[RFC RFT PATCH v4 3/4] gpiolib: Pass array info to get/set array functions

Janusz Krzysztofik
2018-08-20T23:43:16Z

In order to make use of array info obtained from gpiod_get_array() and
speed up processing of arrays matching single GPIO chip layout, that
information must be passed to get/set array functions. Extend the
functions' API with that additional parameter and update all users.
Pass NULL if a user bulids an array itself from single GPIOs.

Signed-off-by: Janusz Krzysztofik <jmkrzyszt@gmail.com>
---
Documentation/driver-api/gpio/consumer.rst | 14 ++++++++++--
drivers/auxdisplay/hd44780.c | 12 ++++++----
drivers/bus/ts-nbus.c | 6 +++--
drivers/gpio/gpio-max3191x.c | 6 +++--
drivers/gpio/gpiolib.c | 34 ++++++++++++++++++++---------
drivers/gpio/gpiolib.h | 2 ++
drivers/i2c/muxes/i2c-mux-gpio.c | 2 +-
drivers/mmc/core/pwrseq_simple.c | 2 +-
drivers/mux/gpio.c | 3 ++-
drivers/net/phy/mdio-mux-gpio.c | 2 +-
drivers/pcmcia/soc_common.c | 3 ++-
drivers/phy/motorola/phy-mapphone-mdm6600.c | 4 +++-
drivers/staging/iio/adc/ad7606.c | 3 ++-
drivers/tty/serial/serial_mctrl_gpio.c | 2 +-
include/linux/gpio/consumer.h | 8 +++++++
15 files changed, 75 insertions(+), 28 deletions(-)

diff --git a/Documentation/driver-api/gpio/consumer.rst b/Documentation/driver-api/gpio/consumer.rst
index 7e0298b9a7b9..0afd95a12b10 100644
--- a/Documentation/driver-api/gpio/consumer.rst
+++ b/Documentation/driver-api/gpio/consumer.rst
@@ -325,28 +325,36 @@ 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,
+ struct gpio_array *array_info,
unsigned long *value_bitmap);
int gpiod_get_raw_array_value(unsigned int array_size,
struct gpio_desc **desc_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,
+ 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,
+ struct gpio_array *array_info,
unsigned long *value_bitmap);

void gpiod_set_array_value(unsigned int array_size,
struct gpio_desc **desc_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,
+ struct gpio_array *array_info,
unsigned long *value_bitmap)
void gpiod_set_array_value_cansleep(unsigned int array_size,
struct gpio_desc **desc_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,
+ struct gpio_array *array_info,
unsigned long *value_bitmap)

The array can be an arbitrary set of GPIOs. The functions will try to access
@@ -358,6 +366,7 @@ accessed sequentially.
The functions take three arguments:
* array_size - the number of array elements
* desc_array - an array of GPIO descriptors
+ * 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)

@@ -368,12 +377,13 @@ 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_value_bitmap);
+ 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.
diff --git a/drivers/auxdisplay/hd44780.c b/drivers/auxdisplay/hd44780.c
index d340473aa142..6ae81632bc44 100644
--- a/drivers/auxdisplay/hd44780.c
+++ b/drivers/auxdisplay/hd44780.c
@@ -74,7 +74,8 @@ static void hd44780_write_gpio8(struct hd44780 *hd, u8 val, unsigned int rs)
}

/* Present the data to the port */
- gpiod_set_array_value_cansleep(n, &hd->pins[PIN_DATA0], value_bitmap);
+ gpiod_set_array_value_cansleep(n, &hd->pins[PIN_DATA0], NULL,
+ value_bitmap);

hd44780_strobe_gpio(hd);
}
@@ -97,7 +98,8 @@ static void hd44780_write_gpio4(struct hd44780 *hd, u8 val, unsigned int rs)
value_bitmap[0] = value_bitmap[0] >> PIN_DATA4;

/* Present the data to the port */
- gpiod_set_array_value_cansleep(n, &hd->pins[PIN_DATA4], value_bitmap);
+ gpiod_set_array_value_cansleep(n, &hd->pins[PIN_DATA4], NULL,
+ value_bitmap);

hd44780_strobe_gpio(hd);

@@ -106,7 +108,8 @@ static void hd44780_write_gpio4(struct hd44780 *hd, u8 val, unsigned int rs)
value_bitmap[0] |= val & ~((1 << PIN_DATA4) - 1);

