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linuxdebug/drivers/pinctrl/pinctrl-cy8c95x0.c

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null pointer error
2024-07-16 15:50:57 +02:00
// SPDX-License-Identifier: GPL-2.0-only
/*
* CY8C95X0 20/40/60 pin I2C GPIO port expander with interrupt support
*
* Copyright (C) 2022 9elements GmbH
* Authors: Patrick Rudolph <patrick.rudolph@9elements.com>
* Naresh Solanki <Naresh.Solanki@9elements.com>
*/
#include <linux/acpi.h>
#include <linux/bitmap.h>
#include <linux/dmi.h>
#include <linux/gpio/driver.h>
#include <linux/gpio/consumer.h>
#include <linux/i2c.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/mod_devicetable.h>
#include <linux/module.h>
#include <linux/property.h>
#include <linux/regmap.h>
#include <linux/regulator/consumer.h>
#include <linux/pinctrl/pinctrl.h>
#include <linux/pinctrl/pinconf.h>
#include <linux/pinctrl/pinconf-generic.h>
#include <linux/pinctrl/pinmux.h>
/* Fast access registers */
#define CY8C95X0_INPUT 0x00
#define CY8C95X0_OUTPUT 0x08
#define CY8C95X0_INTSTATUS 0x10
#define CY8C95X0_INPUT_(x) (CY8C95X0_INPUT + (x))
#define CY8C95X0_OUTPUT_(x) (CY8C95X0_OUTPUT + (x))
#define CY8C95X0_INTSTATUS_(x) (CY8C95X0_INTSTATUS + (x))
/* Port Select configures the port */
#define CY8C95X0_PORTSEL 0x18
/* Port settings, write PORTSEL first */
#define CY8C95X0_INTMASK 0x19
#define CY8C95X0_PWMSEL 0x1A
#define CY8C95X0_INVERT 0x1B
#define CY8C95X0_DIRECTION 0x1C
/* Drive mode register change state on writing '1' */
#define CY8C95X0_DRV_PU 0x1D
#define CY8C95X0_DRV_PD 0x1E
#define CY8C95X0_DRV_ODH 0x1F
#define CY8C95X0_DRV_ODL 0x20
#define CY8C95X0_DRV_PP_FAST 0x21
#define CY8C95X0_DRV_PP_SLOW 0x22
#define CY8C95X0_DRV_HIZ 0x23
#define CY8C95X0_DEVID 0x2E
#define CY8C95X0_WATCHDOG 0x2F
#define CY8C95X0_COMMAND 0x30
#define CY8C95X0_PIN_TO_OFFSET(x) (((x) >= 20) ? ((x) + 4) : (x))
static const struct i2c_device_id cy8c95x0_id[] = {
{ "cy8c9520", 20, },
{ "cy8c9540", 40, },
{ "cy8c9560", 60, },
{ }
};
MODULE_DEVICE_TABLE(i2c, cy8c95x0_id);
#define OF_CY8C95X(__nrgpio) ((void *)(__nrgpio))
static const struct of_device_id cy8c95x0_dt_ids[] = {
{ .compatible = "cypress,cy8c9520", .data = OF_CY8C95X(20), },
{ .compatible = "cypress,cy8c9540", .data = OF_CY8C95X(40), },
{ .compatible = "cypress,cy8c9560", .data = OF_CY8C95X(60), },
{ }
};
MODULE_DEVICE_TABLE(of, cy8c95x0_dt_ids);
static const struct acpi_gpio_params cy8c95x0_irq_gpios = { 0, 0, true };
static const struct acpi_gpio_mapping cy8c95x0_acpi_irq_gpios[] = {
{ "irq-gpios", &cy8c95x0_irq_gpios, 1, ACPI_GPIO_QUIRK_ABSOLUTE_NUMBER },
{ }
};
static int cy8c95x0_acpi_get_irq(struct device *dev)
{
int ret;
ret = devm_acpi_dev_add_driver_gpios(dev, cy8c95x0_acpi_irq_gpios);
if (ret)
dev_warn(dev, "can't add GPIO ACPI mapping\n");
ret = acpi_dev_gpio_irq_get_by(ACPI_COMPANION(dev), "irq-gpios", 0);
if (ret < 0)
return ret;
dev_info(dev, "ACPI interrupt quirk (IRQ %d)\n", ret);
return ret;
}
static const struct dmi_system_id cy8c95x0_dmi_acpi_irq_info[] = {
{
/*
* On Intel Galileo Gen 1 board the IRQ pin is provided
* as an absolute number instead of being relative.
* Since first controller (gpio-sch.c) and second
* (gpio-dwapb.c) are at the fixed bases, we may safely
* refer to the number in the global space to get an IRQ
* out of it.
