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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> | |
8ab1aa87 | 19 | #include <linux/of.h> |
2fd7f398 | 20 | #include <linux/of_gpio.h> |
fd0f6851 RK |
21 | #include <linux/platform_device.h> |
22 | #include <linux/irq.h> | |
23 | #include <media/rc-core.h> | |
eb4b0ec7 | 24 | #include <linux/platform_data/media/gpio-ir-recv.h> |
fd0f6851 RK |
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; | |
955b4430 | 31 | int gpio_nr; |
fd0f6851 | 32 | bool active_low; |
3fb136f3 | 33 | struct timer_list flush_timer; |
fd0f6851 RK |
34 | }; |
35 | ||
2fd7f398 SH |
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 | ||
7f099a75 | 63 | static const struct of_device_id gpio_ir_recv_of_match[] = { |
2fd7f398 SH |
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 | ||
fd0f6851 RK |
75 | static irqreturn_t gpio_ir_recv_irq(int irq, void *dev_id) |
76 | { | |
77 | struct gpio_rc_dev *gpio_dev = dev_id; | |
955b4430 | 78 | int gval; |
fd0f6851 RK |
79 | int rc = 0; |
80 | enum raw_event_type type = IR_SPACE; | |
81 | ||
64657066 | 82 | gval = gpio_get_value(gpio_dev->gpio_nr); |
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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 | ||
3fb136f3 EN |
97 | mod_timer(&gpio_dev->flush_timer, |
98 | jiffies + nsecs_to_jiffies(gpio_dev->rcdev->timeout)); | |
99 | ||
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100 | ir_raw_event_handle(gpio_dev->rcdev); |
101 | ||
102 | err_get_value: | |
103 | return IRQ_HANDLED; | |
104 | } | |
105 | ||
3fb136f3 EN |
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 | ||
4c62e976 | 117 | static int gpio_ir_recv_probe(struct platform_device *pdev) |
fd0f6851 RK |
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 | ||
2fd7f398 SH |
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 | ||
fd0f6851 RK |
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(); | |
147 | if (!rcdev) { | |
148 | rc = -ENOMEM; | |
149 | goto err_allocate_device; | |
150 | } | |
151 | ||
975ef32e | 152 | rcdev->priv = gpio_dev; |
fd0f6851 | 153 | rcdev->driver_type = RC_DRIVER_IR_RAW; |
fd0f6851 | 154 | rcdev->input_name = GPIO_IR_DEVICE_NAME; |
975ef32e | 155 | rcdev->input_phys = GPIO_IR_DEVICE_NAME "/input0"; |
fd0f6851 | 156 | rcdev->input_id.bustype = BUS_HOST; |
975ef32e BT |
157 | rcdev->input_id.vendor = 0x0001; |
158 | rcdev->input_id.product = 0x0001; | |
159 | rcdev->input_id.version = 0x0100; | |
160 | rcdev->dev.parent = &pdev->dev; | |
fd0f6851 | 161 | rcdev->driver_name = GPIO_IR_DRIVER_NAME; |
3fb136f3 EN |
162 | rcdev->min_timeout = 0; |
163 | rcdev->timeout = IR_DEFAULT_TIMEOUT; | |
164 | rcdev->max_timeout = 10 * IR_DEFAULT_TIMEOUT; | |
500c3201 | 165 | if (pdata->allowed_protos) |
c5540fbb | 166 | rcdev->allowed_protocols = pdata->allowed_protos; |
500c3201 | 167 | else |
c5540fbb | 168 | rcdev->allowed_protocols = RC_BIT_ALL; |
2bd237b8 | 169 | rcdev->map_name = pdata->map_name ?: RC_MAP_EMPTY; |
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170 | |
171 | gpio_dev->rcdev = rcdev; | |
172 | gpio_dev->gpio_nr = pdata->gpio_nr; | |
173 | gpio_dev->active_low = pdata->active_low; | |
174 | ||
3fb136f3 EN |
175 | setup_timer(&gpio_dev->flush_timer, flush_timer, |
176 | (unsigned long)gpio_dev); | |
177 | ||
fd0f6851 RK |
178 | rc = gpio_request(pdata->gpio_nr, "gpio-ir-recv"); |
