diff options
Diffstat (limited to 'drivers/gpio/mc33880.c')
| -rw-r--r-- | drivers/gpio/mc33880.c | 197 |
1 files changed, 0 insertions, 197 deletions
diff --git a/drivers/gpio/mc33880.c b/drivers/gpio/mc33880.c deleted file mode 100644 index 935479da670..00000000000 --- a/drivers/gpio/mc33880.c +++ /dev/null @@ -1,197 +0,0 @@ -/* - * mc33880.c MC33880 high-side/low-side switch GPIO driver - * Copyright (c) 2009 Intel Corporation - * - * 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. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software - * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. - */ - -/* Supports: - * Freescale MC33880 high-side/low-side switch - */ - -#include <linux/init.h> -#include <linux/mutex.h> -#include <linux/spi/spi.h> -#include <linux/spi/mc33880.h> -#include <linux/gpio.h> -#include <linux/slab.h> - -#define DRIVER_NAME "mc33880" - -/* - * 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 8 - - -/* - * Some registers must be read back to modify. - * To save time we cache them here in memory - */ -struct mc33880 { - struct mutex lock; /* protect from simultanous accesses */ - u8 port_config; - struct gpio_chip chip; - struct spi_device *spi; -}; - -static int mc33880_write_config(struct mc33880 *mc) -{ - return spi_write(mc->spi, &mc->port_config, sizeof(mc->port_config)); -} - - -static int __mc33880_set(struct mc33880 *mc, unsigned offset, int value) -{ - if (value) - mc->port_config |= 1 << offset; - else - mc->port_config &= ~(1 << offset); - - return mc33880_write_config(mc); -} - - -static void mc33880_set(struct gpio_chip *chip, unsigned offset, int value) -{ - struct mc33880 *mc = container_of(chip, struct mc33880, chip); - - mutex_lock(&mc->lock); - - __mc33880_set(mc, offset, value); - - mutex_unlock(&mc->lock); -} - -static int __devinit mc33880_probe(struct spi_device *spi) -{ - struct mc33880 *mc; - struct mc33880_platform_data *pdata; - int ret; - - pdata = spi->dev.platform_data; - if (!pdata || !pdata->base) { - dev_dbg(&spi->dev, "incorrect or missing platform data\n"); - return -EINVAL; - } - - /* - * bits_per_word cannot be configured in platform data - */ - spi->bits_per_word = 8; - - ret = spi_setup(spi); - if (ret < 0) - return ret; - - mc = kzalloc(sizeof(struct mc33880), GFP_KERNEL); - if (!mc) - return -ENOMEM; - - mutex_init(&mc->lock); - - dev_set_drvdata(&spi->dev, mc); - - mc->spi = spi; - - mc->chip.label = DRIVER_NAME, - mc->chip.set = mc33880_set; - mc->chip.base = pdata->base; - mc->chip.ngpio = PIN_NUMBER; - mc->chip.can_sleep = 1; - mc->chip.dev = &spi->dev; - mc->chip.owner = THIS_MODULE; - - mc->port_config = 0x00; - /* write twice, because during initialisation the first setting - * is just for testing SPI communication, and the second is the - * "real" configuration - */ - ret = mc33880_write_config(mc); - mc->port_config = 0x00; - if (!ret) - ret = mc33880_write_config(mc); - - if (ret) { - printk(KERN_ERR "Failed writing to " DRIVER_NAME ": %d\n", ret); - goto exit_destroy; - } - - ret = gpiochip_add(&mc->chip); - if (ret) - goto exit_destroy; - - return ret; - -exit_destroy: - dev_set_drvdata(&spi->dev, NULL); - mutex_destroy(&mc->lock); - kfree(mc); - return ret; -} - -static int mc33880_remove(struct spi_device *spi) -{ - struct mc33880 *mc; - int ret; - - mc = dev_get_drvdata(&spi->dev); - if (mc == NULL) - return -ENODEV; - - dev_set_drvdata(&spi->dev, NULL); - - ret = gpiochip_remove(&mc->chip); - if (!ret) { - mutex_destroy(&mc->lock); - kfree(mc); - } else - dev_err(&spi->dev, "Failed to remove the GPIO controller: %d\n", - ret); - - return ret; -} - -static struct spi_driver mc33880_driver = { - .driver = { - .name = DRIVER_NAME, - .owner = THIS_MODULE, - }, - .probe = mc33880_probe, - .remove = __devexit_p(mc33880_remove), -}; - -static int __init mc33880_init(void) -{ - return spi_register_driver(&mc33880_driver); -} -/* register after spi postcore initcall and before - * subsys initcalls that may rely on these GPIOs - */ -subsys_initcall(mc33880_init); - -static void __exit mc33880_exit(void) -{ - spi_unregister_driver(&mc33880_driver); -} -module_exit(mc33880_exit); - -MODULE_AUTHOR("Mocean Laboratories <info@mocean-labs.com>"); -MODULE_LICENSE("GPL v2"); - |