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linux/drivers/pinctrl/pinctrl-sx150x.c

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/*
* 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.irq.domain, 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;
}
static 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);
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