linux/drivers/pinctrl/pinctrl-sx150x.c
Mika Westerberg 2956b5d94a pinctrl / gpio: Introduce .set_config() callback for GPIO chips
Currently we already have two pin configuration related callbacks
available for GPIO chips .set_single_ended() and .set_debounce(). In
future we expect to have even more, which does not scale well if we need
to add yet another callback to the GPIO chip structure for each possible
configuration parameter.

Better solution is to reuse what we already have available in the
generic pinconf.

To support this, we introduce a new .set_config() callback for GPIO
chips. The callback takes a single packed pin configuration value as
parameter. This can then be extended easily beyond what is currently
supported by just adding new types to the generic pinconf enum.

If the GPIO driver is backed up by a pinctrl driver the GPIO driver can
just assign gpiochip_generic_config() (introduced in this patch) to
.set_config and that will take care configuration requests are directed
to the pinctrl driver.

We then convert the existing drivers over .set_config() and finally
remove the .set_single_ended() and .set_debounce() callbacks.

Suggested-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2017-01-26 15:27:37 +01:00

1251 lines
29 KiB
C

/*
* Copyright (c) 2016, BayLibre, SAS. All rights reserved.
* Author: Neil Armstrong <narmstrong@baylibre.com>
*
* Copyright (c) 2010, Code Aurora Forum. All rights reserved.
*
* Driver for Semtech SX150X I2C GPIO Expanders
* The handling of the 4-bit chips (SX1501/SX1504/SX1507) is untested.
*
* Author: Gregory Bean <gbean@codeaurora.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 and
* only version 2 as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <linux/regmap.h>
#include <linux/i2c.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/mutex.h>
#include <linux/slab.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/gpio/driver.h>
#include <linux/pinctrl/pinconf.h>
#include <linux/pinctrl/pinctrl.h>
#include <linux/pinctrl/pinmux.h>
#include <linux/pinctrl/pinconf-generic.h>
#include "core.h"
#include "pinconf.h"
#include "pinctrl-utils.h"
/* The chip models of sx150x */
enum {
SX150X_123 = 0,
SX150X_456,
SX150X_789,
};
enum {
SX150X_789_REG_MISC_AUTOCLEAR_OFF = 1 << 0,
SX150X_MAX_REGISTER = 0xad,
SX150X_IRQ_TYPE_EDGE_RISING = 0x1,
SX150X_IRQ_TYPE_EDGE_FALLING = 0x2,
SX150X_789_RESET_KEY1 = 0x12,
SX150X_789_RESET_KEY2 = 0x34,
};
struct sx150x_123_pri {
u8 reg_pld_mode;
u8 reg_pld_table0;
u8 reg_pld_table1;
u8 reg_pld_table2;
u8 reg_pld_table3;
u8 reg_pld_table4;
u8 reg_advanced;
};
struct sx150x_456_pri {
u8 reg_pld_mode;
u8 reg_pld_table0;
u8 reg_pld_table1;
u8 reg_pld_table2;
u8 reg_pld_table3;
u8 reg_pld_table4;
u8 reg_advanced;
};
struct sx150x_789_pri {
u8 reg_drain;
u8 reg_polarity;
u8 reg_clock;
u8 reg_misc;
u8 reg_reset;
u8 ngpios;
};
struct sx150x_device_data {
u8 model;
u8 reg_pullup;
u8 reg_pulldn;
u8 reg_dir;
u8 reg_data;
u8 reg_irq_mask;
u8 reg_irq_src;
u8 reg_sense;
u8 ngpios;
union {
struct sx150x_123_pri x123;
struct sx150x_456_pri x456;
struct sx150x_789_pri x789;
} pri;
const struct pinctrl_pin_desc *pins;
unsigned int npins;
};
struct sx150x_pinctrl {
struct device *dev;
struct i2c_client *client;
struct pinctrl_dev *pctldev;
struct pinctrl_desc pinctrl_desc;
struct gpio_chip gpio;
struct irq_chip irq_chip;
struct regmap *regmap;
struct {
u32 sense;
u32 masked;
} irq;
struct mutex lock;
const struct sx150x_device_data *data;
};
static const struct pinctrl_pin_desc sx150x_4_pins[] = {
PINCTRL_PIN(0, "gpio0"),
