// SPDX-License-Identifier: GPL-2.0+ /* * Access to GPIOs on TWL4030/TPS659x0 chips * * Copyright (C) 2006-2007 Texas Instruments, Inc. * Copyright (C) 2006 MontaVista Software, Inc. * * Code re-arranged and cleaned up by: * Syed Mohammed Khasim <[email protected]> * * Initial Code: * Andy Lowe / Nishanth Menon */ #include <linux/module.h> #include <linux/init.h> #include <linux/interrupt.h> #include <linux/kthread.h> #include <linux/irq.h> #include <linux/gpio/machine.h> #include <linux/gpio/driver.h> #include <linux/gpio/consumer.h> #include <linux/platform_device.h> #include <linux/of.h> #include <linux/irqdomain.h> #include <linux/mfd/twl.h> /* * The GPIO "subchip" supports 18 GPIOs which can be configured as * inputs or outputs, with pullups or pulldowns on each pin. Each * GPIO can trigger interrupts on either or both edges. * * GPIO interrupts can be fed to either of two IRQ lines; this is * intended to support multiple hosts. * * There are also two LED pins used sometimes as output-only GPIOs. */ /* genirq interfaces are not available to modules */ #ifdef MODULE #define is_module … #else #define is_module() … #endif /* GPIO_CTRL Fields */ #define MASK_GPIO_CTRL_GPIO0CD1 … #define MASK_GPIO_CTRL_GPIO1CD2 … #define MASK_GPIO_CTRL_GPIO_ON … /* Mask for GPIO registers when aggregated into a 32-bit integer */ #define GPIO_32_MASK … struct gpio_twl4030_priv { … }; /*----------------------------------------------------------------------*/ /* * To configure TWL4030 GPIO module registers */ static inline int gpio_twl4030_write(u8 address, u8 data) { … } /*----------------------------------------------------------------------*/ /* * LED register offsets from TWL_MODULE_LED base * PWMs A and B are dedicated to LEDs A and B, respectively. */ #define TWL4030_LED_LEDEN_REG … #define TWL4030_PWMAON_REG … #define TWL4030_PWMAOFF_REG … #define TWL4030_PWMBON_REG … #define TWL4030_PWMBOFF_REG … /* LEDEN bits */ #define LEDEN_LEDAON … #define LEDEN_LEDBON … #define LEDEN_LEDAEXT … #define LEDEN_LEDBEXT … #define LEDEN_LEDAPWM … #define LEDEN_LEDBPWM … #define LEDEN_PWM_LENGTHA … #define LEDEN_PWM_LENGTHB … #define PWMxON_LENGTH … /*----------------------------------------------------------------------*/ /* * To read a TWL4030 GPIO module register */ static inline int gpio_twl4030_read(u8 address) { … } /*----------------------------------------------------------------------*/ static u8 cached_leden; /* The LED lines are open drain outputs ... a FET pulls to GND, so an * external pullup is needed. We could also expose the integrated PWM * as a LED brightness control; we initialize it as "always on". */ static void twl4030_led_set_value(int led, int value) { … } static int twl4030_set_gpio_direction(int gpio, int is_input) { … } static int twl4030_get_gpio_direction(int gpio) { … } static int twl4030_set_gpio_dataout(int gpio, int enable) { … } static int twl4030_get_gpio_datain(int gpio) { … } /*----------------------------------------------------------------------*/ static int twl_request(struct gpio_chip *chip, unsigned offset) { … } static void twl_free(struct gpio_chip *chip, unsigned offset) { … } static int twl_direction_in(struct gpio_chip *chip, unsigned offset) { … } static int twl_get(struct gpio_chip *chip, unsigned offset) { … } static void twl_set(struct gpio_chip *chip, unsigned offset, int value) { … } static int twl_direction_out(struct gpio_chip *chip, unsigned offset, int value) { … } static int twl_get_direction(struct gpio_chip *chip, unsigned offset) { … } static int twl_to_irq(struct gpio_chip *chip, unsigned offset) { … } static const struct gpio_chip template_chip = …; /*----------------------------------------------------------------------*/ static int gpio_twl4030_pulls(u32 ups, u32 downs) { … } static int gpio_twl4030_debounce(u32 debounce, u8 mmc_cd) { … } static struct twl4030_gpio_platform_data *of_gpio_twl4030(struct device *dev) { … } /* Called from the registered devm action */ static void gpio_twl4030_power_off_action(void *data) { … } static int gpio_twl4030_probe(struct platform_device *pdev) { … } static const struct of_device_id twl_gpio_match[] = …; MODULE_DEVICE_TABLE(of, twl_gpio_match); /* Note: this hardware lives inside an I2C-based multi-function device. */ MODULE_ALIAS(…) …; static struct platform_driver gpio_twl4030_driver = …; static int __init gpio_twl4030_init(void) { … } subsys_initcall(gpio_twl4030_init); static void __exit gpio_twl4030_exit(void) { … } module_exit(gpio_twl4030_exit); MODULE_AUTHOR(…) …; MODULE_DESCRIPTION(…) …; MODULE_LICENSE(…) …;
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