio_value(desc_to_gpio(desc), 1, value);
if (array_info)
find_next_zero_bit(array_info->get_mask, i, j);
else
j++;
}
if (mask != fastpath)
@ -2924,9 +2966,10 @@ EXPORT_SYMBOL_GPL(gpiod_get_value);
/**
* gpiod_get_raw_array_value() - read raw values from an array of GPIOs
* @array_size: number of elements in the descriptor / value arrays
* @array_size: number of elements in the descriptor array / value bitmap
* @desc_array: array of GPIO descriptors whose values will be read
* @value_array: array to store the read values
* @array_info: information on applicability of fast bitmap processing path
* @value_bitmap: bitmap to store the read values
*
* Read the raw values of the GPIOs, i.e. the values of the physical lines
* without regard for their ACTIVE_LOW status. Return 0 in case of success,
@ -2936,20 +2979,24 @@ EXPORT_SYMBOL_GPL(gpiod_get_value);
* and it will complain if the GPIO chip functions potentially sleep.
*/
int gpiod_get_raw_array_value(unsigned int array_size,
struct gpio_desc **desc_array, int *value_array)
struct gpio_desc **desc_array,
struct gpio_array *array_info,
unsigned long *value_bitmap)
{
if (!desc_array)
return -EINVAL;
return gpiod_get_array_value_complex(true, false, array_size,
desc_array, value_array);
desc_array, array_info,
value_bitmap);
}
EXPORT_SYMBOL_GPL(gpiod_get_raw_array_value);
/**
* gpiod_get_array_value() - read values from an array of GPIOs
* @array_size: number of elements in the descriptor / value arrays
* @array_size: number of elements in the descriptor array / value bitmap
* @desc_array: array of GPIO descriptors whose values will be read
* @value_array: array to store the read values
* @array_info: information on applicability of fast bitmap processing path
* @value_bitmap: bitmap to store the read values
*
* Read the logical values of the GPIOs, i.e. taking their ACTIVE_LOW status
* into account. Return 0 in case of success, else an error code.
@ -2958,12 +3005,15 @@ EXPORT_SYMBOL_GPL(gpiod_get_raw_array_value);
* and it will complain if the GPIO chip functions potentially sleep.
*/
int gpiod_get_array_value(unsigned int array_size,
struct gpio_desc **desc_array, int *value_array)
struct gpio_desc **desc_array,
struct gpio_array *array_info,
unsigned long *value_bitmap)
{
if (!desc_array)
return -EINVAL;
return gpiod_get_array_value_complex(false, false, array_size,
desc_array, value_array);
desc_array, array_info,
value_bitmap);
}
EXPORT_SYMBOL_GPL(gpiod_get_array_value);
@ -3056,10 +3106,37 @@ static void gpio_chip_set_multiple(struct gpio_chip *chip,
int gpiod_set_array_value_complex(bool raw, bool can_sleep,
unsigned int array_size,
struct gpio_desc **desc_array,
int *value_array)
struct gpio_array *array_info,
unsigned long *value_bitmap)
{
int i = 0;
/*
* Validate array_info against desc_array and its size.
* It should immediately follow desc_array if both
* have been obtained from the same gpiod_get_array() call.
*/
if (array_info && array_info->desc == desc_array &&
array_size <= array_info->size &&
(void *)array_info == desc_array + array_info->size) {
if (!can_sleep)
WARN_ON(array_info->chip->can_sleep);
if (!raw && !bitmap_empty(array_info->invert_mask, array_size))
bitmap_xor(value_bitmap, value_bitmap,
array_info->invert_mask, array_size);
gpio_chip_set_multiple(array_info->chip, array_info->set_mask,
value_bitmap);
if (bitmap_full(array_info->set_mask, array_size))
return 0;
