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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_unregister(connector);
170         drm_connector_cleanup(connector);
171         kfree(slave_connector);
172 }
173 
174 static enum drm_connector_status slave_connector_detect(
175                 struct drm_connector *connector,
176                 bool force)
177 {
178         struct drm_encoder *encoder = to_slave_connector(connector)->encoder;
179         return get_slave_funcs(encoder)->detect(encoder, connector);
180 }
181 
182 static int slave_connector_get_modes(struct drm_connector *connector)
183 {
184         struct drm_encoder *encoder = to_slave_connector(connector)->encoder;
185         return get_slave_funcs(encoder)->get_modes(encoder, connector);
186 }
187 
188 static int slave_connector_mode_valid(struct drm_connector *connector,
189                   struct drm_display_mode *mode)
190 {
191         struct drm_encoder *encoder = to_slave_connector(connector)->encoder;
192         struct tilcdc_drm_private *priv = connector->dev->dev_private;
193         int ret;
194 
195         ret = tilcdc_crtc_mode_valid(priv->crtc, mode);
196         if (ret != MODE_OK)
197                 return ret;
198 
199         return get_slave_funcs(encoder)->mode_valid(encoder, mode);
200 }
201 
202 static struct drm_encoder *slave_connector_best_encoder(
203                 struct drm_connector *connector)
204 {
205         struct slave_connector *slave_connector = to_slave_connector(connector);
206         return slave_connector->encoder;
207 }
208 
209 static int slave_connector_set_property(struct drm_connector *connector,
210                 struct drm_property *property, uint64_t value)
211 {
212         struct drm_encoder *encoder = to_slave_connector(connector)->encoder;
213         return get_slave_funcs(encoder)->set_property(encoder,
214                         connector, property, value);
215 }
216 
217 static const struct drm_connector_funcs slave_connector_funcs = {
218         .destroy            = slave_connector_destroy,
219         .dpms               = drm_helper_connector_dpms,
220         .detect             = slave_connector_detect,
221         .fill_modes         = drm_helper_probe_single_connector_modes,
222         .set_property       = slave_connector_set_property,
223 };
224 
225 static const struct drm_connector_helper_funcs slave_connector_helper_funcs = {
226         .get_modes          = slave_connector_get_modes,
227         .mode_valid         = slave_connector_mode_valid,
228         .best_encoder       = slave_connector_best_encoder,
229 };
230 
231 static struct drm_connector *slave_connector_create(struct drm_device *dev,
232                 struct slave_module *mod, struct drm_encoder *encoder)
233 {
234         struct slave_connector *slave_connector;
235         struct drm_connector *connector;
236         int ret;
237 
238         slave_connector = kzalloc(sizeof(*slave_connector), GFP_KERNEL);
239         if (!slave_connector) {
240                 dev_err(dev->dev, "allocation failed\n");
241                 return NULL;
242         }
243 
244         slave_connector->encoder = encoder;
245         slave_connector->mod = mod;
246 
247         connector = &slave_connector->base;
248 
249         drm_connector_init(dev, connector, &slave_connector_funcs,
250                         DRM_MODE_CONNECTOR_HDMIA);
251         drm_connector_helper_add(connector, &slave_connector_helper_funcs);
252 
253         connector->polled = DRM_CONNECTOR_POLL_CONNECT |
254                         DRM_CONNECTOR_POLL_DISCONNECT;
255 
256         connector->interlace_allowed = 0;
257         connector->doublescan_allowed = 0;
258 
259         get_slave_funcs(encoder)->create_resources(encoder, connector);
260 
261         ret = drm_mode_connector_attach_encoder(connector, encoder);
262         if (ret)
263                 goto fail;
264 
265         drm_connector_register(connector);
266 
267         return connector;
268 
269 fail:
270         slave_connector_destroy(connector);
271         return NULL;
272 }
273 
274 /*
275  * Module:
276  */
277 
278 static int slave_modeset_init(struct tilcdc_module *mod, struct drm_device *dev)
