1 /* Copyright (c) 2012, Code Aurora Forum. 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 #include <linux/kernel.h> 14 #include <linux/init.h> 15 #include <linux/module.h> 16 #include <linux/interrupt.h> 17 #include <linux/gpio.h> 18 #include <linux/slab.h> 19 #include <linux/of.h> 20 #include <linux/of_gpio.h> 21 #include <linux/platform_device.h> 22 #include <linux/irq.h> 23 #include <media/rc-core.h> 24 #include <linux/platform_data/media/gpio-ir-recv.h> 25 26 #define GPIO_IR_DRIVER_NAME "gpio-rc-recv" 27 #define GPIO_IR_DEVICE_NAME "gpio_ir_recv" 28 29 struct gpio_rc_dev { 30 struct rc_dev *rcdev; 31 int gpio_nr; 32 bool active_low; 33 struct timer_list flush_timer; 34 }; 35 36 #ifdef CONFIG_OF 37 /* 38 * Translate OpenFirmware node properties into platform_data 39 */ 40 static int gpio_ir_recv_get_devtree_pdata(struct device *dev, 41 struct gpio_ir_recv_platform_data *pdata) 42 { 43 struct device_node *np = dev->of_node; 44 enum of_gpio_flags flags; 45 int gpio; 46 47 gpio = of_get_gpio_flags(np, 0, &flags); 48 if (gpio < 0) { 49 if (gpio != -EPROBE_DEFER) 50 dev_err(dev, "Failed to get gpio flags (%d)\n", gpio); 51 return gpio; 52 } 53 54 pdata->gpio_nr = gpio; 55 pdata->active_low = (flags & OF_GPIO_ACTIVE_LOW); 56 /* probe() takes care of map_name == NULL or allowed_protos == 0 */ 57 pdata->map_name = of_get_property(np, "linux,rc-map-name", NULL); 58 pdata->allowed_protos = 0; 59 60 return 0; 61 } 62 63 static const struct of_device_id gpio_ir_recv_of_match[] = { 64 { .compatible = "gpio-ir-receiver", }, 65 { }, 66 }; 67 MODULE_DEVICE_TABLE(of, gpio_ir_recv_of_match); 68 69 #else /* !CONFIG_OF */ 70 71 #define gpio_ir_recv_get_devtree_pdata(dev, pdata) (-ENOSYS) 72 73 #endif 74 75 static irqreturn_t gpio_ir_recv_irq(int irq, void *dev_id) 76 { 77 struct gpio_rc_dev *gpio_dev = dev_id; 78 int gval; 79 int rc = 0; 80 enum raw_event_type type = IR_SPACE; 81 82 gval = gpio_get_value(gpio_dev->gpio_nr); 83 84 if (gval < 0) 85 goto err_get_value; 86 87 if (gpio_dev->active_low) 88 gval = !gval; 89 90 if (gval == 1) 91 type = IR_PULSE; 92 93 rc = ir_raw_event_store_edge(gpio_dev->rcdev, type); 94 if (rc < 0) 95 goto err_get_value; 96 97 mod_timer(&gpio_dev->flush_timer, 98 jiffies + nsecs_to_jiffies(gpio_dev->rcdev->timeout)); 99 100 ir_raw_event_handle(gpio_dev->rcdev); 101 102 err_get_value: 103 return IRQ_HANDLED; 104 } 105 106 static void flush_timer(unsigned long arg) 107 { 108 struct gpio_rc_dev *gpio_dev = (struct gpio_rc_dev *)arg; 109 DEFINE_IR_RAW_EVENT(ev); 110 111 ev.timeout = true; 112 ev.duration = gpio_dev->rcdev->timeout; 113 ir_raw_event_store(gpio_dev->rcdev, &ev); 114 ir_raw_event_handle(gpio_dev->rcdev); 115 } 116 117 static int gpio_ir_recv_probe(struct platform_device *pdev) 118 { 119 struct gpio_rc_dev *gpio_dev; 120 struct rc_dev *rcdev; 121 const struct gpio_ir_recv_platform_data *pdata = 122 pdev->dev.platform_data; 123 int rc; 124 125 if (pdev->dev.of_node) { 126 struct gpio_ir_recv_platform_data *dtpdata = 127 devm_kzalloc(&pdev->dev, sizeof(*dtpdata), GFP_KERNEL); 128 if (!dtpdata) 129 return -ENOMEM; 130 rc = gpio_ir_recv_get_devtree_pdata(&pdev->dev, dtpdata); 131 if (rc) 132 return rc; 133 pdata = dtpdata; 134 } 135 136 if (!pdata) 137 return -EINVAL; 138 139 if (pdata->gpio_nr < 0) 140 return -EINVAL; 141 142 gpio_dev = kzalloc(sizeof(struct gpio_rc_dev), GFP_KERNEL); 143 if (!gpio_dev) 144 return -ENOMEM; 145 146 rcdev = rc_allocate_device(RC_DRIVER_IR_RAW); 147 if (!rcdev) { 148 rc = -ENOMEM; 149 goto err_allocate_device; 150 } 151 152 rcdev->priv = gpio_dev; 153 rcdev->input_name = GPIO_IR_DEVICE_NAME; 154 rcdev->input_phys = GPIO_IR_DEVICE_NAME "/input0"; 155 rcdev->input_id.bustype = BUS_HOST; 156 rcdev->input_id.vendor = 0x0001; 157 rcdev->input_id.product = 0x0001; 158 rcdev->input_id.version = 0x0100; 159 rcdev->dev.parent = &pdev->dev; 160 rcdev->driver_name = GPIO_IR_DRIVER_NAME; 161 rcdev->min_timeout = 1; 162 rcdev->timeout = IR_DEFAULT_TIMEOUT; 163 rcdev->max_timeout = 10 * IR_DEFAULT_TIMEOUT; 164 if (pdata->allowed_protos) 165 rcdev->allowed_protocols = pdata->allowed_protos; 166 else 167 rcdev->allowed_protocols = RC_BIT_ALL_IR_DECODER; 168 rcdev->map_name = pdata->map_name ?: RC_MAP_EMPTY; 169 170 gpio_dev->rcdev = rcdev; 171 gpio_dev->gpio_nr = pdata->gpio_nr; 172 gpio_dev->active_low = pdata->active_low; 173 174 setup_timer(&gpio_dev->flush_timer, flush_timer, 175 (unsigned long)gpio_dev); 176 177 rc = gpio_request(pdata->gpio_nr, "gpio-ir-recv"); 178 if (rc < 0) 179 goto err_gpio_request; 180 rc = gpio_direction_input(pdata->gpio_nr); 181 if (rc < 0) 182 goto err_gpio_direction_input; 183 184 rc = rc_register_device(rcdev); 185 if (rc < 0) { 186 dev_err(&pdev->dev, "failed to register rc device\n"); 187 goto err_register_rc_device; 188 } 189 190 platform_set_drvdata(pdev, gpio_dev); 191 192 rc = request_any_context_irq(gpio_to_irq(pdata->gpio_nr), 193 gpio_ir_recv_irq, 194 IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING, 195 "gpio-ir-recv-irq", gpio_dev); 196 if (rc < 0) 197 goto err_request_irq; 198 199 return 0; 200 201 err_request_irq: 202 rc_unregister_device(rcdev); 203 rcdev = NULL; 204 err_register_rc_device: 205 err_gpio_direction_input: 206 gpio_free(pdata->gpio_nr); 207 err_gpio_request: 208 rc_free_device(rcdev); 209 err_allocate_device: 210 kfree(gpio_dev); 211 return rc; 212 } 213 214 static int gpio_ir_recv_remove(struct platform_device *pdev) 215 { 216 struct gpio_rc_dev *gpio_dev = platform_get_drvdata(pdev); 217 218 free_irq(gpio_to_irq(gpio_dev->gpio_nr), gpio_dev); 219 del_timer_sync(&gpio_dev->flush_timer); 220 rc_unregister_device(gpio_dev->rcdev); 221 gpio_free(gpio_dev->gpio_nr); 222 kfree(gpio_dev); 223 return 0; 224 } 225 226 #ifdef CONFIG_PM 227 static int gpio_ir_recv_suspend(struct device *dev) 228 { 229 struct platform_device *pdev = to_platform_device(dev); 230 struct gpio_rc_dev *gpio_dev = platform_get_drvdata(pdev); 231 232 if (device_may_wakeup(dev)) 233 enable_irq_wake(gpio_to_irq(gpio_dev->gpio_nr)); 234 else 235 disable_irq(gpio_to_irq(gpio_dev->gpio_nr)); 236 237 return 0; 238 } 239 240 static int gpio_ir_recv_resume(struct device *dev) 241 { 242 struct platform_device *pdev = to_platform_device(dev); 243 struct gpio_rc_dev *gpio_dev = platform_get_drvdata(pdev); 244 245 if (device_may_wakeup(dev)) 246 disable_irq_wake(gpio_to_irq(gpio_dev->gpio_nr)); 247 else 248 enable_irq(gpio_to_irq(gpio_dev->gpio_nr)); 249 250 return 0; 251 } 252 253 static const struct dev_pm_ops gpio_ir_recv_pm_ops = { 254 .suspend = gpio_ir_recv_suspend, 255 .resume = gpio_ir_recv_resume, 256 }; 257 #endif 258 259 static struct platform_driver gpio_ir_recv_driver = { 260 .probe = gpio_ir_recv_probe, 261 .remove = gpio_ir_recv_remove, 262 .driver = { 263 .name = GPIO_IR_DRIVER_NAME, 264 .of_match_table = of_match_ptr(gpio_ir_recv_of_match), 265 #ifdef CONFIG_PM 266 .pm = &gpio_ir_recv_pm_ops, 267 #endif 268 }, 269 }; 270 module_platform_driver(gpio_ir_recv_driver); 271 272 MODULE_DESCRIPTION("GPIO IR Receiver driver"); 273 MODULE_LICENSE("GPL v2"); 274