1 /* 2 * drivers/media/radio/radio-si4713.c 3 * 4 * Platform Driver for Silicon Labs Si4713 FM Radio Transmitter: 5 * 6 * Copyright (c) 2008 Instituto Nokia de Tecnologia - INdT 7 * Contact: Eduardo Valentin <eduardo.valentin@nokia.com> 8 * 9 * This program is free software; you can redistribute it and/or modify 10 * it under the terms of the GNU General Public License as published by 11 * the Free Software Foundation; either version 2 of the License, or 12 * (at your option) any later version. 13 * 14 * This program is distributed in the hope that it will be useful, 15 * but WITHOUT ANY WARRANTY; without even the implied warranty of 16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 17 * GNU General Public License for more details. 18 * 19 * You should have received a copy of the GNU General Public License 20 * along with this program; if not, write to the Free Software 21 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 22 */ 23 24 #include <linux/kernel.h> 25 #include <linux/module.h> 26 #include <linux/init.h> 27 #include <linux/platform_device.h> 28 #include <linux/i2c.h> 29 #include <linux/videodev2.h> 30 #include <linux/slab.h> 31 #include <media/v4l2-device.h> 32 #include <media/v4l2-common.h> 33 #include <media/v4l2-ioctl.h> 34 #include <media/v4l2-fh.h> 35 #include <media/v4l2-ctrls.h> 36 #include <media/v4l2-event.h> 37 #include "si4713.h" 38 39 /* module parameters */ 40 static int radio_nr = -1; /* radio device minor (-1 ==> auto assign) */ 41 module_param(radio_nr, int, 0); 42 MODULE_PARM_DESC(radio_nr, 43 "Minor number for radio device (-1 ==> auto assign)"); 44 45 MODULE_LICENSE("GPL v2"); 46 MODULE_AUTHOR("Eduardo Valentin <eduardo.valentin@nokia.com>"); 47 MODULE_DESCRIPTION("Platform driver for Si4713 FM Radio Transmitter"); 48 MODULE_VERSION("0.0.1"); 49 MODULE_ALIAS("platform:radio-si4713"); 50 51 /* Driver state struct */ 52 struct radio_si4713_device { 53 struct v4l2_device v4l2_dev; 54 struct video_device radio_dev; 55 struct mutex lock; 56 }; 57 58 /* radio_si4713_fops - file operations interface */ 59 static const struct v4l2_file_operations radio_si4713_fops = { 60 .owner = THIS_MODULE, 61 .open = v4l2_fh_open, 62 .release = v4l2_fh_release, 63 .poll = v4l2_ctrl_poll, 64 /* Note: locking is done at the subdev level in the i2c driver. */ 65 .unlocked_ioctl = video_ioctl2, 66 }; 67 68 /* Video4Linux Interface */ 69 70 /* radio_si4713_querycap - query device capabilities */ 71 static int radio_si4713_querycap(struct file *file, void *priv, 72 struct v4l2_capability *capability) 73 { 74 strlcpy(capability->driver, "radio-si4713", sizeof(capability->driver)); 75 strlcpy(capability->card, "Silicon Labs Si4713 Modulator", 76 sizeof(capability->card)); 77 strlcpy(capability->bus_info, "platform:radio-si4713", 78 sizeof(capability->bus_info)); 79 capability->device_caps = V4L2_CAP_MODULATOR | V4L2_CAP_RDS_OUTPUT; 80 capability->capabilities = capability->device_caps | V4L2_CAP_DEVICE_CAPS; 81 82 return 0; 83 } 84 85 /* 86 * v4l2 ioctl call backs. 87 * we are just a wrapper for v4l2_sub_devs. 88 */ 89 static inline struct v4l2_device *get_v4l2_dev(struct file *file) 90 { 91 return &((struct radio_si4713_device *)video_drvdata(file))->v4l2_dev; 92 } 93 94 static int radio_si4713_g_modulator(struct file *file, void *p, 95 struct v4l2_modulator *vm) 96 { 97 return v4l2_device_call_until_err(get_v4l2_dev(file), 0, tuner, 98 g_modulator, vm); 99 } 100 101 static int radio_si4713_s_modulator(struct file *file, void *p, 102 const struct v4l2_modulator *vm) 103 { 104 return v4l2_device_call_until_err(get_v4l2_dev(file), 0, tuner, 105 s_modulator, vm); 106 } 107 108 static int radio_si4713_g_frequency(struct file *file, void *p, 109 struct v4l2_frequency *vf) 110 { 111 return