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path: root/drivers/gpio/pca953x.c
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Diffstat (limited to 'drivers/gpio/pca953x.c')
-rw-r--r--drivers/gpio/pca953x.c309
1 files changed, 0 insertions, 309 deletions
diff --git a/drivers/gpio/pca953x.c b/drivers/gpio/pca953x.c
deleted file mode 100644
index 6e72fd31184..00000000000
--- a/drivers/gpio/pca953x.c
+++ /dev/null
@@ -1,309 +0,0 @@
-/*
- * pca953x.c - 4/8/16 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/i2c.h>
-#include <linux/i2c/pca953x.h>
-
-#include <asm/gpio.h>
-
-#define PCA953X_INPUT 0
-#define PCA953X_OUTPUT 1
-#define PCA953X_INVERT 2
-#define PCA953X_DIRECTION 3
-
-/* This is temporary - in 2.6.26 i2c_driver_data should replace it. */
-struct pca953x_desc {
- char name[I2C_NAME_SIZE];
- unsigned long driver_data;
-};
-
-static const struct pca953x_desc pca953x_descs[] = {
- { "pca9534", 8, },
- { "pca9535", 16, },
- { "pca9536", 4, },
- { "pca9537", 4, },
- { "pca9538", 8, },
- { "pca9539", 16, },
- /* REVISIT several pca955x parts should work here too */
-};
-
-struct pca953x_chip {
- unsigned gpio_start;
- uint16_t reg_output;
- uint16_t reg_direction;
-
- struct i2c_client *client;
- struct gpio_chip gpio_chip;
-};
-
-/* NOTE: we can't currently rely on fault codes to come from SMBus
- * calls, so we map all errors to EIO here and return zero otherwise.
- */
-static int pca953x_write_reg(struct pca953x_chip *chip, int reg, uint16_t val)
-{
- int ret;
-
- if (chip->gpio_chip.ngpio <= 8)
- ret = i2c_smbus_write_byte_data(chip->client, reg, val);
- else
- ret = i2c_smbus_write_word_data(chip->client, reg << 1, val);
-
- if (ret < 0) {
- dev_err(&chip->client->dev, "failed writing register\n");
- return -EIO;
- }
-
- return 0;
-}
-
-static int pca953x_read_reg(struct pca953x_chip *chip, int reg, uint16_t *val)
-{
- int ret;
-
- if (chip->gpio_chip.ngpio <= 8)
- ret = i2c_smbus_read_byte_data(chip->client, reg);
- else
- ret = i2c_smbus_read_word_data(chip->client, reg << 1);
-
- if (ret < 0) {
- dev_err(&chip->client->dev, "failed reading register\n");
- return -EIO;
- }
-
- *val = (uint16_t)ret;
- return 0;
-}
-
-static int pca953x_gpio_direction_input(struct gpio_chip *gc, unsigned off)
-{
- struct pca953x_chip *chip;
- uint16_t reg_val;
- int ret;
-
- chip = container_of(gc, struct pca953x_chip, gpio_chip);
-
- reg_val = chip->reg_direction | (1u << off);
- ret = pca953x_write_reg(chip, PCA953X_DIRECTION, reg_val);
- if (ret)
- return ret;
-
- chip->reg_direction = reg_val;
- return 0;
-}
-
-static int pca953x_gpio_direction_output(struct gpio_chip *gc,
- unsigned off, int val)
-{
- struct pca953x_chip *chip;
- uint16_t reg_val;
- int ret;
-
- chip = container_of(gc, struct pca953x_chip, gpio_chip);
-
- /* set output level */
- if (val)
- reg_val = chip->reg_output | (1u << off);
- else
- reg_val = chip->reg_output & ~(1u << off);
-
- ret = pca953x_write_reg(chip, PCA953X_OUTPUT, reg_val);
- if (ret)
- return ret;
-
- chip->reg_output = reg_val;
-
- /* then direction */
- reg_val = chip->reg_direction & ~(1u << off);
- ret = pca953x_write_reg(chip, PCA953X_DIRECTION, reg_val);
