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path: root/kernel/drivers/gpio/gpio-pca953x.c
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-rw-r--r--kernel/drivers/gpio/gpio-pca953x.c784
1 files changed, 784 insertions, 0 deletions
diff --git a/kernel/drivers/gpio/gpio-pca953x.c b/kernel/drivers/gpio/gpio-pca953x.c
new file mode 100644
index 000000000..e2da64abb
--- /dev/null
+++ b/kernel/drivers/gpio/gpio-pca953x.c
@@ -0,0 +1,784 @@
+/*
+ * 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
+ *
+ * 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 <linux/module.h>
+#include <linux/init.h>
+#include <linux/gpio.h>
+#include <linux/interrupt.h>
+#include <linux/i2c.h>
+#include <linux/platform_data/pca953x.h>
+#include <linux/slab.h>
+#ifdef CONFIG_OF_GPIO
+#include <linux/of_platform.h>
+#endif
+
+#define PCA953X_INPUT 0
+#define PCA953X_OUTPUT 1
+#define PCA953X_INVERT 2
+#define PCA953X_DIRECTION 3
+
+#define REG_ADDR_AI 0x80
+
+#define PCA957X_IN 0
+#define PCA957X_INVRT 1
+#define PCA957X_BKEN 2
+#define PCA957X_PUPD 3
+#define PCA957X_CFG 4
+#define PCA957X_OUT 5
+#define PCA957X_MSK 6
+#define PCA957X_INTS 7
+
+#define PCA_GPIO_MASK 0x00FF
+#define PCA_INT 0x0100
+#define PCA953X_TYPE 0x1000
+#define PCA957X_TYPE 0x2000
+
+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, },
+
+ { "max7310", 8 | PCA953X_TYPE, },
+ { "max7312", 16 | PCA953X_TYPE | PCA_INT, },
+ { "max7313", 16 | PCA953X_TYPE | PCA_INT, },
+ { "max7315", 8 | 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, },
+ { "xra1202", 8 | PCA953X_TYPE },
+ { }
+};
+MODULE_DEVICE_TABLE(i2c, pca953x_id);
+
+#define MAX_BANK 5
+#define BANK_SZ 8
+
+#define NBANK(chip) (chip->gpio_chip.ngpio / BANK_SZ)
+
+struct pca953x_chip {
+ unsigned gpio_start;
+ u8 reg_output[MAX_BANK];
+ u8 reg_direction[MAX_BANK];
+ struct mutex i2c_lock;
+
+#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];
+#endif
+
+ struct i2c_client *client;
+ struct gpio_chip gpio_chip;
+ const char *const *names;
+ int chip_type;
+};
+
+static inline struct pca953x_chip *to_pca(struct gpio_chip *gc)
+{
+ return container_of(gc, struct pca953x_chip, gpio_chip);
+}
+
+static int pca953x_read_single(struct pca953x_chip *chip, int reg, u32 *val,
+ int off)
+{
+ int ret;
+ int bank_shift = fls((chip->gpio_chip.ngpio - 1) / BANK_SZ);
+ int offset = off / BANK_SZ;
+
+ ret = i2c_smbus_read_byte_data(chip->client,
+ (reg << bank_shift) + offset);
+ *val = ret;
+
+ if (ret < 0) {
+ dev_err(&chip->client->dev, "failed reading register\n");
+ return ret;
+ }
+
+ return 0;
+}
+
+static int pca953x_write_single(struct pca953x_chip *chip, int reg, u32 val,
+ int off)
+{
+ int ret = 0;
+ int bank_shift = fls((chip->gpio_chip.ngpio - 1) / BANK_SZ);
+ int offset = off / BANK_SZ;
+
+ ret = i2c_smbus_write_byte_data(chip->client,
+ (reg << bank_shift) + offset, val);
+
+ if (ret < 0) {
+ dev_err(&chip->client->dev, "failed writing register\n");
+ return ret;
+ }
+
+ return 0;
+}
+
+static int pca953x_write_regs(struct pca953x_chip *chip, int reg, u8 *val)
+{
+ int ret = 0;
