Anirudh Ghayal | bce1892 | 2018-01-10 10:02:47 +0530 | [diff] [blame] | 1 | /* Copyright (c) 2013-2015, 2017-2018, The Linux Foundation. All rights reserved. |
Anirudh Ghayal | 52c7706 | 2018-01-10 08:45:26 +0530 | [diff] [blame] | 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 | #include <linux/module.h> |
| 14 | #include <linux/init.h> |
| 15 | #include <linux/kernel.h> |
| 16 | #include <linux/err.h> |
| 17 | #include <linux/errno.h> |
| 18 | #include <linux/slab.h> |
| 19 | #include <linux/of_platform.h> |
| 20 | #include <linux/interrupt.h> |
| 21 | #include <linux/of_gpio.h> |
| 22 | #include <linux/gpio.h> |
| 23 | #include <linux/extcon.h> |
| 24 | #include <linux/regulator/consumer.h> |
| 25 | |
| 26 | struct gpio_usbdetect { |
| 27 | struct platform_device *pdev; |
| 28 | struct regulator *vin; |
| 29 | int vbus_det_irq; |
| 30 | int id_det_irq; |
| 31 | int gpio; |
| 32 | struct extcon_dev *extcon_dev; |
| 33 | int vbus_state; |
| 34 | bool id_state; |
| 35 | }; |
| 36 | |
| 37 | static const unsigned int gpio_usb_extcon_table[] = { |
| 38 | EXTCON_USB, |
| 39 | EXTCON_USB_HOST, |
Anirudh Ghayal | 52c7706 | 2018-01-10 08:45:26 +0530 | [diff] [blame] | 40 | EXTCON_NONE, |
| 41 | }; |
| 42 | |
| 43 | static irqreturn_t gpio_usbdetect_vbus_irq(int irq, void *data) |
| 44 | { |
| 45 | struct gpio_usbdetect *usb = data; |
Anirudh Ghayal | bce1892 | 2018-01-10 10:02:47 +0530 | [diff] [blame] | 46 | union extcon_property_value val; |
Anirudh Ghayal | 52c7706 | 2018-01-10 08:45:26 +0530 | [diff] [blame] | 47 | |
| 48 | usb->vbus_state = gpio_get_value(usb->gpio); |
| 49 | if (usb->vbus_state) { |
| 50 | dev_dbg(&usb->pdev->dev, "setting vbus notification\n"); |
Anirudh Ghayal | bce1892 | 2018-01-10 10:02:47 +0530 | [diff] [blame] | 51 | val.intval = true; |
| 52 | extcon_set_property(usb->extcon_dev, EXTCON_USB, |
| 53 | EXTCON_PROP_USB_SS, val); |
Anirudh Ghayal | 52c7706 | 2018-01-10 08:45:26 +0530 | [diff] [blame] | 54 | extcon_set_cable_state_(usb->extcon_dev, EXTCON_USB, 1); |
| 55 | } else { |
| 56 | dev_dbg(&usb->pdev->dev, "setting vbus removed notification\n"); |
| 57 | extcon_set_cable_state_(usb->extcon_dev, EXTCON_USB, 0); |
| 58 | } |
| 59 | |
| 60 | return IRQ_HANDLED; |
| 61 | } |
| 62 | |
| 63 | static irqreturn_t gpio_usbdetect_id_irq(int irq, void *data) |
| 64 | { |
| 65 | struct gpio_usbdetect *usb = data; |
| 66 | int ret; |
| 67 | |
| 68 | ret = irq_get_irqchip_state(irq, IRQCHIP_STATE_LINE_LEVEL, |
| 69 | &usb->id_state); |
| 70 | if (ret < 0) { |
| 71 | dev_err(&usb->pdev->dev, "unable to read ID IRQ LINE\n"); |
| 72 | return IRQ_HANDLED; |
| 73 | } |
| 74 | |
| 75 | return IRQ_WAKE_THREAD; |
| 76 | } |
| 77 | |
| 78 | static irqreturn_t gpio_usbdetect_id_irq_thread(int irq, void *data) |
| 79 | { |
| 80 | struct gpio_usbdetect *usb = data; |
| 81 | bool curr_id_state; |
| 82 | static int prev_id_state = -EINVAL; |
Anirudh Ghayal | bce1892 | 2018-01-10 10:02:47 +0530 | [diff] [blame] | 83 | union extcon_property_value val; |
Anirudh Ghayal | 52c7706 | 2018-01-10 08:45:26 +0530 | [diff] [blame] | 84 | |
| 85 | curr_id_state = usb->id_state; |
| 86 | if (curr_id_state == prev_id_state) { |
