1// SPDX-License-Identifier: GPL-2.0
  2/*
  3 * Copyright (C) 2017 NXP Semiconductors.
  4 * Author: Marco Franchi <marco.franchi@nxp.com>
  5 *
  6 * Based on Panel Simple driver by Thierry Reding <treding@nvidia.com>
  7 */
  8
  9#include <linux/delay.h>
 10#include <linux/gpio/consumer.h>
 11#include <linux/media-bus-format.h>
 12#include <linux/module.h>
 13#include <linux/of.h>
 14#include <linux/platform_device.h>
 15#include <linux/regulator/consumer.h>
 16
 17#include <video/display_timing.h>
 18#include <video/videomode.h>
 19
 20#include <drm/drm_crtc.h>
 21#include <drm/drm_device.h>
 22#include <drm/drm_panel.h>
 23
 24struct seiko_panel_desc {
 25	const struct drm_display_mode *modes;
 26	unsigned int num_modes;
 27	const struct display_timing *timings;
 28	unsigned int num_timings;
 29
 30	unsigned int bpc;
 31
 32	/**
 33	 * @width: width (in millimeters) of the panel's active display area
 34	 * @height: height (in millimeters) of the panel's active display area
 35	 */
 36	struct {
 37		unsigned int width;
 38		unsigned int height;
 39	} size;
 40
 41	u32 bus_format;
 42	u32 bus_flags;
 43};
 44
 45struct seiko_panel {
 46	struct drm_panel base;
 47	const struct seiko_panel_desc *desc;
 48	struct regulator *dvdd;
 49	struct regulator *avdd;
 50	struct gpio_desc *enable_gpio;
 51};
 52
 53static inline struct seiko_panel *to_seiko_panel(struct drm_panel *panel)
 54{
 55	return container_of(panel, struct seiko_panel, base);
 56}
 57
 58static int seiko_panel_get_fixed_modes(struct seiko_panel *panel,
 59				       struct drm_connector *connector)
 60{
 61	struct drm_display_mode *mode;
 62	unsigned int i, num = 0;
 63
 64	if (!panel->desc)
 65		return 0;
 66
 67	for (i = 0; i < panel->desc->num_timings; i++) {
 68		const struct display_timing *dt = &panel->desc->timings[i];
 69		struct videomode vm;
 70
 71		videomode_from_timing(dt, &vm);
 72		mode = drm_mode_create(connector->dev);
 73		if (!mode) {
 74			dev_err(panel->base.dev, "failed to add mode %ux%u\n",
 75				dt->hactive.typ, dt->vactive.typ);
 76			continue;
 77		}
 78
 79		drm_display_mode_from_videomode(&vm, mode);
 80
 81		mode->type |= DRM_MODE_TYPE_DRIVER;
 82
 83		if (panel->desc->num_timings == 1)
 84			mode->type |= DRM_MODE_TYPE_PREFERRED;
 85
 86		drm_mode_probed_add(connector, mode);
 87		num++;
 88	}
 89
 90	for (i = 0; i < panel->desc->num_modes; i++) {
 91		const struct drm_display_mode *m = &panel->desc->modes[i];
 92
 93		mode = drm_mode_duplicate(connector->dev, m);
 94		if (!mode) {
 95			dev_err(panel->base.dev, "failed to add mode %ux%u@%u\n",
 96				m->hdisplay, m->vdisplay,
 97				drm_mode_vrefresh(m));
 98			continue;
 99		}
100
101		mode->type |= DRM_MODE_TYPE_DRIVER;
102
103		if (panel->desc->num_modes == 1)
104			mode->type |= DRM_MODE_TYPE_PREFERRED;
105
106		drm_mode_set_name(mode);
107
108		drm_mode_probed_add(connector, mode);
109		num++;
110	}
111
112	connector->display_info.bpc = panel->desc->bpc;
113	connector->display_info.width_mm = panel->desc->size.width;
114	connector->display_info.height_mm = panel->desc->size.height;
115	if (panel->desc->bus_format)
116		drm_display_info_set_bus_formats(&connector->display_info,
117						 &panel->desc->bus_format, 1);
118	connector->display_info.bus_flags = panel->desc->bus_flags;
119
120	return num;
121}
122
