| 1 | /* $NetBSD: drm_encoder_slave.c,v 1.1 2015/03/05 17:42:48 riastradh Exp $ */ |
| 2 | |
| 3 | /*- |
| 4 | * Copyright (c) 2015 The NetBSD Foundation, Inc. |
| 5 | * All rights reserved. |
| 6 | * |
| 7 | * This code is derived from software contributed to The NetBSD Foundation |
| 8 | * by Taylor R. Campbell. |
| 9 | * |
| 10 | * Redistribution and use in source and binary forms, with or without |
| 11 | * modification, are permitted provided that the following conditions |
| 12 | * are met: |
| 13 | * 1. Redistributions of source code must retain the above copyright |
| 14 | * notice, this list of conditions and the following disclaimer. |
| 15 | * 2. Redistributions in binary form must reproduce the above copyright |
| 16 | * notice, this list of conditions and the following disclaimer in the |
| 17 | * documentation and/or other materials provided with the distribution. |
| 18 | * |
| 19 | * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS |
| 20 | * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED |
| 21 | * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| 22 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS |
| 23 | * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
| 24 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
| 25 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
| 26 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
| 27 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| 28 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
| 29 | * POSSIBILITY OF SUCH DAMAGE. |
| 30 | */ |
| 31 | |
| 32 | #include <sys/cdefs.h> |
| 33 | __KERNEL_RCSID(0, "$NetBSD: drm_encoder_slave.c,v 1.1 2015/03/05 17:42:48 riastradh Exp $" ); |
| 34 | |
| 35 | #include <sys/types.h> |
| 36 | #include <sys/atomic.h> |
| 37 | #include <sys/errno.h> |
| 38 | #include <sys/kmem.h> |
| 39 | #include <sys/mutex.h> |
| 40 | #include <sys/rbtree.h> |
| 41 | #include <sys/systm.h> |
| 42 | |
| 43 | #include <linux/i2c.h> |
| 44 | |
| 45 | #include <drm/drm_encoder_slave.h> |
| 46 | |
| 47 | static struct { |
| 48 | kmutex_t lock; |
| 49 | rb_tree_t tree; /* struct drm_i2c_encoder_driver */ |
| 50 | } drm_i2c_encoder_drivers; |
| 51 | |
| 52 | static int |
| 53 | compare_i2c_encoders(void *cookie __unused, const void *va, const void *vb) |
| 54 | { |
| 55 | const struct drm_i2c_encoder_driver *const da = va; |
| 56 | const struct drm_i2c_encoder_driver *const db = vb; |
| 57 | |
| 58 | return strncmp(da->i2c_driver.driver.name, db->i2c_driver.driver.name, |
| 59 | I2C_NAME_SIZE); |
| 60 | } |
| 61 | |
| 62 | static int |
| 63 | compare_i2c_encoder_key(void *cookie __unused, const void *n, const void *k) |
| 64 | { |
| 65 | const struct drm_i2c_encoder_driver *const driver = n; |
| 66 | const char *const name = k; |
| 67 | |
| 68 | return strncmp(driver->i2c_driver.driver.name, name, I2C_NAME_SIZE); |
| 69 | } |
| 70 | |
| 71 | static rb_tree_ops_t drm_i2c_encoder_rb_ops = { |
| 72 | .rbto_compare_nodes = &compare_i2c_encoders, |
| 73 | .rbto_compare_key = &compare_i2c_encoder_key, |
| 74 | .rbto_node_offset = offsetof(struct drm_i2c_encoder_driver, rb_node), |
| 75 | .rbto_context = NULL, |
| 76 | }; |
