1 /* 2 * hdac_i915.c - routines for sync between HD-A core and i915 display driver 3 * 4 * This program is free software; you can redistribute it and/or modify it 5 * under the terms of the GNU General Public License as published by the Free 6 * Software Foundation; either version 2 of the License, or (at your option) 7 * any later version. 8 * 9 * This program is distributed in the hope that it will be useful, but 10 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 11 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * for more details. 13 */ 14 15 #include <linux/init.h> 16 #include <linux/module.h> 17 #include <linux/pci.h> 18 #include <linux/component.h> 19 #include <drm/i915_component.h> 20 #include <sound/core.h> 21 #include <sound/hdaudio.h> 22 #include <sound/hda_i915.h> 23 24 static struct i915_audio_component *hdac_acomp; 25 26 int snd_hdac_set_codec_wakeup(struct hdac_bus *bus, bool enable) 27 { 28 struct i915_audio_component *acomp = bus->audio_component; 29 30 if (!acomp || !acomp->ops) 31 return -ENODEV; 32 33 if (!acomp->ops->codec_wake_override) { 34 dev_warn(bus->dev, 35 "Invalid codec wake callback\n"); 36 return 0; 37 } 38 39 dev_dbg(bus->dev, "%s codec wakeup\n", 40 enable ? "enable" : "disable"); 41 42 acomp->ops->codec_wake_override(acomp->dev, enable); 43 44 return 0; 45 } 46 EXPORT_SYMBOL_GPL(snd_hdac_set_codec_wakeup); 47 48 int snd_hdac_display_power(struct hdac_bus *bus, bool enable) 49 { 50 struct i915_audio_component *acomp = bus->audio_component; 51 52 if (!acomp || !acomp->ops) 53 return -ENODEV; 54 55 dev_dbg(bus->dev, "display power %s\n", 56 enable ? "enable" : "disable"); 57 58 if (enable) { 59 if (!bus->i915_power_refcount++) 60 acomp->ops->get_power(acomp->dev); 61 } else { 62 WARN_ON(!bus->i915_power_refcount); 63 if (!--bus->i915_power_refcount) 64 acomp->ops->put_power(acomp->dev); 65 } 66 67 return 0; 68 } 69 EXPORT_SYMBOL_GPL(snd_hdac_display_power); 70 71 int snd_hdac_get_display_clk(struct hdac_bus *bus) 72 { 73 struct i915_audio_component *acomp = bus->audio_component; 74 75 if (!acomp || !acomp->ops) 76 return -ENODEV; 77 78 return acomp->ops->get_cdclk_freq(acomp->dev); 79 } 80 EXPORT_SYMBOL_GPL(snd_hdac_get_display_clk); 81 82 static int hdac_component_master_bind(struct device *dev) 83 { 84 struct i915_audio_component *acomp = hdac_acomp; 85 int ret; 86 87 ret = component_bind_all(dev, acomp); 88 if (ret < 0) 89 return ret; 90 91 if (WARN_ON(!(acomp->dev && acomp->ops && acomp->ops->get_power && 92 acomp->ops->put_power && acomp->ops->get_cdclk_freq))) { 93 ret = -EINVAL; 94 goto out_unbind; 95 } 96 97 /* 98 * Atm, we don't support dynamic unbinding initiated by the child 99 * component, so pin its containing module until we unbind. 100 */ 101 if (!try_module_get(acomp->ops->owner)) { 102 ret = -ENODEV; 103 goto out_unbind; 104 } 105 106 return 0; 107 108 out_unbind: 109 component_unbind_all(dev, acomp); 110 111 return ret; 112 } 113 114 static void hdac_component_master_unbind(struct device *dev) 115 { 116 struct i915_audio_component *acomp = hdac_acomp; 117 118 module_put(acomp->ops->owner); 119 component_unbind_all(dev, acomp); 120 WARN_ON(acomp->ops || acomp->dev); 121 } 122 123 static const struct component_master_ops hdac_component_master_ops = { 124 .bind = hdac_component_master_bind, 125 .unbind = hdac_component_master_unbind, 126 }; 127 128 static int hdac_component_master_match(struct device *dev, void *data) 129 { 130 /* i915 is the only supported component */ 131 return !strcmp(dev->driver->name, "i915"); 132 } 133 134 int snd_hdac_i915_init(struct hdac_bus *bus) 135 { 136 struct component_match *match = NULL; 137 struct device *dev = bus->dev; 138 struct i915_audio_component *acomp; 139 int ret; 140 141 acomp = kzalloc(sizeof(*acomp), GFP_KERNEL); 142 if (!acomp) 143 return -ENOMEM; 144 bus->audio_component = acomp; 145 hdac_acomp = acomp; 146 147 component_match_add(dev, &match, hdac_component_master_match, bus); 148 ret = component_master_add_with_match(dev, &hdac_component_master_ops, 149 match); 150 if (ret < 0) 151 goto out_err; 152 153 /* 154 * Atm, we don't support deferring the component binding, so make sure 155 * i915 is loaded and that the binding successfully completes. 156 */ 157 request_module("i915"); 158 159 if (!acomp->ops) { 160 ret = -ENODEV; 161 goto out_master_del; 162 } 163 dev_dbg(dev, "bound to i915 component master\n"); 164 165 return 0; 166 out_master_del: 167 component_master_del(dev, &hdac_component_master_ops); 168 out_err: 169 kfree(acomp); 170 bus->audio_component = NULL; 171 dev_err(dev, "failed to add i915 component master (%d)\n", ret); 172 173 return ret; 174 } 175 EXPORT_SYMBOL_GPL(snd_hdac_i915_init); 176 177 int snd_hdac_i915_exit(struct hdac_bus *bus) 178 { 179 struct device *dev = bus->dev; 180 struct i915_audio_component *acomp = bus->audio_component; 181 182 if (!acomp) 183 return 0; 184 185 WARN_ON(bus->i915_power_refcount); 186 if (bus->i915_power_refcount > 0 && acomp->ops) 187 acomp->ops->put_power(acomp->dev); 188 189 component_master_del(dev, &hdac_component_master_ops); 190 191 kfree(acomp); 192 bus->audio_component = NULL; 193 194 return 0; 195 } 196 EXPORT_SYMBOL_GPL(snd_hdac_i915_exit); 197