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