diff options
Diffstat (limited to 'drivers/gpio')
| -rw-r--r-- | drivers/gpio/Kconfig | 17 | ||||
| -rw-r--r-- | drivers/gpio/Makefile | 1 | ||||
| -rw-r--r-- | drivers/gpio/gpio-mcp23s08.c | 1047 |
3 files changed, 0 insertions, 1065 deletions
diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig index 23ca51ee6b28..5f88d7324e02 100644 --- a/drivers/gpio/Kconfig +++ b/drivers/gpio/Kconfig @@ -1227,23 +1227,6 @@ config GPIO_PISOSR endmenu -menu "SPI or I2C GPIO expanders" - depends on (SPI_MASTER && !I2C) || I2C - -config GPIO_MCP23S08 - tristate "Microchip MCP23xxx I/O expander" - depends on OF_GPIO - select GPIOLIB_IRQCHIP - select REGMAP_I2C if I2C - select REGMAP if SPI_MASTER - help - SPI/I2C driver for Microchip MCP23S08/MCP23S17/MCP23008/MCP23017 - I/O expanders. - This provides a GPIO interface supporting inputs and outputs. - The I2C versions of the chips can be used as interrupt-controller. - -endmenu - menu "USB GPIO expanders" depends on USB diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile index 68b96277d9fa..89f10061a5c1 100644 --- a/drivers/gpio/Makefile +++ b/drivers/gpio/Makefile @@ -77,7 +77,6 @@ obj-$(CONFIG_GPIO_MENZ127) += gpio-menz127.o obj-$(CONFIG_GPIO_MERRIFIELD) += gpio-merrifield.o obj-$(CONFIG_GPIO_MC33880) += gpio-mc33880.o obj-$(CONFIG_GPIO_MC9S08DZ60) += gpio-mc9s08dz60.o -obj-$(CONFIG_GPIO_MCP23S08) += gpio-mcp23s08.o obj-$(CONFIG_GPIO_ML_IOH) += gpio-ml-ioh.o obj-$(CONFIG_GPIO_MM_LANTIQ) += gpio-mm-lantiq.o obj-$(CONFIG_GPIO_MOCKUP) += gpio-mockup.o diff --git a/drivers/gpio/gpio-mcp23s08.c b/drivers/gpio/gpio-mcp23s08.c deleted file mode 100644 index 2a57d024481d..000000000000 --- a/drivers/gpio/gpio-mcp23s08.c +++ /dev/null @@ -1,1047 +0,0 @@ -/* - * MCP23S08 SPI/I2C GPIO gpio expander driver - * - * The inputs and outputs of the mcp23s08, mcp23s17, mcp23008 and mcp23017 are - * supported. - * For the I2C versions of the chips (mcp23008 and mcp23017) generation of - * interrupts is also supported. - * The hardware of the SPI versions of the chips (mcp23s08 and mcp23s17) is - * also capable of generating interrupts, but the linux driver does not - * support that yet. - */ - -#include <linux/kernel.h> -#include <linux/device.h> -#include <linux/mutex.h> -#include <linux/module.h> -#include <linux/gpio.h> -#include <linux/i2c.h> -#include <linux/spi/spi.h> -#include <linux/spi/mcp23s08.h> -#include <linux/slab.h> -#include <asm/byteorder.h> -#include <linux/interrupt.h> -#include <linux/of_irq.h> -#include <linux/of_device.h> -#include <linux/regmap.h> - -/** - * MCP types supported by driver - */ -#define MCP_TYPE_S08 0 -#define MCP_TYPE_S17 1 -#define MCP_TYPE_008 2 -#define MCP_TYPE_017 3 -#define MCP_TYPE_S18 4 - -/* Registers are all 8 bits wide. - * - * The mcp23s17 has twice as many bits, and can be configured to work - * with either 16 bit registers or with two adjacent 8 bit banks. - */ -#define MCP_IODIR 0x00 /* init/reset: all ones */ -#define MCP_IPOL 0x01 -#define MCP_GPINTEN 0x02 -#define MCP_DEFVAL 0x03 -#define MCP_INTCON 0x04 -#define MCP_IOCON 0x05 -# define IOCON_MIRROR (1 << 6) -# define IOCON_SEQOP (1 << 5) -# define IOCON_HAEN (1 << 3) -# define IOCON_ODR (1 << 2) -# define IOCON_INTPOL (1 << 1) -# define IOCON_INTCC (1) -#define MCP_GPPU 0x06 -#define MCP_INTF 0x07 -#define MCP_INTCAP 0x08 -#define MCP_GPIO 0x09 -#define MCP_OLAT 0x0a - -struct mcp23s08; - -struct mcp23s08 { - u8 addr; - bool