i = find_first_zero_bit(array_info->set_mask, array_size);
} else {
array_info = NULL;
}
while (i < array_size) {
struct gpio_chip *chip = desc_array[i]->gdev->chip;
unsigned long fastpath[2 * BITS_TO_LONGS(FASTPATH_NGPIO)];
@ -3085,9 +3162,16 @@ int gpiod_set_array_value_complex(bool raw, bool can_sleep,
do {
struct gpio_desc *desc = desc_array[i];
int hwgpio = gpio_chip_hwgpio(desc);
int value = value_array[i];
int value = test_bit(i, value_bitmap);
if (!raw && test_bit(FLAG_ACTIVE_LOW, &desc->flags))
/*
* Pins applicable for fast input but not for
* fast output processing may have been already
* inverted inside the fast path, skip them.
*/
if (!raw && !(array_info &&
test_bit(i, array_info->invert_mask)) &&
test_bit(FLAG_ACTIVE_LOW, &desc->flags))
value = !value;
trace_gpio_value(desc_to_gpio(desc), 0, value);
/*
@ -3106,7 +3190,12 @@ int gpiod_set_array_value_complex(bool raw, bool can_sleep,
__clear_bit(hwgpio, bits);
count++;
}
i++;
if (array_info)
find_next_zero_bit(array_info->set_mask,
array_size, i);
else
i++;
} while ((i < array_size) &&
(desc_array[i]->gdev->chip == chip));
/* push collected bits to outputs */
@ -3181,9 +3270,10 @@ EXPORT_SYMBOL_GPL(gpiod_set_value);
/**
* gpiod_set_raw_array_value() - assign values to an array of GPIOs
* @array_size: number of elements in the descriptor / value arrays
* @array_size: number of elements in the descriptor array / value bitmap
* @desc_array: array of GPIO descriptors whose values will be assigned
* @value_array: array of values to assign
* @array_info: information on applicability of fast bitmap processing path
* @value_bitmap: bitmap of values to assign
*
* Set the raw values of the GPIOs, i.e. the values of the physical lines
* without regard for their ACTIVE_LOW status.
@ -3192,20 +3282,23 @@ EXPORT_SYMBOL_GPL(gpiod_set_value);
* complain if the GPIO chip functions potentially sleep.
*/
int gpiod_set_raw_array_value(unsigned int array_size,
struct gpio_desc **desc_array, int *value_array)
struct gpio_desc **desc_array,
struct gpio_array *array_info,
unsigned long *value_bitmap)
{
if (!desc_array)
return -EINVAL;
return gpiod_set_array_value_complex(true, false, array_size,
desc_array, value_array);
desc_array, array_info, value_bitmap);
}
EXPORT_SYMBOL_GPL(gpiod_set_raw_array_value);
/**
* gpiod_set_array_value() - assign values to an array of GPIOs
* @array_size: number of elements in the descriptor / value arrays
* @array_size: number of elements in the descriptor array / value bitmap
* @desc_array: array of GPIO descriptors whose values will be assigned
* @value_array: array of values to assign
* @array_info: information on applicability of fast bitmap processing path
* @value_bitmap: bitmap of values to assign
*
* Set the logical values of the GPIOs, i.e. taking their ACTIVE_LOW status
* into account.
@ -3214,12 +3307,14 @@ EXPORT_SYMBOL_GPL(gpiod_set_raw_array_value);
* complain if the GPIO chip functions potentially sleep.
*/
void gpiod_set_array_value(unsigned int array_size,
struct gpio_desc **desc_array, int *value_array)
struct gpio_desc **desc_array,
struct gpio_array *array_info,
unsigned long *value_bitmap)
{
if (!desc_array)
return;
gpiod_set_array_value_complex(false, false, array_size, desc_array,
value_array);
array_info, value_bitmap);
}
EXPORT_SYMBOL_GPL(gpiod_set_array_value);
@ -3487,9 +3582,10 @@ EXPORT_SYMBOL_GPL(gpiod_get_value_cansleep);
/**
* gpiod_get_raw_array_value_cansleep() - read raw values from an array of GPIOs
