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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-11 08:27:49 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-11 08:27:49 +0000
commitace9429bb58fd418f0c81d4c2835699bddf6bde6 (patch)
treeb2d64bc10158fdd5497876388cd68142ca374ed3 /drivers/pinctrl/pinctrl-mcp23s08.c
parentInitial commit. (diff)
downloadlinux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.tar.xz
linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.zip
Adding upstream version 6.6.15.upstream/6.6.15
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'drivers/pinctrl/pinctrl-mcp23s08.c')
-rw-r--r--drivers/pinctrl/pinctrl-mcp23s08.c692
1 files changed, 692 insertions, 0 deletions
diff --git a/drivers/pinctrl/pinctrl-mcp23s08.c b/drivers/pinctrl/pinctrl-mcp23s08.c
new file mode 100644
index 0000000000..4551575e4e
--- /dev/null
+++ b/drivers/pinctrl/pinctrl-mcp23s08.c
@@ -0,0 +1,692 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/* MCP23S08 SPI/I2C GPIO driver */
+
+#include <linux/bitops.h>
+#include <linux/kernel.h>
+#include <linux/device.h>
+#include <linux/mutex.h>
+#include <linux/mod_devicetable.h>
+#include <linux/module.h>
+#include <linux/export.h>
+#include <linux/gpio/driver.h>
+#include <linux/gpio/consumer.h>
+#include <linux/seq_file.h>
+#include <linux/slab.h>
+#include <asm/byteorder.h>
+#include <linux/interrupt.h>
+#include <linux/regmap.h>
+#include <linux/pinctrl/pinctrl.h>
+#include <linux/pinctrl/pinconf.h>
+#include <linux/pinctrl/pinconf-generic.h>
+
+#include "pinctrl-mcp23s08.h"
+
+/* 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
+
+static const struct reg_default mcp23x08_defaults[] = {
+ {.reg = MCP_IODIR, .def = 0xff},
+ {.reg = MCP_IPOL, .def = 0x00},
+ {.reg = MCP_GPINTEN, .def = 0x00},
+ {.reg = MCP_DEFVAL, .def = 0x00},
+ {.reg = MCP_INTCON, .def = 0x00},
+ {.reg = MCP_IOCON, .def = 0x00},
+ {.reg = MCP_GPPU, .def = 0x00},
+ {.reg = MCP_OLAT, .def = 0x00},
+};
+
+static const struct regmap_range mcp23x08_volatile_range = {
+ .range_min = MCP_INTF,
+ .range_max = MCP_GPIO,
+};
+
+static const struct regmap_access_table mcp23x08_volatile_table = {
+ .yes_ranges = &mcp23x08_volatile_range,
+ .n_yes_ranges = 1,
+};
+
+static const struct regmap_range mcp23x08_precious_range = {
+ .range_min = MCP_GPIO,
+ .range_max = MCP_GPIO,
+};
+
+static const struct regmap_access_table mcp23x08_precious_table = {
+ .yes_ranges = &mcp23x08_precious_range,
+ .n_yes_ranges = 1,
+};
+
+const struct regmap_config mcp23x08_regmap = {
+ .reg_bits = 8,
+ .val_bits = 8,
+
+ .reg_stride = 1,
+ .volatile_table = &mcp23x08_volatile_table,
+ .precious_table = &mcp23x08_precious_table,
+ .reg_defaults = mcp23x08_defaults,
+ .num_reg_defaults = ARRAY_SIZE(mcp23x08_defaults),
+ .cache_type = REGCACHE_FLAT,
+ .max_register = MCP_OLAT,
+};
+EXPORT_SYMBOL_GPL(mcp23x08_regmap);
+
+static const struct reg_default mcp23x17_defaults[] = {
+ {.reg = MCP_IODIR << 1, .def = 0xffff},
+ {.reg = MCP_IPOL << 1, .def = 0x0000},
+ {.reg = MCP_GPINTEN << 1, .def = 0x0000},
