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- // SPDX-License-Identifier: GPL-2.0-only
- /*
- * PCA953x 4/8/16/24/40 bit I/O ports
- *
- * Copyright (C) 2005 Ben Gardner <bgardner@wabtec.com>
- * Copyright (C) 2007 Marvell International Ltd.
- *
- * Derived from drivers/i2c/chips/pca9539.c
- */
- #include <linux/acpi.h>
- #include <linux/bitmap.h>
- #include <linux/gpio/driver.h>
- #include <linux/gpio/consumer.h>
- #include <linux/i2c.h>
- #include <linux/init.h>
- #include <linux/interrupt.h>
- #include <linux/module.h>
- #include <linux/of_platform.h>
- #include <linux/platform_data/pca953x.h>
- #include <linux/regmap.h>
- #include <linux/regulator/consumer.h>
- #include <linux/slab.h>
- #include <asm/unaligned.h>
- #define PCA953X_INPUT 0x00
- #define PCA953X_OUTPUT 0x01
- #define PCA953X_INVERT 0x02
- #define PCA953X_DIRECTION 0x03
- #define REG_ADDR_MASK GENMASK(5, 0)
- #define REG_ADDR_EXT BIT(6)
- #define REG_ADDR_AI BIT(7)
- #define PCA957X_IN 0x00
- #define PCA957X_INVRT 0x01
- #define PCA957X_BKEN 0x02
- #define PCA957X_PUPD 0x03
- #define PCA957X_CFG 0x04
- #define PCA957X_OUT 0x05
- #define PCA957X_MSK 0x06
- #define PCA957X_INTS 0x07
- #define PCAL953X_OUT_STRENGTH 0x20
- #define PCAL953X_IN_LATCH 0x22
- #define PCAL953X_PULL_EN 0x23
- #define PCAL953X_PULL_SEL 0x24
- #define PCAL953X_INT_MASK 0x25
- #define PCAL953X_INT_STAT 0x26
- #define PCAL953X_OUT_CONF 0x27
- #define PCAL6524_INT_EDGE 0x28
- #define PCAL6524_INT_CLR 0x2a
- #define PCAL6524_IN_STATUS 0x2b
- #define PCAL6524_OUT_INDCONF 0x2c
- #define PCAL6524_DEBOUNCE 0x2d
- #define PCA_GPIO_MASK GENMASK(7, 0)
- #define PCAL_GPIO_MASK GENMASK(4, 0)
- #define PCAL_PINCTRL_MASK GENMASK(6, 5)
- #define PCA_INT BIT(8)
- #define PCA_PCAL BIT(9)
- #define PCA_LATCH_INT (PCA_PCAL | PCA_INT)
- #define PCA953X_TYPE BIT(12)
- #define PCA957X_TYPE BIT(13)
- #define PCA_TYPE_MASK GENMASK(15, 12)
- #define PCA_CHIP_TYPE(x) ((x) & PCA_TYPE_MASK)
- static const struct i2c_device_id pca953x_id[] = {
- { "pca6416", 16 | PCA953X_TYPE | PCA_INT, },
- { "pca9505", 40 | PCA953X_TYPE | PCA_INT, },
- { "pca9534", 8 | PCA953X_TYPE | PCA_INT, },
- { "pca9535", 16 | PCA953X_TYPE | PCA_INT, },
- { "pca9536", 4 | PCA953X_TYPE, },
- { "pca9537", 4 | PCA953X_TYPE | PCA_INT, },
- { "pca9538", 8 | PCA953X_TYPE | PCA_INT, },
- { "pca9539", 16 | PCA953X_TYPE | PCA_INT, },
- { "pca9554", 8 | PCA953X_TYPE | PCA_INT, },
- { "pca9555", 16 | PCA953X_TYPE | PCA_INT, },
- { "pca9556", 8 | PCA953X_TYPE, },
- { "pca9557", 8 | PCA953X_TYPE, },
- { "pca9574", 8 | PCA957X_TYPE | PCA_INT, },
- { "pca9575", 16 | PCA957X_TYPE | PCA_INT, },
- { "pca9698", 40 | PCA953X_TYPE, },
- { "pcal6416", 16 | PCA953X_TYPE | PCA_LATCH_INT, },
- { "pcal6524", 24 | PCA953X_TYPE | PCA_LATCH_INT, },
- { "pcal9535", 16 | PCA953X_TYPE | PCA_LATCH_INT, },
- { "pcal9554b", 8 | PCA953X_TYPE | PCA_LATCH_INT, },
- { "pcal9555a", 16 | PCA953X_TYPE | PCA_LATCH_INT, },
- { "max7310", 8 | PCA953X_TYPE, },
- { "max7312", 16 | PCA953X_TYPE | PCA_INT, },
- { "max7313", 16 | PCA953X_TYPE | PCA_INT, },
- { "max7315", 8 | PCA953X_TYPE | PCA_INT, },
- { "max7318", 16 | PCA953X_TYPE | PCA_INT, },
- { "pca6107", 8 | PCA953X_TYPE | PCA_INT, },
- { "tca6408", 8 | PCA953X_TYPE | PCA_INT, },
- { "tca6416", 16 | PCA953X_TYPE | PCA_INT, },
- { "tca6424", 24 | PCA953X_TYPE | PCA_INT, },
- { "tca9539", 16 | PCA953X_TYPE | PCA_INT, },
- { "tca9554", 8 | PCA953X_TYPE | PCA_INT, },
- { "xra1202", 8 | PCA953X_TYPE },
- { }
- };
- MODULE_DEVICE_TABLE(i2c, pca953x_id);
- #ifdef CONFIG_GPIO_PCA953X_IRQ
- #include <linux/dmi.h>
- static const struct acpi_gpio_params pca953x_irq_gpios = { 0, 0, true };
- static const struct acpi_gpio_mapping pca953x_acpi_irq_gpios[] = {
- { "irq-gpios", &pca953x_irq_gpios, 1, ACPI_GPIO_QUIRK_ABSOLUTE_NUMBER },
- { }
- };
- static int pca953x_acpi_get_irq(struct device *dev)
- {
- int ret;
- ret = devm_acpi_dev_add_driver_gpios(dev, pca953x_acpi_irq_gpios);
- if (ret)
- dev_warn(dev, "can't add GPIO ACPI mapping\n");
- ret = acpi_dev_gpio_irq_get_by(ACPI_COMPANION(dev), "irq-gpios", 0);
- if (ret < 0)
- return ret;
- dev_info(dev, "ACPI interrupt quirk (IRQ %d)\n", ret);
- return ret;
- }
- static const struct dmi_system_id pca953x_dmi_acpi_irq_info[] = {
- {
- /*
- * On Intel Galileo Gen 2 board the IRQ pin of one of
- * the I²C GPIO expanders, which has GpioInt() resource,
- * is provided as an absolute number instead of being
- * relative. Since first controller (gpio-sch.c) and
- * second (gpio-dwapb.c) are at the fixed bases, we may
- * safely refer to the number in the global space to get
- * an IRQ out of it.