PINCTRL_PIN(1, "gpio1"),
PINCTRL_PIN(2, "gpio2"),
PINCTRL_PIN(3, "gpio3"),
PINCTRL_PIN(4, "oscio"),
};
static const struct pinctrl_pin_desc sx150x_8_pins[] = {
PINCTRL_PIN(0, "gpio0"),
PINCTRL_PIN(1, "gpio1"),
PINCTRL_PIN(2, "gpio2"),
PINCTRL_PIN(3, "gpio3"),
PINCTRL_PIN(4, "gpio4"),
PINCTRL_PIN(5, "gpio5"),
PINCTRL_PIN(6, "gpio6"),
PINCTRL_PIN(7, "gpio7"),
PINCTRL_PIN(8, "oscio"),
};
static const struct pinctrl_pin_desc sx150x_16_pins[] = {
PINCTRL_PIN(0, "gpio0"),
PINCTRL_PIN(1, "gpio1"),
PINCTRL_PIN(2, "gpio2"),
PINCTRL_PIN(3, "gpio3"),
PINCTRL_PIN(4, "gpio4"),
PINCTRL_PIN(5, "gpio5"),
PINCTRL_PIN(6, "gpio6"),
PINCTRL_PIN(7, "gpio7"),
PINCTRL_PIN(8, "gpio8"),
PINCTRL_PIN(9, "gpio9"),
PINCTRL_PIN(10, "gpio10"),
PINCTRL_PIN(11, "gpio11"),
PINCTRL_PIN(12, "gpio12"),
PINCTRL_PIN(13, "gpio13"),
PINCTRL_PIN(14, "gpio14"),
PINCTRL_PIN(15, "gpio15"),
PINCTRL_PIN(16, "oscio"),
};
static const struct sx150x_device_data sx1501q_device_data = {
.model = SX150X_123,
.reg_pullup = 0x02,
.reg_pulldn = 0x03,
.reg_dir = 0x01,
.reg_data = 0x00,
.reg_irq_mask = 0x05,
.reg_irq_src = 0x08,
.reg_sense = 0x07,
.pri.x123 = {
.reg_pld_mode = 0x10,
.reg_pld_table0 = 0x11,
.reg_pld_table2 = 0x13,
.reg_advanced = 0xad,
},
.ngpios = 4,
.pins = sx150x_4_pins,
.npins = 4, /* oscio not available */
};
static const struct sx150x_device_data sx1502q_device_data = {
.model = SX150X_123,
.reg_pullup = 0x02,
.reg_pulldn = 0x03,
.reg_dir = 0x01,
.reg_data = 0x00,
.reg_irq_mask = 0x05,
.reg_irq_src = 0x08,
.reg_sense = 0x06,
.pri.x123 = {
.reg_pld_mode = 0x10,
.reg_pld_table0 = 0x11,
.reg_pld_table1 = 0x12,
.reg_pld_table2 = 0x13,
.reg_pld_table3 = 0x14,
.reg_pld_table4 = 0x15,
.reg_advanced = 0xad,
},
.ngpios = 8,
.pins = sx150x_8_pins,
.npins = 8, /* oscio not available */
};
static const struct sx150x_device_data sx1503q_device_data = {
.model = SX150X_123,
.reg_pullup = 0x04,
.reg_pulldn = 0x06,
.reg_dir = 0x02,
.reg_data = 0x00,
.reg_irq_mask = 0x08,
.reg_irq_src = 0x0e,
.reg_sense = 0x0a,
.pri.x123 = {
.reg_pld_mode = 0x20,
.reg_pld_table0 = 0x22,
.reg_pld_table1 = 0x24,
.reg_pld_table2 = 0x26,
.reg_pld_table3 = 0x28,
.reg_pld_table4 = 0x2a,
.reg_advanced = 0xad,
},
.ngpios = 16,
.pins = sx150x_16_pins,
.npins = 16, /* oscio not available */
};
static const struct sx150x_device_data sx1504q_device_data = {
.model = SX150X_456,
.reg_pullup = 0x02,
.reg_pulldn = 0x03,
.reg_dir = 0x01,
.reg_data = 0x00,
.reg_irq_mask = 0x05,
.reg_irq_src = 0x08,
.reg_sense = 0x07,
.pri.x456 = {
.reg_pld_mode = 0x10,
.reg_pld_table0 = 0x11,
.reg_pld_table2 = 0x13,
},
.ngpios = 4,
.pins = sx150x_4_pins,
.npins = 4, /* oscio not available */
};
static const struct sx150x_device_data sx1505q_device_data = {
.model = SX150X_456,
.reg_pullup = 0x02,
.reg_pulldn = 0x03,
.reg_dir = 0x01,
.reg_data = 0x00,
.reg_irq_mask = 0x05,
.reg_irq_src = 0x08,
.reg_sense = 0x06,
.pri.x456 = {
.reg_pld_mode = 0x10,
.reg_pld_table0 = 0x11,
.reg_pld_table1 = 0x12,
.reg_pld_table2 = 0x13,
.reg_pld_table3 = 0x14,
.reg_pld_table4 = 0x15,
},
.ngpios = 8,
.pins = sx150x_8_pins,
.npins = 8, /* oscio not available */
};
static const struct sx150x_device_data sx1506q_device_data = {
.model = SX150X_456,
.reg_pullup = 0x04,
.reg_pulldn = 0x06,
.reg_dir = 0x02,
.reg_data = 0x00,
.reg_irq_mask = 0x08,
.reg_irq_src = 0x0e,
.reg_sense = 0x0a,
.pri.x456 = {
.reg_pld_mode = 0x20,
.reg_pld_table0 = 0x22,
.reg_pld_table1 = 0x24,
.reg_pld_table2 = 0x26,
.reg_pld_table3 = 0x28,
.reg_pld_table4 = 0x2a,
.reg_advanced = 0xad,
},
.ngpios = 16,
.pins = sx150x_16_pins,
