// SPDX-License-Identifier: GPL-2.0 /* * CZ.NIC's Turris Omnia MCU GPIO and IRQ driver * * 2024 by Marek Behún <[email protected]> */ #include <linux/array_size.h> #include <linux/bitfield.h> #include <linux/bitops.h> #include <linux/bug.h> #include <linux/cleanup.h> #include <linux/device.h> #include <linux/devm-helpers.h> #include <linux/errno.h> #include <linux/gpio/driver.h> #include <linux/i2c.h> #include <linux/interrupt.h> #include <linux/mutex.h> #include <linux/sysfs.h> #include <linux/types.h> #include <linux/workqueue.h> #include <asm/unaligned.h> #include <linux/turris-omnia-mcu-interface.h> #include "turris-omnia-mcu.h" #define OMNIA_CMD_INT_ARG_LEN … #define FRONT_BUTTON_RELEASE_DELAY_MS … static const char * const omnia_mcu_gpio_templates[64] = …; struct omnia_gpio { … }; #define OMNIA_GPIO_INVALID_INT_BIT … #define _DEF_GPIO(_cmd, _ctl_cmd, _bit, _ctl_bit, _int_bit, _feat, _feat_mask) … #define _DEF_GPIO_STS(_name) … #define _DEF_GPIO_CTL(_name) … #define _DEF_GPIO_EXT_STS(_name, _feat) … #define _DEF_GPIO_EXT_STS_LED(_name, _ledext) … #define _DEF_GPIO_EXT_STS_LEDALL(_name) … #define _DEF_GPIO_EXT_CTL(_name, _feat) … #define _DEF_INT(_name) … static inline bool is_int_bit_valid(const struct omnia_gpio *gpio) { … } static const struct omnia_gpio omnia_gpios[64] = …; /* mapping from interrupts to indexes of GPIOs in the omnia_gpios array */ const u8 omnia_int_to_gpio_idx[32] = …; /* index of PHY_SFP GPIO in the omnia_gpios array */ #define OMNIA_GPIO_PHY_SFP_OFFSET … static int omnia_ctl_cmd_locked(struct omnia_mcu *mcu, u8 cmd, u16 val, u16 mask) { … } static int omnia_ctl_cmd(struct omnia_mcu *mcu, u8 cmd, u16 val, u16 mask) { … } static int omnia_gpio_request(struct gpio_chip *gc, unsigned int offset) { … } static int omnia_gpio_get_direction(struct gpio_chip *gc, unsigned int offset) { … } static int omnia_gpio_direction_input(struct gpio_chip *gc, unsigned int offset) { … } static int omnia_gpio_direction_output(struct gpio_chip *gc, unsigned int offset, int value) { … } static int omnia_gpio_get(struct gpio_chip *gc, unsigned int offset) { … } static unsigned long * _relevant_field_for_sts_cmd(u8 cmd, unsigned long *sts, unsigned long *ext_sts, unsigned long *ext_ctl) { … } static int omnia_gpio_get_multiple(struct gpio_chip *gc, unsigned long *mask, unsigned long *bits) { … } static void omnia_gpio_set(struct gpio_chip *gc, unsigned int offset, int value) { … } static void omnia_gpio_set_multiple(struct gpio_chip *gc, unsigned long *mask, unsigned long *bits) { … } static bool omnia_gpio_available(struct omnia_mcu *mcu, const struct omnia_gpio *gpio) { … } static int omnia_gpio_init_valid_mask(struct gpio_chip *gc, unsigned long *valid_mask, unsigned int ngpios) { … } static int omnia_gpio_of_xlate(struct gpio_chip *gc, const struct of_phandle_args *gpiospec, u32 *flags) { … } static void omnia_irq_shutdown(struct irq_data *d) { … } static void omnia_irq_mask(struct irq_data *d) { … } static void omnia_irq_unmask(struct irq_data *d) { … } static int omnia_irq_set_type(struct irq_data *d, unsigned int type) { … } static void omnia_irq_bus_lock(struct irq_data *d) { … } /** * omnia_mask_interleave - Interleaves the bytes from @rising and @falling * @dst: the destination u8 array of interleaved bytes * @rising: rising mask * @falling: falling mask * * Interleaves the little-endian bytes from @rising and @falling words. * * If @rising = (r0, r1, r2, r3) and @falling = (f0, f1, f2, f3), the result is * @dst = (r0, f0, r1, f1, r2, f2, r3, f3). * * The MCU receives an interrupt mask and reports a pending interrupt bitmap in * this interleaved format. The rationale behind this is that the low-indexed * bits are more important - in many cases, the user will be interested only in * interrupts with indexes 0 to 7, and so the system can stop reading after * first 2 bytes (r0, f0), to save time on the slow I2C bus. * * Feel free to remove this function and its inverse, omnia_mask_deinterleave, * and use an appropriate bitmap_*() function once such a function exists. */ static void omnia_mask_interleave(u8 *dst, unsigned long rising, unsigned long falling) { … } /** * omnia_mask_deinterleave - Deinterleaves the bytes into @rising and @falling * @src: the source u8 array containing the interleaved bytes * @rising: pointer where to store the rising mask gathered from @src * @falling: pointer where to store the falling mask gathered from @src * * This is the inverse function to omnia_mask_interleave. */ static void omnia_mask_deinterleave(const u8 *src, unsigned long *rising, unsigned long *falling) { … } static void omnia_irq_bus_sync_unlock(struct irq_data *d) { … } static const struct irq_chip omnia_mcu_irq_chip = …; static void omnia_irq_init_valid_mask(struct gpio_chip *gc, unsigned long *valid_mask, unsigned int ngpios) { … } static int omnia_irq_init_hw(struct gpio_chip *gc) { … } /* * Determine how many bytes we need to read from the reply to the * OMNIA_CMD_GET_INT_AND_CLEAR command in order to retrieve all unmasked * interrupts. */ static unsigned int omnia_irq_compute_pending_length(unsigned long rising, unsigned long falling) { … } static bool omnia_irq_read_pending_new(struct omnia_mcu *mcu, unsigned long *pending) { … } static int omnia_read_status_word_old_fw(struct omnia_mcu *mcu, unsigned long *status) { … } static void button_release_emul_fn(struct work_struct *work) { … } static void fill_int_from_sts(unsigned long *rising, unsigned long *falling, unsigned long rising_sts, unsigned long falling_sts, unsigned long sts_bit, unsigned long int_bit) { … } static bool omnia_irq_read_pending_old(struct omnia_mcu *mcu, unsigned long *pending) { … } static bool omnia_irq_read_pending(struct omnia_mcu *mcu, unsigned long *pending) { … } static irqreturn_t omnia_irq_thread_handler(int irq, void *dev_id) { … } static const char * const front_button_modes[] = …; static ssize_t front_button_mode_show(struct device *dev, struct device_attribute *a, char *buf) { … } static ssize_t front_button_mode_store(struct device *dev, struct device_attribute *a, const char *buf, size_t count) { … } static DEVICE_ATTR_RW(front_button_mode); static struct attribute *omnia_mcu_gpio_attrs[] = …; const struct attribute_group omnia_mcu_gpio_group = …; int omnia_mcu_register_gpiochip(struct omnia_mcu *mcu) { … }
Codebase Browser
linux