- */
- .matches = {
- DMI_EXACT_MATCH(DMI_BOARD_NAME, "GalileoGen2"),
- },
- },
- {}
- };
- #endif
- static const struct acpi_device_id pca953x_acpi_ids[] = {
- { "INT3491", 16 | PCA953X_TYPE | PCA_LATCH_INT, },
- { }
- };
- MODULE_DEVICE_TABLE(acpi, pca953x_acpi_ids);
- #define MAX_BANK 5
- #define BANK_SZ 8
- #define MAX_LINE (MAX_BANK * BANK_SZ)
- #define NBANK(chip) DIV_ROUND_UP(chip->gpio_chip.ngpio, BANK_SZ)
- struct pca953x_reg_config {
- int direction;
- int output;
- int input;
- int invert;
- };
- static const struct pca953x_reg_config pca953x_regs = {
- .direction = PCA953X_DIRECTION,
- .output = PCA953X_OUTPUT,
- .input = PCA953X_INPUT,
- .invert = PCA953X_INVERT,
- };
- static const struct pca953x_reg_config pca957x_regs = {
- .direction = PCA957X_CFG,
- .output = PCA957X_OUT,
- .input = PCA957X_IN,
- .invert = PCA957X_INVRT,
- };
- struct pca953x_chip {
- unsigned gpio_start;
- struct mutex i2c_lock;
- struct regmap *regmap;
- #ifdef CONFIG_GPIO_PCA953X_IRQ
- struct mutex irq_lock;
- DECLARE_BITMAP(irq_mask, MAX_LINE);
- DECLARE_BITMAP(irq_stat, MAX_LINE);
- DECLARE_BITMAP(irq_trig_raise, MAX_LINE);
- DECLARE_BITMAP(irq_trig_fall, MAX_LINE);
- struct irq_chip irq_chip;
- #endif
- atomic_t wakeup_path;
- struct i2c_client *client;
- struct gpio_chip gpio_chip;
- const char *const *names;
- unsigned long driver_data;
- struct regulator *regulator;
- const struct pca953x_reg_config *regs;
- };
- static int pca953x_bank_shift(struct pca953x_chip *chip)
- {
- return fls((chip->gpio_chip.ngpio - 1) / BANK_SZ);
- }
- #define PCA953x_BANK_INPUT BIT(0)
- #define PCA953x_BANK_OUTPUT BIT(1)
- #define PCA953x_BANK_POLARITY BIT(2)
- #define PCA953x_BANK_CONFIG BIT(3)
- #define PCA957x_BANK_INPUT BIT(0)
- #define PCA957x_BANK_POLARITY BIT(1)
- #define PCA957x_BANK_BUSHOLD BIT(2)
- #define PCA957x_BANK_CONFIG BIT(4)
- #define PCA957x_BANK_OUTPUT BIT(5)
- #define PCAL9xxx_BANK_IN_LATCH BIT(8 + 2)
- #define PCAL9xxx_BANK_PULL_EN BIT(8 + 3)
- #define PCAL9xxx_BANK_PULL_SEL BIT(8 + 4)
- #define PCAL9xxx_BANK_IRQ_MASK BIT(8 + 5)
- #define PCAL9xxx_BANK_IRQ_STAT BIT(8 + 6)
- /*
- * 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)
- {
- int bank_shift = pca953x_bank_shift(chip);
- int bank = (reg & REG_ADDR_MASK) >> bank_shift;
- int offset = reg & (BIT(bank_shift) - 1);
- /* Special PCAL extended register check. */
- if (reg & REG_ADDR_EXT) {
- if (!(chip->driver_data & PCA_PCAL))
- return false;
- bank += 8;
- }
- /* Register is not in the matching bank. */
- if (!(BIT(bank) & checkbank))
- return false;
- /* Register is not within allowed range of bank. */
- if (offset >= NBANK(chip))
- return false;
- return true;
- }
- static bool pca953x_readable_register(struct device *dev, unsigned int reg)
- {
- struct pca953x_chip *chip = dev_get_drvdata(dev);
- u32 bank;
- if (PCA_CHIP_TYPE(chip->driver_data) == PCA953X_TYPE) {
- bank = PCA953x_BANK_INPUT | PCA953x_BANK_OUTPUT |
- PCA953x_BANK_POLARITY | PCA953x_BANK_CONFIG;
- } else {
- bank = PCA957x_BANK_INPUT | PCA957x_BANK_OUTPUT |
- PCA957x_BANK_POLARITY | PCA957x_BANK_CONFIG |
- PCA957x_BANK_BUSHOLD;
- }
- if (chip->driver_data & PCA_PCAL) {
- bank |= PCAL9xxx_BANK_IN_LATCH | PCAL9xxx_BANK_PULL_EN |
- PCAL9xxx_BANK_PULL_SEL | PCAL9xxx_BANK_IRQ_MASK |
- PCAL9xxx_BANK_IRQ_STAT;
- }
- return pca953x_check_register(chip, reg, bank);
- }
- static bool pca953x_writeable_register(struct device *dev, unsigned int reg)
- {
- struct pca953x_chip *chip = dev_get_drvdata(dev);
- u32 bank;
- if (PCA_CHIP_TYPE(chip->driver_data) == PCA953X_TYPE) {
- bank = PCA953x_BANK_OUTPUT | PCA953x_BANK_POLARITY |
- PCA953x_BANK_CONFIG;
- } else {
- bank = PCA957x_BANK_OUTPUT | PCA957x_BANK_POLARITY |
- PCA957x_BANK_CONFIG | PCA957x_BANK_BUSHOLD;
- }
- if (chip->driver_data & PCA_PCAL)
- bank |= PCAL9xxx_BANK_IN_LATCH | PCAL9xxx_BANK_PULL_EN |
- PCAL9xxx_BANK_PULL_SEL | PCAL9xxx_BANK_IRQ_MASK;
- return pca953x_check_register(chip, reg, bank);
- }
- static bool pca953x_volatile_register(struct device *dev, unsigned int reg)
- {
- struct pca953x_chip *chip = dev_get_drvdata(dev);
- u32 bank;
- if (PCA_CHIP_TYPE(chip->driver_data) == PCA953X_TYPE)
- bank = PCA953x_BANK_INPUT;
- else
- bank = PCA957x_BANK_INPUT;