.npins = 16, /* oscio not available */
};
static const struct sx150x_device_data sx1507q_device_data = {
.model = SX150X_789,
.reg_pullup = 0x03,
.reg_pulldn = 0x04,
.reg_dir = 0x07,
.reg_data = 0x08,
.reg_irq_mask = 0x09,
.reg_irq_src = 0x0b,
.reg_sense = 0x0a,
.pri.x789 = {
.reg_drain = 0x05,
.reg_polarity = 0x06,
.reg_clock = 0x0d,
.reg_misc = 0x0e,
.reg_reset = 0x7d,
},
.ngpios = 4,
.pins = sx150x_4_pins,
.npins = ARRAY_SIZE(sx150x_4_pins),
};
static const struct sx150x_device_data sx1508q_device_data = {
.model = SX150X_789,
.reg_pullup = 0x03,
.reg_pulldn = 0x04,
.reg_dir = 0x07,
.reg_data = 0x08,
.reg_irq_mask = 0x09,
.reg_irq_src = 0x0c,
.reg_sense = 0x0a,
.pri.x789 = {
.reg_drain = 0x05,
.reg_polarity = 0x06,
.reg_clock = 0x0f,
.reg_misc = 0x10,
.reg_reset = 0x7d,
},
.ngpios = 8,
.pins = sx150x_8_pins,
.npins = ARRAY_SIZE(sx150x_8_pins),
};
static const struct sx150x_device_data sx1509q_device_data = {
.model = SX150X_789,
.reg_pullup = 0x06,
.reg_pulldn = 0x08,
.reg_dir = 0x0e,
.reg_data = 0x10,
.reg_irq_mask = 0x12,
.reg_irq_src = 0x18,
.reg_sense = 0x14,
.pri.x789 = {
.reg_drain = 0x0a,
.reg_polarity = 0x0c,
.reg_clock = 0x1e,
.reg_misc = 0x1f,
.reg_reset = 0x7d,
},
.ngpios = 16,
.pins = sx150x_16_pins,
.npins = ARRAY_SIZE(sx150x_16_pins),
};
static int sx150x_pinctrl_get_groups_count(struct pinctrl_dev *pctldev)
{
return 0;
}
static const char *sx150x_pinctrl_get_group_name(struct pinctrl_dev *pctldev,
unsigned int group)
{
return NULL;
}
static int sx150x_pinctrl_get_group_pins(struct pinctrl_dev *pctldev,
unsigned int group,
const unsigned int **pins,
unsigned int *num_pins)
{
return -ENOTSUPP;
}
static const struct pinctrl_ops sx150x_pinctrl_ops = {
.get_groups_count = sx150x_pinctrl_get_groups_count,
.get_group_name = sx150x_pinctrl_get_group_name,
.get_group_pins = sx150x_pinctrl_get_group_pins,
#ifdef CONFIG_OF
.dt_node_to_map = pinconf_generic_dt_node_to_map_pin,
.dt_free_map = pinctrl_utils_free_map,
#endif
};
static bool sx150x_pin_is_oscio(struct sx150x_pinctrl *pctl, unsigned int pin)
{
if (pin >= pctl->data->npins)
return false;
/* OSCIO pin is only present in 789 devices */
if (pctl->data->model != SX150X_789)
return false;
return !strcmp(pctl->data->pins[pin].name, "oscio");
}
static int sx150x_gpio_get_direction(struct gpio_chip *chip,
unsigned int offset)
{
struct sx150x_pinctrl *pctl = gpiochip_get_data(chip);
unsigned int value;
int ret;
if (sx150x_pin_is_oscio(pctl, offset))
return false;
ret = regmap_read(pctl->regmap, pctl->data->reg_dir, &value);
if (ret < 0)
return ret;
return !!(value & BIT(offset));
}
static int sx150x_gpio_get(struct gpio_chip *chip, unsigned int offset)
{
struct sx150x_pinctrl *pctl = gpiochip_get_data(chip);
unsigned int value;
int ret;
if (sx150x_pin_is_oscio(pctl, offset))
return -EINVAL;
ret = regmap_read(pctl->regmap, pctl->data->reg_data, &value);
if (ret < 0)
return ret;
return !!(value & BIT(offset));
}
static int __sx150x_gpio_set(struct sx150x_pinctrl *pctl, unsigned int offset,
int value)
{
return regmap_write_bits(pctl->regmap, pctl->data->reg_data,
BIT(offset), value ? BIT(offset) : 0);
}
static int sx150x_gpio_oscio_set(struct sx150x_pinctrl *pctl,
int value)
{
return regmap_write(pctl->regmap,
pctl->data->pri.x789.reg_clock,
(value ? 0x1f : 0x10));
}
static void sx150x_gpio_set(struct gpio_chip *chip, unsigned int offset,
int value)
{
struct sx150x_pinctrl *pctl = gpiochip_get_data(chip);
if (sx150x_pin_is_oscio(pctl, offset))
sx150x_gpio_oscio_set(pctl, value);
else
__sx150x_gpio_set(pctl, offset, value);
}
