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Linux/drivers/gpu/drm/tilcdc/tilcdc_slave.c

  1 /*
  2  * Copyright (C) 2012 Texas Instruments
  3  * Author: Rob Clark <robdclark@gmail.com>
  4  *
  5  * This program is free software; you can redistribute it and/or modify it
  6  * under the terms of the GNU General Public License version 2 as published by
  7  * the Free Software Foundation.
  8  *
  9  * This program is distributed in the hope that it will be useful, but WITHOUT
 10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 12  * more details.
 13  *
 14  * You should have received a copy of the GNU General Public License along with
 15  * this program.  If not, see <http://www.gnu.org/licenses/>.
 16  */
 17 
 18 #include <linux/i2c.h>
 19 #include <linux/pinctrl/pinmux.h>
 20 #include <linux/pinctrl/consumer.h>
 21 #include <drm/drm_encoder_slave.h>
 22 
 23 #include "tilcdc_drv.h"
 24 
 25 struct slave_module {
 26         struct tilcdc_module base;
 27         struct i2c_adapter *i2c;
 28 };
 29 #define to_slave_module(x) container_of(x, struct slave_module, base)
 30 
 31 static const struct tilcdc_panel_info slave_info = {
 32                 .bpp                    = 16,
 33                 .ac_bias                = 255,
 34                 .ac_bias_intrpt         = 0,
 35                 .dma_burst_sz           = 16,
 36                 .fdd                    = 0x80,
 37                 .tft_alt_mode           = 0,
 38                 .sync_edge              = 0,
 39                 .sync_ctrl              = 1,
 40                 .raster_order           = 0,
 41 };
 42 
 43 
 44 /*
 45  * Encoder:
 46  */
 47 
 48 struct slave_encoder {
 49         struct drm_encoder_slave base;
 50         struct slave_module *mod;
 51 };
 52 #define to_slave_encoder(x) container_of(to_encoder_slave(x), struct slave_encoder, base)
 53 
 54 static inline struct drm_encoder_slave_funcs *
 55 get_slave_funcs(struct drm_encoder *enc)
 56 {
 57         return to_encoder_slave(enc)->slave_funcs;
 58 }
 59 
 60 static void slave_encoder_destroy(struct drm_encoder *encoder)
 61 {
 62         struct slave_encoder *slave_encoder = to_slave_encoder(encoder);
 63         if (get_slave_funcs(encoder))
 64                 get_slave_funcs(encoder)->destroy(encoder);
 65         drm_encoder_cleanup(encoder);
 66         kfree(slave_encoder);
 67 }
 68 
 69 static void slave_encoder_prepare(struct drm_encoder *encoder)
 70 {
 71         drm_i2c_encoder_prepare(encoder);
 72         tilcdc_crtc_set_panel_info(encoder->crtc, &slave_info);
 73 }
 74 
 75 static bool slave_encoder_fixup(struct drm_encoder *encoder,
 76                 const struct drm_display_mode *mode,
 77                 struct drm_display_mode *adjusted_mode)
 78 {
 79         /*
 80          * tilcdc does not generate VESA-complient sync but aligns
 81          * VS on the second edge of HS instead of first edge.
 82          * We use adjusted_mode, to fixup sync by aligning both rising
 83          * edges and add HSKEW offset to let the slave encoder fix it up.
 84          */
 85         adjusted_mode->hskew = mode->hsync_end - mode->hsync_start;
 86         adjusted_mode->flags |= DRM_MODE_FLAG_HSKEW;
 87 
 88         if (mode->flags & DRM_MODE_FLAG_NHSYNC) {
 89                 adjusted_mode->flags |= DRM_MODE_FLAG_PHSYNC;
 90                 adjusted_mode->flags &= ~DRM_MODE_FLAG_NHSYNC;
 91         } else {
 92                 adjusted_mode->flags |= DRM_MODE_FLAG_NHSYNC;
 93                 adjusted_mode->flags &= ~DRM_MODE_FLAG_PHSYNC;
 94         }
 95 
 96         return drm_i2c_encoder_mode_fixup(encoder, mode, adjusted_mode);
 97 }
 98 
 99 
100 static const struct drm_encoder_funcs slave_encoder_funcs = {
101                 .destroy        = slave_encoder_destroy,
102 };
103 
104 static const struct drm_encoder_helper_funcs slave_encoder_helper_funcs = {
105                 .dpms           = drm_i2c_encoder_dpms,
106                 .mode_fixup     = slave_encoder_fixup,
107                 .prepare        = slave_encoder_prepare,
108                 .commit         = drm_i2c_encoder_commit,
109                 .mode_set       = drm_i2c_encoder_mode_set,
110                 .save           = drm_i2c_encoder_save,
111                 .restore        = drm_i2c_encoder_restore,
112 };
113 
114 static const struct i2c_board_info info = {
115                 I2C_BOARD_INFO("tda998x", 0x70)
116 };
117 
118 static struct drm_encoder *slave_encoder_create(struct drm_device *dev,
119                 struct slave_module *mod)
120 {
121         struct slave_encoder *slave_encoder;
122         struct drm_encoder *encoder;
123         int ret;
124 
125         slave_encoder = kzalloc(sizeof(*slave_encoder), GFP_KERNEL);
