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Matti Aaltonen383268a2010-12-10 11:41:33 -03001/*
2 * MFD driver for wl1273 FM radio and audio codec submodules.
3 *
Matti Aaltonen94fd5b72011-03-01 10:10:35 -03004 * Copyright (C) 2011 Nokia Corporation
Matti Aaltonen383268a2010-12-10 11:41:33 -03005 * 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
Axel Lin12065522011-03-23 20:54:17 +080028static const struct i2c_device_id wl1273_driver_id_table[] = {
Matti Aaltonen383268a2010-12-10 11:41:33 -030029 { WL1273_FM_DRIVER_NAME, 0 },
30 { }
31};
32MODULE_DEVICE_TABLE(i2c, wl1273_driver_id_table);
33
Matti Aaltonen94fd5b72011-03-01 10:10:35 -030034static 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
51static 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
66static 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 */
93static 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;
145out:
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 */
154static int wl1273_fm_set_volume(struct wl1273_core *core, unsigned int volume)
155{
156 u16 val;
157 int r;
158
159 if (volume > WL1273_MAX_VOLUME)
160 return -EINVAL;
161
162 if (core->volume == volume)
163 return 0;
164
165 r = wl1273_fm_write_cmd(core, WL1273_VOLUME_SET, volume);
166 if (r)
167 return r;
168
169 core->volume = volume;
170 return 0;
171}
172
Matti Aaltonen383268a2010-12-10 11:41:33 -0300173static int wl1273_core_remove(struct i2c_client *client)
174{
175 struct wl1273_core *core = i2c_get_clientdata(client);
176
177 dev_dbg(&client->dev, "%s\n", __func__);
178
179 mfd_remove_devices(&client->dev);
Matti Aaltonen383268a2010-12-10 11:41:33 -0300180 kfree(core);
181
182 return 0;
183}
184
185static int __devinit wl1273_core_probe(struct i2c_client *client,
186 const struct i2c_device_id *id)
187{
188 struct wl1273_fm_platform_data *pdata = client->dev.platform_data;
189 struct wl1273_core *core;
190 struct mfd_cell *cell;
191 int children = 0;
192 int r = 0;
193
194 dev_dbg(&client->dev, "%s\n", __func__);
195
196 if (!pdata) {
197 dev_err(&client->dev, "No platform data.\n");
198 return -EINVAL;
199 }
200
201 if (!(pdata->children & WL1273_RADIO_CHILD)) {
202 dev_err(&client->dev, "Cannot function without radio child.\n");
203 return -EINVAL;
204 }
205
206 core = kzalloc(sizeof(*core), GFP_KERNEL);
207 if (!core)
208 return -ENOMEM;
209
210 core->pdata = pdata;
211 core->client = client;
212 mutex_init(&core->lock);
213
214 i2c_set_clientdata(client, core);
215
216 dev_dbg(&client->dev, "%s: Have V4L2.\n", __func__);
217
218 cell = &core->cells[children];
219 cell->name = "wl1273_fm_radio";
Andres Salomon65e52352011-02-17 19:07:25 -0800220 cell->mfd_data = &core;
Matti Aaltonen383268a2010-12-10 11:41:33 -0300221 children++;
222
Matti Aaltonen94fd5b72011-03-01 10:10:35 -0300223 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
Matti Aaltonen383268a2010-12-10 11:41:33 -0300229 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";
Andres Salomon65e52352011-02-17 19:07:25 -0800234 cell->mfd_data = &core;
Matti Aaltonen383268a2010-12-10 11:41:33 -0300235 children++;
236 }
237
238 dev_dbg(&client->dev, "%s: number of children: %d.\n",
239 __func__, children);
240
241 r = mfd_add_devices(&client->dev, -1, core->cells,
242 children, NULL, 0);
243 if (r)
244 goto err;
245
246 return 0;
247
248err:
Matti Aaltonen383268a2010-12-10 11:41:33 -0300249 pdata->free_resources();
250 kfree(core);
251
252 dev_dbg(&client->dev, "%s\n", __func__);
253
254 return r;
255}
256
257static struct i2c_driver wl1273_core_driver = {
258 .driver = {
259 .name = WL1273_FM_DRIVER_NAME,
260 },
261 .probe = wl1273_core_probe,
262 .id_table = wl1273_driver_id_table,
263 .remove = __devexit_p(wl1273_core_remove),
264};
265
266static int __init wl1273_core_init(void)
267{
268 int r;
269
270 r = i2c_add_driver(&wl1273_core_driver);
271 if (r) {
272 pr_err(WL1273_FM_DRIVER_NAME
273 ": driver registration failed\n");
274 return r;
275 }
276
277 return r;
278}
279
280static void __exit wl1273_core_exit(void)
281{
282 i2c_del_driver(&wl1273_core_driver);
283}
284late_initcall(wl1273_core_init);
285module_exit(wl1273_core_exit);
286
287MODULE_AUTHOR("Matti Aaltonen <matti.j.aaltonen@nokia.com>");
288MODULE_DESCRIPTION(DRIVER_DESC);
289MODULE_LICENSE("GPL");