279 {
280         struct slave_module *slave_mod = to_slave_module(mod);
281         struct tilcdc_drm_private *priv = dev->dev_private;
282         struct drm_encoder *encoder;
283         struct drm_connector *connector;
284 
285         encoder = slave_encoder_create(dev, slave_mod);
286         if (!encoder)
287                 return -ENOMEM;
288 
289         connector = slave_connector_create(dev, slave_mod, encoder);
290         if (!connector)
291                 return -ENOMEM;
292 
293         priv->encoders[priv->num_encoders++] = encoder;
294         priv->connectors[priv->num_connectors++] = connector;
295 
296         return 0;
297 }
298 
299 static const struct tilcdc_module_ops slave_module_ops = {
300                 .modeset_init = slave_modeset_init,
301 };
302 
303 /*
304  * Device:
305  */
306 
307 static struct of_device_id slave_of_match[];
308 
309 static int slave_probe(struct platform_device *pdev)
310 {
311         struct device_node *node = pdev->dev.of_node;
312         struct device_node *i2c_node;
313         struct slave_module *slave_mod;
314         struct tilcdc_module *mod;
315         struct pinctrl *pinctrl;
316         uint32_t i2c_phandle;
317         struct i2c_adapter *slavei2c;
318         int ret = -EINVAL;
319 
320         /* bail out early if no DT data: */
321         if (!node) {
322                 dev_err(&pdev->dev, "device-tree data is missing\n");
323                 return -ENXIO;
324         }
325 
326         /* Bail out early if i2c not specified */
327         if (of_property_read_u32(node, "i2c", &i2c_phandle)) {
328                 dev_err(&pdev->dev, "could not get i2c bus phandle\n");
329                 return ret;
330         }
331 
332         i2c_node = of_find_node_by_phandle(i2c_phandle);
333         if (!i2c_node) {
334                 dev_err(&pdev->dev, "could not get i2c bus node\n");
335                 return ret;
336         }
337 
338         /* but defer the probe if it can't be initialized it might come later */
339         slavei2c = of_find_i2c_adapter_by_node(i2c_node);
340         of_node_put(i2c_node);
341 
342         if (!slavei2c) {
343                 ret = -EPROBE_DEFER;
344                 tilcdc_slave_probedefer(true);
345                 dev_err(&pdev->dev, "could not get i2c\n");
346                 return ret;
347         }
348 
349         slave_mod = kzalloc(sizeof(*slave_mod), GFP_KERNEL);
350         if (!slave_mod) {
351                 ret = -ENOMEM;
352                 goto fail_adapter;
353         }
354 
355         mod = &slave_mod->base;
356         pdev->dev.platform_data = mod;
357 
358         mod->preferred_bpp = slave_info.bpp;
359 
360         slave_mod->i2c = slavei2c;
361 
362         tilcdc_module_init(mod, "slave", &slave_module_ops);
363 
364         pinctrl = devm_pinctrl_get_select_default(&pdev->dev);
365         if (IS_ERR(pinctrl))
366                 dev_warn(&pdev->dev, "pins are not configured\n");
367 
368         tilcdc_slave_probedefer(false);
369 
370         return 0;
371 
372 fail_adapter:
373         i2c_put_adapter(slavei2c);
374         return ret;
375 }
376 
377 static int slave_remove(struct platform_device *pdev)
378 {
379         struct tilcdc_module *mod = dev_get_platdata(&pdev->dev);
380         struct slave_module *slave_mod = to_slave_module(mod);
381 
382         tilcdc_module_cleanup(mod);
383         kfree(slave_mod);
384 
385         return 0;
386 }
387 
388 static struct of_device_id slave_of_match[] = {
389                 { .compatible = "ti,tilcdc,slave", },
390                 { },
391 };
392 
393 struct platform_driver slave_driver = {
394         .probe = slave_probe,
395         .remove = slave_remove,
396         .driver = {
397                 .owner = THIS_MODULE,
398                 .name = "slave",
399                 .of_match_table = slave_of_match,
400         },
401 };
402 
403 int __init tilcdc_slave_init(void)
404 {
405         return platform_driver_register(&slave_driver);
406 }
407 
408 void __exit tilcdc_slave_fini(void)
409 {
410         platform_driver_unregister(&slave_driver);
411 }
412 

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