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1 | /* |
2 | * TFP410 DPI-to-DVI encoder driver | |
3 | * | |
4 | * Copyright (C) 2013 Texas Instruments | |
5 | * Author: Tomi Valkeinen <tomi.valkeinen@ti.com> | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify it | |
8 | * under the terms of the GNU General Public License version 2 as published by | |
9 | * the Free Software Foundation. | |
10 | */ | |
11 | ||
12 | #include <linux/gpio.h> | |
13 | #include <linux/module.h> | |
14 | #include <linux/platform_device.h> | |
15 | #include <linux/slab.h> | |
cfa71144 | 16 | #include <linux/of_gpio.h> |
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17 | |
18 | #include <video/omapdss.h> | |
19 | #include <video/omap-panel-data.h> | |
20 | ||
21 | struct panel_drv_data { | |
22 | struct omap_dss_device dssdev; | |
23 | struct omap_dss_device *in; | |
24 | ||
25 | int pd_gpio; | |
26 | int data_lines; | |
27 | ||
28 | struct omap_video_timings timings; | |
29 | }; | |
30 | ||
31 | #define to_panel_data(x) container_of(x, struct panel_drv_data, dssdev) | |
32 | ||
33 | static int tfp410_connect(struct omap_dss_device *dssdev, | |
34 | struct omap_dss_device *dst) | |
35 | { | |
36 | struct panel_drv_data *ddata = to_panel_data(dssdev); | |
37 | struct omap_dss_device *in = ddata->in; | |
38 | int r; | |
39 | ||
40 | if (omapdss_device_is_connected(dssdev)) | |
41 | return -EBUSY; | |
42 | ||
43 | r = in->ops.dpi->connect(in, dssdev); | |
44 | if (r) | |
45 | return r; | |
46 | ||
a73fdc64 | 47 | dst->src = dssdev; |
9560dc10 | 48 | dssdev->dst = dst; |
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49 | |
50 | return 0; | |
51 | } | |
52 | ||
53 | static void tfp410_disconnect(struct omap_dss_device *dssdev, | |
54 | struct omap_dss_device *dst) | |
55 | { | |
56 | struct panel_drv_data *ddata = to_panel_data(dssdev); | |
57 | struct omap_dss_device *in = ddata->in; | |
58 | ||
59 | WARN_ON(!omapdss_device_is_connected(dssdev)); | |
60 | if (!omapdss_device_is_connected(dssdev)) | |
61 | return; | |
62 | ||
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63 | WARN_ON(dst != dssdev->dst); |
64 | if (dst != dssdev->dst) | |
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65 | return; |
66 | ||
a73fdc64 | 67 | dst->src = NULL; |
9560dc10 | 68 | dssdev->dst = NULL; |
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69 | |
70 | in->ops.dpi->disconnect(in, &ddata->dssdev); | |
71 | } | |
72 | ||
73 | static int tfp410_enable(struct omap_dss_device *dssdev) | |
74 | { | |
75 | struct panel_drv_data *ddata = to_panel_data(dssdev); | |
76 | struct omap_dss_device *in = ddata->in; | |
77 | int r; | |
78 | ||
79 | if (!omapdss_device_is_connected(dssdev)) | |
80 | return -ENODEV; | |
81 | ||
82 | if (omapdss_device_is_enabled(dssdev)) | |
83 | return 0; | |
84 | ||
85 | in->ops.dpi->set_timings(in, &ddata->timings); | |
cfa71144 TV |
86 | if (ddata->data_lines) |
87 | in->ops.dpi->set_data_lines(in, ddata->data_lines); | |
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88 | |
89 | r = in->ops.dpi->enable(in); | |
90 | if (r) | |
91 | return r; | |
92 | ||
93 | if (gpio_is_valid(ddata->pd_gpio)) | |
94 | gpio_set_value_cansleep(ddata->pd_gpio, 1); | |
95 | ||
96 | dssdev->state = OMAP_DSS_DISPLAY_ACTIVE; | |
97 | ||
98 | return 0; | |
99 | } | |
100 | ||
101 | static void tfp410_disable(struct omap_dss_device *dssdev) | |
102 | { | |
103 | struct panel_drv_data *ddata = to_panel_data(dssdev); | |