* @array_size: number of elements in the descriptor / value arrays
* @array_size: number of elements in the descriptor array / value bitmap
* @desc_array: array of GPIO descriptors whose values will be read
* @value_array: array to store the read values
* @array_info: information on applicability of fast bitmap processing path
* @value_bitmap: bitmap to store the read values
*
* Read the raw values of the GPIOs, i.e. the values of the physical lines
* without regard for their ACTIVE_LOW status. Return 0 in case of success,
@ -3499,21 +3595,24 @@ EXPORT_SYMBOL_GPL(gpiod_get_value_cansleep);
*/
int gpiod_get_raw_array_value_cansleep(unsigned int array_size,
struct gpio_desc **desc_array,
int *value_array)
struct gpio_array *array_info,
unsigned long *value_bitmap)
{
might_sleep_if(extra_checks);
if (!desc_array)
return -EINVAL;
return gpiod_get_array_value_complex(true, true, array_size,
desc_array, value_array);
desc_array, array_info,
value_bitmap);
}
EXPORT_SYMBOL_GPL(gpiod_get_raw_array_value_cansleep);
/**
* gpiod_get_array_value_cansleep() - read values from an array of GPIOs
* @array_size: number of elements in the descriptor / value arrays
* @array_size: number of elements in the descriptor array / value bitmap
* @desc_array: array of GPIO descriptors whose values will be read
* @value_array: array to store the read values
* @array_info: information on applicability of fast bitmap processing path
* @value_bitmap: bitmap to store the read values
*
* Read the logical values of the GPIOs, i.e. taking their ACTIVE_LOW status
* into account. Return 0 in case of success, else an error code.
@ -3522,13 +3621,15 @@ EXPORT_SYMBOL_GPL(gpiod_get_raw_array_value_cansleep);
*/
int gpiod_get_array_value_cansleep(unsigned int array_size,
struct gpio_desc **desc_array,
int *value_array)
struct gpio_array *array_info,
unsigned long *value_bitmap)
{
might_sleep_if(extra_checks);
if (!desc_array)
return -EINVAL;
return gpiod_get_array_value_complex(false, true, array_size,
desc_array, value_array);
desc_array, array_info,
value_bitmap);
}
EXPORT_SYMBOL_GPL(gpiod_get_array_value_cansleep);
@ -3570,9 +3671,10 @@ EXPORT_SYMBOL_GPL(gpiod_set_value_cansleep);
/**
* gpiod_set_raw_array_value_cansleep() - assign values to an array of GPIOs
* @array_size: number of elements in the descriptor / value arrays
* @array_size: number of elements in the descriptor array / value bitmap
* @desc_array: array of GPIO descriptors whose values will be assigned
* @value_array: array of values to assign
* @array_info: information on applicability of fast bitmap processing path
* @value_bitmap: bitmap of values to assign
*
* Set the raw values of the GPIOs, i.e. the values of the physical lines
* without regard for their ACTIVE_LOW status.
@ -3581,13 +3683,14 @@ EXPORT_SYMBOL_GPL(gpiod_set_value_cansleep);
*/
int gpiod_set_raw_array_value_cansleep(unsigned int array_size,
struct gpio_desc **desc_array,
int *value_array)
struct gpio_array *array_info,
unsigned long *value_bitmap)
{
might_sleep_if(extra_checks);
if (!desc_array)
return -EINVAL;
return gpiod_set_array_value_complex(true, true, array_size, desc_array,
value_array);
array_info, value_bitmap);
}
EXPORT_SYMBOL_GPL(gpiod_set_raw_array_value_cansleep);
@ -3610,9 +3713,10 @@ void gpiod_add_lookup_tables(struct gpiod_lookup_table **tables, size_t n)
/**
* gpiod_set_array_value_cansleep() - assign values to an array of GPIOs
