1
2
3
4
5
6
7
8
9#include <linux/mfd/wl1273-core.h>
10#include <linux/slab.h>
11#include <linux/module.h>
12
13#define DRIVER_DESC "WL1273 FM Radio Core"
14
15static const struct i2c_device_id wl1273_driver_id_table[] = {
16 { WL1273_FM_DRIVER_NAME, 0 },
17 { }
18};
19MODULE_DEVICE_TABLE(i2c, wl1273_driver_id_table);
20
21static int wl1273_fm_read_reg(struct wl1273_core *core, u8 reg, u16 *value)
22{
23 struct i2c_client *client = core->client;
24 u8 b[2];
25 int r;
26
27 r = i2c_smbus_read_i2c_block_data(client, reg, sizeof(b), b);
28 if (r != 2) {
29 dev_err(&client->dev, "%s: Read: %d fails.\n", __func__, reg);
30 return -EREMOTEIO;
31 }
32
33 *value = (u16)b[0] << 8 | b[1];
34
35 return 0;
36}
37
38static int wl1273_fm_write_cmd(struct wl1273_core *core, u8 cmd, u16 param)
39{
40 struct i2c_client *client = core->client;
41 u8 buf[] = { (param >> 8) & 0xff, param & 0xff };
42 int r;
43
44 r = i2c_smbus_write_i2c_block_data(client, cmd, sizeof(buf), buf);
45 if (r) {
46 dev_err(&client->dev, "%s: Cmd: %d fails.\n", __func__, cmd);
47 return r;
48 }
49
50 return 0;
51}
52
53static int wl1273_fm_write_data(struct wl1273_core *core, u8 *data, u16 len)
54{
55 struct i2c_client *client = core->client;
56 struct i2c_msg msg;
57 int r;
58
59 msg.addr = client->addr;
60 msg.flags = 0;
61 msg.buf = data;
62 msg.len = len;
63
64 r = i2c_transfer(client->adapter, &msg, 1);
65 if (r != 1) {
66 dev_err(&client->dev, "%s: write error.\n", __func__);
67 return -EREMOTEIO;
68 }
69
70 return 0;
71}
72
73
74
75
76
77
78
79
80static int wl1273_fm_set_audio(struct wl1273_core *core, unsigned int new_mode)
81{
82 int r = 0;
83
84 if (core->mode == WL1273_MODE_OFF ||
85 core->mode == WL1273_MODE_SUSPENDED)
86 return -EPERM;
87
88 if (core->mode == WL1273_MODE_RX && new_mode == WL1273_AUDIO_DIGITAL) {
89 r = wl1273_fm_write_cmd(core, WL1273_PCM_MODE_SET,
90 WL1273_PCM_DEF_MODE);
91 if (r)
92 goto out;
93
94 r = wl1273_fm_write_cmd(core, WL1273_I2S_MODE_CONFIG_SET,
95 core->i2s_mode);
96 if (r)
97 goto out;
98
99 r = wl1273_fm_write_cmd(core, WL1273_AUDIO_ENABLE,
100 WL1273_AUDIO_ENABLE_I2S);
101 if (r)
102 goto out;
103
104 } else if (core->mode == WL1273_MODE_RX &&
105 new_mode == WL1273_AUDIO_ANALOG) {
106 r = wl1273_fm_write_cmd(core, WL1273_AUDIO_ENABLE,
107 WL1273_AUDIO_ENABLE_ANALOG);
108 if (r)
109 goto out;
110
111 } else if (core->mode == WL1273_MODE_TX &&
112 new_mode == WL1273_AUDIO_DIGITAL) {
113 r = wl1273_fm_write_cmd(core, WL1273_I2S_MODE_CONFIG_SET,
114 core->i2s_mode);
115 if (r)
116 goto out;
117
118 r = wl1273_fm_write_cmd(core, WL1273_AUDIO_IO_SET,
119 WL1273_AUDIO_IO_SET_I2S);
120 if (r)
121 goto out;
122
123 } else if (core->mode == WL1273_MODE_TX &&
124 new_mode == WL1273_AUDIO_ANALOG) {
125 r = wl1273_fm_write_cmd(core, WL1273_AUDIO_IO_SET,
126 WL1273_AUDIO_IO_SET_ANALOG);
127 if (r)
128 goto out;
129 }
130
131 core->audio_mode = new_mode;
132out:
133 return r;
134}
135
136
137
138
139