- if (chip->driver_data & PCA_PCAL)
- bank |= PCAL9xxx_BANK_IRQ_STAT;
- return pca953x_check_register(chip, reg, bank);
- }
- static const struct regmap_config pca953x_i2c_regmap = {
- .reg_bits = 8,
- .val_bits = 8,
- .readable_reg = pca953x_readable_register,
- .writeable_reg = pca953x_writeable_register,
- .volatile_reg = pca953x_volatile_register,
- .disable_locking = true,
- .cache_type = REGCACHE_RBTREE,
- .max_register = 0x7f,
- };
- static const struct regmap_config pca953x_ai_i2c_regmap = {
- .reg_bits = 8,
- .val_bits = 8,
- .read_flag_mask = REG_ADDR_AI,
- .write_flag_mask = REG_ADDR_AI,
- .readable_reg = pca953x_readable_register,
- .writeable_reg = pca953x_writeable_register,
- .volatile_reg = pca953x_volatile_register,
- .disable_locking = true,
- .cache_type = REGCACHE_RBTREE,
- .max_register = 0x7f,
- };
- static u8 pca953x_recalc_addr(struct pca953x_chip *chip, int reg, int off)
- {
- int bank_shift = pca953x_bank_shift(chip);
- int addr = (reg & PCAL_GPIO_MASK) << bank_shift;
- int pinctrl = (reg & PCAL_PINCTRL_MASK) << 1;
- u8 regaddr = pinctrl | addr | (off / BANK_SZ);
- return regaddr;
- }
- static int pca953x_write_regs(struct pca953x_chip *chip, int reg, unsigned long *val)
- {
- u8 regaddr = pca953x_recalc_addr(chip, reg, 0);
- u8 value[MAX_BANK];
- int i, ret;
- for (i = 0; i < NBANK(chip); i++)
- value[i] = bitmap_get_value8(val, i * BANK_SZ);
- ret = regmap_bulk_write(chip->regmap, regaddr, value, NBANK(chip));
- if (ret < 0) {
- dev_err(&chip->client->dev, "failed writing register\n");
- return ret;
- }
- return 0;
- }
- static int pca953x_read_regs(struct pca953x_chip *chip, int reg, unsigned long *val)
- {
- u8 regaddr = pca953x_recalc_addr(chip, reg, 0);
- u8 value[MAX_BANK];
- int i, ret;
- ret = regmap_bulk_read(chip->regmap, regaddr, value, NBANK(chip));
- if (ret < 0) {
- dev_err(&chip->client->dev, "failed reading register\n");
- return ret;
- }
- for (i = 0; i < NBANK(chip); i++)
- bitmap_set_value8(val, value[i], i * BANK_SZ);
- return 0;
- }
- static int pca953x_gpio_direction_input(struct gpio_chip *gc, unsigned off)
- {
- struct pca953x_chip *chip = gpiochip_get_data(gc);
- u8 dirreg = pca953x_recalc_addr(chip, chip->regs->direction, off);
- u8 bit = BIT(off % BANK_SZ);
- int ret;
- mutex_lock(&chip->i2c_lock);
- ret = regmap_write_bits(chip->regmap, dirreg, bit, bit);
- mutex_unlock(&chip->i2c_lock);
- return ret;
- }
- static int pca953x_gpio_direction_output(struct gpio_chip *gc,
- unsigned off, int val)
- {
- struct pca953x_chip *chip = gpiochip_get_data(gc);
- u8 dirreg = pca953x_recalc_addr(chip, chip->regs->direction, off);
- u8 outreg = pca953x_recalc_addr(chip, chip->regs->output, off);
- u8 bit = BIT(off % BANK_SZ);
- int ret;
- mutex_lock(&chip->i2c_lock);
- /* set output level */
- ret = regmap_write_bits(chip->regmap, outreg, bit, val ? bit : 0);
- if (ret)
- goto exit;
- /* then direction */
- ret = regmap_write_bits(chip->regmap, dirreg, bit, 0);
- exit:
- mutex_unlock(&chip->i2c_lock);
- return ret;
- }
- static int pca953x_gpio_get_value(struct gpio_chip *gc, unsigned off)
- {
- struct pca953x_chip *chip = gpiochip_get_data(gc);
- u8 inreg = pca953x_recalc_addr(chip, chip->regs->input, off);
- u8 bit = BIT(off % BANK_SZ);
- u32 reg_val;
- int ret;
- mutex_lock(&chip->i2c_lock);
- ret = regmap_read(chip->regmap, inreg, ®_val);
- mutex_unlock(&chip->i2c_lock);
- if (ret < 0)
- return ret;
- return !!(reg_val & bit);
- }
- static void pca953x_gpio_set_value(struct gpio_chip *gc, unsigned off, int val)
- {
- struct pca953x_chip *chip = gpiochip_get_data(gc);
- u8 outreg = pca953x_recalc_addr(chip, chip->regs->output, off);
- u8 bit = BIT(off % BANK_SZ);
- mutex_lock(&chip->i2c_lock);
- regmap_write_bits(chip->regmap, outreg, bit, val ? bit : 0);
- mutex_unlock(&chip->i2c_lock);
- }
- static int pca953x_gpio_get_direction(struct gpio_chip *gc, unsigned off)
- {
- struct pca953x_chip *chip = gpiochip_get_data(gc);
- u8 dirreg = pca953x_recalc_addr(chip, chip->regs->direction, off);
- u8 bit = BIT(off % BANK_SZ);
- u32 reg_val;
- int ret;
- mutex_lock(&chip->i2c_lock);
- ret = regmap_read(chip->regmap, dirreg, ®_val);
- mutex_unlock(&chip->i2c_lock);
- if (ret < 0)
- return ret;
