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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 | /* * OMAP OTG controller driver * * Based on code from tahvo-usb.c and isp1301_omap.c drivers. * * Copyright (C) 2005-2006 Nokia Corporation * Copyright (C) 2004 Texas Instruments * Copyright (C) 2004 David Brownell * * This file is subject to the terms and conditions of the GNU General * Public License. See the file "COPYING" in the main directory of this * archive for more details. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. */ #include <linux/io.h> #include <linux/err.h> #include <linux/extcon.h> #include <linux/kernel.h> #include <linux/module.h> #include <linux/interrupt.h> #include <linux/platform_device.h> #include <linux/platform_data/usb-omap1.h> struct otg_device { void __iomem *base; bool id; bool vbus; struct extcon_dev *extcon; struct notifier_block vbus_nb; struct notifier_block id_nb; }; #define OMAP_OTG_CTRL 0x0c #define OMAP_OTG_ASESSVLD (1 << 20) #define OMAP_OTG_BSESSEND (1 << 19) #define OMAP_OTG_BSESSVLD (1 << 18) #define OMAP_OTG_VBUSVLD (1 << 17) #define OMAP_OTG_ID (1 << 16) #define OMAP_OTG_XCEIV_OUTPUTS \ (OMAP_OTG_ASESSVLD | OMAP_OTG_BSESSEND | OMAP_OTG_BSESSVLD | \ OMAP_OTG_VBUSVLD | OMAP_OTG_ID) static void omap_otg_ctrl(struct otg_device *otg_dev, u32 outputs) { u32 l; l = readl(otg_dev->base + OMAP_OTG_CTRL); l &= ~OMAP_OTG_XCEIV_OUTPUTS; l |= outputs; writel(l, otg_dev->base + OMAP_OTG_CTRL); } static void omap_otg_set_mode(struct otg_device *otg_dev) { if (!otg_dev->id && otg_dev->vbus) /* Set B-session valid. */ omap_otg_ctrl(otg_dev, OMAP_OTG_ID | OMAP_OTG_BSESSVLD); else if (otg_dev->vbus) /* Set A-session valid. */ omap_otg_ctrl(otg_dev, OMAP_OTG_ASESSVLD); else if (!otg_dev->id) /* Set B-session end to indicate no VBUS. */ omap_otg_ctrl(otg_dev, OMAP_OTG_ID | OMAP_OTG_BSESSEND); } static int omap_otg_id_notifier(struct notifier_block *nb, unsigned long event, void *ptr) { struct otg_device *otg_dev = container_of(nb, struct otg_device, id_nb); otg_dev->id = event; omap_otg_set_mode(otg_dev); return NOTIFY_DONE; } static int omap_otg_vbus_notifier(struct notifier_block *nb, unsigned long event, void *ptr) { struct otg_device *otg_dev = container_of(nb, struct otg_device, vbus_nb); otg_dev->vbus = event; omap_otg_set_mode(otg_dev); return NOTIFY_DONE; } static int omap_otg_probe(struct platform_device *pdev) { const struct omap_usb_config *config = pdev->dev.platform_data; struct otg_device *otg_dev; struct extcon_dev *extcon; int ret; u32 rev; if (!config || !config->extcon) return -ENODEV; extcon = extcon_get_extcon_dev(config->extcon); if (!extcon) return -EPROBE_DEFER; otg_dev = devm_kzalloc(&pdev->dev, sizeof(*otg_dev), GFP_KERNEL); if (!otg_dev) return -ENOMEM; otg_dev->base = devm_ioremap_resource(&pdev->dev, &pdev->resource[0]); if (IS_ERR(otg_dev->base)) return PTR_ERR(otg_dev->base); otg_dev->extcon = extcon; otg_dev->id_nb.notifier_call = omap_otg_id_notifier; otg_dev->vbus_nb.notifier_call = omap_otg_vbus_notifier; ret = extcon_register_notifier(extcon, EXTCON_USB_HOST, &otg_dev->id_nb); if (ret) return ret; ret = extcon_register_notifier(extcon, EXTCON_USB, &otg_dev->vbus_nb); if (ret) { extcon_unregister_notifier(extcon, EXTCON_USB_HOST, &otg_dev->id_nb); return ret; } otg_dev->id = extcon_get_cable_state_(extcon, EXTCON_USB_HOST); otg_dev->vbus = extcon_get_cable_state_(extcon, EXTCON_USB); omap_otg_set_mode(otg_dev); rev = readl(otg_dev->base); dev_info(&pdev->dev, "OMAP USB OTG controller rev %d.%d (%s, id=%d, vbus=%d)\n", (rev >> 4) & 0xf, rev & 0xf, config->extcon, otg_dev->id, otg_dev->vbus); return 0; } static int omap_otg_remove(struct platform_device *pdev) { struct otg_device *otg_dev = platform_get_drvdata(pdev); struct extcon_dev *edev = otg_dev->extcon; extcon_unregister_notifier(edev, EXTCON_USB_HOST,&otg_dev->id_nb); extcon_unregister_notifier(edev, EXTCON_USB, &otg_dev->vbus_nb); return 0; } static struct platform_driver omap_otg_driver = { .probe = omap_otg_probe, .remove = omap_otg_remove, .driver = { .name = "omap_otg", }, }; module_platform_driver(omap_otg_driver); MODULE_DESCRIPTION("OMAP USB OTG controller driver"); MODULE_LICENSE("GPL"); MODULE_AUTHOR("Aaro Koskinen <aaro.koskinen@iki.fi>"); |