xref: /openbmc/linux/drivers/media/radio/tef6862.c (revision 4800cd83)
1 /*
2  * tef6862.c Philips TEF6862 Car Radio Enhanced Selectivity Tuner
3  * Copyright (c) 2009 Intel Corporation
4  *
5  * This program is free software; you can redistribute it and/or modify
6  * it under the terms of the GNU General Public License version 2 as
7  * published by the Free Software Foundation.
8  *
9  * This program is distributed in the hope that it will be useful,
10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
12  * GNU General Public License for more details.
13  *
14  * You should have received a copy of the GNU General Public License
15  * along with this program; if not, write to the Free Software
16  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
17  */
18 
19 #include <linux/module.h>
20 #include <linux/init.h>
21 #include <linux/errno.h>
22 #include <linux/kernel.h>
23 #include <linux/interrupt.h>
24 #include <linux/i2c.h>
25 #include <linux/slab.h>
26 #include <media/v4l2-ioctl.h>
27 #include <media/v4l2-device.h>
28 #include <media/v4l2-chip-ident.h>
29 
30 #define DRIVER_NAME "tef6862"
31 
32 #define FREQ_MUL 16000
33 
34 #define TEF6862_LO_FREQ (875 * FREQ_MUL / 10)
35 #define TEF6862_HI_FREQ (108 * FREQ_MUL)
36 
37 /* Write mode sub addresses */
38 #define WM_SUB_BANDWIDTH	0x0
39 #define WM_SUB_PLLM		0x1
40 #define WM_SUB_PLLL		0x2
41 #define WM_SUB_DAA		0x3
42 #define WM_SUB_AGC		0x4
43 #define WM_SUB_BAND		0x5
44 #define WM_SUB_CONTROL		0x6
45 #define WM_SUB_LEVEL		0x7
46 #define WM_SUB_IFCF		0x8
47 #define WM_SUB_IFCAP		0x9
48 #define WM_SUB_ACD		0xA
49 #define WM_SUB_TEST		0xF
50 
51 /* Different modes of the MSA register */
52 #define MODE_BUFFER		0x0
53 #define MODE_PRESET		0x1
54 #define MODE_SEARCH		0x2
55 #define MODE_AF_UPDATE		0x3
56 #define MODE_JUMP		0x4
57 #define MODE_CHECK		0x5
58 #define MODE_LOAD		0x6
59 #define MODE_END		0x7
60 #define MODE_SHIFT		5
61 
62 struct tef6862_state {
63 	struct v4l2_subdev sd;
64 	unsigned long freq;
65 };
66 
67 static inline struct tef6862_state *to_state(struct v4l2_subdev *sd)
68 {
69 	return container_of(sd, struct tef6862_state, sd);
70 }
71 
72 static u16 tef6862_sigstr(struct i2c_client *client)
73 {
74 	u8 buf[4];
75 	int err = i2c_master_recv(client, buf, sizeof(buf));
76 	if (err == sizeof(buf))
77 		return buf[3] << 8;
78 	return 0;
79 }
80 
81 static int tef6862_g_tuner(struct v4l2_subdev *sd, struct v4l2_tuner *v)
82 {
83 	if (v->index > 0)
84 		return -EINVAL;
85 
86 	/* only support FM for now */
87 	strlcpy(v->name, "FM", sizeof(v->name));
88 	v->type = V4L2_TUNER_RADIO;
89 	v->rangelow = TEF6862_LO_FREQ;
90 	v->rangehigh = TEF6862_HI_FREQ;
91 	v->rxsubchans = V4L2_TUNER_SUB_MONO;
92 	v->capability = V4L2_TUNER_CAP_LOW;
93 	v->audmode = V4L2_TUNER_MODE_STEREO;
94 	v->signal = tef6862_sigstr(v4l2_get_subdevdata(sd));
95 
96 	return 0;
97 }
98 
99 static int tef6862_s_tuner(struct v4l2_subdev *sd, struct v4l2_tuner *v)
100 {
101 	return v->index ? -EINVAL : 0;
102 }
103 
104 static int tef6862_s_frequency(struct v4l2_subdev *sd, struct v4l2_frequency *f)
105 {
106 	struct tef6862_state *state = to_state(sd);
107 	struct i2c_client *client = v4l2_get_subdevdata(sd);
108 	u16 pll;
109 	u8 i2cmsg[3];
110 	int err;
