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 return dev_err_probe(dev, PTR_ERR(gpio_dev->gpiod), 79 "error getting gpio\n"); 80 gpio_dev->irq = gpiod_to_irq(gpio_dev->gpiod); 81 if (gpio_dev->irq < 0) 82 return gpio_dev->irq; 83 84 rcdev = devm_rc_allocate_device(dev, RC_DRIVER_IR_RAW); 85 if (!rcdev) 86 return -ENOMEM; 87 88 rcdev->priv = gpio_dev; 89 rcdev->device_name = GPIO_IR_DEVICE_NAME; 90 rcdev->input_phys = GPIO_IR_DEVICE_NAME "/input0"; 91 rcdev->input_id.bustype = BUS_HOST; 92 rcdev->input_id.vendor = 0x0001; 93 rcdev->input_id.product = 0x0001; 94 rcdev->input_id.version = 0x0100; 95 rcdev->dev.parent = dev; 96 rcdev->driver_name = KBUILD_MODNAME; 97 rcdev->min_timeout = 1; 98 rcdev->timeout = IR_DEFAULT_TIMEOUT; 99 rcdev->max_timeout = 10 * IR_DEFAULT_TIMEOUT; 100 rcdev->allowed_protocols = RC_PROTO_BIT_ALL_IR_DECODER; 101 rcdev->map_name = of_get_property(np, "linux,rc-map-name", NULL); 102 if (!rcdev->map_name) 103 rcdev->map_name = RC_MAP_EMPTY; 104 105 gpio_dev->rcdev = rcdev; 106 if (of_property_read_bool(np, "wakeup-source")) 107 device_init_wakeup(dev, true); 108 109 rc = devm_rc_register_device(dev, rcdev); 110 if (rc < 0) { 111 dev_err(dev, "failed to register rc device (%d)\n", rc); 112 return rc; 113 } 114 115 of_property_read_u32(np, "linux,autosuspend-period", &period); 116 if (period) { 117 gpio_dev->pmdev = dev; 118 pm_runtime_set_autosuspend_delay(dev, period); 119 pm_runtime_use_autosuspend(dev); 120 pm_runtime_set_suspended(dev); 121 pm_runtime_enable(dev); 122 } 123 124 platform_set_drvdata(pdev, gpio_dev); 125 126 return devm_request_irq(dev, gpio_dev->irq, gpio_ir_recv_irq, 127 IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING, 128 "gpio-ir-recv-irq", gpio_dev); 129 } 130 131 static void gpio_ir_recv_remove(struct platform_device *pdev) 132 { 133 struct gpio_rc_dev *gpio_dev = platform_get_drvdata(pdev); 134 struct device *pmdev = gpio_dev->pmdev; 135 136 if (pmdev) { 137 pm_runtime_get_sync(pmdev); 138 cpu_latency_qos_remove_request(&gpio_dev->qos); 139 140 pm_runtime_disable(pmdev); 141 pm_runtime_put_noidle(pmdev); 142 pm_runtime_set_suspended(pmdev); 143 } 144 } 145 146 #ifdef CONFIG_PM 147 static int gpio_ir_recv_suspend(struct device *dev) 148 { 149 struct gpio_rc_dev *gpio_dev = dev_get_drvdata(dev); 150 151 if (device_may_wakeup(dev)) 152 enable_irq_wake(gpio_dev->irq); 153 else 154 disable_irq(gpio_dev->irq); 155 156 return 0; 157 } 158 159 static int gpio_ir_recv_resume(struct device *dev) 160 { 161 struct gpio_rc_dev *gpio_dev = dev_get_drvdata(dev); 162 163 if (device_may_wakeup(dev)) 164 disable_irq_wake(gpio_dev->irq); 165 else 166 enable_irq(gpio_dev->irq); 167 168 return 0; 169 } 170 171 static int gpio_ir_recv_runtime_suspend(struct device *dev) 172 { 173 struct gpio_rc_dev *gpio_dev = dev_get_drvdata(dev); 174 175 cpu_latency_qos_remove_request(&gpio_dev->qos); 176 177 return 0; 178 } 179 180 static int gpio_ir_recv_runtime_resume(struct device *dev) 181 { 182 struct gpio_rc_dev *gpio_dev = dev_get_drvdata(dev); 183 184 cpu_latency_qos_add_request(&gpio_dev->qos, 0); 185 186 return 0; 187 } 188 189 static const struct dev_pm_ops gpio_ir_recv_pm_ops = { 190 .suspend = gpio_ir_recv_suspend, 191 .resume = gpio_ir_recv_resume, 192 .runtime_suspend = gpio_ir_recv_runtime_suspend, 193 .runtime_resume = gpio_ir_recv_runtime_resume, 194 }; 195 #endif 196 197 static const struct of_device_id gpio_ir_recv_of_match[] = { 198 { .compatible = "gpio-ir-receiver", }, 199 { }, 200 }; 201 MODULE_DEVICE_TABLE(of, gpio_ir_recv_of_match); 202 203 static struct platform_driver gpio_ir_recv_driver = { 204 .probe = gpio_ir_recv_probe, 205 .remove_new = gpio_ir_recv_remove, 206 .driver = { 207 .name = KBUILD_MODNAME, 208 .of_match_table = gpio_ir_recv_of_match, 209 #ifdef CONFIG_PM 210 .pm = &gpio_ir_recv_pm_ops, 211 #endif 212 }, 213 }; 214 module_platform_driver(gpio_ir_recv_driver); 215 216 MODULE_DESCRIPTION("GPIO IR Receiver driver"); 217 MODULE_LICENSE("GPL v2"); 218