*/
.matches = {
DMI_EXACT_MATCH(DMI_BOARD_NAME, "Galileo"),
},
},
{}
};
#define MAX_BANK 8
#define BANK_SZ 8
#define MAX_LINE (MAX_BANK * BANK_SZ)
#define CY8C95X0_GPIO_MASK GENMASK(7, 0)
/**
* struct cy8c95x0_pinctrl - driver data
* @regmap: Device's regmap
* @irq_lock: IRQ bus lock
* @i2c_lock: Mutex for the device internal mux register
* @irq_mask: I/O bits affected by interrupts
* @irq_trig_raise: I/O bits affected by raising voltage level
* @irq_trig_fall: I/O bits affected by falling voltage level
* @irq_trig_low: I/O bits affected by a low voltage level
* @irq_trig_high: I/O bits affected by a high voltage level
* @push_pull: I/O bits configured as push pull driver
* @shiftmask: Mask used to compensate for Gport2 width
* @nport: Number of Gports in this chip
* @gpio_chip: gpiolib chip
* @driver_data: private driver data
* @regulator: Pointer to the regulator for the IC
* @dev: struct device
* @pctldev: pin controller device
* @pinctrl_desc: pin controller description
* @name: Chip controller name
* @tpin: Total number of pins
*/
struct cy8c95x0_pinctrl {
struct regmap *regmap;
struct mutex irq_lock;
struct mutex i2c_lock;
DECLARE_BITMAP(irq_mask, MAX_LINE);
DECLARE_BITMAP(irq_trig_raise, MAX_LINE);
DECLARE_BITMAP(irq_trig_fall, MAX_LINE);
DECLARE_BITMAP(irq_trig_low, MAX_LINE);
DECLARE_BITMAP(irq_trig_high, MAX_LINE);
DECLARE_BITMAP(push_pull, MAX_LINE);
DECLARE_BITMAP(shiftmask, MAX_LINE);
int nport;
struct gpio_chip gpio_chip;
unsigned long driver_data;
struct regulator *regulator;
struct device *dev;
struct pinctrl_dev *pctldev;
struct pinctrl_desc pinctrl_desc;
char name[32];
unsigned int tpin;
};
static const struct pinctrl_pin_desc cy8c9560_pins[] = {
PINCTRL_PIN(0, "gp00"),
PINCTRL_PIN(1, "gp01"),
PINCTRL_PIN(2, "gp02"),
PINCTRL_PIN(3, "gp03"),
PINCTRL_PIN(4, "gp04"),
PINCTRL_PIN(5, "gp05"),
PINCTRL_PIN(6, "gp06"),
PINCTRL_PIN(7, "gp07"),
PINCTRL_PIN(8, "gp10"),
PINCTRL_PIN(9, "gp11"),
PINCTRL_PIN(10, "gp12"),
PINCTRL_PIN(11, "gp13"),
PINCTRL_PIN(12, "gp14"),
PINCTRL_PIN(13, "gp15"),
PINCTRL_PIN(14, "gp16"),
PINCTRL_PIN(15, "gp17"),
PINCTRL_PIN(16, "gp20"),
PINCTRL_PIN(17, "gp21"),
PINCTRL_PIN(18, "gp22"),
PINCTRL_PIN(19, "gp23"),
PINCTRL_PIN(20, "gp30"),
PINCTRL_PIN(21, "gp31"),
PINCTRL_PIN(22, "gp32"),
PINCTRL_PIN(23, "gp33"),
PINCTRL_PIN(24, "gp34"),
PINCTRL_PIN(25, "gp35"),
PINCTRL_PIN(26, "gp36"),
PINCTRL_PIN(27, "gp37"),
PINCTRL_PIN(28, "gp40"),
PINCTRL_PIN(29, "gp41"),
PINCTRL_PIN(30, "gp42"),
PINCTRL_PIN(31, "gp43"),
PINCTRL_PIN(32, "gp44"),
PINCTRL_PIN(33, "gp45"),
PINCTRL_PIN(34, "gp46"),
PINCTRL_PIN(35, "gp47"),
PINCTRL_PIN(36, "gp50"),
PINCTRL_PIN(37, "gp51"),
PINCTRL_PIN(38, "gp52"),
PINCTRL_PIN(39, "gp53"),
PINCTRL_PIN(40, "gp54"),
PINCTRL_PIN(41, "gp55"),
PINCTRL_PIN(42, "gp56"),
PINCTRL_PIN(43, "gp57"),
PINCTRL_PIN(44, "gp60"),
PINCTRL_PIN(45, "gp61"),
PINCTRL_PIN(46, "gp62"),
PINCTRL_PIN(47, "gp63"),
PINCTRL_PIN(48, "gp64"),
PINCTRL_PIN(49, "gp65"),
PINCTRL_PIN(50, "gp66"),
PINCTRL_PIN(51, "gp67"),
PINCTRL_PIN(52, "gp70"),
PINCTRL_PIN(53, "gp71"),
PINCTRL_PIN(54, "gp72"),
PINCTRL_PIN(55, "gp73"),
PINCTRL_PIN(56, "gp74"),
PINCTRL_PIN(57, "gp75"),
PINCTRL_PIN(58, "gp76"),
PINCTRL_PIN(59, "gp77"),
};
static const char * const cy8c95x0_groups[] = {
"gp00",
"gp01",
"gp02",
"gp03",
"gp04",
"gp05",
"gp06",
"gp07",
"gp10",
"gp11",
"gp12",
"gp13",
"gp14",
"gp15",
"gp16",
"gp17",
"gp20",
"gp21",
"gp22",
"gp23",
"gp30",
"gp31",
"gp32",
"gp33",
"gp34",
"gp35",
"gp36",
"gp37",
"gp40",
"gp41",
"gp42",
"gp43",
"gp44",
"gp45",
"gp46",
"gp47",
"gp50",
"gp51",
"gp52",
"gp53",
"gp54",
"gp55",
"gp56",
"gp57",
"gp60",
"gp61",
"gp62",
"gp63",
"gp64",
"gp65",
"gp66",
"gp67",
"gp70",
"gp71",
"gp72",
"gp73",
"gp74",
"gp75",
"gp76",
"gp77",
};
static inline u8 cypress_get_port(struct cy8c95x0_pinctrl *chip, unsigned int pin)
{
/* Account for GPORT2 which only has 4 bits */
return CY8C95X0_PIN_TO_OFFSET(pin) / BANK_SZ;
}
static int cypress_get_pin_mask(struct cy8c95x0_pinctrl *chip, unsigned int pin)
{
/* Account for GPORT2 which only has 4 bits */
return BIT(CY8C95X0_PIN_TO_OFFSET(pin) % BANK_SZ);
}
static bool cy8c95x0_readable_register(struct device *dev, unsigned int reg)
{
switch (reg) {
case 0x24 ... 0x27:
return false;
default:
return true;
}
}
static bool cy8c95x0_writeable_register(struct device *dev, unsigned int reg)
{
switch (reg) {
case CY8C95X0_INPUT_(0) ... CY8C95X0_INPUT_(7):
return false;
case CY8C95X0_DEVID:
return false;
case 0x24 ... 0x27:
return false;
default:
return true;
}
}
static bool cy8c95x0_volatile_register(struct device *dev, unsigned int reg)
{
switch (reg) {
case CY8C95X0_INPUT_(0) ... CY8C95X0_INPUT_(7):
case CY8C95X0_INTSTATUS_(0) ... CY8C95X0_INTSTATUS_(7):
case CY8C95X0_INTMASK:
case CY8C95X0_INVERT:
case CY8C95X0_PWMSEL:
case CY8C95X0_DIRECTION:
case CY8C95X0_DRV_PU:
case CY8C95X0_DRV_PD:
case CY8C95X0_DRV_ODH:
case CY8C95X0_DRV_ODL:
case CY8C95X0_DRV_PP_FAST:
case CY8C95X0_DRV_PP_SLOW:
case CY8C95X0_DRV_HIZ:
return true;
default:
return false;
}
}
