1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (C) 2009 Wolfram Sang, Pengutronix 4 * 5 * Check max730x.c for further details. 6 */ 7 8 #include <linux/module.h> 9 #include <linux/init.h> 10 #include <linux/platform_device.h> 11 #include <linux/mutex.h> 12 #include <linux/i2c.h> 13 #include <linux/spi/max7301.h> 14 #include <linux/slab.h> 15 16 static int max7300_i2c_write(struct device *dev, unsigned int reg, 17 unsigned int val) 18 { 19 struct i2c_client *client = to_i2c_client(dev); 20 21 return i2c_smbus_write_byte_data(client, reg, val); 22 } 23 24 static int max7300_i2c_read(struct device *dev, unsigned int reg) 25 { 26 struct i2c_client *client = to_i2c_client(dev); 27 28 return i2c_smbus_read_byte_data(client, reg); 29 } 30 31 static int max7300_probe(struct i2c_client *client, 32 const struct i2c_device_id *id) 33 { 34 struct max7301 *ts; 35 36 if (!i2c_check_functionality(client->adapter, 37 I2C_FUNC_SMBUS_BYTE_DATA)) 38 return -EIO; 39 40 ts = devm_kzalloc(&client->dev, sizeof(struct max7301), GFP_KERNEL); 41 if (!ts) 42 return -ENOMEM; 43 44 ts->read = max7300_i2c_read; 45 ts->write = max7300_i2c_write; 46 ts->dev = &client->dev; 47 48 return __max730x_probe(ts); 49 } 50 51 static int max7300_remove(struct i2c_client *client) 52 { 53 __max730x_remove(&client->dev); 54 55 return 0; 56 } 57 58 static const struct i2c_device_id max7300_id[] = { 59 { "max7300", 0 }, 60 { } 61 }; 62 MODULE_DEVICE_TABLE(i2c, max7300_id); 63 64 static struct i2c_driver max7300_driver = { 65 .driver = { 66 .name = "max7300", 67 }, 68 .probe = max7300_probe, 69 .remove = max7300_remove, 70 .id_table = max7300_id, 71 }; 72 73 static int __init max7300_init(void) 74 { 75 return i2c_add_driver(&max7300_driver); 76 } 77 subsys_initcall(max7300_init); 78 79 static void __exit max7300_exit(void) 80 { 81 i2c_del_driver(&max7300_driver); 82 } 83 module_exit(max7300_exit); 84 85 MODULE_AUTHOR("Wolfram Sang"); 86 MODULE_LICENSE("GPL v2"); 87 MODULE_DESCRIPTION("MAX7300 GPIO-Expander"); 88