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068a0023 AH |
1 | /* |
2 | * MIPI DSI Bus | |
3 | * | |
4 | * Copyright (C) 2012-2013, Samsung Electronics, Co., Ltd. | |
5 | * Andrzej Hajda <a.hajda@samsung.com> | |
6 | * | |
7 | * Permission is hereby granted, free of charge, to any person obtaining a | |
8 | * copy of this software and associated documentation files (the | |
9 | * "Software"), to deal in the Software without restriction, including | |
10 | * without limitation the rights to use, copy, modify, merge, publish, | |
11 | * distribute, sub license, and/or sell copies of the Software, and to | |
12 | * permit persons to whom the Software is furnished to do so, subject to | |
13 | * the following conditions: | |
14 | * | |
15 | * The above copyright notice and this permission notice (including the | |
16 | * next paragraph) shall be included in all copies or substantial portions | |
17 | * of the Software. | |
18 | * | |
19 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
20 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
21 | * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL | |
22 | * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, | |
23 | * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR | |
24 | * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE | |
25 | * USE OR OTHER DEALINGS IN THE SOFTWARE. | |
26 | */ | |
27 | ||
28 | #include <drm/drm_mipi_dsi.h> | |
29 | ||
30 | #include <linux/device.h> | |
31 | #include <linux/module.h> | |
32 | #include <linux/of_device.h> | |
33 | #include <linux/pm_runtime.h> | |
34 | #include <linux/slab.h> | |
35 | ||
36 | #include <video/mipi_display.h> | |
37 | ||
38 | static int mipi_dsi_device_match(struct device *dev, struct device_driver *drv) | |
39 | { | |
40 | return of_driver_match_device(dev, drv); | |
41 | } | |
42 | ||
43 | static const struct dev_pm_ops mipi_dsi_device_pm_ops = { | |
44 | .runtime_suspend = pm_generic_runtime_suspend, | |
45 | .runtime_resume = pm_generic_runtime_resume, | |
46 | .suspend = pm_generic_suspend, | |
47 | .resume = pm_generic_resume, | |
48 | .freeze = pm_generic_freeze, | |
49 | .thaw = pm_generic_thaw, | |
50 | .poweroff = pm_generic_poweroff, | |
51 | .restore = pm_generic_restore, | |
52 | }; | |
53 | ||
54 | static struct bus_type mipi_dsi_bus_type = { | |
55 | .name = "mipi-dsi", | |
56 | .match = mipi_dsi_device_match, | |
57 | .pm = &mipi_dsi_device_pm_ops, | |
58 | }; | |
59 | ||
60 | static void mipi_dsi_dev_release(struct device *dev) | |
61 | { | |
62 | struct mipi_dsi_device *dsi = to_mipi_dsi_device(dev); | |
63 | ||
64 | of_node_put(dev->of_node); | |
65 | kfree(dsi); | |
66 | } | |
67 | ||
68 | static const struct device_type mipi_dsi_device_type = { | |
69 | .release = mipi_dsi_dev_release, | |
70 | }; | |
71 | ||
72 | static struct mipi_dsi_device *mipi_dsi_device_alloc(struct mipi_dsi_host *host) | |
73 | { | |
74 | struct mipi_dsi_device *dsi; | |
75 | ||
76 | dsi = kzalloc(sizeof(*dsi), GFP_KERNEL); | |
77 | if (!dsi) | |
78 | return ERR_PTR(-ENOMEM); | |
79 | ||
80 | dsi->host = host; | |
81 | dsi->dev.bus = &mipi_dsi_bus_type; | |
82 | dsi->dev.parent = host->dev; | |
83 | dsi->dev.type = &mipi_dsi_device_type; | |
84 | ||
85 | device_initialize(&dsi->dev); | |
86 | ||
87 | return dsi; | |
88 | } | |
89 | ||
90 | static int mipi_dsi_device_add(struct mipi_dsi_device *dsi) | |
91 | { | |
92 | struct mipi_dsi_host *host = dsi->host; | |
93 | ||