static bool cy8c95x0_precious_register(struct device *dev, unsigned int reg)
{
switch (reg) {
case CY8C95X0_INTSTATUS_(0) ... CY8C95X0_INTSTATUS_(7):
return true;
default:
return false;
}
}
static const struct reg_default cy8c95x0_reg_defaults[] = {
{ CY8C95X0_OUTPUT_(0), GENMASK(7, 0) },
{ CY8C95X0_OUTPUT_(1), GENMASK(7, 0) },
{ CY8C95X0_OUTPUT_(2), GENMASK(7, 0) },
{ CY8C95X0_OUTPUT_(3), GENMASK(7, 0) },
{ CY8C95X0_OUTPUT_(4), GENMASK(7, 0) },
{ CY8C95X0_OUTPUT_(5), GENMASK(7, 0) },
{ CY8C95X0_OUTPUT_(6), GENMASK(7, 0) },
{ CY8C95X0_OUTPUT_(7), GENMASK(7, 0) },
{ CY8C95X0_PORTSEL, 0 },
{ CY8C95X0_PWMSEL, 0 },
};
static const struct regmap_config cy8c95x0_i2c_regmap = {
.reg_bits = 8,
.val_bits = 8,
.reg_defaults = cy8c95x0_reg_defaults,
.num_reg_defaults = ARRAY_SIZE(cy8c95x0_reg_defaults),
.readable_reg = cy8c95x0_readable_register,
.writeable_reg = cy8c95x0_writeable_register,
.volatile_reg = cy8c95x0_volatile_register,
.precious_reg = cy8c95x0_precious_register,
.cache_type = REGCACHE_FLAT,
.max_register = CY8C95X0_COMMAND,
};
static int cy8c95x0_write_regs_mask(struct cy8c95x0_pinctrl *chip, int reg,
unsigned long *val, unsigned long *mask)
{
DECLARE_BITMAP(tmask, MAX_LINE);
DECLARE_BITMAP(tval, MAX_LINE);
int write_val;
int ret = 0;
int i, off = 0;
u8 bits;
/* Add the 4 bit gap of Gport2 */
bitmap_andnot(tmask, mask, chip->shiftmask, MAX_LINE);
bitmap_shift_left(tmask, tmask, 4, MAX_LINE);
bitmap_replace(tmask, tmask, mask, chip->shiftmask, BANK_SZ * 3);
bitmap_andnot(tval, val, chip->shiftmask, MAX_LINE);
bitmap_shift_left(tval, tval, 4, MAX_LINE);
bitmap_replace(tval, tval, val, chip->shiftmask, BANK_SZ * 3);
mutex_lock(&chip->i2c_lock);
for (i = 0; i < chip->nport; i++) {
/* Skip over unused banks */
bits = bitmap_get_value8(tmask, i * BANK_SZ);
if (!bits)
continue;
switch (reg) {
/* Muxed registers */
case CY8C95X0_INTMASK:
case CY8C95X0_PWMSEL:
case CY8C95X0_INVERT:
case CY8C95X0_DIRECTION:
case CY8C95X0_DRV_PU:
case CY8C95X0_DRV_PD:
case CY8C95X0_DRV_ODH:
case CY8C95X0_DRV_ODL:
case CY8C95X0_DRV_PP_FAST:
case CY8C95X0_DRV_PP_SLOW:
case CY8C95X0_DRV_HIZ:
ret = regmap_write(chip->regmap, CY8C95X0_PORTSEL, i);
if (ret < 0)
goto out;
off = reg;
break;
/* Direct access registers */
case CY8C95X0_INPUT:
case CY8C95X0_OUTPUT:
case CY8C95X0_INTSTATUS:
off = reg + i;
break;
default:
ret = -EINVAL;
goto out;
}
write_val = bitmap_get_value8(tval, i * BANK_SZ);
ret = regmap_update_bits(chip->regmap, off, bits, write_val);
if (ret < 0)
goto out;
}
out:
mutex_unlock(&chip->i2c_lock);
if (ret < 0)
dev_err(chip->dev, "failed writing register %d: err %d\n", off, ret);
return ret;
}
static int cy8c95x0_read_regs_mask(struct cy8c95x0_pinctrl *chip, int reg,
unsigned long *val, unsigned long *mask)
{
DECLARE_BITMAP(tmask, MAX_LINE);
DECLARE_BITMAP(tval, MAX_LINE);
DECLARE_BITMAP(tmp, MAX_LINE);
int read_val;
int ret = 0;
int i, off = 0;
u8 bits;
/* Add the 4 bit gap of Gport2 */
bitmap_andnot(tmask, mask, chip->shiftmask, MAX_LINE);
bitmap_shift_left(tmask, tmask, 4, MAX_LINE);
bitmap_replace(tmask, tmask, mask, chip->shiftmask, BANK_SZ * 3);
bitmap_andnot(tval, val, chip->shiftmask, MAX_LINE);
bitmap_shift_left(tval, tval, 4, MAX_LINE);
bitmap_replace(tval, tval, val, chip->shiftmask, BANK_SZ * 3);
mutex_lock(&chip->i2c_lock);
for (i = 0; i < chip->nport; i++) {
/* Skip over unused banks */
bits = bitmap_get_value8(tmask, i * BANK_SZ);
if (!bits)
continue;
switch (reg) {
/* Muxed registers */
case CY8C95X0_INTMASK:
case CY8C95X0_PWMSEL:
case CY8C95X0_INVERT:
case CY8C95X0_DIRECTION:
case CY8C95X0_DRV_PU:
case CY8C95X0_DRV_PD:
case CY8C95X0_DRV_ODH:
case CY8C95X0_DRV_ODL:
case CY8C95X0_DRV_PP_FAST:
case CY8C95X0_DRV_PP_SLOW:
case CY8C95X0_DRV_HIZ:
ret = regmap_write(chip->regmap, CY8C95X0_PORTSEL, i);
if (ret < 0)
goto out;
off = reg;
break;
/* Direct access registers */
case CY8C95X0_INPUT:
case CY8C95X0_OUTPUT:
case CY8C95X0_INTSTATUS:
off = reg + i;
break;
default:
ret = -EINVAL;
goto out;
}
ret = regmap_read(chip->regmap, off, &read_val);
if (ret < 0)
goto out;
read_val &= bits;
read_val |= bitmap_get_value8(tval, i * BANK_SZ) & ~bits;
bitmap_set_value8(tval, read_val, i * BANK_SZ);
}
/* Fill the 4 bit gap of Gport2 */
bitmap_shift_right(tmp, tval, 4, MAX_LINE);
bitmap_replace(val, tmp, tval, chip->shiftmask, MAX_LINE);
out:
mutex_unlock(&chip->i2c_lock);
if (ret < 0)
dev_err(chip->dev, "failed reading register %d: err %d\n", off, ret);
return ret;
}
static int cy8c95x0_gpio_direction_input(struct gpio_chip *gc, unsigned int off)
{
struct cy8c95x0_pinctrl *chip = gpiochip_get_data(gc);
u8 port = cypress_get_port(chip, off);
u8 bit = cypress_get_pin_mask(chip, off);
int ret;
mutex_lock(&chip->i2c_lock);
ret = regmap_write(chip->regmap, CY8C95X0_PORTSEL, port);
if (ret)
goto out;
ret = regmap_write_bits(chip->regmap, CY8C95X0_DIRECTION, bit, bit);
if (ret)
goto out;
if (test_bit(off, chip->push_pull)) {
/*
* Disable driving the pin by forcing it to HighZ. Only setting the
* direction register isn't sufficient in Push-Pull mode.
