/*
- * pca953x.c - 16-bit I/O port with interrupt and reset
+ * pca953x.c - 4/8/16 bit I/O ports
*
* Copyright (C) 2005 Ben Gardner <bgardner@wabtec.com>
* Copyright (C) 2007 Marvell International Ltd.
#include <linux/module.h>
#include <linux/init.h>
+#include <linux/gpio.h>
#include <linux/i2c.h>
#include <linux/i2c/pca953x.h>
-
-#include <asm/gpio.h>
-
-
-#define NR_PCA953X_GPIOS 16
-
-#define PCA953X_INPUT 0
-#define PCA953X_OUTPUT 2
-#define PCA953X_INVERT 4
-#define PCA953X_DIRECTION 6
+#ifdef CONFIG_OF_GPIO
+#include <linux/of_platform.h>
+#include <linux/of_gpio.h>
+#endif
+
+#define PCA953X_INPUT 0
+#define PCA953X_OUTPUT 1
+#define PCA953X_INVERT 2
+#define PCA953X_DIRECTION 3
+
+static const struct i2c_device_id pca953x_id[] = {
+ { "pca9534", 8, },
+ { "pca9535", 16, },
+ { "pca9536", 4, },
+ { "pca9537", 4, },
+ { "pca9538", 8, },
+ { "pca9539", 16, },
+ { "pca9554", 8, },
+ { "pca9555", 16, },
+ { "pca9556", 8, },
+ { "pca9557", 8, },
+
+ { "max7310", 8, },
+ { "max7315", 8, },
+ { "pca6107", 8, },
+ { "tca6408", 8, },
+ { "tca6416", 16, },
+ /* NYET: { "tca6424", 24, }, */
+ { }
+};
+MODULE_DEVICE_TABLE(i2c, pca953x_id);
struct pca953x_chip {
unsigned gpio_start;
uint16_t reg_direction;
struct i2c_client *client;
+ struct pca953x_platform_data *dyn_pdata;
struct gpio_chip gpio_chip;
+ char **names;
};
-/* 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)
{
- if (i2c_smbus_write_word_data(chip->client, reg, val) < 0)
- return -EIO;
+ int ret;
+
+ if (chip->gpio_chip.ngpio <= 8)
+ ret = i2c_smbus_write_byte_data(chip->client, reg, val);
else
- return 0;
+ ret = i2c_smbus_write_word_data(chip->client, reg << 1, val);
+
+ if (ret < 0) {
+ dev_err(&chip->client->dev, "failed writing register\n");
+ return ret;
+ }
+
+ return 0;
}
static int pca953x_read_reg(struct pca953x_chip *chip, int reg, uint16_t *val)
{
int ret;
- ret = i2c_smbus_read_word_data(chip->client, reg);
+ 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;
+ return ret;
}
*val = (uint16_t)ret;
chip->reg_output = reg_val;
}
-static int pca953x_init_gpio(struct pca953x_chip *chip)
+static void pca953x_setup_gpio(struct pca953x_chip *chip, int gpios)
{
struct gpio_chip *gc;
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 = NR_PCA953X_GPIOS;
- gc->label = "pca953x";
+ gc->ngpio = gpios;
+ gc->label = chip->client->name;
+ gc->dev = &chip->client->dev;
+ gc->owner = THIS_MODULE;
+ gc->names = chip->names;
+}
+
+/*
+ * Handlers for alternative sources of platform_data
+ */
+#ifdef CONFIG_OF_GPIO
+/*
+ * Translate OpenFirmware node properties into platform_data
+ */
+static struct pca953x_platform_data *
+pca953x_get_alt_pdata(struct i2c_client *client)
+{
+ struct pca953x_platform_data *pdata;
+ struct device_node *node;
+ const uint16_t *val;
+
+ node = dev_archdata_get_node(&client->dev.archdata);
+ if (node == NULL)
+ return NULL;
+
+ pdata = kzalloc(sizeof(struct pca953x_platform_data), GFP_KERNEL);
+ if (pdata == NULL) {
+ dev_err(&client->dev, "Unable to allocate platform_data\n");
+ return NULL;
+ }
+
+ pdata->gpio_base = -1;
+ val = of_get_property(node, "linux,gpio-base", NULL);
+ if (val) {
+ if (*val < 0)
+ dev_warn(&client->dev,
+ "invalid gpio-base in device tree\n");
+ else
+ pdata->gpio_base = *val;
+ }
+
+ val = of_get_property(node, "polarity", NULL);
+ if (val)
+ pdata->invert = *val;
- return gpiochip_add(gc);
+ return pdata;
}
+#else
+static struct pca953x_platform_data *
+pca953x_get_alt_pdata(struct i2c_client *client)
+{
+ return NULL;
+}
+#endif
-static int __devinit pca953x_probe(struct i2c_client *client)
+static int __devinit pca953x_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
{
struct pca953x_platform_data *pdata;
struct pca953x_chip *chip;
int ret;
- pdata = client->dev.platform_data;
- if (pdata == NULL)
- return -ENODEV;
-
chip = kzalloc(sizeof(struct pca953x_chip), GFP_KERNEL);
if (chip == NULL)
return -ENOMEM;
+ pdata = client->dev.platform_data;
+ if (pdata == NULL) {
+ pdata = pca953x_get_alt_pdata(client);
+ /*
+ * Unlike normal platform_data, this is allocated
+ * dynamically and must be freed in the driver
+ */
+ chip->dyn_pdata = pdata;
+ }
+
+ if (pdata == NULL) {
+ dev_dbg(&client->dev, "no platform data\n");
+ ret = -EINVAL;
+ goto out_failed;
+ }
+
chip->client = client;
chip->gpio_start = pdata->gpio_base;
+ chip->names = pdata->names;
+
/* 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;
if (ret)
goto out_failed;
- ret = pca953x_init_gpio(chip);
+
+ ret = gpiochip_add(&chip->gpio_chip);
if (ret)
goto out_failed;
return 0;
out_failed:
+ kfree(chip->dyn_pdata);
kfree(chip);
return ret;
}
return ret;
}
+ kfree(chip->dyn_pdata);
kfree(chip);
return 0;
}
},
.probe = pca953x_probe,
.remove = pca953x_remove,
+ .id_table = pca953x_id,
};
static int __init pca953x_init(void)
{
return i2c_add_driver(&pca953x_driver);
}
-module_init(pca953x_init);
+/* 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)
{
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff