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/array_size.h> 10 #include <linux/err.h> 11 #include <linux/i2c.h> 12 #include <linux/mfd/cs42l43.h> 13 #include <linux/mfd/cs42l43-regs.h> 14 #include <linux/mod_devicetable.h> 15 #include <linux/module.h> 16 #include <linux/pm.h> 17 #include <linux/regmap.h> 18 19 #include "cs42l43.h" 20 21 static const struct regmap_config cs42l43_i2c_regmap = { 22 .reg_bits = 32, 23 .reg_stride = 4, 24 .val_bits = 32, 25 .reg_format_endian = REGMAP_ENDIAN_BIG, 26 .val_format_endian = REGMAP_ENDIAN_BIG, 27 28 .max_register = CS42L43_MCU_RAM_MAX, 29 .readable_reg = cs42l43_readable_register, 30 .volatile_reg = cs42l43_volatile_register, 31 .precious_reg = cs42l43_precious_register, 32 33 .cache_type = REGCACHE_MAPLE, 34 .reg_defaults = cs42l43_reg_default, 35 .num_reg_defaults = ARRAY_SIZE(cs42l43_reg_default), 36 }; 37 38 static int cs42l43_i2c_probe(struct i2c_client *i2c) 39 { 40 struct cs42l43 *cs42l43; 41 42 cs42l43 = devm_kzalloc(&i2c->dev, sizeof(*cs42l43), GFP_KERNEL); 43 if (!cs42l43) 44 return -ENOMEM; 45 46 cs42l43->dev = &i2c->dev; 47 cs42l43->irq = i2c->irq; 48 /* A device on an I2C is always attached by definition. */ 49 cs42l43->attached = true; 50 51 cs42l43->regmap = devm_regmap_init_i2c(i2c, &cs42l43_i2c_regmap); 52 if (IS_ERR(cs42l43->regmap)) 53 return dev_err_probe(cs42l43->dev, PTR_ERR(cs42l43->regmap), 54 "Failed to allocate regmap\n"); 55 56 return cs42l43_dev_probe(cs42l43); 57 } 58 59 static void cs42l43_i2c_remove(struct i2c_client *i2c) 60 { 61 struct cs42l43 *cs42l43 = dev_get_drvdata(&i2c->dev); 62 63 cs42l43_dev_remove(cs42l43); 64 } 65 66 #if IS_ENABLED(CONFIG_OF) 67 static const struct of_device_id cs42l43_of_match[] = { 68 { .compatible = "cirrus,cs42l43", }, 69 {} 70 }; 71 MODULE_DEVICE_TABLE(of, cs42l43_of_match); 72 #endif 73 74 #if IS_ENABLED(CONFIG_ACPI) 75 static const struct acpi_device_id cs42l43_acpi_match[] = { 76 { "CSC4243", 0 }, 77 {} 78 }; 79 MODULE_DEVICE_TABLE(acpi, cs42l43_acpi_match); 80 #endif 81 82 static struct i2c_driver cs42l43_i2c_driver = { 83 .driver = { 84 .name = "cs42l43", 85 .pm = pm_ptr(&cs42l43_pm_ops), 86 .of_match_table = of_match_ptr(cs42l43_of_match), 87 .acpi_match_table = ACPI_PTR(cs42l43_acpi_match), 88 }, 89 90 .probe = cs42l43_i2c_probe, 91 .remove = cs42l43_i2c_remove, 92 }; 93 module_i2c_driver(cs42l43_i2c_driver); 94 95 MODULE_IMPORT_NS(MFD_CS42L43); 96 97 MODULE_DESCRIPTION("CS42L43 I2C Driver"); 98 MODULE_AUTHOR("Charles Keepax <ckeepax@opensource.cirrus.com>"); 99 MODULE_LICENSE("GPL"); 100