104 | struct omap_dss_device *in = ddata->in; | |
105 | ||
106 | if (!omapdss_device_is_enabled(dssdev)) | |
107 | return; | |
108 | ||
109 | if (gpio_is_valid(ddata->pd_gpio)) | |
110 | gpio_set_value_cansleep(ddata->pd_gpio, 0); | |
111 | ||
112 | in->ops.dpi->disable(in); | |
113 | ||
114 | dssdev->state = OMAP_DSS_DISPLAY_DISABLED; | |
115 | } | |
116 | ||
117 | static void tfp410_set_timings(struct omap_dss_device *dssdev, | |
118 | struct omap_video_timings *timings) | |
119 | { | |
120 | struct panel_drv_data *ddata = to_panel_data(dssdev); | |
121 | struct omap_dss_device *in = ddata->in; | |
122 | ||
123 | ddata->timings = *timings; | |
124 | dssdev->panel.timings = *timings; | |
125 | ||
126 | in->ops.dpi->set_timings(in, timings); | |
127 | } | |
128 | ||
129 | static void tfp410_get_timings(struct omap_dss_device *dssdev, | |
130 | struct omap_video_timings *timings) | |
131 | { | |
132 | struct panel_drv_data *ddata = to_panel_data(dssdev); | |
133 | ||
134 | *timings = ddata->timings; | |
135 | } | |
136 | ||
137 | static int tfp410_check_timings(struct omap_dss_device *dssdev, | |
138 | struct omap_video_timings *timings) | |
139 | { | |
140 | struct panel_drv_data *ddata = to_panel_data(dssdev); | |
141 | struct omap_dss_device *in = ddata->in; | |
142 | ||
143 | return in->ops.dpi->check_timings(in, timings); | |
144 | } | |
145 | ||
146 | static const struct omapdss_dvi_ops tfp410_dvi_ops = { | |
147 | .connect = tfp410_connect, | |
148 | .disconnect = tfp410_disconnect, | |
149 | ||
150 | .enable = tfp410_enable, | |
151 | .disable = tfp410_disable, | |
152 | ||
153 | .check_timings = tfp410_check_timings, | |
154 | .set_timings = tfp410_set_timings, | |
155 | .get_timings = tfp410_get_timings, | |
156 | }; | |
157 | ||
158 | static int tfp410_probe_pdata(struct platform_device *pdev) | |
159 | { | |
160 | struct panel_drv_data *ddata = platform_get_drvdata(pdev); | |
161 | struct encoder_tfp410_platform_data *pdata; | |
162 | struct omap_dss_device *dssdev, *in; | |
163 | ||
164 | pdata = dev_get_platdata(&pdev->dev); | |
165 | ||
166 | ddata->pd_gpio = pdata->power_down_gpio; | |
167 | ||
168 | ddata->data_lines = pdata->data_lines; | |
169 | ||
170 | in = omap_dss_find_output(pdata->source); | |
171 | if (in == NULL) { | |
172 | dev_err(&pdev->dev, "Failed to find video source\n"); | |
173 | return -ENODEV; | |
174 | } | |
175 | ||
176 | ddata->in = in; | |
177 | ||
178 | dssdev = &ddata->dssdev; | |
179 | dssdev->name = pdata->name; | |
180 | ||
181 | return 0; | |
182 | } | |
183 | ||
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184 | static int tfp410_probe_of(struct platform_device *pdev) |
185 | { | |
186 | struct panel_drv_data *ddata = platform_get_drvdata(pdev); | |
187 | struct device_node *node = pdev->dev.of_node; | |
188 | struct omap_dss_device *in; | |
189 | int gpio; | |
190 | ||
191 | gpio = of_get_named_gpio(node, "powerdown-gpios", 0); | |
192 | ||
193 | if (gpio_is_valid(gpio) || gpio == -ENOENT) { | |
194 | ddata->pd_gpio = gpio; | |
195 | } else { | |
196 | dev_err(&pdev->dev, "failed to parse PD gpio\n"); | |
197 | return gpio; | |
198 | } | |
199 | ||
200 | in = omapdss_of_find_source_for_first_ep(node); | |
201 | if (IS_ERR(in)) { | |
202 | dev_err(&pdev->dev, "failed to find video source\n"); | |
203 | return PTR_ERR(in); | |
204 | } | |
205 | ||
206 | ddata->in = in; | |
207 | ||
208 | return 0; | |
209 | } | |
210 | ||