140
141static int wl1273_fm_set_volume(struct wl1273_core *core, unsigned int volume)
142{
143 int r;
144
145 if (volume > WL1273_MAX_VOLUME)
146 return -EINVAL;
147
148 if (core->volume == volume)
149 return 0;
150
151 r = wl1273_fm_write_cmd(core, WL1273_VOLUME_SET, volume);
152 if (r)
153 return r;
154
155 core->volume = volume;
156 return 0;
157}
158
159static int wl1273_core_probe(struct i2c_client *client,
160 const struct i2c_device_id *id)
161{
162 struct wl1273_fm_platform_data *pdata = dev_get_platdata(&client->dev);
163 struct wl1273_core *core;
164 struct mfd_cell *cell;
165 int children = 0;
166 int r = 0;
167
168 dev_dbg(&client->dev, "%s\n", __func__);
169
170 if (!pdata) {
171 dev_err(&client->dev, "No platform data.\n");
172 return -EINVAL;
173 }
174
175 if (!(pdata->children & WL1273_RADIO_CHILD)) {
176 dev_err(&client->dev, "Cannot function without radio child.\n");
177 return -EINVAL;
178 }
179
180 core = devm_kzalloc(&client->dev, sizeof(*core), GFP_KERNEL);
181 if (!core)
182 return -ENOMEM;
183
184 core->pdata = pdata;
185 core->client = client;
186 mutex_init(&core->lock);
187
188 i2c_set_clientdata(client, core);
189
190 dev_dbg(&client->dev, "%s: Have V4L2.\n", __func__);
191
192 cell = &core->cells[children];
193 cell->name = "wl1273_fm_radio";
194 cell->platform_data = &core;
195 cell->pdata_size = sizeof(core);
196 children++;
197
198 core->read = wl1273_fm_read_reg;
199 core->write = wl1273_fm_write_cmd;
200 core->write_data = wl1273_fm_write_data;
201 core->set_audio = wl1273_fm_set_audio;
202 core->set_volume = wl1273_fm_set_volume;
203
204 if (pdata->children & WL1273_CODEC_CHILD) {
205 cell = &core->cells[children];
206
207 dev_dbg(&client->dev, "%s: Have codec.\n", __func__);
208 cell->name = "wl1273-codec";
209 cell->platform_data = &core;
210 cell->pdata_size = sizeof(core);
211 children++;
212 }
213
214 dev_dbg(&client->dev, "%s: number of children: %d.\n",
215 __func__, children);
216
217 r = devm_mfd_add_devices(&client->dev, -1, core->cells,
218 children, NULL, 0, NULL);
219 if (r)
220 goto err;
221
222 return 0;
223
224err:
225 pdata->free_resources();
226
227 dev_dbg(&client->dev, "%s\n", __func__);
228
229 return r;
230}
231
232static struct i2c_driver wl1273_core_driver = {
233 .driver = {
234 .name = WL1273_FM_DRIVER_NAME,
235 },
236 .probe = wl1273_core_probe,
237 .id_table = wl1273_driver_id_table,
238};
239
240static int __init wl1273_core_init(void)
241{
242 int r;
243
244 r = i2c_add_driver(&wl1273_core_driver);
245 if (r) {
246 pr_err(WL1273_FM_DRIVER_NAME
247 ": driver registration failed\n");
248 return r;
249 }
250
251 return r;
252}
253
254static void __exit wl1273_core_exit(void)
255{
256 i2c_del_driver(&wl1273_core_driver);
257}
258late_initcall(wl1273_core_init);
259module_exit(wl1273_core_exit);
260
261MODULE_AUTHOR("Matti Aaltonen <matti.j.aaltonen@nokia.com>");
262MODULE_DESCRIPTION(DRIVER_DESC);
263MODULE_LICENSE("GPL");
264