126         if (!slave_encoder) {
127                 dev_err(dev->dev, "allocation failed\n");
128                 return NULL;
129         }
130 
131         slave_encoder->mod = mod;
132 
133         encoder = &slave_encoder->base.base;
134         encoder->possible_crtcs = 1;
135 
136         ret = drm_encoder_init(dev, encoder, &slave_encoder_funcs,
137                         DRM_MODE_ENCODER_TMDS);
138         if (ret)
139                 goto fail;
140 
141         drm_encoder_helper_add(encoder, &slave_encoder_helper_funcs);
142 
143         ret = drm_i2c_encoder_init(dev, to_encoder_slave(encoder), mod->i2c, &info);
144         if (ret)
145                 goto fail;
146 
147         return encoder;
148 
149 fail:
150         slave_encoder_destroy(encoder);
151         return NULL;
152 }
153 
154 /*
155  * Connector:
156  */
157 
158 struct slave_connector {
159         struct drm_connector base;
160 
161         struct drm_encoder *encoder;  /* our connected encoder */
162         struct slave_module *mod;
163 };
164 #define to_slave_connector(x) container_of(x, struct slave_connector, base)
165 
166 static void slave_connector_destroy(struct drm_connector *connector)
167 {
168         struct slave_connector *slave_connector = to_slave_connector(connector);
169         drm_connector_cleanup(connector);
170         kfree(slave_connector);
171 }
172 
173 static enum drm_connector_status slave_connector_detect(
174                 struct drm_connector *connector,
175                 bool force)
176 {
177         struct drm_encoder *encoder = to_slave_connector(connector)->encoder;
178         return get_slave_funcs(encoder)->detect(encoder, connector);
179 }
180 
181 static int slave_connector_get_modes(struct drm_connector *connector)
182 {
183         struct drm_encoder *encoder = to_slave_connector(connector)->encoder;
184         return get_slave_funcs(encoder)->get_modes(encoder, connector);
185 }
186 
187 static int slave_connector_mode_valid(struct drm_connector *connector,
188                   struct drm_display_mode *mode)
189 {
190         struct drm_encoder *encoder = to_slave_connector(connector)->encoder;
191         struct tilcdc_drm_private *priv = connector->dev->dev_private;
192         int ret;
193 
194         ret = tilcdc_crtc_mode_valid(priv->crtc, mode);
195         if (ret != MODE_OK)
196                 return ret;
197 
198         return get_slave_funcs(encoder)->mode_valid(encoder, mode);
199 }
200 
201 static struct drm_encoder *slave_connector_best_encoder(
202                 struct drm_connector *connector)
203 {
204         struct slave_connector *slave_connector = to_slave_connector(connector);
205         return slave_connector->encoder;
206 }
207 
208 static int slave_connector_set_property(struct drm_connector *connector,
209                 struct drm_property *property, uint64_t value)
210 {
211         struct drm_encoder *encoder = to_slave_connector(connector)->encoder;
212         return get_slave_funcs(encoder)->set_property(encoder,
213                         connector, property, value);
214 }
215 
216 static const struct drm_connector_funcs slave_connector_funcs = {
217         .destroy            = slave_connector_destroy,
218         .dpms               = drm_helper_connector_dpms,
219         .detect             = slave_connector_detect,
220         .fill_modes         = drm_helper_probe_single_connector_modes,
221         .set_property       = slave_connector_set_property,
222 };
223 
224 static const struct drm_connector_helper_funcs slave_connector_helper_funcs = {
225         .get_modes          = slave_connector_get_modes,
226         .mode_valid         = slave_connector_mode_valid,
227         .best_encoder       = slave_connector_best_encoder,
228 };
229 
230 static struct drm_connector *slave_connector_create(struct drm_device *dev,
231                 struct slave_module *mod, struct drm_encoder *encoder)
232 {
233         struct slave_connector *slave_connector;
234         struct drm_connector *connector;
235         int ret;
236 
237         slave_connector = kzalloc(sizeof(*slave_connector), GFP_KERNEL);
238         if (!slave_connector) {
239                 dev_err(dev->dev, "allocation failed\n");
240                 return NULL;
241         }
242 
243         slave_connector->encoder = encoder;
244         slave_connector->mod = mod;
245 
246         connector = &slave_connector->base;
247 
248         drm_connector_init(dev, connector, &slave_connector_funcs,
249                         DRM_MODE_CONNECTOR_HDMIA);
250         drm_connector_helper_add(connector, &slave_connector_helper_funcs);
251 
252         connector->polled = DRM_CONNECTOR_POLL_CONNECT |
