1 // SPDX-License-Identifier: GPL-2.0-only 2 /* Copyright (c) 2012, Code Aurora Forum. All rights reserved. 3 */ 4 5 #include <linux/kernel.h> 6 #include <linux/init.h> 7 #include <linux/module.h> 8 #include <linux/interrupt.h> 9 #include <linux/gpio/consumer.h> 10 #include <linux/slab.h> 11 #include <linux/of.h> 12 #include <linux/platform_device.h> 13 #include <linux/pm_runtime.h> 14 #include <linux/pm_qos.h> 15 #include <linux/irq.h> 16 #include <media/rc-core.h> 17 18 #define GPIO_IR_DEVICE_NAME "gpio_ir_recv" 19 20 struct gpio_rc_dev { 21 struct rc_dev *rcdev; 22 struct gpio_desc *gpiod; 23 int irq; 24 struct device *pmdev; 25 struct pm_qos_request qos; 26 }; 27 28 static irqreturn_t gpio_ir_recv_irq(int irq, void *dev_id) 29 { 30 int val; 31 struct gpio_rc_dev *gpio_dev = dev_id; 32 struct device *pmdev = gpio_dev->pmdev; 33 34 /* 35 * For some cpuidle systems, not all: 36 * Respond to interrupt taking more latency when cpu in idle. 37 * Invoke asynchronous pm runtime get from interrupt context, 38 * this may introduce a millisecond delay to call resume callback, 39 * where to disable cpuilde. 40 * 41 * Two issues lead to fail to decode first frame, one is latency to 42 * respond to interrupt, another is delay introduced by async api. 43 */ 44 if (pmdev) 45 pm_runtime_get(pmdev); 46 47 val = gpiod_get_value(gpio_dev->gpiod); 48 if (val >= 0) 49 ir_raw_event_store_edge(gpio_dev->rcdev, val == 1); 50 51 if (pmdev) 52 pm_runtime_put_autosuspend(pmdev); 53 54 return IRQ_HANDLED; 55 } 56 57 static int gpio_ir_recv_probe(struct platform_device *pdev) 58 { 59 struct device *dev = &pdev->dev; 60 struct device_node *np = dev->of_node; 61 struct gpio_rc_dev *gpio_dev; 62 struct rc_dev *rcdev; 63 u32 period = 0; 64 int rc; 65 66 if (!np) 67 return -ENODEV; 68 69 gpio_dev = devm_kzalloc(dev, sizeof(*gpio_dev), GFP_KERNEL); 70 if (!gpio_dev) 71 return -ENOMEM; 72 73 gpio_dev->gpiod = devm_gpiod_get(dev, NULL, GPIOD_IN); 74 if (IS_ERR(gpio_dev->gpiod)) 75 return dev_err_probe(dev, PTR_ERR(gpio_dev->gpiod), 76 "error getting gpio\n"); 77 gpio_dev->irq = gpiod_to_irq(gpio_dev->gpiod); 78 if (gpio_dev->irq < 0) 79 return gpio_dev->irq; 80 81 rcdev = devm_rc_allocate_device(dev, RC_DRIVER_IR_RAW); 82 if (!rcdev) 83 return -ENOMEM; 84 85 rcdev->priv = gpio_dev; 86 rcdev->device_name = GPIO_IR_DEVICE_NAME; 87 rcdev->input_phys = GPIO_IR_DEVICE_NAME "/input0"; 88 rcdev->input_id.bustype = BUS_HOST; 89 rcdev->input_id.vendor = 0x0001; 90 rcdev->input_id.product = 0x0001; 91 rcdev->input_id.version = 0x0100; 92 rcdev->dev.parent = dev; 93 rcdev->driver_name = KBUILD_MODNAME; 94 rcdev->min_timeout = 1; 95 rcdev->timeout = IR_DEFAULT_TIMEOUT; 96 rcdev->max_timeout = 10 * IR_DEFAULT_TIMEOUT; 97 rcdev->allowed_protocols = RC_PROTO_BIT_ALL_IR_DECODER; 98 rcdev->map_name = of_get_property(np, "linux,rc-map-name", NULL); 99 if (!rcdev->map_name) 100 rcdev->map_name = RC_MAP_EMPTY; 101 102 gpio_dev->rcdev = rcdev; 103 if (of_property_read_bool(np, "wakeup-source")) 104 device_init_wakeup(dev, true); 105 106 rc = devm_rc_register_device(dev, rcdev); 107 if (rc < 0) { 108 dev_err(dev, "failed to register rc device (%d)\n", rc); 109 return rc; 110 } 111 112 of_property_read_u32(np, "linux,autosuspend-period", &period); 113 if (period) { 114 gpio_dev->pmdev = dev; 115 pm_runtime_set_autosuspend_delay(dev, period); 116 pm_runtime_use_autosuspend(dev); 117 pm_runtime_set_suspended(dev); 118 pm_runtime_enable(dev); 119 } 120 121 platform_set_drvdata(pdev, gpio_dev); 122 123 return devm_request_irq(dev, gpio_dev->irq, gpio_ir_recv_irq, 124 IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING, 125 "gpio-ir-recv-irq", gpio_dev); 126 } 127 128 static void gpio_ir_recv_remove(struct platform_device *pdev) 129 { 130 struct gpio_rc_dev *gpio_dev = platform_get_drvdata(pdev); 131 struct device *pmdev = gpio_dev->pmdev; 132 133 if (pmdev) { 134 pm_runtime_get_sync(pmdev); 135 cpu_latency_qos_remove_request(&gpio_dev->qos); 136 137 pm_runtime_disable(pmdev); 138 pm_runtime_put_noidle(pmdev); 139 pm_runtime_set_suspended(pmdev); 140 } 141 } 142 143 #ifdef CONFIG_PM 144 static int gpio_ir_recv_suspend(struct device *dev) 145 { 146 struct gpio_rc_dev *gpio_dev = dev_get_drvdata(dev); 147 148 if (device_may_wakeup(dev)) 149 enable_irq_wake(gpio_dev->irq); 150 else 151 disable_irq(gpio_dev->irq); 152 153 return 0; 154 } 155 156 static int gpio_ir_recv_resume(struct device *dev) 157 { 158 struct gpio_rc_dev *gpio_dev = dev_get_drvdata(dev); 159 160 if (device_may_wakeup(dev)) 161 disable_irq_wake(gpio_dev->irq); 162 else 163 enable_irq(gpio_dev->irq); 164 165 return 0; 166 } 167 168 static int gpio_ir_recv_runtime_suspend(struct device *dev) 169 { 170 struct gpio_rc_dev *gpio_dev = dev_get_drvdata(dev); 171 172 cpu_latency_qos_remove_request(&gpio_dev->qos); 173 174 return 0; 175 } 176 177 static int gpio_ir_recv_runtime_resume(struct device *dev) 178 { 179 struct gpio_rc_dev *gpio_dev = dev_get_drvdata(dev); 180 181 cpu_latency_qos_add_request(&gpio_dev->qos, 0); 182 183 return 0; 184 } 185 186 static const struct dev_pm_ops gpio_ir_recv_pm_ops = { 187 .suspend = gpio_ir_recv_suspend, 188 .resume = gpio_ir_recv_resume, 189 .runtime_suspend = gpio_ir_recv_runtime_suspend, 190 .runtime_resume = gpio_ir_recv_runtime_resume, 191 }; 192 #endif 193 194 static const struct of_device_id gpio_ir_recv_of_match[] = { 195 { .compatible = "gpio-ir-receiver", }, 196 { }, 197 }; 198 MODULE_DEVICE_TABLE(of, gpio_ir_recv_of_match); 199 200 static struct platform_driver gpio_ir_recv_driver = { 201 .probe = gpio_ir_recv_probe, 202 .remove = gpio_ir_recv_remove, 203 .driver = { 204 .name = KBUILD_MODNAME, 205 .of_match_table = gpio_ir_recv_of_match, 206 #ifdef CONFIG_PM 207 .pm = &gpio_ir_recv_pm_ops, 208 #endif 209 }, 210 }; 211 module_platform_driver(gpio_ir_recv_driver); 212 213 MODULE_DESCRIPTION("GPIO IR Receiver driver"); 214 MODULE_LICENSE("GPL v2"); 215