| 77 | |
| 78 | void |
| 79 | drm_i2c_encoders_init(void) |
| 80 | { |
| 81 | |
| 82 | mutex_init(&drm_i2c_encoder_drivers.lock, MUTEX_DEFAULT, IPL_NONE); |
| 83 | rb_tree_init(&drm_i2c_encoder_drivers.tree, &drm_i2c_encoder_rb_ops); |
| 84 | } |
| 85 | |
| 86 | void |
| 87 | drm_i2c_encoders_fini(void) |
| 88 | { |
| 89 | |
| 90 | KASSERT(RB_TREE_MIN(&drm_i2c_encoder_drivers.tree) == NULL); |
| 91 | #if 0 /* XXX no rb_tree_destroy */ |
| 92 | rb_tree_destroy(&drm_i2c_encoder_drivers.tree); |
| 93 | #endif |
| 94 | mutex_destroy(&drm_i2c_encoder_drivers.lock); |
| 95 | } |
| 96 | |
| 97 | int |
| 98 | drm_i2c_encoder_register(struct module *owner __unused, |
| 99 | struct drm_i2c_encoder_driver *driver) |
| 100 | { |
| 101 | struct drm_i2c_encoder_driver *collision; |
| 102 | int ret = 0; |
| 103 | |
| 104 | mutex_enter(&drm_i2c_encoder_drivers.lock); |
| 105 | collision = rb_tree_insert_node(&drm_i2c_encoder_drivers.tree, driver); |
| 106 | if (collision != driver) |
| 107 | ret = -EEXIST; |
| 108 | mutex_exit(&drm_i2c_encoder_drivers.lock); |
| 109 | |
| 110 | return ret; |
| 111 | } |
| 112 | |
| 113 | void |
| 114 | drm_i2c_encoder_unregister(struct drm_i2c_encoder_driver *driver) |
| 115 | { |
| 116 | |
| 117 | /* XXX How to guarantee? */ |
| 118 | KASSERT(driver->refcnt == 0); |
| 119 | |
| 120 | mutex_enter(&drm_i2c_encoder_drivers.lock); |
| 121 | rb_tree_remove_node(&drm_i2c_encoder_drivers.tree, driver); |
| 122 | mutex_exit(&drm_i2c_encoder_drivers.lock); |
| 123 | } |
| 124 | |
| 125 | struct drm_i2c_encoder_bus_priv { |
| 126 | struct i2c_client *i2c_client; |
| 127 | struct drm_i2c_encoder_driver *i2c_driver; |
| 128 | }; |
| 129 | |
| 130 | int |
| 131 | drm_i2c_encoder_init(struct drm_device *dev, struct drm_encoder_slave *slave, |
| 132 | struct i2c_adapter *adapter, const struct i2c_board_info *info) |
| 133 | { |
| 134 | struct drm_i2c_encoder_driver *driver; |
| 135 | struct drm_i2c_encoder_bus_priv *bus_priv; |
| 136 | struct i2c_client *client; |
| 137 | unsigned refcnt; |
| 138 | int ret; |
| 139 | |
| 140 | bus_priv = kmem_alloc(sizeof(*bus_priv), KM_SLEEP); |
| 141 | slave->bus_priv = bus_priv; |
| 142 | |
| 143 | mutex_enter(&drm_i2c_encoder_drivers.lock); |
| 144 | driver = rb_tree_find_node(&drm_i2c_encoder_drivers.tree, info->type); |
| 145 | mutex_exit(&drm_i2c_encoder_drivers.lock); |
| 146 | if (driver == NULL) { |
| 147 | ret = -ENODEV; |
| 148 | goto fail0; |
| 149 | } |
| 150 | do { |
| 151 | refcnt = driver->refcnt; |
| 152 | if (refcnt == UINT_MAX) { |
| 153 | ret = -ENFILE; |
| 154 | goto fail0; |
| 155 | } |
| 156 | } while (atomic_cas_uint(&driver->refcnt, refcnt, refcnt + 1) |
| 157 | != refcnt); |
| 158 | bus_priv->i2c_driver = driver; |
| 159 | |
| 160 | client = i2c_new_device(adapter, info); |
| 161 | KASSERT(client != NULL); |
| 162 | bus_priv->i2c_client = client; |
| 163 | |
| 164 | ret = (*driver->encoder_init)(client, dev, slave); |
| 165 | if (ret) |
| 166 | goto fail1; |
| 167 | |
| 168 | if (info->platform_data) |
| 169 | (*slave->slave_funcs->set_config)(&slave->base, |
| 170 | info->platform_data); |
| 171 | |
| 172 | /* Success! */ |
| 173 | return 0; |
| 174 | |
