1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (C) 2017 Pengutronix, Juergen Borleis <kernel@pengutronix.de> 4 */ 5 #include <linux/kernel.h> 6 #include <linux/module.h> 7 #include <linux/i2c.h> 8 #include <linux/of.h> 9 10 #include "lan9303.h" 11 12 struct lan9303_i2c { 13 struct i2c_client *device; 14 struct lan9303 chip; 15 }; 16 17 static const struct regmap_config lan9303_i2c_regmap_config = { 18 .reg_bits = 8, 19 .val_bits = 32, 20 .reg_stride = 1, 21 .can_multi_write = true, 22 .max_register = 0x0ff, /* address bits 0..1 are not used */ 23 .reg_format_endian = REGMAP_ENDIAN_LITTLE, 24 25 .volatile_table = &lan9303_register_set, 26 .wr_table = &lan9303_register_set, 27 .rd_table = &lan9303_register_set, 28 29 .cache_type = REGCACHE_NONE, 30 }; 31 32 static int lan9303_i2c_probe(struct i2c_client *client) 33 { 34 struct lan9303_i2c *sw_dev; 35 int ret; 36 37 sw_dev = devm_kzalloc(&client->dev, sizeof(struct lan9303_i2c), 38 GFP_KERNEL); 39 if (!sw_dev) 40 return -ENOMEM; 41 42 sw_dev->chip.regmap = devm_regmap_init_i2c(client, 43 &lan9303_i2c_regmap_config); 44 if (IS_ERR(sw_dev->chip.regmap)) { 45 ret = PTR_ERR(sw_dev->chip.regmap); 46 dev_err(&client->dev, "Failed to allocate register map: %d\n", 47 ret); 48 return ret; 49 } 50 51 /* link forward and backward */ 52 sw_dev->device = client; 53 i2c_set_clientdata(client, sw_dev); 54 sw_dev->chip.dev = &client->dev; 55 56 sw_dev->chip.ops = &lan9303_indirect_phy_ops; 57 58 ret = lan9303_probe(&sw_dev->chip, client->dev.of_node); 59 if (ret != 0) 60 return ret; 61 62 dev_info(&client->dev, "LAN9303 I2C driver loaded successfully\n"); 63 64 return 0; 65 } 66 67 static void lan9303_i2c_remove(struct i2c_client *client) 68 { 69 struct lan9303_i2c *sw_dev = i2c_get_clientdata(client); 70 71 if (!sw_dev) 72 return; 73 74 lan9303_remove(&sw_dev->chip); 75 } 76 77 static void lan9303_i2c_shutdown(struct i2c_client *client) 78 { 79 struct lan9303_i2c *sw_dev = i2c_get_clientdata(client); 80 81 if (!sw_dev) 82 return; 83 84 lan9303_shutdown(&sw_dev->chip); 85 86 i2c_set_clientdata(client, NULL); 87 } 88 89 /*-------------------------------------------------------------------------*/ 90 91 static const struct i2c_device_id lan9303_i2c_id[] = { 92 { "lan9303" }, 93 { /* sentinel */ } 94 }; 95 MODULE_DEVICE_TABLE(i2c, lan9303_i2c_id); 96 97 static const struct of_device_id lan9303_i2c_of_match[] = { 98 { .compatible = "smsc,lan9303-i2c", }, 99 { /* sentinel */ }, 100 }; 101 MODULE_DEVICE_TABLE(of, lan9303_i2c_of_match); 102 103 static struct i2c_driver lan9303_i2c_driver = { 104 .driver = { 105 .name = "LAN9303_I2C", 106 .of_match_table = lan9303_i2c_of_match, 107 }, 108 .probe = lan9303_i2c_probe, 109 .remove = lan9303_i2c_remove, 110 .shutdown = lan9303_i2c_shutdown, 111 .id_table = lan9303_i2c_id, 112 }; 113 module_i2c_driver(lan9303_i2c_driver); 114 115 MODULE_AUTHOR("Juergen Borleis <kernel@pengutronix.de>"); 116 MODULE_DESCRIPTION("Driver for SMSC/Microchip LAN9303 three port ethernet switch in I2C managed mode"); 117 MODULE_LICENSE("GPL v2"); 118