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_mark_last_busy(pmdev); 53 pm_runtime_put_autosuspend(pmdev); 54 } 55 56 return IRQ_HANDLED; 57 } 58 59 static int gpio_ir_recv_probe(struct platform_device *pdev) 60 { 61 struct device *dev = &pdev->dev; 62 struct device_node *np = dev->of_node; 63 struct gpio_rc_dev *gpio_dev; 64 struct rc_dev *rcdev; 65 u32 period = 0; 66 int rc; 67 68 if (!np) 69 return -ENODEV; 70 71 gpio_dev = devm_kzalloc(dev, sizeof(*gpio_dev), GFP_KERNEL); 72 if (!gpio_dev) 73 return -ENOMEM; 74 75 gpio_dev->gpiod = devm_gpiod_get(dev, NULL, GPIOD_IN); 76 if (IS_ERR(gpio_dev->gpiod)) 77 return dev_err_probe(dev, PTR_ERR(gpio_dev->gpiod), 78 "error getting gpio\n"); 79 gpio_dev->irq = gpiod_to_irq(gpio_dev->gpiod); 80 if (gpio_dev->irq < 0) 81 return gpio_dev->irq; 82 83 rcdev = devm_rc_allocate_device(dev, RC_DRIVER_IR_RAW); 84 if (!rcdev) 85 return -ENOMEM; 86 87 rcdev->priv = gpio_dev; 88 rcdev->device_name = GPIO_IR_DEVICE_NAME; 89 rcdev->input_phys = GPIO_IR_DEVICE_NAME "/input0"; 90 rcdev->input_id.bustype = BUS_HOST; 91 rcdev->input_id.vendor = 0x0001; 92 rcdev->input_id.product = 0x0001; 93 rcdev->input_id.version = 0x0100; 94 rcdev->dev.parent = dev; 95 rcdev->driver_name = KBUILD_MODNAME; 96 rcdev->min_timeout = 1; 97 rcdev->timeout = IR_DEFAULT_TIMEOUT; 98 rcdev->max_timeout = 10 * IR_DEFAULT_TIMEOUT; 99 rcdev->allowed_protocols = RC_PROTO_BIT_ALL_IR_DECODER; 100 rcdev->map_name = of_get_property(np, "linux,rc-map-name", NULL); 101 if (!rcdev->map_name) 102 rcdev->map_name = RC_MAP_EMPTY; 103 104 gpio_dev->rcdev = rcdev; 105 if (of_property_read_bool(np, "wakeup-source")) 106 device_init_wakeup(dev, true); 107 108 rc = devm_rc_register_device(dev, rcdev); 109 if (rc < 0) { 110 dev_err(dev, "failed to register rc device (%d)\n", rc); 111 return rc; 112 } 113 114 of_property_read_u32(np, "linux,autosuspend-period", &period); 115 if (period) { 116 gpio_dev->pmdev = dev; 117 pm_runtime_set_autosuspend_delay(dev, period); 118 pm_runtime_use_autosuspend(dev); 119 pm_runtime_set_suspended(dev); 120 pm_runtime_enable(dev); 121 } 122 123 platform_set_drvdata(pdev, gpio_dev); 124 125 return devm_request_irq(dev, gpio_dev->irq, gpio_ir_recv_irq, 126 IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING, 127 "gpio-ir-recv-irq", gpio_dev); 128 } 129 130 static void gpio_ir_recv_remove(struct platform_device *pdev) 131 { 132 struct gpio_rc_dev *gpio_dev = platform_get_drvdata(pdev); 133 struct device *pmdev = gpio_dev->pmdev; 134 135 if (pmdev) { 136 pm_runtime_get_sync(pmdev); 137 cpu_latency_qos_remove_request(&gpio_dev->qos); 138 139 pm_runtime_disable(pmdev); 140 pm_runtime_put_noidle(pmdev); 141 pm_runtime_set_suspended(pmdev); 142 } 143 } 144 145 #ifdef CONFIG_PM 146 static int gpio_ir_recv_suspend(struct device *dev) 147 { 148 struct gpio_rc_dev *gpio_dev = dev_get_drvdata(dev); 149 150 if (device_may_wakeup(dev)) 151 enable_irq_wake(gpio_dev->irq); 152 else 153 disable_irq(gpio_dev->irq); 154 155 return 0; 156 } 157 158 static int gpio_ir_recv_resume(struct device *dev) 159 { 160 struct gpio_rc_dev *gpio_dev = dev_get_drvdata(dev); 161 162 if (device_may_wakeup(dev)) 163 disable_irq_wake(gpio_dev->irq); 164 else 165 enable_irq(gpio_dev->irq); 166 167 return 0; 168 } 169 170 static int gpio_ir_recv_runtime_suspend(struct device *dev) 171 { 172 struct gpio_rc_dev *gpio_dev = dev_get_drvdata(dev); 173 174 cpu_latency_qos_remove_request(&gpio_dev->qos); 175 176 return 0; 177 } 178 179 static int gpio_ir_recv_runtime_resume(struct device *dev) 180 { 181 struct gpio_rc_dev *gpio_dev = dev_get_drvdata(dev); 182 183 cpu_latency_qos_add_request(&gpio_dev->qos, 0); 184 185 return 0; 186 } 187 188 static const struct dev_pm_ops gpio_ir_recv_pm_ops = { 189 .suspend = gpio_ir_recv_suspend, 190 .resume = gpio_ir_recv_resume, 191 .runtime_suspend = gpio_ir_recv_runtime_suspend, 192 .runtime_resume = gpio_ir_recv_runtime_resume, 193 }; 194 #endif 195 196 static const struct of_device_id gpio_ir_recv_of_match[] = { 197 { .compatible = "gpio-ir-receiver", }, 198 { }, 199 }; 200 MODULE_DEVICE_TABLE(of, gpio_ir_recv_of_match); 201 202 static struct platform_driver gpio_ir_recv_driver = { 203 .probe = gpio_ir_recv_probe, 204 .remove = gpio_ir_recv_remove, 205 .driver = { 206 .name = KBUILD_MODNAME, 207 .of_match_table = gpio_ir_recv_of_match, 208 #ifdef CONFIG_PM 209 .pm = &gpio_ir_recv_pm_ops, 210 #endif 211 }, 212 }; 213 module_platform_driver(gpio_ir_recv_driver); 214 215 MODULE_DESCRIPTION("GPIO IR Receiver driver"); 216 MODULE_LICENSE("GPL v2"); 217