// SPDX-License-Identifier: GPL-2.0-only /* * Copyright 2025 Bootlin * * Author: Kamel BOUHARA * Author: Mathieu Dubois-Briand */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #define MAX7360_GPIO_PORT 1 #define MAX7360_GPIO_COL 2 struct max7360_gpio_plat_data { unsigned int function; }; static struct max7360_gpio_plat_data max7360_gpio_port_plat = { .function = MAX7360_GPIO_PORT }; static struct max7360_gpio_plat_data max7360_gpio_col_plat = { .function = MAX7360_GPIO_COL }; static int max7360_get_available_gpos(struct device *dev, unsigned int *available_gpios) { u32 columns; int ret; ret = device_property_read_u32(dev->parent, "keypad,num-columns", &columns); if (ret) { dev_err(dev, "Failed to read columns count\n"); return ret; } *available_gpios = min(MAX7360_MAX_GPO, MAX7360_MAX_KEY_COLS - columns); return 0; } static int max7360_gpo_init_valid_mask(struct gpio_chip *gc, unsigned long *valid_mask, unsigned int ngpios) { unsigned int available_gpios; int ret; ret = max7360_get_available_gpos(gc->parent, &available_gpios); if (ret) return ret; bitmap_clear(valid_mask, 0, MAX7360_MAX_KEY_COLS - available_gpios); return 0; } static int max7360_set_gpos_count(struct device *dev, struct regmap *regmap) { /* * MAX7360 COL0 to COL7 pins can be used either as keypad columns, * general purpose output or a mix of both. * By default, all pins are used as keypad, here we update this * configuration to allow to use some of them as GPIOs. */ unsigned int available_gpios; unsigned int val; int ret; ret = max7360_get_available_gpos(dev, &available_gpios); if (ret) return ret; /* * Configure which GPIOs will be used for keypad. * MAX7360_REG_DEBOUNCE contains configuration both for keypad debounce * timings and gpos/keypad columns repartition. Only the later is * modified here. */ val = FIELD_PREP(MAX7360_PORTS, available_gpios); ret = regmap_write_bits(regmap, MAX7360_REG_DEBOUNCE, MAX7360_PORTS, val); if (ret) dev_err(dev, "Failed to write max7360 columns/gpos configuration"); return ret; } static int max7360_gpio_reg_mask_xlate(struct gpio_regmap *gpio, unsigned int base, unsigned int offset, unsigned int *reg, unsigned int *mask) { if (base == MAX7360_REG_PWMBASE) { /* * GPIO output is using PWM duty cycle registers: one register * per line, with value being either 0 or 255. */ *reg = base + offset; *mask = GENMASK(7, 0); } else { *reg = base; *mask = BIT(offset); } return 0; } static const struct regmap_irq max7360_regmap_irqs[MAX7360_MAX_GPIO] = { REGMAP_IRQ_REG(0, 0, BIT(0)), REGMAP_IRQ_REG(1, 0, BIT(1)), REGMAP_IRQ_REG(2, 0, BIT(2)), REGMAP_IRQ_REG(3, 0, BIT(3)), REGMAP_IRQ_REG(4, 0, BIT(4)), REGMAP_IRQ_REG(5, 0, BIT(5)), REGMAP_IRQ_REG(6, 0, BIT(6)), REGMAP_IRQ_REG(7, 0, BIT(7)), }; static int max7360_handle_mask_sync(const int index, const unsigned int mask_buf_def, const unsigned int mask_buf, void *const irq_drv_data) { struct regmap *regmap = irq_drv_data; int ret; for (unsigned int i = 0; i < MAX7360_MAX_GPIO; i++) { ret = regmap_assign_bits(regmap, MAX7360_REG_PWMCFG(i), MAX7360_PORT_CFG_INTERRUPT_MASK, mask_buf & BIT(i)); if (ret) return ret; } return 0; } static int max7360_gpio_probe(struct platform_device *pdev) { const struct max7360_gpio_plat_data *plat_data; struct gpio_regmap_config gpio_config = { }; struct regmap_irq_chip *irq_chip; struct device *dev = &pdev->dev; struct regmap *regmap; unsigned int outconf; int ret; regmap = dev_get_regmap(dev->parent, NULL); if (!regmap) return dev_err_probe(dev, -ENODEV, "could not get parent regmap\n"); plat_data = device_get_match_data(dev); if (plat_data->function == MAX7360_GPIO_PORT) { if (device_property_read_bool(dev, "interrupt-controller")) { /* * Port GPIOs with interrupt-controller property: add IRQ * controller. */ gpio_config.regmap_irq_flags = IRQF_ONESHOT | IRQF_SHARED; gpio_config.regmap_irq_line = fwnode_irq_get_byname(dev_fwnode(dev->parent), "inti"); if (gpio_config.regmap_irq_line < 0) return dev_err_probe(dev, gpio_config.regmap_irq_line, "Failed to get IRQ\n"); /* Create custom IRQ configuration. */ irq_chip = devm_kzalloc(dev, sizeof(*irq_chip), GFP_KERNEL); gpio_config.regmap_irq_chip = irq_chip; if (!irq_chip) return -ENOMEM; irq_chip->name = dev_name(dev); irq_chip->status_base = MAX7360_REG_GPIOIN; irq_chip->status_is_level = true; irq_chip->num_regs = 1; irq_chip->num_irqs = MAX7360_MAX_GPIO; irq_chip->irqs = max7360_regmap_irqs; irq_chip->handle_mask_sync = max7360_handle_mask_sync; irq_chip->irq_drv_data = regmap; for (unsigned int i = 0; i < MAX7360_MAX_GPIO; i++) { ret = regmap_write_bits(regmap, MAX7360_REG_PWMCFG(i), MAX7360_PORT_CFG_INTERRUPT_EDGES, MAX7360_PORT_CFG_INTERRUPT_EDGES); if (ret) return dev_err_probe(dev, ret, "Failed to enable interrupts\n"); } } /* * Port GPIOs: set output mode configuration (constant-current or not). * This property is optional. */ ret = device_property_read_u32(dev, "maxim,constant-current-disable", &outconf); if (!ret) { ret = regmap_write(regmap, MAX7360_REG_GPIOOUTM, outconf); if (ret) return dev_err_probe(dev, ret, "Failed to set constant-current configuration\n"); } } /* Add gpio device. */ gpio_config.parent = dev; gpio_config.regmap = regmap; if (plat_data->function == MAX7360_GPIO_PORT) { gpio_config.ngpio = MAX7360_MAX_GPIO; gpio_config.reg_dat_base = GPIO_REGMAP_ADDR(MAX7360_REG_GPIOIN); gpio_config.reg_set_base = GPIO_REGMAP_ADDR(MAX7360_REG_PWMBASE); gpio_config.reg_dir_out_base = GPIO_REGMAP_ADDR(MAX7360_REG_GPIOCTRL); gpio_config.ngpio_per_reg = MAX7360_MAX_GPIO; gpio_config.reg_mask_xlate = max7360_gpio_reg_mask_xlate; } else { ret = max7360_set_gpos_count(dev, regmap); if (ret) return dev_err_probe(dev, ret, "Failed to set GPOS pin count\n"); gpio_config.reg_set_base = GPIO_REGMAP_ADDR(MAX7360_REG_PORTS); gpio_config.ngpio = MAX7360_MAX_KEY_COLS; gpio_config.init_valid_mask = max7360_gpo_init_valid_mask; } return PTR_ERR_OR_ZERO(devm_gpio_regmap_register(dev, &gpio_config)); } static const struct of_device_id max7360_gpio_of_match[] = { { .compatible = "maxim,max7360-gpo", .data = &max7360_gpio_col_plat }, { .compatible = "maxim,max7360-gpio", .data = &max7360_gpio_port_plat }, { } }; MODULE_DEVICE_TABLE(of, max7360_gpio_of_match); static struct platform_driver max7360_gpio_driver = { .driver = { .name = "max7360-gpio", .of_match_table = max7360_gpio_of_match, }, .probe = max7360_gpio_probe, }; module_platform_driver(max7360_gpio_driver); MODULE_DESCRIPTION("MAX7360 GPIO driver"); MODULE_AUTHOR("Kamel BOUHARA "); MODULE_AUTHOR("Mathieu Dubois-Briand "); MODULE_LICENSE("GPL");