* @array_size: number of elements in the descriptor / value arrays
* @array_size: number of elements in the descriptor array / value bitmap
* @desc_array: array of GPIO descriptors whose values will be assigned
* @value_array: array of values to assign
* @array_info: information on applicability of fast bitmap processing path
* @value_bitmap: bitmap of values to assign
*
* Set the logical values of the GPIOs, i.e. taking their ACTIVE_LOW status
* into account.
@ -3621,13 +3725,14 @@ void gpiod_add_lookup_tables(struct gpiod_lookup_table **tables, size_t n)
*/
void gpiod_set_array_value_cansleep(unsigned int array_size,
struct gpio_desc **desc_array,
int *value_array)
struct gpio_array *array_info,
unsigned long *value_bitmap)
{
might_sleep_if(extra_checks);
if (!desc_array)
return;
gpiod_set_array_value_complex(false, true, array_size, desc_array,
value_array);
array_info, value_bitmap);
}
EXPORT_SYMBOL_GPL(gpiod_set_array_value_cansleep);
@ -4247,7 +4352,9 @@ struct gpio_descs *__must_check gpiod_get_array(struct device *dev,
{
struct gpio_desc *desc;
struct gpio_descs *descs;
int count;
struct gpio_array *array_info = NULL;
struct gpio_chip *chip;
int count, bitmap_size;
count = gpiod_count(dev, con_id);
if (count < 0)
@ -4263,9 +4370,77 @@ struct gpio_descs *__must_check gpiod_get_array(struct device *dev,
gpiod_put_array(descs);
return ERR_CAST(desc);
}
descs->desc[descs->ndescs] = desc;
chip = gpiod_to_chip(desc);
/*
* Select a chip of first array member
* whose index matches its pin hardware number
* as a candidate for fast bitmap processing.
*/
if (!array_info && gpio_chip_hwgpio(desc) == descs->ndescs) {
struct gpio_descs *array;
bitmap_size = BITS_TO_LONGS(chip->ngpio > count ?
chip->ngpio : count);
array = kzalloc(struct_size(descs, desc, count) +
struct_size(array_info, invert_mask,
3 * bitmap_size), GFP_KERNEL);
if (!array) {
gpiod_put_array(descs);
return ERR_PTR(-ENOMEM);
}
memcpy(array, descs,
struct_size(descs, desc, descs->ndescs + 1));
kfree(descs);
descs = array;
array_info = (void *)(descs->desc + count);
array_info->get_mask = array_info->invert_mask +
bitmap_size;
array_info->set_mask = array_info->get_mask +
bitmap_size;
array_info->desc = descs->desc;
array_info->size = count;
array_info->chip = chip;
bitmap_set(array_info->get_mask, descs->ndescs,
count - descs->ndescs);
bitmap_set(array_info->set_mask, descs->ndescs,
count - descs->ndescs);
descs->info = array_info;
}
/*
* Unmark members which don't qualify for fast bitmap
* processing (different chip, not in hardware order)
*/
if (array_info && (chip != array_info->chip ||
gpio_chip_hwgpio(desc) != descs->ndescs)) {
__clear_bit(descs->ndescs, array_info->get_mask);
__clear_bit(descs->ndescs, array_info->set_mask);
} else if (array_info) {
/* Exclude open drain or open source from fast output */
if (gpiochip_line_is_open_drain(chip, descs->ndescs) ||
gpiochip_line_is_open_source(chip, descs->ndescs))
__clear_bit(descs->ndescs,
array_info->set_mask);
/* Identify 'fast' pins which require invertion */
if (gpiod_is_active_low(desc))
__set_bit(descs->ndescs,
array_info->invert_mask);
}
descs->ndescs++;
}
if (array_info)
dev_dbg(dev,
"GPIO array info: chip=%s, size=%d, get_mask=%lx, set_mask=%lx, invert_mask=%lx\n",
array_info->chip->label, array_info->size,
*array_info->get_mask, *array_info->set_mask,
*array_info->invert_mask);
return descs;
}
EXPORT_SYMBOL_GPL(gpiod_get_array);