+
+ if (chip->gpio_chip.ngpio <= 8)
+ ret = i2c_smbus_write_byte_data(chip->client, reg, *val);
+ else if (chip->gpio_chip.ngpio >= 24) {
+ int bank_shift = fls((chip->gpio_chip.ngpio - 1) / BANK_SZ);
+ ret = i2c_smbus_write_i2c_block_data(chip->client,
+ (reg << bank_shift) | REG_ADDR_AI,
+ NBANK(chip), val);
+ } else {
+ switch (chip->chip_type) {
+ case PCA953X_TYPE:
+ ret = i2c_smbus_write_word_data(chip->client,
+ reg << 1, (u16) *val);
+ break;
+ case PCA957X_TYPE:
+ ret = i2c_smbus_write_byte_data(chip->client, reg << 1,
+ val[0]);
+ if (ret < 0)
+ break;
+ ret = i2c_smbus_write_byte_data(chip->client,
+ (reg << 1) + 1,
+ val[1]);
+ break;
+ }
+ }
+
+ 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)
+{
+ int ret;
+
+ if (chip->gpio_chip.ngpio <= 8) {
+ ret = i2c_smbus_read_byte_data(chip->client, reg);
+ *val = ret;
+ } else if (chip->gpio_chip.ngpio >= 24) {
+ int bank_shift = fls((chip->gpio_chip.ngpio - 1) / BANK_SZ);
+
+ ret = i2c_smbus_read_i2c_block_data(chip->client,
+ (reg << bank_shift) | REG_ADDR_AI,
+ NBANK(chip), val);
+ } else {
+ ret = i2c_smbus_read_word_data(chip->client, reg << 1);
+ val[0] = (u16)ret & 0xFF;
+ val[1] = (u16)ret >> 8;
+ }
+ 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 = to_pca(gc);
+ u8 reg_val;
+ int ret, offset = 0;
+
+ mutex_lock(&chip->i2c_lock);
+ reg_val = chip->reg_direction[off / BANK_SZ] | (1u << (off % BANK_SZ));
+
+ switch (chip->chip_type) {
+ case PCA953X_TYPE:
+ offset = PCA953X_DIRECTION;
+ break;
+ case PCA957X_TYPE:
+ offset = PCA957X_CFG;
+ break;
+ }
+ ret = pca953x_write_single(chip, offset, reg_val, off);
+ if (ret)
+ goto exit;
+
+ chip->reg_direction[off / BANK_SZ] = reg_val;
+ ret = 0;
+exit:
+ 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 = to_pca(gc);
+ u8 reg_val;
+ int ret, offset = 0;
+
+ mutex_lock(&chip->i2c_lock);
+ /* set output level */
+ if (val)
+ reg_val = chip->reg_output[off / BANK_SZ]
+ | (1u << (off % BANK_SZ));
+ else
+ reg_val = chip->reg_output[off / BANK_SZ]
+ & ~(1u << (off % BANK_SZ));
+
+ switch (chip->chip_type) {
+ case PCA953X_TYPE:
+ offset = PCA953X_OUTPUT;
+ break;
+ case PCA957X_TYPE:
+ offset = PCA957X_OUT;
+ break;
+ }
+ ret = pca953x_write_single(chip, offset, reg_val, off);
+ if (ret)
+ goto exit;
+
+ chip->reg_output[off / BANK_SZ] = reg_val;
+
+ /* then direction */
+ reg_val = chip->reg_direction[off / BANK_SZ] & ~(1u << (off % BANK_SZ));
+ switch (chip->chip_type) {
+ case PCA953X_TYPE:
+ offset = PCA953X_DIRECTION;
+ break;
+ case PCA957X_TYPE:
+ offset = PCA957X_CFG;
+ break;
+ }
+ ret = pca953x_write_single(chip, offset, reg_val, off);
+ if (ret)
+ goto exit;
+
+ chip->reg_direction[off / BANK_SZ] = reg_val;
+ ret = 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 = to_pca(gc);
+ u32 reg_val;
+ int ret, offset = 0;
+
+ mutex_lock(&chip->i2c_lock);
+ switch (chip->chip_type) {
+ case PCA953X_TYPE:
+ offset = PCA953X_INPUT;
+ break;
+ case PCA957X_TYPE:
+ offset = PCA957X_IN;
+ break;
+ }
+ ret = pca953x_read_single(chip, offset, &reg_val, off);
