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Linux/drivers/gpu/drm/tilcdc/tilcdc_tfp410.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/gpio.h>
 20 #include <linux/of_gpio.h>
 21 #include <linux/pinctrl/pinmux.h>
 22 #include <linux/pinctrl/consumer.h>
 23 
 24 #include "tilcdc_drv.h"
 25 
 26 struct tfp410_module {
 27         struct tilcdc_module base;
 28         struct i2c_adapter *i2c;
 29         int gpio;
 30 };
 31 #define to_tfp410_module(x) container_of(x, struct tfp410_module, base)
 32 
 33 
 34 static const struct tilcdc_panel_info dvi_info = {
 35                 .ac_bias                = 255,
 36                 .ac_bias_intrpt         = 0,
 37                 .dma_burst_sz           = 16,
 38                 .bpp                    = 16,
 39                 .fdd                    = 0x80,
 40                 .tft_alt_mode           = 0,
 41                 .sync_edge              = 0,
 42                 .sync_ctrl              = 1,
 43                 .raster_order           = 0,
 44 };
 45 
 46 /*
 47  * Encoder:
 48  */
 49 
 50 struct tfp410_encoder {
 51         struct drm_encoder base;
 52         struct tfp410_module *mod;
 53         int dpms;
 54 };
 55 #define to_tfp410_encoder(x) container_of(x, struct tfp410_encoder, base)
 56 
 57 
 58 static void tfp410_encoder_destroy(struct drm_encoder *encoder)
 59 {
 60         struct tfp410_encoder *tfp410_encoder = to_tfp410_encoder(encoder);
 61         drm_encoder_cleanup(encoder);
 62         kfree(tfp410_encoder);
 63 }
 64 
 65 static void tfp410_encoder_dpms(struct drm_encoder *encoder, int mode)
 66 {
 67         struct tfp410_encoder *tfp410_encoder = to_tfp410_encoder(encoder);
 68 
 69         if (tfp410_encoder->dpms == mode)
 70                 return;
 71 
 72         if (mode == DRM_MODE_DPMS_ON) {
 73                 DBG("Power on");
 74                 gpio_direction_output(tfp410_encoder->mod->gpio, 1);
 75         } else {
 76                 DBG("Power off");
 77                 gpio_direction_output(tfp410_encoder->mod->gpio, 0);
 78         }
 79 
 80         tfp410_encoder->dpms = mode;
 81 }
 82 
 83 static bool tfp410_encoder_mode_fixup(struct drm_encoder *encoder,
 84                 const struct drm_display_mode *mode,
 85                 struct drm_display_mode *adjusted_mode)
 86 {
 87         /* nothing needed */
 88         return true;
 89 }
 90 
 91 static void tfp410_encoder_prepare(struct drm_encoder *encoder)
 92 {
 93         tfp410_encoder_dpms(encoder, DRM_MODE_DPMS_OFF);
 94         tilcdc_crtc_set_panel_info(encoder->crtc, &dvi_info);
 95 }
 96 
 97 static void tfp410_encoder_commit(struct drm_encoder *encoder)
 98 {
 99         tfp410_encoder_dpms(encoder, DRM_MODE_DPMS_ON);
100 }
101 
102 static void tfp410_encoder_mode_set(struct drm_encoder *encoder,
103                 struct drm_display_mode *mode,
104                 struct drm_display_mode *adjusted_mode)
105 {
106         /* nothing needed */
107 }
108 
109 static const struct drm_encoder_funcs tfp410_encoder_funcs = {
110                 .destroy        = tfp410_encoder_destroy,
111 };
112 
113 static const struct drm_encoder_helper_funcs tfp410_encoder_helper_funcs = {
114                 .dpms           = tfp410_encoder_dpms,
115                 .mode_fixup     = tfp410_encoder_mode_fixup,
116                 .prepare        = tfp410_encoder_prepare,
117                 .commit         = tfp410_encoder_commit,
118                 .mode_set       = tfp410_encoder_mode_set,
119 };
120 
121 static struct drm_encoder *tfp410_encoder_create(struct drm_device *dev,
122                 struct tfp410_module *mod)
123 {
124         struct tfp410_encoder *tfp410_encoder;
125         struct drm_encoder *encoder;
126         int ret;
127 
128         tfp410_encoder = kzalloc(sizeof(*tfp410_encoder), GFP_KERNEL);
129         if (!tfp410_encoder) {
130                 dev_err(dev->dev, "allocation failed\n");
131                 return NULL;
132         }
133 
134         tfp410_encoder->dpms = DRM_MODE_DPMS_OFF;
135         tfp410_encoder->mod = mod;
136 
137         encoder = &tfp410_encoder->base;
138         encoder->possible_crtcs = 1;
139 
140         ret = drm_encoder_init(dev, encoder, &tfp410_encoder_funcs,
141                         DRM_MODE_ENCODER_TMDS);
142         if (ret < 0)