- if (reg_val & bit)
- return GPIO_LINE_DIRECTION_IN;
- return GPIO_LINE_DIRECTION_OUT;
- }
- static int pca953x_gpio_get_multiple(struct gpio_chip *gc,
- unsigned long *mask, unsigned long *bits)
- {
- struct pca953x_chip *chip = gpiochip_get_data(gc);
- DECLARE_BITMAP(reg_val, MAX_LINE);
- int ret;
- mutex_lock(&chip->i2c_lock);
- ret = pca953x_read_regs(chip, chip->regs->input, reg_val);
- mutex_unlock(&chip->i2c_lock);
- if (ret)
- return ret;
- bitmap_replace(bits, bits, reg_val, mask, gc->ngpio);
- return 0;
- }
- static void pca953x_gpio_set_multiple(struct gpio_chip *gc,
- unsigned long *mask, unsigned long *bits)
- {
- struct pca953x_chip *chip = gpiochip_get_data(gc);
- DECLARE_BITMAP(reg_val, MAX_LINE);
- int ret;
- mutex_lock(&chip->i2c_lock);
- ret = pca953x_read_regs(chip, chip->regs->output, reg_val);
- if (ret)
- goto exit;
- bitmap_replace(reg_val, reg_val, bits, mask, gc->ngpio);
- pca953x_write_regs(chip, chip->regs->output, reg_val);
- exit:
- mutex_unlock(&chip->i2c_lock);
- }
- static int pca953x_gpio_set_pull_up_down(struct pca953x_chip *chip,
- unsigned int offset,
- unsigned long config)
- {
- u8 pull_en_reg = pca953x_recalc_addr(chip, PCAL953X_PULL_EN, offset);
- u8 pull_sel_reg = pca953x_recalc_addr(chip, PCAL953X_PULL_SEL, offset);
- u8 bit = BIT(offset % BANK_SZ);
- int ret;
- /*
- * pull-up/pull-down configuration requires PCAL extended
- * registers
- */
- if (!(chip->driver_data & PCA_PCAL))
- return -ENOTSUPP;
- mutex_lock(&chip->i2c_lock);
- /* Configure pull-up/pull-down */
- if (config == PIN_CONFIG_BIAS_PULL_UP)
- ret = regmap_write_bits(chip->regmap, pull_sel_reg, bit, bit);
- else if (config == PIN_CONFIG_BIAS_PULL_DOWN)
- ret = regmap_write_bits(chip->regmap, pull_sel_reg, bit, 0);
- else
- ret = 0;
- if (ret)
- goto exit;
- /* Disable/Enable pull-up/pull-down */
- if (config == PIN_CONFIG_BIAS_DISABLE)
- ret = regmap_write_bits(chip->regmap, pull_en_reg, bit, 0);
- else
- ret = regmap_write_bits(chip->regmap, pull_en_reg, bit, bit);
- exit:
- mutex_unlock(&chip->i2c_lock);
- return ret;
- }
- static int pca953x_gpio_set_config(struct gpio_chip *gc, unsigned int offset,
- unsigned long config)
- {
- struct pca953x_chip *chip = gpiochip_get_data(gc);
- switch (pinconf_to_config_param(config)) {
- case PIN_CONFIG_BIAS_PULL_UP:
- case PIN_CONFIG_BIAS_PULL_PIN_DEFAULT:
- case PIN_CONFIG_BIAS_PULL_DOWN:
- case PIN_CONFIG_BIAS_DISABLE:
- return pca953x_gpio_set_pull_up_down(chip, offset, config);
- default:
- return -ENOTSUPP;
- }
- }
- static void pca953x_setup_gpio(struct pca953x_chip *chip, int gpios)
- {
- struct gpio_chip *gc;
- gc = &chip->gpio_chip;
- gc->direction_input = pca953x_gpio_direction_input;
- gc->direction_output = pca953x_gpio_direction_output;
- gc->get = pca953x_gpio_get_value;
- gc->set = pca953x_gpio_set_value;
- gc->get_direction = pca953x_gpio_get_direction;
- gc->get_multiple = pca953x_gpio_get_multiple;
- gc->set_multiple = pca953x_gpio_set_multiple;
- gc->set_config = pca953x_gpio_set_config;
- gc->can_sleep = true;
- gc->base = chip->gpio_start;
- gc->ngpio = gpios;
- gc->label = dev_name(&chip->client->dev);
- gc->parent = &chip->client->dev;
- gc->owner = THIS_MODULE;
- gc->names = chip->names;
- }
- #ifdef CONFIG_GPIO_PCA953X_IRQ
- static void pca953x_irq_mask(struct irq_data *d)
- {
- struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
- struct pca953x_chip *chip = gpiochip_get_data(gc);
- irq_hw_number_t hwirq = irqd_to_hwirq(d);
- clear_bit(hwirq, chip->irq_mask);
- }
- static void pca953x_irq_unmask(struct irq_data *d)
- {
- struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
- struct pca953x_chip *chip = gpiochip_get_data(gc);
- irq_hw_number_t hwirq = irqd_to_hwirq(d);
- set_bit(hwirq, chip->irq_mask);
- }
- static int pca953x_irq_set_wake(struct irq_data *d, unsigned int on)
- {
- struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
- struct pca953x_chip *chip = gpiochip_get_data(gc);
- if (on)
- atomic_inc(&chip->wakeup_path);
- else
- atomic_dec(&chip->wakeup_path);
- return irq_set_irq_wake(chip->client->irq, on);
- }
- static void pca953x_irq_bus_lock(struct irq_data *d)
- {
- struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
