xtensa: fix high memory/reserved memory collision
[cris-mirror.git] / drivers / gpu / drm / omapdrm / displays / panel-sharp-ls037v7dw01.c
blob34555801fa4c1148d8338fa29051591f1789bca3
1 /*
2 * LCD panel driver for Sharp LS037V7DW01
4 * Copyright (C) 2013 Texas Instruments Incorporated - http://www.ti.com/
5 * Author: Tomi Valkeinen <tomi.valkeinen@ti.com>
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.
12 #include <linux/delay.h>
13 #include <linux/gpio/consumer.h>
14 #include <linux/module.h>
15 #include <linux/of.h>
16 #include <linux/platform_device.h>
17 #include <linux/slab.h>
18 #include <linux/regulator/consumer.h>
20 #include "../dss/omapdss.h"
22 struct panel_drv_data {
23 struct omap_dss_device dssdev;
24 struct omap_dss_device *in;
25 struct regulator *vcc;
27 struct videomode vm;
29 struct gpio_desc *resb_gpio; /* low = reset active min 20 us */
30 struct gpio_desc *ini_gpio; /* high = power on */
31 struct gpio_desc *mo_gpio; /* low = 480x640, high = 240x320 */
32 struct gpio_desc *lr_gpio; /* high = conventional horizontal scanning */
33 struct gpio_desc *ud_gpio; /* high = conventional vertical scanning */
36 static const struct videomode sharp_ls_vm = {
37 .hactive = 480,
38 .vactive = 640,
40 .pixelclock = 19200000,
42 .hsync_len = 2,
43 .hfront_porch = 1,
44 .hback_porch = 28,
46 .vsync_len = 1,
47 .vfront_porch = 1,
48 .vback_porch = 1,
50 .flags = DISPLAY_FLAGS_HSYNC_LOW | DISPLAY_FLAGS_VSYNC_LOW |
51 DISPLAY_FLAGS_DE_HIGH | DISPLAY_FLAGS_SYNC_NEGEDGE |
52 DISPLAY_FLAGS_PIXDATA_POSEDGE,
54 * Note: According to the panel documentation:
55 * DATA needs to be driven on the FALLING edge
59 #define to_panel_data(p) container_of(p, struct panel_drv_data, dssdev)
61 static int sharp_ls_connect(struct omap_dss_device *dssdev)
63 struct panel_drv_data *ddata = to_panel_data(dssdev);
64 struct omap_dss_device *in = ddata->in;
65 int r;
67 if (omapdss_device_is_connected(dssdev))
68 return 0;
70 r = in->ops.dpi->connect(in, dssdev);
71 if (r)
72 return r;
74 return 0;
77 static void sharp_ls_disconnect(struct omap_dss_device *dssdev)
79 struct panel_drv_data *ddata = to_panel_data(dssdev);
80 struct omap_dss_device *in = ddata->in;
82 if (!omapdss_device_is_connected(dssdev))
83 return;
85 in->ops.dpi->disconnect(in, dssdev);
88 static int sharp_ls_enable(struct omap_dss_device *dssdev)
90 struct panel_drv_data *ddata = to_panel_data(dssdev);
91 struct omap_dss_device *in = ddata->in;
92 int r;
94 if (!omapdss_device_is_connected(dssdev))
95 return -ENODEV;
97 if (omapdss_device_is_enabled(dssdev))
98 return 0;
100 in->ops.dpi->set_timings(in, &ddata->vm);
102 if (ddata->vcc) {
103 r = regulator_enable(ddata->vcc);
104 if (r != 0)
105 return r;
108 r = in->ops.dpi->enable(in);
109 if (r) {
110 regulator_disable(ddata->vcc);
111 return r;
114 /* wait couple of vsyncs until enabling the LCD */
115 msleep(50);
117 if (ddata->resb_gpio)
118 gpiod_set_value_cansleep(ddata->resb_gpio, 1);
120 if (ddata->ini_gpio)
121 gpiod_set_value_cansleep(ddata->ini_gpio, 1);
123 dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;
125 return 0;
128 static void sharp_ls_disable(struct omap_dss_device *dssdev)
130 struct panel_drv_data *ddata = to_panel_data(dssdev);
131 struct omap_dss_device *in = ddata->in;
133 if (!omapdss_device_is_enabled(dssdev))
134 return;
136 if (ddata->ini_gpio)
137 gpiod_set_value_cansleep(ddata->ini_gpio, 0);
139 if (ddata->resb_gpio)
140 gpiod_set_value_cansleep(ddata->resb_gpio, 0);
142 /* wait at least 5 vsyncs after disabling the LCD */
144 msleep(100);
146 in->ops.dpi->disable(in);
148 if (ddata->vcc)
149 regulator_disable(ddata->vcc);
151 dssdev->state = OMAP_DSS_DISPLAY_DISABLED;
154 static void sharp_ls_set_timings(struct omap_dss_device *dssdev,
155 struct videomode *vm)
157 struct panel_drv_data *ddata = to_panel_data(dssdev);
158 struct omap_dss_device *in = ddata->in;
160 ddata->vm = *vm;
161 dssdev->panel.vm = *vm;
163 in->ops.dpi->set_timings(in, vm);
