1 /*
2  * Allwinner Reduced Serial Bus Driver
3  *
4  * Copyright (c) 2015 Chen-Yu Tsai
5  *
6  * Author: Chen-Yu Tsai <wens@csie.org>
7  *
8  * This file is licensed under the terms of the GNU General Public
9  * License version 2.  This program is licensed "as is" without any
10  * warranty of any kind, whether express or implied.
11  */
12 #ifndef _SUNXI_RSB_H
13 #define _SUNXI_RSB_H
14 
15 #include <linux/device.h>
16 #include <linux/regmap.h>
17 #include <linux/types.h>
18 
19 struct sunxi_rsb;
20 
21 /**
22  * struct sunxi_rsb_device - Basic representation of an RSB device
23  * @dev:	Driver model representation of the device.
24  * @ctrl:	RSB controller managing the bus hosting this device.
25  * @rtaddr:	This device's runtime address
26  * @hwaddr:	This device's hardware address
27  */
28 struct sunxi_rsb_device {
29 	struct device		dev;
30 	struct sunxi_rsb	*rsb;
31 	int			irq;
32 	u8			rtaddr;
33 	u16			hwaddr;
34 };
35 
to_sunxi_rsb_device(struct device * d)36 static inline struct sunxi_rsb_device *to_sunxi_rsb_device(struct device *d)
37 {
38 	return container_of(d, struct sunxi_rsb_device, dev);
39 }
40 
sunxi_rsb_device_get_drvdata(const struct sunxi_rsb_device * rdev)41 static inline void *sunxi_rsb_device_get_drvdata(const struct sunxi_rsb_device *rdev)
42 {
43 	return dev_get_drvdata(&rdev->dev);
44 }
45 
sunxi_rsb_device_set_drvdata(struct sunxi_rsb_device * rdev,void * data)46 static inline void sunxi_rsb_device_set_drvdata(struct sunxi_rsb_device *rdev,
47 						void *data)
48 {
49 	dev_set_drvdata(&rdev->dev, data);
50 }
51 
52 /**
53  * struct sunxi_rsb_driver - RSB slave device driver
54  * @driver:	RSB device drivers should initialize name and owner field of
55  *		this structure.
56  * @probe:	binds this driver to a RSB device.
57  * @remove:	unbinds this driver from the RSB device.
58  */
59 struct sunxi_rsb_driver {
60 	struct device_driver driver;
61 	int (*probe)(struct sunxi_rsb_device *rdev);
62 	int (*remove)(struct sunxi_rsb_device *rdev);
63 };
64 
to_sunxi_rsb_driver(struct device_driver * d)65 static inline struct sunxi_rsb_driver *to_sunxi_rsb_driver(struct device_driver *d)
66 {
67 	return container_of(d, struct sunxi_rsb_driver, driver);
68 }
69 
70 int sunxi_rsb_driver_register(struct sunxi_rsb_driver *rdrv);
71 
72 /**
73  * sunxi_rsb_driver_unregister() - unregister an RSB client driver
74  * @rdrv:	the driver to unregister
75  */
sunxi_rsb_driver_unregister(struct sunxi_rsb_driver * rdrv)76 static inline void sunxi_rsb_driver_unregister(struct sunxi_rsb_driver *rdrv)
77 {
78 	if (rdrv)
79 		driver_unregister(&rdrv->driver);
80 }
81 
82 #define module_sunxi_rsb_driver(__sunxi_rsb_driver) \
83 	module_driver(__sunxi_rsb_driver, sunxi_rsb_driver_register, \
84 			sunxi_rsb_driver_unregister)
85 
86 struct regmap *__devm_regmap_init_sunxi_rsb(struct sunxi_rsb_device *rdev,
87 					    const struct regmap_config *config,
88 					    struct lock_class_key *lock_key,
89 					    const char *lock_name);
90 
91 /**
92  * devm_regmap_init_sunxi_rsb(): Initialise managed register map
93  *
94  * @rdev: Device that will be interacted with
95  * @config: Configuration for register map
96  *
97  * The return value will be an ERR_PTR() on error or a valid pointer
98  * to a struct regmap.  The regmap will be automatically freed by the
99  * device management code.
100  */
101 #define devm_regmap_init_sunxi_rsb(rdev, config)			\
102 	__regmap_lockdep_wrapper(__devm_regmap_init_sunxi_rsb, #config,	\
103 				 rdev, config)
104 
105 #endif /* _SUNXI_RSB_H */
106