1 /* 2 * Copyright (C) 2017 Pengutronix, Juergen Borleis <kernel@pengutronix.de> 3 * 4 * This program is free software; you can redistribute it and/or 5 * modify it under the terms of the GNU General Public License 6 * version 2, as published by the Free Software Foundation. 7 * 8 * This program is distributed in the hope that it will be useful, 9 * but WITHOUT ANY WARRANTY; without even the implied warranty of 10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 11 * GNU General Public License for more details. 12 * 13 */ 14 #include <linux/kernel.h> 15 #include <linux/module.h> 16 #include <linux/i2c.h> 17 #include <linux/of.h> 18 19 #include "lan9303.h" 20 21 struct lan9303_i2c { 22 struct i2c_client *device; 23 struct lan9303 chip; 24 }; 25 26 static const struct regmap_config lan9303_i2c_regmap_config = { 27 .reg_bits = 8, 28 .val_bits = 32, 29 .reg_stride = 1, 30 .can_multi_write = true, 31 .max_register = 0x0ff, /* address bits 0..1 are not used */ 32 .reg_format_endian = REGMAP_ENDIAN_LITTLE, 33 34 .volatile_table = &lan9303_register_set, 35 .wr_table = &lan9303_register_set, 36 .rd_table = &lan9303_register_set, 37 38 .cache_type = REGCACHE_NONE, 39 }; 40 41 static int lan9303_i2c_probe(struct i2c_client *client, 42 const struct i2c_device_id *id) 43 { 44 struct lan9303_i2c *sw_dev; 45 int ret; 46 47 sw_dev = devm_kzalloc(&client->dev, sizeof(struct lan9303_i2c), 48 GFP_KERNEL); 49 if (!sw_dev) 50 return -ENOMEM; 51 52 sw_dev->chip.regmap = devm_regmap_init_i2c(client, 53 &lan9303_i2c_regmap_config); 54 if (IS_ERR(sw_dev->chip.regmap)) { 55 ret = PTR_ERR(sw_dev->chip.regmap); 56 dev_err(&client->dev, "Failed to allocate register map: %d\n", 57 ret); 58 return ret; 59 } 60 61 /* link forward and backward */ 62 sw_dev->device = client; 63 i2c_set_clientdata(client, sw_dev); 64 sw_dev->chip.dev = &client->dev; 65 66 ret = lan9303_probe(&sw_dev->chip, client->dev.of_node); 67 if (ret != 0) 68 return ret; 69 70 dev_info(&client->dev, "LAN9303 I2C driver loaded successfully\n"); 71 72 return 0; 73 } 74 75 static int lan9303_i2c_remove(struct i2c_client *client) 76 { 77 struct lan9303_i2c *sw_dev; 78 79 sw_dev = i2c_get_clientdata(client); 80 if (!sw_dev) 81 return -ENODEV; 82 83 return lan9303_remove(&sw_dev->chip); 84 } 85 86 /*-------------------------------------------------------------------------*/ 87 88 static const struct i2c_device_id lan9303_i2c_id[] = { 89 { "lan9303", 0 }, 90 { /* sentinel */ } 91 }; 92 MODULE_DEVICE_TABLE(i2c, lan9303_i2c_id); 93 94 static const struct of_device_id lan9303_i2c_of_match[] = { 95 { .compatible = "smsc,lan9303-i2c", }, 96 { /* sentinel */ }, 97 }; 98 MODULE_DEVICE_TABLE(of, lan9303_i2c_of_match); 99 100 static struct i2c_driver lan9303_i2c_driver = { 101 .driver = { 102 .name = "LAN9303_I2C", 103 .of_match_table = of_match_ptr(lan9303_i2c_of_match), 104 }, 105 .probe = lan9303_i2c_probe, 106 .remove = lan9303_i2c_remove, 107 .id_table = lan9303_i2c_id, 108 }; 109 module_i2c_driver(lan9303_i2c_driver); 110 111 MODULE_AUTHOR("Juergen Borleis <kernel@pengutronix.de>"); 112 MODULE_DESCRIPTION("Driver for SMSC/Microchip LAN9303 three port ethernet switch in I2C managed mode"); 113 MODULE_LICENSE("GPL v2"); 114