Sebastian Ott | f30664e | 2012-08-28 16:50:38 +0200 | [diff] [blame] | 1 | /* |
| 2 | * Device driver for s390 storage class memory. |
| 3 | * |
| 4 | * Copyright IBM Corp. 2012 |
| 5 | * Author(s): Sebastian Ott <sebott@linux.vnet.ibm.com> |
| 6 | */ |
| 7 | |
| 8 | #define KMSG_COMPONENT "scm_block" |
| 9 | #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt |
| 10 | |
| 11 | #include <linux/module.h> |
Sebastian Ott | f30664e | 2012-08-28 16:50:38 +0200 | [diff] [blame] | 12 | #include <linux/slab.h> |
| 13 | #include <asm/eadm.h> |
| 14 | #include "scm_blk.h" |
| 15 | |
Sebastian Ott | 93481c9 | 2013-02-28 12:07:38 +0100 | [diff] [blame] | 16 | static void scm_notify(struct scm_device *scmdev, enum scm_event event) |
Sebastian Ott | f30664e | 2012-08-28 16:50:38 +0200 | [diff] [blame] | 17 | { |
Sebastian Ott | aebfa66 | 2013-02-28 12:07:55 +0100 | [diff] [blame] | 18 | struct scm_blk_dev *bdev = dev_get_drvdata(&scmdev->dev); |
| 19 | |
Sebastian Ott | 93481c9 | 2013-02-28 12:07:38 +0100 | [diff] [blame] | 20 | switch (event) { |
| 21 | case SCM_CHANGE: |
| 22 | pr_info("%lu: The capabilities of the SCM increment changed\n", |
| 23 | (unsigned long) scmdev->address); |
| 24 | SCM_LOG(2, "State changed"); |
| 25 | SCM_LOG_STATE(2, scmdev); |
| 26 | break; |
Sebastian Ott | aebfa66 | 2013-02-28 12:07:55 +0100 | [diff] [blame] | 27 | case SCM_AVAIL: |
| 28 | SCM_LOG(2, "Increment available"); |
| 29 | SCM_LOG_STATE(2, scmdev); |
| 30 | scm_blk_set_available(bdev); |
| 31 | break; |
Sebastian Ott | 93481c9 | 2013-02-28 12:07:38 +0100 | [diff] [blame] | 32 | } |
Sebastian Ott | f30664e | 2012-08-28 16:50:38 +0200 | [diff] [blame] | 33 | } |
| 34 | |
| 35 | static int scm_probe(struct scm_device *scmdev) |
| 36 | { |
| 37 | struct scm_blk_dev *bdev; |
| 38 | int ret; |
| 39 | |
| 40 | SCM_LOG(2, "probe"); |
| 41 | SCM_LOG_STATE(2, scmdev); |
| 42 | |
| 43 | if (scmdev->attrs.oper_state != OP_STATE_GOOD) |
| 44 | return -EINVAL; |
| 45 | |
| 46 | bdev = kzalloc(sizeof(*bdev), GFP_KERNEL); |
| 47 | if (!bdev) |
| 48 | return -ENOMEM; |
| 49 | |
Sebastian Ott | f30664e | 2012-08-28 16:50:38 +0200 | [diff] [blame] | 50 | dev_set_drvdata(&scmdev->dev, bdev); |
Sebastian Ott | f30664e | 2012-08-28 16:50:38 +0200 | [diff] [blame] | 51 | ret = scm_blk_dev_setup(bdev, scmdev); |
| 52 | if (ret) { |
Sebastian Ott | f30664e | 2012-08-28 16:50:38 +0200 | [diff] [blame] | 53 | dev_set_drvdata(&scmdev->dev, NULL); |
Sebastian Ott | f30664e | 2012-08-28 16:50:38 +0200 | [diff] [blame] | 54 | kfree(bdev); |
| 55 | goto out; |
| 56 | } |
| 57 | |
| 58 | out: |
| 59 | return ret; |
| 60 | } |
| 61 | |
| 62 | static int scm_remove(struct scm_device *scmdev) |
| 63 | { |
Sebastian Ott | c3e6d40 | 2012-09-04 19:36:41 +0200 | [diff] [blame] | 64 | struct scm_blk_dev *bdev = dev_get_drvdata(&scmdev->dev); |
Sebastian Ott | f30664e | 2012-08-28 16:50:38 +0200 | [diff] [blame] | 65 | |
Sebastian Ott | f30664e | 2012-08-28 16:50:38 +0200 | [diff] [blame] | 66 | scm_blk_dev_cleanup(bdev); |
Sebastian Ott | 24996ed | 2012-09-04 19:37:51 +0200 | [diff] [blame] | 67 | dev_set_drvdata(&scmdev->dev, NULL); |
Sebastian Ott | f30664e | 2012-08-28 16:50:38 +0200 | [diff] [blame] | 68 | kfree(bdev); |
| 69 | |
| 70 | return 0; |
| 71 | } |
| 72 | |
| 73 | static struct scm_driver scm_drv = { |
| 74 | .drv = { |
| 75 | .name = "scm_block", |
| 76 | .owner = THIS_MODULE, |
| 77 | }, |
Sebastian Ott | 93481c9 | 2013-02-28 12:07:38 +0100 | [diff] [blame] | 78 | .notify = scm_notify, |
Sebastian Ott | f30664e | 2012-08-28 16:50:38 +0200 | [diff] [blame] | 79 | .probe = scm_probe, |
| 80 | .remove = scm_remove, |
| 81 | .handler = scm_blk_irq, |
| 82 | }; |
| 83 | |
| 84 | int __init scm_drv_init(void) |
| 85 | { |
| 86 | return scm_driver_register(&scm_drv); |
| 87 | } |
| 88 | |
| 89 | void scm_drv_cleanup(void) |
| 90 | { |
| 91 | scm_driver_unregister(&scm_drv); |
| 92 | } |