+ {.reg = MCP_DEFVAL << 1, .def = 0x0000},
+ {.reg = MCP_INTCON << 1, .def = 0x0000},
+ {.reg = MCP_IOCON << 1, .def = 0x0000},
+ {.reg = MCP_GPPU << 1, .def = 0x0000},
+ {.reg = MCP_OLAT << 1, .def = 0x0000},
+};
+
+static const struct regmap_range mcp23x17_volatile_range = {
+ .range_min = MCP_INTF << 1,
+ .range_max = MCP_GPIO << 1,
+};
+
+static const struct regmap_access_table mcp23x17_volatile_table = {
+ .yes_ranges = &mcp23x17_volatile_range,
+ .n_yes_ranges = 1,
+};
+
+static const struct regmap_range mcp23x17_precious_range = {
+ .range_min = MCP_INTCAP << 1,
+ .range_max = MCP_GPIO << 1,
+};
+
+static const struct regmap_access_table mcp23x17_precious_table = {
+ .yes_ranges = &mcp23x17_precious_range,
+ .n_yes_ranges = 1,
+};
+
+const struct regmap_config mcp23x17_regmap = {
+ .reg_bits = 8,
+ .val_bits = 16,
+
+ .reg_stride = 2,
+ .max_register = MCP_OLAT << 1,
+ .volatile_table = &mcp23x17_volatile_table,
+ .precious_table = &mcp23x17_precious_table,
+ .reg_defaults = mcp23x17_defaults,
+ .num_reg_defaults = ARRAY_SIZE(mcp23x17_defaults),
+ .cache_type = REGCACHE_FLAT,
+ .val_format_endian = REGMAP_ENDIAN_LITTLE,
+};
+EXPORT_SYMBOL_GPL(mcp23x17_regmap);
+
+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_bits(struct mcp23s08 *mcp, unsigned int reg,
+ unsigned int mask, unsigned int val)
+{
+ return regmap_update_bits(mcp->regmap, reg << mcp->reg_shift,
+ mask, val);
+}
+
+static int mcp_set_bit(struct mcp23s08 *mcp, unsigned int reg,
+ unsigned int pin, bool enabled)
+{
+ u16 mask = BIT(pin);
+ return mcp_update_bits(mcp, reg, mask, enabled ? mask : 0);
+}
+
+static const struct pinctrl_pin_desc mcp23x08_pins[] = {
+ PINCTRL_PIN(0, "gpio0"),
+ PINCTRL_PIN(1, "gpio1"),
+ PINCTRL_PIN(2, "gpio2"),
+ PINCTRL_PIN(3, "gpio3"),
+ PINCTRL_PIN(4, "gpio4"),
+ PINCTRL_PIN(5, "gpio5"),
+ PINCTRL_PIN(6, "gpio6"),
+ PINCTRL_PIN(7, "gpio7"),
+};
+
+static const struct pinctrl_pin_desc mcp23x17_pins[] = {
+ PINCTRL_PIN(0, "gpio0"),
+ PINCTRL_PIN(1, "gpio1"),
+ PINCTRL_PIN(2, "gpio2"),
+ PINCTRL_PIN(3, "gpio3"),
+ PINCTRL_PIN(4, "gpio4"),
+ PINCTRL_PIN(5, "gpio5"),
+ PINCTRL_PIN(6, "gpio6"),
+ PINCTRL_PIN(7, "gpio7"),
+ PINCTRL_PIN(8, "gpio8"),
+ PINCTRL_PIN(9, "gpio9"),
+ PINCTRL_PIN(10, "gpio10"),
+ PINCTRL_PIN(11, "gpio11"),
+ PINCTRL_PIN(12, "gpio12"),
+ PINCTRL_PIN(13, "gpio13"),
+ PINCTRL_PIN(14, "gpio14"),
+ PINCTRL_PIN(15, "gpio15"),
+};
+
+static int mcp_pinctrl_get_groups_count(struct pinctrl_dev *pctldev)
+{
+ return 0;
+}
+
+static const char *mcp_pinctrl_get_group_name(struct pinctrl_dev *pctldev,
+ unsigned int group)
+{
+ return NULL;
+}
+
+static int mcp_pinctrl_get_group_pins(struct pinctrl_dev *pctldev,
+ unsigned int group,
+ const unsigned int **pins,
+ unsigned int *num_pins)
+{
+ return -ENOTSUPP;
+}
+
+static const struct pinctrl_ops mcp_pinctrl_ops = {
+ .get_groups_count = mcp_pinctrl_get_groups_count,
+ .get_group_name = mcp_pinctrl_get_group_name,
+ .get_group_pins = mcp_pinctrl_get_group_pins,
+#ifdef CONFIG_OF
+ .dt_node_to_map = pinconf_generic_dt_node_to_map_pin,
+ .dt_free_map = pinconf_generic_dt_free_map,