static void sx150x_gpio_set_multiple(struct gpio_chip *chip,
unsigned long *mask,
unsigned long *bits)
{
struct sx150x_pinctrl *pctl = gpiochip_get_data(chip);
regmap_write_bits(pctl->regmap, pctl->data->reg_data, *mask, *bits);
}
static int sx150x_gpio_direction_input(struct gpio_chip *chip,
unsigned int offset)
{
struct sx150x_pinctrl *pctl = gpiochip_get_data(chip);
if (sx150x_pin_is_oscio(pctl, offset))
return -EINVAL;
return regmap_write_bits(pctl->regmap,
pctl->data->reg_dir,
BIT(offset), BIT(offset));
}
static int sx150x_gpio_direction_output(struct gpio_chip *chip,
unsigned int offset, int value)
{
struct sx150x_pinctrl *pctl = gpiochip_get_data(chip);
int ret;
if (sx150x_pin_is_oscio(pctl, offset))
return sx150x_gpio_oscio_set(pctl, value);
ret = __sx150x_gpio_set(pctl, offset, value);
if (ret < 0)
return ret;
return regmap_write_bits(pctl->regmap,
pctl->data->reg_dir,
BIT(offset), 0);
}
static void sx150x_irq_mask(struct irq_data *d)
{
struct sx150x_pinctrl *pctl =
gpiochip_get_data(irq_data_get_irq_chip_data(d));
unsigned int n = d->hwirq;
pctl->irq.masked |= BIT(n);
}
static void sx150x_irq_unmask(struct irq_data *d)
{
struct sx150x_pinctrl *pctl =
gpiochip_get_data(irq_data_get_irq_chip_data(d));
unsigned int n = d->hwirq;
pctl->irq.masked &= ~BIT(n);
}
static void sx150x_irq_set_sense(struct sx150x_pinctrl *pctl,
unsigned int line, unsigned int sense)
{
/*
* Every interrupt line is represented by two bits shifted
* proportionally to the line number
*/
const unsigned int n = line * 2;
const unsigned int mask = ~((SX150X_IRQ_TYPE_EDGE_RISING |
SX150X_IRQ_TYPE_EDGE_FALLING) << n);
pctl->irq.sense &= mask;
pctl->irq.sense |= sense << n;
}
static int sx150x_irq_set_type(struct irq_data *d, unsigned int flow_type)
{
struct sx150x_pinctrl *pctl =
gpiochip_get_data(irq_data_get_irq_chip_data(d));
unsigned int n, val = 0;
if (flow_type & (IRQ_TYPE_LEVEL_HIGH | IRQ_TYPE_LEVEL_LOW))
return -EINVAL;
n = d->hwirq;
if (flow_type & IRQ_TYPE_EDGE_RISING)
val |= SX150X_IRQ_TYPE_EDGE_RISING;
if (flow_type & IRQ_TYPE_EDGE_FALLING)
val |= SX150X_IRQ_TYPE_EDGE_FALLING;
sx150x_irq_set_sense(pctl, n, val);
return 0;
}
static irqreturn_t sx150x_irq_thread_fn(int irq, void *dev_id)
{
struct sx150x_pinctrl *pctl = (struct sx150x_pinctrl *)dev_id;
unsigned long n, status;
unsigned int val;
int err;
err = regmap_read(pctl->regmap, pctl->data->reg_irq_src, &val);
if (err < 0)
return IRQ_NONE;
err = regmap_write(pctl->regmap, pctl->data->reg_irq_src, val);
if (err < 0)
return IRQ_NONE;
status = val;
for_each_set_bit(n, &status, pctl->data->ngpios)
handle_nested_irq(irq_find_mapping(pctl->gpio.irqdomain, n));
return IRQ_HANDLED;
}
static void sx150x_irq_bus_lock(struct irq_data *d)
{
struct sx150x_pinctrl *pctl =
gpiochip_get_data(irq_data_get_irq_chip_data(d));
mutex_lock(&pctl->lock);
}
static void sx150x_irq_bus_sync_unlock(struct irq_data *d)
{
struct sx150x_pinctrl *pctl =
gpiochip_get_data(irq_data_get_irq_chip_data(d));
regmap_write(pctl->regmap, pctl->data->reg_irq_mask, pctl->irq.masked);
regmap_write(pctl->regmap, pctl->data->reg_sense, pctl->irq.sense);
mutex_unlock(&pctl->lock);
}
static int sx150x_pinconf_get(struct pinctrl_dev *pctldev, unsigned int pin,
unsigned long *config)
{
struct sx150x_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
unsigned int param = pinconf_to_config_param(*config);
int ret;
u32 arg;
unsigned int data;
if (sx150x_pin_is_oscio(pctl, pin)) {
switch (param) {
case PIN_CONFIG_DRIVE_PUSH_PULL:
case PIN_CONFIG_OUTPUT:
ret = regmap_read(pctl->regmap,
pctl->data->pri.x789.reg_clock,