94 | dev_set_name(&dsi->dev, "%s.%d", dev_name(host->dev), dsi->channel); | |
95 | ||
96 | return device_add(&dsi->dev); | |
97 | } | |
98 | ||
99 | static struct mipi_dsi_device * | |
100 | of_mipi_dsi_device_add(struct mipi_dsi_host *host, struct device_node *node) | |
101 | { | |
102 | struct mipi_dsi_device *dsi; | |
103 | struct device *dev = host->dev; | |
104 | int ret; | |
105 | u32 reg; | |
106 | ||
107 | ret = of_property_read_u32(node, "reg", ®); | |
108 | if (ret) { | |
109 | dev_err(dev, "device node %s has no valid reg property: %d\n", | |
110 | node->full_name, ret); | |
111 | return ERR_PTR(-EINVAL); | |
112 | } | |
113 | ||
114 | if (reg > 3) { | |
115 | dev_err(dev, "device node %s has invalid reg property: %u\n", | |
116 | node->full_name, reg); | |
117 | return ERR_PTR(-EINVAL); | |
118 | } | |
119 | ||
120 | dsi = mipi_dsi_device_alloc(host); | |
121 | if (IS_ERR(dsi)) { | |
122 | dev_err(dev, "failed to allocate DSI device %s: %ld\n", | |
123 | node->full_name, PTR_ERR(dsi)); | |
124 | return dsi; | |
125 | } | |
126 | ||
127 | dsi->dev.of_node = of_node_get(node); | |
128 | dsi->channel = reg; | |
129 | ||
130 | ret = mipi_dsi_device_add(dsi); | |
131 | if (ret) { | |
132 | dev_err(dev, "failed to add DSI device %s: %d\n", | |
133 | node->full_name, ret); | |
134 | kfree(dsi); | |
135 | return ERR_PTR(ret); | |
136 | } | |
137 | ||
138 | return dsi; | |
139 | } | |
140 | ||
141 | int mipi_dsi_host_register(struct mipi_dsi_host *host) | |
142 | { | |
143 | struct device_node *node; | |
144 | ||
145 | for_each_available_child_of_node(host->dev->of_node, node) | |
146 | of_mipi_dsi_device_add(host, node); | |
147 | ||
148 | return 0; | |
149 | } | |
150 | EXPORT_SYMBOL(mipi_dsi_host_register); | |
151 | ||
152 | static int mipi_dsi_remove_device_fn(struct device *dev, void *priv) | |
153 | { | |
154 | struct mipi_dsi_device *dsi = to_mipi_dsi_device(dev); | |
155 | ||
156 | device_unregister(&dsi->dev); | |
157 | ||
158 | return 0; | |
159 | } | |
160 | ||
161 | void mipi_dsi_host_unregister(struct mipi_dsi_host *host) | |
162 | { | |
163 | device_for_each_child(host->dev, NULL, mipi_dsi_remove_device_fn); | |
164 | } | |
165 | EXPORT_SYMBOL(mipi_dsi_host_unregister); | |
166 | ||
167 | /** | |
168 | * mipi_dsi_attach - attach a DSI device to its DSI host | |
169 | * @dsi: DSI peripheral | |
170 | */ | |
171 | int mipi_dsi_attach(struct mipi_dsi_device *dsi) | |
172 | { | |
173 | const struct mipi_dsi_host_ops *ops = dsi->host->ops; | |
174 | ||
175 | if (!ops || !ops->attach) | |
176 | return -ENOSYS; | |
177 | ||
178 | return ops->attach(dsi->host, dsi); | |
179 | } | |
180 | EXPORT_SYMBOL(mipi_dsi_attach); | |
181 | ||
182 | /** | |
183 | * mipi_dsi_detach - detach a DSI device from its DSI host | |
184 | * @dsi: DSI peripheral | |
185 | */ | |
186 | int mipi_dsi_detach(struct mipi_dsi_device *dsi) | |
187 | { | |
188 | const struct mipi_dsi_host_ops *ops = dsi->host->ops; | |
189 | ||
190 | if (!ops || !ops->detach) | |
191 | return -ENOSYS; | |
192 | ||
193 | return ops->detach(dsi->host, dsi); | |
194 | } | |
195 | EXPORT_SYMBOL(mipi_dsi_detach); | |
196 | ||
197 | /** | |
198 | * mipi_dsi_dcs_write - send DCS write command | |
199 | * @dsi: DSI device | |
200 | * @channel: virtual channel | |
201 | * @data: pointer to the command followed by parameters | |
202 | * @len: length of @data | |
203 | */ | |
204 | int mipi_dsi_dcs_write(struct mipi_dsi_device *dsi, unsigned int channel, | |
205 | const void *data, size_t len) | |
206 | { | |
