// SPDX-License-Identifier: GPL-2.0-only /* * PCA953x 4/8/16/24/40 bit I/O ports * * Copyright (C) 2005 Ben Gardner <[email protected]> * Copyright (C) 2007 Marvell International Ltd. * * Derived from drivers/i2c/chips/pca9539.c */ #include <linux/atomic.h> #include <linux/bitmap.h> #include <linux/cleanup.h> #include <linux/device.h> #include <linux/errno.h> #include <linux/i2c.h> #include <linux/init.h> #include <linux/interrupt.h> #include <linux/irq.h> #include <linux/mod_devicetable.h> #include <linux/module.h> #include <linux/mutex.h> #include <linux/pm.h> #include <linux/regmap.h> #include <linux/regulator/consumer.h> #include <linux/seq_file.h> #include <linux/slab.h> #include <linux/gpio/consumer.h> #include <linux/gpio/driver.h> #include <linux/pinctrl/pinconf-generic.h> #include <linux/platform_data/pca953x.h> #define PCA953X_INPUT … #define PCA953X_OUTPUT … #define PCA953X_INVERT … #define PCA953X_DIRECTION … #define REG_ADDR_MASK … #define REG_ADDR_EXT … #define REG_ADDR_AI … #define PCA957X_IN … #define PCA957X_INVRT … #define PCA957X_BKEN … #define PCA957X_PUPD … #define PCA957X_CFG … #define PCA957X_OUT … #define PCA957X_MSK … #define PCA957X_INTS … #define PCAL953X_OUT_STRENGTH … #define PCAL953X_IN_LATCH … #define PCAL953X_PULL_EN … #define PCAL953X_PULL_SEL … #define PCAL953X_INT_MASK … #define PCAL953X_INT_STAT … #define PCAL953X_OUT_CONF … #define PCAL6524_INT_EDGE … #define PCAL6524_INT_CLR … #define PCAL6524_IN_STATUS … #define PCAL6524_OUT_INDCONF … #define PCAL6524_DEBOUNCE … #define PCA_GPIO_MASK … #define PCAL_GPIO_MASK … #define PCAL_PINCTRL_MASK … #define PCA_INT … #define PCA_PCAL … #define PCA_LATCH_INT … #define PCA953X_TYPE … #define PCA957X_TYPE … #define PCAL653X_TYPE … #define PCA_TYPE_MASK … #define PCA_CHIP_TYPE(x) … static const struct i2c_device_id pca953x_id[] = …; MODULE_DEVICE_TABLE(i2c, pca953x_id); #ifdef CONFIG_GPIO_PCA953X_IRQ #include <linux/acpi.h> #include <linux/dmi.h> static const struct acpi_gpio_params pca953x_irq_gpios = …; static const struct acpi_gpio_mapping pca953x_acpi_irq_gpios[] = …; static int pca953x_acpi_get_irq(struct device *dev) { … } static const struct dmi_system_id pca953x_dmi_acpi_irq_info[] = …; #endif static const struct acpi_device_id pca953x_acpi_ids[] = …; MODULE_DEVICE_TABLE(acpi, pca953x_acpi_ids); #define MAX_BANK … #define BANK_SZ … #define MAX_LINE … #define NBANK(chip) … struct pca953x_reg_config { … }; static const struct pca953x_reg_config pca953x_regs = …; static const struct pca953x_reg_config pca957x_regs = …; struct pca953x_chip { … }; static int pca953x_bank_shift(struct pca953x_chip *chip) { … } #define PCA953x_BANK_INPUT … #define PCA953x_BANK_OUTPUT … #define PCA953x_BANK_POLARITY … #define PCA953x_BANK_CONFIG … #define PCA957x_BANK_INPUT … #define PCA957x_BANK_POLARITY … #define PCA957x_BANK_BUSHOLD … #define PCA957x_BANK_CONFIG … #define PCA957x_BANK_OUTPUT … #define PCAL9xxx_BANK_IN_LATCH … #define PCAL9xxx_BANK_PULL_EN … #define PCAL9xxx_BANK_PULL_SEL … #define PCAL9xxx_BANK_IRQ_MASK … #define PCAL9xxx_BANK_IRQ_STAT … /* * We care about the following registers: * - Standard set, below 0x40, each port can be replicated up to 8 times * - PCA953x standard * Input port 0x00 + 0 * bank_size R * Output port 0x00 + 1 * bank_size RW * Polarity Inversion port 0x00 + 2 * bank_size RW * Configuration port 0x00 + 3 * bank_size RW * - PCA957x with mixed up registers * Input port 0x00 + 0 * bank_size R * Polarity Inversion port 0x00 + 1 * bank_size RW * Bus hold port 0x00 + 2 * bank_size RW * Configuration port 0x00 + 4 * bank_size RW * Output port 0x00 + 5 * bank_size RW * * - Extended set, above 0x40, often chip specific. * - PCAL6524/PCAL9555A with custom PCAL IRQ handling: * Input latch register 0x40 + 2 * bank_size RW * Pull-up/pull-down enable reg 0x40 + 3 * bank_size RW * Pull-up/pull-down select reg 0x40 + 4 * bank_size RW * Interrupt mask register 0x40 + 5 * bank_size RW * Interrupt status register 0x40 + 6 * bank_size R * * - Registers with bit 0x80 set, the AI bit * The bit is cleared and the registers fall into one of the * categories above. */ static bool pca953x_check_register(struct pca953x_chip *chip, unsigned int reg, u32 checkbank) { … } /* * Unfortunately, whilst the PCAL6534 chip (and compatibles) broadly follow the * same register layout as the PCAL6524, the spacing of the registers has been * fundamentally altered by compacting them and thus does not obey the same * rules, including being able to use bit shifting