// SPDX-License-Identifier: GPL-2.0-only /* * Awinic AW9523B i2c pin controller driver * Copyright (c) 2020, AngeloGioacchino Del Regno <[email protected]> */ #include <linux/bitfield.h> #include <linux/errno.h> #include <linux/gpio/consumer.h> #include <linux/gpio/driver.h> #include <linux/i2c.h> #include <linux/init.h> #include <linux/interrupt.h> #include <linux/irq.h> #include <linux/module.h> #include <linux/mutex.h> #include <linux/property.h> #include <linux/regmap.h> #include <linux/regulator/consumer.h> #include <linux/slab.h> #include <linux/pinctrl/pinconf-generic.h> #include <linux/pinctrl/pinconf.h> #include <linux/pinctrl/pinctrl.h> #include <linux/pinctrl/pinmux.h> #define AW9523_MAX_FUNCS … #define AW9523_NUM_PORTS … #define AW9523_PINS_PER_PORT … /* * HW needs at least 20uS for reset and at least 1-2uS to recover from * reset, but we have to account for eventual board quirks, if any: * for this reason, keep reset asserted for 50uS and wait for 20uS * to recover from the reset. */ #define AW9523_HW_RESET_US … #define AW9523_HW_RESET_RECOVERY_US … /* Port 0: P0_0...P0_7 - Port 1: P1_0...P1_7 */ #define AW9523_PIN_TO_PORT(pin) … #define AW9523_REG_IN_STATE(pin) … #define AW9523_REG_OUT_STATE(pin) … #define AW9523_REG_CONF_STATE(pin) … #define AW9523_REG_INTR_DIS(pin) … #define AW9523_REG_CHIPID … #define AW9523_VAL_EXPECTED_CHIPID … #define AW9523_REG_GCR … #define AW9523_GCR_ISEL_MASK … #define AW9523_GCR_GPOMD_MASK … #define AW9523_REG_PORT_MODE(pin) … #define AW9523_REG_SOFT_RESET … #define AW9523_VAL_RESET … /* * struct aw9523_irq - Interrupt controller structure * @lock: mutex locking for the irq bus * @cached_gpio: stores the previous gpio status for bit comparison */ struct aw9523_irq { … }; /* * struct aw9523 - Main driver structure * @dev: device handle * @regmap: regmap handle for current device * @i2c_lock: Mutex lock for i2c operations * @reset_gpio: Hardware reset (RSTN) signal GPIO * @vio_vreg: VCC regulator (Optional) * @pctl: pinctrl handle for current device * @gpio: structure holding gpiochip params * @irq: Interrupt controller structure */ struct aw9523 { … }; static const struct pinctrl_pin_desc aw9523_pins[] = …; static int aw9523_pinctrl_get_groups_count(struct pinctrl_dev *pctldev) { … } static const char *aw9523_pinctrl_get_group_name(struct pinctrl_dev *pctldev, unsigned int selector) { … } static int aw9523_pinctrl_get_group_pins(struct pinctrl_dev *pctldev, unsigned int selector, const unsigned int **pins, unsigned int *num_pins) { … } static const struct pinctrl_ops aw9523_pinctrl_ops = …; static const char * const gpio_pwm_groups[] = …; /* Warning: Do NOT reorder this array */ static const struct pinfunction aw9523_pmx[] = …; static int aw9523_pmx_get_funcs_count(struct pinctrl_dev *pctl) { … } static const char *aw9523_pmx_get_fname(struct pinctrl_dev *pctl, unsigned int sel) { … } static int aw9523_pmx_get_groups(struct pinctrl_dev *pctl, unsigned int sel, const char * const **groups, unsigned int * const ngroups) { … } static int aw9523_pmx_set_mux(struct pinctrl_dev *pctl, unsigned int fsel, unsigned int grp) { … } static const struct pinmux_ops aw9523_pinmux_ops = …; static int aw9523_pcfg_param_to_reg(enum pin_config_param pcp, int pin, u8 *r) { … } static int aw9523_pconf_get(struct pinctrl_dev *pctldev, unsigned int pin, unsigned long *config) { … } static int aw9523_pconf_set(struct pinctrl_dev *pctldev, unsigned int pin, unsigned long *configs, unsigned int num_configs) { … } static const struct pinconf_ops aw9523_pinconf_ops = …; /* * aw9523_get_pin_direction - Get pin direction * @regmap: Regmap structure * @pin: gpiolib pin number * @n: pin index in port register * * Return: Pin direction for success or negative number