irq_active_high; - bool reg_shift; - - u16 cache[11]; - u16 irq_rise; - u16 irq_fall; - int irq; - bool irq_controller; - /* lock protects the cached values */ - struct mutex lock; - struct mutex irq_lock; - - struct gpio_chip chip; - - struct regmap *regmap; - struct device *dev; -}; - -static const struct regmap_config mcp23x08_regmap = { - .reg_bits = 8, - .val_bits = 8, - - .reg_stride = 1, - .max_register = MCP_OLAT, -}; - -static const struct regmap_config mcp23x17_regmap = { - .reg_bits = 8, - .val_bits = 16, - - .reg_stride = 2, - .max_register = MCP_OLAT << 1, - .val_format_endian = REGMAP_ENDIAN_LITTLE, -}; - -/*----------------------------------------------------------------------*/ - -#ifdef CONFIG_SPI_MASTER - -static int mcp23sxx_spi_write(void *context, const void *data, size_t count) -{ - struct mcp23s08 *mcp = context; - struct spi_device *spi = to_spi_device(mcp->dev); - struct spi_message m; - struct spi_transfer t[2] = { { .tx_buf = &mcp->addr, .len = 1, }, - { .tx_buf = data, .len = count, }, }; - - spi_message_init(&m); - spi_message_add_tail(&t[0], &m); - spi_message_add_tail(&t[1], &m); - - return spi_sync(spi, &m); -} - -static int mcp23sxx_spi_gather_write(void *context, - const void *reg, size_t reg_size, - const void *val, size_t val_size) -{ - struct mcp23s08 *mcp = context; - struct spi_device *spi = to_spi_device(mcp->dev); - struct spi_message m; - struct spi_transfer t[3] = { { .tx_buf = &mcp->addr, .len = 1, }, - { .tx_buf = reg, .len = reg_size, }, - { .tx_buf = val, .len = val_size, }, }; - - spi_message_init(&m); - spi_message_add_tail(&t[0], &m); - spi_message_add_tail(&t[1], &m); - spi_message_add_tail(&t[2], &m); - - return spi_sync(spi, &m); -} - -static int mcp23sxx_spi_read(void *context, const void *reg, size_t reg_size, - void *val, size_t val_size) -{ - struct mcp23s08 *mcp = context; - struct spi_device *spi = to_spi_device(mcp->dev); - u8 tx[2]; - - if (reg_size != 1) - return -EINVAL; - - tx[0] = mcp->addr | 0x01; - tx[1] = *((u8 *) reg); - - return spi_write_then_read(spi, tx, sizeof(tx), val, val_size); -} - -static const struct regmap_bus mcp23sxx_spi_regmap = { - .write = mcp23sxx_spi_write, - .gather_write = mcp23sxx_spi_gather_write, - .read = mcp23sxx_spi_read, -}; - -#endif /* CONFIG_SPI_MASTER */ - -static int mcp_read(struct mcp23s08 *mcp, unsigned int reg, unsigned int *val) -{ - return regmap_read(mcp->regmap, reg << mcp->reg_shift, val); -} - -static int mcp_write(struct mcp23s08 *mcp, unsigned int reg, unsigned int val) -{ - return regmap_write(mcp->regmap, reg << mcp->reg_shift, val); -} - -static int mcp_update_cache(struct mcp23s08 *mcp) -{ - int ret, reg, i; - - for (i = 0; i < ARRAY_SIZE(mcp->cache); i++) { - ret = mcp_read(mcp, i, ®); - if (ret < 0) - return ret; - mcp->cache[i] = reg; - } - - return 0; -} - -/*----------------------------------------------------------------------*/ - -/* A given spi_device can represent up to eight mcp23sxx chips - * sharing the same chipselect but using different addresses - * (e.g. chips #0 and #3 might be populated, but not #1 or $2). - * Driver data holds all the per-chip data. - */ -struct mcp23s08_driver_data { - unsigned ngpio; - struct mcp23s08 *mcp[8]; - struct mcp23s08 chip[]; -}; - - -static int mcp23s08_direction_input(struct gpio_chip *chip, unsigned offset) -{ - struct mcp23s08 *mcp = gpiochip_get_data(chip); - int status; - - mutex_lock(&mcp->lock); - mcp->cache[MCP_IODIR] |= (1 << offset); - status = mcp_write(mcp, MCP_IODIR, mcp->cache[MCP_IODIR]); - mutex_unlock(&mcp->lock); - return status; -} - -static int mcp23s08_get(struct gpio_chip *chip, unsigned offset) -{ - struct mcp23s08 *mcp = gpiochip_get_data(chip); - int status, ret; - - mutex_lock(&mcp->lock); - - /* REVISIT reading this clears any IRQ ... */ - ret = mcp_read(mcp, MCP_GPIO, &status); - if (ret < 0) - status = 0; - else { - mcp->cache[MCP_GPIO] = status; - status = !!