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authorAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
committerAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
commit57f0f512b273f60d52568b8c6b77e17f5636edc0 (patch)
tree5e910f0e82173f4ef4f51111366a3f1299037a7b /drivers/gpio/gpio-max730x.c
Initial import
Diffstat (limited to 'drivers/gpio/gpio-max730x.c')
-rw-r--r--drivers/gpio/gpio-max730x.c246
1 files changed, 246 insertions, 0 deletions
diff --git a/drivers/gpio/gpio-max730x.c b/drivers/gpio/gpio-max730x.c
new file mode 100644
index 000000000..18ab89e20
--- /dev/null
+++ b/drivers/gpio/gpio-max730x.c
@@ -0,0 +1,246 @@
+/**
+ * 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 __max730x_probe(struct max7301 *ts)
+{
+ struct device *dev = ts->dev;
+ struct max7301_platform_data *pdata;
+ int i, ret;
+
+ pdata = dev_get_platdata(dev);
+
+ mutex_init(&ts->lock);
+ dev_set_drvdata(dev, ts);
+
+ /* Power up the chip and disable IRQ output */
+ ts->write(dev, 0x04, 0x01);
+
+ if (pdata) {
+ ts->input_pullup_active = pdata->input_pullup_active;
+ ts->chip.base = pdata->base;
+ } else {
+ ts->chip.base = -1;
+ }
+ 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.ngpio = PIN_NUMBER;
+ ts->chip.can_sleep = true;
+ 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:
+ mutex_destroy(&ts->lock);
+ return ret;
+}
+EXPORT_SYMBOL_GPL(__max730x_probe);
+
+int __max730x_remove(struct device *dev)
+{
+ struct max7301 *ts = dev_get_drvdata(dev);
+
+ if (ts == NULL)
+ return -ENODEV;
+
+ /* Power down the chip and disable IRQ output */
+ ts->write(dev, 0x04, 0x00);
+ gpiochip_remove(&ts->chip);
+ mutex_destroy(&ts->lock);
+ kfree(ts);
+ return 0;
+}
+EXPORT_SYMBOL_GPL(__max730x_remove);
+
+MODULE_AUTHOR("Juergen Beisert, Wolfram Sang");
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("MAX730x GPIO-Expanders, generic parts");