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 snd_hdac_set_codec_wakeup(bus, true); 62 snd_hdac_set_codec_wakeup(bus, false); 63 } 64 } else { 65 WARN_ON(!bus->i915_power_refcount); 66 if (!--bus->i915_power_refcount) 67 acomp->ops->put_power(acomp->dev); 68 } 69 70 return 0; 71 } 72 EXPORT_SYMBOL_GPL(snd_hdac_display_power); 73 74 int snd_hdac_get_display_clk(struct hdac_bus *bus) 75 { 76 struct i915_audio_component *acomp = bus->audio_component; 77 78 if (!acomp || !acomp->ops) 79 return -ENODEV; 80 81 return acomp->ops->get_cdclk_freq(acomp->dev); 82 } 83 EXPORT_SYMBOL_GPL(snd_hdac_get_display_clk); 84 85 static int hdac_component_master_bind(struct device *dev) 86 { 87 struct i915_audio_component *acomp = hdac_acomp; 88 int ret; 89 90 ret = component_bind_all(dev, acomp); 91 if (ret < 0) 92 return ret; 93 94 if (WARN_ON(!(acomp->dev && acomp->ops && acomp->ops->get_power && 95 acomp->ops->put_power && acomp->ops->get_cdclk_freq))) { 96 ret = -EINVAL; 97 goto out_unbind; 98 } 99 100 /* 101 * Atm, we don't support dynamic unbinding initiated by the child 102 * component, so pin its containing module until we unbind. 103 */ 104 if (!try_module_get(acomp->ops->owner)) { 105 ret = -ENODEV; 106 goto out_unbind; 107 } 108 109 return 0; 110 111 out_unbind: 112 component_unbind_all(dev, acomp); 113 114 return ret; 115 } 116 117 static void hdac_component_master_unbind(struct device *dev) 118 { 119 struct i915_audio_component *acomp = hdac_acomp; 120 121 module_put(acomp->ops->owner); 122 component_unbind_all(dev, acomp); 123 WARN_ON(acomp->ops || acomp->dev); 124 } 125 126 static const struct component_master_ops hdac_component_master_ops = { 127 .bind = hdac_component_master_bind, 128 .unbind = hdac_component_master_unbind, 129 }; 130 131 static int hdac_component_master_match(struct device *dev, void *data) 132 { 133 /* i915 is the only supported component */ 134 return !strcmp(dev->driver->name, "i915"); 135 } 136 137 int snd_hdac_i915_init(struct hdac_bus *bus) 138 { 139 struct component_match *match = NULL; 140 struct device *dev = bus->dev; 141 struct i915_audio_component *acomp; 142 int ret; 143 144 acomp = kzalloc(sizeof(*acomp), GFP_KERNEL); 145 if (!acomp) 146 return -ENOMEM; 147 bus->audio_component = acomp; 148 hdac_acomp = acomp; 149 150 component_match_add(dev, &match, hdac_component_master_match, bus); 151 ret = component_master_add_with_match(dev, &hdac_component_master_ops, 152 match); 153 if (ret < 0) 154 goto out_err; 155 156 /* 157 * Atm, we don't support deferring the component binding, so make sure 158 * i915 is loaded and that the binding successfully completes. 159 */ 160 request_module("i915"); 161 162 if (!acomp->ops) { 163 ret = -ENODEV; 164 goto out_master_del; 165 } 166 dev_dbg(dev, "bound to i915 component master\n"); 167 168 return 0; 169 out_master_del: 170 component_master_del(dev, &hdac_component_master_ops); 171 out_err: 172 kfree(acomp); 173 bus->audio_component = NULL; 174 dev_err(dev, "failed to add i915 component master (%d)\n", ret); 175 176 return ret; 177 } 178 EXPORT_SYMBOL_GPL(snd_hdac_i915_init); 179 180 int snd_hdac_i915_exit(struct hdac_bus *bus) 181 { 182 struct device *dev = bus->dev; 183 struct i915_audio_component *acomp = bus->audio_component; 184 185 if (!acomp) 186 return 0; 187 188 WARN_ON(bus->i915_power_refcount); 189 if (bus->i915_power_refcount > 0 && acomp->ops) 190 acomp->ops->put_power(acomp->dev); 191 192 component_master_del(dev, &hdac_component_master_ops); 193 194 kfree(acomp); 195 bus->audio_component = NULL; 196 197 return 0; 198 } 199 EXPORT_SYMBOL_GPL(snd_hdac_i915_exit); 200