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Diffstat (limited to 'drivers/gpio/max730x.c')
-rw-r--r--drivers/gpio/max730x.c257
1 files changed, 0 insertions, 257 deletions
diff --git a/drivers/gpio/max730x.c b/drivers/gpio/max730x.c
deleted file mode 100644
index 94ce773f95f8..000000000000
--- a/drivers/gpio/max730x.c
+++ /dev/null
@@ -1,257 +0,0 @@
-/**
- * drivers/gpio/max7301.c
- *
- * Copyright (C) 2006 Juergen Beisert, Pengutronix
- * Copyright (C) 2008 Guennadi Liakhovetski, Pengutronix
- * Copyright (C) 2009 Wolfram Sang, Pengutronix
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- *
- * The Maxim MAX7300/1 device is an I2C/SPI driven GPIO expander. There are
- * 28 GPIOs. 8 of them can trigger an interrupt. See datasheet for more
- * details
- * Note:
- * - DIN must be stable at the rising edge of clock.
- * - when writing:
- * - always clock in 16 clocks at once
- * - at DIN: D15 first, D0 last
- * - D0..D7 = databyte, D8..D14 = commandbyte
- * - D15 = low -> write command
- * - when reading
- * - always clock in 16 clocks at once
- * - at DIN: D15 first, D0 last
- * - D0..D7 = dummy, D8..D14 = register address
- * - D15 = high -> read command
- * - raise CS and assert it again
- * - always clock in 16 clocks at once
- * - at DOUT: D15 first, D0 last
- * - D0..D7 contains the data from the first cycle
- *
- * The driver exports a standard gpiochip interface
- */
-
-#include <linux/module.h>
-#include <linux/init.h>
-#include <linux/platform_device.h>
-#include <linux/mutex.h>
-#include <linux/spi/max7301.h>
-#include <linux/gpio.h>
-#include <linux/slab.h>
-
-/*
- * Pin configurations, see MAX7301 datasheet page 6
- */
-#define PIN_CONFIG_MASK 0x03
-#define PIN_CONFIG_IN_PULLUP 0x03
-#define PIN_CONFIG_IN_WO_PULLUP 0x02
-#define PIN_CONFIG_OUT 0x01
-
-#define PIN_NUMBER 28
-
-static int max7301_direction_input(struct gpio_chip *chip, unsigned offset)
-{
- struct max7301 *ts = container_of(chip, struct max7301, chip);
- u8 *config;
- u8 offset_bits, pin_config;
- int ret;
-
- /* First 4 pins are unused in the controller */
- offset += 4;
- offset_bits = (offset & 3) << 1;
-
- config = &ts->port_config[offset >> 2];
-
- if (ts->input_pullup_active & BIT(offset))
- pin_config = PIN_CONFIG_IN_PULLUP;
- else
- pin_config = PIN_CONFIG_IN_WO_PULLUP;
-
- mutex_lock(&ts->lock);
-
- *config = (*config & ~(PIN_CONFIG_MASK << offset_bits))
- | (pin_config << offset_bits);
-
- ret = ts->write(ts->dev, 0x08 + (offset >> 2), *config);
-
- mutex_unlock(&ts->lock);
-
- return ret;
-}
-
-static int __max7301_set(struct max7301 *ts, unsigned offset, int value)
-{
- if (value) {
- ts->out_level |= 1 << offset;
- return ts->write(ts->dev, 0x20 + offset, 0x01);
- } else {
- ts->out_level &= ~(1 << offset);
- return ts->write(ts->dev, 0x20 + offset, 0x00);
- }
-}
-
-static int max7301_direction_output(struct gpio_chip *chip, unsigned offset,
- int value)
-{
- struct max7301 *ts = container_of(chip, struct max7301, chip);
- u8 *config;
- u8 offset_bits;
- int ret;
-
- /* First 4 pins are unused in the controller */
- offset += 4;
- offset_bits = (offset & 3) << 1;
-
- config = &ts->port_config[offset >> 2];
-
- mutex_lock(&ts->lock);
-
- *config = (*config & ~(PIN_CONFIG_MASK << offset_bits))
- | (PIN_CONFIG_OUT << offset_bits);
-
- ret = __max7301_set(ts, offset, value);
-
- if (!ret)
