Graeme Gregory | b1f254e | 2013-05-28 10:50:11 +0900 | [diff] [blame^] | 1 | /* |
| 2 | * Palmas USB transceiver driver |
| 3 | * |
| 4 | * Copyright (C) 2013 Texas Instruments Incorporated - http://www.ti.com |
| 5 | * This program is free software; you can redistribute it and/or modify |
| 6 | * it under the terms of the GNU General Public License as published by |
| 7 | * the Free Software Foundation; either version 2 of the License, or |
| 8 | * (at your option) any later version. |
| 9 | * |
| 10 | * Author: Graeme Gregory <gg@slimlogic.co.uk> |
| 11 | * Author: Kishon Vijay Abraham I <kishon@ti.com> |
| 12 | * |
| 13 | * Based on twl6030_usb.c |
| 14 | * |
| 15 | * Author: Hema HK <hemahk@ti.com> |
| 16 | * |
| 17 | * This program is distributed in the hope that it will be useful, |
| 18 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 20 | * GNU General Public License for more details. |
| 21 | */ |
| 22 | |
| 23 | #include <linux/module.h> |
| 24 | #include <linux/interrupt.h> |
| 25 | #include <linux/platform_device.h> |
| 26 | #include <linux/err.h> |
| 27 | #include <linux/mfd/palmas.h> |
| 28 | #include <linux/of.h> |
| 29 | #include <linux/of_platform.h> |
| 30 | |
| 31 | static const char *palmas_extcon_cable[] = { |
| 32 | [0] = "USB", |
| 33 | [1] = "USB-HOST", |
| 34 | NULL, |
| 35 | }; |
| 36 | |
| 37 | static const int mutually_exclusive[] = {0x3, 0x0}; |
| 38 | |
| 39 | static void palmas_usb_wakeup(struct palmas *palmas, int enable) |
| 40 | { |
| 41 | if (enable) |
| 42 | palmas_write(palmas, PALMAS_USB_OTG_BASE, PALMAS_USB_WAKEUP, |
| 43 | PALMAS_USB_WAKEUP_ID_WK_UP_COMP); |
| 44 | else |
| 45 | palmas_write(palmas, PALMAS_USB_OTG_BASE, PALMAS_USB_WAKEUP, 0); |
| 46 | } |
| 47 | |
| 48 | static irqreturn_t palmas_vbus_irq_handler(int irq, void *_palmas_usb) |
| 49 | { |
| 50 | struct palmas_usb *palmas_usb = _palmas_usb; |
| 51 | unsigned int vbus_line_state; |
| 52 | |
| 53 | palmas_read(palmas_usb->palmas, PALMAS_INTERRUPT_BASE, |
| 54 | PALMAS_INT3_LINE_STATE, &vbus_line_state); |
| 55 | |
| 56 | if (vbus_line_state & PALMAS_INT3_LINE_STATE_VBUS) { |
| 57 | if (palmas_usb->linkstat != PALMAS_USB_STATE_VBUS) { |
| 58 | palmas_usb->linkstat = PALMAS_USB_STATE_VBUS; |
| 59 | extcon_set_cable_state(&palmas_usb->edev, "USB", true); |
| 60 | } else { |
| 61 | dev_dbg(palmas_usb->dev, |
| 62 | "Spurious connect event detected\n"); |
| 63 | } |
| 64 | } else if (!(vbus_line_state & PALMAS_INT3_LINE_STATE_VBUS)) { |
| 65 | if (palmas_usb->linkstat == PALMAS_USB_STATE_VBUS) { |
| 66 | palmas_usb->linkstat = PALMAS_USB_STATE_DISCONNECT; |
| 67 | extcon_set_cable_state(&palmas_usb->edev, "USB", false); |
| 68 | } else { |
| 69 | dev_dbg(palmas_usb->dev, |
| 70 | "Spurious disconnect event detected\n"); |
| 71 | } |
| 72 | } |
| 73 | |
| 74 | return IRQ_HANDLED; |
| 75 | } |
| 76 | |
| 77 | static irqreturn_t palmas_id_irq_handler(int irq, void *_palmas_usb) |
| 78 | { |
| 79 | unsigned int set; |
| 80 | struct palmas_usb *palmas_usb = _palmas_usb; |
| 81 | |
| 82 | palmas_read(palmas_usb->palmas, PALMAS_USB_OTG_BASE, |
| 83 | PALMAS_USB_ID_INT_LATCH_SET, &set); |