166 static void sharp_ls_get_timings(struct omap_dss_device *dssdev,
167 struct videomode *vm)
169 struct panel_drv_data *ddata = to_panel_data(dssdev);
171 *vm = ddata->vm;
174 static int sharp_ls_check_timings(struct omap_dss_device *dssdev,
175 struct videomode *vm)
177 struct panel_drv_data *ddata = to_panel_data(dssdev);
178 struct omap_dss_device *in = ddata->in;
180 return in->ops.dpi->check_timings(in, vm);
183 static struct omap_dss_driver sharp_ls_ops = {
184 .connect = sharp_ls_connect,
185 .disconnect = sharp_ls_disconnect,
187 .enable = sharp_ls_enable,
188 .disable = sharp_ls_disable,
190 .set_timings = sharp_ls_set_timings,
191 .get_timings = sharp_ls_get_timings,
192 .check_timings = sharp_ls_check_timings,
195 static int sharp_ls_get_gpio_of(struct device *dev, int index, int val,
196 const char *desc, struct gpio_desc **gpiod)
198 struct gpio_desc *gd;
200 *gpiod = NULL;
202 gd = devm_gpiod_get_index(dev, desc, index, GPIOD_OUT_LOW);
203 if (IS_ERR(gd))
204 return PTR_ERR(gd);
206 *gpiod = gd;
207 return 0;
210 static int sharp_ls_probe_of(struct platform_device *pdev)
212 struct panel_drv_data *ddata = platform_get_drvdata(pdev);
213 struct device_node *node = pdev->dev.of_node;
214 struct omap_dss_device *in;
215 int r;
217 ddata->vcc = devm_regulator_get(&pdev->dev, "envdd");
218 if (IS_ERR(ddata->vcc)) {
219 dev_err(&pdev->dev, "failed to get regulator\n");
220 return PTR_ERR(ddata->vcc);
223 /* lcd INI */
224 r = sharp_ls_get_gpio_of(&pdev->dev, 0, 0, "enable", &ddata->ini_gpio);
225 if (r)
226 return r;
228 /* lcd RESB */
229 r = sharp_ls_get_gpio_of(&pdev->dev, 0, 0, "reset", &ddata->resb_gpio);
230 if (r)
231 return r;
233 /* lcd MO */
234 r = sharp_ls_get_gpio_of(&pdev->dev, 0, 0, "mode", &ddata->mo_gpio);
235 if (r)
236 return r;
238 /* lcd LR */
239 r = sharp_ls_get_gpio_of(&pdev->dev, 1, 1, "mode", &ddata->lr_gpio);
240 if (r)
241 return r;
243 /* lcd UD */
244 r = sharp_ls_get_gpio_of(&pdev->dev, 2, 1, "mode", &ddata->ud_gpio);
245 if (r)
246 return r;
248 in = omapdss_of_find_source_for_first_ep(node);
249 if (IS_ERR(in)) {
250 dev_err(&pdev->dev, "failed to find video source\n");
251 return PTR_ERR(in);
254 ddata->in = in;
256 return 0;
259 static int sharp_ls_probe(struct platform_device *pdev)
261 struct panel_drv_data *ddata;
262 struct omap_dss_device *dssdev;
263 int r;
265 ddata = devm_kzalloc(&pdev->dev, sizeof(*ddata), GFP_KERNEL);
266 if (ddata == NULL)
267 return -ENOMEM;
269 platform_set_drvdata(pdev, ddata);
271 if (!pdev->dev.of_node)
272 return -ENODEV;
274 r = sharp_ls_probe_of(pdev);
275 if (r)
276 return r;
278 ddata->vm = sharp_ls_vm;
280 dssdev = &ddata->dssdev;
281 dssdev->dev = &pdev->dev;
282 dssdev->driver = &sharp_ls_ops;
283 dssdev->type = OMAP_DISPLAY_TYPE_DPI;
284 dssdev->owner = THIS_MODULE;
285 dssdev->panel.vm = ddata->vm;
287 r = omapdss_register_display(dssdev);
288 if (r) {
289 dev_err(&pdev->dev, "Failed to register panel\n");
290 goto err_reg;
293 return 0;
295 err_reg:
296 omap_dss_put_device(ddata->in);
297 return r;
300 static int __exit sharp_ls_remove(struct platform_device *pdev)
302 struct panel_drv_data *ddata = platform_get_drvdata(pdev);
303 struct omap_dss_device *dssdev = &ddata->dssdev;
304 struct omap_dss_device *in = ddata->in;
306 omapdss_unregister_display(dssdev);
308 sharp_ls_disable(dssdev);
309 sharp_ls_disconnect(dssdev);
311 omap_dss_put_device(in);
313 return 0;
316 static const struct of_device_id sharp_ls_of_match[] = {
317 { .compatible = "omapdss,sharp,ls037v7dw01", },
321 MODULE_DEVICE_TABLE(of, sharp_ls_of_match);
323 static struct platform_driver sharp_ls_driver = {
324 .probe = sharp_ls_probe,
325 .remove = __exit_p(sharp_ls_remove),
326 .driver = {
327 .name = "panel-sharp-ls037v7dw01",
328 .of_match_table = sharp_ls_of_match,
329 .suppress_bind_attrs = true,
333 module_platform_driver(sharp_ls_driver);
335 MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@ti.com>");
336 MODULE_DESCRIPTION("Sharp LS037V7DW01 Panel Driver");
337 MODULE_LICENSE("GPL");