*/
ret = regmap_write_bits(chip->regmap, CY8C95X0_DRV_HIZ, bit, bit);
if (ret)
goto out;
__clear_bit(off, chip->push_pull);
}
out:
mutex_unlock(&chip->i2c_lock);
return ret;
}
static int cy8c95x0_gpio_direction_output(struct gpio_chip *gc,
unsigned int off, int val)
{
struct cy8c95x0_pinctrl *chip = gpiochip_get_data(gc);
u8 port = cypress_get_port(chip, off);
u8 outreg = CY8C95X0_OUTPUT_(port);
u8 bit = cypress_get_pin_mask(chip, off);
int ret;
/* Set output level */
ret = regmap_write_bits(chip->regmap, outreg, bit, val ? bit : 0);
if (ret)
return ret;
mutex_lock(&chip->i2c_lock);
/* Select port... */
ret = regmap_write(chip->regmap, CY8C95X0_PORTSEL, port);
if (ret)
goto out;
/* ...then direction */
ret = regmap_write_bits(chip->regmap, CY8C95X0_DIRECTION, bit, 0);
out:
mutex_unlock(&chip->i2c_lock);
return ret;
}
static int cy8c95x0_gpio_get_value(struct gpio_chip *gc, unsigned int off)
{
struct cy8c95x0_pinctrl *chip = gpiochip_get_data(gc);
u8 inreg = CY8C95X0_INPUT_(cypress_get_port(chip, off));
u8 bit = cypress_get_pin_mask(chip, off);
u32 reg_val;
int ret;
ret = regmap_read(chip->regmap, inreg, &reg_val);
if (ret < 0) {
/*
* NOTE:
* Diagnostic already emitted; that's all we should
* do unless gpio_*_value_cansleep() calls become different
* from their nonsleeping siblings (and report faults).
*/
return 0;
}
return !!(reg_val & bit);
}
static void cy8c95x0_gpio_set_value(struct gpio_chip *gc, unsigned int off,
int val)
{
struct cy8c95x0_pinctrl *chip = gpiochip_get_data(gc);
u8 outreg = CY8C95X0_OUTPUT_(cypress_get_port(chip, off));
u8 bit = cypress_get_pin_mask(chip, off);
regmap_write_bits(chip->regmap, outreg, bit, val ? bit : 0);
}
static int cy8c95x0_gpio_get_direction(struct gpio_chip *gc, unsigned int off)
{
struct cy8c95x0_pinctrl *chip = gpiochip_get_data(gc);
u8 port = cypress_get_port(chip, off);
u8 bit = cypress_get_pin_mask(chip, off);
u32 reg_val;
int ret;
mutex_lock(&chip->i2c_lock);
ret = regmap_write(chip->regmap, CY8C95X0_PORTSEL, port);
if (ret < 0)
goto out;
ret = regmap_read(chip->regmap, CY8C95X0_DIRECTION, &reg_val);
if (ret < 0)
goto out;
mutex_unlock(&chip->i2c_lock);
if (reg_val & bit)
return GPIO_LINE_DIRECTION_IN;
return GPIO_LINE_DIRECTION_OUT;
out:
mutex_unlock(&chip->i2c_lock);
return ret;
}
static int cy8c95x0_gpio_get_pincfg(struct cy8c95x0_pinctrl *chip,
unsigned int off,
unsigned long *config)
{
enum pin_config_param param = pinconf_to_config_param(*config);
u8 port = cypress_get_port(chip, off);
u8 bit = cypress_get_pin_mask(chip, off);
unsigned int reg;
u32 reg_val;
u16 arg = 0;
int ret;
mutex_lock(&chip->i2c_lock);
/* Select port */
ret = regmap_write(chip->regmap, CY8C95X0_PORTSEL, port);
if (ret < 0)
goto out;
switch (param) {
case PIN_CONFIG_BIAS_PULL_UP:
reg = CY8C95X0_DRV_PU;
break;
case PIN_CONFIG_BIAS_PULL_DOWN:
reg = CY8C95X0_DRV_PD;
break;
case PIN_CONFIG_BIAS_DISABLE:
reg = CY8C95X0_DRV_HIZ;
break;
case PIN_CONFIG_DRIVE_OPEN_DRAIN:
reg = CY8C95X0_DRV_ODL;
break;
case PIN_CONFIG_DRIVE_OPEN_SOURCE:
reg = CY8C95X0_DRV_ODH;
break;
case PIN_CONFIG_DRIVE_PUSH_PULL:
reg = CY8C95X0_DRV_PP_FAST;
break;
case PIN_CONFIG_INPUT_ENABLE:
reg = CY8C95X0_DIRECTION;
break;
case PIN_CONFIG_MODE_PWM:
reg = CY8C95X0_PWMSEL;
break;
case PIN_CONFIG_OUTPUT:
reg = CY8C95X0_OUTPUT_(port);
break;
case PIN_CONFIG_OUTPUT_ENABLE:
reg = CY8C95X0_DIRECTION;
break;
case PIN_CONFIG_BIAS_HIGH_IMPEDANCE:
case PIN_CONFIG_BIAS_BUS_HOLD:
case PIN_CONFIG_BIAS_PULL_PIN_DEFAULT:
case PIN_CONFIG_DRIVE_STRENGTH:
case PIN_CONFIG_DRIVE_STRENGTH_UA:
case PIN_CONFIG_INPUT_DEBOUNCE:
case PIN_CONFIG_INPUT_SCHMITT:
case PIN_CONFIG_INPUT_SCHMITT_ENABLE:
case PIN_CONFIG_MODE_LOW_POWER:
case PIN_CONFIG_PERSIST_STATE:
case PIN_CONFIG_POWER_SOURCE:
case PIN_CONFIG_SKEW_DELAY:
case PIN_CONFIG_SLEEP_HARDWARE_STATE:
case PIN_CONFIG_SLEW_RATE:
default:
ret = -ENOTSUPP;
goto out;
}
/*
* Writing 1 to one of the drive mode registers will automatically
* clear conflicting set bits in the other drive mode registers.