/* Present the data to the port */
- gpiod_set_array_value_cansleep(n, &hd->pins[PIN_DATA4], value_bitmap);
+ gpiod_set_array_value_cansleep(n, &hd->pins[PIN_DATA4], NULL,
+ value_bitmap);

hd44780_strobe_gpio(hd);
}
@@ -169,7 +172,8 @@ static void hd44780_write_cmd_raw_gpio4(struct charlcd *lcd, int cmd)
value_bitmap[0] = value_bitmap[0] >> PIN_DATA4;

/* Present the data to the port */
- gpiod_set_array_value_cansleep(n, &hd->pins[PIN_DATA4], value_bitmap);
+ gpiod_set_array_value_cansleep(n, &hd->pins[PIN_DATA4], NULL,
+ value_bitmap);

hd44780_strobe_gpio(hd);
}
diff --git a/drivers/bus/ts-nbus.c b/drivers/bus/ts-nbus.c
index ce6c1e89236d..000d756eb42c 100644
--- a/drivers/bus/ts-nbus.c
+++ b/drivers/bus/ts-nbus.c
@@ -112,7 +112,8 @@ static void ts_nbus_reset_bus(struct ts_nbus *ts_nbus)
{
unsigned long value_bitmap[1] = { 0, };

- gpiod_set_array_value_cansleep(8, ts_nbus->data->desc, value_bitmap);
+ gpiod_set_array_value_cansleep(8, ts_nbus->data->desc,
+ ts_nbus->data->info, value_bitmap);
gpiod_set_value_cansleep(ts_nbus->csn, 0);
gpiod_set_value_cansleep(ts_nbus->strobe, 0);
gpiod_set_value_cansleep(ts_nbus->ale, 0);
@@ -155,7 +156,8 @@ static void ts_nbus_write_byte(struct ts_nbus *ts_nbus, u8 byte)
struct gpio_descs *gpios = ts_nbus->data;
unsigned long value_bitmap[1] = { byte, };

- gpiod_set_array_value_cansleep(8, gpios->desc, value_bitmap);
+ gpiod_set_array_value_cansleep(8, gpios->desc, gpios->info,
+ value_bitmap);
}

/*
diff --git a/drivers/gpio/gpio-max3191x.c b/drivers/gpio/gpio-max3191x.c
index c4ec1c82af27..4b43b5dabfd2 100644
--- a/drivers/gpio/gpio-max3191x.c
+++ b/drivers/gpio/gpio-max3191x.c
@@ -313,6 +313,7 @@ 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)
{
unsigned long *value_bitmap;
@@ -327,7 +328,7 @@ static void gpiod_set_array_single_value_cansleep(unsigned int ndescs,
else
bitmap_zero(value_bitmap, ndescs);

- gpiod_set_array_value_cansleep(ndescs, desc, value_bitmap);
+ gpiod_set_array_value_cansleep(ndescs, desc, info, value_bitmap);
kfree(value_bitmap);
}

@@ -400,7 +401,8 @@ 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");
diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index c1ed1c759345..4d26cdbdb7cf 100644
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -435,7 +435,7 @@ static long linehandle_ioctl(struct file *filep, unsigned int cmd,
int ret = gpiod_get_array_value_complex(false,
true,
lh->numdescs,
- lh->descs,
+ lh->descs, NULL,
value_bitmap);
if (ret)
return ret;
@@ -467,7 +467,7 @@ static long linehandle_ioctl(struct file *filep, unsigned int cmd,
return gpiod_set_array_value_complex(false,
true,
lh->numdescs,
- lh->descs,
+ lh->descs, NULL,
value_bitmap);
}
return -EINVAL;
@@ -2784,6 +2784,7 @@ 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,
+ struct gpio_array *array_info,
unsigned long *value_bitmap)
{
int i = 0;
@@ -2908,12 +2909,14 @@ EXPORT_SYMBOL_GPL(gpiod_get_value);
*/
int gpiod_get_raw_array_value(unsigned int array_size,
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_bitmap);
+ desc_array, array_info,
+ value_bitmap);
}
EXPORT_SYMBOL_GPL(gpiod_get_raw_array_value);

@@ -2931,12 +2934,14 @@ EXPORT_SYMBOL_GPL(gpiod_get_raw_array_value);
*/
int gpiod_get_array_value(unsigned int array_size,
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_bitmap);
+ desc_array, array_info,
+ value_bitmap);
}
EXPORT_SYMBOL_GPL(gpiod_get_array_value);

