gpio: gpio driver for max7301 SPI GPIO expander

Maxim's MAX7301 is an SPI GPIO expander with 28 GPIOs.  Note: MAX7301's
interrupt feature is not supported yet.

[akpm@linux-foundation.org: coding-style fixes]
[g.liakhovetski@pengutronix.de: Fix inaccuracies in comments, check spi_setup()
return code, mask off high byte in max7301_read()]
Signed-off-by: Juergen Beisert <j.beisert@pengutronix.de>
Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@pengutronix.de>
Cc: Russell King <rmk@arm.linux.org.uk>
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

3 files changed, 346 insertions, 0 deletions

diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index 008c38ba774f..9e0c4fbfc51a 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -69,6 +69,12 @@ config GPIO_PCF857X
 
 comment "SPI GPIO expanders:"
 
+config GPIO_MAX7301
+        tristate "Maxim MAX7301 GPIO expander"
+        depends on SPI_MASTER
+        help
+          gpio driver for Maxim MAX7301 SPI GPIO expander.
+
 config GPIO_MCP23S08
         tristate "Microchip MCP23S08 I/O expander"
         depends on SPI_MASTER
diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile
index fdde9923cf33..16e796dc5410 100644
--- a/drivers/gpio/Makefile
+++ b/drivers/gpio/Makefile
@@ -4,6 +4,7 @@ ccflags-$(CONFIG_DEBUG_GPIO)	+= -DDEBUG
 