15
drivers/gpio/gpiolib.h
View File

@ -183,15 +183,26 @@ static inline bool acpi_can_fallback_to_crs(struct acpi_device *adev,
}
#endif
struct gpio_array {
struct gpio_desc **desc;
unsigned int size;
struct gpio_chip *chip;
unsigned long *get_mask;
unsigned long *set_mask;
unsigned long invert_mask[];
};
struct gpio_desc *gpiochip_get_desc(struct gpio_chip *chip, u16 hwnum);
int gpiod_get_array_value_complex(bool raw, bool can_sleep,
unsigned int array_size,
struct gpio_desc **desc_array,
int *value_array);
struct gpio_array *array_info,
unsigned long *value_bitmap);
int gpiod_set_array_value_complex(bool raw, bool can_sleep,
unsigned int array_size,
struct gpio_desc **desc_array,
int *value_array);
struct gpio_array *array_info,
unsigned long *value_bitmap);
/* This is just passed between gpiolib and devres */
struct gpio_desc *gpiod_get_from_of_node(struct device_node *node,

14
drivers/i2c/muxes/i2c-mux-gpio.c
View File

@ -22,18 +22,16 @@ struct gpiomux {
struct i2c_mux_gpio_platform_data data;
unsigned gpio_base;
struct gpio_desc **gpios;
int *values;
};
static void i2c_mux_gpio_set(const struct gpiomux *mux, unsigned val)
{
int i;
DECLARE_BITMAP(values, BITS_PER_TYPE(val));
for (i = 0; i < mux->data.n_gpios; i++)
mux->values[i] = (val >> i) & 1;
values[0] = val;
gpiod_set_array_value_cansleep(mux->data.n_gpios,
mux->gpios, mux->values);
gpiod_set_array_value_cansleep(mux->data.n_gpios, mux->gpios, NULL,
values);
}
static int i2c_mux_gpio_select(struct i2c_mux_core *muxc, u32 chan)
@ -182,15 +180,13 @@ static int i2c_mux_gpio_probe(struct platform_device *pdev)
return -EPROBE_DEFER;
muxc = i2c_mux_alloc(parent, &pdev->dev, mux->data.n_values,
mux->data.n_gpios * sizeof(*mux->gpios) +
mux->data.n_gpios * sizeof(*mux->values), 0,
mux->data.n_gpios * sizeof(*mux->gpios), 0,
i2c_mux_gpio_select, NULL);
if (!muxc) {
ret = -ENOMEM;
goto alloc_failed;
}
mux->gpios = muxc->priv;
mux->values = (int *)(mux->gpios + mux->data.n_gpios);
muxc->priv = mux;
platform_set_drvdata(pdev, muxc);

13
drivers/mmc/core/pwrseq_simple.c
View File

@ -40,18 +40,13 @@ static void mmc_pwrseq_simple_set_gpios_value(struct mmc_pwrseq_simple *pwrseq,
struct gpio_descs *reset_gpios = pwrseq->reset_gpios;
if (!IS_ERR(reset_gpios)) {
int i, *values;
DECLARE_BITMAP(values, BITS_PER_TYPE(value));
int nvalues = reset_gpios->ndescs;
values = kmalloc_array(nvalues, sizeof(int), GFP_KERNEL);
if (!values)
return;
values[0] = value;
for (i = 0; i < nvalues; i++)
values[i] = value;
gpiod_set_array_value_cansleep(nvalues, reset_gpios->desc, values);
kfree(values);
gpiod_set_array_value_cansleep(nvalues, reset_gpios->desc,
reset_gpios->info, values);
}
}

12
drivers/mux/gpio.c
View File

@ -17,20 +17,18 @@
struct mux_gpio {
struct gpio_descs *gpios;
int *val;
};
static int mux_gpio_set(struct mux_control *mux, int state)
{
struct mux_gpio *mux_gpio = mux_chip_priv(mux->chip);
int i;
DECLARE_BITMAP(values, BITS_PER_TYPE(state));
for (i = 0; i < mux_gpio->gpios->ndescs; i++)
mux_gpio->val[i] = (state >> i) & 1;
values[0] = state;
gpiod_set_array_value_cansleep(mux_gpio->gpios->ndescs,
mux_gpio->gpios->desc,
mux_gpio->val);
mux_gpio->gpios->info, values);
return 0;
}
@ -58,13 +56,11 @@ static int mux_gpio_probe(struct platform_device *pdev)
if (pins < 0)
return pins;
mux_chip = devm_mux_chip_alloc(dev, 1, sizeof(*mux_gpio) +
pins * sizeof(*mux_gpio->val));
mux_chip = devm_mux_chip_alloc(dev, 1, sizeof(*mux_gpio));
if (IS_ERR(mux_chip))
return PTR_ERR(mux_chip);
mux_gpio = mux_chip_priv(mux_chip);
mux_gpio->val = (int *)(mux_gpio + 1);
mux_chip->ops = &mux_gpio_ops;
mux_gpio->gpios = devm_gpiod_get_array(dev, "mux", GPIOD_OUT_LOW);