- ret = ts->write(ts->dev, 0x08 + (offset >> 2), *config);
-
- mutex_unlock(&ts->lock);
-
- return ret;
-}
-
-static int max7301_get(struct gpio_chip *chip, unsigned offset)
-{
- struct max7301 *ts = container_of(chip, struct max7301, chip);
- int config, level = -EINVAL;
-
- /* First 4 pins are unused in the controller */
- offset += 4;
-
- mutex_lock(&ts->lock);
-
- config = (ts->port_config[offset >> 2] >> ((offset & 3) << 1))
- & PIN_CONFIG_MASK;
-
- switch (config) {
- case PIN_CONFIG_OUT:
- /* Output: return cached level */
- level = !!(ts->out_level & (1 << offset));
- break;
- case PIN_CONFIG_IN_WO_PULLUP:
- case PIN_CONFIG_IN_PULLUP:
- /* Input: read out */
- level = ts->read(ts->dev, 0x20 + offset) & 0x01;
- }
- mutex_unlock(&ts->lock);
-
- return level;
-}
-
-static void max7301_set(struct gpio_chip *chip, unsigned offset, int value)
-{
- struct max7301 *ts = container_of(chip, struct max7301, chip);
-
- /* First 4 pins are unused in the controller */
- offset += 4;
-
- mutex_lock(&ts->lock);
-
- __max7301_set(ts, offset, value);
-
- mutex_unlock(&ts->lock);
-}
-
-int __devinit __max730x_probe(struct max7301 *ts)
-{
- struct device *dev = ts->dev;
- struct max7301_platform_data *pdata;
- int i, ret;
-
- pdata = dev->platform_data;
- if (!pdata || !pdata->base) {
- dev_err(dev, "incorrect or missing platform data\n");
- return -EINVAL;
- }
-
- mutex_init(&ts->lock);
- dev_set_drvdata(dev, ts);
-
- /* Power up the chip and disable IRQ output */
- ts->write(dev, 0x04, 0x01);
-
- ts->input_pullup_active = pdata->input_pullup_active;
- ts->chip.label = dev->driver->name;
-
- ts->chip.direction_input = max7301_direction_input;
- ts->chip.get = max7301_get;
- ts->chip.direction_output = max7301_direction_output;
- ts->chip.set = max7301_set;
-
- ts->chip.base = pdata->base;
- ts->chip.ngpio = PIN_NUMBER;
- ts->chip.can_sleep = 1;
- ts->chip.dev = dev;
- ts->chip.owner = THIS_MODULE;
-
- /*
- * initialize pullups according to platform data and cache the
- * register values for later use.
- */
- for (i = 1; i < 8; i++) {
- int j;
- /*
- * initialize port_config with "0xAA", which means
- * input with internal pullup disabled. This is needed
- * to avoid writing zeros (in the inner for loop),
- * which is not allowed according to the datasheet.
- */
- ts->port_config[i] = 0xAA;
- for (j = 0; j < 4; j++) {
- int offset = (i - 1) * 4 + j;
- ret = max7301_direction_input(&ts->chip, offset);
- if (ret)
- goto exit_destroy;
- }
- }
-
- ret = gpiochip_add(&ts->chip);
- if (ret)
- goto exit_destroy;
-
- return ret;
-
-exit_destroy:
- dev_set_drvdata(dev, NULL);
- mutex_destroy(&ts->lock);
- return ret;
-}
-EXPORT_SYMBOL_GPL(__max730x_probe);
-
-int __devexit __max730x_remove(struct device *dev)
-{
- struct max7301 *ts = dev_get_drvdata(dev);
- int ret;
-
- if (ts == NULL)
- return -ENODEV;
-
- dev_set_drvdata(dev, NULL);
-
- /* Power down the chip and disable IRQ output */
- ts->write(dev, 0x04, 0x00);
-
- ret = gpiochip_remove(&ts->chip);
- if (!ret) {
- mutex_destroy(&ts->lock);
- kfree(ts);
- } else
- dev_err(dev, "Failed to remove GPIO controller: %d\n", ret);
-
- return ret;
-}
-EXPORT_SYMBOL_GPL(__max730x_remove);
-
-MODULE_AUTHOR("Juergen Beisert, Wolfram Sang");
-MODULE_LICENSE("GPL v2");
-MODULE_DESCRIPTION("MAX730x GPIO-Expanders, generic parts");
generated by cgit v1.2.3 (git 2.0.4) at 2024-11-06 16:05:02 +0000