111 
112 	if (f->tuner != 0)
113 		return -EINVAL;
114 
115 	pll = 1964 + ((f->frequency - TEF6862_LO_FREQ) * 20) / FREQ_MUL;
116 	i2cmsg[0] = (MODE_PRESET << MODE_SHIFT) | WM_SUB_PLLM;
117 	i2cmsg[1] = (pll >> 8) & 0xff;
118 	i2cmsg[2] = pll & 0xff;
119 
120 	err = i2c_master_send(client, i2cmsg, sizeof(i2cmsg));
121 	if (!err)
122 		state->freq = f->frequency;
123 	return err;
124 }
125 
126 static int tef6862_g_frequency(struct v4l2_subdev *sd, struct v4l2_frequency *f)
127 {
128 	struct tef6862_state *state = to_state(sd);
129 
130 	if (f->tuner != 0)
131 		return -EINVAL;
132 	f->type = V4L2_TUNER_RADIO;
133 	f->frequency = state->freq;
134 	return 0;
135 }
136 
137 static int tef6862_g_chip_ident(struct v4l2_subdev *sd,
138 	struct v4l2_dbg_chip_ident *chip)
139 {
140 	struct i2c_client *client = v4l2_get_subdevdata(sd);
141 
142 	return v4l2_chip_ident_i2c_client(client, chip, V4L2_IDENT_TEF6862, 0);
143 }
144 
145 static const struct v4l2_subdev_tuner_ops tef6862_tuner_ops = {
146 	.g_tuner = tef6862_g_tuner,
147 	.s_tuner = tef6862_s_tuner,
148 	.s_frequency = tef6862_s_frequency,
149 	.g_frequency = tef6862_g_frequency,
150 };
151 
152 static const struct v4l2_subdev_core_ops tef6862_core_ops = {
153 	.g_chip_ident = tef6862_g_chip_ident,
154 };
155 
156 static const struct v4l2_subdev_ops tef6862_ops = {
157 	.core = &tef6862_core_ops,
158 	.tuner = &tef6862_tuner_ops,
159 };
160 
161 /*
162  * Generic i2c probe
163  * concerning the addresses: i2c wants 7 bit (without the r/w bit), so '>>1'
164  */
165 
166 static int __devinit tef6862_probe(struct i2c_client *client,
167 			const struct i2c_device_id *id)
168 {
169 	struct tef6862_state *state;
170 	struct v4l2_subdev *sd;
171 
172 	/* Check if the adapter supports the needed features */
173 	if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
174 		return -EIO;
175 
176 	v4l_info(client, "chip found @ 0x%02x (%s)\n",
177 			client->addr << 1, client->adapter->name);
178 
179 	state = kmalloc(sizeof(struct tef6862_state), GFP_KERNEL);
180 	if (state == NULL)
181 		return -ENOMEM;
182 	state->freq = TEF6862_LO_FREQ;
183 
184 	sd = &state->sd;
185 	v4l2_i2c_subdev_init(sd, client, &tef6862_ops);
186 
187 	return 0;
188 }
189 
190 static int __devexit tef6862_remove(struct i2c_client *client)
191 {
192 	struct v4l2_subdev *sd = i2c_get_clientdata(client);
193 
194 	v4l2_device_unregister_subdev(sd);
195 	kfree(to_state(sd));
196 	return 0;
197 }
198 
199 static const struct i2c_device_id tef6862_id[] = {
200 	{DRIVER_NAME, 0},
201 	{},
202 };
203 
204 MODULE_DEVICE_TABLE(i2c, tef6862_id);
205 
206 static struct i2c_driver tef6862_driver = {
207 	.driver = {
208 		.owner	= THIS_MODULE,
209 		.name	= DRIVER_NAME,
210 	},
211 	.probe		= tef6862_probe,
212 	.remove		= tef6862_remove,
213 	.id_table	= tef6862_id,
214 };
215 
216 static __init int tef6862_init(void)
217 {
218 	return i2c_add_driver(&tef6862_driver);
219 }
220 
221 static __exit void tef6862_exit(void)
222 {
223 	i2c_del_driver(&tef6862_driver);
224 }
225 
226 module_init(tef6862_init);
227 module_exit(tef6862_exit);
228 
229 MODULE_DESCRIPTION("TEF6862 Car Radio Enhanced Selectivity Tuner");
230 MODULE_AUTHOR("Mocean Laboratories");
231 MODULE_LICENSE("GPL v2");
232 
233