&data);
if (ret < 0)
return ret;
if (param == PIN_CONFIG_DRIVE_PUSH_PULL)
arg = (data & 0x1f) ? 1 : 0;
else {
if ((data & 0x1f) == 0x1f)
arg = 1;
else if ((data & 0x1f) == 0x10)
arg = 0;
else
return -EINVAL;
}
break;
default:
return -ENOTSUPP;
}
goto out;
}
switch (param) {
case PIN_CONFIG_BIAS_PULL_DOWN:
ret = regmap_read(pctl->regmap,
pctl->data->reg_pulldn,
&data);
data &= BIT(pin);
if (ret < 0)
return ret;
if (!ret)
return -EINVAL;
arg = 1;
break;
case PIN_CONFIG_BIAS_PULL_UP:
ret = regmap_read(pctl->regmap,
pctl->data->reg_pullup,
&data);
data &= BIT(pin);
if (ret < 0)
return ret;
if (!ret)
return -EINVAL;
arg = 1;
break;
case PIN_CONFIG_DRIVE_OPEN_DRAIN:
if (pctl->data->model != SX150X_789)
return -ENOTSUPP;
ret = regmap_read(pctl->regmap,
pctl->data->pri.x789.reg_drain,
&data);
data &= BIT(pin);
if (ret < 0)
return ret;
if (!data)
return -EINVAL;
arg = 1;
break;
case PIN_CONFIG_DRIVE_PUSH_PULL:
if (pctl->data->model != SX150X_789)
arg = true;
else {
ret = regmap_read(pctl->regmap,
pctl->data->pri.x789.reg_drain,
&data);
data &= BIT(pin);
if (ret < 0)
return ret;
if (data)
return -EINVAL;
arg = 1;
}
break;
case PIN_CONFIG_OUTPUT:
ret = sx150x_gpio_get_direction(&pctl->gpio, pin);
if (ret < 0)
return ret;
if (ret)
return -EINVAL;
ret = sx150x_gpio_get(&pctl->gpio, pin);
if (ret < 0)
return ret;
arg = ret;
break;
default:
return -ENOTSUPP;
}
out:
*config = pinconf_to_config_packed(param, arg);
return 0;
}
static int sx150x_pinconf_set(struct pinctrl_dev *pctldev, unsigned int pin,
unsigned long *configs, unsigned int num_configs)
{
struct sx150x_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
enum pin_config_param param;
u32 arg;
int i;
int ret;
for (i = 0; i < num_configs; i++) {
param = pinconf_to_config_param(configs[i]);
arg = pinconf_to_config_argument(configs[i]);
if (sx150x_pin_is_oscio(pctl, pin)) {
if (param == PIN_CONFIG_OUTPUT) {
ret = sx150x_gpio_direction_output(&pctl->gpio,
pin, arg);
if (ret < 0)
return ret;
continue;
} else
return -ENOTSUPP;
}
switch (param) {
case PIN_CONFIG_BIAS_PULL_PIN_DEFAULT:
case PIN_CONFIG_BIAS_DISABLE:
ret = regmap_write_bits(pctl->regmap,
pctl->data->reg_pulldn,
BIT(pin), 0);
if (ret < 0)
return ret;
ret = regmap_write_bits(pctl->regmap,
pctl->data->reg_pullup,
BIT(pin), 0);
if (ret < 0)
return ret;
break;
case PIN_CONFIG_BIAS_PULL_UP:
ret = regmap_write_bits(pctl->regmap,
pctl->data->reg_pullup,
BIT(pin), BIT(pin));
if (ret < 0)
return ret;
break;
case PIN_CONFIG_BIAS_PULL_DOWN:
ret = regmap_write_bits(pctl->regmap,
pctl->data->reg_pulldn,
BIT(pin), BIT(pin));
if (ret < 0)
return ret;
break;
case PIN_CONFIG_DRIVE_OPEN_DRAIN:
if (pctl->data->model != SX150X_789 ||
sx150x_pin_is_oscio(pctl, pin))
return -ENOTSUPP;
ret = regmap_write_bits(pctl->regmap,
pctl->data->pri.x789.reg_drain,
BIT(pin), BIT(pin));
if (ret < 0)
return ret;
break;
case PIN_CONFIG_DRIVE_PUSH_PULL:
if (pctl->data->model != SX150X_789 ||
sx150x_pin_is_oscio(pctl, pin))
return 0;
ret = regmap_write_bits(pctl->regmap,
pctl->data->pri.x789.reg_drain,
BIT(pin), 0);
if (ret < 0)
return ret;
break;
case PIN_CONFIG_OUTPUT:
ret = sx150x_gpio_direction_output(&pctl->gpio,
pin, arg);
if (ret < 0)
return ret;
break;
default:
return -ENOTSUPP;
}
} /* for each config */
return 0;
}
static const struct pinconf_ops sx150x_pinconf_ops = {
.pin_config_get = sx150x_pinconf_get,
.pin_config_set = sx150x_pinconf_set,
.is_generic = true,
};
static const struct i2c_device_id sx150x_id[] = {
{"sx1501q", (kernel_ulong_t) &sx1501q_device_data },
{"sx1502q", (kernel_ulong_t) &sx1502q_device_data },