@@ -3029,6 +3034,7 @@ 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,
+ struct gpio_array *array_info,
unsigned long *value_bitmap)
{
int i = 0;
@@ -3166,12 +3172,13 @@ EXPORT_SYMBOL_GPL(gpiod_set_value);
*/
int gpiod_set_raw_array_value(unsigned int array_size,
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_bitmap);
+ desc_array, array_info, value_bitmap);
}
EXPORT_SYMBOL_GPL(gpiod_set_raw_array_value);

@@ -3189,12 +3196,13 @@ EXPORT_SYMBOL_GPL(gpiod_set_raw_array_value);
*/
void gpiod_set_array_value(unsigned int array_size,
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_bitmap);
+ array_info, value_bitmap);
}
EXPORT_SYMBOL_GPL(gpiod_set_array_value);

@@ -3426,13 +3434,15 @@ EXPORT_SYMBOL_GPL(gpiod_get_value_cansleep);
*/
int gpiod_get_raw_array_value_cansleep(unsigned int array_size,
struct gpio_desc **desc_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_bitmap);
+ desc_array, array_info,
+ value_bitmap);
}
EXPORT_SYMBOL_GPL(gpiod_get_raw_array_value_cansleep);

@@ -3449,13 +3459,15 @@ EXPORT_SYMBOL_GPL(gpiod_get_raw_array_value_cansleep);
*/
int gpiod_get_array_value_cansleep(unsigned int array_size,
struct gpio_desc **desc_array,
+ 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_bitmap);
+ desc_array, array_info,
+ value_bitmap);
}
EXPORT_SYMBOL_GPL(gpiod_get_array_value_cansleep);

@@ -3508,13 +3520,14 @@ EXPORT_SYMBOL_GPL(gpiod_set_value_cansleep);
*/
int gpiod_set_raw_array_value_cansleep(unsigned int array_size,
struct gpio_desc **desc_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_bitmap);
+ array_info, value_bitmap);
}
EXPORT_SYMBOL_GPL(gpiod_set_raw_array_value_cansleep);

@@ -3548,13 +3561,14 @@ 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,
+ 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_bitmap);
+ array_info, value_bitmap);
}
EXPORT_SYMBOL_GPL(gpiod_set_array_value_cansleep);

diff --git a/drivers/gpio/gpiolib.h b/drivers/gpio/gpiolib.h
index b60905d558b1..b65ca896b24d 100644
--- a/drivers/gpio/gpiolib.h
+++ b/drivers/gpio/gpiolib.h
@@ -196,10 +196,12 @@ 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,
+ 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,
+ struct gpio_array *array_info,
unsigned long *value_bitmap);

/* This is just passed between gpiolib and devres */
diff --git a/drivers/i2c/muxes/i2c-mux-gpio.c b/drivers/i2c/muxes/i2c-mux-gpio.c
index d675e0ca2fa4..aa3857ab42b5 100644
--- a/drivers/i2c/muxes/i2c-mux-gpio.c
+++ b/drivers/i2c/muxes/i2c-mux-gpio.c
@@ -34,7 +34,7 @@ static void i2c_mux_gpio_set(const struct gpiomux *mux, unsigned val)
mux->values[i] = (val >> i) & 1;

gpiod_set_array_value_cansleep(mux->data.n_gpios,
- mux->gpios, value_bitmap);
+ mux->gpios, NULL, value_bitmap);
}

static int i2c_mux_gpio_select(struct i2c_mux_core *muxc, u32 chan)
diff --git a/drivers/mmc/core/pwrseq_simple.c b/drivers/mmc/core/pwrseq_simple.c
index 0d6e3a5be3ba..5cf7eda8f68f 100644
--- a/drivers/mmc/core/pwrseq_simple.c
+++ b/drivers/mmc/core/pwrseq_simple.c
@@ -46,7 +46,7 @@ static void mmc_pwrseq_simple_set_gpios_value(struct mmc_pwrseq_simple *pwrseq,
value_bitmap[0] = value;

gpiod_set_array_value_cansleep(nvalues, reset_gpios->desc,
- value_bitmap);
+ reset_gpios->info, value_bitmap);
}
}

diff --git a/drivers/mux/gpio.c b/drivers/mux/gpio.c
index cc2d5f50472a..879f9f3f45dd 100644
--- a/drivers/mux/gpio.c
+++ b/drivers/mux/gpio.c
@@ -30,7 +30,8 @@ static int mux_gpio_set(struct mux_control *mux, int state)
mux_gpio->val[i] = (state >> i) & 1;

gpiod_set_array_value_cansleep(mux_gpio->gpios->ndescs,
- mux_gpio->gpios->desc, value_bitmap);
+ mux_gpio->gpios->desc,
+ mux_gpio->gpios->info, value_bitmap);

