| Pratibhasagar V | 52fa282 | 2013-11-06 12:16:28 +0530 | [diff] [blame] | 1 | /* Copyright (c) 2013, The Linux Foundation. All rights reserved. |
| 2 | * |
| 3 | * This program is free software; you can redistribute it and/or modify |
| 4 | * it under the terms of the GNU General Public License version 2 and |
| 5 | * only version 2 as published by the Free Software Foundation. |
| 6 | * |
| 7 | * This program is distributed in the hope that it will be useful, |
| 8 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 9 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 10 | * GNU General Public License for more details. |
| 11 | */ |
| 12 | |
| 13 | #define pr_fmt(fmt) "%s: " fmt, __func__ |
| 14 | |
| 15 | #include <linux/uio_driver.h> |
| 16 | #include <linux/module.h> |
| 17 | #include <linux/platform_device.h> |
| 18 | #include <linux/err.h> |
| 19 | |
| 20 | #define DRIVER_NAME "msm_sharedmem" |
| 21 | |
| 22 | static int msm_sharedmem_probe(struct platform_device *pdev) |
| 23 | { |
| 24 | int ret = 0; |
| 25 | struct uio_info *info = NULL; |
| 26 | struct resource *clnt_res = NULL; |
| 27 | |
| 28 | /* Get the addresses from platform-data */ |
| 29 | if (!pdev->dev.of_node) { |
| 30 | pr_err("Node not found\n"); |
| 31 | ret = -ENODEV; |
| 32 | goto out; |
| 33 | } |
| 34 | clnt_res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
| 35 | if (!clnt_res) { |
| 36 | pr_err("resource not found\n"); |
| 37 | return -ENODEV; |
| 38 | } |
| 39 | |
| 40 | info = devm_kzalloc(&pdev->dev, sizeof(struct uio_info), GFP_KERNEL); |
| 41 | if (!info) |
| 42 | return -ENOMEM; |
| 43 | |
| 44 | info->name = clnt_res->name; |
| 45 | info->version = "1.0"; |
| 46 | info->mem[0].addr = clnt_res->start; |
| 47 | info->mem[0].size = resource_size(clnt_res); |
| 48 | info->mem[0].memtype = UIO_MEM_PHYS; |
| 49 | |
| 50 | /* Setup device */ |
| 51 | ret = uio_register_device(&pdev->dev, info); |
| 52 | if (ret) |
| 53 | goto out; |
| 54 | |
| 55 | dev_set_drvdata(&pdev->dev, info); |
| 56 | pr_debug("Device created for client '%s'\n", clnt_res->name); |
| 57 | out: |
| 58 | return ret; |
| 59 | } |
| 60 | |
| 61 | static int msm_sharedmem_remove(struct platform_device *pdev) |
| 62 | { |
| 63 | struct uio_info *info = dev_get_drvdata(&pdev->dev); |
| 64 | |
| 65 | uio_unregister_device(info); |
| 66 | |
| 67 | return 0; |
| 68 | } |
| 69 | |
| 70 | static struct of_device_id msm_sharedmem_of_match[] = { |
| 71 | {.compatible = "qcom,sharedmem-uio",}, |
| 72 | {}, |
| 73 | }; |
| 74 | MODULE_DEVICE_TABLE(of, msm_sharedmem_of_match); |
| 75 | |
| 76 | static struct platform_driver msm_sharedmem_driver = { |
| 77 | .probe = msm_sharedmem_probe, |
| 78 | .remove = msm_sharedmem_remove, |
| 79 | .driver = { |
| 80 | .name = DRIVER_NAME, |
| 81 | .owner = THIS_MODULE, |
| 82 | .of_match_table = msm_sharedmem_of_match, |
| 83 | }, |
| 84 | }; |
| 85 | |
| 86 | module_platform_driver(msm_sharedmem_driver); |
| 87 | MODULE_LICENSE("GPL v2"); |