1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * drivers/media/radio/radio-si4713.c 4 * 5 * Platform Driver for Silicon Labs Si4713 FM Radio Transmitter: 6 * 7 * Copyright (c) 2008 Instituto Nokia de Tecnologia - INdT 8 * Contact: Eduardo Valentin <eduardo.valentin@nokia.com> 9 */ 10 11 #include <linux/kernel.h> 12 #include <linux/module.h> 13 #include <linux/init.h> 14 #include <linux/platform_device.h> 15 #include <linux/i2c.h> 16 #include <linux/videodev2.h> 17 #include <linux/slab.h> 18 #include <media/v4l2-device.h> 19 #include <media/v4l2-common.h> 20 #include <media/v4l2-ioctl.h> 21 #include <media/v4l2-fh.h> 22 #include <media/v4l2-ctrls.h> 23 #include <media/v4l2-event.h> 24 #include "si4713.h" 25 26 /* module parameters */ 27 static int radio_nr = -1; /* radio device minor (-1 ==> auto assign) */ 28 module_param(radio_nr, int, 0); 29 MODULE_PARM_DESC(radio_nr, 30 "Minor number for radio device (-1 ==> auto assign)"); 31 32 MODULE_LICENSE("GPL v2"); 33 MODULE_AUTHOR("Eduardo Valentin <eduardo.valentin@nokia.com>"); 34 MODULE_DESCRIPTION("Platform driver for Si4713 FM Radio Transmitter"); 35 MODULE_VERSION("0.0.1"); 36 MODULE_ALIAS("platform:radio-si4713"); 37 38 /* Driver state struct */ 39 struct radio_si4713_device { 40 struct v4l2_device v4l2_dev; 41 struct video_device radio_dev; 42 struct mutex lock; 43 }; 44 45 /* radio_si4713_fops - file operations interface */ 46 static const struct v4l2_file_operations radio_si4713_fops = { 47 .owner = THIS_MODULE, 48 .open = v4l2_fh_open, 49 .release = v4l2_fh_release, 50 .poll = v4l2_ctrl_poll, 51 /* Note: locking is done at the subdev level in the i2c driver. */ 52 .unlocked_ioctl = video_ioctl2, 53 }; 54 55 /* Video4Linux Interface */ 56 57 /* radio_si4713_querycap - query device capabilities */ 58 static int radio_si4713_querycap(struct file *file, void *priv, 59 struct v4l2_capability *capability) 60 { 61 strscpy(capability->driver, "radio-si4713", sizeof(capability->driver)); 62 strscpy(capability->card, "Silicon Labs Si4713 Modulator", 63 sizeof(capability->card)); 64 strscpy(capability->bus_info, "platform:radio-si4713", 65 sizeof(capability->bus_info)); 66 return 0; 67 } 68 69 /* 70 * v4l2 ioctl call backs. 71 * we are just a wrapper for v4l2_sub_devs. 72 */ 73 static inline struct v4l2_device *get_v4l2_dev(struct file *file) 74 { 75 return &((struct radio_si4713_device *)video_drvdata(file))->v4l2_dev; 76 } 77 78 static int radio_si4713_g_modulator(struct file *file, void *p, 79 struct v4l2_modulator *vm) 80 { 81 return v4l2_device_call_until_err(get_v4l2_dev(file), 0, tuner, 82 g_modulator, vm); 83 } 84 85 static int radio_si4713_s_modulator(struct file *file, void *p, 86 const struct v4l2_modulator *vm) 87 { 88 return v4l2_device_call_until_err(get_v4l2_dev(file), 0, tuner, 89 s_modulator, vm); 90 } 91 92 static int radio_si4713_g_frequency(struct file *file, void *p, 93 struct v4l2_frequency *vf) 94 { 95 return v4l2_device_call_until_err(get_v4l2_dev(file), 0, tuner, 96 g_frequency, vf); 97 } 98 99 static int radio_si4713_s_frequency(struct file *file, void *p, 100 const struct v4l2_frequency *vf) 101 { 102 return v4l2_device_call_until_err(get_v4l2_dev(file), 0, tuner, 103 s_frequency, vf); 104 } 105 106 static long radio_si4713_default(struct file *file, void *p, 107 bool valid_prio, unsigned int cmd, void *arg) 108 { 109 return v4l2_device_call_until_err(get_v4l2_dev(file), 