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 #include <drm/drm_atomic_helper.h>
24
25 #include "tilcdc_drv.h"
26 #include "tilcdc_tfp410.h"
27
28 struct tfp410_module {
29 struct tilcdc_module base;
30 struct i2c_adapter *i2c;
31 int gpio;
32 };
33 #define to_tfp410_module(x) container_of(x, struct tfp410_module, base)
34
35
36 static const struct tilcdc_panel_info dvi_info = {
37 .ac_bias = 255,
38 .ac_bias_intrpt = 0,
39 .dma_burst_sz = 16,
40 .bpp = 16,
41 .fdd = 0x80,
42 .tft_alt_mode = 0,
43 .sync_edge = 0,
44 .sync_ctrl = 1,
45 .raster_order = 0,
46 };
47
48 /*
49 * Encoder:
50 */
51
52 struct tfp410_encoder {
53 struct drm_encoder base;
54 struct tfp410_module *mod;
55 int dpms;
56 };
57 #define to_tfp410_encoder(x) container_of(x, struct tfp410_encoder, base)
58
tfp410_encoder_dpms(struct drm_encoder * encoder,int mode)59 static void tfp410_encoder_dpms(struct drm_encoder *encoder, int mode)
60 {
61 struct tfp410_encoder *tfp410_encoder = to_tfp410_encoder(encoder);
62
63 if (tfp410_encoder->dpms == mode)
64 return;
65
66 if (mode == DRM_MODE_DPMS_ON) {
67 DBG("Power on");
68 gpio_direction_output(tfp410_encoder->mod->gpio, 1);
69 } else {
70 DBG("Power off");
71 gpio_direction_output(tfp410_encoder->mod->gpio, 0);
72 }
73
74 tfp410_encoder->dpms = mode;
75 }
76
tfp410_encoder_prepare(struct drm_encoder * encoder)77 static void tfp410_encoder_prepare(struct drm_encoder *encoder)
78 {
79 tfp410_encoder_dpms(encoder, DRM_MODE_DPMS_OFF);
80 }
81
tfp410_encoder_commit(struct drm_encoder * encoder)82 static void tfp410_encoder_commit(struct drm_encoder *encoder)
83 {
84 tfp410_encoder_dpms(encoder, DRM_MODE_DPMS_ON);
85 }
86
tfp410_encoder_mode_set(struct drm_encoder * encoder,struct drm_display_mode * mode,struct drm_display_mode * adjusted_mode)87 static void tfp410_encoder_mode_set(struct drm_encoder *encoder,
88 struct drm_display_mode *mode,
89 struct drm_display_mode *adjusted_mode)
90 {
91 /* nothing needed */
92 }
93
94 static const struct drm_encoder_funcs tfp410_encoder_funcs = {
95 .destroy = drm_encoder_cleanup,
96 };
97
98 static const struct drm_encoder_helper_funcs tfp410_encoder_helper_funcs = {
99 .dpms = tfp410_encoder_dpms,
100 .prepare = tfp410_encoder_prepare,
101 .commit = tfp410_encoder_commit,
102 .mode_set = tfp410_encoder_mode_set,
103 };
104
tfp410_encoder_create(struct drm_device * dev,struct tfp410_module * mod)105 static struct drm_encoder *tfp410_encoder_create(struct drm_device *dev,
106 struct tfp410_module *mod)
107 {
108 struct tfp410_encoder *tfp410_encoder;
109 struct drm_encoder *encoder;
110 int ret;
111
112 tfp410_encoder = devm_kzalloc(dev->dev, sizeof(*tfp410_encoder),
113 GFP_KERNEL);
114 if (!tfp410_encoder)
115 return NULL;
116
117 tfp410_encoder->dpms = DRM_MODE_DPMS_OFF;
118 tfp410_encoder->mod = mod;
119
120 encoder = &tfp410_encoder->base;
121 encoder->possible_crtcs = 1;
122
123 ret = drm_encoder_init(dev, encoder, &tfp410_encoder_funcs,
124 DRM_MODE_ENCODER_TMDS, NULL);
125 if (ret < 0)
126 goto fail;
127
128 drm_encoder_helper_add(encoder, &tfp410_encoder_helper_funcs);
129
130 return encoder;
131
132 fail:
133 drm_encoder_cleanup(encoder);
134 return NULL;
135 }
136
137 /*
138 * Connector:
139 */
140
141 struct tfp410_connector {
142 struct drm_connector base;
143
144 struct drm_encoder *encoder; /* our connected encoder */
145 struct tfp410_module *mod;
146 };
147 #define to_tfp410_connector(x) container_of(x, struct tfp410_connector, base)
148
149
tfp410_connector_destroy(struct drm_connector * connector)150 static void tfp410_connector_destroy(struct drm_connector *connector)
151 {
152 drm_connector_unregister(connector);
