1 /* 2 * SPI access for Dialog DA9052 PMICs. 3 * 4 * Copyright(c) 2011 Dialog Semiconductor Ltd. 5 * 6 * Author: David Dajun Chen <dchen@diasemi.com> 7 * 8 * This program is free software; you can redistribute it and/or modify 9 * it under the terms of the GNU General Public License as published by 10 * the Free Software Foundation; either version 2 of the License, or 11 * (at your option) any later version. 12 * 13 */ 14 15 #include <linux/device.h> 16 #include <linux/module.h> 17 #include <linux/input.h> 18 #include <linux/mfd/core.h> 19 #include <linux/spi/spi.h> 20 #include <linux/err.h> 21 22 #include <linux/mfd/da9052/da9052.h> 23 24 static int da9052_spi_probe(struct spi_device *spi) 25 { 26 int ret; 27 const struct spi_device_id *id = spi_get_device_id(spi); 28 struct da9052 *da9052 = kzalloc(sizeof(struct da9052), GFP_KERNEL); 29 30 if (!da9052) 31 return -ENOMEM; 32 33 spi->mode = SPI_MODE_0 | SPI_CPOL; 34 spi->bits_per_word = 8; 35 spi_setup(spi); 36 37 da9052->dev = &spi->dev; 38 da9052->chip_irq = spi->irq; 39 40 dev_set_drvdata(&spi->dev, da9052); 41 42 da9052_regmap_config.read_flag_mask = 1; 43 da9052_regmap_config.write_flag_mask = 0; 44 45 da9052->regmap = regmap_init_spi(spi, &da9052_regmap_config); 46 if (IS_ERR(da9052->regmap)) { 47 ret = PTR_ERR(da9052->regmap); 48 dev_err(&spi->dev, "Failed to allocate register map: %d\n", 49 ret); 50 goto err; 51 } 52 53 ret = da9052_device_init(da9052, id->driver_data); 54 if (ret != 0) 55 goto err_regmap; 56 57 return 0; 58 59 err_regmap: 60 regmap_exit(da9052->regmap); 61 err: 62 kfree(da9052); 63 return ret; 64 } 65 66 static int da9052_spi_remove(struct spi_device *spi) 67 { 68 struct da9052 *da9052 = dev_get_drvdata(&spi->dev); 69 70 da9052_device_exit(da9052); 71 regmap_exit(da9052->regmap); 72 kfree(da9052); 73 74 return 0; 75 } 76 77 static struct spi_device_id da9052_spi_id[] = { 78 {"da9052", DA9052}, 79 {"da9053-aa", DA9053_AA}, 80 {"da9053-ba", DA9053_BA}, 81 {"da9053-bb", DA9053_BB}, 82 {} 83 }; 84 85 static struct spi_driver da9052_spi_driver = { 86 .probe = da9052_spi_probe, 87 .remove = __devexit_p(da9052_spi_remove), 88 .id_table = da9052_spi_id, 89 .driver = { 90 .name = "da9052", 91 .bus = &spi_bus_type, 92 .owner = THIS_MODULE, 93 }, 94 }; 95 96 static int __init da9052_spi_init(void) 97 { 98 int ret; 99 100 ret = spi_register_driver(&da9052_spi_driver); 101 if (ret != 0) { 102 pr_err("Failed to register DA9052 SPI driver, %d\n", ret); 103 return ret; 104 } 105 106 return 0; 107 } 108 subsys_initcall(da9052_spi_init); 109 110 static void __exit da9052_spi_exit(void) 111 { 112 spi_unregister_driver(&da9052_spi_driver); 113 } 114 module_exit(da9052_spi_exit); 115 116 MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>"); 117 MODULE_DESCRIPTION("SPI driver for Dialog DA9052 PMIC"); 118 MODULE_LICENSE("GPL"); 119