1 /* 2 * Copyright (C) 2009 Wolfram Sang, Pengutronix 3 * 4 * This program is free software; you can redistribute it and/or modify 5 * it under the terms of the GNU General Public License version 2 as 6 * published by the Free Software Foundation. 7 * 8 * Check max730x.c for further details. 9 */ 10 11 #include <linux/module.h> 12 #include <linux/init.h> 13 #include <linux/platform_device.h> 14 #include <linux/mutex.h> 15 #include <linux/i2c.h> 16 #include <linux/spi/max7301.h> 17 #include <linux/slab.h> 18 19 static int max7300_i2c_write(struct device *dev, unsigned int reg, 20 unsigned int val) 21 { 22 struct i2c_client *client = to_i2c_client(dev); 23 24 return i2c_smbus_write_byte_data(client, reg, val); 25 } 26 27 static int max7300_i2c_read(struct device *dev, unsigned int reg) 28 { 29 struct i2c_client *client = to_i2c_client(dev); 30 31 return i2c_smbus_read_byte_data(client, reg); 32 } 33 34 static int max7300_probe(struct i2c_client *client, 35 const struct i2c_device_id *id) 36 { 37 struct max7301 *ts; 38 39 if (!i2c_check_functionality(client->adapter, 40 I2C_FUNC_SMBUS_BYTE_DATA)) 41 return -EIO; 42 43 ts = devm_kzalloc(&client->dev, sizeof(struct max7301), GFP_KERNEL); 44 if (!ts) 45 return -ENOMEM; 46 47 ts->read = max7300_i2c_read; 48 ts->write = max7300_i2c_write; 49 ts->dev = &client->dev; 50 51 return __max730x_probe(ts); 52 } 53 54 static int max7300_remove(struct i2c_client *client) 55 { 56 return __max730x_remove(&client->dev); 57 } 58 59 static const struct i2c_device_id max7300_id[] = { 60 { "max7300", 0 }, 61 { } 62 }; 63 MODULE_DEVICE_TABLE(i2c, max7300_id); 64 65 static struct i2c_driver max7300_driver = { 66 .driver = { 67 .name = "max7300", 68 .owner = THIS_MODULE, 69 }, 70 .probe = max7300_probe, 71 .remove = max7300_remove, 72 .id_table = max7300_id, 73 }; 74 75 static int __init max7300_init(void) 76 { 77 return i2c_add_driver(&max7300_driver); 78 } 79 subsys_initcall(max7300_init); 80 81 static void __exit max7300_exit(void) 82 { 83 i2c_del_driver(&max7300_driver); 84 } 85 module_exit(max7300_exit); 86 87 MODULE_AUTHOR("Wolfram Sang"); 88 MODULE_LICENSE("GPL v2"); 89 MODULE_DESCRIPTION("MAX7300 GPIO-Expander"); 90