143                 goto fail;
144 
145         drm_encoder_helper_add(encoder, &tfp410_encoder_helper_funcs);
146 
147         return encoder;
148 
149 fail:
150         tfp410_encoder_destroy(encoder);
151         return NULL;
152 }
153 
154 /*
155  * Connector:
156  */
157 
158 struct tfp410_connector {
159         struct drm_connector base;
160 
161         struct drm_encoder *encoder;  /* our connected encoder */
162         struct tfp410_module *mod;
163 };
164 #define to_tfp410_connector(x) container_of(x, struct tfp410_connector, base)
165 
166 
167 static void tfp410_connector_destroy(struct drm_connector *connector)
168 {
169         struct tfp410_connector *tfp410_connector = to_tfp410_connector(connector);
170         drm_connector_cleanup(connector);
171         kfree(tfp410_connector);
172 }
173 
174 static enum drm_connector_status tfp410_connector_detect(
175                 struct drm_connector *connector,
176                 bool force)
177 {
178         struct tfp410_connector *tfp410_connector = to_tfp410_connector(connector);
179 
180         if (drm_probe_ddc(tfp410_connector->mod->i2c))
181                 return connector_status_connected;
182 
183         return connector_status_unknown;
184 }
185 
186 static int tfp410_connector_get_modes(struct drm_connector *connector)
187 {
188         struct tfp410_connector *tfp410_connector = to_tfp410_connector(connector);
189         struct edid *edid;
190         int ret = 0;
191 
192         edid = drm_get_edid(connector, tfp410_connector->mod->i2c);
193 
194         drm_mode_connector_update_edid_property(connector, edid);
195 
196         if (edid) {
197                 ret = drm_add_edid_modes(connector, edid);
198                 kfree(edid);
199         }
200 
201         return ret;
202 }
203 
204 static int tfp410_connector_mode_valid(struct drm_connector *connector,
205                   struct drm_display_mode *mode)
206 {
207         struct tilcdc_drm_private *priv = connector->dev->dev_private;
208         /* our only constraints are what the crtc can generate: */
209         return tilcdc_crtc_mode_valid(priv->crtc, mode);
210 }
211 
212 static struct drm_encoder *tfp410_connector_best_encoder(
213                 struct drm_connector *connector)
214 {
215         struct tfp410_connector *tfp410_connector = to_tfp410_connector(connector);
216         return tfp410_connector->encoder;
217 }
218 
219 static const struct drm_connector_funcs tfp410_connector_funcs = {
220         .destroy            = tfp410_connector_destroy,
221         .dpms               = drm_helper_connector_dpms,
222         .detect             = tfp410_connector_detect,
223         .fill_modes         = drm_helper_probe_single_connector_modes,
224 };
225 
226 static const struct drm_connector_helper_funcs tfp410_connector_helper_funcs = {
227         .get_modes          = tfp410_connector_get_modes,
228         .mode_valid         = tfp410_connector_mode_valid,
229         .best_encoder       = tfp410_connector_best_encoder,
230 };
231 
232 static struct drm_connector *tfp410_connector_create(struct drm_device *dev,
233                 struct tfp410_module *mod, struct drm_encoder *encoder)
234 {
235         struct tfp410_connector *tfp410_connector;
236         struct drm_connector *connector;
237         int ret;
238 
239         tfp410_connector = kzalloc(sizeof(*tfp410_connector), GFP_KERNEL);
240         if (!tfp410_connector) {
241                 dev_err(dev->dev, "allocation failed\n");
242                 return NULL;
243         }
244 
245         tfp410_connector->encoder = encoder;
246         tfp410_connector->mod = mod;
247 
248         connector = &tfp410_connector->base;
249 
250         drm_connector_init(dev, connector, &tfp410_connector_funcs,
251                         DRM_MODE_CONNECTOR_DVID);
252         drm_connector_helper_add(connector, &tfp410_connector_helper_funcs);
253 
254         connector->polled = DRM_CONNECTOR_POLL_CONNECT |
255                         DRM_CONNECTOR_POLL_DISCONNECT;
256 
257         connector->interlace_allowed = 0;
258         connector->doublescan_allowed = 0;
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         tfp410_connector_destroy(connector);
270         return NULL;
271 }
272 
273 /*
274  * Module:
275  */
276 