153 drm_connector_cleanup(connector);
154 }
155
tfp410_connector_detect(struct drm_connector * connector,bool force)156 static enum drm_connector_status tfp410_connector_detect(
157 struct drm_connector *connector,
158 bool force)
159 {
160 struct tfp410_connector *tfp410_connector = to_tfp410_connector(connector);
161
162 if (drm_probe_ddc(tfp410_connector->mod->i2c))
163 return connector_status_connected;
164
165 return connector_status_unknown;
166 }
167
tfp410_connector_get_modes(struct drm_connector * connector)168 static int tfp410_connector_get_modes(struct drm_connector *connector)
169 {
170 struct tfp410_connector *tfp410_connector = to_tfp410_connector(connector);
171 struct edid *edid;
172 int ret = 0;
173
174 edid = drm_get_edid(connector, tfp410_connector->mod->i2c);
175
176 drm_connector_update_edid_property(connector, edid);
177
178 if (edid) {
179 ret = drm_add_edid_modes(connector, edid);
180 kfree(edid);
181 }
182
183 return ret;
184 }
185
tfp410_connector_mode_valid(struct drm_connector * connector,struct drm_display_mode * mode)186 static int tfp410_connector_mode_valid(struct drm_connector *connector,
187 struct drm_display_mode *mode)
188 {
189 struct tilcdc_drm_private *priv = connector->dev->dev_private;
190 /* our only constraints are what the crtc can generate: */
191 return tilcdc_crtc_mode_valid(priv->crtc, mode);
192 }
193
tfp410_connector_best_encoder(struct drm_connector * connector)194 static struct drm_encoder *tfp410_connector_best_encoder(
195 struct drm_connector *connector)
196 {
197 struct tfp410_connector *tfp410_connector = to_tfp410_connector(connector);
198 return tfp410_connector->encoder;
199 }
200
201 static const struct drm_connector_funcs tfp410_connector_funcs = {
202 .destroy = tfp410_connector_destroy,
203 .detect = tfp410_connector_detect,
204 .fill_modes = drm_helper_probe_single_connector_modes,
205 .reset = drm_atomic_helper_connector_reset,
206 .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
207 .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
208 };
209
210 static const struct drm_connector_helper_funcs tfp410_connector_helper_funcs = {
211 .get_modes = tfp410_connector_get_modes,
212 .mode_valid = tfp410_connector_mode_valid,
213 .best_encoder = tfp410_connector_best_encoder,
214 };
215
tfp410_connector_create(struct drm_device * dev,struct tfp410_module * mod,struct drm_encoder * encoder)216 static struct drm_connector *tfp410_connector_create(struct drm_device *dev,
217 struct tfp410_module *mod, struct drm_encoder *encoder)
218 {
219 struct tfp410_connector *tfp410_connector;
220 struct drm_connector *connector;
221 int ret;
222
223 tfp410_connector = devm_kzalloc(dev->dev, sizeof(*tfp410_connector),
224 GFP_KERNEL);
225 if (!tfp410_connector)
226 return NULL;
227
228 tfp410_connector->encoder = encoder;
229 tfp410_connector->mod = mod;
230
231 connector = &tfp410_connector->base;
232
233 drm_connector_init(dev, connector, &tfp410_connector_funcs,
234 DRM_MODE_CONNECTOR_DVID);
235 drm_connector_helper_add(connector, &tfp410_connector_helper_funcs);
236
237 connector->polled = DRM_CONNECTOR_POLL_CONNECT |
238 DRM_CONNECTOR_POLL_DISCONNECT;
239
240 connector->interlace_allowed = 0;
241 connector->doublescan_allowed = 0;
242
243 ret = drm_connector_attach_encoder(connector, encoder);
244 if (ret)
245 goto fail;
246
247 return connector;
248
249 fail:
250 tfp410_connector_destroy(connector);
251 return NULL;
252 }
253
254 /*
255 * Module:
256 */
257
tfp410_modeset_init(struct tilcdc_module * mod,struct drm_device * dev)258 static int tfp410_modeset_init(struct tilcdc_module *mod, struct drm_device *dev)