11
drivers/net/phy/mdio-mux-gpio.c
View File

@ -20,23 +20,21 @@
struct mdio_mux_gpio_state {
struct gpio_descs *gpios;
void *mux_handle;
int values[];
};
static int mdio_mux_gpio_switch_fn(int current_child, int desired_child,
void *data)
{
struct mdio_mux_gpio_state *s = data;
unsigned int n;
DECLARE_BITMAP(values, BITS_PER_TYPE(desired_child));
if (current_child == desired_child)
return 0;
for (n = 0; n < s->gpios->ndescs; n++)
s->values[n] = (desired_child >> n) & 1;
values[0] = desired_child;
gpiod_set_array_value_cansleep(s->gpios->ndescs, s->gpios->desc,
s->values);
s->gpios->info, values);
return 0;
}
@ -51,8 +49,7 @@ static int mdio_mux_gpio_probe(struct platform_device *pdev)
if (IS_ERR(gpios))
return PTR_ERR(gpios);
s = devm_kzalloc(&pdev->dev, struct_size(s, values, gpios->ndescs),
GFP_KERNEL);
s = devm_kzalloc(&pdev->dev, sizeof(*s), GFP_KERNEL);
if (!s) {
gpiod_put_array(gpios);
return -ENOMEM;

9
drivers/pcmcia/soc_common.c
View File

@ -351,19 +351,20 @@ static int soc_common_pcmcia_config_skt(
if (ret == 0) {
struct gpio_desc *descs[2];
int values[2], n = 0;
DECLARE_BITMAP(values, 2);
int n = 0;
if (skt->gpio_reset) {
descs[n] = skt->gpio_reset;
values[n++] = !!(state->flags & SS_RESET);
__assign_bit(n++, values, state->flags & SS_RESET);
}
if (skt->gpio_bus_enable) {
descs[n] = skt->gpio_bus_enable;
values[n++] = !!(state->flags & SS_OUTPUT_ENA);
__assign_bit(n++, values, state->flags & SS_OUTPUT_ENA);
}
if (n)
gpiod_set_array_value_cansleep(n, descs, values);
gpiod_set_array_value_cansleep(n, descs, NULL, values);
/*
* This really needs a better solution. The IRQ

19
drivers/phy/motorola/phy-mapphone-mdm6600.c
View File

@ -157,15 +157,13 @@ static const struct phy_ops gpio_usb_ops = {
*/
static void phy_mdm6600_cmd(struct phy_mdm6600 *ddata, int val)
{
int values[PHY_MDM6600_NR_CMD_LINES];
int i;
DECLARE_BITMAP(values, PHY_MDM6600_NR_CMD_LINES);
val &= (1 << PHY_MDM6600_NR_CMD_LINES) - 1;
for (i = 0; i < PHY_MDM6600_NR_CMD_LINES; i++)
values[i] = (val & BIT(i)) >> i;
values[0] = val;
gpiod_set_array_value_cansleep(PHY_MDM6600_NR_CMD_LINES,
ddata->cmd_gpios->desc, values);
ddata->cmd_gpios->desc,
ddata->cmd_gpios->info, values);
}
/**
@ -176,7 +174,7 @@ static void phy_mdm6600_status(struct work_struct *work)
{
struct phy_mdm6600 *ddata;
struct device *dev;
int values[PHY_MDM6600_NR_STATUS_LINES];
DECLARE_BITMAP(values, PHY_MDM6600_NR_STATUS_LINES);
int error, i, val = 0;
ddata = container_of(work, struct phy_mdm6600, status_work.work);
@ -184,16 +182,17 @@ static void phy_mdm6600_status(struct work_struct *work)
error = gpiod_get_array_value_cansleep(PHY_MDM6600_NR_STATUS_LINES,
ddata->status_gpios->desc,
ddata->status_gpios->info,
values);
if (error)
return;
for (i = 0; i < PHY_MDM6600_NR_STATUS_LINES; i++) {
val |= values[i] << i;
val |= test_bit(i, values) << i;
dev_dbg(ddata->dev, "XXX %s: i: %i values[i]: %i val: %i\n",
__func__, i, values[i], val);
__func__, i, test_bit(i, values), val);
}
ddata->status = val;
ddata->status = values[0];
dev_info(dev, "modem status: %i %s\n",
ddata->status,

