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 { 33 struct max7301 *ts; 34 35 if (!i2c_check_functionality(client->adapter, 36 I2C_FUNC_SMBUS_BYTE_DATA)) 37 return -EIO; 38 39 ts = devm_kzalloc(&client->dev, sizeof(struct max7301), GFP_KERNEL); 40 if (!ts) 41 return -ENOMEM; 42 43 ts->read = max7300_i2c_read; 44 ts->write = max7300_i2c_write; 45 ts->dev = &client->dev; 46 47 return __max730x_probe(ts); 48 } 49 50 static void max7300_remove(struct i2c_client *client) 51 { 52 __max730x_remove(&client->dev); 53 } 54 55 static const struct i2c_device_id max7300_id[] = { 56 { "max7300", 0 }, 57 { } 58 }; 59 MODULE_DEVICE_TABLE(i2c, max7300_id); 60 61 static struct i2c_driver max7300_driver = { 62 .driver = { 63 .name = "max7300", 64 }, 65 .probe = max7300_probe, 66 .remove = max7300_remove, 67 .id_table = max7300_id, 68 }; 69 70 static int __init max7300_init(void) 71 { 72 return i2c_add_driver(&max7300_driver); 73 } 74 subsys_initcall(max7300_init); 75 76 static void __exit max7300_exit(void) 77 { 78 i2c_del_driver(&max7300_driver); 79 } 80 module_exit(max7300_exit); 81 82 MODULE_AUTHOR("Wolfram Sang"); 83 MODULE_LICENSE("GPL v2"); 84 MODULE_DESCRIPTION("MAX7300 GPIO-Expander"); 85