(status & (1 << offset)); - } - mutex_unlock(&mcp->lock); - return status; -} - -static int __mcp23s08_set(struct mcp23s08 *mcp, unsigned mask, int value) -{ - unsigned olat = mcp->cache[MCP_OLAT]; - - if (value) - olat |= mask; - else - olat &= ~mask; - mcp->cache[MCP_OLAT] = olat; - return mcp_write(mcp, MCP_OLAT, olat); -} - -static void mcp23s08_set(struct gpio_chip *chip, unsigned offset, int value) -{ - struct mcp23s08 *mcp = gpiochip_get_data(chip); - unsigned mask = 1 << offset; - - mutex_lock(&mcp->lock); - __mcp23s08_set(mcp, mask, value); - mutex_unlock(&mcp->lock); -} - -static int -mcp23s08_direction_output(struct gpio_chip *chip, unsigned offset, int value) -{ - struct mcp23s08 *mcp = gpiochip_get_data(chip); - unsigned mask = 1 << offset; - int status; - - mutex_lock(&mcp->lock); - status = __mcp23s08_set(mcp, mask, value); - if (status == 0) { - mcp->cache[MCP_IODIR] &= ~mask; - status = mcp_write(mcp, MCP_IODIR, mcp->cache[MCP_IODIR]); - } - mutex_unlock(&mcp->lock); - return status; -} - -/*----------------------------------------------------------------------*/ -static irqreturn_t mcp23s08_irq(int irq, void *data) -{ - struct mcp23s08 *mcp = data; - int intcap, intf, i, gpio, gpio_orig, intcap_mask; - unsigned int child_irq; - bool intf_set, intcap_changed, gpio_bit_changed, - defval_changed, gpio_set; - - mutex_lock(&mcp->lock); - if (mcp_read(mcp, MCP_INTF, &intf) < 0) { - mutex_unlock(&mcp->lock); - return IRQ_HANDLED; - } - - mcp->cache[MCP_INTF] = intf; - - if (mcp_read(mcp, MCP_INTCAP, &intcap) < 0) { - mutex_unlock(&mcp->lock); - return IRQ_HANDLED; - } - - mcp->cache[MCP_INTCAP] = intcap; - - /* This clears the interrupt(configurable on S18) */ - if (mcp_read(mcp, MCP_GPIO, &gpio) < 0) { - mutex_unlock(&mcp->lock); - return IRQ_HANDLED; - } - gpio_orig = mcp->cache[MCP_GPIO]; - mcp->cache[MCP_GPIO] = gpio; - mutex_unlock(&mcp->lock); - - if (mcp->cache[MCP_INTF] == 0) { - /* There is no interrupt pending */ - return IRQ_HANDLED; - } - - dev_dbg(mcp->chip.parent, - "intcap 0x%04X intf 0x%04X gpio_orig 0x%04X gpio 0x%04X\n", - intcap, intf, gpio_orig, gpio); - - for (i = 0; i < mcp->chip.ngpio; i++) { - /* We must check all of the inputs on the chip, - * otherwise we may not notice a change on >=2 pins. - * - * On at least the mcp23s17, INTCAP is only updated - * one byte at a time(INTCAPA and INTCAPB are - * not written to at the same time - only on a per-bank - * basis). - * - * INTF only contains the single bit that caused the - * interrupt per-bank. On the mcp23s17, there is - * INTFA and INTFB. If two pins are changed on the A - * side at the same time, INTF will only have one bit - * set. If one pin on the A side and one pin on the B - * side are changed at the same time, INTF will have - * two bits set. Thus, INTF can't be the only check - * to see if the input has changed. - */ - - intf_set = BIT(i) & mcp->cache[MCP_INTF]; - if (i < 