179 | if (rc < 0) | |
180 | goto err_gpio_request; | |
181 | rc = gpio_direction_input(pdata->gpio_nr); | |
182 | if (rc < 0) | |
183 | goto err_gpio_direction_input; | |
184 | ||
185 | rc = rc_register_device(rcdev); | |
186 | if (rc < 0) { | |
187 | dev_err(&pdev->dev, "failed to register rc device\n"); | |
188 | goto err_register_rc_device; | |
189 | } | |
190 | ||
191 | platform_set_drvdata(pdev, gpio_dev); | |
192 | ||
193 | rc = request_any_context_irq(gpio_to_irq(pdata->gpio_nr), | |
194 | gpio_ir_recv_irq, | |
195 | IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING, | |
196 | "gpio-ir-recv-irq", gpio_dev); | |
197 | if (rc < 0) | |
198 | goto err_request_irq; | |
199 | ||
200 | return 0; | |
201 | ||
202 | err_request_irq: | |
fd0f6851 | 203 | rc_unregister_device(rcdev); |
e5d85b9a | 204 | rcdev = NULL; |
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205 | err_register_rc_device: |
206 | err_gpio_direction_input: | |
207 | gpio_free(pdata->gpio_nr); | |
208 | err_gpio_request: | |
209 | rc_free_device(rcdev); | |
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210 | err_allocate_device: |
211 | kfree(gpio_dev); | |
212 | return rc; | |
213 | } | |
214 | ||
4c62e976 | 215 | static int gpio_ir_recv_remove(struct platform_device *pdev) |
fd0f6851 RK |
216 | { |
217 | struct gpio_rc_dev *gpio_dev = platform_get_drvdata(pdev); | |
218 | ||
219 | free_irq(gpio_to_irq(gpio_dev->gpio_nr), gpio_dev); | |
3fb136f3 | 220 | del_timer_sync(&gpio_dev->flush_timer); |
fd0f6851 RK |
221 | rc_unregister_device(gpio_dev->rcdev); |
222 | gpio_free(gpio_dev->gpio_nr); | |
fd0f6851 RK |
223 | kfree(gpio_dev); |
224 | return 0; | |
225 | } | |
226 | ||
227 | #ifdef CONFIG_PM | |
228 | static int gpio_ir_recv_suspend(struct device *dev) | |
229 | { | |
230 | struct platform_device *pdev = to_platform_device(dev); | |
231 | struct gpio_rc_dev *gpio_dev = platform_get_drvdata(pdev); | |
232 | ||
233 | if (device_may_wakeup(dev)) | |
234 | enable_irq_wake(gpio_to_irq(gpio_dev->gpio_nr)); | |
235 | else | |
236 | disable_irq(gpio_to_irq(gpio_dev->gpio_nr)); | |
237 | ||
238 | return 0; | |
239 | } | |
240 | ||
241 | static int gpio_ir_recv_resume(struct device *dev) | |
242 | { | |
243 | struct platform_device *pdev = to_platform_device(dev); | |
244 | struct gpio_rc_dev *gpio_dev = platform_get_drvdata(pdev); | |
245 | ||
246 | if (device_may_wakeup(dev)) | |
247 | disable_irq_wake(gpio_to_irq(gpio_dev->gpio_nr)); | |
248 | else | |
249 | enable_irq(gpio_to_irq(gpio_dev->gpio_nr)); | |
250 | ||
251 | return 0; | |
252 | } | |
253 | ||
254 | static const struct dev_pm_ops gpio_ir_recv_pm_ops = { | |
255 | .suspend = gpio_ir_recv_suspend, | |
256 | .resume = gpio_ir_recv_resume, | |
257 | }; | |
258 | #endif | |
259 | ||
260 | static struct platform_driver gpio_ir_recv_driver = { | |
261 | .probe = gpio_ir_recv_probe, | |
4c62e976 | 262 | .remove = gpio_ir_recv_remove, |
fd0f6851 RK |
263 | .driver = { |
264 | .name = GPIO_IR_DRIVER_NAME, | |
2fd7f398 | 265 | .of_match_table = of_match_ptr(gpio_ir_recv_of_match), |
fd0f6851 RK |
266 | #ifdef CONFIG_PM |
267 | .pm = &gpio_ir_recv_pm_ops, | |
268 | #endif | |
269 | }, | |
270 | }; | |
81d75e9f | 271 | module_platform_driver(gpio_ir_recv_driver); |
fd0f6851 RK |
272 | |
273 | MODULE_DESCRIPTION("GPIO IR Receiver driver"); | |
274 | MODULE_LICENSE("GPL v2"); |