+#endif
+};
+
+static int mcp_pinconf_get(struct pinctrl_dev *pctldev, unsigned int pin,
+ unsigned long *config)
+{
+ struct mcp23s08 *mcp = pinctrl_dev_get_drvdata(pctldev);
+ enum pin_config_param param = pinconf_to_config_param(*config);
+ unsigned int data, status;
+ int ret;
+
+ switch (param) {
+ case PIN_CONFIG_BIAS_PULL_UP:
+ ret = mcp_read(mcp, MCP_GPPU, &data);
+ if (ret < 0)
+ return ret;
+ status = (data & BIT(pin)) ? 1 : 0;
+ break;
+ default:
+ return -ENOTSUPP;
+ }
+
+ *config = 0;
+
+ return status ? 0 : -EINVAL;
+}
+
+static int mcp_pinconf_set(struct pinctrl_dev *pctldev, unsigned int pin,
+ unsigned long *configs, unsigned int num_configs)
+{
+ struct mcp23s08 *mcp = pinctrl_dev_get_drvdata(pctldev);
+ enum pin_config_param param;
+ u32 arg;
+ int ret = 0;
+ int i;
+
+ for (i = 0; i < num_configs; i++) {
+ param = pinconf_to_config_param(configs[i]);
+ arg = pinconf_to_config_argument(configs[i]);
+
+ switch (param) {
+ case PIN_CONFIG_BIAS_PULL_UP:
+ ret = mcp_set_bit(mcp, MCP_GPPU, pin, arg);
+ break;
+ default:
+ dev_dbg(mcp->dev, "Invalid config param %04x\n", param);
+ return -ENOTSUPP;
+ }
+ }
+
+ return ret;
+}
+
+static const struct pinconf_ops mcp_pinconf_ops = {
+ .pin_config_get = mcp_pinconf_get,
+ .pin_config_set = mcp_pinconf_set,
+ .is_generic = true,
+};
+
+/*----------------------------------------------------------------------*/
+
+static int mcp23s08_direction_input(struct gpio_chip *chip, unsigned offset)
+{
+ struct mcp23s08 *mcp = gpiochip_get_data(chip);
+ int status;
+
+ mutex_lock(&mcp->lock);
+ status = mcp_set_bit(mcp, MCP_IODIR, offset, true);
+ 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->cached_gpio = status;
+ status = !!(status & (1 << offset));
+ }
+
+ mutex_unlock(&mcp->lock);
+ return status;
+}
+
+static int mcp23s08_get_multiple(struct gpio_chip *chip,
+ unsigned long *mask, unsigned long *bits)
+{
+ struct mcp23s08 *mcp = gpiochip_get_data(chip);
+ unsigned int status;
+ int 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->cached_gpio = status;
+ *bits = status;
+ }
+
+ mutex_unlock(&mcp->lock);
+ return ret;
+}
+
+static int __mcp23s08_set(struct mcp23s08 *mcp, unsigned mask, bool value)
+{
+ return mcp_update_bits(mcp, MCP_OLAT, mask, value ? mask : 0);
+}
+
+static void mcp23s08_set(struct gpio_chip *chip, unsigned offset, int value)
+{
+ struct mcp23s08 *mcp = gpiochip_get_data(chip);
+ unsigned mask = BIT(offset);
+
+ mutex_lock(&mcp->lock);
+ __mcp23s08_set(mcp, mask, !!value);
+ mutex_unlock(&mcp->lock);
+}
+
+static void mcp23s08_set_multiple(struct gpio_chip *chip,
+ unsigned long *mask, unsigned long *bits)
+{
+ struct mcp23s08 *mcp = gpiochip_get_data(chip);
+
+ mutex_lock(&mcp->lock);
+ mcp_update_bits(mcp, MCP_OLAT, *mask, *bits);
+ 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 = BIT(offset);
+ int status;
+
+ mutex_lock(&mcp->lock);
+ status = __mcp23s08_set(mcp, mask, value);
+ if (status == 0) {
+ status = mcp_update_bits(mcp, MCP_IODIR, mask, 0);
+ }
+ mutex_unlock(&mcp->lock);
+ return status;
+}