8
drivers/staging/iio/adc/ad7606.c
View File

@ -202,7 +202,7 @@ static int ad7606_write_raw(struct iio_dev *indio_dev,
long mask)
{
struct ad7606_state *st = iio_priv(indio_dev);
int values[3];
DECLARE_BITMAP(values, 3);
int ret, i;
switch (mask) {
@ -227,12 +227,10 @@ static int ad7606_write_raw(struct iio_dev *indio_dev,
if (ret < 0)
return ret;
values[0] = (ret >> 0) & 1;
values[1] = (ret >> 1) & 1;
values[2] = (ret >> 2) & 1;
values[0] = ret;
mutex_lock(&st->lock);
gpiod_set_array_value(ARRAY_SIZE(values), st->gpio_os->desc,
gpiod_set_array_value(3, st->gpio_os->desc, st->gpio_os->info,
values);
st->oversampling = val;
mutex_unlock(&st->lock);

7
drivers/tty/serial/serial_mctrl_gpio.c
View File

@ -40,7 +40,7 @@ void mctrl_gpio_set(struct mctrl_gpios *gpios, unsigned int mctrl)
{
enum mctrl_gpio_idx i;
struct gpio_desc *desc_array[UART_GPIO_MAX];
int value_array[UART_GPIO_MAX];
DECLARE_BITMAP(values, UART_GPIO_MAX);
unsigned int count = 0;
if (gpios == NULL)
@ -49,10 +49,11 @@ void mctrl_gpio_set(struct mctrl_gpios *gpios, unsigned int mctrl)
for (i = 0; i < UART_GPIO_MAX; i++)
if (gpios->gpio[i] && mctrl_gpios_desc[i].dir_out) {
desc_array[count] = gpios->gpio[i];
value_array[count] = !!(mctrl & mctrl_gpios_desc[i].mctrl);
__assign_bit(count, values,
mctrl & mctrl_gpios_desc[i].mctrl);
count++;
}
gpiod_set_array_value(count, desc_array, value_array);
gpiod_set_array_value(count, desc_array, NULL, values);
}
EXPORT_SYMBOL_GPL(mctrl_gpio_set);