*/
ret = regmap_read(chip->regmap, reg, &reg_val);
if (reg_val & bit)
arg = 1;
*config = pinconf_to_config_packed(param, (u16)arg);
out:
mutex_unlock(&chip->i2c_lock);
return ret;
}
static int cy8c95x0_gpio_set_pincfg(struct cy8c95x0_pinctrl *chip,
unsigned int off,
unsigned long config)
{
u8 port = cypress_get_port(chip, off);
u8 bit = cypress_get_pin_mask(chip, off);
unsigned long param = pinconf_to_config_param(config);
unsigned int reg;
int ret;
mutex_lock(&chip->i2c_lock);
/* Select port */
ret = regmap_write(chip->regmap, CY8C95X0_PORTSEL, port);
if (ret < 0)
goto out;
switch (param) {
case PIN_CONFIG_BIAS_PULL_UP:
__clear_bit(off, chip->push_pull);
reg = CY8C95X0_DRV_PU;
break;
case PIN_CONFIG_BIAS_PULL_DOWN:
__clear_bit(off, chip->push_pull);
reg = CY8C95X0_DRV_PD;
break;
case PIN_CONFIG_BIAS_DISABLE:
__clear_bit(off, chip->push_pull);
reg = CY8C95X0_DRV_HIZ;
break;
case PIN_CONFIG_DRIVE_OPEN_DRAIN:
__clear_bit(off, chip->push_pull);
reg = CY8C95X0_DRV_ODL;
break;
case PIN_CONFIG_DRIVE_OPEN_SOURCE:
__clear_bit(off, chip->push_pull);
reg = CY8C95X0_DRV_ODH;
break;
case PIN_CONFIG_DRIVE_PUSH_PULL:
__set_bit(off, chip->push_pull);
reg = CY8C95X0_DRV_PP_FAST;
break;
case PIN_CONFIG_MODE_PWM:
reg = CY8C95X0_PWMSEL;
break;
default:
ret = -ENOTSUPP;
goto out;
}
/*
* Writing 1 to one of the drive mode registers will automatically
* clear conflicting set bits in the other drive mode registers.
*/
ret = regmap_write_bits(chip->regmap, reg, bit, bit);
out:
mutex_unlock(&chip->i2c_lock);
return ret;
}
static int cy8c95x0_gpio_get_multiple(struct gpio_chip *gc,
unsigned long *mask, unsigned long *bits)
{
struct cy8c95x0_pinctrl *chip = gpiochip_get_data(gc);
return cy8c95x0_read_regs_mask(chip, CY8C95X0_INPUT, bits, mask);
}
static void cy8c95x0_gpio_set_multiple(struct gpio_chip *gc,
unsigned long *mask, unsigned long *bits)
{
struct cy8c95x0_pinctrl *chip = gpiochip_get_data(gc);
cy8c95x0_write_regs_mask(chip, CY8C95X0_OUTPUT, bits, mask);
}
static int cy8c95x0_add_pin_ranges(struct gpio_chip *gc)
{
struct cy8c95x0_pinctrl *chip = gpiochip_get_data(gc);
struct device *dev = chip->dev;
int ret;
ret = gpiochip_add_pin_range(gc, dev_name(dev), 0, 0, chip->tpin);
if (ret)
dev_err(dev, "failed to add GPIO pin range\n");
return ret;
}
static int cy8c95x0_setup_gpiochip(struct cy8c95x0_pinctrl *chip)
{
struct gpio_chip *gc = &chip->gpio_chip;
gc->direction_input = cy8c95x0_gpio_direction_input;
gc->direction_output = cy8c95x0_gpio_direction_output;
gc->get = cy8c95x0_gpio_get_value;
gc->set = cy8c95x0_gpio_set_value;
gc->get_direction = cy8c95x0_gpio_get_direction;
gc->get_multiple = cy8c95x0_gpio_get_multiple;
gc->set_multiple = cy8c95x0_gpio_set_multiple;
gc->set_config = gpiochip_generic_config,
gc->can_sleep = true;
gc->add_pin_ranges = cy8c95x0_add_pin_ranges;
gc->base = -1;
gc->ngpio = chip->tpin;
gc->parent = chip->dev;
gc->owner = THIS_MODULE;
gc->names = NULL;
gc->label = dev_name(chip->dev);
return devm_gpiochip_add_data(chip->dev, gc, chip);
}
static void cy8c95x0_irq_mask(struct irq_data *d)
{
struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
struct cy8c95x0_pinctrl *chip = gpiochip_get_data(gc);
irq_hw_number_t hwirq = irqd_to_hwirq(d);
set_bit(hwirq, chip->irq_mask);
gpiochip_disable_irq(gc, hwirq);
}
static void cy8c95x0_irq_unmask(struct irq_data *d)
{
struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
struct cy8c95x0_pinctrl *chip = gpiochip_get_data(gc);
irq_hw_number_t hwirq = irqd_to_hwirq(d);
gpiochip_enable_irq(gc, hwirq);
clear_bit(hwirq, chip->irq_mask);
}
static void cy8c95x0_irq_bus_lock(struct irq_data *d)
{
struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
struct cy8c95x0_pinctrl *chip = gpiochip_get_data(gc);
mutex_lock(&chip->irq_lock);
}
static void cy8c95x0_irq_bus_sync_unlock(struct irq_data *d)
{
struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
struct cy8c95x0_pinctrl *chip = gpiochip_get_data(gc);
DECLARE_BITMAP(ones, MAX_LINE);
DECLARE_BITMAP(irq_mask, MAX_LINE);
DECLARE_BITMAP(reg_direction, MAX_LINE);
bitmap_fill(ones, MAX_LINE);
cy8c95x0_write_regs_mask(chip, CY8C95X0_INTMASK, chip->irq_mask, ones);
