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#include <linux/module.h>
26
27#define DRIVER_DESC "WL1273 FM Radio Core"
28
29static const struct i2c_device_id wl1273_driver_id_table[] = {
30 { WL1273_FM_DRIVER_NAME, 0 },
31 { }
32};
33MODULE_DEVICE_TABLE(i2c, wl1273_driver_id_table);
34
35static int wl1273_fm_read_reg(struct wl1273_core *core, u8 reg, u16 *value)
36{
37 struct i2c_client *client = core->client;
38 u8 b[2];
39 int r;
40
41 r = i2c_smbus_read_i2c_block_data(client, reg, sizeof(b), b);
42 if (r != 2) {
43 dev_err(&client->dev, "%s: Read: %d fails.\n", __func__, reg);
44 return -EREMOTEIO;
45 }
46
47 *value = (u16)b[0] << 8 | b[1];
48
49 return 0;
50}
51
52static int wl1273_fm_write_cmd(struct wl1273_core *core, u8 cmd, u16 param)
53{
54 struct i2c_client *client = core->client;
55 u8 buf[] = { (param >> 8) & 0xff, param & 0xff };
56 int r;
57
58 r = i2c_smbus_write_i2c_block_data(client, cmd, sizeof(buf), buf);
59 if (r) {
60 dev_err(&client->dev, "%s: Cmd: %d fails.\n", __func__, cmd);
61 return r;
62 }
63
64 return 0;
65}
66
67static int wl1273_fm_write_data(struct wl1273_core *core, u8 *data, u16 len)
68{
69 struct i2c_client *client = core->client;
70 struct i2c_msg msg;
71 int r;
72
73 msg.addr = client->addr;
74 msg.flags = 0;
75 msg.buf = data;
76 msg.len = len;
77
78 r = i2c_transfer(client->adapter, &msg, 1);
79 if (r != 1) {
80 dev_err(&client->dev, "%s: write error.\n", __func__);
81 return -EREMOTEIO;
82 }
83
84 return 0;
85}
86
87/**
88 * wl1273_fm_set_audio() - Set audio mode.
89 * @core: A pointer to the device struct.
90 * @new_mode: The new audio mode.
91 *
92 * Audio modes are WL1273_AUDIO_DIGITAL and WL1273_AUDIO_ANALOG.
93 */
94static int wl1273_fm_set_audio(struct wl1273_core *core, unsigned int new_mode)
95{
96 int r = 0;
97
98 if (core->mode == WL1273_MODE_OFF ||
99 core->mode == WL1273_MODE_SUSPENDED)
100 return -EPERM;
101
102 if (core->mode == WL1273_MODE_RX && new_mode == WL1273_AUDIO_DIGITAL) {
103 r = wl1273_fm_write_cmd(core, WL1273_PCM_MODE_SET,
104 WL1273_PCM_DEF_MODE);
105 if (r)
106 goto out;
107
108 r = wl1273_fm_write_cmd(core, WL1273_I2S_MODE_CONFIG_SET,
109 core->i2s_mode);
110 if (r)
111 goto out;
112
113 r = wl1273_fm_write_cmd(core, WL1273_AUDIO_ENABLE,
114 WL1273_AUDIO_ENABLE_I2S);
115 if (r)
116 goto out;
117
118 } else if (core->mode == WL1273_MODE_RX &&
119 new_mode == WL1273_AUDIO_ANALOG) {
120 r = wl1273_fm_write_cmd(core, WL1273_AUDIO_ENABLE,
121 WL1273_AUDIO_ENABLE_ANALOG);
122 if (r)
123 goto out;
124
125 } else if (core->mode == WL1273_MODE_TX &&
126 new_mode == WL1273_AUDIO_DIGITAL) {
127 r = wl1273_fm_write_cmd(core, WL1273_I2S_MODE_CONFIG_SET,
128 core->i2s_mode);
129 if (r)
130 goto out;
131
132 r = wl1273_fm_write_cmd(core, WL1273_AUDIO_IO_SET,
133 WL1273_AUDIO_IO_SET_I2S);
134 if (r)
135 goto out;
136
137 } else if (core->mode == WL1273_MODE_TX &&
138 new_mode == WL1273_AUDIO_ANALOG) {
139 r = wl1273_fm_write_cmd(core, WL1273_AUDIO_IO_SET,
140 WL1273_AUDIO_IO_SET_ANALOG);
141 if (r)
142 goto out;
143 }
144
145 core->audio_mode = new_mode;
146out:
147 return r;
148}
149
150/**
151 * wl1273_fm_set_volume() - Set volume.