59
include/linux/gpio/consumer.h
View File

@ -17,11 +17,20 @@ struct device;
*/
struct gpio_desc;
/**
* Opaque descriptor for a structure of GPIO array attributes. This structure
* is attached to struct gpiod_descs obtained from gpiod_get_array() and can be
* passed back to get/set array functions in order to activate fast processing
* path if applicable.
*/
struct gpio_array;
/**
* Struct containing an array of descriptors that can be obtained using
* gpiod_get_array().
*/
struct gpio_descs {
struct gpio_array *info;
unsigned int ndescs;
struct gpio_desc *desc[];
};
@ -104,36 +113,46 @@ int gpiod_direction_output_raw(struct gpio_desc *desc, int value);
/* Value get/set from non-sleeping context */
int gpiod_get_value(const struct gpio_desc *desc);
int gpiod_get_array_value(unsigned int array_size,
struct gpio_desc **desc_array, int *value_array);
struct gpio_desc **desc_array,
struct gpio_array *array_info,
unsigned long *value_bitmap);
void gpiod_set_value(struct gpio_desc *desc, int value);
void gpiod_set_array_value(unsigned int array_size,
struct gpio_desc **desc_array, int *value_array);
struct gpio_desc **desc_array,
struct gpio_array *array_info,
unsigned long *value_bitmap);
int gpiod_get_raw_value(const struct gpio_desc *desc);
int gpiod_get_raw_array_value(unsigned int array_size,
struct gpio_desc **desc_array,
int *value_array);
struct gpio_array *array_info,
unsigned long *value_bitmap);
void gpiod_set_raw_value(struct gpio_desc *desc, int value);
int gpiod_set_raw_array_value(unsigned int array_size,
struct gpio_desc **desc_array,
int *value_array);
struct gpio_array *array_info,
unsigned long *value_bitmap);
/* Value get/set from sleeping context */
int gpiod_get_value_cansleep(const struct gpio_desc *desc);
int gpiod_get_array_value_cansleep(unsigned int array_size,
struct gpio_desc **desc_array,
int *value_array);
struct gpio_array *array_info,
unsigned long *value_bitmap);
void gpiod_set_value_cansleep(struct gpio_desc *desc, int value);
void gpiod_set_array_value_cansleep(unsigned int array_size,
struct gpio_desc **desc_array,
int *value_array);
struct gpio_array *array_info,
unsigned long *value_bitmap);
int gpiod_get_raw_value_cansleep(const struct gpio_desc *desc);
int gpiod_get_raw_array_value_cansleep(unsigned int array_size,
struct gpio_desc **desc_array,
int *value_array);
struct gpio_array *array_info,
unsigned long *value_bitmap);
void gpiod_set_raw_value_cansleep(struct gpio_desc *desc, int value);
int gpiod_set_raw_array_value_cansleep(unsigned int array_size,
struct gpio_desc **desc_array,
int *value_array);
struct gpio_array *array_info,
unsigned long *value_bitmap);
int gpiod_set_debounce(struct gpio_desc *desc, unsigned debounce);
int gpiod_set_transitory(struct gpio_desc *desc, bool transitory);
@ -330,7 +349,8 @@ static inline int gpiod_get_value(const struct gpio_desc *desc)
}
static inline int gpiod_get_array_value(unsigned int array_size,
struct gpio_desc **desc_array,
int *value_array)
struct gpio_array *array_info,
unsigned long *value_bitmap)
{
/* GPIO can never have been requested */
WARN_ON(1);
@ -343,7 +363,8 @@ static inline void gpiod_set_value(struct gpio_desc *desc, int value)
}
static inline void gpiod_set_array_value(unsigned int array_size,
struct gpio_desc **desc_array,
int *value_array)
struct gpio_array *array_info,
unsigned long *value_bitmap)
{
/* GPIO can never have been requested */
WARN_ON(1);
@ -356,7 +377,8 @@ static inline int gpiod_get_raw_value(const struct gpio_desc *desc)
}
static inline int gpiod_get_raw_array_value(unsigned int array_size,
struct gpio_desc **desc_array,
int *value_array)
struct gpio_array *array_info,
unsigned long *value_bitmap)
{
/* GPIO can never have been requested */
WARN_ON(1);
@ -369,7 +391,8 @@ static inline void gpiod_set_raw_value(struct gpio_desc *desc, int value)
}
static inline int gpiod_set_raw_array_value(unsigned int array_size,
struct gpio_desc **desc_array,
int *value_array)
struct gpio_array *array_info,
unsigned long *value_bitmap)
{
/* GPIO can never have been requested */
WARN_ON(1);
@ -384,7 +407,8 @@ static inline int gpiod_get_value_cansleep(const struct gpio_desc *desc)
}
static inline int gpiod_get_array_value_cansleep(unsigned int array_size,
struct gpio_desc **desc_array,
int *value_array)
struct gpio_array *array_info,
unsigned long *value_bitmap)
{
/* GPIO can never have been requested */
WARN_ON(1);
@ -397,7 +421,8 @@ static inline void gpiod_set_value_cansleep(struct gpio_desc *desc, int value)
}
static inline void gpiod_set_array_value_cansleep(unsigned int array_size,
struct gpio_desc **desc_array,
int *value_array)
struct gpio_array *array_info,
unsigned long *value_bitmap)
{
/* GPIO can never have been requested */
WARN_ON(1);
@ -410,7 +435,8 @@ static inline int gpiod_get_raw_value_cansleep(const struct gpio_desc *desc)
}
static inline int gpiod_get_raw_array_value_cansleep(unsigned int array_size,
struct gpio_desc **desc_array,
int *value_array)
struct gpio_array *array_info,
unsigned long *value_bitmap)
{
/* GPIO can never have been requested */
WARN_ON(1);
@ -424,7 +450,8 @@ static inline void gpiod_set_raw_value_cansleep(struct gpio_desc *desc,
}
static inline int gpiod_set_raw_array_value_cansleep(unsigned int array_size,
struct gpio_desc **desc_array,
int *value_array)
struct gpio_array *array_info,
unsigned long *value_bitmap)
{
/* GPIO can never have been requested */
WARN_ON(1);