{"sx1503q", (kernel_ulong_t) &sx1503q_device_data },
{"sx1504q", (kernel_ulong_t) &sx1504q_device_data },
{"sx1505q", (kernel_ulong_t) &sx1505q_device_data },
{"sx1506q", (kernel_ulong_t) &sx1506q_device_data },
{"sx1507q", (kernel_ulong_t) &sx1507q_device_data },
{"sx1508q", (kernel_ulong_t) &sx1508q_device_data },
{"sx1509q", (kernel_ulong_t) &sx1509q_device_data },
{}
};
static const struct of_device_id sx150x_of_match[] = {
{ .compatible = "semtech,sx1501q", .data = &sx1501q_device_data },
{ .compatible = "semtech,sx1502q", .data = &sx1502q_device_data },
{ .compatible = "semtech,sx1503q", .data = &sx1503q_device_data },
{ .compatible = "semtech,sx1504q", .data = &sx1504q_device_data },
{ .compatible = "semtech,sx1505q", .data = &sx1505q_device_data },
{ .compatible = "semtech,sx1506q", .data = &sx1506q_device_data },
{ .compatible = "semtech,sx1507q", .data = &sx1507q_device_data },
{ .compatible = "semtech,sx1508q", .data = &sx1508q_device_data },
{ .compatible = "semtech,sx1509q", .data = &sx1509q_device_data },
{},
};
static int sx150x_reset(struct sx150x_pinctrl *pctl)
{
int err;
err = i2c_smbus_write_byte_data(pctl->client,
pctl->data->pri.x789.reg_reset,
SX150X_789_RESET_KEY1);
if (err < 0)
return err;
err = i2c_smbus_write_byte_data(pctl->client,
pctl->data->pri.x789.reg_reset,
SX150X_789_RESET_KEY2);
return err;
}
static int sx150x_init_misc(struct sx150x_pinctrl *pctl)
{
u8 reg, value;
switch (pctl->data->model) {
case SX150X_789:
reg = pctl->data->pri.x789.reg_misc;
value = SX150X_789_REG_MISC_AUTOCLEAR_OFF;
break;
case SX150X_456:
reg = pctl->data->pri.x456.reg_advanced;
value = 0x00;
/*
* Only SX1506 has RegAdvanced, SX1504/5 are expected
* to initialize this offset to zero
*/
if (!reg)
return 0;
break;
case SX150X_123:
reg = pctl->data->pri.x123.reg_advanced;
value = 0x00;
break;
default:
WARN(1, "Unknown chip model %d\n", pctl->data->model);
return -EINVAL;
}
return regmap_write(pctl->regmap, reg, value);
}
static int sx150x_init_hw(struct sx150x_pinctrl *pctl)
{
const u8 reg[] = {
[SX150X_789] = pctl->data->pri.x789.reg_polarity,
[SX150X_456] = pctl->data->pri.x456.reg_pld_mode,
[SX150X_123] = pctl->data->pri.x123.reg_pld_mode,
};
int err;
if (pctl->data->model == SX150X_789 &&
of_property_read_bool(pctl->dev->of_node, "semtech,probe-reset")) {
err = sx150x_reset(pctl);
if (err < 0)
return err;
}
err = sx150x_init_misc(pctl);
if (err < 0)
return err;
/* Set all pins to work in normal mode */
return regmap_write(pctl->regmap, reg[pctl->data->model], 0);
}
static int sx150x_regmap_reg_width(struct sx150x_pinctrl *pctl,
unsigned int reg)
{
const struct sx150x_device_data *data = pctl->data;
if (reg == data->reg_sense) {
/*
* RegSense packs two bits of configuration per GPIO,
* so we'd need to read twice as many bits as there
* are GPIO in our chip
*/
return 2 * data->ngpios;
} else if ((data->model == SX150X_789 &&
(reg == data->pri.x789.reg_misc ||
reg == data->pri.x789.reg_clock ||
reg == data->pri.x789.reg_reset))
||
(data->model == SX150X_123 &&
reg == data->pri.x123.reg_advanced)
||
(data->model == SX150X_456 &&
data->pri.x456.reg_advanced &&
reg == data->pri.x456.reg_advanced)) {
return 8;
} else {
return data->ngpios;
}
}
static unsigned int sx150x_maybe_swizzle(struct sx150x_pinctrl *pctl,
unsigned int reg, unsigned int val)
{
unsigned int a, b;
const struct sx150x_device_data *data = pctl->data;
/*
* Whereas SX1509 presents RegSense in a simple layout as such:
* reg [ f f e e d d c c ]
* reg + 1 [ b b a a 9 9 8 8 ]
* reg + 2 [ 7 7 6 6 5 5 4 4 ]