+
+/*----------------------------------------------------------------------*/
+static irqreturn_t mcp23s08_irq(int irq, void *data)
+{
+ struct mcp23s08 *mcp = data;
+ int intcap, intcon, intf, i, gpio, gpio_orig, intcap_mask, defval;
+ 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))
+ goto unlock;
+
+ if (intf == 0) {
+ /* There is no interrupt pending */
+ goto unlock;
+ }
+
+ if (mcp_read(mcp, MCP_INTCAP, &intcap))
+ goto unlock;
+
+ if (mcp_read(mcp, MCP_INTCON, &intcon))
+ goto unlock;
+
+ if (mcp_read(mcp, MCP_DEFVAL, &defval))
+ goto unlock;
+
+ /* This clears the interrupt(configurable on S18) */
+ if (mcp_read(mcp, MCP_GPIO, &gpio))
+ goto unlock;
+
+ gpio_orig = mcp->cached_gpio;
+ mcp->cached_gpio = gpio;
+ mutex_unlock(&mcp->lock);
+
+ 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 = intf & BIT(i);
+ 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 &
+ (intcap & BIT(i))) !=
+ (intcap_mask & (BIT(i) & gpio_orig));
+ gpio_set = BIT(i) & gpio;
+ gpio_bit_changed = (BIT(i) & gpio_orig) !=
+ (BIT(i) & gpio);
+ defval_changed = (BIT(i) & intcon) &&
+ ((BIT(i) & gpio) !=
+ (BIT(i) & 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.irq.domain, i);
+ handle_nested_irq(child_irq);
+ }
+ }
+
+ return IRQ_HANDLED;
+
+unlock:
+ mutex_unlock(&mcp->lock);
+ 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 = irqd_to_hwirq(data);
+
+ mcp_set_bit(mcp, MCP_GPINTEN, pos, false);
+ gpiochip_disable_irq(gc, 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 = irqd_to_hwirq(data);
+
+ gpiochip_enable_irq(gc, pos);
+ mcp_set_bit(mcp, MCP_GPINTEN, pos, true);
+}
+
+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 = irqd_to_hwirq(data);
+
+ if ((type & IRQ_TYPE_EDGE_BOTH) == IRQ_TYPE_EDGE_BOTH) {
+ mcp_set_bit(mcp, MCP_INTCON, pos, false);
+ mcp->irq_rise |= BIT(pos);
+ mcp->irq_fall |= BIT(pos);
+ } else if (type & IRQ_TYPE_EDGE_RISING) {
+ mcp_set_bit(mcp, MCP_INTCON, pos, false);
+ mcp->irq_rise |= BIT(pos);
+ mcp->irq_fall &= ~BIT(pos);
+ } else if (type & IRQ_TYPE_EDGE_FALLING) {
+ mcp_set_bit(mcp, MCP_INTCON, pos, false);
+ mcp->irq_rise &= ~BIT(pos);
+ mcp->irq_fall |= BIT(pos);
+ } else if (type & IRQ_TYPE_LEVEL_HIGH) {
+ mcp_set_bit(mcp, MCP_INTCON, pos, true);
+ mcp_set_bit(mcp, MCP_DEFVAL, pos, false);
+ } else if (type & IRQ_TYPE_LEVEL_LOW) {
+ mcp_set_bit(mcp, MCP_INTCON, pos, true);
+ mcp_set_bit(mcp, MCP_DEFVAL, pos, true);
+ } else
+ return -EINVAL;
+
+ return 0;
+}
+
+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->lock);
+ regcache_cache_only(mcp->regmap, true);
+}
+
+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);
+
+ regcache_cache_only(mcp->regmap, false);
+ regcache_sync(mcp->regmap);
+
+ mutex_unlock(&mcp->lock);
+}
+
+static int mcp23s08_irq_setup(struct mcp23s08 *mcp)
+{
+ struct gpio_chip *chip = &mcp->chip;
+ int err;
+ unsigned long irqflags = IRQF_ONESHOT | IRQF_SHARED;
+
+ 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;
+ }
+
+ return 0;
+}
+
+static void mcp23s08_irq_print_chip(struct irq_data *d, struct seq_file *p)
+{
+ struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
+ struct mcp23s08 *mcp = gpiochip_get_data(gc);
+
+ seq_printf(p, dev_name(mcp->dev));
+}
+
+static const struct irq_chip mcp23s08_irq_chip = {
+ .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,
+ .irq_print_chip = mcp23s08_irq_print_chip,
+ .flags = IRQCHIP_IMMUTABLE,
+ GPIOCHIP_IRQ_RESOURCE_HELPERS,
+};
+
+/*----------------------------------------------------------------------*/
+
+int mcp23s08_probe_one(struct mcp23s08 *mcp, struct device *dev,
+ unsigned int addr, unsigned int type, unsigned int base)
+{
+ int status, ret;
+ bool mirror = false;
+ bool open_drain = 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.get_multiple = mcp23s08_get_multiple;
+ mcp->chip.direction_output = mcp23s08_direction_output;
+ mcp->chip.set = mcp23s08_set;
+ mcp->chip.set_multiple = mcp23s08_set_multiple;
+
+ mcp->chip.base = base;
+ mcp->chip.can_sleep = true;
+ mcp->chip.parent = dev;
+ mcp->chip.owner = THIS_MODULE;
+
+ mcp->reset_gpio = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_LOW);
+
+ /* 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)
+ return dev_err_probe(dev, ret, "can't identify chip %d\n", addr);
+
+ mcp->irq_controller =
+ device_property_read_bool(dev, "interrupt-controller");
+ if (mcp->irq && mcp->irq_controller) {
+ mcp->irq_active_high =
+ device_property_read_bool(dev,
+ "microchip,irq-active-high");
+
+ mirror = device_property_read_bool(dev, "microchip,irq-mirror");
+ open_drain = device_property_read_bool(dev, "drive-open-drain");
+ }
+
+ if ((status & IOCON_SEQOP) || !(status & IOCON_HAEN) || mirror ||
+ mcp->irq_active_high || open_drain) {
+ /* 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 (open_drain)
+ status |= IOCON_ODR | (IOCON_ODR << 8);
+
+ if (type == MCP_TYPE_S18 || type == MCP_TYPE_018)
+ status |= IOCON_INTCC | (IOCON_INTCC << 8);
+
+ ret = mcp_write(mcp, MCP_IOCON, status);
+ if (ret < 0)
+ return dev_err_probe(dev, ret, "can't write IOCON %d\n", addr);
+ }
+
+ if (mcp->irq && mcp->irq_controller) {
+ struct gpio_irq_chip *girq = &mcp->chip.irq;
+
+ gpio_irq_chip_set_chip(girq, &mcp23s08_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;
+ }
+
+ ret = devm_gpiochip_add_data(dev, &mcp->chip, mcp);
+ if (ret < 0)
+ return dev_err_probe(dev, ret, "can't add GPIO chip\n");
+
+ mcp->pinctrl_desc.pctlops = &mcp_pinctrl_ops;
+ mcp->pinctrl_desc.confops = &mcp_pinconf_ops;
+ mcp->pinctrl_desc.npins = mcp->chip.ngpio;
+ if (mcp->pinctrl_desc.npins == 8)
+ mcp->pinctrl_desc.pins = mcp23x08_pins;
+ else if (mcp->pinctrl_desc.npins == 16)
+ mcp->pinctrl_desc.pins = mcp23x17_pins;
+ mcp->pinctrl_desc.owner = THIS_MODULE;
+
+ mcp->pctldev = devm_pinctrl_register(dev, &mcp->pinctrl_desc, mcp);
+ if (IS_ERR(mcp->pctldev))
+ return dev_err_probe(dev, PTR_ERR(mcp->pctldev), "can't register controller\n");
+
+ if (mcp->irq) {
+ ret = mcp23s08_irq_setup(mcp);
+ if (ret)
+ return dev_err_probe(dev, ret, "can't setup IRQ\n");
+ }
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(mcp23s08_probe_one);
+
+MODULE_LICENSE("GPL");