1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Microchip KSZ9477 series register access through I2C 4 * 5 * Copyright (C) 2018-2019 Microchip Technology Inc. 6 */ 7 8 #include <linux/i2c.h> 9 #include <linux/kernel.h> 10 #include <linux/module.h> 11 #include <linux/regmap.h> 12 13 #include "ksz_common.h" 14 15 KSZ_REGMAP_TABLE(ksz9477, not_used, 16, 0, 0); 16 17 static int ksz9477_i2c_probe(struct i2c_client *i2c) 18 { 19 struct regmap_config rc; 20 struct ksz_device *dev; 21 int i, ret; 22 23 dev = ksz_switch_alloc(&i2c->dev, i2c); 24 if (!dev) 25 return -ENOMEM; 26 27 for (i = 0; i < __KSZ_NUM_REGMAPS; i++) { 28 rc = ksz9477_regmap_config[i]; 29 rc.lock_arg = &dev->regmap_mutex; 30 dev->regmap[i] = devm_regmap_init_i2c(i2c, &rc); 31 if (IS_ERR(dev->regmap[i])) { 32 return dev_err_probe(&i2c->dev, PTR_ERR(dev->regmap[i]), 33 "Failed to initialize regmap%i\n", 34 ksz9477_regmap_config[i].val_bits); 35 } 36 } 37 38 if (i2c->dev.platform_data) 39 dev->pdata = i2c->dev.platform_data; 40 41 dev->irq = i2c->irq; 42 43 ret = ksz_switch_register(dev); 44 45 /* Main DSA driver may not be started yet. */ 46 if (ret) 47 return ret; 48 49 i2c_set_clientdata(i2c, dev); 50 51 return 0; 52 } 53 54 static void ksz9477_i2c_remove(struct i2c_client *i2c) 55 { 56 struct ksz_device *dev = i2c_get_clientdata(i2c); 57 58 if (dev) 59 ksz_switch_remove(dev); 60 } 61 62 static void ksz9477_i2c_shutdown(struct i2c_client *i2c) 63 { 64 struct ksz_device *dev = i2c_get_clientdata(i2c); 65 66 if (!dev) 67 return; 68 69 if (dev->dev_ops->reset) 70 dev->dev_ops->reset(dev); 71 72 dsa_switch_shutdown(dev->ds); 73 74 i2c_set_clientdata(i2c, NULL); 75 } 76 77 static const struct i2c_device_id ksz9477_i2c_id[] = { 78 { "ksz9477-switch", 0 }, 79 {}, 80 }; 81 82 MODULE_DEVICE_TABLE(i2c, ksz9477_i2c_id); 83 84 static const struct of_device_id ksz9477_dt_ids[] = { 85 { 86 .compatible = "microchip,ksz9477", 87 .data = &ksz_switch_chips[KSZ9477] 88 }, 89 { 90 .compatible = "microchip,ksz9896", 91 .data = &ksz_switch_chips[KSZ9896] 92 }, 93 { 94 .compatible = "microchip,ksz9897", 95 .data = &ksz_switch_chips[KSZ9897] 96 }, 97 { 98 .compatible = "microchip,ksz9893", 99 .data = &ksz_switch_chips[KSZ9893] 100 }, 101 { 102 .compatible = "microchip,ksz9563", 103 .data = &ksz_switch_chips[KSZ9563] 104 }, 105 { 106 .compatible = "microchip,ksz8563", 107 .data = &ksz_switch_chips[KSZ8563] 108 }, 109 { 110 .compatible = "microchip,ksz9567", 111 .data = &ksz_switch_chips[KSZ9567] 112 }, 113 {}, 114 }; 115 MODULE_DEVICE_TABLE(of, ksz9477_dt_ids); 116 117 static struct i2c_driver ksz9477_i2c_driver = { 118 .driver = { 119 .name = "ksz9477-switch", 120 .of_match_table = ksz9477_dt_ids, 121 }, 122 .probe = ksz9477_i2c_probe, 123 .remove = ksz9477_i2c_remove, 124 .shutdown = ksz9477_i2c_shutdown, 125 .id_table = ksz9477_i2c_id, 126 }; 127 128 module_i2c_driver(ksz9477_i2c_driver); 129 130 MODULE_AUTHOR("Tristram Ha <Tristram.Ha@microchip.com>"); 131 MODULE_DESCRIPTION("Microchip KSZ9477 Series Switch I2C access Driver"); 132 MODULE_LICENSE("GPL v2"); 133