- struct pca953x_chip *chip = gpiochip_get_data(gc);
- mutex_lock(&chip->irq_lock);
- }
- static void pca953x_irq_bus_sync_unlock(struct irq_data *d)
- {
- struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
- struct pca953x_chip *chip = gpiochip_get_data(gc);
- DECLARE_BITMAP(irq_mask, MAX_LINE);
- DECLARE_BITMAP(reg_direction, MAX_LINE);
- int level;
- if (chip->driver_data & PCA_PCAL) {
- /* Enable latch on interrupt-enabled inputs */
- pca953x_write_regs(chip, PCAL953X_IN_LATCH, chip->irq_mask);
- bitmap_complement(irq_mask, chip->irq_mask, gc->ngpio);
- /* Unmask enabled interrupts */
- pca953x_write_regs(chip, PCAL953X_INT_MASK, irq_mask);
- }
- /* Switch direction to input if needed */
- pca953x_read_regs(chip, chip->regs->direction, reg_direction);
- bitmap_or(irq_mask, chip->irq_trig_fall, chip->irq_trig_raise, gc->ngpio);
- bitmap_complement(reg_direction, reg_direction, gc->ngpio);
- bitmap_and(irq_mask, irq_mask, reg_direction, gc->ngpio);
- /* Look for any newly setup interrupt */
- for_each_set_bit(level, irq_mask, gc->ngpio)
- pca953x_gpio_direction_input(&chip->gpio_chip, level);
- mutex_unlock(&chip->irq_lock);
- }
- static int pca953x_irq_set_type(struct irq_data *d, unsigned int type)
- {
- struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
- struct pca953x_chip *chip = gpiochip_get_data(gc);
- irq_hw_number_t hwirq = irqd_to_hwirq(d);
- if (!(type & IRQ_TYPE_EDGE_BOTH)) {
- dev_err(&chip->client->dev, "irq %d: unsupported type %d\n",
- d->irq, type);
- return -EINVAL;
- }
- assign_bit(hwirq, chip->irq_trig_fall, type & IRQ_TYPE_EDGE_FALLING);
- assign_bit(hwirq, chip->irq_trig_raise, type & IRQ_TYPE_EDGE_RISING);
- return 0;
- }
- static void pca953x_irq_shutdown(struct irq_data *d)
- {
- struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
- struct pca953x_chip *chip = gpiochip_get_data(gc);
- irq_hw_number_t hwirq = irqd_to_hwirq(d);
- clear_bit(hwirq, chip->irq_trig_raise);
- clear_bit(hwirq, chip->irq_trig_fall);
- }
- static bool pca953x_irq_pending(struct pca953x_chip *chip, unsigned long *pending)
- {
- struct gpio_chip *gc = &chip->gpio_chip;
- DECLARE_BITMAP(reg_direction, MAX_LINE);
- DECLARE_BITMAP(old_stat, MAX_LINE);
- DECLARE_BITMAP(cur_stat, MAX_LINE);
- DECLARE_BITMAP(new_stat, MAX_LINE);
- DECLARE_BITMAP(trigger, MAX_LINE);
- int ret;
- if (chip->driver_data & PCA_PCAL) {
- /* Read the current interrupt status from the device */
- ret = pca953x_read_regs(chip, PCAL953X_INT_STAT, trigger);
- if (ret)
- return false;
- /* Check latched inputs and clear interrupt status */
- ret = pca953x_read_regs(chip, chip->regs->input, cur_stat);
- if (ret)
- return false;
- /* Apply filter for rising/falling edge selection */
- bitmap_replace(new_stat, chip->irq_trig_fall, chip->irq_trig_raise, cur_stat, gc->ngpio);
- bitmap_and(pending, new_stat, trigger, gc->ngpio);
- return !bitmap_empty(pending, gc->ngpio);
- }
- ret = pca953x_read_regs(chip, chip->regs->input, cur_stat);
- if (ret)
- return false;
- /* Remove output pins from the equation */
- pca953x_read_regs(chip, chip->regs->direction, reg_direction);
- bitmap_copy(old_stat, chip->irq_stat, gc->ngpio);
- bitmap_and(new_stat, cur_stat, reg_direction, gc->ngpio);
- bitmap_xor(cur_stat, new_stat, old_stat, gc->ngpio);
- bitmap_and(trigger, cur_stat, chip->irq_mask, gc->ngpio);
- if (bitmap_empty(trigger, gc->ngpio))
- return false;
- bitmap_copy(chip->irq_stat, new_stat, gc->ngpio);
- bitmap_and(cur_stat, chip->irq_trig_fall, old_stat, gc->ngpio);
- bitmap_and(old_stat, chip->irq_trig_raise, new_stat, gc->ngpio);
- bitmap_or(new_stat, old_stat, cur_stat, gc->ngpio);
- bitmap_and(pending, new_stat, trigger, gc->ngpio);
- return !bitmap_empty(pending, gc->ngpio);
- }
- static irqreturn_t pca953x_irq_handler(int irq, void *devid)
- {
- struct pca953x_chip *chip = devid;
- struct gpio_chip *gc = &chip->gpio_chip;
- DECLARE_BITMAP(pending, MAX_LINE);
- int level;
- bool ret;
- bitmap_zero(pending, MAX_LINE);
- mutex_lock(&chip->i2c_lock);
- ret = pca953x_irq_pending(chip, pending);
- mutex_unlock(&chip->i2c_lock);
- if (ret) {
- ret = 0;
- for_each_set_bit(level, pending, gc->ngpio) {
- int nested_irq = irq_find_mapping(gc->irq.domain, level);
