diff options
Diffstat (limited to 'arch/arm/mach-pxa/akita-ioexp.c')
| -rw-r--r-- | arch/arm/mach-pxa/akita-ioexp.c | 222 |
1 files changed, 0 insertions, 222 deletions
diff --git a/arch/arm/mach-pxa/akita-ioexp.c b/arch/arm/mach-pxa/akita-ioexp.c deleted file mode 100644 index 5c67b18..0000000 --- a/arch/arm/mach-pxa/akita-ioexp.c +++ /dev/null @@ -1,222 +0,0 @@ -/* - * Support for the Extra GPIOs on the Sharp SL-C1000 (Akita) - * (uses a Maxim MAX7310 8 Port IO Expander) - * - * Copyright 2005 Openedhand Ltd. - * - * Author: Richard Purdie <richard@openedhand.com> - * - * 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. - * - */ - -#include <linux/kernel.h> -#include <linux/init.h> -#include <linux/platform_device.h> -#include <linux/module.h> -#include <linux/i2c.h> -#include <linux/slab.h> -#include <linux/workqueue.h> -#include <mach/akita.h> - -/* MAX7310 Regiser Map */ -#define MAX7310_INPUT 0x00 -#define MAX7310_OUTPUT 0x01 -#define MAX7310_POLINV 0x02 -#define MAX7310_IODIR 0x03 /* 1 = Input, 0 = Output */ -#define MAX7310_TIMEOUT 0x04 - -/* Addresses to scan */ -static const unsigned short normal_i2c[] = { 0x18, I2C_CLIENT_END }; - -/* I2C Magic */ -I2C_CLIENT_INSMOD; - -static int max7310_write(struct i2c_client *client, int address, int data); -static struct i2c_client max7310_template; -static void akita_ioexp_work(struct work_struct *private_); - -static struct device *akita_ioexp_device; -static unsigned char ioexp_output_value = AKITA_IOEXP_IO_OUT; -DECLARE_WORK(akita_ioexp, akita_ioexp_work); - - -/* - * MAX7310 Access - */ -static int max7310_config(struct device *dev, int iomode, int polarity) -{ - int ret; - struct i2c_client *client = to_i2c_client(dev); - - ret = max7310_write(client, MAX7310_POLINV, polarity); - if (ret < 0) - return ret; - ret = max7310_write(client, MAX7310_IODIR, iomode); - return ret; -} - -static int max7310_set_ouputs(struct device *dev, int outputs) -{ - struct i2c_client *client = to_i2c_client(dev); - - return max7310_write(client, MAX7310_OUTPUT, outputs); -} - -/* - * I2C Functions - */ -static int max7310_write(struct i2c_client *client, int address, int value) -{ - u8 data[2]; - - data[0] = address & 0xff; - data[1] = value & 0xff; - - if (i2c_master_send(client, data, 2) == 2) - return 0; - return -1; -} - -static int max7310_detect(struct i2c_adapter *adapter, int address, int kind) -{ - struct i2c_client *new_client; - int err; - - if (!(new_client = kmalloc(sizeof(struct i2c_client), GFP_KERNEL))) - return -ENOMEM; - - max7310_template.adapter = adapter; - max7310_template.addr = address; - - memcpy(new_client, &max7310_template, sizeof(struct i2c_client)); - - if ((err = i2c_attach_client(new_client))) { - kfree(new_client); - return err; - } - - max7310_config(&new_client->dev, AKITA_IOEXP_IO_DIR, 0); - akita_ioexp_device = &new_client->dev; - schedule_work(&akita_ioexp); - - return 0; -} - -static int max7310_attach_adapter(struct i2c_adapter *adapter) -{ - return i2c_probe(adapter, &addr_data, max7310_detect); -} - -static int max7310_detach_client(struct i2c_client *client) -{ - int err; - - akita_ioexp_device = NULL; - - if ((err = i2c_detach_client(client))) - return err; - - kfree(client); - return 0; -} - -static struct i2c_driver max7310_i2c_driver = { - .driver = { - .name = "akita-max7310", - }, - .id = I2C_DRIVERID_AKITAIOEXP, - .attach_adapter = max7310_attach_adapter, - .detach_client = max7310_detach_client, -}; - -static struct i2c_client max7310_template = { - name: "akita-max7310", - driver: &max7310_i2c_driver, -}; - -void akita_set_ioexp(struct device *dev, unsigned char bit) -{ - ioexp_output_value |= bit; - - if (akita_ioexp_device) - schedule_work(&akita_ioexp); - return; -} - -void akita_reset_ioexp(struct device *dev, unsigned char bit) -{ - ioexp_output_value &= ~bit; - - if (akita_ioexp_device) - schedule_work(&akita_ioexp); - return; -} - -EXPORT_SYMBOL(akita_set_ioexp); -EXPORT_SYMBOL(akita_reset_ioexp); - -static void akita_ioexp_work(struct work_struct *private_) -{ - if (akita_ioexp_device) - max7310_set_ouputs(akita_ioexp_device, ioexp_output_value); -} - - -#ifdef CONFIG_PM -static int akita_ioexp_suspend(struct platform_device *pdev, pm_message_t state) -{ - flush_scheduled_work(); - return 0; -} - -static int akita_ioexp_resume(struct platform_device *pdev) -{ - schedule_work(&akita_ioexp); - return 0; -} -#else -#define akita_ioexp_suspend NULL -#define akita_ioexp_resume NULL -#endif - -static int __init akita_ioexp_probe(struct platform_device *pdev) -{ - return i2c_add_driver(&max7310_i2c_driver); -} - -static int akita_ioexp_remove(struct platform_device *pdev) -{ - i2c_del_driver(&max7310_i2c_driver); - return 0; -} - -static struct platform_driver akita_ioexp_driver = { - .probe = akita_ioexp_probe, - .remove = akita_ioexp_remove, - .suspend = akita_ioexp_suspend, - .resume = akita_ioexp_resume, - .driver = { - .name = "akita-ioexp", - }, -}; - -static int __init akita_ioexp_init(void) -{ - return platform_driver_register(&akita_ioexp_driver); -} - -static void __exit akita_ioexp_exit(void) -{ - platform_driver_unregister(&akita_ioexp_driver); -} - -MODULE_AUTHOR("Richard Purdie <rpurdie@openedhand.com>"); -MODULE_DESCRIPTION("Akita IO-Expander driver"); -MODULE_LICENSE("GPL"); - -fs_initcall(akita_ioexp_init); -module_exit(akita_ioexp_exit); - |
