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 const struct i2c_device_id *id) 34 { 35 struct lan9303_i2c *sw_dev; 36 int ret; 37 38 sw_dev = devm_kzalloc(&client->dev, sizeof(struct lan9303_i2c), 39 GFP_KERNEL); 40 if (!sw_dev) 41 return -ENOMEM; 42 43 sw_dev->chip.regmap = devm_regmap_init_i2c(client, 44 &lan9303_i2c_regmap_config); 45 if (IS_ERR(sw_dev->chip.regmap)) { 46 ret = PTR_ERR(sw_dev->chip.regmap); 47 dev_err(&client->dev, "Failed to allocate register map: %d\n", 48 ret); 49 return ret; 50 } 51 52 /* link forward and backward */ 53 sw_dev->device = client; 54 i2c_set_clientdata(client, sw_dev); 55 sw_dev->chip.dev = &client->dev; 56 57 sw_dev->chip.ops = &lan9303_indirect_phy_ops; 58 59 ret = lan9303_probe(&sw_dev->chip, client->dev.of_node); 60 if (ret != 0) 61 return ret; 62 63 dev_info(&client->dev, "LAN9303 I2C driver loaded successfully\n"); 64 65 return 0; 66 } 67 68 static int lan9303_i2c_remove(struct i2c_client *client) 69 { 70 struct lan9303_i2c *sw_dev = i2c_get_clientdata(client); 71 72 if (!sw_dev) 73 return 0; 74 75 lan9303_remove(&sw_dev->chip); 76 77 i2c_set_clientdata(client, NULL); 78 79 return 0; 80 } 81 82 static void lan9303_i2c_shutdown(struct i2c_client *client) 83 { 84 struct lan9303_i2c *sw_dev = i2c_get_clientdata(client); 85 86 if (!sw_dev) 87 return; 88 89 lan9303_shutdown(&sw_dev->chip); 90 91 i2c_set_clientdata(client, NULL); 92 } 93 94 /*-------------------------------------------------------------------------*/ 95 96 static const struct i2c_device_id lan9303_i2c_id[] = { 97 { "lan9303", 0 }, 98 { /* sentinel */ } 99 }; 100 MODULE_DEVICE_TABLE(i2c, lan9303_i2c_id); 101 102 static const struct of_device_id lan9303_i2c_of_match[] = { 103 { .compatible = "smsc,lan9303-i2c", }, 104 { /* sentinel */ }, 105 }; 106 MODULE_DEVICE_TABLE(of, lan9303_i2c_of_match); 107 108 static struct i2c_driver lan9303_i2c_driver = { 109 .driver = { 110 .name = "LAN9303_I2C", 111 .of_match_table = of_match_ptr(lan9303_i2c_of_match), 112 }, 113 .probe = lan9303_i2c_probe, 114 .remove = lan9303_i2c_remove, 115 .shutdown = lan9303_i2c_shutdown, 116 .id_table = lan9303_i2c_id, 117 }; 118 module_i2c_driver(lan9303_i2c_driver); 119 120 MODULE_AUTHOR("Juergen Borleis <kernel@pengutronix.de>"); 121 MODULE_DESCRIPTION("Driver for SMSC/Microchip LAN9303 three port ethernet switch in I2C managed mode"); 122 MODULE_LICENSE("GPL v2"); 123