1 /* 2 * MFD driver for wl1273 FM radio and audio codec submodules. 3 * 4 * Copyright (C) 2010 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 26 #define DRIVER_DESC "WL1273 FM Radio Core" 27 28 static struct i2c_device_id wl1273_driver_id_table[] = { 29 { WL1273_FM_DRIVER_NAME, 0 }, 30 { } 31 }; 32 MODULE_DEVICE_TABLE(i2c, wl1273_driver_id_table); 33 34 static int wl1273_core_remove(struct i2c_client *client) 35 { 36 struct wl1273_core *core = i2c_get_clientdata(client); 37 38 dev_dbg(&client->dev, "%s\n", __func__); 39 40 mfd_remove_devices(&client->dev); 41 i2c_set_clientdata(client, NULL); 42 kfree(core); 43 44 return 0; 45 } 46 47 static int __devinit wl1273_core_probe(struct i2c_client *client, 48 const struct i2c_device_id *id) 49 { 50 struct wl1273_fm_platform_data *pdata = client->dev.platform_data; 51 struct wl1273_core *core; 52 struct mfd_cell *cell; 53 int children = 0; 54 int r = 0; 55 56 dev_dbg(&client->dev, "%s\n", __func__); 57 58 if (!pdata) { 59 dev_err(&client->dev, "No platform data.\n"); 60 return -EINVAL; 61 } 62 63 if (!(pdata->children & WL1273_RADIO_CHILD)) { 64 dev_err(&client->dev, "Cannot function without radio child.\n"); 65 return -EINVAL; 66 } 67 68 core = kzalloc(sizeof(*core), GFP_KERNEL); 69 if (!core) 70 return -ENOMEM; 71 72 core->pdata = pdata; 73 core->client = client; 74 mutex_init(&core->lock); 75 76 i2c_set_clientdata(client, core); 77 78 dev_dbg(&client->dev, "%s: Have V4L2.\n", __func__); 79 80 cell = &core->cells[children]; 81 cell->name = "wl1273_fm_radio"; 82 cell->platform_data = &core; 83 cell->data_size = sizeof(core); 84 children++; 85 86 if (pdata->children & WL1273_CODEC_CHILD) { 87 cell = &core->cells[children]; 88 89 dev_dbg(&client->dev, "%s: Have codec.\n", __func__); 90 cell->name = "wl1273-codec"; 91 cell->platform_data = &core; 92 cell->data_size = sizeof(core); 93 children++; 94 } 95 96 dev_dbg(&client->dev, "%s: number of children: %d.\n", 97 __func__, children); 98 99 r = mfd_add_devices(&client->dev, -1, core->cells, 100 children, NULL, 0); 101 if (r) 102 goto err; 103 104 return 0; 105 106 err: 107 i2c_set_clientdata(client, NULL); 108 pdata->free_resources(); 109 kfree(core); 110 111 dev_dbg(&client->dev, "%s\n", __func__); 112 113 return r; 114 } 115 116 static struct i2c_driver wl1273_core_driver = { 117 .driver = { 118 .name = WL1273_FM_DRIVER_NAME, 119 }, 120 .probe = wl1273_core_probe, 121 .id_table = wl1273_driver_id_table, 122 .remove = __devexit_p(wl1273_core_remove), 123 }; 124 125 static int __init wl1273_core_init(void) 126 { 127 int r; 128 129 r = i2c_add_driver(&wl1273_core_driver); 130 if (r) { 131 pr_err(WL1273_FM_DRIVER_NAME 132 ": driver registration failed\n"); 133 return r; 134 } 135 136 return r; 137 } 138 139 static void __exit wl1273_core_exit(void) 140 { 141 i2c_del_driver(&wl1273_core_driver); 142 } 143 late_initcall(wl1273_core_init); 144 module_exit(wl1273_core_exit); 145 146 MODULE_AUTHOR("Matti Aaltonen <matti.j.aaltonen@nokia.com>"); 147 MODULE_DESCRIPTION(DRIVER_DESC); 148 MODULE_LICENSE("GPL"); 149