| 84 | |
| 85 | if (set & PALMAS_USB_ID_INT_SRC_ID_GND) { |
| 86 | palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE, |
| 87 | PALMAS_USB_ID_INT_EN_HI_SET, |
| 88 | PALMAS_USB_ID_INT_EN_HI_SET_ID_FLOAT); |
| 89 | palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE, |
| 90 | PALMAS_USB_ID_INT_EN_HI_CLR, |
| 91 | PALMAS_USB_ID_INT_EN_HI_CLR_ID_GND); |
| 92 | palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE, |
| 93 | PALMAS_USB_ID_INT_LATCH_CLR, |
| 94 | PALMAS_USB_ID_INT_EN_HI_CLR_ID_GND); |
| 95 | palmas_usb->linkstat = PALMAS_USB_STATE_ID; |
| 96 | extcon_set_cable_state(&palmas_usb->edev, "USB-HOST", true); |
| 97 | } else if (set & PALMAS_USB_ID_INT_SRC_ID_FLOAT) { |
| 98 | palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE, |
| 99 | PALMAS_USB_ID_INT_EN_HI_SET, |
| 100 | PALMAS_USB_ID_INT_EN_HI_SET_ID_GND); |
| 101 | palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE, |
| 102 | PALMAS_USB_ID_INT_EN_HI_CLR, |
| 103 | PALMAS_USB_ID_INT_EN_HI_CLR_ID_FLOAT); |
| 104 | palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE, |
| 105 | PALMAS_USB_ID_INT_LATCH_CLR, |
| 106 | PALMAS_USB_ID_INT_EN_HI_CLR_ID_FLOAT); |
| 107 | palmas_usb->linkstat = PALMAS_USB_STATE_DISCONNECT; |
| 108 | extcon_set_cable_state(&palmas_usb->edev, "USB-HOST", false); |
| 109 | } |
| 110 | |
| 111 | return IRQ_HANDLED; |
| 112 | } |
| 113 | |
| 114 | static void palmas_enable_irq(struct palmas_usb *palmas_usb) |
| 115 | { |
| 116 | palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE, |
| 117 | PALMAS_USB_VBUS_CTRL_SET, |
| 118 | PALMAS_USB_VBUS_CTRL_SET_VBUS_ACT_COMP); |
| 119 | |
| 120 | palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE, |
| 121 | PALMAS_USB_ID_CTRL_SET, PALMAS_USB_ID_CTRL_SET_ID_ACT_COMP); |
| 122 | |
| 123 | palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE, |
| 124 | PALMAS_USB_ID_INT_EN_HI_SET, |
| 125 | PALMAS_USB_ID_INT_EN_HI_SET_ID_GND); |
| 126 | |
| 127 | palmas_vbus_irq_handler(palmas_usb->vbus_irq, palmas_usb); |
| 128 | |
| 129 | /* cold plug for host mode needs this delay */ |
| 130 | msleep(30); |
| 131 | palmas_id_irq_handler(palmas_usb->id_irq, palmas_usb); |
| 132 | } |
| 133 | |
| 134 | static int palmas_usb_probe(struct platform_device *pdev) |
| 135 | { |
| 136 | struct palmas *palmas = dev_get_drvdata(pdev->dev.parent); |
| 137 | struct palmas_usb_platform_data *pdata = pdev->dev.platform_data; |
| 138 | struct device_node *node = pdev->dev.of_node; |
| 139 | struct palmas_usb *palmas_usb; |
| 140 | int status; |
| 141 | |
| 142 | if (node && !pdata) { |
| 143 | pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL); |
| 144 | |
| 145 | if (!pdata) |
| 146 | return -ENOMEM; |
| 147 | |
| 148 | pdata->wakeup = of_property_read_bool(node, "ti,wakeup"); |
| 149 | } else if (!pdata) { |
| 150 | return -EINVAL; |
| 151 | } |
| 152 | |
| 153 | palmas_usb = devm_kzalloc(&pdev->dev, sizeof(*palmas_usb), GFP_KERNEL); |
| 154 | if (!palmas_usb) |
| 155 | return -ENOMEM; |
| 156 | |
| 157 | palmas->usb = palmas_usb; |
| 158 | palmas_usb->palmas = palmas; |
| 159 | |
