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 const struct i2c_device_id *i2c_id) 19 { 20 struct regmap_config rc; 21 struct ksz_device *dev; 22 int i, ret; 23 24 dev = ksz_switch_alloc(&i2c->dev, i2c); 25 if (!dev) 26 return -ENOMEM; 27 28 for (i = 0; i < ARRAY_SIZE(ksz9477_regmap_config); i++) { 29 rc = ksz9477_regmap_config[i]; 30 rc.lock_arg = &dev->regmap_mutex; 31 dev->regmap[i] = devm_regmap_init_i2c(i2c, &rc); 32 if (IS_ERR(dev->regmap[i])) { 33 ret = PTR_ERR(dev->regmap[i]); 34 dev_err(&i2c->dev, 35 "Failed to initialize regmap%i: %d\n", 36 ksz9477_regmap_config[i].val_bits, ret); 37 return ret; 38 } 39 } 40 41 if (i2c->dev.platform_data) 42 dev->pdata = i2c->dev.platform_data; 43 44 ret = ksz9477_switch_register(dev); 45 46 /* Main DSA driver may not be started yet. */ 47 if (ret) 48 return ret; 49 50 i2c_set_clientdata(i2c, dev); 51 52 return 0; 53 } 54 55 static int ksz9477_i2c_remove(struct i2c_client *i2c) 56 { 57 struct ksz_device *dev = i2c_get_clientdata(i2c); 58 59 if (dev) 60 ksz_switch_remove(dev); 61 62 i2c_set_clientdata(i2c, NULL); 63 64 return 0; 65 } 66 67 static void ksz9477_i2c_shutdown(struct i2c_client *i2c) 68 { 69 struct ksz_device *dev = i2c_get_clientdata(i2c); 70 71 if (!dev) 72 return; 73 74 if (dev->dev_ops->shutdown) 75 dev->dev_ops->shutdown(dev); 76 77 dsa_switch_shutdown(dev->ds); 78 79 i2c_set_clientdata(i2c, NULL); 80 } 81 82 static const struct i2c_device_id ksz9477_i2c_id[] = { 83 { "ksz9477-switch", 0 }, 84 {}, 85 }; 86 87 MODULE_DEVICE_TABLE(i2c, ksz9477_i2c_id); 88 89 static const struct of_device_id ksz9477_dt_ids[] = { 90 { .compatible = "microchip,ksz9477" }, 91 { .compatible = "microchip,ksz9897" }, 92 { .compatible = "microchip,ksz9893" }, 93 { .compatible = "microchip,ksz9563" }, 94 { .compatible = "microchip,ksz9567" }, 95 {}, 96 }; 97 MODULE_DEVICE_TABLE(of, ksz9477_dt_ids); 98 99 static struct i2c_driver ksz9477_i2c_driver = { 100 .driver = { 101 .name = "ksz9477-switch", 102 .of_match_table = of_match_ptr(ksz9477_dt_ids), 103 }, 104 .probe = ksz9477_i2c_probe, 105 .remove = ksz9477_i2c_remove, 106 .shutdown = ksz9477_i2c_shutdown, 107 .id_table = ksz9477_i2c_id, 108 }; 109 110 module_i2c_driver(ksz9477_i2c_driver); 111 112 MODULE_AUTHOR("Tristram Ha <Tristram.Ha@microchip.com>"); 113 MODULE_DESCRIPTION("Microchip KSZ9477 Series Switch I2C access Driver"); 114 MODULE_LICENSE("GPL v2"); 115