| 87 | dev_dbg(&usb->pdev->dev, "no change in ID state\n"); |
| 88 | return IRQ_HANDLED; |
| 89 | } |
| 90 | |
| 91 | if (curr_id_state) { |
| 92 | dev_dbg(&usb->pdev->dev, "stopping usb host\n"); |
| 93 | extcon_set_cable_state_(usb->extcon_dev, EXTCON_USB_HOST, 0); |
| 94 | enable_irq(usb->vbus_det_irq); |
| 95 | } else { |
| 96 | dev_dbg(&usb->pdev->dev, "starting usb HOST\n"); |
| 97 | disable_irq(usb->vbus_det_irq); |
Anirudh Ghayal | bce1892 | 2018-01-10 10:02:47 +0530 | [diff] [blame] | 98 | val.intval = true; |
| 99 | extcon_set_property(usb->extcon_dev, EXTCON_USB_HOST, |
| 100 | EXTCON_PROP_USB_SS, val); |
Anirudh Ghayal | 52c7706 | 2018-01-10 08:45:26 +0530 | [diff] [blame] | 101 | extcon_set_cable_state_(usb->extcon_dev, EXTCON_USB_HOST, 1); |
| 102 | } |
| 103 | |
| 104 | prev_id_state = curr_id_state; |
| 105 | return IRQ_HANDLED; |
| 106 | } |
| 107 | |
| 108 | static const u32 gpio_usb_extcon_exclusive[] = {0x3, 0}; |
| 109 | |
| 110 | static int gpio_usbdetect_probe(struct platform_device *pdev) |
| 111 | { |
| 112 | struct gpio_usbdetect *usb; |
| 113 | int rc; |
| 114 | |
| 115 | usb = devm_kzalloc(&pdev->dev, sizeof(*usb), GFP_KERNEL); |
| 116 | if (!usb) |
| 117 | return -ENOMEM; |
| 118 | |
| 119 | usb->pdev = pdev; |
| 120 | |
| 121 | usb->extcon_dev = devm_extcon_dev_allocate(&pdev->dev, |
| 122 | gpio_usb_extcon_table); |
| 123 | if (IS_ERR(usb->extcon_dev)) { |
| 124 | dev_err(&pdev->dev, "failed to allocate a extcon device\n"); |
| 125 | return PTR_ERR(usb->extcon_dev); |
| 126 | } |
| 127 | |
| 128 | usb->extcon_dev->mutually_exclusive = gpio_usb_extcon_exclusive; |
| 129 | rc = devm_extcon_dev_register(&pdev->dev, usb->extcon_dev); |
| 130 | if (rc) { |
| 131 | dev_err(&pdev->dev, "failed to register extcon device\n"); |
| 132 | return rc; |
| 133 | } |
| 134 | |
Anirudh Ghayal | bce1892 | 2018-01-10 10:02:47 +0530 | [diff] [blame] | 135 | rc = extcon_set_property_capability(usb->extcon_dev, |
| 136 | EXTCON_USB, EXTCON_PROP_USB_SS); |
| 137 | rc |= extcon_set_property_capability(usb->extcon_dev, |
| 138 | EXTCON_USB_HOST, EXTCON_PROP_USB_SS); |
| 139 | if (rc) { |
| 140 | dev_err(&pdev->dev, "failed to register extcon props rc=%d\n", |
| 141 | rc); |
| 142 | return rc; |
| 143 | } |
| 144 | |
Anirudh Ghayal | 52c7706 | 2018-01-10 08:45:26 +0530 | [diff] [blame] | 145 | if (of_get_property(pdev->dev.of_node, "vin-supply", NULL)) { |
| 146 | usb->vin = devm_regulator_get(&pdev->dev, "vin"); |
| 147 | if (IS_ERR(usb->vin)) { |
| 148 | dev_err(&pdev->dev, "Failed to get VIN regulator: %ld\n", |
| 149 | PTR_ERR(usb->vin)); |
| 150 | return PTR_ERR(usb->vin); |
| 151 | } |
| 152 | } |
| 153 | |
| 154 | if (usb->vin) { |
| 155 | rc = regulator_enable(usb->vin); |
| 156 | if (rc) { |
| 157 | dev_err(&pdev->dev, "Failed to enable VIN regulator: %d\n", |
| 158 | rc); |
| 159 | return rc; |
| 160 | } |
| 161 | } |
| 162 | |
| 163 | usb->gpio = of_get_named_gpio(pdev->dev.of_node, |
| 164 | "qcom,vbus-det-gpio", 0); |
| 165 | if (usb->gpio < 0) { |
| 166 | dev_err(&pdev->dev, "Failed to get gpio: %d\n", usb->gpio); |
| 167 | rc = usb->gpio; |
| 168 | goto error; |
| 169 | } |
| 170 | |
| 171 | rc = gpio_request(usb->gpio, "vbus-det-gpio"); |