- if (ret)
- return ret;
-
- chip->reg_direction = reg_val;
- return 0;
-}
-
-static int pca953x_gpio_get_value(struct gpio_chip *gc, unsigned off)
-{
- struct pca953x_chip *chip;
- uint16_t reg_val;
- int ret;
-
- chip = container_of(gc, struct pca953x_chip, gpio_chip);
-
- ret = pca953x_read_reg(chip, PCA953X_INPUT, &reg_val);
- 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)) ? 1 : 0;
-}
-
-static void pca953x_gpio_set_value(struct gpio_chip *gc, unsigned off, int val)
-{
- struct pca953x_chip *chip;
- uint16_t reg_val;
- int ret;
-
- chip = container_of(gc, struct pca953x_chip, gpio_chip);
-
- if (val)
- reg_val = chip->reg_output | (1u << off);
- else
- reg_val = chip->reg_output & ~(1u << off);
-
- ret = pca953x_write_reg(chip, PCA953X_OUTPUT, reg_val);
- if (ret)
- return;
-
- chip->reg_output = reg_val;
-}
-
-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 = 1;
-
- gc->base = chip->gpio_start;
- gc->ngpio = gpios;
- gc->label = chip->client->name;
-}
-
-static int __devinit pca953x_probe(struct i2c_client *client)
-{
- struct pca953x_platform_data *pdata;
- struct pca953x_chip *chip;
- int ret, i;
- const struct pca953x_desc *id = NULL;
-
- pdata = client->dev.platform_data;
- if (pdata == NULL)
- return -ENODEV;
-
- /* this loop vanishes when we get i2c_device_id */
- for (i = 0; i < ARRAY_SIZE(pca953x_descs); i++)
- if (!strcmp(pca953x_descs[i].name, client->name)) {
- id = pca953x_descs + i;
- break;
- }
- if (!id)
- return -ENODEV;
-
- chip = kzalloc(sizeof(struct pca953x_chip), GFP_KERNEL);
- if (chip == NULL)
- return -ENOMEM;
-
- chip->client = client;
-
- chip->gpio_start = pdata->gpio_base;
-
- /* initialize cached registers from their original values.
- * we can't share this chip with another i2c master.
- */
- pca953x_setup_gpio(chip, id->driver_data);
-
- ret = pca953x_read_reg(chip, PCA953X_OUTPUT, &chip->reg_output);
- if (ret)
- goto out_failed;
-
- ret = pca953x_read_reg(chip, PCA953X_DIRECTION, &chip->reg_direction);
- if (ret)
- goto out_failed;
-
- /* set platform specific polarity inversion */
- ret = pca953x_write_reg(chip, PCA953X_INVERT, pdata->invert);
- if (ret)
- goto out_failed;
-
-
- ret = gpiochip_add(&chip->gpio_chip);
- if (ret)
- goto out_failed;
-
- if (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;
-
-out_failed:
- kfree(chip);
- return ret;
-}
-
-static int pca953x_remove(struct i2c_client *client)
-{
- struct pca953x_platform_data *pdata = client->dev.platform_data;
- struct pca953x_chip *chip = i2c_get_clientdata(client);
- int ret = 0;
-
- if (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;
- }
- }
-
- ret = gpiochip_remove(&chip->gpio_chip);
- if (ret) {
- dev_err(&client->dev, "%s failed, %d\n",
- "gpiochip_remove()", ret);
- return ret;
- }
-
- kfree(chip);
- return 0;
-}
-
-static struct i2c_driver pca953x_driver = {
- .driver = {
- .name = "pca953x",
- },
- .probe = pca953x_probe,
- .remove = pca953x_remove,
-};
-
-static int __init pca953x_init(void)
-{
- return i2c_add_driver(&pca953x_driver);
-}
-module_init(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");
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-11-10 02:02:26 +0000