- if (unlikely(nested_irq <= 0)) {
- dev_warn_ratelimited(gc->parent, "unmapped interrupt %d\n", level);
- continue;
- }
- handle_nested_irq(nested_irq);
- ret = 1;
- }
- }
- return IRQ_RETVAL(ret);
- }
- static int pca953x_irq_setup(struct pca953x_chip *chip, int irq_base)
- {
- struct i2c_client *client = chip->client;
- struct irq_chip *irq_chip = &chip->irq_chip;
- DECLARE_BITMAP(reg_direction, MAX_LINE);
- DECLARE_BITMAP(irq_stat, MAX_LINE);
- struct gpio_irq_chip *girq;
- int ret;
- if (dmi_first_match(pca953x_dmi_acpi_irq_info)) {
- ret = pca953x_acpi_get_irq(&client->dev);
- if (ret > 0)
- client->irq = ret;
- }
- if (!client->irq)
- return 0;
- if (irq_base == -1)
- return 0;
- if (!(chip->driver_data & PCA_INT))
- return 0;
- ret = pca953x_read_regs(chip, chip->regs->input, irq_stat);
- if (ret)
- return ret;
- /*
- * There is no way to know which GPIO line generated the
- * interrupt. We have to rely on the previous read for
- * this purpose.
- */
- pca953x_read_regs(chip, chip->regs->direction, reg_direction);
- bitmap_and(chip->irq_stat, irq_stat, reg_direction, chip->gpio_chip.ngpio);
- mutex_init(&chip->irq_lock);
- irq_chip->name = dev_name(&client->dev);
- irq_chip->irq_mask = pca953x_irq_mask;
- irq_chip->irq_unmask = pca953x_irq_unmask;
- irq_chip->irq_set_wake = pca953x_irq_set_wake;
- irq_chip->irq_bus_lock = pca953x_irq_bus_lock;
- irq_chip->irq_bus_sync_unlock = pca953x_irq_bus_sync_unlock;
- irq_chip->irq_set_type = pca953x_irq_set_type;
- irq_chip->irq_shutdown = pca953x_irq_shutdown;
- girq = &chip->gpio_chip.irq;
- girq->chip = irq_chip;
- /* This will let us handle the parent IRQ in the driver */
- girq->parent_handler = NULL;
- girq->num_parents = 0;
- girq->parents = NULL;
- girq->default_type = IRQ_TYPE_NONE;
- girq->handler = handle_simple_irq;
- girq->threaded = true;
- girq->first = irq_base; /* FIXME: get rid of this */
- ret = devm_request_threaded_irq(&client->dev, client->irq,
- NULL, pca953x_irq_handler,
- IRQF_ONESHOT | IRQF_SHARED,
- dev_name(&client->dev), chip);
- if (ret) {
- dev_err(&client->dev, "failed to request irq %d\n",
- client->irq);
- return ret;
- }
- return 0;
- }
- #else /* CONFIG_GPIO_PCA953X_IRQ */
- static int pca953x_irq_setup(struct pca953x_chip *chip,
- int irq_base)
- {
- struct i2c_client *client = chip->client;
- if (client->irq && irq_base != -1 && (chip->driver_data & PCA_INT))
- dev_warn(&client->dev, "interrupt support not compiled in\n");
- return 0;
- }
- #endif
- static int device_pca95xx_init(struct pca953x_chip *chip, u32 invert)
- {
- DECLARE_BITMAP(val, MAX_LINE);
- int ret;
- ret = regcache_sync_region(chip->regmap, chip->regs->output,
- chip->regs->output + NBANK(chip));
- if (ret)
- goto out;
- ret = regcache_sync_region(chip->regmap, chip->regs->direction,
- chip->regs->direction + NBANK(chip));
- if (ret)
- goto out;
- /* set platform specific polarity inversion */
- if (invert)
- bitmap_fill(val, MAX_LINE);
- else
- bitmap_zero(val, MAX_LINE);
- ret = pca953x_write_regs(chip, chip->regs->invert, val);
- out:
- return ret;
- }
- static int device_pca957x_init(struct pca953x_chip *chip, u32 invert)
- {
- DECLARE_BITMAP(val, MAX_LINE);
- unsigned int i;
- int ret;
- ret = device_pca95xx_init(chip, invert);
- if (ret)
- goto out;
- /* To enable register 6, 7 to control pull up and pull down */
- for (i = 0; i < NBANK(chip); i++)
- bitmap_set_value8(val, 0x02, i * BANK_SZ);
- ret = pca953x_write_regs(chip, PCA957X_BKEN, val);
- if (ret)
- goto out;
- return 0;
- out:
- return ret;
- }
- static int pca953x_probe(struct i2c_client *client,
- const struct i2c_device_id *i2c_id)
- {
- struct pca953x_platform_data *pdata;
- struct pca953x_chip *chip;
- int irq_base = 0;
- int ret;
- u32 invert = 0;
- struct regulator *reg;
- const struct regmap_config *regmap_config;
- chip = devm_kzalloc(&client->dev, sizeof(*chip), GFP_KERNEL);
- if (chip == NULL)
- return -ENOMEM;
- pdata = dev_get_platdata(&client->dev);
- if (pdata) {
- irq_base = pdata->irq_base;
- chip->gpio_start = pdata->gpio_base;
- invert = pdata->invert;
- chip->names = pdata->names;
- } else {
- struct gpio_desc *reset_gpio;
- chip->gpio_start = -1;
- irq_base = 0;
- /*
- * See if we need to de-assert a reset pin.