to determine bank. These * chips hence need special handling here. */ static bool pcal6534_check_register(struct pca953x_chip *chip, unsigned int reg, u32 checkbank) { … } static bool pca953x_readable_register(struct device *dev, unsigned int reg) { … } static bool pca953x_writeable_register(struct device *dev, unsigned int reg) { … } static bool pca953x_volatile_register(struct device *dev, unsigned int reg) { … } static const struct regmap_config pca953x_i2c_regmap = …; static const struct regmap_config pca953x_ai_i2c_regmap = …; static u8 pca953x_recalc_addr(struct pca953x_chip *chip, int reg, int off) { … } /* * The PCAL6534 and compatible chips have altered bank alignment that doesn't * fit within the bit shifting scheme used for other devices. */ static u8 pcal6534_recalc_addr(struct pca953x_chip *chip, int reg, int off) { … } static int pca953x_write_regs(struct pca953x_chip *chip, int reg, unsigned long *val) { … } static int pca953x_read_regs(struct pca953x_chip *chip, int reg, unsigned long *val) { … } static int pca953x_gpio_direction_input(struct gpio_chip *gc, unsigned off) { … } static int pca953x_gpio_direction_output(struct gpio_chip *gc, unsigned off, int val) { … } static int pca953x_gpio_get_value(struct gpio_chip *gc, unsigned off) { … } static void pca953x_gpio_set_value(struct gpio_chip *gc, unsigned off, int val) { … } static int pca953x_gpio_get_direction(struct gpio_chip *gc, unsigned off) { … } static int pca953x_gpio_get_multiple(struct gpio_chip *gc, unsigned long *mask, unsigned long *bits) { … } static void pca953x_gpio_set_multiple(struct gpio_chip *gc, unsigned long *mask, unsigned long *bits) { … } static int pca953x_gpio_set_pull_up_down(struct pca953x_chip *chip, unsigned int offset, unsigned long config) { … } static int pca953x_gpio_set_config(struct gpio_chip *gc, unsigned int offset, unsigned long config) { … } static void pca953x_setup_gpio(struct pca953x_chip *chip, int gpios) { … } #ifdef CONFIG_GPIO_PCA953X_IRQ static void pca953x_irq_mask(struct irq_data *d) { … } static void pca953x_irq_unmask(struct irq_data *d) { … } static int pca953x_irq_set_wake(struct irq_data *d, unsigned int on) { … } static void pca953x_irq_bus_lock(struct irq_data *d) { … } static void pca953x_irq_bus_sync_unlock(struct irq_data *d) { … } static int pca953x_irq_set_type(struct irq_data *d, unsigned int type) { … } static void pca953x_irq_shutdown(struct irq_data *d) { … } static void pca953x_irq_print_chip(struct irq_data *data, struct seq_file *p) { … } static const struct irq_chip pca953x_irq_chip = …; static bool pca953x_irq_pending(struct pca953x_chip *chip, unsigned long *pending) { … } static irqreturn_t pca953x_irq_handler(int irq, void *devid) { … } static int pca953x_irq_setup(struct pca953x_chip *chip, int irq_base) { … } #else /* CONFIG_GPIO_PCA953X_IRQ */ static int pca953x_irq_setup(struct pca953x_chip *chip, int irq_base) { struct i2c_client *client = chip->client; struct device *dev = &client->dev; if (client->irq && irq_base != -1 && (chip->driver_data & PCA_INT)) dev_warn(dev, "interrupt support not compiled in\n"); return 0; } #endif static int device_pca95xx_init(struct pca953x_chip *chip) { … } static int device_pca957x_init(struct pca953x_chip *chip) { … } static void pca953x_disable_regulator(void *reg) { … } static int pca953x_get_and_enable_regulator(struct pca953x_chip *chip) { … } static int pca953x_probe(struct i2c_client *client) { … } static int pca953x_regcache_sync(struct pca953x_chip *chip) { … } static int pca953x_restore_context(struct pca953x_chip *chip) { … } static void pca953x_save_context(struct pca953x_chip *chip) { … } static int pca953x_suspend(struct device *dev) { … } static int pca953x_resume(struct device *dev) { … } static DEFINE_SIMPLE_DEV_PM_OPS(pca953x_pm_ops, pca953x_suspend, pca953x_resume); /* convenience to stop overlong match-table lines */ #define OF_653X(__nrgpio, __int) … #define OF_953X(__nrgpio, __int) … #define OF_957X(__nrgpio, __int) … static const struct of_device_id pca953x_dt_ids[] = …; MODULE_DEVICE_TABLE(of, pca953x_dt_ids); static struct i2c_driver pca953x_driver = …; static int __init pca953x_init(void) { … } /* register after i2c postcore initcall and before * subsys initcalls that may rely on these GPIOs */ subsys_initcall(pca953x_init); static void __exit pca953x_exit(void) { … } module_exit(pca953x_exit); MODULE_AUTHOR(…) …; MODULE_DESCRIPTION(…) …; MODULE_LICENSE(…) …;
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