/* Switch direction to input if needed */
cy8c95x0_read_regs_mask(chip, CY8C95X0_DIRECTION, reg_direction, chip->irq_mask);
bitmap_or(irq_mask, chip->irq_mask, reg_direction, MAX_LINE);
bitmap_complement(irq_mask, irq_mask, MAX_LINE);
/* Look for any newly setup interrupt */
cy8c95x0_write_regs_mask(chip, CY8C95X0_DIRECTION, ones, irq_mask);
mutex_unlock(&chip->irq_lock);
}
static int cy8c95x0_irq_set_type(struct irq_data *d, unsigned int type)
{
struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
struct cy8c95x0_pinctrl *chip = gpiochip_get_data(gc);
irq_hw_number_t hwirq = irqd_to_hwirq(d);
unsigned int trig_type;
switch (type) {
case IRQ_TYPE_EDGE_RISING:
case IRQ_TYPE_EDGE_FALLING:
case IRQ_TYPE_EDGE_BOTH:
trig_type = type;
break;
case IRQ_TYPE_LEVEL_HIGH:
trig_type = IRQ_TYPE_EDGE_RISING;
break;
case IRQ_TYPE_LEVEL_LOW:
trig_type = IRQ_TYPE_EDGE_FALLING;
break;
default:
dev_err(chip->dev, "irq %d: unsupported type %d\n", d->irq, type);
return -EINVAL;
}
assign_bit(hwirq, chip->irq_trig_fall, trig_type & IRQ_TYPE_EDGE_FALLING);
assign_bit(hwirq, chip->irq_trig_raise, trig_type & IRQ_TYPE_EDGE_RISING);
assign_bit(hwirq, chip->irq_trig_low, type == IRQ_TYPE_LEVEL_LOW);
assign_bit(hwirq, chip->irq_trig_high, type == IRQ_TYPE_LEVEL_HIGH);
return 0;
}
static void cy8c95x0_irq_shutdown(struct irq_data *d)
{
struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
struct cy8c95x0_pinctrl *chip = gpiochip_get_data(gc);
irq_hw_number_t hwirq = irqd_to_hwirq(d);
clear_bit(hwirq, chip->irq_trig_raise);
clear_bit(hwirq, chip->irq_trig_fall);
clear_bit(hwirq, chip->irq_trig_low);
clear_bit(hwirq, chip->irq_trig_high);
}
static const struct irq_chip cy8c95x0_irqchip = {
.name = "cy8c95x0-irq",
.irq_mask = cy8c95x0_irq_mask,
.irq_unmask = cy8c95x0_irq_unmask,
.irq_bus_lock = cy8c95x0_irq_bus_lock,
.irq_bus_sync_unlock = cy8c95x0_irq_bus_sync_unlock,
.irq_set_type = cy8c95x0_irq_set_type,
.irq_shutdown = cy8c95x0_irq_shutdown,
.flags = IRQCHIP_IMMUTABLE,
GPIOCHIP_IRQ_RESOURCE_HELPERS,
};
static bool cy8c95x0_irq_pending(struct cy8c95x0_pinctrl *chip, unsigned long *pending)
{
DECLARE_BITMAP(ones, MAX_LINE);
DECLARE_BITMAP(cur_stat, MAX_LINE);
DECLARE_BITMAP(new_stat, MAX_LINE);
DECLARE_BITMAP(trigger, MAX_LINE);
bitmap_fill(ones, MAX_LINE);
/* Read the current interrupt status from the device */
if (cy8c95x0_read_regs_mask(chip, CY8C95X0_INTSTATUS, trigger, ones))
return false;
/* Check latched inputs */
if (cy8c95x0_read_regs_mask(chip, CY8C95X0_INPUT, cur_stat, trigger))
return false;
/* Apply filter for rising/falling edge selection */
bitmap_replace(new_stat, chip->irq_trig_fall, chip->irq_trig_raise,
cur_stat, MAX_LINE);
bitmap_and(pending, new_stat, trigger, MAX_LINE);
return !bitmap_empty(pending, MAX_LINE);
}
static irqreturn_t cy8c95x0_irq_handler(int irq, void *devid)
{
struct cy8c95x0_pinctrl *chip = devid;
struct gpio_chip *gc = &chip->gpio_chip;
DECLARE_BITMAP(pending, MAX_LINE);
int nested_irq, level;
bool ret;
ret = cy8c95x0_irq_pending(chip, pending);
if (!ret)
return IRQ_RETVAL(0);
ret = 0;
for_each_set_bit(level, pending, MAX_LINE) {
/* Already accounted for 4bit gap in GPort2 */
nested_irq = irq_find_mapping(gc->irq.domain, level);
if (unlikely(nested_irq <= 0)) {
dev_warn_ratelimited(gc->parent, "unmapped interrupt %d\n", level);
continue;
}
if (test_bit(level, chip->irq_trig_low))
while (!cy8c95x0_gpio_get_value(gc, level))
handle_nested_irq(nested_irq);
else if (test_bit(level, chip->irq_trig_high))
while (cy8c95x0_gpio_get_value(gc, level))
handle_nested_irq(nested_irq);
else
handle_nested_irq(nested_irq);
ret = 1;
}
return IRQ_RETVAL(ret);
}
static int cy8c95x0_pinctrl_get_groups_count(struct pinctrl_dev *pctldev)
{
struct cy8c95x0_pinctrl *chip = pinctrl_dev_get_drvdata(pctldev);
return chip->tpin;
}
static const char *cy8c95x0_pinctrl_get_group_name(struct pinctrl_dev *pctldev,
unsigned int group)
{
return cy8c95x0_groups[group];
}
static int cy8c95x0_pinctrl_get_group_pins(struct pinctrl_dev *pctldev,
unsigned int group,
const unsigned int **pins,
unsigned int *num_pins)
{
*pins = &cy8c9560_pins[group].number;
*num_pins = 1;
return 0;
}
static const char *cy8c95x0_get_fname(unsigned int selector)