259 {
260 struct tfp410_module *tfp410_mod = to_tfp410_module(mod);
261 struct tilcdc_drm_private *priv = dev->dev_private;
262 struct drm_encoder *encoder;
263 struct drm_connector *connector;
264
265 encoder = tfp410_encoder_create(dev, tfp410_mod);
266 if (!encoder)
267 return -ENOMEM;
268
269 connector = tfp410_connector_create(dev, tfp410_mod, encoder);
270 if (!connector)
271 return -ENOMEM;
272
273 priv->encoders[priv->num_encoders++] = encoder;
274 priv->connectors[priv->num_connectors++] = connector;
275
276 tilcdc_crtc_set_panel_info(priv->crtc, &dvi_info);
277 return 0;
278 }
279
280 static const struct tilcdc_module_ops tfp410_module_ops = {
281 .modeset_init = tfp410_modeset_init,
282 };
283
284 /*
285 * Device:
286 */
287
tfp410_probe(struct platform_device * pdev)288 static int tfp410_probe(struct platform_device *pdev)
289 {
290 struct device_node *node = pdev->dev.of_node;
291 struct device_node *i2c_node;
292 struct tfp410_module *tfp410_mod;
293 struct tilcdc_module *mod;
294 struct pinctrl *pinctrl;
295 uint32_t i2c_phandle;
296 int ret = -EINVAL;
297
298 /* bail out early if no DT data: */
299 if (!node) {
300 dev_err(&pdev->dev, "device-tree data is missing\n");
301 return -ENXIO;
302 }
303
304 tfp410_mod = devm_kzalloc(&pdev->dev, sizeof(*tfp410_mod), GFP_KERNEL);
305 if (!tfp410_mod)
306 return -ENOMEM;
307
308 mod = &tfp410_mod->base;
309 pdev->dev.platform_data = mod;
310
311 tilcdc_module_init(mod, "tfp410", &tfp410_module_ops);
312
313 pinctrl = devm_pinctrl_get_select_default(&pdev->dev);
314 if (IS_ERR(pinctrl))
315 dev_warn(&pdev->dev, "pins are not configured\n");
316
317 if (of_property_read_u32(node, "i2c", &i2c_phandle)) {
318 dev_err(&pdev->dev, "could not get i2c bus phandle\n");
319 goto fail;
320 }
321
322 i2c_node = of_find_node_by_phandle(i2c_phandle);
323 if (!i2c_node) {
324 dev_err(&pdev->dev, "could not get i2c bus node\n");
325 goto fail;
326 }
327
328 tfp410_mod->i2c = of_find_i2c_adapter_by_node(i2c_node);
329 if (!tfp410_mod->i2c) {
330 dev_err(&pdev->dev, "could not get i2c\n");
331 of_node_put(i2c_node);
332 goto fail;
333 }
334
335 of_node_put(i2c_node);
336
337 tfp410_mod->gpio = of_get_named_gpio_flags(node, "powerdn-gpio",
338 0, NULL);
339 if (tfp410_mod->gpio < 0) {
340 dev_warn(&pdev->dev, "No power down GPIO\n");
341 } else {
342 ret = gpio_request(tfp410_mod->gpio, "DVI_PDn");
343 if (ret) {
344 dev_err(&pdev->dev, "could not get DVI_PDn gpio\n");
345 goto fail_adapter;
346 }
347 }
348
349 return 0;
350
351 fail_adapter:
352 i2c_put_adapter(tfp410_mod->i2c);
353
354 fail:
355 tilcdc_module_cleanup(mod);
356 return ret;
357 }
358
tfp410_remove(struct platform_device * pdev)359 static int tfp410_remove(struct platform_device *pdev)
360 {
361 struct tilcdc_module *mod = dev_get_platdata(&pdev->dev);
362 struct tfp410_module *tfp410_mod = to_tfp410_module(mod);
363
364 i2c_put_adapter(tfp410_mod->i2c);
365 gpio_free(tfp410_mod->gpio);
366
367 tilcdc_module_cleanup(mod);
368
369 return 0;
370 }
371
372 static const struct of_device_id tfp410_of_match[] = {
373 { .compatible = "ti,tilcdc,tfp410", },
374 { },
375 };
376
377 struct platform_driver tfp410_driver = {
378 .probe = tfp410_probe,
379 .remove = tfp410_remove,
380 .driver = {
381 .owner = THIS_MODULE,
382 .name = "tfp410",
383 .of_match_table = tfp410_of_match,
384 },
385 };
386
tilcdc_tfp410_init(void)387 int __init tilcdc_tfp410_init(void)
388 {
389 return platform_driver_register(&tfp410_driver);
390 }
391
tilcdc_tfp410_fini(void)392 void __exit tilcdc_tfp410_fini(void)
393 {
394 platform_driver_unregister(&tfp410_driver);
395 }
396
