treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 157
[sfrench/cifs-2.6.git] / drivers / media / pci / cx88 / cx88-vp3054-i2c.c
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  * cx88-vp3054-i2c.c -- support for the secondary I2C bus of the
4  *                      DNTV Live! DVB-T Pro (VP-3054), wired as:
5  *                      GPIO[0] -> SCL, GPIO[1] -> SDA
6  *
7  * (c) 2005 Chris Pascoe <c.pascoe@itee.uq.edu.au>
8  */
9
10 #include "cx88.h"
11 #include "cx88-vp3054-i2c.h"
12
13 #include <linux/module.h>
14 #include <linux/slab.h>
15 #include <linux/init.h>
16 #include <linux/io.h>
17
18 MODULE_DESCRIPTION("driver for cx2388x VP3054 design");
19 MODULE_AUTHOR("Chris Pascoe <c.pascoe@itee.uq.edu.au>");
20 MODULE_LICENSE("GPL");
21
22 /* ----------------------------------------------------------------------- */
23
24 static void vp3054_bit_setscl(void *data, int state)
25 {
26         struct cx8802_dev *dev = data;
27         struct cx88_core *core = dev->core;
28         struct vp3054_i2c_state *vp3054_i2c = dev->vp3054;
29
30         if (state) {
31                 vp3054_i2c->state |=  0x0001;   /* SCL high */
32                 vp3054_i2c->state &= ~0x0100;   /* external pullup */
33         } else {
34                 vp3054_i2c->state &= ~0x0001;   /* SCL low */
35                 vp3054_i2c->state |=  0x0100;   /* drive pin */
36         }
37         cx_write(MO_GP0_IO, 0x010000 | vp3054_i2c->state);
38         cx_read(MO_GP0_IO);
39 }
40
41 static void vp3054_bit_setsda(void *data, int state)
42 {
43         struct cx8802_dev *dev = data;
44         struct cx88_core *core = dev->core;
45         struct vp3054_i2c_state *vp3054_i2c = dev->vp3054;
46
47         if (state) {
48                 vp3054_i2c->state |=  0x0002;   /* SDA high */
49                 vp3054_i2c->state &= ~0x0200;   /* tristate pin */
50         } else {
51                 vp3054_i2c->state &= ~0x0002;   /* SDA low */
52                 vp3054_i2c->state |=  0x0200;   /* drive pin */
53         }
54         cx_write(MO_GP0_IO, 0x020000 | vp3054_i2c->state);
55         cx_read(MO_GP0_IO);
56 }
57
58 static int vp3054_bit_getscl(void *data)
59 {
60         struct cx8802_dev *dev = data;
61         struct cx88_core *core = dev->core;
62         u32 state;
63
64         state = cx_read(MO_GP0_IO);
65         return (state & 0x01) ? 1 : 0;
66 }
67
68 static int vp3054_bit_getsda(void *data)
69 {
70         struct cx8802_dev *dev = data;
71         struct cx88_core *core = dev->core;
72         u32 state;
73
74         state = cx_read(MO_GP0_IO);
75         return (state & 0x02) ? 1 : 0;
76 }
77
78 /* ----------------------------------------------------------------------- */
79
80 static const struct i2c_algo_bit_data vp3054_i2c_algo_template = {
81         .setsda  = vp3054_bit_setsda,
82         .setscl  = vp3054_bit_setscl,
83         .getsda  = vp3054_bit_getsda,
84         .getscl  = vp3054_bit_getscl,
85         .udelay  = 16,
86         .timeout = 200,
87 };
88
89 /* ----------------------------------------------------------------------- */
90
91 int vp3054_i2c_probe(struct cx8802_dev *dev)
92 {
93         struct cx88_core *core = dev->core;
94         struct vp3054_i2c_state *vp3054_i2c;
95         int rc;
96
97         if (core->boardnr != CX88_BOARD_DNTV_LIVE_DVB_T_PRO)
98                 return 0;
99
100         vp3054_i2c = kzalloc(sizeof(*vp3054_i2c), GFP_KERNEL);
101         if (!vp3054_i2c)
102                 return -ENOMEM;
103         dev->vp3054 = vp3054_i2c;
104
105         vp3054_i2c->algo = vp3054_i2c_algo_template;
106
107         vp3054_i2c->adap.dev.parent = &dev->pci->dev;
108         strscpy(vp3054_i2c->adap.name, core->name,
109                 sizeof(vp3054_i2c->adap.name));
110         vp3054_i2c->adap.owner = THIS_MODULE;
111         vp3054_i2c->algo.data = dev;
112         i2c_set_adapdata(&vp3054_i2c->adap, dev);
113         vp3054_i2c->adap.algo_data = &vp3054_i2c->algo;
114
115         vp3054_bit_setscl(dev, 1);
116         vp3054_bit_setsda(dev, 1);
117
118         rc = i2c_bit_add_bus(&vp3054_i2c->adap);
119         if (rc != 0) {
120                 pr_err("vp3054_i2c register FAILED\n");
121
122                 kfree(dev->vp3054);
123                 dev->vp3054 = NULL;
124         }
125
126         return rc;
127 }
128 EXPORT_SYMBOL(vp3054_i2c_probe);
129
130 void vp3054_i2c_remove(struct cx8802_dev *dev)
131 {
132         struct vp3054_i2c_state *vp3054_i2c = dev->vp3054;
133
134         if (!vp3054_i2c ||
135             dev->core->boardnr != CX88_BOARD_DNTV_LIVE_DVB_T_PRO)
136                 return;
137
138         i2c_del_adapter(&vp3054_i2c->adap);
139         kfree(vp3054_i2c);
140 }
141 EXPORT_SYMBOL(vp3054_i2c_remove);