1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * CS42L43 I2C driver 4 * 5 * Copyright (C) 2022-2023 Cirrus Logic, Inc. and 6 * Cirrus Logic International Semiconductor Ltd. 7 */ 8 9 #include <linux/err.h> 10 #include <linux/errno.h> 11 #include <linux/i2c.h> 12 #include <linux/mfd/cs42l43-regs.h> 13 #include <linux/module.h> 14 15 #include "cs42l43.h" 16 17 static const struct regmap_config cs42l43_i2c_regmap = { 18 .reg_bits = 32, 19 .reg_stride = 4, 20 .val_bits = 32, 21 .reg_format_endian = REGMAP_ENDIAN_BIG, 22 .val_format_endian = REGMAP_ENDIAN_BIG, 23 24 .max_register = CS42L43_MCU_RAM_MAX, 25 .readable_reg = cs42l43_readable_register, 26 .volatile_reg = cs42l43_volatile_register, 27 .precious_reg = cs42l43_precious_register, 28 29 .cache_type = REGCACHE_MAPLE, 30 .reg_defaults = cs42l43_reg_default, 31 .num_reg_defaults = ARRAY_SIZE(cs42l43_reg_default), 32 }; 33 34 static int cs42l43_i2c_probe(struct i2c_client *i2c) 35 { 36 struct cs42l43 *cs42l43; 37 int ret; 38 39 cs42l43 = devm_kzalloc(&i2c->dev, sizeof(*cs42l43), GFP_KERNEL); 40 if (!cs42l43) 41 return -ENOMEM; 42 43 cs42l43->dev = &i2c->dev; 44 cs42l43->irq = i2c->irq; 45 /* A device on an I2C is always attached by definition. */ 46 cs42l43->attached = true; 47 48 cs42l43->regmap = devm_regmap_init_i2c(i2c, &cs42l43_i2c_regmap); 49 if (IS_ERR(cs42l43->regmap)) { 50 ret = PTR_ERR(cs42l43->regmap); 51 dev_err(cs42l43->dev, "Failed to allocate regmap: %d\n", ret); 52 return ret; 53 } 54 55 return cs42l43_dev_probe(cs42l43); 56 } 57 58 static void cs42l43_i2c_remove(struct i2c_client *i2c) 59 { 60 struct cs42l43 *cs42l43 = dev_get_drvdata(&i2c->dev); 61 62 cs42l43_dev_remove(cs42l43); 63 } 64 65 #if IS_ENABLED(CONFIG_OF) 66 static const struct of_device_id cs42l43_of_match[] = { 67 { .compatible = "cirrus,cs42l43", }, 68 {} 69 }; 70 MODULE_DEVICE_TABLE(of, cs42l43_of_match); 71 #endif 72 73 #if IS_ENABLED(CONFIG_ACPI) 74 static const struct acpi_device_id cs42l43_acpi_match[] = { 75 { "CSC4243", 0 }, 76 {} 77 }; 78 MODULE_DEVICE_TABLE(acpi, cs42l43_acpi_match); 79 #endif 80 81 static struct i2c_driver cs42l43_i2c_driver = { 82 .driver = { 83 .name = "cs42l43", 84 .pm = pm_ptr(&cs42l43_pm_ops), 85 .of_match_table = of_match_ptr(cs42l43_of_match), 86 .acpi_match_table = ACPI_PTR(cs42l43_acpi_match), 87 }, 88 89 .probe = cs42l43_i2c_probe, 90 .remove = cs42l43_i2c_remove, 91 }; 92 module_i2c_driver(cs42l43_i2c_driver); 93 94 MODULE_IMPORT_NS(MFD_CS42L43); 95 96 MODULE_DESCRIPTION("CS42L43 I2C Driver"); 97 MODULE_AUTHOR("Charles Keepax <ckeepax@opensource.cirrus.com>"); 98 MODULE_LICENSE("GPL"); 99