drivers/mfd/da9052-spi.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * SPI access for Dialog DA9052 PMICs.
   4  *
   5  * Copyright(c) 2011 Dialog Semiconductor Ltd.
   6  *
   7  * Author: David Dajun Chen <dchen@diasemi.com>
   8  */
   9
  10 #include <linux/device.h>
  11 #include <linux/module.h>
  12 #include <linux/input.h>
  13 #include <linux/mfd/core.h>
  14 #include <linux/spi/spi.h>
  15 #include <linux/err.h>
  16
  17 #include <linux/mfd/da9052/da9052.h>
  18
  19 static int da9052_spi_probe(struct spi_device *spi)
  20 {
  21         struct regmap_config config;
  22         int ret;
  23         const struct spi_device_id *id = spi_get_device_id(spi);
  24         struct da9052 *da9052;
  25
  26         da9052 = devm_kzalloc(&spi->dev, sizeof(struct da9052), GFP_KERNEL);
  27         if (!da9052)
  28                 return -ENOMEM;
  29
  30         spi->mode = SPI_MODE_0;
  31         spi->bits_per_word = 8;
  32         spi_setup(spi);
  33
  34         da9052->dev = &spi->dev;
  35         da9052->chip_irq = spi->irq;
  36
  37         spi_set_drvdata(spi, da9052);
  38
  39         config = da9052_regmap_config;
  40         config.write_flag_mask = 1;
  41         config.reg_bits = 7;
  42         config.pad_bits = 1;
  43         config.val_bits = 8;
  44         config.use_single_read = true;
  45         config.use_single_write = true;
  46
  47         da9052->regmap = devm_regmap_init_spi(spi, &config);
  48         if (IS_ERR(da9052->regmap)) {
  49                 ret = PTR_ERR(da9052->regmap);
  50                 dev_err(&spi->dev, "Failed to allocate register map: %d\n",
  51                         ret);
  52                 return ret;
  53         }
  54
  55         return da9052_device_init(da9052, id->driver_data);
  56 }
  57
  58 static void da9052_spi_remove(struct spi_device *spi)
  59 {
  60         struct da9052 *da9052 = spi_get_drvdata(spi);
  61
  62         da9052_device_exit(da9052);
  63 }
  64
  65 static const struct spi_device_id da9052_spi_id[] = {
  66         {"da9052", DA9052},
  67         {"da9053-aa", DA9053_AA},
  68         {"da9053-ba", DA9053_BA},
  69         {"da9053-bb", DA9053_BB},
  70         {"da9053-bc", DA9053_BC},
  71         {}
  72 };
  73
  74 static struct spi_driver da9052_spi_driver = {
  75         .probe = da9052_spi_probe,
  76         .remove = da9052_spi_remove,
  77         .id_table = da9052_spi_id,
  78         .driver = {
  79                 .name = "da9052",
  80         },
  81 };
  82
  83 static int __init da9052_spi_init(void)
  84 {
  85         int ret;
  86
  87         ret = spi_register_driver(&da9052_spi_driver);
  88         if (ret != 0) {
  89                 pr_err("Failed to register DA9052 SPI driver, %d\n", ret);
  90                 return ret;
  91         }
  92
  93         return 0;
  94 }
  95 subsys_initcall(da9052_spi_init);
  96
  97 static void __exit da9052_spi_exit(void)
  98 {
  99         spi_unregister_driver(&da9052_spi_driver);
 100 }
 101 module_exit(da9052_spi_exit);
 102
 103 MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>");
 104 MODULE_DESCRIPTION("SPI driver for Dialog DA9052 PMIC");