- *
- * There is no known ACPI-enabled platforms that are
- * using "reset" GPIO. Otherwise any of those platform
- * must use _DSD method with corresponding property.
- */
- reset_gpio = devm_gpiod_get_optional(&client->dev, "reset",
- GPIOD_OUT_LOW);
- if (IS_ERR(reset_gpio))
- return PTR_ERR(reset_gpio);
- }
- chip->client = client;
- reg = devm_regulator_get(&client->dev, "vcc");
- if (IS_ERR(reg))
- return dev_err_probe(&client->dev, PTR_ERR(reg), "reg get err\n");
- ret = regulator_enable(reg);
- if (ret) {
- dev_err(&client->dev, "reg en err: %d\n", ret);
- return ret;
- }
- chip->regulator = reg;
- if (i2c_id) {
- chip->driver_data = i2c_id->driver_data;
- } else {
- const void *match;
- match = device_get_match_data(&client->dev);
- if (!match) {
- ret = -ENODEV;
- goto err_exit;
- }
- chip->driver_data = (uintptr_t)match;
- }
- i2c_set_clientdata(client, chip);
- pca953x_setup_gpio(chip, chip->driver_data & PCA_GPIO_MASK);
- if (NBANK(chip) > 2 || PCA_CHIP_TYPE(chip->driver_data) == PCA957X_TYPE) {
- dev_info(&client->dev, "using AI\n");
- regmap_config = &pca953x_ai_i2c_regmap;
- } else {
- dev_info(&client->dev, "using no AI\n");
- regmap_config = &pca953x_i2c_regmap;
- }
- chip->regmap = devm_regmap_init_i2c(client, regmap_config);
- if (IS_ERR(chip->regmap)) {
- ret = PTR_ERR(chip->regmap);
- goto err_exit;
- }
- regcache_mark_dirty(chip->regmap);
- mutex_init(&chip->i2c_lock);
- /*
- * In case we have an i2c-mux controlled by a GPIO provided by an
- * expander using the same driver higher on the device tree, read the
- * i2c adapter nesting depth and use the retrieved value as lockdep
- * subclass for chip->i2c_lock.
- *
- * REVISIT: This solution is not complete. It protects us from lockdep
- * false positives when the expander controlling the i2c-mux is on
- * a different level on the device tree, but not when it's on the same
- * level on a different branch (in which case the subclass number
- * would be the same).
- *
- * TODO: Once a correct solution is developed, a similar fix should be
- * applied to all other i2c-controlled GPIO expanders (and potentially
- * regmap-i2c).
- */
- lockdep_set_subclass(&chip->i2c_lock,
- i2c_adapter_depth(client->adapter));
- /* initialize cached registers from their original values.
- * we can't share this chip with another i2c master.
- */
- if (PCA_CHIP_TYPE(chip->driver_data) == PCA953X_TYPE) {
- chip->regs = &pca953x_regs;
- ret = device_pca95xx_init(chip, invert);
- } else {
- chip->regs = &pca957x_regs;
- ret = device_pca957x_init(chip, invert);
- }
- if (ret)
- goto err_exit;
- ret = pca953x_irq_setup(chip, irq_base);
- if (ret)
- goto err_exit;
- ret = devm_gpiochip_add_data(&client->dev, &chip->gpio_chip, chip);
- if (ret)
- goto err_exit;
- if (pdata && pdata->setup) {
- ret = pdata->setup(client, chip->gpio_chip.base,
- chip->gpio_chip.ngpio, pdata->context);
- if (ret < 0)
- dev_warn(&client->dev, "setup failed, %d\n", ret);
- }
- return 0;
- err_exit:
- regulator_disable(chip->regulator);
- return ret;
- }
- static int pca953x_remove(struct i2c_client *client)
- {
- struct pca953x_platform_data *pdata = dev_get_platdata(&client->dev);
- struct pca953x_chip *chip = i2c_get_clientdata(client);
- int ret;
- if (pdata && pdata->teardown) {
- ret = pdata->teardown(client, chip->gpio_chip.base,
- chip->gpio_chip.ngpio, pdata->context);
- if (ret < 0)
- dev_err(&client->dev, "teardown failed, %d\n", ret);
- } else {
- ret = 0;
- }
- regulator_disable(chip->regulator);
- return ret;
- }
- #ifdef CONFIG_PM_SLEEP
- static int pca953x_regcache_sync(struct device *dev)
- {
- struct pca953x_chip *chip = dev_get_drvdata(dev);
- int ret;
- /*
- * The ordering between direction and output is important,
- * sync these registers first and only then sync the rest.