0, core, 110 ioctl, cmd, arg); 111 } 112 113 static const struct v4l2_ioctl_ops radio_si4713_ioctl_ops = { 114 .vidioc_querycap = radio_si4713_querycap, 115 .vidioc_g_modulator = radio_si4713_g_modulator, 116 .vidioc_s_modulator = radio_si4713_s_modulator, 117 .vidioc_g_frequency = radio_si4713_g_frequency, 118 .vidioc_s_frequency = radio_si4713_s_frequency, 119 .vidioc_log_status = v4l2_ctrl_log_status, 120 .vidioc_subscribe_event = v4l2_ctrl_subscribe_event, 121 .vidioc_unsubscribe_event = v4l2_event_unsubscribe, 122 .vidioc_default = radio_si4713_default, 123 }; 124 125 /* radio_si4713_vdev_template - video device interface */ 126 static const struct video_device radio_si4713_vdev_template = { 127 .fops = &radio_si4713_fops, 128 .name = "radio-si4713", 129 .release = video_device_release_empty, 130 .ioctl_ops = &radio_si4713_ioctl_ops, 131 .vfl_dir = VFL_DIR_TX, 132 }; 133 134 /* Platform driver interface */ 135 /* radio_si4713_pdriver_probe - probe for the device */ 136 static int radio_si4713_pdriver_probe(struct platform_device *pdev) 137 { 138 struct radio_si4713_platform_data *pdata = pdev->dev.platform_data; 139 struct radio_si4713_device *rsdev; 140 struct v4l2_subdev *sd; 141 int rval = 0; 142 143 if (!pdata) { 144 dev_err(&pdev->dev, "Cannot proceed without platform data.\n"); 145 rval = -EINVAL; 146 goto exit; 147 } 148 149 rsdev = devm_kzalloc(&pdev->dev, sizeof(*rsdev), GFP_KERNEL); 150 if (!rsdev) { 151 dev_err(&pdev->dev, "Failed to alloc video device.\n"); 152 rval = -ENOMEM; 153 goto exit; 154 } 155 mutex_init(&rsdev->lock); 156 157 rval = v4l2_device_register(&pdev->dev, &rsdev->v4l2_dev); 158 if (rval) { 159 dev_err(&pdev->dev, "Failed to register v4l2 device.\n"); 160 goto exit; 161 } 162 163 sd = i2c_get_clientdata(pdata->subdev); 164 rval = v4l2_device_register_subdev(&rsdev->v4l2_dev, sd); 165 if (rval) { 166 dev_err(&pdev->dev, "Cannot get v4l2 subdevice\n"); 167 goto unregister_v4l2_dev; 168 } 169 170 rsdev->radio_dev = radio_si4713_vdev_template; 171 rsdev->radio_dev.v4l2_dev = &rsdev->v4l2_dev; 172 rsdev->radio_dev.ctrl_handler = sd->ctrl_handler; 173 /* Serialize all access to the si4713 */ 174 rsdev->radio_dev.lock = &rsdev->lock; 175 rsdev->radio_dev.device_caps = V4L2_CAP_MODULATOR | V4L2_CAP_RDS_OUTPUT; 176 video_set_drvdata(&rsdev->radio_dev, rsdev); 177 if (video_register_device(&rsdev->radio_dev, VFL_TYPE_RADIO, radio_nr)) { 178 dev_err(&pdev->dev, "Could not register video device.\n"); 179 rval = -EIO; 180 goto unregister_v4l2_dev; 181 } 182 dev_info(&pdev->dev, "New device successfully probed\n"); 183 184 goto exit; 185 186 unregister_v4l2_dev: 187 v4l2_device_unregister(&rsdev->v4l2_dev); 188 exit: 189 return rval; 190 } 191 192 /* radio_si4713_pdriver_remove - remove the device */ 193 static int radio_si4713_pdriver_remove(struct platform_device *pdev) 194 { 195 struct v4l2_device *v4l2_dev = platform_get_drvdata(pdev); 196 struct radio_si4713_device *rsdev; 197 198 rsdev = container_of(v4l2_dev, struct radio_si4713_device, v4l2_dev); 199 video_unregister_device(&rsdev->radio_dev); 200 v4l2_device_unregister(&rsdev->v4l2_dev); 201 202 return 0; 203 } 204 205 static struct platform_driver radio_si4713_pdriver = { 206 .driver = { 207 .name = "radio-si4713", 208 }, 209 .probe = radio_si4713_pdriver_probe, 210 .remove = radio_si4713_pdriver_remove, 211 }; 212 213 module_platform_driver(radio_si4713_pdriver); 214