Ajay Kumar Gupta | f6d92a0 | 2009-02-06 17:32:35 +0530 | [diff] [blame] | 1 | /* |
| 2 | * drivers/usb/otg/nop-usb-xceiv.c |
| 3 | * |
| 4 | * NOP USB transceiver for all USB transceiver which are either built-in |
| 5 | * into USB IP or which are mostly autonomous. |
| 6 | * |
| 7 | * Copyright (C) 2009 Texas Instruments Inc |
| 8 | * Author: Ajay Kumar Gupta <ajay.gupta@ti.com> |
| 9 | * |
| 10 | * This program is free software; you can redistribute it and/or modify |
| 11 | * it under the terms of the GNU General Public License as published by |
| 12 | * the Free Software Foundation; either version 2 of the License, or |
| 13 | * (at your option) any later version. |
| 14 | * |
| 15 | * This program is distributed in the hope that it will be useful, |
| 16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 18 | * GNU General Public License for more details. |
| 19 | * |
| 20 | * You should have received a copy of the GNU General Public License |
| 21 | * along with this program; if not, write to the Free Software |
| 22 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
| 23 | * |
| 24 | * Current status: |
| 25 | * this is to add "nop" transceiver for all those phy which is |
| 26 | * autonomous such as isp1504 etc. |
| 27 | */ |
| 28 | |
| 29 | #include <linux/module.h> |
| 30 | #include <linux/platform_device.h> |
| 31 | #include <linux/dma-mapping.h> |
| 32 | #include <linux/usb/otg.h> |
| 33 | |
| 34 | struct nop_usb_xceiv { |
| 35 | struct otg_transceiver otg; |
| 36 | struct device *dev; |
| 37 | }; |
| 38 | |
| 39 | static u64 nop_xceiv_dmamask = DMA_32BIT_MASK; |
| 40 | |
| 41 | static struct platform_device nop_xceiv_device = { |
| 42 | .name = "nop_usb_xceiv", |
| 43 | .id = -1, |
| 44 | .dev = { |
| 45 | .dma_mask = &nop_xceiv_dmamask, |
| 46 | .coherent_dma_mask = DMA_32BIT_MASK, |
| 47 | .platform_data = NULL, |
| 48 | }, |
| 49 | }; |
| 50 | |
| 51 | void usb_nop_xceiv_register(void) |
| 52 | { |
| 53 | if (platform_device_register(&nop_xceiv_device) < 0) { |
| 54 | printk(KERN_ERR "Unable to register usb nop transceiver\n"); |
| 55 | return; |
| 56 | } |
| 57 | } |
| 58 | |
| 59 | void usb_nop_xceiv_unregister(void) |
| 60 | { |
| 61 | platform_device_unregister(&nop_xceiv_device); |
| 62 | } |
| 63 | |
| 64 | static inline struct nop_usb_xceiv *xceiv_to_nop(struct otg_transceiver *x) |
| 65 | { |
| 66 | return container_of(x, struct nop_usb_xceiv, otg); |
| 67 | } |
| 68 | |
| 69 | static int nop_set_suspend(struct otg_transceiver *x, int suspend) |
| 70 | { |
| 71 | return 0; |
| 72 | } |
| 73 | |
| 74 | static int nop_set_peripheral(struct otg_transceiver *x, |
| 75 | struct usb_gadget *gadget) |
| 76 | { |
| 77 | struct nop_usb_xceiv *nop; |
| 78 | |
| 79 | if (!x) |
| 80 | return -ENODEV; |
| 81 | |
| 82 | nop = xceiv_to_nop(x); |
| 83 | |
| 84 | if (!gadget) { |
| 85 | nop->otg.gadget = NULL; |
| 86 | return -ENODEV; |
| 87 | } |
| 88 | |
| 89 | nop->otg.gadget = gadget; |
| 90 | nop->otg.state = OTG_STATE_B_IDLE; |
| 91 | return 0; |
| 92 | } |
| 93 | |
| 94 | static int nop_set_host(struct otg_transceiver *x, struct usb_bus *host) |
| 95 | { |
| 96 | struct nop_usb_xceiv *nop; |
| 97 | |
| 98 | if (!x) |
| 99 | return -ENODEV; |
| 100 | |
| 101 | nop = xceiv_to_nop(x); |
| 102 | |
| 103 | if (!host) { |
| 104 | nop->otg.host = NULL; |
| 105 | return -ENODEV; |
| 106 | } |
| 107 | |
| 108 | nop->otg.host = host; |
| 109 | return 0; |
| 110 | } |
| 111 | |
| 112 | static int __devinit nop_usb_xceiv_probe(struct platform_device *pdev) |
| 113 | { |
| 114 | struct nop_usb_xceiv *nop; |
| 115 | int err; |
| 116 | |
| 117 | nop = kzalloc(sizeof *nop, GFP_KERNEL); |
| 118 | if (!nop) |
| 119 | return -ENOMEM; |
| 120 | |
| 121 | nop->dev = &pdev->dev; |
| 122 | nop->otg.dev = nop->dev; |
| 123 | nop->otg.label = "nop-xceiv"; |
| 124 | nop->otg.state = OTG_STATE_UNDEFINED; |
| 125 | nop->otg.set_host = nop_set_host; |
| 126 | nop->otg.set_peripheral = nop_set_peripheral; |
| 127 | nop->otg.set_suspend = nop_set_suspend; |
| 128 | |
| 129 | err = otg_set_transceiver(&nop->otg); |
| 130 | if (err) { |
| 131 | dev_err(&pdev->dev, "can't register transceiver, err: %d\n", |
| 132 | err); |
| 133 | goto exit; |
| 134 | } |
| 135 | |
| 136 | platform_set_drvdata(pdev, nop); |
| 137 | |
| 138 | return 0; |
| 139 | exit: |
| 140 | kfree(nop); |
| 141 | return err; |
| 142 | } |
| 143 | |
| 144 | static int __devexit nop_usb_xceiv_remove(struct platform_device *pdev) |
| 145 | { |
| 146 | struct nop_usb_xceiv *nop = platform_get_drvdata(pdev); |
| 147 | |
| 148 | otg_set_transceiver(NULL); |
| 149 | |
| 150 | platform_set_drvdata(pdev, NULL); |
| 151 | kfree(nop); |
| 152 | |
| 153 | return 0; |
| 154 | } |
| 155 | |
| 156 | static struct platform_driver nop_usb_xceiv_driver = { |
| 157 | .probe = nop_usb_xceiv_probe, |
| 158 | .remove = __devexit_p(nop_usb_xceiv_remove), |
| 159 | .driver = { |
| 160 | .name = "nop_usb_xceiv", |
| 161 | .owner = THIS_MODULE, |
| 162 | }, |
| 163 | }; |
| 164 | |
| 165 | static int __init nop_usb_xceiv_init(void) |
| 166 | { |
| 167 | return platform_driver_register(&nop_usb_xceiv_driver); |
| 168 | } |
| 169 | subsys_initcall(nop_usb_xceiv_init); |
| 170 | |
| 171 | static void __exit nop_usb_xceiv_exit(void) |
| 172 | { |
| 173 | platform_driver_unregister(&nop_usb_xceiv_driver); |
| 174 | } |
| 175 | module_exit(nop_usb_xceiv_exit); |
| 176 | |
| 177 | MODULE_ALIAS("platform:nop_usb_xceiv"); |
| 178 | MODULE_AUTHOR("Texas Instruments Inc"); |
| 179 | MODULE_DESCRIPTION("NOP USB Transceiver driver"); |
| 180 | MODULE_LICENSE("GPL"); |