 obj-$(CONFIG_HAVE_GPIO_LIB)     += gpiolib.o
 
+obj-$(CONFIG_GPIO_MAX7301)      += max7301.o
 obj-$(CONFIG_GPIO_MCP23S08)     += mcp23s08.o
 obj-$(CONFIG_GPIO_PCA953X)      += pca953x.o
 obj-$(CONFIG_GPIO_PCF857X)      += pcf857x.o
diff --git a/drivers/gpio/max7301.c b/drivers/gpio/max7301.c
new file mode 100644
index 000000000000..39c795ad8312
--- /dev/null
+++ b/drivers/gpio/max7301.c
@@ -0,0 +1,339 @@
+/**
+ * drivers/gpio/max7301.c
+ *
+ * Copyright (C) 2006 Juergen Beisert, Pengutronix
+ * Copyright (C) 2008 Guennadi Liakhovetski, 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's MAX7301 device is an 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/init.h>
+#include <linux/platform_device.h>
+#include <linux/mutex.h>
+#include <linux/spi/spi.h>
+#include <linux/spi/max7301.h>
+#include <linux/gpio.h>
+
+#define DRIVER_NAME "max7301"
+
+/*
+ * 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
+
+
+/*
+ * Some registers must be read back to modify.
+ * To save time we cache them here in memory
+ */
+struct max7301 {
+        struct mutex    lock;
+        u8              port_config[8]; /* field 0 is unused */
+        u32             out_level;      /* cached output levels */
+        struct gpio_chip chip;
+        struct spi_device *spi;
+};
+
+/**
+ * max7301_write - Write a new register content
+ * @spi: The SPI device
+ * @reg: Register offset
+ * @val: Value to write
+ *
+ * A write to the MAX7301 means one message with one transfer
+ *
+ * Returns 0 if successful or a negative value on error
+ */
+static int max7301_write(struct spi_device *spi, unsigned int reg, unsigned int val)
+{
+        u16 word = ((reg & 0x7F) << 8) | (val & 0xFF);
+        return spi_write(spi, (const u8 *)&word, sizeof(word));
+}
+
+/**
+ * max7301_read - Read back register content
+ * @spi: The SPI device
+ * @reg: Register offset
+ *
+ * A read from the MAX7301 means two transfers; here, one message each
+ *
+ * Returns positive 8 bit value from device if successful or a
+ * negative value on error
+ */
+static int max7301_read(struct spi_device *spi, unsigned int reg)
+{
+        int ret;
+        u16 word;
+
+        word = 0x8000 | (reg << 8);
+        ret = spi_write(spi, (const u8 *)&word, sizeof(word));
+        if (ret)
+                return ret;
+        /*
+         * This relies on the fact, that a transfer with NULL tx_buf shifts out
+         * zero bytes (=NOOP for MAX7301)
+         */
+        ret = spi_read(spi, (u8 *)&word, sizeof(word));
+        if (ret)
+                return ret;
+        return word & 0xff;
+}
+
+static int max7301_direction_input(struct gpio_chip *chip, unsigned offset)
+{
+        struct max7301 *ts = container_of(chip, struct max7301, chip);
+        u8 *config;
+        int ret;
+
+        /* First 4 pins are unused in the controller */
+        offset += 4;
+
+        config = &ts->port_config[offset >> 2];
+
+        mutex_lock(&ts->lock);
+
+        /* Standard GPIO API doesn't support pull-ups, has to be extended.
+         * Hard-coding no pollup for now. */
+        *config = (*config & ~(3 << (offset & 3))) | (1 << (offset & 3));
+
+        ret = max7301_write(ts->spi, 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 max7301_write(ts->spi, 0x20 + offset, 0x01);
+        } else {
+                ts->out_level &= ~(1 << offset);
+                return max7301_write(ts->spi, 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;
+        int ret;
+
+        /* First 4 pins are unused in the controller */
+        offset += 4;
+
+        config = &ts->port_config[offset >> 2];
+
+        mutex_lock(&ts->lock);
+
+        *config = (*config & ~(3 << (offset & 3))) | (1 << (offset & 3));
+
+        ret = __max7301_set(ts, offset, value);
+
+        if (!ret)
+                ret = max7301_write(ts->spi, 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) * 2)) & 3;
+
+        switch (config) {
+        case 1:
+                /* Output: return cached level */
+                level =  !!(ts->out_level & (1 << offset));
+                break;
+        case 2:
+        case 3:
+                /* Input: read out */
+                level = max7301_read(ts->spi, 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);
+}
+
+static int __devinit max7301_probe(struct spi_device *spi)
+{
+        struct max7301 *ts;
+        struct max7301_platform_data *pdata;
+        int i, ret;
+
+        pdata = spi->dev.platform_data;
+        if (!pdata || !pdata->base)
+                return -ENODEV;
+
+        /*
+         * bits_per_word cannot be configured in platform data
+         */
+        spi->bits_per_word = 16;
+
+        ret = spi_setup(spi);
+        if (ret < 0)
+                return ret;
+
+        ts = kzalloc(sizeof(struct max7301), GFP_KERNEL);
+        if (!ts)
+                return -ENOMEM;
+
+        mutex_init(&ts->lock);
+
+        dev_set_drvdata(&spi->dev, ts);
+
+        /* Power up the chip and disable IRQ output */
+        max7301_write(spi, 0x04, 0x01);
+
+        ts->spi = spi;
+
+        ts->chip.label = 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 = &spi->dev;
+        ts->chip.owner = THIS_MODULE;
+
+        ret = gpiochip_add(&ts->chip);
+        if (ret)
+                goto exit_destroy;
+
+        /*
+         * tristate all pins in hardware and cache the
+         * register values for later use.
+         */
+        for (i = 1; i < 8; i++) {
+                int j;
+                /* 0xAA means input with internal pullup disabled */
+                max7301_write(spi, 0x08 + i, 0xAA);
+                ts->port_config[i] = 0xAA;
+                for (j = 0; j < 4; j++) {
+                        int idx = ts->chip.base + (i - 1) * 4 + j;
+                        ret = gpio_direction_input(idx);
+                        if (ret)
+                                goto exit_remove;
+                        gpio_free(idx);
+                }
+        }
+        return ret;
+
+exit_remove:
+        gpiochip_remove(&ts->chip);
+exit_destroy:
+        dev_set_drvdata(&spi->dev, NULL);
+        mutex_destroy(&ts->lock);
+        kfree(ts);
+        return ret;
+}
+
+static int max7301_remove(struct spi_device *spi)
+{
+        struct max7301 *ts;
+        int ret;
+
+        ts = dev_get_drvdata(&spi->dev);
+        if (ts == NULL)
+                return -ENODEV;
+
+        dev_set_drvdata(&spi->dev, NULL);
+
+        /* Power down the chip and disable IRQ output */
+        max7301_write(spi, 0x04, 0x00);
+
+        ret = gpiochip_remove(&ts->chip);
+        if (!ret) {
+                mutex_destroy(&ts->lock);
+                kfree(ts);
+        } else
+                dev_err(&spi->dev, "Failed to remove the GPIO controller: %d\n",
+                        ret);
+
+        return ret;
+}
+
+static struct spi_driver max7301_driver = {
+        .driver = {
+                .name           = DRIVER_NAME,
+                .owner          = THIS_MODULE,
+        },
+        .probe          = max7301_probe,
+        .remove         = __devexit_p(max7301_remove),
+};
+
+static int __init max7301_init(void)
+{
+        return spi_register_driver(&max7301_driver);
+}
+
+static void __exit max7301_exit(void)
+{
+        spi_unregister_driver(&max7301_driver);
+}
+
+module_init(max7301_init);
+module_exit(max7301_exit);
+
+MODULE_AUTHOR("Juergen Beisert");
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("MAX7301 SPI based GPIO-Expander");