drivers/mfd/da9052-spi.c

0001 // SPDX-License-Identifier: GPL-2.0-or-later
0002 /*
0003  * SPI access for Dialog DA9052 PMICs.
0004  *
0005  * Copyright(c) 2011 Dialog Semiconductor Ltd.
0006  *
0007  * Author: David Dajun Chen <dchen@diasemi.com>
0008  */
0009
0010 #include <linux/device.h>
0011 #include <linux/module.h>
0012 #include <linux/input.h>
0013 #include <linux/mfd/core.h>
0014 #include <linux/spi/spi.h>
0015 #include <linux/err.h>
0016
0017 #include <linux/mfd/da9052/da9052.h>
0018
0019 static int da9052_spi_probe(struct spi_device *spi)
0020 {
0021     struct regmap_config config;
0022     int ret;
0023     const struct spi_device_id *id = spi_get_device_id(spi);
0024     struct da9052 *da9052;
0025
0026     da9052 = devm_kzalloc(&spi->dev, sizeof(struct da9052), GFP_KERNEL);
0027     if (!da9052)
0028         return -ENOMEM;
0029
0030     spi->mode = SPI_MODE_0;
0031     spi->bits_per_word = 8;
0032     spi_setup(spi);
0033
0034     da9052->dev = &spi->dev;
0035     da9052->chip_irq = spi->irq;
0036
0037     spi_set_drvdata(spi, da9052);
0038
0039     config = da9052_regmap_config;
0040     config.read_flag_mask = 1;
0041     config.reg_bits = 7;
0042     config.pad_bits = 1;
0043     config.val_bits = 8;
0044     config.use_single_read = true;
0045     config.use_single_write = true;
0046
0047     da9052->regmap = devm_regmap_init_spi(spi, &config);
0048     if (IS_ERR(da9052->regmap)) {
0049         ret = PTR_ERR(da9052->regmap);
0050         dev_err(&spi->dev, "Failed to allocate register map: %d\n",
0051             ret);
0052         return ret;
0053     }
0054
0055     return da9052_device_init(da9052, id->driver_data);
0056 }
0057
0058 static void da9052_spi_remove(struct spi_device *spi)
0059 {
0060     struct da9052 *da9052 = spi_get_drvdata(spi);
0061
0062     da9052_device_exit(da9052);
0063 }
0064
0065 static const struct spi_device_id da9052_spi_id[] = {
0066     {"da9052", DA9052},
0067     {"da9053-aa", DA9053_AA},
0068     {"da9053-ba", DA9053_BA},
0069     {"da9053-bb", DA9053_BB},
0070     {"da9053-bc", DA9053_BC},
0071     {}
0072 };
0073
0074 static struct spi_driver da9052_spi_driver = {
0075     .probe = da9052_spi_probe,
0076     .remove = da9052_spi_remove,
0077     .id_table = da9052_spi_id,
0078     .driver = {
0079         .name = "da9052",
0080     },
0081 };
0082
0083 static int __init da9052_spi_init(void)
0084 {
0085     int ret;
0086
0087     ret = spi_register_driver(&da9052_spi_driver);
0088     if (ret != 0) {
0089         pr_err("Failed to register DA9052 SPI driver, %d\n", ret);
0090         return ret;
0091     }
0092
0093     return 0;
0094 }
0095 subsys_initcall(da9052_spi_init);
0096
0097 static void __exit da9052_spi_exit(void)
0098 {
0099     spi_unregister_driver(&da9052_spi_driver);
0100 }
0101 module_exit(da9052_spi_exit);
0102
0103 MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>");
0104 MODULE_DESCRIPTION("SPI driver for Dialog DA9052 PMIC");
0105 MODULE_LICENSE("GPL");