* reg + 3 [ 3 3 2 2 1 1 0 0 ]
*
* SX1503 and SX1506 deviate from that data layout, instead storing
* their contents as follows:
*
* reg [ f f e e d d c c ]
* reg + 1 [ 7 7 6 6 5 5 4 4 ]
* reg + 2 [ b b a a 9 9 8 8 ]
* reg + 3 [ 3 3 2 2 1 1 0 0 ]
*
* so, taking that into account, we swap two
* inner bytes of a 4-byte result
*/
if (reg == data->reg_sense &&
data->ngpios == 16 &&
(data->model == SX150X_123 ||
data->model == SX150X_456)) {
a = val & 0x00ff0000;
b = val & 0x0000ff00;
val &= 0xff0000ff;
val |= b << 8;
val |= a >> 8;
}
return val;
}
/*
* In order to mask the differences between 16 and 8 bit expander
* devices we set up a sligthly ficticious regmap that pretends to be
* a set of 32-bit (to accomodate RegSenseLow/RegSenseHigh
* pair/quartet) registers and transparently reconstructs those
* registers via multiple I2C/SMBus reads
*
* This way the rest of the driver code, interfacing with the chip via
* regmap API, can work assuming that each GPIO pin is represented by
* a group of bits at an offset proportional to GPIO number within a
* given register.
*/
static int sx150x_regmap_reg_read(void *context, unsigned int reg,
unsigned int *result)
{
int ret, n;
struct sx150x_pinctrl *pctl = context;
struct i2c_client *i2c = pctl->client;
const int width = sx150x_regmap_reg_width(pctl, reg);
unsigned int idx, val;
/*
* There are four potential cases covered by this function:
*
* 1) 8-pin chip, single configuration bit register
*
* This is trivial the code below just needs to read:
* reg [ 7 6 5 4 3 2 1 0 ]
*
* 2) 8-pin chip, double configuration bit register (RegSense)
*
* The read will be done as follows:
* reg [ 7 7 6 6 5 5 4 4 ]
* reg + 1 [ 3 3 2 2 1 1 0 0 ]
*
* 3) 16-pin chip, single configuration bit register
*
* The read will be done as follows:
* reg [ f e d c b a 9 8 ]
* reg + 1 [ 7 6 5 4 3 2 1 0 ]
*
* 4) 16-pin chip, double configuration bit register (RegSense)
*
* The read will be done as follows:
* reg [ f f e e d d c c ]
* reg + 1 [ b b a a 9 9 8 8 ]
* reg + 2 [ 7 7 6 6 5 5 4 4 ]
* reg + 3 [ 3 3 2 2 1 1 0 0 ]
*/
for (n = width, val = 0, idx = reg; n > 0; n -= 8, idx++) {
val <<= 8;
ret = i2c_smbus_read_byte_data(i2c, idx);
if (ret < 0)
return ret;
val |= ret;
}
*result = sx150x_maybe_swizzle(pctl, reg, val);
return 0;
}
static int sx150x_regmap_reg_write(void *context, unsigned int reg,
unsigned int val)
{
int ret, n;
struct sx150x_pinctrl *pctl = context;
struct i2c_client *i2c = pctl->client;
const int width = sx150x_regmap_reg_width(pctl, reg);
val = sx150x_maybe_swizzle(pctl, reg, val);
n = (width - 1) & ~7;
do {
const u8 byte = (val >> n) & 0xff;
ret = i2c_smbus_write_byte_data(i2c, reg, byte);
if (ret < 0)
return ret;
reg++;
n -= 8;
} while (n >= 0);
return 0;
}
static bool sx150x_reg_volatile(struct device *dev, unsigned int reg)
{
struct sx150x_pinctrl *pctl = i2c_get_clientdata(to_i2c_client(dev));
return reg == pctl->data->reg_irq_src || reg == pctl->data->reg_data;
}
const struct regmap_config sx150x_regmap_config = {
.reg_bits = 8,
.val_bits = 32,
.cache_type = REGCACHE_RBTREE,
.reg_read = sx150x_regmap_reg_read,
.reg_write = sx150x_regmap_reg_write,
.max_register = SX150X_MAX_REGISTER,
.volatile_reg = sx150x_reg_volatile,
};
static int sx150x_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
static const u32 i2c_funcs = I2C_FUNC_SMBUS_BYTE_DATA |
I2C_FUNC_SMBUS_WRITE_WORD_DATA;
struct device *dev = &client->dev;
struct sx150x_pinctrl *pctl;
int ret;
if (!i2c_check_functionality(client->adapter, i2c_funcs))
return -ENOSYS;
pctl = devm_kzalloc(dev, sizeof(*pctl), GFP_KERNEL);
