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// SPDX-License-Identifier: GPL-2.0-only
/*
* Maxim MAX7360 Core Driver
*
* Copyright 2025 Bootlin
*
* Authors:
* Kamel Bouhara <kamel.bouhara@bootlin.com>
* Mathieu Dubois-Briand <mathieu.dubois-briand@bootlin.com>
*/
#include <linux/array_size.h>
#include <linux/bits.h>
#include <linux/delay.h>
#include <linux/device/devres.h>
#include <linux/dev_printk.h>
#include <linux/err.h>
#include <linux/i2c.h>
#include <linux/interrupt.h>
#include <linux/mfd/core.h>
#include <linux/mfd/max7360.h>
#include <linux/mod_devicetable.h>
#include <linux/module.h>
#include <linux/regmap.h>
#include <linux/types.h>
static const struct mfd_cell max7360_cells[] = {
{ .name = "max7360-pinctrl" },
{ .name = "max7360-pwm" },
{ .name = "max7360-keypad" },
{ .name = "max7360-rotary" },
{
.name = "max7360-gpo",
.of_compatible = "maxim,max7360-gpo",
},
{
.name = "max7360-gpio",
.of_compatible = "maxim,max7360-gpio",
},
};
static const struct regmap_range max7360_volatile_ranges[] = {
regmap_reg_range(MAX7360_REG_KEYFIFO, MAX7360_REG_KEYFIFO),
regmap_reg_range(MAX7360_REG_I2C_TIMEOUT, MAX7360_REG_RTR_CNT),
};
static const struct regmap_access_table max7360_volatile_table = {
.yes_ranges = max7360_volatile_ranges,
.n_yes_ranges = ARRAY_SIZE(max7360_volatile_ranges),
};
static const struct regmap_config max7360_regmap_config = {
.reg_bits = 8,
.val_bits = 8,
.max_register = MAX7360_REG_PWMCFG(MAX7360_PORT_PWM_COUNT - 1),
.volatile_table = &max7360_volatile_table,
.cache_type = REGCACHE_MAPLE,
};
static int max7360_mask_irqs(struct regmap *regmap)
{
struct device *dev = regmap_get_device(regmap);
unsigned int val;
int ret;
/*
* GPIO/PWM interrupts are not masked on reset: as the MAX7360 "INTI"
* interrupt line is shared between GPIOs and rotary encoder, this could
* result in repeated spurious interrupts on the rotary encoder driver
* if the GPIO driver is not loaded. Mask them now to avoid this
* situation.
*/
for (unsigned int i = 0; i < MAX7360_PORT_PWM_COUNT; i++) {
ret = regmap_write_bits(regmap, MAX7360_REG_PWMCFG(i),
MAX7360_PORT_CFG_INTERRUPT_MASK,
MAX7360_PORT_CFG_INTERRUPT_MASK);
if (ret)
return dev_err_probe(dev, ret,
"Failed to write MAX7360 port configuration\n");
}
/* Read GPIO in register, to ACK any pending IRQ. */
ret = regmap_read(regmap, MAX7360_REG_GPIOIN, &val);
if (ret)
return dev_err_probe(dev, ret, "Failed to read GPIO values\n");
return 0;
}
static int max7360_reset(struct regmap *regmap)
{
struct device *dev = regmap_get_device(regmap);
int ret;
ret = regmap_write(regmap, MAX7360_REG_GPIOCFG, MAX7360_GPIO_CFG_GPIO_RST);
if (ret) {
dev_err(dev, "Failed to reset GPIO configuration: %x\n", ret);
return ret;
}
ret = regcache_drop_region(regmap, MAX7360_REG_GPIOCFG, MAX7360_REG_GPIO_LAST);
if (ret) {
dev_err(dev, "Failed to drop regmap cache: %x\n", ret);
return ret;
}
ret = regmap_write(regmap, MAX7360_REG_SLEEP, 0);
if (ret) {
dev_err(dev, "Failed to reset autosleep configuration: %x\n", ret);
return ret;
}
ret = regmap_write(regmap, MAX7360_REG_DEBOUNCE, 0);
if (ret)
dev_err(dev, "Failed to reset GPO port count: %x\n", ret);
return ret;
}
static int max7360_probe(struct i2c_client *client)
{
struct device *dev = &client->dev;
struct regmap *regmap;
int ret;
regmap = devm_regmap_init_i2c(client, &max7360_regmap_config);
if (IS_ERR(regmap))
return dev_err_probe(dev, PTR_ERR(regmap), "Failed to initialise regmap\n");
ret = max7360_reset(regmap);
if (ret)
return dev_err_probe(dev, ret, "Failed to reset device\n");
/* Get the device out of shutdown mode. */
ret = regmap_write_bits(regmap, MAX7360_REG_GPIOCFG,
MAX7360_GPIO_CFG_GPIO_EN,
MAX7360_GPIO_CFG_GPIO_EN);
if (ret)
return dev_err_probe(dev, ret, "Failed to enable GPIO and PWM module\n");
ret = max7360_mask_irqs(regmap);
if (ret)
return dev_err_probe(dev, ret, "Could not mask interrupts\n");
ret = devm_mfd_add_devices(dev, PLATFORM_DEVID_NONE,
max7360_cells, ARRAY_SIZE(max7360_cells),
NULL, 0, NULL);
if (ret)
return dev_err_probe(dev, ret, "Failed to register child devices\n");
return 0;
}
static const struct of_device_id max7360_dt_match[] = {
{ .compatible = "maxim,max7360" },
{}
};
MODULE_DEVICE_TABLE(of, max7360_dt_match);
static struct i2c_driver max7360_driver = {
.driver = {
.name = "max7360",
.of_match_table = max7360_dt_match,
},
.probe = max7360_probe,
};
module_i2c_driver(max7360_driver);
MODULE_DESCRIPTION("Maxim MAX7360 I2C IO Expander core driver");
MODULE_AUTHOR("Kamel Bouhara <kamel.bouhara@bootlin.com>");
MODULE_LICENSE("GPL");
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