| 160 | palmas_usb->dev = &pdev->dev; |
| 161 | |
| 162 | palmas_usb->id_otg_irq = regmap_irq_get_virq(palmas->irq_data, |
| 163 | PALMAS_ID_OTG_IRQ); |
| 164 | palmas_usb->id_irq = regmap_irq_get_virq(palmas->irq_data, |
| 165 | PALMAS_ID_IRQ); |
| 166 | palmas_usb->vbus_otg_irq = regmap_irq_get_virq(palmas->irq_data, |
| 167 | PALMAS_VBUS_OTG_IRQ); |
| 168 | palmas_usb->vbus_irq = regmap_irq_get_virq(palmas->irq_data, |
| 169 | PALMAS_VBUS_IRQ); |
| 170 | |
| 171 | palmas_usb_wakeup(palmas, pdata->wakeup); |
| 172 | |
| 173 | platform_set_drvdata(pdev, palmas_usb); |
| 174 | |
| 175 | palmas_usb->edev.name = "palmas-usb"; |
| 176 | palmas_usb->edev.supported_cable = palmas_extcon_cable; |
| 177 | palmas_usb->edev.mutually_exclusive = mutually_exclusive; |
| 178 | |
| 179 | status = extcon_dev_register(&palmas_usb->edev, palmas_usb->dev); |
| 180 | if (status) { |
| 181 | dev_err(&pdev->dev, "failed to register extcon device\n"); |
| 182 | return status; |
| 183 | } |
| 184 | |
| 185 | status = devm_request_threaded_irq(palmas_usb->dev, palmas_usb->id_irq, |
| 186 | NULL, palmas_id_irq_handler, |
| 187 | IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING, |
| 188 | "palmas_usb_id", palmas_usb); |
| 189 | if (status < 0) { |
| 190 | dev_err(&pdev->dev, "can't get IRQ %d, err %d\n", |
| 191 | palmas_usb->id_irq, status); |
| 192 | goto fail_extcon; |
| 193 | } |
| 194 | |
| 195 | status = devm_request_threaded_irq(palmas_usb->dev, |
| 196 | palmas_usb->vbus_irq, NULL, palmas_vbus_irq_handler, |
| 197 | IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING, |
| 198 | "palmas_usb_vbus", palmas_usb); |
| 199 | if (status < 0) { |
| 200 | dev_err(&pdev->dev, "can't get IRQ %d, err %d\n", |
| 201 | palmas_usb->vbus_irq, status); |
| 202 | goto fail_extcon; |
| 203 | } |
| 204 | |
| 205 | palmas_enable_irq(palmas_usb); |
| 206 | |
| 207 | return 0; |
| 208 | |
| 209 | fail_extcon: |
| 210 | extcon_dev_unregister(&palmas_usb->edev); |
| 211 | |
| 212 | return status; |
| 213 | } |
| 214 | |
| 215 | static int palmas_usb_remove(struct platform_device *pdev) |
| 216 | { |
| 217 | struct palmas_usb *palmas_usb = platform_get_drvdata(pdev); |
| 218 | |
| 219 | extcon_dev_unregister(&palmas_usb->edev); |
| 220 | |
| 221 | return 0; |
| 222 | } |
| 223 | |
| 224 | static struct of_device_id of_palmas_match_tbl[] = { |
| 225 | { .compatible = "ti,palmas-usb", }, |
| 226 | { .compatible = "ti,twl6035-usb", }, |
| 227 | { /* end */ } |
| 228 | }; |
| 229 | |
| 230 | static struct platform_driver palmas_usb_driver = { |
| 231 | .probe = palmas_usb_probe, |
| 232 | .remove = palmas_usb_remove, |
| 233 | .driver = { |
| 234 | .name = "palmas-usb", |
| 235 | .of_match_table = of_palmas_match_tbl, |
| 236 | .owner = THIS_MODULE, |
| 237 | }, |
| 238 | }; |
| 239 | |
| 240 | module_platform_driver(palmas_usb_driver); |
| 241 | |
| 242 | MODULE_ALIAS("platform:palmas-usb"); |
| 243 | MODULE_AUTHOR("Graeme Gregory <gg@slimlogic.co.uk>"); |
| 244 | MODULE_DESCRIPTION("Palmas USB transceiver driver"); |
| 245 | MODULE_LICENSE("GPL"); |
| 246 | MODULE_DEVICE_TABLE(of, of_palmas_match_tbl); |