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 29 static const struct i2c_device_id wl1273_driver_id_table[] = { 30 { WL1273_FM_DRIVER_NAME, 0 }, 31 { } 32 }; 33 MODULE_DEVICE_TABLE(i2c, wl1273_driver_id_table); 34 35 static 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 52 static 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 67 static 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 */ 94 static 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; 146 out: 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 */ 155 static 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 } 172 173 static 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; 237 238 err: 239 pdata->free_resources(); 240 241 dev_dbg(&client->dev, "%s\n", __func__); 242 243 return r; 244 } 245 246 static 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 }; 253 254 static 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 } 267 268 static void __exit wl1273_core_exit(void) 269 { 270 i2c_del_driver(&wl1273_core_driver); 271 } 272 late_initcall(wl1273_core_init); 273 module_exit(wl1273_core_exit); 274 275 MODULE_AUTHOR("Matti Aaltonen <matti.j.aaltonen@nokia.com>"); 276 MODULE_DESCRIPTION(DRIVER_DESC); 277 MODULE_LICENSE("GPL"); 278