v4l2_device_call_until_err(get_v4l2_dev(file), 0, tuner, 112 g_frequency, vf); 113 } 114 115 static int radio_si4713_s_frequency(struct file *file, void *p, 116 const struct v4l2_frequency *vf) 117 { 118 return v4l2_device_call_until_err(get_v4l2_dev(file), 0, tuner, 119 s_frequency, vf); 120 } 121 122 static long radio_si4713_default(struct file *file, void *p, 123 bool valid_prio, unsigned int cmd, void *arg) 124 { 125 return v4l2_device_call_until_err(get_v4l2_dev(file), 0, core, 126 ioctl, cmd, arg); 127 } 128 129 static struct v4l2_ioctl_ops radio_si4713_ioctl_ops = { 130 .vidioc_querycap = radio_si4713_querycap, 131 .vidioc_g_modulator = radio_si4713_g_modulator, 132 .vidioc_s_modulator = radio_si4713_s_modulator, 133 .vidioc_g_frequency = radio_si4713_g_frequency, 134 .vidioc_s_frequency = radio_si4713_s_frequency, 135 .vidioc_log_status = v4l2_ctrl_log_status, 136 .vidioc_subscribe_event = v4l2_ctrl_subscribe_event, 137 .vidioc_unsubscribe_event = v4l2_event_unsubscribe, 138 .vidioc_default = radio_si4713_default, 139 }; 140 141 /* radio_si4713_vdev_template - video device interface */ 142 static struct video_device radio_si4713_vdev_template = { 143 .fops = &radio_si4713_fops, 144 .name = "radio-si4713", 145 .release = video_device_release_empty, 146 .ioctl_ops = &radio_si4713_ioctl_ops, 147 .vfl_dir = VFL_DIR_TX, 148 }; 149 150 /* Platform driver interface */ 151 /* radio_si4713_pdriver_probe - probe for the device */ 152 static int radio_si4713_pdriver_probe(struct platform_device *pdev) 153 { 154 struct radio_si4713_platform_data *pdata = pdev->dev.platform_data; 155 struct radio_si4713_device *rsdev; 156 struct v4l2_subdev *sd; 157 int rval = 0; 158 159 if (!pdata) { 160 dev_err(&pdev->dev, "Cannot proceed without platform data.\n"); 161 rval = -EINVAL; 162 goto exit; 163 } 164 165 rsdev = devm_kzalloc(&pdev->dev, sizeof(*rsdev), GFP_KERNEL); 166 if (!rsdev) { 167 dev_err(&pdev->dev, "Failed to alloc video device.\n"); 168 rval = -ENOMEM; 169 goto exit; 170 } 171 mutex_init(&rsdev->lock); 172 173 rval = v4l2_device_register(&pdev->dev, &rsdev->v4l2_dev); 174 if (rval) { 175 dev_err(&pdev->dev, "Failed to register v4l2 device.\n"); 176 goto exit; 177 } 178 179 sd = i2c_get_clientdata(pdata->subdev); 180 rval = v4l2_device_register_subdev(&rsdev->v4l2_dev, sd); 181 if (rval) { 182 dev_err(&pdev->dev, "Cannot get v4l2 subdevice\n"); 183 goto unregister_v4l2_dev; 184 } 185 186 rsdev->radio_dev = radio_si4713_vdev_template; 187 rsdev->radio_dev.v4l2_dev = &rsdev->v4l2_dev; 188 rsdev->radio_dev.ctrl_handler = sd->ctrl_handler; 189 /* Serialize all access to the si4713 */ 190 rsdev->radio_dev.lock = &rsdev->lock; 191 video_set_drvdata(&rsdev->radio_dev, rsdev); 192 if (video_register_device(&rsdev->radio_dev, VFL_TYPE_RADIO, radio_nr)) { 193 dev_err(&pdev->dev, "Could not register video device.\n"); 194 rval = -EIO; 195 goto unregister_v4l2_dev; 196 } 197 dev_info(&pdev->dev, "New device successfully probed\n"); 198 199 goto exit; 200 201 unregister_v4l2_dev: 202 v4l2_device_unregister(&rsdev->v4l2_dev); 203 exit: 204 return rval; 205 } 206 207 /* radio_si4713_pdriver_remove - remove the device */ 208 static int radio_si4713_pdriver_remove(struct platform_device *pdev) 209 { 210 struct v4l2_device *v4l2_dev = platform_get_drvdata(pdev); 211 struct radio_si4713_device *rsdev; 212 213 rsdev = container_of(v4l2_dev, struct radio_si4713_device, v4l2_dev); 214 video_unregister_device(&rsdev->radio_dev); 215 v4l2_device_unregister(&rsdev->v4l2_dev); 216 217 return 0; 218 } 219 220 static struct platform_driver radio_si4713_pdriver = { 221 .driver = { 222 .name = "radio-si4713", 223 }, 224 .probe = radio_si4713_pdriver_probe, 225 .remove = radio_si4713_pdriver_remove, 226 }; 227 228 module_platform_driver(radio_si4713_pdriver); 229