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