| 175 | fail1: bus_priv->i2c_client = NULL; |
| 176 | i2c_unregister_device(client); |
| 177 | bus_priv->i2c_driver = NULL; |
| 178 | atomic_dec_uint(&driver->refcnt); |
| 179 | fail0: KASSERT(ret < 0); |
| 180 | slave->bus_priv = NULL; |
| 181 | kmem_free(bus_priv, sizeof(*bus_priv)); |
| 182 | return ret; |
| 183 | } |
| 184 | |
| 185 | void |
| 186 | drm_i2c_encoder_destroy(struct drm_encoder *encoder) |
| 187 | { |
| 188 | struct drm_encoder_slave *const slave = to_encoder_slave(encoder); |
| 189 | struct drm_i2c_encoder_bus_priv *const bus_priv = slave->bus_priv; |
| 190 | struct i2c_client *const client = bus_priv->i2c_client; |
| 191 | struct drm_i2c_encoder_driver *const driver = bus_priv->i2c_driver; |
| 192 | |
| 193 | bus_priv->i2c_client = NULL; |
| 194 | i2c_unregister_device(client); |
| 195 | bus_priv->i2c_driver = NULL; |
| 196 | atomic_dec_uint(&driver->refcnt); |
| 197 | } |
| 198 | |
| 199 | struct i2c_client * |
| 200 | drm_i2c_encoder_get_client(struct drm_encoder *encoder) |
| 201 | { |
| 202 | struct drm_encoder_slave *const slave = to_encoder_slave(encoder); |
| 203 | struct drm_i2c_encoder_bus_priv *const bus_priv = slave->bus_priv; |
| 204 | |
| 205 | return bus_priv->i2c_client; |
| 206 | } |
| 207 | |
| 208 | static inline struct drm_encoder_slave_funcs * |
| 209 | slave_funcs(struct drm_encoder *encoder) |
| 210 | { |
| 211 | |
| 212 | return to_encoder_slave(encoder)->slave_funcs; |
| 213 | } |
| 214 | |
| 215 | void |
| 216 | drm_i2c_encoder_dpms(struct drm_encoder *encoder, int mode) |
| 217 | { |
| 218 | |
| 219 | (*slave_funcs(encoder)->dpms)(encoder, mode); |
| 220 | } |
| 221 | |
| 222 | void |
| 223 | drm_i2c_encoder_prepare(struct drm_encoder *encoder) |
| 224 | { |
| 225 | |
| 226 | drm_i2c_encoder_dpms(encoder, DRM_MODE_DPMS_OFF); |
| 227 | } |
| 228 | |
| 229 | void |
| 230 | drm_i2c_encoder_commit(struct drm_encoder *encoder) |
| 231 | { |
| 232 | |
| 233 | drm_i2c_encoder_dpms(encoder, DRM_MODE_DPMS_ON); |
| 234 | } |
| 235 | |
| 236 | bool |
| 237 | drm_i2c_encoder_mode_fixup(struct drm_encoder *encoder, |
| 238 | const struct drm_display_mode *mode, |
| 239 | struct drm_display_mode *adjusted_mode) |
| 240 | { |
| 241 | |
| 242 | return (*slave_funcs(encoder)->mode_fixup)(encoder, mode, |
| 243 | adjusted_mode); |
| 244 | } |
| 245 | |
| 246 | void |
| 247 | drm_i2c_encoder_mode_set(struct drm_encoder *encoder, |
| 248 | struct drm_display_mode *mode, struct drm_display_mode *adjusted_mode) |
| 249 | { |
| 250 | |
| 251 | return (*slave_funcs(encoder)->mode_set)(encoder, mode, adjusted_mode); |
| 252 | } |
| 253 | |
| 254 | enum drm_connector_status |
| 255 | drm_i2c_encoder_detect(struct drm_encoder *encoder, |
| 256 | struct drm_connector *connector) |
| 257 | { |
| 258 | |
| 259 | return (*slave_funcs(encoder)->detect)(encoder, connector); |
| 260 | } |
| 261 | |
| 262 | void |
| 263 | drm_i2c_encoder_save(struct drm_encoder *encoder) |
| 264 | { |
| 265 | |
| 266 | (*slave_funcs(encoder)->save)(encoder); |
| 267 | } |
| 268 | |
| 269 | void |
| 270 | drm_i2c_encoder_restore(struct drm_encoder *encoder) |
| 271 | { |
| 272 | |
| 273 | (*slave_funcs(encoder)->restore)(encoder); |
| 274 | } |
| 275 | |