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211 | static int tfp410_probe(struct platform_device *pdev) |
212 | { | |
213 | struct panel_drv_data *ddata; | |
214 | struct omap_dss_device *dssdev; | |
215 | int r; | |
216 | ||
217 | ddata = devm_kzalloc(&pdev->dev, sizeof(*ddata), GFP_KERNEL); | |
218 | if (!ddata) | |
219 | return -ENOMEM; | |
220 | ||
221 | platform_set_drvdata(pdev, ddata); | |
222 | ||
223 | if (dev_get_platdata(&pdev->dev)) { | |
224 | r = tfp410_probe_pdata(pdev); | |
225 | if (r) | |
226 | return r; | |
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227 | } else if (pdev->dev.of_node) { |
228 | r = tfp410_probe_of(pdev); | |
229 | if (r) | |
230 | return r; | |
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231 | } else { |
232 | return -ENODEV; | |
233 | } | |
234 | ||
235 | if (gpio_is_valid(ddata->pd_gpio)) { | |
236 | r = devm_gpio_request_one(&pdev->dev, ddata->pd_gpio, | |
237 | GPIOF_OUT_INIT_LOW, "tfp410 PD"); | |
238 | if (r) { | |
239 | dev_err(&pdev->dev, "Failed to request PD GPIO %d\n", | |
240 | ddata->pd_gpio); | |
241 | goto err_gpio; | |
242 | } | |
243 | } | |
244 | ||
245 | dssdev = &ddata->dssdev; | |
246 | dssdev->ops.dvi = &tfp410_dvi_ops; | |
247 | dssdev->dev = &pdev->dev; | |
248 | dssdev->type = OMAP_DISPLAY_TYPE_DPI; | |
249 | dssdev->output_type = OMAP_DISPLAY_TYPE_DVI; | |
250 | dssdev->owner = THIS_MODULE; | |
251 | dssdev->phy.dpi.data_lines = ddata->data_lines; | |
252 | ||
253 | r = omapdss_register_output(dssdev); | |
254 | if (r) { | |
255 | dev_err(&pdev->dev, "Failed to register output\n"); | |
256 | goto err_reg; | |
257 | } | |
258 | ||
259 | return 0; | |
260 | err_reg: | |
261 | err_gpio: | |
262 | omap_dss_put_device(ddata->in); | |
263 | return r; | |
264 | } | |
265 | ||
266 | static int __exit tfp410_remove(struct platform_device *pdev) | |
267 | { | |
268 | struct panel_drv_data *ddata = platform_get_drvdata(pdev); | |
269 | struct omap_dss_device *dssdev = &ddata->dssdev; | |
270 | struct omap_dss_device *in = ddata->in; | |
271 | ||
272 | omapdss_unregister_output(&ddata->dssdev); | |
273 | ||
274 | WARN_ON(omapdss_device_is_enabled(dssdev)); | |
275 | if (omapdss_device_is_enabled(dssdev)) | |
276 | tfp410_disable(dssdev); | |
277 | ||
278 | WARN_ON(omapdss_device_is_connected(dssdev)); | |
279 | if (omapdss_device_is_connected(dssdev)) | |
9560dc10 | 280 | tfp410_disconnect(dssdev, dssdev->dst); |
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281 | |
282 | omap_dss_put_device(in); | |
283 | ||
284 | return 0; | |
285 | } | |
286 | ||
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287 | static const struct of_device_id tfp410_of_match[] = { |
288 | { .compatible = "omapdss,ti,tfp410", }, | |
289 | {}, | |
290 | }; | |
291 | ||
292 | MODULE_DEVICE_TABLE(of, tfp410_of_match); | |
293 | ||
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294 | static struct platform_driver tfp410_driver = { |
295 | .probe = tfp410_probe, | |
296 | .remove = __exit_p(tfp410_remove), | |
297 | .driver = { | |
298 | .name = "tfp410", | |
299 | .owner = THIS_MODULE, | |
cfa71144 | 300 | .of_match_table = tfp410_of_match, |
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301 | }, |
302 | }; | |
303 | ||
304 | module_platform_driver(tfp410_driver); | |
305 | ||
306 | MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@ti.com>"); | |
307 | MODULE_DESCRIPTION("TFP410 DPI to DVI encoder driver"); | |
308 | MODULE_LICENSE("GPL"); |