/* * PCA953x 4/8/16/24/40 bit I/O ports * * Copyright (C) 2005 Ben Gardner * Copyright (C) 2007 Marvell International Ltd. * * Derived from drivers/i2c/chips/pca9539.c * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; version 2 of the License. */ #include #include #include #include #include #include #include #include #include #include #include #include #include #define PCA953X_INPUT 0x00 #define PCA953X_OUTPUT 0x01 #define PCA953X_INVERT 0x02 #define PCA953X_DIRECTION 0x03 #define REG_ADDR_MASK 0x3f #define REG_ADDR_EXT 0x40 #define REG_ADDR_AI 0x80 #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 0x00FF #define PCAL_GPIO_MASK 0x1f #define PCAL_PINCTRL_MASK 0x60 #define PCA_INT 0x0100 #define PCA_PCAL 0x0200 #define PCA_LATCH_INT (PCA_PCAL | PCA_INT) #define PCA953X_TYPE 0x1000 #define PCA957X_TYPE 0x2000 #define PCA_TYPE_MASK 0xF000 #define PCA_CHIP_TYPE(x) ((x) & PCA_TYPE_MASK) static const struct i2c_device_id pca953x_id[] = { { "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, }, { "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); 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 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; u8 irq_mask[MAX_BANK]; u8 irq_stat[MAX_BANK]; u8 irq_trig_raise[MAX_BANK]; u8 irq_trig_fall[MAX_BANK]; struct irq_chip irq_chip; #endif 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, .cache_type = REGCACHE_RBTREE, .max_register = 0x7f, }; static u8 pca953x_recalc_addr(struct pca953x_chip *chip, int reg, int off, bool write, bool addrinc) { 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); /* Single byte read doesn't need AI bit set. */ if (!addrinc) return regaddr; /* Chips with 24 and more GPIOs always support Auto Increment */ if (write && NBANK(chip) > 2) regaddr |= REG_ADDR_AI; /* PCA9575 needs address-increment on multi-byte writes */ if (PCA_CHIP_TYPE(chip->driver_data) == PCA957X_TYPE) regaddr |= REG_ADDR_AI; return regaddr; } static int pca953x_write_regs(struct pca953x_chip *chip, int reg, u8 *val) { u8 regaddr = pca953x_recalc_addr(chip, reg, 0, true, true); int ret; ret = regmap_bulk_write(chip->regmap, regaddr, val, 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, u8 *val) { u8 regaddr = pca953x_recalc_addr(chip, reg, 0, false, true); int ret; ret = regmap_bulk_read(chip->regmap, regaddr, val, NBANK(chip)); if (ret < 0) { dev_err(&chip->client->dev, "failed reading register\n"); return ret; } 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, true, false); 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, true, false); u8 outreg = pca953x_recalc_addr(chip, chip->regs->output, off, true, false); 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, true, false); 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) { /* NOTE: diagnostic already emitted; that's all we should * do unless gpio_*_value_cansleep() calls become different * from their nonsleeping siblings (and report faults). */ return 0; } 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, true, false); 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, true, false); 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; return !!(reg_val & bit); } static void pca953x_gpio_set_multiple(struct gpio_chip *gc, unsigned long *mask, unsigned long *bits) { struct pca953x_chip *chip = gpiochip_get_data(gc); unsigned int bank_mask, bank_val; int bank; u8 reg_val[MAX_BANK]; int ret; mutex_lock(&chip->i2c_lock); ret = pca953x_read_regs(chip, chip->regs->output, reg_val); if (ret) goto exit; for (bank = 0; bank < NBANK(chip); bank++) { bank_mask = mask[bank / sizeof(*mask)] >> ((bank % sizeof(*mask)) * 8); if (bank_mask) { bank_val = bits[bank / sizeof(*bits)] >> ((bank % sizeof(*bits)) * 8); bank_val &= bank_mask; reg_val[bank] = (reg_val[bank] & ~bank_mask) | bank_val; } } 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, true, false); u8 pull_sel_reg = pca953x_recalc_addr(chip, PCAL953X_PULL_SEL, offset, true, false); 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); /* Disable pull-up/pull-down */ ret = regmap_write_bits(chip->regmap, pull_en_reg, bit, 0); if (ret) goto exit; /* 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); if (ret) goto exit; /* Enable pull-up/pull-down */ 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 (config) { case PIN_CONFIG_BIAS_PULL_UP: case PIN_CONFIG_BIAS_PULL_DOWN: 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->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); chip->irq_mask[d->hwirq / BANK_SZ] &= ~(1 << (d->hwirq % BANK_SZ)); } 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); chip->irq_mask[d->hwirq / BANK_SZ] |= 1 << (d->hwirq % BANK_SZ); } 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); 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); u8 new_irqs; int level, i; u8 invert_irq_mask[MAX_BANK]; int reg_direction[MAX_BANK]; regmap_bulk_read(chip->regmap, chip->regs->direction, reg_direction, NBANK(chip)); if (chip->driver_data & PCA_PCAL) { /* Enable latch on interrupt-enabled inputs */ pca953x_write_regs(chip, PCAL953X_IN_LATCH, chip->irq_mask); for (i = 0; i < NBANK(chip); i++) invert_irq_mask[i] = ~chip->irq_mask[i]; /* Unmask enabled interrupts */ pca953x_write_regs(chip, PCAL953X_INT_MASK, invert_irq_mask); } /* Look for any newly setup interrupt */ for (i = 0; i < NBANK(chip); i++) { new_irqs = chip->irq_trig_fall[i] | chip->irq_trig_raise[i]; new_irqs &= reg_direction[i]; while (new_irqs) { level = __ffs(new_irqs); pca953x_gpio_direction_input(&chip->gpio_chip, level + (BANK_SZ * i)); new_irqs &= ~(1 << 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); int bank_nb = d->hwirq / BANK_SZ; u8 mask = 1 << (d->hwirq % BANK_SZ); if (!(type & IRQ_TYPE_EDGE_BOTH)) { dev_err(&chip->client->dev, "irq %d: unsupported type %d\n", d->irq, type); return -EINVAL; } if (type & IRQ_TYPE_EDGE_FALLING) chip->irq_trig_fall[bank_nb] |= mask; else chip->irq_trig_fall[bank_nb] &= ~mask; if (type & IRQ_TYPE_EDGE_RISING) chip->irq_trig_raise[bank_nb] |= mask; else chip->irq_trig_raise[bank_nb] &= ~mask; 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); u8 mask = 1 << (d->hwirq % BANK_SZ); chip->irq_trig_raise[d->hwirq / BANK_SZ] &= ~mask; chip->irq_trig_fall[d->hwirq / BANK_SZ] &= ~mask; } static bool pca953x_irq_pending(struct pca953x_chip *chip, u8 *pending) { u8 cur_stat[MAX_BANK]; u8 old_stat[MAX_BANK]; bool pending_seen = false; bool trigger_seen = false; u8 trigger[MAX_BANK]; int reg_direction[MAX_BANK]; int ret, i; 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, PCA953X_INPUT, cur_stat); if (ret) return false; for (i = 0; i < NBANK(chip); i++) { /* Apply filter for rising/falling edge selection */ pending[i] = (~cur_stat[i] & chip->irq_trig_fall[i]) | (cur_stat[i] & chip->irq_trig_raise[i]); pending[i] &= trigger[i]; if (pending[i]) pending_seen = true; } return pending_seen; } ret = pca953x_read_regs(chip, chip->regs->input, cur_stat); if (ret) return false; /* Remove output pins from the equation */ regmap_bulk_read(chip->regmap, chip->regs->direction, reg_direction, NBANK(chip)); for (i = 0; i < NBANK(chip); i++) cur_stat[i] &= reg_direction[i]; memcpy(old_stat, chip->irq_stat, NBANK(chip)); for (i = 0; i < NBANK(chip); i++) { trigger[i] = (cur_stat[i] ^ old_stat[i]) & chip->irq_mask[i]; if (trigger[i]) trigger_seen = true; } if (!trigger_seen) return false; memcpy(chip->irq_stat, cur_stat, NBANK(chip)); for (i = 0; i < NBANK(chip); i++) { pending[i] = (old_stat[i] & chip->irq_trig_fall[i]) | (cur_stat[i] & chip->irq_trig_raise[i]); pending[i] &= trigger[i]; if (pending[i]) pending_seen = true; } return pending_seen; } static irqreturn_t pca953x_irq_handler(int irq, void *devid) { struct pca953x_chip *chip = devid; u8 pending[MAX_BANK]; u8 level; unsigned nhandled = 0; int i; if (!pca953x_irq_pending(chip, pending)) return IRQ_NONE; for (i = 0; i < NBANK(chip); i++) { while (pending[i]) { level = __ffs(pending[i]); handle_nested_irq(irq_find_mapping(chip->gpio_chip.irq.domain, level + (BANK_SZ * i))); pending[i] &= ~(1 << level); nhandled++; } } return (nhandled > 0) ? IRQ_HANDLED : IRQ_NONE; } 