{
if (selector == 0)
return "gpio";
else
return "pwm";
}
static void cy8c95x0_pin_dbg_show(struct pinctrl_dev *pctldev, struct seq_file *s,
unsigned int pin)
{
struct cy8c95x0_pinctrl *chip = pinctrl_dev_get_drvdata(pctldev);
DECLARE_BITMAP(mask, MAX_LINE);
DECLARE_BITMAP(pwm, MAX_LINE);
bitmap_zero(mask, MAX_LINE);
__set_bit(pin, mask);
if (cy8c95x0_read_regs_mask(chip, CY8C95X0_PWMSEL, pwm, mask)) {
seq_puts(s, "not available");
return;
}
seq_printf(s, "MODE:%s", cy8c95x0_get_fname(test_bit(pin, pwm)));
}
static const struct pinctrl_ops cy8c95x0_pinctrl_ops = {
.get_groups_count = cy8c95x0_pinctrl_get_groups_count,
.get_group_name = cy8c95x0_pinctrl_get_group_name,
.get_group_pins = cy8c95x0_pinctrl_get_group_pins,
#ifdef CONFIG_OF
.dt_node_to_map = pinconf_generic_dt_node_to_map_pin,
.dt_free_map = pinconf_generic_dt_free_map,
#endif
.pin_dbg_show = cy8c95x0_pin_dbg_show,
};
static const char *cy8c95x0_get_function_name(struct pinctrl_dev *pctldev, unsigned int selector)
{
return cy8c95x0_get_fname(selector);
}
static int cy8c95x0_get_functions_count(struct pinctrl_dev *pctldev)
{
return 2;
}
static int cy8c95x0_get_function_groups(struct pinctrl_dev *pctldev, unsigned int selector,
const char * const **groups,
unsigned int * const num_groups)
{
struct cy8c95x0_pinctrl *chip = pinctrl_dev_get_drvdata(pctldev);
*groups = cy8c95x0_groups;
*num_groups = chip->tpin;
return 0;
}
static int cy8c95x0_pinmux_cfg(struct cy8c95x0_pinctrl *chip,
unsigned int val,
unsigned long off)
{
u8 port = cypress_get_port(chip, off);
u8 bit = cypress_get_pin_mask(chip, off);
int ret;
/* Select port */
ret = regmap_write(chip->regmap, CY8C95X0_PORTSEL, port);
if (ret < 0)
return ret;
ret = regmap_write_bits(chip->regmap, CY8C95X0_PWMSEL, bit, val ? bit : 0);
if (ret < 0)
return ret;
/* Set direction to output & set output to 1 so that PWM can work */
ret = regmap_write_bits(chip->regmap, CY8C95X0_DIRECTION, bit, bit);
if (ret < 0)
return ret;
return regmap_write_bits(chip->regmap, CY8C95X0_OUTPUT_(port), bit, bit);
}
static int cy8c95x0_set_mux(struct pinctrl_dev *pctldev, unsigned int selector,
unsigned int group)
{
struct cy8c95x0_pinctrl *chip = pinctrl_dev_get_drvdata(pctldev);
int ret;
mutex_lock(&chip->i2c_lock);
ret = cy8c95x0_pinmux_cfg(chip, selector, group);
mutex_unlock(&chip->i2c_lock);
return ret;
}
static const struct pinmux_ops cy8c95x0_pmxops = {
.get_functions_count = cy8c95x0_get_functions_count,
.get_function_name = cy8c95x0_get_function_name,
.get_function_groups = cy8c95x0_get_function_groups,
.set_mux = cy8c95x0_set_mux,
.strict = true,
};
static int cy8c95x0_pinconf_get(struct pinctrl_dev *pctldev, unsigned int pin,
unsigned long *config)
{
struct cy8c95x0_pinctrl *chip = pinctrl_dev_get_drvdata(pctldev);
return cy8c95x0_gpio_get_pincfg(chip, pin, config);
}
static int cy8c95x0_pinconf_set(struct pinctrl_dev *pctldev, unsigned int pin,
unsigned long *configs, unsigned int num_configs)
{
struct cy8c95x0_pinctrl *chip = pinctrl_dev_get_drvdata(pctldev);
int ret = 0;
int i;
for (i = 0; i < num_configs; i++) {
ret = cy8c95x0_gpio_set_pincfg(chip, pin, configs[i]);
if (ret)
return ret;
}
return ret;
}
static const struct pinconf_ops cy8c95x0_pinconf_ops = {
.pin_config_get = cy8c95x0_pinconf_get,
.pin_config_set = cy8c95x0_pinconf_set,
.is_generic = true,
};
static int cy8c95x0_irq_setup(struct cy8c95x0_pinctrl *chip, int irq)
{
struct gpio_irq_chip *girq = &chip->gpio_chip.irq;
DECLARE_BITMAP(pending_irqs, MAX_LINE);
int ret;
mutex_init(&chip->irq_lock);
bitmap_zero(pending_irqs, MAX_LINE);
/* Read IRQ status register to clear all pending interrupts */
ret = cy8c95x0_irq_pending(chip, pending_irqs);
if (ret) {
dev_err(chip->dev, "failed to clear irq status register\n");
return ret;
}
/* Mask all interrupts */
bitmap_fill(chip->irq_mask, MAX_LINE);
gpio_irq_chip_set_chip(girq, &cy8c95x0_irqchip);
/* This will let us handle the parent IRQ in the driver */
girq->parent_handler = NULL;
girq->num_parents = 0;
girq->parents = NULL;
girq->default_type = IRQ_TYPE_NONE;
girq->handler = handle_simple_irq;
girq->threaded = true;
ret = devm_request_threaded_irq(chip->dev, irq,
