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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,223 @@ | ||
| /* | ||
| * 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 <asm/arch/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 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(void *private_); | ||
|
|
||
| static struct device *akita_ioexp_device; | ||
| static unsigned char ioexp_output_value = AKITA_IOEXP_IO_OUT; | ||
| DECLARE_WORK(akita_ioexp, akita_ioexp_work, NULL); | ||
|
|
||
|
|
||
| /* | ||
| * 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 = { | ||
| .owner = THIS_MODULE, | ||
| .name = "akita-max7310", | ||
| .id = I2C_DRIVERID_AKITAIOEXP, | ||
| .flags = I2C_DF_NOTIFY, | ||
| .attach_adapter = max7310_attach_adapter, | ||
| .detach_client = max7310_detach_client, | ||
| }; | ||
|
|
||
| static struct i2c_client max7310_template = { | ||
| name: "akita-max7310", | ||
| flags: I2C_CLIENT_ALLOW_USE, | ||
| 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(void *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); | ||
|
|
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