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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 | // SPDX-License-Identifier: GPL-2.0 /* * Copyright (C) 2020 NovaTech LLC * George McCollister <george.mccollister@gmail.com> */ #include <linux/bits.h> #include <linux/i2c.h> #include <linux/module.h> #include "xrs700x.h" #include "xrs700x_reg.h" struct xrs700x_i2c_cmd { __be32 reg; __be16 val; } __packed; static int xrs700x_i2c_reg_read(void *context, unsigned int reg, unsigned int *val) { struct device *dev = context; struct i2c_client *i2c = to_i2c_client(dev); struct xrs700x_i2c_cmd cmd; int ret; cmd.reg = cpu_to_be32(reg | 1); ret = i2c_master_send(i2c, (char *)&cmd.reg, sizeof(cmd.reg)); if (ret < 0) { dev_err(dev, "xrs i2c_master_send returned %d\n", ret); return ret; } ret = i2c_master_recv(i2c, (char *)&cmd.val, sizeof(cmd.val)); if (ret < 0) { dev_err(dev, "xrs i2c_master_recv returned %d\n", ret); return ret; } *val = be16_to_cpu(cmd.val); return 0; } static int xrs700x_i2c_reg_write(void *context, unsigned int reg, unsigned int val) { struct device *dev = context; struct i2c_client *i2c = to_i2c_client(dev); struct xrs700x_i2c_cmd cmd; int ret; cmd.reg = cpu_to_be32(reg); cmd.val = cpu_to_be16(val); ret = i2c_master_send(i2c, (char *)&cmd, sizeof(cmd)); if (ret < 0) { dev_err(dev, "xrs i2c_master_send returned %d\n", ret); return ret; } return 0; } static const struct regmap_config xrs700x_i2c_regmap_config = { .val_bits = 16, .reg_stride = 2, .reg_bits = 32, .pad_bits = 0, .write_flag_mask = 0, .read_flag_mask = 0, .reg_read = xrs700x_i2c_reg_read, .reg_write = xrs700x_i2c_reg_write, .max_register = 0, .cache_type = REGCACHE_NONE, .reg_format_endian = REGMAP_ENDIAN_BIG, .val_format_endian = REGMAP_ENDIAN_BIG }; static int xrs700x_i2c_probe(struct i2c_client *i2c) { struct xrs700x *priv; int ret; priv = xrs700x_switch_alloc(&i2c->dev, i2c); if (!priv) return -ENOMEM; priv->regmap = devm_regmap_init(&i2c->dev, NULL, &i2c->dev, &xrs700x_i2c_regmap_config); if (IS_ERR(priv->regmap)) { ret = PTR_ERR(priv->regmap); dev_err(&i2c->dev, "Failed to initialize regmap: %d\n", ret); return ret; } i2c_set_clientdata(i2c, priv); ret = xrs700x_switch_register(priv); /* Main DSA driver may not be started yet. */ if (ret) return ret; return 0; } static void xrs700x_i2c_remove(struct i2c_client *i2c) { struct xrs700x *priv = i2c_get_clientdata(i2c); if (!priv) return; xrs700x_switch_remove(priv); } static void xrs700x_i2c_shutdown(struct i2c_client *i2c) { struct xrs700x *priv = i2c_get_clientdata(i2c); if (!priv) return; xrs700x_switch_shutdown(priv); i2c_set_clientdata(i2c, NULL); } static const struct i2c_device_id xrs700x_i2c_id[] = { { "xrs700x-switch", 0 }, {}, }; MODULE_DEVICE_TABLE(i2c, xrs700x_i2c_id); static const struct of_device_id __maybe_unused xrs700x_i2c_dt_ids[] = { { .compatible = "arrow,xrs7003e", .data = &xrs7003e_info }, { .compatible = "arrow,xrs7003f", .data = &xrs7003f_info }, { .compatible = "arrow,xrs7004e", .data = &xrs7004e_info }, { .compatible = "arrow,xrs7004f", .data = &xrs7004f_info }, {}, }; MODULE_DEVICE_TABLE(of, xrs700x_i2c_dt_ids); static struct i2c_driver xrs700x_i2c_driver = { .driver = { .name = "xrs700x-i2c", .of_match_table = of_match_ptr(xrs700x_i2c_dt_ids), }, .probe = xrs700x_i2c_probe, .remove = xrs700x_i2c_remove, .shutdown = xrs700x_i2c_shutdown, .id_table = xrs700x_i2c_id, }; module_i2c_driver(xrs700x_i2c_driver); MODULE_AUTHOR("George McCollister <george.mccollister@gmail.com>"); MODULE_DESCRIPTION("Arrow SpeedChips XRS700x DSA I2C driver"); MODULE_LICENSE("GPL v2"); |