277 static int tfp410_modeset_init(struct tilcdc_module *mod, struct drm_device *dev)
278 {
279         struct tfp410_module *tfp410_mod = to_tfp410_module(mod);
280         struct tilcdc_drm_private *priv = dev->dev_private;
281         struct drm_encoder *encoder;
282         struct drm_connector *connector;
283 
284         encoder = tfp410_encoder_create(dev, tfp410_mod);
285         if (!encoder)
286                 return -ENOMEM;
287 
288         connector = tfp410_connector_create(dev, tfp410_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 tfp410_destroy(struct tilcdc_module *mod)
299 {
300         struct tfp410_module *tfp410_mod = to_tfp410_module(mod);
301 
302         if (tfp410_mod->i2c)
303                 i2c_put_adapter(tfp410_mod->i2c);
304 
305         if (!IS_ERR_VALUE(tfp410_mod->gpio))
306                 gpio_free(tfp410_mod->gpio);
307 
308         tilcdc_module_cleanup(mod);
309         kfree(tfp410_mod);
310 }
311 
312 static const struct tilcdc_module_ops tfp410_module_ops = {
313                 .modeset_init = tfp410_modeset_init,
314                 .destroy = tfp410_destroy,
315 };
316 
317 /*
318  * Device:
319  */
320 
321 static struct of_device_id tfp410_of_match[];
322 
323 static int tfp410_probe(struct platform_device *pdev)
324 {
325         struct device_node *node = pdev->dev.of_node;
326         struct device_node *i2c_node;
327         struct tfp410_module *tfp410_mod;
328         struct tilcdc_module *mod;
329         struct pinctrl *pinctrl;
330         uint32_t i2c_phandle;
331         int ret = -EINVAL;
332 
333         /* bail out early if no DT data: */
334         if (!node) {
335                 dev_err(&pdev->dev, "device-tree data is missing\n");
336                 return -ENXIO;
337         }
338 
339         tfp410_mod = kzalloc(sizeof(*tfp410_mod), GFP_KERNEL);
340         if (!tfp410_mod)
341                 return -ENOMEM;
342 
343         mod = &tfp410_mod->base;
344 
345         tilcdc_module_init(mod, "tfp410", &tfp410_module_ops);
346 
347         pinctrl = devm_pinctrl_get_select_default(&pdev->dev);
348         if (IS_ERR(pinctrl))
349                 dev_warn(&pdev->dev, "pins are not configured\n");
350 
351         if (of_property_read_u32(node, "i2c", &i2c_phandle)) {
352                 dev_err(&pdev->dev, "could not get i2c bus phandle\n");
353                 goto fail;
354         }
355 
356         mod->preferred_bpp = dvi_info.bpp;
357 
358         i2c_node = of_find_node_by_phandle(i2c_phandle);
359         if (!i2c_node) {
360                 dev_err(&pdev->dev, "could not get i2c bus node\n");
361                 goto fail;
362         }
363 
364         tfp410_mod->i2c = of_find_i2c_adapter_by_node(i2c_node);
365         if (!tfp410_mod->i2c) {
366                 dev_err(&pdev->dev, "could not get i2c\n");
367                 goto fail;
368         }
369 
370         of_node_put(i2c_node);
371 
372         tfp410_mod->gpio = of_get_named_gpio_flags(node, "powerdn-gpio",
373                         0, NULL);
374         if (IS_ERR_VALUE(tfp410_mod->gpio)) {
375                 dev_warn(&pdev->dev, "No power down GPIO\n");
376         } else {
377                 ret = gpio_request(tfp410_mod->gpio, "DVI_PDn");
378                 if (ret) {
379                         dev_err(&pdev->dev, "could not get DVI_PDn gpio\n");
380                         goto fail;
381                 }
382         }
383 
384         return 0;
385 
386 fail:
387         tfp410_destroy(mod);
388         return ret;
389 }
390 
391 static int tfp410_remove(struct platform_device *pdev)
392 {
393         return 0;
394 }
395 
396 static struct of_device_id tfp410_of_match[] = {
397                 { .compatible = "ti,tilcdc,tfp410", },
398                 { },
399 };
400 
401 struct platform_driver tfp410_driver = {
402         .probe = tfp410_probe,
403         .remove = tfp410_remove,
404         .driver = {
405                 .owner = THIS_MODULE,
406                 .name = "tfp410",
407                 .of_match_table = tfp410_of_match,
408         },
409 };
410 
411 int __init tilcdc_tfp410_init(void)
412 {
413         return platform_driver_register(&tfp410_driver);
414 }
415 
416 void __exit tilcdc_tfp410_fini(void)
417 {
418         platform_driver_unregister(&tfp410_driver);
419 }
420 

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