| 172 | if (rc < 0) { |
| 173 | dev_err(&pdev->dev, "Failed to request gpio: %d\n", rc); |
| 174 | goto error; |
| 175 | } |
| 176 | |
| 177 | usb->vbus_det_irq = gpio_to_irq(usb->gpio); |
| 178 | if (usb->vbus_det_irq < 0) { |
| 179 | dev_err(&pdev->dev, "get vbus_det_irq failed\n"); |
| 180 | rc = usb->vbus_det_irq; |
| 181 | goto error; |
| 182 | } |
| 183 | |
| 184 | rc = devm_request_threaded_irq(&pdev->dev, usb->vbus_det_irq, |
| 185 | NULL, gpio_usbdetect_vbus_irq, |
| 186 | IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING | |
| 187 | IRQF_ONESHOT, "vbus_det_irq", usb); |
| 188 | if (rc) { |
| 189 | dev_err(&pdev->dev, "request for vbus_det_irq failed: %d\n", |
| 190 | rc); |
| 191 | goto error; |
| 192 | } |
| 193 | |
| 194 | usb->id_det_irq = platform_get_irq_byname(pdev, "pmic_id_irq"); |
| 195 | if (usb->id_det_irq < 0) { |
| 196 | dev_err(&pdev->dev, "get id_det_irq failed\n"); |
| 197 | rc = usb->id_det_irq; |
| 198 | goto error; |
| 199 | } |
| 200 | |
| 201 | rc = devm_request_threaded_irq(&pdev->dev, usb->id_det_irq, |
| 202 | gpio_usbdetect_id_irq, |
| 203 | gpio_usbdetect_id_irq_thread, |
| 204 | IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING | |
| 205 | IRQF_ONESHOT, "id_det_irq", usb); |
| 206 | if (rc) { |
| 207 | dev_err(&pdev->dev, "request for id_det_irq failed: %d\n", rc); |
| 208 | goto error; |
| 209 | } |
| 210 | |
| 211 | enable_irq_wake(usb->vbus_det_irq); |
| 212 | enable_irq_wake(usb->id_det_irq); |
| 213 | dev_set_drvdata(&pdev->dev, usb); |
| 214 | |
| 215 | if (usb->id_det_irq) { |
| 216 | gpio_usbdetect_id_irq(usb->id_det_irq, usb); |
| 217 | if (!usb->id_state) { |
| 218 | gpio_usbdetect_id_irq_thread(usb->id_det_irq, usb); |
| 219 | return 0; |
| 220 | } |
| 221 | } |
| 222 | |
| 223 | /* Read and report initial VBUS state */ |
| 224 | gpio_usbdetect_vbus_irq(usb->vbus_det_irq, usb); |
| 225 | |
| 226 | return 0; |
| 227 | |
| 228 | error: |
| 229 | if (usb->vin) |
| 230 | regulator_disable(usb->vin); |
| 231 | return rc; |
| 232 | } |
| 233 | |
| 234 | static int gpio_usbdetect_remove(struct platform_device *pdev) |
| 235 | { |
| 236 | struct gpio_usbdetect *usb = dev_get_drvdata(&pdev->dev); |
| 237 | |
| 238 | disable_irq_wake(usb->vbus_det_irq); |
| 239 | disable_irq(usb->vbus_det_irq); |
| 240 | disable_irq_wake(usb->id_det_irq); |
| 241 | disable_irq(usb->id_det_irq); |
| 242 | if (usb->vin) |
| 243 | regulator_disable(usb->vin); |
| 244 | |
| 245 | return 0; |
| 246 | } |
| 247 | |
| 248 | static const struct of_device_id of_match_table[] = { |
| 249 | { .compatible = "qcom,gpio-usbdetect", }, |
| 250 | {} |
| 251 | }; |
| 252 | |
| 253 | static struct platform_driver gpio_usbdetect_driver = { |
| 254 | .driver = { |
| 255 | .name = "qcom,gpio-usbdetect", |
| 256 | .of_match_table = of_match_table, |
| 257 | }, |
| 258 | .probe = gpio_usbdetect_probe, |
| 259 | .remove = gpio_usbdetect_remove, |
| 260 | }; |
| 261 | |
| 262 | module_driver(gpio_usbdetect_driver, platform_driver_register, |
| 263 | platform_driver_unregister); |
| 264 | |
| 265 | MODULE_DESCRIPTION("GPIO USB VBUS Detection driver"); |
| 266 | MODULE_LICENSE("GPL v2"); |