207 | const struct mipi_dsi_host_ops *ops = dsi->host->ops; | |
208 | struct mipi_dsi_msg msg = { | |
209 | .channel = channel, | |
210 | .tx_buf = data, | |
211 | .tx_len = len | |
212 | }; | |
213 | ||
214 | if (!ops || !ops->transfer) | |
215 | return -ENOSYS; | |
216 | ||
217 | switch (len) { | |
218 | case 0: | |
219 | return -EINVAL; | |
220 | case 1: | |
221 | msg.type = MIPI_DSI_DCS_SHORT_WRITE; | |
222 | break; | |
223 | case 2: | |
224 | msg.type = MIPI_DSI_DCS_SHORT_WRITE_PARAM; | |
225 | break; | |
226 | default: | |
227 | msg.type = MIPI_DSI_DCS_LONG_WRITE; | |
228 | break; | |
229 | } | |
230 | ||
231 | return ops->transfer(dsi->host, &msg); | |
232 | } | |
233 | EXPORT_SYMBOL(mipi_dsi_dcs_write); | |
234 | ||
235 | /** | |
236 | * mipi_dsi_dcs_read - send DCS read request command | |
237 | * @dsi: DSI device | |
238 | * @channel: virtual channel | |
239 | * @cmd: DCS read command | |
240 | * @data: pointer to read buffer | |
241 | * @len: length of @data | |
242 | * | |
243 | * Function returns number of read bytes or error code. | |
244 | */ | |
245 | ssize_t mipi_dsi_dcs_read(struct mipi_dsi_device *dsi, unsigned int channel, | |
246 | u8 cmd, void *data, size_t len) | |
247 | { | |
248 | const struct mipi_dsi_host_ops *ops = dsi->host->ops; | |
249 | struct mipi_dsi_msg msg = { | |
250 | .channel = channel, | |
251 | .type = MIPI_DSI_DCS_READ, | |
252 | .tx_buf = &cmd, | |
253 | .tx_len = 1, | |
254 | .rx_buf = data, | |
255 | .rx_len = len | |
256 | }; | |
257 | ||
258 | if (!ops || !ops->transfer) | |
259 | return -ENOSYS; | |
260 | ||
261 | return ops->transfer(dsi->host, &msg); | |
262 | } | |
263 | EXPORT_SYMBOL(mipi_dsi_dcs_read); | |
264 | ||
265 | static int mipi_dsi_drv_probe(struct device *dev) | |
266 | { | |
267 | struct mipi_dsi_driver *drv = to_mipi_dsi_driver(dev->driver); | |
268 | struct mipi_dsi_device *dsi = to_mipi_dsi_device(dev); | |
269 | ||
270 | return drv->probe(dsi); | |
271 | } | |
272 | ||
273 | static int mipi_dsi_drv_remove(struct device *dev) | |
274 | { | |
275 | struct mipi_dsi_driver *drv = to_mipi_dsi_driver(dev->driver); | |
276 | struct mipi_dsi_device *dsi = to_mipi_dsi_device(dev); | |
277 | ||
278 | return drv->remove(dsi); | |
279 | } | |
280 | ||
281 | /** | |
282 | * mipi_dsi_driver_register - register a driver for DSI devices | |
283 | * @drv: DSI driver structure | |
284 | */ | |
285 | int mipi_dsi_driver_register(struct mipi_dsi_driver *drv) | |
286 | { | |
287 | drv->driver.bus = &mipi_dsi_bus_type; | |
288 | if (drv->probe) | |
289 | drv->driver.probe = mipi_dsi_drv_probe; | |
290 | if (drv->remove) | |
291 | drv->driver.remove = mipi_dsi_drv_remove; | |
292 | ||
293 | return driver_register(&drv->driver); | |
294 | } | |
295 | EXPORT_SYMBOL(mipi_dsi_driver_register); | |
296 | ||
297 | /** | |
298 | * mipi_dsi_driver_unregister - unregister a driver for DSI devices | |
299 | * @drv: DSI driver structure | |
300 | */ | |
301 | void mipi_dsi_driver_unregister(struct mipi_dsi_driver *drv) | |
302 | { | |
303 | driver_unregister(&drv->driver); | |
304 | } | |
305 | EXPORT_SYMBOL(mipi_dsi_driver_unregister); | |
306 | ||
307 | static int __init mipi_dsi_bus_init(void) | |
308 | { | |
309 | return bus_register(&mipi_dsi_bus_type); | |
310 | } | |
311 | postcore_initcall(mipi_dsi_bus_init); | |
312 | ||
313 | MODULE_AUTHOR("Andrzej Hajda <a.hajda@samsung.com>"); | |
314 | MODULE_DESCRIPTION("MIPI DSI Bus"); | |
315 | MODULE_LICENSE("GPL and additional rights"); |