mfd: tps65090: fix compilation warning
[linux-2.6.git] / drivers / mfd / wl1273-core.c
1 /*
2  * MFD driver for wl1273 FM radio and audio codec submodules.
3  *
4  * Copyright (C) 2011 Nokia Corporation
5  * Author: Matti Aaltonen <matti.j.aaltonen@nokia.com>
6  *
7  * This program is free software; you can redistribute it and/or modify
8  * it under the terms of the GNU General Public License version 2 as
9  * published by the Free Software Foundation.
10  *
11  * This program is distributed in the hope that it will be useful, but
12  * WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
14  * General Public License for more details.
15  *
16  * You should have received a copy of the GNU General Public License
17  * along with this program; if not, write to the Free Software
18  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
19  * 02110-1301 USA
20  *
21  */
22
23 #include <linux/mfd/wl1273-core.h>
24 #include <linux/slab.h>
25
26 #define DRIVER_DESC "WL1273 FM Radio Core"
27
28 static const struct i2c_device_id wl1273_driver_id_table[] = {
29         { WL1273_FM_DRIVER_NAME, 0 },
30         { }
31 };
32 MODULE_DEVICE_TABLE(i2c, wl1273_driver_id_table);
33
34 static int wl1273_fm_read_reg(struct wl1273_core *core, u8 reg, u16 *value)
35 {
36         struct i2c_client *client = core->client;
37         u8 b[2];
38         int r;
39
40         r = i2c_smbus_read_i2c_block_data(client, reg, sizeof(b), b);
41         if (r != 2) {
42                 dev_err(&client->dev, "%s: Read: %d fails.\n", __func__, reg);
43                 return -EREMOTEIO;
44         }
45
46         *value = (u16)b[0] << 8 | b[1];
47
48         return 0;
49 }
50
51 static int wl1273_fm_write_cmd(struct wl1273_core *core, u8 cmd, u16 param)
52 {
53         struct i2c_client *client = core->client;
54         u8 buf[] = { (param >> 8) & 0xff, param & 0xff };
55         int r;
56
57         r = i2c_smbus_write_i2c_block_data(client, cmd, sizeof(buf), buf);
58         if (r) {
59                 dev_err(&client->dev, "%s: Cmd: %d fails.\n", __func__, cmd);
60                 return r;
61         }
62
63         return 0;
64 }
65
66 static int wl1273_fm_write_data(struct wl1273_core *core, u8 *data, u16 len)
67 {
68         struct i2c_client *client = core->client;
69         struct i2c_msg msg;
70         int r;
71
72         msg.addr = client->addr;
73         msg.flags = 0;
74         msg.buf = data;
75         msg.len = len;
76
77         r = i2c_transfer(client->adapter, &msg, 1);
78         if (r != 1) {
79                 dev_err(&client->dev, "%s: write error.\n", __func__);
80                 return -EREMOTEIO;
81         }
82
83         return 0;
84 }
85
86 /**
87  * wl1273_fm_set_audio() -      Set audio mode.
88  * @core:                       A pointer to the device struct.
89  * @new_mode:                   The new audio mode.
90  *
91  * Audio modes are WL1273_AUDIO_DIGITAL and WL1273_AUDIO_ANALOG.
92  */
93 static int wl1273_fm_set_audio(struct wl1273_core *core, unsigned int new_mode)
94 {
95         int r = 0;
96
97         if (core->mode == WL1273_MODE_OFF ||
98             core->mode == WL1273_MODE_SUSPENDED)
99                 return -EPERM;
100
101         if (core->mode == WL1273_MODE_RX && new_mode == WL1273_AUDIO_DIGITAL) {
102                 r = wl1273_fm_write_cmd(core, WL1273_PCM_MODE_SET,
103                                         WL1273_PCM_DEF_MODE);
104                 if (r)
105                         goto out;
106
107                 r = wl1273_fm_write_cmd(core, WL1273_I2S_MODE_CONFIG_SET,
108                                         core->i2s_mode);
109                 if (r)
110                         goto out;
111
112                 r = wl1273_fm_write_cmd(core, WL1273_AUDIO_ENABLE,
113                                         WL1273_AUDIO_ENABLE_I2S);
114                 if (r)
115                         goto out;
116
117         } else if (core->mode == WL1273_MODE_RX &&
118                    new_mode == WL1273_AUDIO_ANALOG) {
119                 r = wl1273_fm_write_cmd(core, WL1273_AUDIO_ENABLE,
120                                         WL1273_AUDIO_ENABLE_ANALOG);
121                 if (r)
122                         goto out;
123
124         } else if (core->mode == WL1273_MODE_TX &&
125                    new_mode == WL1273_AUDIO_DIGITAL) {
126                 r = wl1273_fm_write_cmd(core, WL1273_I2S_MODE_CONFIG_SET,
127                                         core->i2s_mode);
128                 if (r)
129                         goto out;
130
131                 r = wl1273_fm_write_cmd(core, WL1273_AUDIO_IO_SET,
132                                         WL1273_AUDIO_IO_SET_I2S);
133                 if (r)
134                         goto out;
135
136         } else if (core->mode == WL1273_MODE_TX &&
137                    new_mode == WL1273_AUDIO_ANALOG) {
138                 r = wl1273_fm_write_cmd(core, WL1273_AUDIO_IO_SET,
139                                         WL1273_AUDIO_IO_SET_ANALOG);
140                 if (r)
141                         goto out;
142         }
143
144         core->audio_mode = new_mode;
145 out:
146         return r;
147 }
148
149 /**
150  * wl1273_fm_set_volume() -     Set volume.