152 * @core: A pointer to the device struct.
153 * @volume: The new volume value.
154 */
155static int wl1273_fm_set_volume(struct wl1273_core *core, unsigned int volume)
156{
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
173static int wl1273_core_probe(struct i2c_client *client,
174 const struct i2c_device_id *id)
175{
176 struct wl1273_fm_platform_data *pdata = dev_get_platdata(&client->dev);
177 struct wl1273_core *core;
178 struct mfd_cell *cell;
179 int children = 0;
180 int r = 0;
181
182 dev_dbg(&client->dev, "%s\n", __func__);
183
184 if (!pdata) {
185 dev_err(&client->dev, "No platform data.\n");
186 return -EINVAL;
187 }
188
189 if (!(pdata->children & WL1273_RADIO_CHILD)) {
190 dev_err(&client->dev, "Cannot function without radio child.\n");
191 return -EINVAL;
192 }
193
194 core = devm_kzalloc(&client->dev, sizeof(*core), GFP_KERNEL);
195 if (!core)
196 return -ENOMEM;
197
198 core->pdata = pdata;
199 core->client = client;
200 mutex_init(&core->lock);
201
202 i2c_set_clientdata(client, core);
203
204 dev_dbg(&client->dev, "%s: Have V4L2.\n", __func__);
205
206 cell = &core->cells[children];
207 cell->name = "wl1273_fm_radio";
208 cell->platform_data = &core;
209 cell->pdata_size = sizeof(core);
210 children++;
211
212 core->read = wl1273_fm_read_reg;
213 core->write = wl1273_fm_write_cmd;
214 core->write_data = wl1273_fm_write_data;
215 core->set_audio = wl1273_fm_set_audio;
216 core->set_volume = wl1273_fm_set_volume;
217
218 if (pdata->children & WL1273_CODEC_CHILD) {
219 cell = &core->cells[children];
220
221 dev_dbg(&client->dev, "%s: Have codec.\n", __func__);
222 cell->name = "wl1273-codec";
223 cell->platform_data = &core;
224 cell->pdata_size = sizeof(core);
225 children++;
226 }
227
228 dev_dbg(&client->dev, "%s: number of children: %d.\n",
229 __func__, children);
230
231 r = devm_mfd_add_devices(&client->dev, -1, core->cells,
232 children, NULL, 0, NULL);
233 if (r)
234 goto err;
235
236 return 0;
237
238err:
239 pdata->free_resources();
240
241 dev_dbg(&client->dev, "%s\n", __func__);
242
243 return r;
244}
245
246static struct i2c_driver wl1273_core_driver = {
247 .driver = {
248 .name = WL1273_FM_DRIVER_NAME,
249 },
250 .probe = wl1273_core_probe,
251 .id_table = wl1273_driver_id_table,
252};
253
254static int __init wl1273_core_init(void)
255{
256 int r;
257
258 r = i2c_add_driver(&wl1273_core_driver);
259 if (r) {
260 pr_err(WL1273_FM_DRIVER_NAME
261 ": driver registration failed\n");
262 return r;
263 }
264
265 return r;
266}
267
268static void __exit wl1273_core_exit(void)
269{
270 i2c_del_driver(&wl1273_core_driver);
271}
272late_initcall(wl1273_core_init);
273module_exit(wl1273_core_exit);
274
275MODULE_AUTHOR("Matti Aaltonen <matti.j.aaltonen@nokia.com>");
276MODULE_DESCRIPTION(DRIVER_DESC);
277MODULE_LICENSE("GPL");
278