1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * BQ257XX Core Driver 4 * Copyright (C) 2025 Chris Morgan <macromorgan@hotmail.com> 5 */ 6 7 #include <linux/device.h> 8 #include <linux/i2c.h> 9 #include <linux/mfd/bq257xx.h> 10 #include <linux/mfd/core.h> 11 #include <linux/regmap.h> 12 13 static const struct regmap_range bq25703_readonly_reg_ranges[] = { 14 regmap_reg_range(BQ25703_CHARGER_STATUS, BQ25703_MANUFACT_DEV_ID), 15 }; 16 17 static const struct regmap_access_table bq25703_writeable_regs = { 18 .no_ranges = bq25703_readonly_reg_ranges, 19 .n_no_ranges = ARRAY_SIZE(bq25703_readonly_reg_ranges), 20 }; 21 22 static const struct regmap_range bq25703_volatile_reg_ranges[] = { 23 regmap_reg_range(BQ25703_CHARGE_OPTION_0, BQ25703_IIN_HOST), 24 regmap_reg_range(BQ25703_CHARGER_STATUS, BQ25703_ADC_OPTION), 25 }; 26 27 static const struct regmap_access_table bq25703_volatile_regs = { 28 .yes_ranges = bq25703_volatile_reg_ranges, 29 .n_yes_ranges = ARRAY_SIZE(bq25703_volatile_reg_ranges), 30 }; 31 32 static const struct regmap_config bq25703_regmap_config = { 33 .reg_bits = 8, 34 .val_bits = 16, 35 .max_register = BQ25703_ADC_OPTION, 36 .cache_type = REGCACHE_MAPLE, 37 .wr_table = &bq25703_writeable_regs, 38 .volatile_table = &bq25703_volatile_regs, 39 .val_format_endian = REGMAP_ENDIAN_LITTLE, 40 }; 41 42 static const struct mfd_cell cells[] = { 43 MFD_CELL_NAME("bq257xx-regulator"), 44 MFD_CELL_NAME("bq257xx-charger"), 45 }; 46 47 static int bq257xx_probe(struct i2c_client *client) 48 { 49 struct bq257xx_device *ddata; 50 int ret; 51 52 ddata = devm_kzalloc(&client->dev, sizeof(*ddata), GFP_KERNEL); 53 if (!ddata) 54 return -ENOMEM; 55 56 ddata->client = client; 57 58 ddata->regmap = devm_regmap_init_i2c(client, &bq25703_regmap_config); 59 if (IS_ERR(ddata->regmap)) { 60 return dev_err_probe(&client->dev, PTR_ERR(ddata->regmap), 61 "Failed to allocate register map\n"); 62 } 63 64 i2c_set_clientdata(client, ddata); 65 66 ret = devm_mfd_add_devices(&client->dev, PLATFORM_DEVID_AUTO, 67 cells, ARRAY_SIZE(cells), NULL, 0, NULL); 68 if (ret) 69 return dev_err_probe(&client->dev, ret, 70 "Failed to register child devices\n"); 71 72 return ret; 73 } 74 75 static const struct i2c_device_id bq257xx_i2c_ids[] = { 76 { "bq25703a" }, 77 {} 78 }; 79 MODULE_DEVICE_TABLE(i2c, bq257xx_i2c_ids); 80 81 static const struct of_device_id bq257xx_of_match[] = { 82 { .compatible = "ti,bq25703a" }, 83 {} 84 }; 85 MODULE_DEVICE_TABLE(of, bq257xx_of_match); 86 87 static struct i2c_driver bq257xx_driver = { 88 .driver = { 89 .name = "bq257xx", 90 .of_match_table = bq257xx_of_match, 91 }, 92 .probe = bq257xx_probe, 93 .id_table = bq257xx_i2c_ids, 94 }; 95 module_i2c_driver(bq257xx_driver); 96 97 MODULE_DESCRIPTION("bq257xx buck/boost/charger driver"); 98 MODULE_AUTHOR("Chris Morgan <macromorgan@hotmail.com>"); 99 MODULE_LICENSE("GPL"); 100