if (!pctl)
return -ENOMEM;
i2c_set_clientdata(client, pctl);
pctl->dev = dev;
pctl->client = client;
if (dev->of_node)
pctl->data = of_device_get_match_data(dev);
else
pctl->data = (struct sx150x_device_data *)id->driver_data;
if (!pctl->data)
return -EINVAL;
pctl->regmap = devm_regmap_init(dev, NULL, pctl,
&sx150x_regmap_config);
if (IS_ERR(pctl->regmap)) {
ret = PTR_ERR(pctl->regmap);
dev_err(dev, "Failed to allocate register map: %d\n",
ret);
return ret;
}
mutex_init(&pctl->lock);
ret = sx150x_init_hw(pctl);
if (ret)
return ret;
/* Register GPIO controller */
pctl->gpio.label = devm_kstrdup(dev, client->name, GFP_KERNEL);
pctl->gpio.base = -1;
pctl->gpio.ngpio = pctl->data->npins;
pctl->gpio.get_direction = sx150x_gpio_get_direction;
pctl->gpio.direction_input = sx150x_gpio_direction_input;
pctl->gpio.direction_output = sx150x_gpio_direction_output;
pctl->gpio.get = sx150x_gpio_get;
pctl->gpio.set = sx150x_gpio_set;
pctl->gpio.set_config = gpiochip_generic_config;
pctl->gpio.parent = dev;
#ifdef CONFIG_OF_GPIO
pctl->gpio.of_node = dev->of_node;
#endif
pctl->gpio.can_sleep = true;
/*
* Setting multiple pins is not safe when all pins are not
* handled by the same regmap register. The oscio pin (present
* on the SX150X_789 chips) lives in its own register, so
* would require locking that is not in place at this time.
*/
if (pctl->data->model != SX150X_789)
pctl->gpio.set_multiple = sx150x_gpio_set_multiple;
ret = devm_gpiochip_add_data(dev, &pctl->gpio, pctl);
if (ret)
return ret;
/* Add Interrupt support if an irq is specified */
if (client->irq > 0) {
pctl->irq_chip.name = devm_kstrdup(dev, client->name,
GFP_KERNEL);
pctl->irq_chip.irq_mask = sx150x_irq_mask;
pctl->irq_chip.irq_unmask = sx150x_irq_unmask;
pctl->irq_chip.irq_set_type = sx150x_irq_set_type;
pctl->irq_chip.irq_bus_lock = sx150x_irq_bus_lock;
pctl->irq_chip.irq_bus_sync_unlock = sx150x_irq_bus_sync_unlock;
pctl->irq.masked = ~0;
pctl->irq.sense = 0;
/*
* Because sx150x_irq_threaded_fn invokes all of the
* nested interrrupt handlers via handle_nested_irq,
* any "handler" passed to gpiochip_irqchip_add()
* below is going to be ignored, so the choice of the
* function does not matter that much.
*
* We set it to handle_bad_irq to avoid confusion,
* plus it will be instantly noticeable if it is ever
* called (should not happen)
*/
ret = gpiochip_irqchip_add_nested(&pctl->gpio,
&pctl->irq_chip, 0,
handle_bad_irq, IRQ_TYPE_NONE);
if (ret) {
dev_err(dev, "could not connect irqchip to gpiochip\n");
return ret;
}
ret = devm_request_threaded_irq(dev, client->irq, NULL,
sx150x_irq_thread_fn,
IRQF_ONESHOT | IRQF_SHARED |
IRQF_TRIGGER_FALLING,
pctl->irq_chip.name, pctl);
if (ret < 0)
return ret;
gpiochip_set_nested_irqchip(&pctl->gpio,
&pctl->irq_chip,
client->irq);
}
/* Pinctrl_desc */
pctl->pinctrl_desc.name = "sx150x-pinctrl";
pctl->pinctrl_desc.pctlops = &sx150x_pinctrl_ops;
pctl->pinctrl_desc.confops = &sx150x_pinconf_ops;
pctl->pinctrl_desc.pins = pctl->data->pins;
pctl->pinctrl_desc.npins = pctl->data->npins;
pctl->pinctrl_desc.owner = THIS_MODULE;
pctl->pctldev = pinctrl_register(&pctl->pinctrl_desc, dev, pctl);
if (IS_ERR(pctl->pctldev)) {
dev_err(dev, "Failed to register pinctrl device\n");
return PTR_ERR(pctl->pctldev);
}
return 0;
}
static struct i2c_driver sx150x_driver = {
.driver = {
.name = "sx150x-pinctrl",
.of_match_table = of_match_ptr(sx150x_of_match),
},
.probe = sx150x_probe,
.id_table = sx150x_id,
};
static int __init sx150x_init(void)
{
return i2c_add_driver(&sx150x_driver);
}
subsys_initcall(sx150x_init);