1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * MFD driver for wl1273 FM radio and audio codec submodules.
4 *
5 * Copyright (C) 2011 Nokia Corporation
6 * Author: Matti Aaltonen <matti.j.aaltonen@nokia.com>
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
15 static const struct i2c_device_id wl1273_driver_id_table[] = {
16 { WL1273_FM_DRIVER_NAME },
17 { }
18 };
19 MODULE_DEVICE_TABLE(i2c, wl1273_driver_id_table);
20
wl1273_fm_read_reg(struct wl1273_core * core,u8 reg,u16 * value)21 static 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
wl1273_fm_write_cmd(struct wl1273_core * core,u8 cmd,u16 param)38 static 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
wl1273_fm_write_data(struct wl1273_core * core,u8 * data,u16 len)53 static 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 * wl1273_fm_set_audio() - Set audio mode.
75 * @core: A pointer to the device struct.
76 * @new_mode: The new audio mode.
77 *
78 * Audio modes are WL1273_AUDIO_DIGITAL and WL1273_AUDIO_ANALOG.
79 */
wl1273_fm_set_audio(struct wl1273_core * core,unsigned int new_mode)80 static 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;
132 out:
133 return r;
134 }
135
136 /**
137 * wl1273_fm_set_volume() - Set volume.
138 * @core: A pointer to the device struct.
139 * @volume: The new volume value.
140 */
wl1273_fm_set_volume(struct wl1273_core * core,unsigned int volume)141 static 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
wl1273_core_probe(struct i2c_client * client)159 static int wl1273_core_probe(struct i2c_client *client)
160 {
161 struct wl1273_fm_platform_data *pdata = dev_get_platdata(&client->dev);
162 struct wl1273_core *core;
163 struct mfd_cell *cell;
164 int children = 0;
165 int r = 0;
166
167 dev_dbg(&client->dev, "%s\n", __func__);
168
169 if (!pdata) {
170 dev_err(&client->dev, "No platform data.\n");
171 return -EINVAL;
172 }
173
174 if (!(pdata->children & WL1273_RADIO_CHILD)) {
175 dev_err(&client->dev, "Cannot function without radio child.\n");
176 return -EINVAL;
177 }
178
179 core = devm_kzalloc(&client->dev, sizeof(*core), GFP_KERNEL);
180 if (!core)
181 return -ENOMEM;
182
183 core->pdata = pdata;
184 core->client = client;
185 mutex_init(&core->lock);
186
187 i2c_set_clientdata(client, core);
188
189 dev_dbg(&client->dev, "%s: Have V4L2.\n", __func__);
190
191 cell = &core->cells[children];
192 cell->name = "wl1273_fm_radio";
193 cell->platform_data = &core;
194 cell->pdata_size = sizeof(core);
195 children++;
196
197 core->read = wl1273_fm_read_reg;
198 core->write = wl1273_fm_write_cmd;
199 core->write_data = wl1273_fm_write_data;
200 core->set_audio = wl1273_fm_set_audio;
201 core->set_volume = wl1273_fm_set_volume;
202
203 if (pdata->children & WL1273_CODEC_CHILD) {
204 cell = &core->cells[children];
205
206 dev_dbg(&client->dev, "%s: Have codec.\n", __func__);
207 cell->name = "wl1273-codec";
208 cell->platform_data = &core;
209 cell->pdata_size = sizeof(core);
210 children++;
211 }
212
213 dev_dbg(&client->dev, "%s: number of children: %d.\n",
214 __func__, children);
215
216 r = devm_mfd_add_devices(&client->dev, -1, core->cells,
217 children, NULL, 0, NULL);
218 if (r)
219 goto err;
220
221 return 0;
222
223 err:
224 pdata->free_resources();
225
226 dev_dbg(&client->dev, "%s\n", __func__);
227
228 return r;
229 }
230
231 static struct i2c_driver wl1273_core_driver = {
232 .driver = {
233 .name = WL1273_FM_DRIVER_NAME,
234 },
235 .probe = wl1273_core_probe,
236 .id_table = wl1273_driver_id_table,
237 };
238
wl1273_core_init(void)239 static int __init wl1273_core_init(void)
240 {
241 int r;
242
243 r = i2c_add_driver(&wl1273_core_driver);
244 if (r) {
245 pr_err(WL1273_FM_DRIVER_NAME
246 ": driver registration failed\n");
247 return r;
248 }
249
250 return r;
251 }
252
wl1273_core_exit(void)253 static void __exit wl1273_core_exit(void)
254 {
255 i2c_del_driver(&wl1273_core_driver);
256 }
257 late_initcall(wl1273_core_init);
258 module_exit(wl1273_core_exit);
259
260 MODULE_AUTHOR("Matti Aaltonen <matti.j.aaltonen@nokia.com>");
261 MODULE_DESCRIPTION(DRIVER_DESC);
262 MODULE_LICENSE("GPL");
263