253                         DRM_CONNECTOR_POLL_DISCONNECT;
254 
255         connector->interlace_allowed = 0;
256         connector->doublescan_allowed = 0;
257 
258         get_slave_funcs(encoder)->create_resources(encoder, connector);
259 
260         ret = drm_mode_connector_attach_encoder(connector, encoder);
261         if (ret)
262                 goto fail;
263 
264         drm_sysfs_connector_add(connector);
265 
266         return connector;
267 
268 fail:
269         slave_connector_destroy(connector);
270         return NULL;
271 }
272 
273 /*
274  * Module:
275  */
276 
277 static int slave_modeset_init(struct tilcdc_module *mod, struct drm_device *dev)
278 {
279         struct slave_module *slave_mod = to_slave_module(mod);
280         struct tilcdc_drm_private *priv = dev->dev_private;
281         struct drm_encoder *encoder;
282         struct drm_connector *connector;
283 
284         encoder = slave_encoder_create(dev, slave_mod);
285         if (!encoder)
286                 return -ENOMEM;
287 
288         connector = slave_connector_create(dev, slave_mod, encoder);
289         if (!connector)
290                 return -ENOMEM;
291 
292         priv->encoders[priv->num_encoders++] = encoder;
293         priv->connectors[priv->num_connectors++] = connector;
294 
295         return 0;
296 }
297 
298 static void slave_destroy(struct tilcdc_module *mod)
299 {
300         struct slave_module *slave_mod = to_slave_module(mod);
301 
302         tilcdc_module_cleanup(mod);
303         kfree(slave_mod);
304 }
305 
306 static const struct tilcdc_module_ops slave_module_ops = {
307                 .modeset_init = slave_modeset_init,
308                 .destroy = slave_destroy,
309 };
310 
311 /*
312  * Device:
313  */
314 
315 static struct of_device_id slave_of_match[];
316 
317 static int slave_probe(struct platform_device *pdev)
318 {
319         struct device_node *node = pdev->dev.of_node;
320         struct device_node *i2c_node;
321         struct slave_module *slave_mod;
322         struct tilcdc_module *mod;
323         struct pinctrl *pinctrl;
324         uint32_t i2c_phandle;
325         struct i2c_adapter *slavei2c;
326         int ret = -EINVAL;
327 
328         /* bail out early if no DT data: */
329         if (!node) {
330                 dev_err(&pdev->dev, "device-tree data is missing\n");
331                 return -ENXIO;
332         }
333 
334         /* Bail out early if i2c not specified */
335         if (of_property_read_u32(node, "i2c", &i2c_phandle)) {
336                 dev_err(&pdev->dev, "could not get i2c bus phandle\n");
337                 return ret;
338         }
339 
340         i2c_node = of_find_node_by_phandle(i2c_phandle);
341         if (!i2c_node) {
342                 dev_err(&pdev->dev, "could not get i2c bus node\n");
343                 return ret;
344         }
345 
346         /* but defer the probe if it can't be initialized it might come later */
347         slavei2c = of_find_i2c_adapter_by_node(i2c_node);
348         of_node_put(i2c_node);
349 
350         if (!slavei2c) {
351                 ret = -EPROBE_DEFER;
352                 tilcdc_slave_probedefer(true);
353                 dev_err(&pdev->dev, "could not get i2c\n");
354                 return ret;
355         }
356 
357         slave_mod = kzalloc(sizeof(*slave_mod), GFP_KERNEL);
358         if (!slave_mod)
359                 return -ENOMEM;
360 
361         mod = &slave_mod->base;
362 
363         mod->preferred_bpp = slave_info.bpp;
364 
365         slave_mod->i2c = slavei2c;
366 
367         tilcdc_module_init(mod, "slave", &slave_module_ops);
368 
369         pinctrl = devm_pinctrl_get_select_default(&pdev->dev);
370         if (IS_ERR(pinctrl))
371                 dev_warn(&pdev->dev, "pins are not configured\n");
372 
373         tilcdc_slave_probedefer(false);
374 
375         return 0;
376 }
377 
378 static int slave_remove(struct platform_device *pdev)
379 {
380         return 0;
381 }
382 
383 static struct of_device_id slave_of_match[] = {
384                 { .compatible = "ti,tilcdc,slave", },
385                 { },
386 };
387 
388 struct platform_driver slave_driver = {
389         .probe = slave_probe,
390         .remove = slave_remove,
391         .driver = {
392                 .owner = THIS_MODULE,
393                 .name = "slave",
394                 .of_match_table = slave_of_match,
395         },
396 };
397 
398 int __init tilcdc_slave_init(void)
399 {
400         return platform_driver_register(&slave_driver);
401 }
402 
403 void __exit tilcdc_slave_fini(void)
404 {
405         platform_driver_unregister(&slave_driver);
406 }
407 

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