/* Copyright (c) 2010, Code Aurora Forum. All rights reserved.
+ *
+ * Driver for Semtech SX150X I2C GPIO Expanders
+ *
+ * Author: Gregory Bean <gbean@codeaurora.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 and
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
-#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/slab.h>
-#include <linux/i2c/sx150x.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/of_irq.h>
} pri;
};
+/**
+ * struct sx150x_platform_data - config data for SX150x driver
+ * @gpio_base: The index number of the first GPIO assigned to this
+ * GPIO expander. The expander will create a block of
+ * consecutively numbered gpios beginning at the given base,
+ * with the size of the block depending on the model of the
+ * expander chip.
+ * @oscio_is_gpo: If set to true, the driver will configure OSCIO as a GPO
+ * instead of as an oscillator, increasing the size of the
+ * GP(I)O pool created by this expander by one. The
+ * output-only GPO pin will be added at the end of the block.
+ * @io_pullup_ena: A bit-mask which enables or disables the pull-up resistor
+ * for each IO line in the expander. Setting the bit at
+ * position n will enable the pull-up for the IO at
+ * the corresponding offset. For chips with fewer than
+ * 16 IO pins, high-end bits are ignored.
+ * @io_pulldn_ena: A bit-mask which enables-or disables the pull-down
+ * resistor for each IO line in the expander. Setting the
+ * bit at position n will enable the pull-down for the IO at
+ * the corresponding offset. For chips with fewer than
+ * 16 IO pins, high-end bits are ignored.
+ * @io_polarity: A bit-mask which enables polarity inversion for each IO line
+ * in the expander. Setting the bit at position n inverts
+ * the polarity of that IO line, while clearing it results
+ * in normal polarity. For chips with fewer than 16 IO pins,
+ * high-end bits are ignored.
+ * @irq_summary: The 'summary IRQ' line to which the GPIO expander's INT line
+ * is connected, via which it reports interrupt events
+ * across all GPIO lines. This must be a real,
+ * pre-existing IRQ line.
+ * Setting this value < 0 disables the irq_chip functionality
+ * of the driver.
+ * @irq_base: The first 'virtual IRQ' line at which our block of GPIO-based
+ * IRQ lines will appear. Similarly to gpio_base, the expander
+ * will create a block of irqs beginning at this number.
+ * This value is ignored if irq_summary is < 0.
+ * @reset_during_probe: If set to true, the driver will trigger a full
+ * reset of the chip at the beginning of the probe
+ * in order to place it in a known state.
+ */
+struct sx150x_platform_data {
+ unsigned gpio_base;
+ bool oscio_is_gpo;
+ u16 io_pullup_ena;
+ u16 io_pulldn_ena;
+ u16 io_polarity;
+ int irq_summary;
+ unsigned irq_base;
+ bool reset_during_probe;
+};
+
struct sx150x_chip {
struct gpio_chip gpio_chip;
struct i2c_client *client;
mutex_unlock(&chip->lock);
}
+static int sx150x_gpio_set_single_ended(struct gpio_chip *gc,
+ unsigned offset,
+ enum single_ended_mode mode)
+{
+ struct sx150x_chip *chip = gpiochip_get_data(gc);
+
+ /* On the SX160X 789 we can set open drain */
+ if (chip->dev_cfg->model != SX150X_789)
+ return -ENOTSUPP;
+
+ if (mode == LINE_MODE_PUSH_PULL)
+ return sx150x_write_cfg(chip,
+ offset,
+ 1,
+ chip->dev_cfg->pri.x789.reg_drain,
+ 0);
+
+ if (mode == LINE_MODE_OPEN_DRAIN)
+ return sx150x_write_cfg(chip,
+ offset,
+ 1,
+ chip->dev_cfg->pri.x789.reg_drain,
+ 1);
+ return -ENOTSUPP;
+}
+
static int sx150x_gpio_direction_input(struct gpio_chip *gc, unsigned offset)
{
struct sx150x_chip *chip = gpiochip_get_data(gc);
chip->gpio_chip.direction_output = sx150x_gpio_direction_output;
chip->gpio_chip.get = sx150x_gpio_get;
chip->gpio_chip.set = sx150x_gpio_set;
+ chip->gpio_chip.set_single_ended = sx150x_gpio_set_single_ended;
chip->gpio_chip.base = pdata->gpio_base;
chip->gpio_chip.can_sleep = true;
chip->gpio_chip.ngpio = chip->dev_cfg->ngpios;
return err;
if (chip->dev_cfg->model == SX150X_789) {
- err = sx150x_init_io(chip,
- chip->dev_cfg->pri.x789.reg_drain,
- pdata->io_open_drain_ena);
- if (err < 0)
- return err;
-
err = sx150x_init_io(chip,
chip->dev_cfg->pri.x789.reg_polarity,
pdata->io_polarity);
return i2c_add_driver(&sx150x_driver);
}
subsys_initcall(sx150x_init);
-
-static void __exit sx150x_exit(void)
-{
- return i2c_del_driver(&sx150x_driver);
-}
-module_exit(sx150x_exit);
-
-MODULE_AUTHOR("Gregory Bean <gbean@codeaurora.org>");
-MODULE_DESCRIPTION("Driver for Semtech SX150X I2C GPIO Expanders");
-MODULE_LICENSE("GPL v2");
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