+ 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 & (1u << (off % BANK_SZ))) ? 1 : 0;
+}
+
+static void pca953x_gpio_set_value(struct gpio_chip *gc, unsigned off, int val)
+{
+ struct pca953x_chip *chip = to_pca(gc);
+ u8 reg_val;
+ int ret, offset = 0;
+
+ mutex_lock(&chip->i2c_lock);
+ if (val)
+ reg_val = chip->reg_output[off / BANK_SZ]
+ | (1u << (off % BANK_SZ));
+ else
+ reg_val = chip->reg_output[off / BANK_SZ]
+ & ~(1u << (off % BANK_SZ));
+
+ switch (chip->chip_type) {
+ case PCA953X_TYPE:
+ offset = PCA953X_OUTPUT;
+ break;
+ case PCA957X_TYPE:
+ offset = PCA957X_OUT;
+ break;
+ }
+ ret = pca953x_write_single(chip, offset, reg_val, off);
+ if (ret)
+ goto exit;
+
+ chip->reg_output[off / BANK_SZ] = reg_val;
+exit:
+ mutex_unlock(&chip->i2c_lock);
+}
+
+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->can_sleep = true;
+
+ gc->base = chip->gpio_start;
+ gc->ngpio = gpios;
+ gc->label = chip->client->name;
+ gc->dev = &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 = to_pca(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 = to_pca(gc);
+
+ chip->irq_mask[d->hwirq / BANK_SZ] |= 1 << (d->hwirq % BANK_SZ);
+}
+
+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 = to_pca(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 = to_pca(gc);
+ u8 new_irqs;
+ int level, i;
+
+ /* 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 &= ~chip->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 = to_pca(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 struct irq_chip pca953x_irq_chip = {
+ .name = "pca953x",
+ .irq_mask = pca953x_irq_mask,
+ .irq_unmask = pca953x_irq_unmask,
+ .irq_bus_lock = pca953x_irq_bus_lock,
+ .irq_bus_sync_unlock = pca953x_irq_bus_sync_unlock,
+ .irq_set_type = pca953x_irq_set_type,
+};
+
+static u8 pca953x_irq_pending(struct pca953x_chip *chip, u8 *pending)
+{
+ u8 cur_stat[MAX_BANK];
+ u8 old_stat[MAX_BANK];
+ u8 pendings = 0;
+ u8 trigger[MAX_BANK], triggers = 0;
+ int ret, i, offset = 0;
+
+ switch (chip->chip_type) {
+ case PCA953X_TYPE:
+ offset = PCA953X_INPUT;
+ break;
+ case PCA957X_TYPE:
+ offset = PCA957X_IN;
+ break;
+ }
+ ret = pca953x_read_regs(chip, offset, cur_stat);
+ if (ret)
+ return 0;
+
+ /* Remove output pins from the equation */
+ for (i = 0; i < NBANK(chip); i++)
+ cur_stat[i] &= chip->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];
+ triggers += trigger[i];
+ }
+
+ if (!triggers)
+ return 0;
+
+ 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];
+ pendings += pending[i];
+ }
+
+ return pendings;
+}
+
+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.irqdomain,
+ 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,
+ const struct i2c_device_id *id,
+ int irq_base)
+{
+ struct i2c_client *client = chip->client;
+ int ret, i, offset = 0;
+
+ if (client->irq && irq_base != -1
+ && (id->driver_data & PCA_INT)) {
+
+ switch (chip->chip_type) {
+ case PCA953X_TYPE:
+ offset = PCA953X_INPUT;
+ break;
+ case PCA957X_TYPE:
+ offset = PCA957X_IN;
+ break;
+ }
+ ret = pca953x_read_regs(chip, offset, 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.