151  * @core:                       A pointer to the device struct.
152  * @volume:                     The new volume value.
153  */
154 static int wl1273_fm_set_volume(struct wl1273_core *core, unsigned int volume)
155 {
156         int r;
157
158         if (volume > WL1273_MAX_VOLUME)
159                 return -EINVAL;
160
161         if (core->volume == volume)
162                 return 0;
163
164         r = wl1273_fm_write_cmd(core, WL1273_VOLUME_SET, volume);
165         if (r)
166                 return r;
167
168         core->volume = volume;
169         return 0;
170 }
171
172 static int wl1273_core_remove(struct i2c_client *client)
173 {
174         struct wl1273_core *core = i2c_get_clientdata(client);
175
176         dev_dbg(&client->dev, "%s\n", __func__);
177
178         mfd_remove_devices(&client->dev);
179         kfree(core);
180
181         return 0;
182 }
183
184 static int __devinit wl1273_core_probe(struct i2c_client *client,
185                                        const struct i2c_device_id *id)
186 {
187         struct wl1273_fm_platform_data *pdata = client->dev.platform_data;
188         struct wl1273_core *core;
189         struct mfd_cell *cell;
190         int children = 0;
191         int r = 0;
192
193         dev_dbg(&client->dev, "%s\n", __func__);
194
195         if (!pdata) {
196                 dev_err(&client->dev, "No platform data.\n");
197                 return -EINVAL;
198         }
199
200         if (!(pdata->children & WL1273_RADIO_CHILD)) {
201                 dev_err(&client->dev, "Cannot function without radio child.\n");
202                 return -EINVAL;
203         }
204
205         core = kzalloc(sizeof(*core), GFP_KERNEL);
206         if (!core)
207                 return -ENOMEM;
208
209         core->pdata = pdata;
210         core->client = client;
211         mutex_init(&core->lock);
212
213         i2c_set_clientdata(client, core);
214
215         dev_dbg(&client->dev, "%s: Have V4L2.\n", __func__);
216
217         cell = &core->cells[children];
218         cell->name = "wl1273_fm_radio";
219         cell->platform_data = &core;
220         cell->pdata_size = sizeof(core);
221         children++;
222
223         core->read = wl1273_fm_read_reg;
224         core->write = wl1273_fm_write_cmd;
225         core->write_data = wl1273_fm_write_data;
226         core->set_audio = wl1273_fm_set_audio;
227         core->set_volume = wl1273_fm_set_volume;
228
229         if (pdata->children & WL1273_CODEC_CHILD) {
230                 cell = &core->cells[children];
231
232                 dev_dbg(&client->dev, "%s: Have codec.\n", __func__);
233                 cell->name = "wl1273-codec";
234                 cell->platform_data = &core;
235                 cell->pdata_size = sizeof(core);
236                 children++;
237         }
238
239         dev_dbg(&client->dev, "%s: number of children: %d.\n",
240                 __func__, children);
241
242         r = mfd_add_devices(&client->dev, -1, core->cells,
243                             children, NULL, 0);
244         if (r)
245                 goto err;
246
247         return 0;
248
249 err:
250         pdata->free_resources();
251         kfree(core);
252
253         dev_dbg(&client->dev, "%s\n", __func__);
254
255         return r;
256 }
257
258 static struct i2c_driver wl1273_core_driver = {
259         .driver = {
260                 .name = WL1273_FM_DRIVER_NAME,
261         },
262         .probe = wl1273_core_probe,
263         .id_table = wl1273_driver_id_table,
264         .remove = __devexit_p(wl1273_core_remove),
265 };
266
267 static int __init wl1273_core_init(void)
268 {
269         int r;
270
271         r = i2c_add_driver(&wl1273_core_driver);
272         if (r) {
273                 pr_err(WL1273_FM_DRIVER_NAME
274                        ": driver registration failed\n");
275                 return r;
276         }
277
278         return r;
279 }
280
281 static void __exit wl1273_core_exit(void)
282 {
283         i2c_del_driver(&wl1273_core_driver);
284 }
285 late_initcall(wl1273_core_init);
286 module_exit(wl1273_core_exit);
287
288 MODULE_AUTHOR("Matti Aaltonen <matti.j.aaltonen@nokia.com>");
289 MODULE_DESCRIPTION(DRIVER_DESC);
290 MODULE_LICENSE("GPL");