8 && intf_set) - intcap_mask = 0x00FF; - else if (i >= 8 && intf_set) - intcap_mask = 0xFF00; - else - intcap_mask = 0x00; - - intcap_changed = (intcap_mask & - (BIT(i) & mcp->cache[MCP_INTCAP])) != - (intcap_mask & (BIT(i) & gpio_orig)); - gpio_set = BIT(i) & mcp->cache[MCP_GPIO]; - gpio_bit_changed = (BIT(i) & gpio_orig) != - (BIT(i) & mcp->cache[MCP_GPIO]); - defval_changed = (BIT(i) & mcp->cache[MCP_INTCON]) && - ((BIT(i) & mcp->cache[MCP_GPIO]) != - (BIT(i) & mcp->cache[MCP_DEFVAL])); - - if (((gpio_bit_changed || intcap_changed) && - (BIT(i) & mcp->irq_rise) && gpio_set) || - ((gpio_bit_changed || intcap_changed) && - (BIT(i) & mcp->irq_fall) && !gpio_set) || - defval_changed) { - child_irq = irq_find_mapping(mcp->chip.irqdomain, i); - handle_nested_irq(child_irq); - } - } - - return IRQ_HANDLED; -} - -static void mcp23s08_irq_mask(struct irq_data *data) -{ - struct gpio_chip *gc = irq_data_get_irq_chip_data(data); - struct mcp23s08 *mcp = gpiochip_get_data(gc); - unsigned int pos = data->hwirq; - - mcp->cache[MCP_GPINTEN] &= ~BIT(pos); -} - -static void mcp23s08_irq_unmask(struct irq_data *data) -{ - struct gpio_chip *gc = irq_data_get_irq_chip_data(data); - struct mcp23s08 *mcp = gpiochip_get_data(gc); - unsigned int pos = data->hwirq; - - mcp->cache[MCP_GPINTEN] |= BIT(pos); -} - -static int mcp23s08_irq_set_type(struct irq_data *data, unsigned int type) -{ - struct gpio_chip *gc = irq_data_get_irq_chip_data(data); - struct mcp23s08 *mcp = gpiochip_get_data(gc); - unsigned int pos = data->hwirq; - int status = 0; - - if ((type & IRQ_TYPE_EDGE_BOTH) == IRQ_TYPE_EDGE_BOTH) { - mcp->cache[MCP_INTCON] &= ~BIT(pos); - mcp->irq_rise |= BIT(pos); - mcp->irq_fall |= BIT(pos); - } else if (type & IRQ_TYPE_EDGE_RISING) { - mcp->cache[MCP_INTCON] &= ~BIT(pos); - mcp->irq_rise |= BIT(pos); - mcp->irq_fall &= ~BIT(pos); - } else if (type & IRQ_TYPE_EDGE_FALLING) { - mcp->cache[MCP_INTCON] &= ~BIT(pos); - mcp->irq_rise &= ~BIT(pos); - mcp->irq_fall |= BIT(pos); - } else if (type & IRQ_TYPE_LEVEL_HIGH) { - mcp->cache[MCP_INTCON] |= BIT(pos); - mcp->cache[MCP_DEFVAL] &= ~BIT(pos); - } else if (type & IRQ_TYPE_LEVEL_LOW) { - mcp->cache[MCP_INTCON] |= BIT(pos); - mcp->cache[MCP_DEFVAL] |= BIT(pos); - } else - return -EINVAL; - - return status; -} - -static void mcp23s08_irq_bus_lock(struct irq_data *data) -{ - struct gpio_chip *gc = irq_data_get_irq_chip_data(data); - struct mcp23s08 *mcp = gpiochip_get_data(gc); - - mutex_lock(&mcp->irq_lock); -} - -static void mcp23s08_irq_bus_unlock(struct irq_data *data) -{ - struct gpio_chip *gc = irq_data_get_irq_chip_data(data); - struct mcp23s08 *mcp = gpiochip_get_data(gc); - - mutex_lock(&mcp->lock); - mcp_write(mcp, MCP_GPINTEN, mcp->cache[MCP_GPINTEN]); - mcp_write(mcp, MCP_DEFVAL, mcp->cache[MCP_DEFVAL]); - mcp_write(mcp, MCP_INTCON, mcp->cache[MCP_INTCON]); - mutex_unlock(&mcp->lock); - mutex_unlock(&mcp->irq_lock); -} - -static struct irq_chip mcp23s08_irq_chip = { - .name = "gpio-mcp23xxx", - .irq_mask = mcp23s08_irq_mask, - .irq_unmask = mcp23s08_irq_unmask, - .irq_set_type = mcp23s08_irq_set_type, - .irq_bus_lock = mcp23s08_irq_bus_lock, - .irq_bus_sync_unlock = mcp23s08_irq_bus_unlock, -}; - -static int mcp23s08_irq_setup(struct mcp23s08 *mcp) -{ - struct gpio_chip *chip = &mcp->chip; - int err; - unsigned long irqflags = IRQF_ONESHOT | IRQF_SHARED; - - mutex_init(&mcp->irq_lock); - - if (mcp->irq_active_high) - irqflags |= IRQF_TRIGGER_HIGH; - else - irqflags |= IRQF_TRIGGER_LOW; - - err = devm_request_threaded_irq(chip->parent, mcp->irq, NULL, - mcp23s08_irq, - irqflags, dev_name(chip->parent), mcp); - if (err != 0) { - dev_err(chip->parent, "unable to request IRQ#%d: %d\n", - mcp->irq, err); - return err; - } - - err = gpiochip_irqchip_add_nested(chip, - &mcp23s08_irq_chip, - 0, - handle_simple_irq, - IRQ_TYPE_NONE); - if (err) { - dev_err(chip->parent, - "could not connect irqchip to gpiochip: %d\n", err); - return err; - } - - gpiochip_set_nested_irqchip(chip, - &mcp23s08_irq_chip, - mcp->irq); - - return 0; -} - -/*----------------------------------------------------------------------*/ - -#ifdef CONFIG_DEBUG_FS - -#include <linux/seq_file.h> - -/* - * This shows more info than the generic gpio dump code: - * pullups, deglitching, open drain drive. - */ -static void mcp23s08_dbg_show(struct seq_file *s, struct gpio_chip *chip) -{ - struct mcp23s08 *mcp; - char bank; - int t; - unsigned mask; - - mcp = gpiochip_get_data(chip); - - /* NOTE: we only handle one bank for now ... */ - bank = '0' + ((mcp->addr >> 1) & 0x7); - - mutex_lock(&mcp->lock); - t = mcp_update_cache(mcp); - if (t < 0) { - seq_printf(s, " I/O ERROR %d\n", t); - goto done; - } - - for (t = 0, mask = 1; t < chip->ngpio; t++, mask <<= 1) { - const char *label; - - label = gpiochip_is_requested(chip, t); - if (!label) - continue; - - seq_printf(s, " gpio-%-3d P%c.%d (%-12s) %s %s %s", - chip->base + t, bank, t, label, - (mcp->cache[MCP_IODIR] & mask) ? "in " : "out", - (mcp->cache[MCP_GPIO] & mask) ? "hi" : "lo", - (mcp->cache[MCP_GPPU] & mask) ? "up" : " "); - /* NOTE: ignoring the irq-related registers */ - seq_puts(s, "\n"); - } -done: - mutex_unlock(&mcp->lock); -} - -#else -#define mcp23s08_dbg_show NULL -#endif - -/*----------------------------------------------------------------------*/ - -static int mcp23s08_probe_one(struct mcp23s08 *mcp, struct device *dev, - void *data, unsigned addr, unsigned type, - struct mcp23s08_platform_data *pdata, int cs) -{ - int status, ret; - bool mirror = false; - - mutex_init(&mcp->lock); - - mcp->dev = dev; - mcp->addr = addr; - mcp->irq_active_high = false; - - mcp->chip.direction_input = mcp23s08_direction_input; - mcp->chip.get = mcp23s08_get; - mcp->chip.direction_output = mcp23s08_direction_output; - mcp->chip.set = mcp23s08_set; - mcp->chip.dbg_show = mcp23s08_dbg_show; -#ifdef CONFIG_OF_GPIO - mcp->chip.of_gpio_n_cells = 2; - mcp->chip.of_node = dev->of_node; -#endif - - switch (type) { -#ifdef CONFIG_SPI_MASTER - case MCP_TYPE_S08: - mcp->regmap = devm_regmap_init(dev, &mcp23sxx_spi_regmap, mcp, - &mcp23x08_regmap); - mcp->reg_shift = 0; - mcp->chip.ngpio = 8; - mcp->chip.label = "mcp23s08"; - break; - - case MCP_TYPE_S17: - mcp->regmap = devm_regmap_init(dev, &mcp23sxx_spi_regmap, mcp, - &mcp23x17_regmap); - mcp->reg_shift = 1; - mcp->chip.ngpio = 16; - mcp->chip.label = "mcp23s17"; - break; - - case MCP_TYPE_S18: - mcp->regmap = devm_regmap_init(dev, &mcp23sxx_spi_regmap, mcp, - &mcp23x17_regmap); - mcp->reg_shift = 1; - mcp->chip.ngpio = 16; - mcp->chip.label = "mcp23s18"; - break; -#endif /* CONFIG_SPI_MASTER */ - -#if IS_ENABLED(CONFIG_I2C) - case MCP_TYPE_008: - mcp->regmap = devm_regmap_init_i2c(data, &mcp23x08_regmap); - mcp->reg_shift = 0; - mcp->chip.ngpio = 8; - mcp->chip.label = "mcp23008"; - break; - - case MCP_TYPE_017: - mcp->regmap = devm_regmap_init_i2c(data, &mcp23x17_regmap); - mcp->reg_shift = 1; - mcp->chip.ngpio = 16; - mcp->chip.label = "mcp23017"; - break; -#endif /* CONFIG_I2C */ - - default: - dev_err(dev, "invalid device type (%d)\n", type); - return -EINVAL; - } - - if (IS_ERR(mcp->regmap)) - return PTR_ERR(mcp->regmap); - - mcp->chip.base = pdata->base; - mcp->chip.can_sleep = true; - mcp->chip.parent = dev; - mcp->chip.owner = THIS_MODULE; - - /* verify MCP_IOCON.SEQOP = 0, so sequential reads work, - * and MCP_IOCON.HAEN = 1, so we work with all chips. - */ - - ret = mcp_read(mcp, MCP_IOCON, &status); - if (ret < 0) - goto fail; - - mcp->irq_controller = pdata->irq_controller; - if (mcp->irq && mcp->irq_controller) { - mcp->irq_active_high = - of_property_read_bool(mcp->chip.parent->of_node, - "microchip,irq-active-high"); - - mirror = pdata->mirror; - } - - if ((status & IOCON_SEQOP) || !(status & IOCON_HAEN) || mirror || - mcp->irq_active_high) { - /* mcp23s17 has IOCON twice, make sure they are in sync */ - status &= ~(IOCON_SEQOP | (IOCON_SEQOP << 8)); - status |= IOCON_HAEN | (IOCON_HAEN << 8); - if (mcp->irq_active_high) - status |= IOCON_INTPOL | (IOCON_INTPOL << 8); - else - status &= ~(IOCON_INTPOL | (IOCON_INTPOL << 8)); - - if (mirror) - status |= IOCON_MIRROR | (IOCON_MIRROR << 8); - - if (type == MCP_TYPE_S18) - status |= IOCON_INTCC | (IOCON_INTCC << 8); - - ret = mcp_write(mcp, MCP_IOCON, status); - if (ret < 0) - goto fail; - } - - /* configure ~100K pullups */ - ret = mcp_write(mcp, MCP_GPPU, pdata->chip[cs].pullups); - if (ret < 0) - goto fail; - - ret = mcp_update_cache(mcp); - if (ret < 0) - goto fail; - - /* disable inverter on input */ - if (mcp->cache[MCP_IPOL] != 0) { - mcp->cache[MCP_IPOL] = 0; - ret = mcp_write(mcp, MCP_IPOL, 0); - if (ret < 0) - goto fail; - } - - /* disable irqs */ - if (mcp->cache[MCP_GPINTEN] != 0) { - mcp->cache[MCP_GPINTEN] = 0; - ret = mcp_write(mcp, MCP_GPINTEN, 0); - if (ret < 0) - goto fail; - } - - ret = gpiochip_add_data(&mcp->chip, mcp); - if (ret < 0) - goto fail; - - if (mcp->irq && mcp->irq_controller) { - ret = mcp23s08_irq_setup(mcp); - if (ret) - goto fail; - } -fail: - if (ret < 0) - dev_dbg(dev, "can't setup chip %d, --> %d\n", addr, ret); - return ret; -} - -/*----------------------------------------------------------------------*/ - -#ifdef CONFIG_OF -#ifdef CONFIG_SPI_MASTER -static const struct of_device_id mcp23s08_spi_of_match[] = { - { - .compatible = "microchip,mcp23s08", - .data = (void *) MCP_TYPE_S08, - }, - { - .compatible = "microchip,mcp23s17", - .data = (void *) MCP_TYPE_S17, - }, - { - .compatible = "microchip,mcp23s18", - .data = (void *) MCP_TYPE_S18, - }, -/* NOTE: The use of the mcp prefix is deprecated and will be removed. */ - { - .compatible = "mcp,mcp23s08", - .data = (void *) MCP_TYPE_S08, - }, - { - .compatible = "mcp,mcp23s17", - .data = (void *) MCP_TYPE_S17, - }, - { }, -}; -MODULE_DEVICE_TABLE(of, mcp23s08_spi_of_match); -#endif - -#if IS_ENABLED(CONFIG_I2C) -static const struct of_device_id mcp23s08_i2c_of_match[] = { - { - .compatible = "microchip,mcp23008", - .data = (void *) MCP_TYPE_008, - }, - { - .compatible = "microchip,mcp23017", - .data = (void *) MCP_TYPE_017, - }, -/* NOTE: The use of the mcp prefix is deprecated and will be removed. */ - { - .compatible = "mcp,mcp23008", - .data = (void *) MCP_TYPE_008, - }, - { - .compatible = "mcp,mcp23017", - .data = (void *) MCP_TYPE_017, - }, - { }, -}; -MODULE_DEVICE_TABLE(of, mcp23s08_i2c_of_match); -#endif -#endif /* CONFIG_OF */ - - -#if IS_ENABLED(CONFIG_I2C) - -static int mcp230xx_probe(struct i2c_client *client, - const struct i2c_device_id *id) -{ - struct mcp23s08_platform_data *pdata, local_pdata; - struct mcp23s08 *mcp; - int status; - const struct of_device_id *match; - - match = of_match_device(of_match_ptr(mcp23s08_i2c_of_match), - &client->dev); - if (match) { - pdata = &local_pdata; - pdata->base = -1; - pdata->chip[0].pullups = 0; - pdata->irq_controller = of_property_read_bool( - client->dev.of_node, - "interrupt-controller"); - pdata->mirror = of_property_read_bool(client->dev.of_node, - "microchip,irq-mirror"); - client->irq = irq_of_parse_and_map(client->dev.of_node, 0); - } else { - pdata = dev_get_platdata(&client->dev); - if (!pdata) { - pdata = devm_kzalloc(&client->dev, - sizeof(struct mcp23s08_platform_data), - GFP_KERNEL); - if (!pdata) - return -ENOMEM; - pdata->base = -1; - } - } - - mcp = kzalloc(sizeof(*mcp), GFP_KERNEL); - if (!mcp) - return -ENOMEM; - - mcp->irq = client->irq; - status = mcp23s08_probe_one(mcp, &client->dev, client, client->addr, - id->driver_data, pdata, 0); - if (status) - goto fail; - - i2c_set_clientdata(client, mcp); - - return 0; - -fail: - kfree(mcp); - - return status; -} - -static int mcp230xx_remove(struct i2c_client *client) -{ - struct mcp23s08 *mcp = i2c_get_clientdata(client); - - gpiochip_remove(&mcp->chip); - kfree(mcp); - - return 0; -} - -static const struct i2c_device_id mcp230xx_id[] = { - { "mcp23008", MCP_TYPE_008 }, - { "mcp23017", MCP_TYPE_017 }, - { }, -}; -MODULE_DEVICE_TABLE(i2c, mcp230xx_id); - -static struct i2c_driver mcp230xx_driver = { - .driver = { - .name = "mcp230xx", - .of_match_table = of_match_ptr(mcp23s08_i2c_of_match), - }, - .probe = mcp230xx_probe, - .remove = mcp230xx_remove, - .id_table = mcp230xx_id, -}; - -static int __init mcp23s08_i2c_init(void) -{ - return i2c_add_driver(&mcp230xx_driver); -} - -static void mcp23s08_i2c_exit(void) -{ - i2c_del_driver(&mcp230xx_driver); -} - -#else - -static int __init mcp23s08_i2c_init(void) { return 0; } -static void mcp23s08_i2c_exit(void) { } - -#endif /* CONFIG_I2C */ - -/*----------------------------------------------------------------------*/ - -#ifdef CONFIG_SPI_MASTER - -static int mcp23s08_probe(struct spi_device *spi) -{ - struct mcp23s08_platform_data *pdata, local_pdata; - unsigned addr; - int chips = 0; - struct mcp23s08_driver_data *data; - int status, type; - unsigned ngpio = 0; - const struct of_device_id *match; - u32 spi_present_mask = 0; - - match = of_match_device(of_match_ptr(mcp23s08_spi_of_match), &spi->dev); - if (match) { - type = (int)(uintptr_t)match->data; - status = of_property_read_u32(spi->dev.of_node, - "microchip,spi-present-mask", &spi_present_mask); - if (status) { - status = of_property_read_u32(spi->dev.of_node, - "mcp,spi-present-mask", &spi_present_mask); - if (status) { - dev_err(&spi->dev, - "DT has no spi-present-mask\n"); - return -ENODEV; - } - } - if ((spi_present_mask <= 0) || (spi_present_mask >= 256)) { - dev_err(&spi->dev, "invalid spi-present-mask\n"); - return -ENODEV; - } - - pdata = &local_pdata; - pdata->base = -1; - for (addr = 0; addr < ARRAY_SIZE(pdata->chip); addr++) { - pdata->chip[addr].pullups = 0; - if (spi_present_mask & (1 << addr)) - chips++; - } - pdata->irq_controller = of_property_read_bool( - spi->dev.of_node, - "interrupt-controller"); - pdata->mirror = of_property_read_bool(spi->dev.of_node, - "microchip,irq-mirror"); - } else { - type = spi_get_device_id(spi)->driver_data; - pdata = dev_get_platdata(&spi->dev); - if (!pdata) { - pdata = devm_kzalloc(&spi->dev, - sizeof(struct mcp23s08_platform_data), - GFP_KERNEL); - pdata->base = -1; - } - - for (addr = 0; addr < ARRAY_SIZE(pdata->chip); addr++) { - if (!pdata->chip[addr].is_present) - continue; - chips++; - if ((type == MCP_TYPE_S08) && (addr > 3)) { - dev_err(&spi->dev, - "mcp23s08 only supports address 0..3\n"); - return -EINVAL; - } - spi_present_mask |= 1 << addr; - } - } - - if (!chips) - return -ENODEV; - - data = devm_kzalloc(&spi->dev, - sizeof(*data) + chips * sizeof(struct mcp23s08), - GFP_KERNEL); - if (!data) - return -ENOMEM; - - spi_set_drvdata(spi, data); - - spi->irq = irq_of_parse_and_map(spi->dev.of_node, 0); - - for (addr = 0; addr < ARRAY_SIZE(pdata->chip); addr++) { - if (!(spi_present_mask & (1 << addr))) - continue; - chips--; - data->mcp[addr] = &data->chip[chips]; - data->mcp[addr]->irq = spi->irq; - status = mcp23s08_probe_one(data->mcp[addr], &spi->dev, spi, - 0x40 | (addr << 1), type, pdata, - addr); - if (status < 0) - goto fail; - - if (pdata->base != -1) - pdata->base += data->mcp[addr]->chip.ngpio; - ngpio += data->mcp[addr]->chip.ngpio; - } - data->ngpio = ngpio; - - /* NOTE: these chips have a relatively sane IRQ framework, with - * per-signal masking and level/edge triggering. It's not yet - * handled here... - */ - - return 0; - -fail: - for (addr = 0; addr < ARRAY_SIZE(data->mcp); addr++) { - - if (!data->mcp[addr]) - continue; - gpiochip_remove(&data->mcp[addr]->chip); - } - return status; -} - -static int mcp23s08_remove(struct spi_device *spi) -{ - struct mcp23s08_driver_data *data = spi_get_drvdata(spi); - unsigned addr; - - for (addr = 0; addr < ARRAY_SIZE(data->mcp); addr++) { - - if (!data->mcp[addr]) - continue; - - gpiochip_remove(&data->mcp[addr]->chip); - } - - return 0; -} - -static const struct spi_device_id mcp23s08_ids[] = { - { "mcp23s08", MCP_TYPE_S08 }, - { "mcp23s17", MCP_TYPE_S17 }, - { "mcp23s18", MCP_TYPE_S18 }, - { }, -}; -MODULE_DEVICE_TABLE(spi, mcp23s08_ids); - -static struct spi_driver mcp23s08_driver = { - .probe = mcp23s08_probe, - .remove = mcp23s08_remove, - .id_table = mcp23s08_ids, - .driver = { - .name = "mcp23s08", - .of_match_table = of_match_ptr(mcp23s08_spi_of_match), - }, -}; - -static int __init mcp23s08_spi_init(void) -{ - return spi_register_driver(&mcp23s08_driver); -} - -static void mcp23s08_spi_exit(void) -{ - spi_unregister_driver(&mcp23s08_driver); -} - -#else - -static int __init mcp23s08_spi_init(void) { return 0; } -static void mcp23s08_spi_exit(void) { } - -#endif /* CONFIG_SPI_MASTER */ - -/*----------------------------------------------------------------------*/ - -static int __init mcp23s08_init(void) -{ - int ret; - - ret = mcp23s08_spi_init(); - if (ret) - goto spi_fail; - - ret = mcp23s08_i2c_init(); - if (ret) - goto i2c_fail; - - return 0; - - i2c_fail: - mcp23s08_spi_exit(); - spi_fail: - return ret; -} -/* register after spi/i2c postcore initcall and before - * subsys initcalls that may rely on these GPIOs - */ -subsys_initcall(mcp23s08_init); - -static void __exit mcp23s08_exit(void) -{ - mcp23s08_spi_exit(); - mcp23s08_i2c_exit(); -} -module_exit(mcp23s08_exit); - -MODULE_LICENSE("GPL"); |