1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Driver for STM32 Digital Camera Memory Interface Pixel Processor
4 *
5 * Copyright (C) STMicroelectronics SA 2023
6 * Authors: Hugues Fruchet <hugues.fruchet@foss.st.com>
7 * Alain Volmat <alain.volmat@foss.st.com>
8 * for STMicroelectronics.
9 */
10
11 #include <linux/init.h>
12 #include <linux/module.h>
13
14 #include "dcmipp-common.h"
15
16 /* Helper function to allocate and initialize pads */
dcmipp_pads_init(u16 num_pads,const unsigned long * pads_flags)17 struct media_pad *dcmipp_pads_init(u16 num_pads, const unsigned long *pads_flags)
18 {
19 struct media_pad *pads;
20 unsigned int i;
21
22 /* Allocate memory for the pads */
23 pads = kcalloc(num_pads, sizeof(*pads), GFP_KERNEL);
24 if (!pads)
25 return ERR_PTR(-ENOMEM);
26
27 /* Initialize the pads */
28 for (i = 0; i < num_pads; i++) {
29 pads[i].index = i;
30 pads[i].flags = pads_flags[i];
31 }
32
33 return pads;
34 }
35
36 static const struct media_entity_operations dcmipp_entity_ops = {
37 .link_validate = v4l2_subdev_link_validate,
38 };
39
dcmipp_ent_sd_register(struct dcmipp_ent_device * ved,struct v4l2_subdev * sd,struct v4l2_device * v4l2_dev,const char * const name,u32 function,u16 num_pads,const unsigned long * pads_flag,const struct v4l2_subdev_internal_ops * sd_int_ops,const struct v4l2_subdev_ops * sd_ops,irq_handler_t handler,irq_handler_t thread_fn)40 int dcmipp_ent_sd_register(struct dcmipp_ent_device *ved,
41 struct v4l2_subdev *sd,
42 struct v4l2_device *v4l2_dev,
43 const char *const name,
44 u32 function,
45 u16 num_pads,
46 const unsigned long *pads_flag,
47 const struct v4l2_subdev_internal_ops *sd_int_ops,
48 const struct v4l2_subdev_ops *sd_ops,
49 irq_handler_t handler,
50 irq_handler_t thread_fn)
51 {
52 int ret;
53
54 /* Allocate the pads. Should be released from the sd_int_op release */
55 ved->pads = dcmipp_pads_init(num_pads, pads_flag);
56 if (IS_ERR(ved->pads))
57 return PTR_ERR(ved->pads);
58
59 /* Fill the dcmipp_ent_device struct */
60 ved->ent = &sd->entity;
61
62 /* Initialize the subdev */
63 v4l2_subdev_init(sd, sd_ops);
64 sd->internal_ops = sd_int_ops;
65 sd->entity.function = function;
66 sd->entity.ops = &dcmipp_entity_ops;
67 sd->owner = THIS_MODULE;
68 strscpy(sd->name, name, sizeof(sd->name));
69 v4l2_set_subdevdata(sd, ved);
70
71 /* Expose this subdev to user space */
72 sd->flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
73 if (sd->ctrl_handler)
74 sd->flags |= V4L2_SUBDEV_FL_HAS_EVENTS;
75
76 /* Initialize the media entity */
77 ret = media_entity_pads_init(&sd->entity, num_pads, ved->pads);
78 if (ret)
79 goto err_clean_pads;
80
81 ret = v4l2_subdev_init_finalize(sd);
82 if (ret < 0)
83 goto err_clean_m_ent;
84
85 /* Register the subdev with the v4l2 and the media framework */
86 ret = v4l2_device_register_subdev(v4l2_dev, sd);
87 if (ret) {
88 dev_err(v4l2_dev->dev,
89 "%s: subdev register failed (err=%d)\n",
90 name, ret);
91 goto err_clean_m_ent;
92 }
93
94 ved->handler = handler;
95 ved->thread_fn = thread_fn;
96
97 return 0;
98
99 err_clean_m_ent:
100 media_entity_cleanup(&sd->entity);
101 err_clean_pads:
102 dcmipp_pads_cleanup(ved->pads);
103 return ret;
104 }
105
106 void
dcmipp_ent_sd_unregister(struct dcmipp_ent_device * ved,struct v4l2_subdev * sd)107 dcmipp_ent_sd_unregister(struct dcmipp_ent_device *ved, struct v4l2_subdev *sd)
108 {
109 media_entity_cleanup(ved->ent);
110 v4l2_device_unregister_subdev(sd);
111 }
112