NULL, cy8c95x0_irq_handler,
IRQF_ONESHOT | IRQF_SHARED | IRQF_TRIGGER_HIGH,
dev_name(chip->dev), chip);
if (ret) {
dev_err(chip->dev, "failed to request irq %d\n", irq);
return ret;
}
dev_info(chip->dev, "Registered threaded IRQ\n");
return 0;
}
static int cy8c95x0_setup_pinctrl(struct cy8c95x0_pinctrl *chip)
{
struct pinctrl_desc *pd = &chip->pinctrl_desc;
pd->pctlops = &cy8c95x0_pinctrl_ops;
pd->confops = &cy8c95x0_pinconf_ops;
pd->pmxops = &cy8c95x0_pmxops;
pd->name = dev_name(chip->dev);
pd->pins = cy8c9560_pins;
pd->npins = chip->tpin;
pd->owner = THIS_MODULE;
chip->pctldev = devm_pinctrl_register(chip->dev, pd, chip);
if (IS_ERR(chip->pctldev))
return dev_err_probe(chip->dev, PTR_ERR(chip->pctldev),
"can't register controller\n");
return 0;
}
static int cy8c95x0_detect(struct i2c_client *client,
struct i2c_board_info *info)
{
struct i2c_adapter *adapter = client->adapter;
int ret;
const char *name;
if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
return -ENODEV;
ret = i2c_smbus_read_byte_data(client, CY8C95X0_DEVID);
if (ret < 0)
return ret;
switch (ret & GENMASK(7, 4)) {
case 0x20:
name = cy8c95x0_id[0].name;
break;
case 0x40:
name = cy8c95x0_id[1].name;
break;
case 0x60:
name = cy8c95x0_id[2].name;
break;
default:
return -ENODEV;
}
dev_info(&client->dev, "Found a %s chip at 0x%02x.\n", name, client->addr);
strscpy(info->type, name, I2C_NAME_SIZE);
return 0;
}
static int cy8c95x0_probe(struct i2c_client *client)
{
struct cy8c95x0_pinctrl *chip;
struct regulator *reg;
int ret;
chip = devm_kzalloc(&client->dev, sizeof(*chip), GFP_KERNEL);
if (!chip)
return -ENOMEM;
chip->dev = &client->dev;
/* Set the device type */
chip->driver_data = (unsigned long)device_get_match_data(&client->dev);
if (!chip->driver_data)
chip->driver_data = i2c_match_id(cy8c95x0_id, client)->driver_data;
if (!chip->driver_data)
return -ENODEV;
i2c_set_clientdata(client, chip);
chip->tpin = chip->driver_data & CY8C95X0_GPIO_MASK;
chip->nport = DIV_ROUND_UP(CY8C95X0_PIN_TO_OFFSET(chip->tpin), BANK_SZ);
switch (chip->tpin) {
case 20:
strscpy(chip->name, cy8c95x0_id[0].name, I2C_NAME_SIZE);
break;
case 40:
strscpy(chip->name, cy8c95x0_id[1].name, I2C_NAME_SIZE);
break;
case 60:
strscpy(chip->name, cy8c95x0_id[2].name, I2C_NAME_SIZE);
break;
default:
return -ENODEV;
}
reg = devm_regulator_get(&client->dev, "vdd");
if (IS_ERR(reg)) {
if (PTR_ERR(reg) == -EPROBE_DEFER)
return -EPROBE_DEFER;
} else {
ret = regulator_enable(reg);
if (ret) {
dev_err(&client->dev, "failed to enable regulator vdd: %d\n", ret);
return ret;
}
chip->regulator = reg;
}
chip->regmap = devm_regmap_init_i2c(client, &cy8c95x0_i2c_regmap);
if (IS_ERR(chip->regmap)) {
ret = PTR_ERR(chip->regmap);
goto err_exit;
}
bitmap_zero(chip->push_pull, MAX_LINE);
bitmap_zero(chip->shiftmask, MAX_LINE);
bitmap_set(chip->shiftmask, 0, 20);
mutex_init(&chip->i2c_lock);
if (dmi_first_match(cy8c95x0_dmi_acpi_irq_info)) {
ret = cy8c95x0_acpi_get_irq(&client->dev);
if (ret > 0)
client->irq = ret;
}
if (client->irq) {
ret = cy8c95x0_irq_setup(chip, client->irq);
if (ret)
goto err_exit;
}
ret = cy8c95x0_setup_pinctrl(chip);
if (ret)
goto err_exit;
ret = cy8c95x0_setup_gpiochip(chip);
if (ret)
goto err_exit;
return 0;
err_exit:
if (!IS_ERR_OR_NULL(chip->regulator))
regulator_disable(chip->regulator);
return ret;
}
static void cy8c95x0_remove(struct i2c_client *client)
{
struct cy8c95x0_pinctrl *chip = i2c_get_clientdata(client);
if (!IS_ERR_OR_NULL(chip->regulator))
regulator_disable(chip->regulator);
}
static const struct acpi_device_id cy8c95x0_acpi_ids[] = {
{ "INT3490", 40, },
{ }
};
MODULE_DEVICE_TABLE(acpi, cy8c95x0_acpi_ids);
static struct i2c_driver cy8c95x0_driver = {
.driver = {
.name = "cy8c95x0-pinctrl",
.of_match_table = cy8c95x0_dt_ids,
.acpi_match_table = cy8c95x0_acpi_ids,
},
.probe_new = cy8c95x0_probe,
.remove = cy8c95x0_remove,
.id_table = cy8c95x0_id,
.detect = cy8c95x0_detect,
};
module_i2c_driver(cy8c95x0_driver);
MODULE_AUTHOR("Patrick Rudolph <patrick.rudolph@9elements.com>");
MODULE_AUTHOR("Naresh Solanki <naresh.solanki@9elements.com>");
MODULE_DESCRIPTION("Pinctrl driver for CY8C95X0");
MODULE_LICENSE("GPL");