+ */
+ for (i = 0; i < NBANK(chip); i++)
+ chip->irq_stat[i] &= chip->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;
+ }
+
+ ret = gpiochip_irqchip_add(&chip->gpio_chip,
+ &pca953x_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;
+ }
+ }
+
+ return 0;
+}
+
+#else /* CONFIG_GPIO_PCA953X_IRQ */
+static int pca953x_irq_setup(struct pca953x_chip *chip,
+ const struct i2c_device_id *id,
+ int irq_base)
+{
+ struct i2c_client *client = chip->client;
+
+ if (irq_base != -1 && (id->driver_data & PCA_INT))
+ dev_warn(&client->dev, "interrupt support not compiled in\n");
+
+ return 0;
+}
+#endif
+
+static int device_pca953x_init(struct pca953x_chip *chip, u32 invert)
+{
+ int ret;
+ u8 val[MAX_BANK];
+
+ ret = pca953x_read_regs(chip, PCA953X_OUTPUT, chip->reg_output);
+ if (ret)
+ goto out;
+
+ ret = pca953x_read_regs(chip, PCA953X_DIRECTION,
+ chip->reg_direction);
+ if (ret)
+ 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, PCA953X_INVERT, val);
+out:
+ return ret;
+}
+
+static int device_pca957x_init(struct pca953x_chip *chip, u32 invert)
+{
+ int ret;
+ u8 val[MAX_BANK];
+
+ ret = pca953x_read_regs(chip, PCA957X_OUT, chip->reg_output);
+ if (ret)
+ goto out;
+ ret = pca953x_read_regs(chip, PCA957X_CFG, chip->reg_direction);
+ if (ret)
+ goto out;
+
+ /* set platform specific polarity inversion */
+ if (invert)
+ memset(val, 0xFF, NBANK(chip));
+ else
+ memset(val, 0, NBANK(chip));
+ pca953x_write_regs(chip, PCA957X_INVRT, val);
+
+ /* To enable register 6, 7 to controll pull up and pull down */
+ memset(val, 0x02, NBANK(chip));
+ pca953x_write_regs(chip, PCA957X_BKEN, val);
+
+ return 0;
+out:
+ return ret;
+}
+
+static int pca953x_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ struct pca953x_platform_data *pdata;
+ struct pca953x_chip *chip;
+ int irq_base = 0;
+ int ret;
+ u32 invert = 0;
+
+ 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 {
+ chip->gpio_start = -1;
+ irq_base = 0;
+ }
+
+ chip->client = client;
+
+ chip->chip_type = id->driver_data & (PCA953X_TYPE | PCA957X_TYPE);
+
+ mutex_init(&chip->i2c_lock);
+
+ /* initialize cached registers from their original values.
+ * we can't share this chip with another i2c master.
+ */
+ pca953x_setup_gpio(chip, id->driver_data & PCA_GPIO_MASK);
+
+ if (chip->chip_type == PCA953X_TYPE)
+ ret = device_pca953x_init(chip, invert);
+ else
+ ret = device_pca957x_init(chip, invert);
+ if (ret)
+ return ret;
+
+ ret = gpiochip_add(&chip->gpio_chip);
+ if (ret)
+ return ret;
+
+ ret = pca953x_irq_setup(chip, id, irq_base);
+ if (ret)
+ return ret;
+
+ 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);
+ }
+
+ i2c_set_clientdata(client, chip);
+ return 0;
+}
+
+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 = 0;
+
+ 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);
+ return ret;
+ }
+ }
+
+ gpiochip_remove(&chip->gpio_chip);
+
+ return 0;
+}
+
+static const struct of_device_id pca953x_dt_ids[] = {
+ { .compatible = "nxp,pca9505", },
+ { .compatible = "nxp,pca9534", },
+ { .compatible = "nxp,pca9535", },
+ { .compatible = "nxp,pca9536", },
+ { .compatible = "nxp,pca9537", },
+ { .compatible = "nxp,pca9538", },
+ { .compatible = "nxp,pca9539", },
+ { .compatible = "nxp,pca9554", },
+ { .compatible = "nxp,pca9555", },
+ { .compatible = "nxp,pca9556", },
+ { .compatible = "nxp,pca9557", },
+ { .compatible = "nxp,pca9574", },
+ { .compatible = "nxp,pca9575", },
+ { .compatible = "nxp,pca9698", },
+
+ { .compatible = "maxim,max7310", },
+ { .compatible = "maxim,max7312", },
+ { .compatible = "maxim,max7313", },
+ { .compatible = "maxim,max7315", },
+
+ { .compatible = "ti,pca6107", },
+ { .compatible = "ti,tca6408", },
+ { .compatible = "ti,tca6416", },
+ { .compatible = "ti,tca6424", },
+
+ { .compatible = "exar,xra1202", },
+ { }
+};
+
+MODULE_DEVICE_TABLE(of, pca953x_dt_ids);
+
+static struct i2c_driver pca953x_driver = {
+ .driver = {
+ .name = "pca953x",
+ .of_match_table = pca953x_dt_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");