NFSv4: The NFSv4.0 client must send RENEW calls if it holds a delegation
[linux/fpc-iii.git] / drivers / mfd / wl1273-core.c
blobd97a86945174519a6d333bf0527875b63537384d
1 /*
2 * MFD driver for wl1273 FM radio and audio codec submodules.
4 * Copyright (C) 2011 Nokia Corporation
5 * Author: Matti Aaltonen <matti.j.aaltonen@nokia.com>
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.
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.
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
23 #include <linux/mfd/wl1273-core.h>
24 #include <linux/slab.h>
26 #define DRIVER_DESC "WL1273 FM Radio Core"
28 static const struct i2c_device_id wl1273_driver_id_table[] = {
29 { WL1273_FM_DRIVER_NAME, 0 },
30 { }
32 MODULE_DEVICE_TABLE(i2c, wl1273_driver_id_table);
34 static int wl1273_fm_read_reg(struct wl1273_core *core, u8 reg, u16 *value)
36 struct i2c_client *client = core->client;
37 u8 b[2];
38 int r;
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;
46 *value = (u16)b[0] << 8 | b[1];
48 return 0;
51 static int wl1273_fm_write_cmd(struct wl1273_core *core, u8 cmd, u16 param)
53 struct i2c_client *client = core->client;
54 u8 buf[] = { (param >> 8) & 0xff, param & 0xff };
55 int r;
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;
63 return 0;
66 static int wl1273_fm_write_data(struct wl1273_core *core, u8 *data, u16 len)
68 struct i2c_client *client = core->client;
69 struct i2c_msg msg;
70 int r;
72 msg.addr = client->addr;
73 msg.flags = 0;
74 msg.buf = data;
75 msg.len = len;
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;
83 return 0;
86 /**
87 * wl1273_fm_set_audio() - Set audio mode.
88 * @core: A pointer to the device struct.
89 * @new_mode: The new audio mode.
91 * Audio modes are WL1273_AUDIO_DIGITAL and WL1273_AUDIO_ANALOG.
93 static int wl1273_fm_set_audio(struct wl1273_core *core, unsigned int new_mode)
95 int r = 0;
97 if (core->mode == WL1273_MODE_OFF ||
98 core->mode == WL1273_MODE_SUSPENDED)
99 return -EPERM;
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;
107 r = wl1273_fm_write_cmd(core, WL1273_I2S_MODE_CONFIG_SET,
108 core->i2s_mode);
109 if (r)
110 goto out;
112 r = wl1273_fm_write_cmd(core, WL1273_AUDIO_ENABLE,
113 WL1273_AUDIO_ENABLE_I2S);
114 if (r)
115 goto out;
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;
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;
131 r = wl1273_fm_write_cmd(core, WL1273_AUDIO_IO_SET,
132 WL1273_AUDIO_IO_SET_I2S);
133 if (r)
134 goto out;
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;
144 core->audio_mode = new_mode;
145 out:
146 return r;
150 * wl1273_fm_set_volume() - Set volume.
151 * @core: A pointer to the device struct.
152 * @volume: The new volume value.
154 static int wl1273_fm_set_volume(struct wl1273_core *core, unsigned int volume)
156 int r;
158 if (volume > WL1273_MAX_VOLUME)
159 return -EINVAL;
161 if (core->volume == volume)
162 return 0;
164 r = wl1273_fm_write_cmd(core, WL1273_VOLUME_SET, volume);
165 if (r)
166 return r;
168 core->volume = volume;
169 return 0;
172 static int wl1273_core_remove(struct i2c_client *client)
174 struct wl1273_core *core = i2c_get_clientdata(client);
176 dev_dbg(&client->dev, "%s\n", __func__);
178 mfd_remove_devices(&client->dev);
179 kfree(core);
181 return 0;
184 static int __devinit wl1273_core_probe(struct i2c_client *client,
185 const struct i2c_device_id *id)
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;
193 dev_dbg(&client->dev, "%s\n", __func__);
195 if (!pdata) {
196 dev_err(&client->dev, "No platform data.\n");
197 return -EINVAL;
200 if (!(pdata->children & WL1273_RADIO_CHILD)) {
201 dev_err(&client->dev, "Cannot function without radio child.\n");
202 return -EINVAL;
205 core = kzalloc(sizeof(*core), GFP_KERNEL);
206 if (!core)
207 return -ENOMEM;
209 core->pdata = pdata;
210 core->client = client;
211 mutex_init(&core->lock);
213 i2c_set_clientdata(client, core);
215 dev_dbg(&client->dev, "%s: Have V4L2.\n", __func__);
217 cell = &core->cells[children];
218 cell->name = "wl1273_fm_radio";
219 cell->platform_data = &core;
220 cell->pdata_size = sizeof(core);
221 children++;
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;
229 if (pdata->children & WL1273_CODEC_CHILD) {
230 cell = &core->cells[children];
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++;
239 dev_dbg(&client->dev, "%s: number of children: %d.\n",
240 __func__, children);
242 r = mfd_add_devices(&client->dev, -1, core->cells,
243 children, NULL, 0);
244 if (r)
245 goto err;
247 return 0;
249 err:
250 pdata->free_resources();
251 kfree(core);
253 dev_dbg(&client->dev, "%s\n", __func__);
255 return r;
258 static struct i2c_driver wl1273_core_driver = {
259 .driver = {
260 .name = WL1273_FM_DRIVER_NAME,
262 .probe = wl1273_core_probe,
263 .id_table = wl1273_driver_id_table,
264 .remove = __devexit_p(wl1273_core_remove),
267 static int __init wl1273_core_init(void)
269 int r;
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;
278 return r;
281 static void __exit wl1273_core_exit(void)
283 i2c_del_driver(&wl1273_core_driver);
285 late_initcall(wl1273_core_init);
286 module_exit(wl1273_core_exit);
288 MODULE_AUTHOR("Matti Aaltonen <matti.j.aaltonen@nokia.com>");
289 MODULE_DESCRIPTION(DRIVER_DESC);
290 MODULE_LICENSE("GPL");