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; int reg_direction[MAX_BANK]; int ret, i; 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, chip->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. */ regmap_bulk_read(chip->regmap, chip->regs->direction, reg_direction, NBANK(chip)); for (i = 0; i < NBANK(chip); i++) chip->irq_stat[i] &= reg_direction[i]; mutex_init(&chip->irq_lock); ret = devm_request_threaded_irq(&client->dev, client->irq, NULL, pca953x_irq_handler, IRQF_TRIGGER_LOW | 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; } irq_chip->name = dev_name(&chip->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; ret = gpiochip_irqchip_add_nested(&chip->gpio_chip, irq_chip, irq_base, handle_simple_irq, IRQ_TYPE_NONE); if (ret) { dev_err(&client->dev, "could not connect irqchip to gpiochip\n"); return ret; } gpiochip_set_nested_irqchip(&chip->gpio_chip, irq_chip, client->irq); 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) { int ret; u8 val[MAX_BANK]; ret = regcache_sync_region(chip->regmap, chip->regs->output, chip->regs->output + NBANK(chip)); if (ret != 0) goto out; ret = regcache_sync_region(chip->regmap, chip->regs->direction, chip->regs->direction + NBANK(chip)); if (ret != 0) goto out; /* set platform specific polarity inversion */ if (invert) memset(val, 0xFF, NBANK(chip)); else memset(val, 0, NBANK(chip)); ret = pca953x_write_regs(chip, chip->regs->invert, val); out: return ret; } static int device_pca957x_init(struct pca953x_chip *chip, u32 invert) { int ret; u8 val[MAX_BANK]; ret = device_pca95xx_init(chip, invert); if (ret) goto out; /* To enable register 6, 7 to control pull up and pull down */ memset(val, 0x02, NBANK(chip)); ret = pca953x_write_regs(chip, PCA957X_BKEN, val); if (ret) goto out; return 0; out: return ret; } static const struct of_device_id pca953x_dt_ids[]; 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; chip = devm_kzalloc(&client->dev, sizeof(struct pca953x_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)) { ret = PTR_ERR(reg); if (ret != -EPROBE_DEFER) dev_err(&client->dev, "reg get err: %d\n", ret); return ret; } 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 struct acpi_device_id *acpi_id; struct device *dev = &client->dev; chip->driver_data = (uintptr_t)of_device_get_match_data(dev); if (!chip->driver_data) { acpi_id = acpi_match_device(pca953x_acpi_ids, dev); if (!acpi_id) { ret = -ENODEV; goto err_exit; } chip->driver_data = acpi_id->driver_data; } } i2c_set_clientdata(client, chip); chip->regmap = devm_regmap_init_i2c(client, &pca953x_i2c_regmap); 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. */ pca953x_setup_gpio(chip, chip->driver_data & PCA_GPIO_MASK); 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 = devm_gpiochip_add_data(&client->dev, &chip->gpio_chip, chip); if (ret) goto err_exit; ret = pca953x_irq_setup(chip, irq_base); 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, "%s failed, %d\n", "teardown", 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 != 0) { 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 != 0) { 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 != 0) { 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 != 0) { 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); regulator_disable(chip->regulator); return 0; } static int pca953x_resume(struct device *dev) { struct pca953x_chip *chip = dev_get_drvdata(dev); int ret; ret = regulator_enable(chip->regulator); if (ret != 0) { 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 != 0) { 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,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,pcal6524", .data = OF_953X(24, 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 = "onnn,cat9554", .data = OF_953X( 8, PCA_INT), }, { .compatible = "onnn,pca9654", .data = OF_953X( 8, 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 = ACPI_PTR(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 "); MODULE_DESCRIPTION("GPIO expander driver for PCA953x"); MODULE_LICENSE("GPL");