1 /* Copyright (c) 2012, Code Aurora Forum. All rights reserved.
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.
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.
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>
20 #include <linux/of_gpio.h>
21 #include <linux/platform_device.h>
22 #include <linux/irq.h>
23 #include <media/rc-core.h>
24 #include <media/gpio-ir-recv.h>
26 #define GPIO_IR_DRIVER_NAME "gpio-rc-recv"
27 #define GPIO_IR_DEVICE_NAME "gpio_ir_recv"
37 * Translate OpenFirmware node properties into platform_data
39 static int gpio_ir_recv_get_devtree_pdata(struct device
*dev
,
40 struct gpio_ir_recv_platform_data
*pdata
)
42 struct device_node
*np
= dev
->of_node
;
43 enum of_gpio_flags flags
;
46 gpio
= of_get_gpio_flags(np
, 0, &flags
);
48 if (gpio
!= -EPROBE_DEFER
)
49 dev_err(dev
, "Failed to get gpio flags (%d)\n", gpio
);
53 pdata
->gpio_nr
= gpio
;
54 pdata
->active_low
= (flags
& OF_GPIO_ACTIVE_LOW
);
55 /* probe() takes care of map_name == NULL or allowed_protos == 0 */
56 pdata
->map_name
= of_get_property(np
, "linux,rc-map-name", NULL
);
57 pdata
->allowed_protos
= 0;
62 static struct of_device_id gpio_ir_recv_of_match
[] = {
63 { .compatible
= "gpio-ir-receiver", },
66 MODULE_DEVICE_TABLE(of
, gpio_ir_recv_of_match
);
68 #else /* !CONFIG_OF */
70 #define gpio_ir_recv_get_devtree_pdata(dev, pdata) (-ENOSYS)
74 static irqreturn_t
gpio_ir_recv_irq(int irq
, void *dev_id
)
76 struct gpio_rc_dev
*gpio_dev
= dev_id
;
79 enum raw_event_type type
= IR_SPACE
;
81 gval
= gpio_get_value_cansleep(gpio_dev
->gpio_nr
);
86 if (gpio_dev
->active_low
)
92 rc
= ir_raw_event_store_edge(gpio_dev
->rcdev
, type
);
96 ir_raw_event_handle(gpio_dev
->rcdev
);
102 static int gpio_ir_recv_probe(struct platform_device
*pdev
)
104 struct gpio_rc_dev
*gpio_dev
;
105 struct rc_dev
*rcdev
;
106 const struct gpio_ir_recv_platform_data
*pdata
=
107 pdev
->dev
.platform_data
;
110 if (pdev
->dev
.of_node
) {
111 struct gpio_ir_recv_platform_data
*dtpdata
=
112 devm_kzalloc(&pdev
->dev
, sizeof(*dtpdata
), GFP_KERNEL
);
115 rc
= gpio_ir_recv_get_devtree_pdata(&pdev
->dev
, dtpdata
);
124 if (pdata
->gpio_nr
< 0)
127 gpio_dev
= kzalloc(sizeof(struct gpio_rc_dev
), GFP_KERNEL
);
131 rcdev
= rc_allocate_device();
134 goto err_allocate_device
;
137 rcdev
->priv
= gpio_dev
;
138 rcdev
->driver_type
= RC_DRIVER_IR_RAW
;
139 rcdev
->input_name
= GPIO_IR_DEVICE_NAME
;
140 rcdev
->input_phys
= GPIO_IR_DEVICE_NAME
"/input0";
141 rcdev
->input_id
.bustype
= BUS_HOST
;
142 rcdev
->input_id
.vendor
= 0x0001;
143 rcdev
->input_id
.product
= 0x0001;
144 rcdev
->input_id
.version
= 0x0100;
145 rcdev
->dev
.parent
= &pdev
->dev
;
146 rcdev
->driver_name
= GPIO_IR_DRIVER_NAME
;
147 if (pdata
->allowed_protos
)
148 rcdev
->allowed_protocols
= pdata
->allowed_protos
;
150 rcdev
->allowed_protocols
= RC_BIT_ALL
;
151 rcdev
->map_name
= pdata
->map_name
?: RC_MAP_EMPTY
;
153 gpio_dev
->rcdev
= rcdev
;
154 gpio_dev
->gpio_nr
= pdata
->gpio_nr
;
155 gpio_dev
->active_low
= pdata
->active_low
;
157 rc
= gpio_request(pdata
->gpio_nr
, "gpio-ir-recv");
159 goto err_gpio_request
;
160 rc
= gpio_direction_input(pdata
->gpio_nr
);
162 goto err_gpio_direction_input
;
164 rc
= rc_register_device(rcdev
);
166 dev_err(&pdev
->dev
, "failed to register rc device\n");
167 goto err_register_rc_device
;
170 platform_set_drvdata(pdev
, gpio_dev
);
172 rc
= request_any_context_irq(gpio_to_irq(pdata
->gpio_nr
),
174 IRQF_TRIGGER_FALLING
| IRQF_TRIGGER_RISING
,
175 "gpio-ir-recv-irq", gpio_dev
);
177 goto err_request_irq
;
182 rc_unregister_device(rcdev
);
184 err_register_rc_device
:
185 err_gpio_direction_input
:
186 gpio_free(pdata
->gpio_nr
);
188 rc_free_device(rcdev
);
194 static int gpio_ir_recv_remove(struct platform_device
*pdev
)
196 struct gpio_rc_dev
*gpio_dev
= platform_get_drvdata(pdev
);
198 free_irq(gpio_to_irq(gpio_dev
->gpio_nr
), gpio_dev
);
199 rc_unregister_device(gpio_dev
->rcdev
);
200 gpio_free(gpio_dev
->gpio_nr
);
206 static int gpio_ir_recv_suspend(struct device
*dev
)
208 struct platform_device
*pdev
= to_platform_device(dev
);
209 struct gpio_rc_dev
*gpio_dev
= platform_get_drvdata(pdev
);
211 if (device_may_wakeup(dev
))
212 enable_irq_wake(gpio_to_irq(gpio_dev
->gpio_nr
));
214 disable_irq(gpio_to_irq(gpio_dev
->gpio_nr
));
219 static int gpio_ir_recv_resume(struct device
*dev
)
221 struct platform_device
*pdev
= to_platform_device(dev
);
222 struct gpio_rc_dev
*gpio_dev
= platform_get_drvdata(pdev
);
224 if (device_may_wakeup(dev
))
225 disable_irq_wake(gpio_to_irq(gpio_dev
->gpio_nr
));
227 enable_irq(gpio_to_irq(gpio_dev
->gpio_nr
));
232 static const struct dev_pm_ops gpio_ir_recv_pm_ops
= {
233 .suspend
= gpio_ir_recv_suspend
,
234 .resume
= gpio_ir_recv_resume
,
238 static struct platform_driver gpio_ir_recv_driver
= {
239 .probe
= gpio_ir_recv_probe
,
240 .remove
= gpio_ir_recv_remove
,
242 .name
= GPIO_IR_DRIVER_NAME
,
243 .of_match_table
= of_match_ptr(gpio_ir_recv_of_match
),
245 .pm
= &gpio_ir_recv_pm_ops
,
249 module_platform_driver(gpio_ir_recv_driver
);
251 MODULE_DESCRIPTION("GPIO IR Receiver driver");
252 MODULE_LICENSE("GPL v2");