| Mattias Wallin | 39368ed | 2010-09-15 13:12:03 +0200 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) ST-Ericsson SA 2010 |
| 3 | * Author: Mattias Wallin <mattias.wallin@stericsson.com> for ST-Ericsson. |
| 4 | * License Terms: GNU General Public License v2 |
| 5 | * This file was based on drivers/mfd/ab8500-spi.c |
| 6 | */ |
| 7 | |
| 8 | #include <linux/kernel.h> |
| 9 | #include <linux/slab.h> |
| 10 | #include <linux/init.h> |
| 11 | #include <linux/module.h> |
| 12 | #include <linux/platform_device.h> |
| 13 | #include <linux/mfd/ab8500.h> |
| 14 | |
| 15 | #include <mach/prcmu.h> |
| 16 | |
| 17 | static int ab8500_i2c_write(struct ab8500 *ab8500, u16 addr, u8 data) |
| 18 | { |
| 19 | int ret; |
| 20 | |
| 21 | ret = prcmu_abb_write((u8)(addr >> 8), (u8)(addr & 0xFF), &data, 1); |
| 22 | if (ret < 0) |
| 23 | dev_err(ab8500->dev, "prcmu i2c error %d\n", ret); |
| 24 | return ret; |
| 25 | } |
| 26 | |
| 27 | static int ab8500_i2c_read(struct ab8500 *ab8500, u16 addr) |
| 28 | { |
| 29 | int ret; |
| 30 | u8 data; |
| 31 | |
| 32 | ret = prcmu_abb_read((u8)(addr >> 8), (u8)(addr & 0xFF), &data, 1); |
| 33 | if (ret < 0) { |
| 34 | dev_err(ab8500->dev, "prcmu i2c error %d\n", ret); |
| 35 | return ret; |
| 36 | } |
| 37 | return (int)data; |
| 38 | } |
| 39 | |
| 40 | static int __devinit ab8500_i2c_probe(struct platform_device *plf) |
| 41 | { |
| 42 | struct ab8500 *ab8500; |
| 43 | struct resource *resource; |
| 44 | int ret; |
| 45 | |
| 46 | ab8500 = kzalloc(sizeof *ab8500, GFP_KERNEL); |
| 47 | if (!ab8500) |
| 48 | return -ENOMEM; |
| 49 | |
| 50 | ab8500->dev = &plf->dev; |
| 51 | |
| 52 | resource = platform_get_resource(plf, IORESOURCE_IRQ, 0); |
| 53 | if (!resource) { |
| 54 | kfree(ab8500); |
| 55 | return -ENODEV; |
| 56 | } |
| 57 | |
| 58 | ab8500->irq = resource->start; |
| 59 | |
| 60 | ab8500->read = ab8500_i2c_read; |
| 61 | ab8500->write = ab8500_i2c_write; |
| 62 | |
| 63 | platform_set_drvdata(plf, ab8500); |
| 64 | |
| 65 | ret = ab8500_init(ab8500); |
| 66 | if (ret) |
| 67 | kfree(ab8500); |
| 68 | |
| 69 | return ret; |
| 70 | } |
| 71 | |
| 72 | static int __devexit ab8500_i2c_remove(struct platform_device *plf) |
| 73 | { |
| 74 | struct ab8500 *ab8500 = platform_get_drvdata(plf); |
| 75 | |
| 76 | ab8500_exit(ab8500); |
| 77 | kfree(ab8500); |
| 78 | |
| 79 | return 0; |
| 80 | } |
| 81 | |
| 82 | static struct platform_driver ab8500_i2c_driver = { |
| 83 | .driver = { |
| 84 | .name = "ab8500-i2c", |
| 85 | .owner = THIS_MODULE, |
| 86 | }, |
| 87 | .probe = ab8500_i2c_probe, |
| 88 | .remove = __devexit_p(ab8500_i2c_remove) |
| 89 | }; |
| 90 | |
| 91 | static int __init ab8500_i2c_init(void) |
| 92 | { |
| 93 | return platform_driver_register(&ab8500_i2c_driver); |
| 94 | } |
| 95 | |
| 96 | static void __exit ab8500_i2c_exit(void) |
| 97 | { |
| 98 | platform_driver_unregister(&ab8500_i2c_driver); |
| 99 | } |
| 100 | subsys_initcall(ab8500_i2c_init); |
| 101 | module_exit(ab8500_i2c_exit); |
| 102 | |
| 103 | MODULE_AUTHOR("Mattias WALLIN <mattias.wallin@stericsson.com"); |
| 104 | MODULE_DESCRIPTION("AB8500 Core access via PRCMU I2C"); |
| 105 | MODULE_LICENSE("GPL v2"); |