- */
- ret = regcache_sync_region(chip->regmap, chip->regs->direction,
- chip->regs->direction + NBANK(chip));
- if (ret) {
- dev_err(dev, "Failed to sync GPIO dir registers: %d\n", ret);
- return ret;
- }
- ret = regcache_sync_region(chip->regmap, chip->regs->output,
- chip->regs->output + NBANK(chip));
- if (ret) {
- dev_err(dev, "Failed to sync GPIO out registers: %d\n", ret);
- return ret;
- }
- #ifdef CONFIG_GPIO_PCA953X_IRQ
- if (chip->driver_data & PCA_PCAL) {
- ret = regcache_sync_region(chip->regmap, PCAL953X_IN_LATCH,
- PCAL953X_IN_LATCH + NBANK(chip));
- if (ret) {
- dev_err(dev, "Failed to sync INT latch registers: %d\n",
- ret);
- return ret;
- }
- ret = regcache_sync_region(chip->regmap, PCAL953X_INT_MASK,
- PCAL953X_INT_MASK + NBANK(chip));
- if (ret) {
- dev_err(dev, "Failed to sync INT mask registers: %d\n",
- ret);
- return ret;
- }
- }
- #endif
- return 0;
- }
- static int pca953x_suspend(struct device *dev)
- {
- struct pca953x_chip *chip = dev_get_drvdata(dev);
- regcache_cache_only(chip->regmap, true);
- if (atomic_read(&chip->wakeup_path))
- device_set_wakeup_path(dev);
- else
- regulator_disable(chip->regulator);
- return 0;
- }
- static int pca953x_resume(struct device *dev)
- {
- struct pca953x_chip *chip = dev_get_drvdata(dev);
- int ret;
- if (!atomic_read(&chip->wakeup_path)) {
- ret = regulator_enable(chip->regulator);
- if (ret) {
- dev_err(dev, "Failed to enable regulator: %d\n", ret);
- return 0;
- }
- }
- regcache_cache_only(chip->regmap, false);
- regcache_mark_dirty(chip->regmap);
- ret = pca953x_regcache_sync(dev);
- if (ret)
- return ret;
- ret = regcache_sync(chip->regmap);
- if (ret) {
- dev_err(dev, "Failed to restore register map: %d\n", ret);
- return ret;
- }
- return 0;
- }
- #endif
- /* convenience to stop overlong match-table lines */
- #define OF_953X(__nrgpio, __int) (void *)(__nrgpio | PCA953X_TYPE | __int)
- #define OF_957X(__nrgpio, __int) (void *)(__nrgpio | PCA957X_TYPE | __int)
- static const struct of_device_id pca953x_dt_ids[] = {
- { .compatible = "nxp,pca6416", .data = OF_953X(16, PCA_INT), },
- { .compatible = "nxp,pca9505", .data = OF_953X(40, PCA_INT), },
- { .compatible = "nxp,pca9534", .data = OF_953X( 8, PCA_INT), },
- { .compatible = "nxp,pca9535", .data = OF_953X(16, PCA_INT), },
- { .compatible = "nxp,pca9536", .data = OF_953X( 4, 0), },
- { .compatible = "nxp,pca9537", .data = OF_953X( 4, PCA_INT), },
- { .compatible = "nxp,pca9538", .data = OF_953X( 8, PCA_INT), },
- { .compatible = "nxp,pca9539", .data = OF_953X(16, PCA_INT), },
- { .compatible = "nxp,pca9554", .data = OF_953X( 8, PCA_INT), },
- { .compatible = "nxp,pca9555", .data = OF_953X(16, PCA_INT), },
- { .compatible = "nxp,pca9556", .data = OF_953X( 8, 0), },
- { .compatible = "nxp,pca9557", .data = OF_953X( 8, 0), },
- { .compatible = "nxp,pca9574", .data = OF_957X( 8, PCA_INT), },
- { .compatible = "nxp,pca9575", .data = OF_957X(16, PCA_INT), },
- { .compatible = "nxp,pca9698", .data = OF_953X(40, 0), },
- { .compatible = "nxp,pcal6416", .data = OF_953X(16, PCA_LATCH_INT), },
- { .compatible = "nxp,pcal6524", .data = OF_953X(24, PCA_LATCH_INT), },
- { .compatible = "nxp,pcal9535", .data = OF_953X(16, PCA_LATCH_INT), },
- { .compatible = "nxp,pcal9554b", .data = OF_953X( 8, PCA_LATCH_INT), },
- { .compatible = "nxp,pcal9555a", .data = OF_953X(16, PCA_LATCH_INT), },
- { .compatible = "maxim,max7310", .data = OF_953X( 8, 0), },
- { .compatible = "maxim,max7312", .data = OF_953X(16, PCA_INT), },
- { .compatible = "maxim,max7313", .data = OF_953X(16, PCA_INT), },
- { .compatible = "maxim,max7315", .data = OF_953X( 8, PCA_INT), },
- { .compatible = "maxim,max7318", .data = OF_953X(16, PCA_INT), },
- { .compatible = "ti,pca6107", .data = OF_953X( 8, PCA_INT), },
- { .compatible = "ti,pca9536", .data = OF_953X( 4, 0), },
- { .compatible = "ti,tca6408", .data = OF_953X( 8, PCA_INT), },
- { .compatible = "ti,tca6416", .data = OF_953X(16, PCA_INT), },
- { .compatible = "ti,tca6424", .data = OF_953X(24, PCA_INT), },
- { .compatible = "ti,tca9539", .data = OF_953X(16, PCA_INT), },
- { .compatible = "onnn,cat9554", .data = OF_953X( 8, PCA_INT), },
- { .compatible = "onnn,pca9654", .data = OF_953X( 8, PCA_INT), },
- { .compatible = "onnn,pca9655", .data = OF_953X(16, PCA_INT), },
- { .compatible = "exar,xra1202", .data = OF_953X( 8, 0), },
- { }
- };
- MODULE_DEVICE_TABLE(of, pca953x_dt_ids);
- static SIMPLE_DEV_PM_OPS(pca953x_pm_ops, pca953x_suspend, pca953x_resume);
- static struct i2c_driver pca953x_driver = {
- .driver = {
- .name = "pca953x",
- .pm = &pca953x_pm_ops,
- .of_match_table = pca953x_dt_ids,
- .acpi_match_table = pca953x_acpi_ids,
- },
- .probe = pca953x_probe,
- .remove = pca953x_remove,
- .id_table = pca953x_id,
- };
- static int __init pca953x_init(void)
- {
- return i2c_add_driver(&pca953x_driver);
- }
- /* 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)
- {
- i2c_del_driver(&pca953x_driver);
- }
- module_exit(pca953x_exit);
- MODULE_AUTHOR("eric miao <eric.miao@marvell.com>");
- MODULE_DESCRIPTION("GPIO expander driver for PCA953x");
- MODULE_LICENSE("GPL");
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