return 0;
}
diff --git a/drivers/net/phy/mdio-mux-gpio.c b/drivers/net/phy/mdio-mux-gpio.c
index 8e1ec750277e..c0ffa03c916b 100644
--- a/drivers/net/phy/mdio-mux-gpio.c
+++ b/drivers/net/phy/mdio-mux-gpio.c
@@ -37,7 +37,7 @@ static int mdio_mux_gpio_switch_fn(int current_child, int desired_child,
s->values[n] = (desired_child >> n) & 1;

gpiod_set_array_value_cansleep(s->gpios->ndescs, s->gpios->desc,
- value_bitmap);
+ s->gpios->info, value_bitmap);

return 0;
}
diff --git a/drivers/pcmcia/soc_common.c b/drivers/pcmcia/soc_common.c
index e0f89155c474..55978198cd2b 100644
--- a/drivers/pcmcia/soc_common.c
+++ b/drivers/pcmcia/soc_common.c
@@ -366,7 +366,8 @@ static int soc_common_pcmcia_config_skt(
}

if (n)
- gpiod_set_array_value_cansleep(n, descs, value_bitmap);
+ gpiod_set_array_value_cansleep(n, descs, NULL,
+ value_bitmap);

/*
* This really needs a better solution. The IRQ
diff --git a/drivers/phy/motorola/phy-mapphone-mdm6600.c b/drivers/phy/motorola/phy-mapphone-mdm6600.c
index b6477c3599c4..8f508338ec56 100644
--- a/drivers/phy/motorola/phy-mapphone-mdm6600.c
+++ b/drivers/phy/motorola/phy-mapphone-mdm6600.c
@@ -162,7 +162,8 @@ static void phy_mdm6600_cmd(struct phy_mdm6600 *ddata, int val)
value_bitmap[0] = val & ((1 << PHY_MDM6600_NR_CMD_LINES) - 1);

gpiod_set_array_value_cansleep(PHY_MDM6600_NR_CMD_LINES,
- ddata->cmd_gpios->desc, value_bitmap);
+ ddata->cmd_gpios->desc,
+ ddata->cmd_gpios->info, value_bitmap);
}

/**
@@ -181,6 +182,7 @@ 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,
value_bitmap);
if (error)
return;
diff --git a/drivers/staging/iio/adc/ad7606.c b/drivers/staging/iio/adc/ad7606.c
index 0eca047bc1cc..eb779d825724 100644
--- a/drivers/staging/iio/adc/ad7606.c
+++ b/drivers/staging/iio/adc/ad7606.c
@@ -230,7 +230,8 @@ static int ad7606_write_raw(struct iio_dev *indio_dev,
value_bitmap[0] = ret;

mutex_lock(&st->lock);
- gpiod_set_array_value(3, st->gpio_os->desc, value_bitmap);
+ gpiod_set_array_value(3, st->gpio_os->desc, st->gpio_os->info,
+ value_bitmap);
st->oversampling = val;
mutex_unlock(&st->lock);

diff --git a/drivers/tty/serial/serial_mctrl_gpio.c b/drivers/tty/serial/serial_mctrl_gpio.c
index bb8b4756d72d..8a04e3be5419 100644
--- a/drivers/tty/serial/serial_mctrl_gpio.c
+++ b/drivers/tty/serial/serial_mctrl_gpio.c
@@ -53,7 +53,7 @@ void mctrl_gpio_set(struct mctrl_gpios *gpios, unsigned int mctrl)
!!(mctrl & mctrl_gpios_desc[i].mctrl));
count++;
}
- gpiod_set_array_value(count, desc_array, value_bitmap);
+ gpiod_set_array_value(count, desc_array, NULL, value_bitmap);
}
EXPORT_SYMBOL_GPL(mctrl_gpio_set);

diff --git a/include/linux/gpio/consumer.h b/include/linux/gpio/consumer.h
index 8dede3e886af..bf037ebe2ed8 100644
--- a/include/linux/gpio/consumer.h
+++ b/include/linux/gpio/consumer.h
@@ -114,36 +114,44 @@ int gpiod_direction_output_raw(struct gpio_desc *desc, int value);
int gpiod_get_value(const struct gpio_desc *desc);
int gpiod_get_array_value(unsigned int array_size,
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,
+ 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,
+ 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,
+ 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,
+ 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,
+ 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,
+ 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,
+ struct gpio_array *array_info,
unsigned long *value_bitmap);

int gpiod_set_debounce(struct gpio_desc *desc, unsigned debounce);
--
2.16.4