for error */ static int aw9523_get_pin_direction(struct regmap *regmap, u8 pin, u8 n) { … } /* * aw9523_get_port_state - Get input or output state for entire port * @regmap: Regmap structure * @pin: gpiolib pin number * @regbit: hw pin index, used to retrieve port number * @state: returned port state * * Return: Zero for success or negative number for error */ static int aw9523_get_port_state(struct regmap *regmap, u8 pin, u8 regbit, unsigned int *state) { … } static int aw9523_gpio_irq_type(struct irq_data *d, unsigned int type) { … } /* * aw9523_irq_mask - Mask interrupt * @d: irq data * * Sets which interrupt to mask in the bitmap; * The interrupt will be masked when unlocking the irq bus. */ static void aw9523_irq_mask(struct irq_data *d) { … } /* * aw9523_irq_unmask - Unmask interrupt * @d: irq data * * Sets which interrupt to unmask in the bitmap; * The interrupt will be masked when unlocking the irq bus. */ static void aw9523_irq_unmask(struct irq_data *d) { … } static irqreturn_t aw9523_irq_thread_func(int irq, void *dev_id) { … } /* * aw9523_irq_bus_lock - Grab lock for interrupt operation * @d: irq data */ static void aw9523_irq_bus_lock(struct irq_data *d) { … } /* * aw9523_irq_bus_sync_unlock - Synchronize state and unlock * @d: irq data * * Writes the interrupt mask bits (found in the bit map) to the * hardware, then unlocks the bus. */ static void aw9523_irq_bus_sync_unlock(struct irq_data *d) { … } static int aw9523_gpio_get_direction(struct gpio_chip *chip, unsigned int offset) { … } static int aw9523_gpio_get(struct gpio_chip *chip, unsigned int offset) { … } /** * _aw9523_gpio_get_multiple - Get I/O state for an entire port * @regmap: Regmap structure * @pin: gpiolib pin number * @regbit: hw pin index, used to retrieve port number * @state: returned port I/O state * * Return: Zero for success or negative number for error */ static int _aw9523_gpio_get_multiple(struct aw9523 *awi, u8 regbit, u8 *state, u8 mask) { … } static int aw9523_gpio_get_multiple(struct gpio_chip *chip, unsigned long *mask, unsigned long *bits) { … } static void aw9523_gpio_set_multiple(struct gpio_chip *chip, unsigned long *mask, unsigned long *bits) { … } static void aw9523_gpio_set(struct gpio_chip *chip, unsigned int offset, int value) { … } static int aw9523_direction_input(struct gpio_chip *chip, unsigned int offset) { … } static int aw9523_direction_output(struct gpio_chip *chip, unsigned int offset, int value) { … } static int aw9523_drive_reset_gpio(struct aw9523 *awi) { … } static int aw9523_hw_reset(struct aw9523 *awi) { … } static int aw9523_init_gpiochip(struct aw9523 *awi, unsigned int npins) { … } static const struct irq_chip aw9523_irq_chip = …; static int aw9523_init_irq(struct aw9523 *awi, int irq) { … } static bool aw9523_is_reg_hole(unsigned int reg) { … } static bool aw9523_readable_reg(struct device *dev, unsigned int reg) { … } static bool aw9523_volatile_reg(struct device *dev, unsigned int reg) { … } static bool aw9523_writeable_reg(struct device *dev, unsigned int reg) { … } static bool aw9523_precious_reg(struct device *dev, unsigned int reg) { … } static const struct regmap_config aw9523_regmap = …; static int aw9523_hw_init(struct aw9523 *awi) { … } static int aw9523_probe(struct i2c_client *client) { … } static void aw9523_remove(struct i2c_client *client) { … } static const struct i2c_device_id aw9523_i2c_id_table[] = …; MODULE_DEVICE_TABLE(i2c, aw9523_i2c_id_table); static const struct of_device_id of_aw9523_i2c_match[] = …; MODULE_DEVICE_TABLE(of, of_aw9523_i2c_match); static struct i2c_driver aw9523_driver = …; module_i2c_driver(…) …; MODULE_DESCRIPTION(…) …; MODULE_AUTHOR(…) …; MODULE_LICENSE(…) …;
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