123static int seiko_panel_unprepare(struct drm_panel *panel)
124{
125	struct seiko_panel *p = to_seiko_panel(panel);
126
127	gpiod_set_value_cansleep(p->enable_gpio, 0);
128
129	regulator_disable(p->avdd);
130
131	/* Add a 100ms delay as per the panel datasheet */
132	msleep(100);
133
134	regulator_disable(p->dvdd);
135
136	return 0;
137}
138
139static int seiko_panel_prepare(struct drm_panel *panel)
140{
141	struct seiko_panel *p = to_seiko_panel(panel);
142	int err;
143
144	err = regulator_enable(p->dvdd);
145	if (err < 0) {
146		dev_err(panel->dev, "failed to enable dvdd: %d\n", err);
147		return err;
148	}
149
150	/* Add a 100ms delay as per the panel datasheet */
151	msleep(100);
152
153	err = regulator_enable(p->avdd);
154	if (err < 0) {
155		dev_err(panel->dev, "failed to enable avdd: %d\n", err);
156		goto disable_dvdd;
157	}
158
159	gpiod_set_value_cansleep(p->enable_gpio, 1);
160
161	return 0;
162
163disable_dvdd:
164	regulator_disable(p->dvdd);
165	return err;
166}
167
168static int seiko_panel_get_modes(struct drm_panel *panel,
169				 struct drm_connector *connector)
170{
171	struct seiko_panel *p = to_seiko_panel(panel);
172
173	/* add hard-coded panel modes */
174	return seiko_panel_get_fixed_modes(p, connector);
175}
176
177static int seiko_panel_get_timings(struct drm_panel *panel,
178				    unsigned int num_timings,
179				    struct display_timing *timings)
180{
181	struct seiko_panel *p = to_seiko_panel(panel);
182	unsigned int i;
183
184	if (p->desc->num_timings < num_timings)
185		num_timings = p->desc->num_timings;
186
187	if (timings)
188		for (i = 0; i < num_timings; i++)
189			timings[i] = p->desc->timings[i];
190
191	return p->desc->num_timings;
192}
193
194static const struct drm_panel_funcs seiko_panel_funcs = {
195	.unprepare = seiko_panel_unprepare,
196	.prepare = seiko_panel_prepare,
197	.get_modes = seiko_panel_get_modes,
198	.get_timings = seiko_panel_get_timings,
199};
200
201static int seiko_panel_probe(struct device *dev,
202					const struct seiko_panel_desc *desc)
203{
204	struct seiko_panel *panel;
205	int err;
206
207	panel = devm_kzalloc(dev, sizeof(*panel), GFP_KERNEL);
208	if (!panel)
209		return -ENOMEM;
210
211	panel->desc = desc;
212
213	panel->dvdd = devm_regulator_get(dev, "dvdd");
214	if (IS_ERR(panel->dvdd))
215		return PTR_ERR(panel->dvdd);
216
217	panel->avdd = devm_regulator_get(dev, "avdd");
218	if (IS_ERR(panel->avdd))
219		return PTR_ERR(panel->avdd);
220
221	panel->enable_gpio = devm_gpiod_get_optional(dev, "enable",
222						     GPIOD_OUT_LOW);
223	if (IS_ERR(panel->enable_gpio))
224		return dev_err_probe(dev, PTR_ERR(panel->enable_gpio),
225				     "failed to request GPIO\n");
226
227	drm_panel_init(&panel->base, dev, &seiko_panel_funcs,
228		       DRM_MODE_CONNECTOR_DPI);
229
230	err = drm_panel_of_backlight(&panel->base);
231	if (err)
232		return err;
233
234	drm_panel_add(&panel->base);
235
236	dev_set_drvdata(dev, panel);
237
238	return 0;
239}
240
241static void seiko_panel_remove(struct platform_device *pdev)
242{
243	struct seiko_panel *panel = platform_get_drvdata(pdev);
244
245	drm_panel_remove(&panel->base);
246}
247
248static const struct display_timing seiko_43wvf1g_timing = {
249	.pixelclock = { 33500000, 33500000, 33500000 },
250	.hactive = { 800, 800, 800 },
251	.hfront_porch = {  164, 164, 164 },
252	.hback_porch = { 89, 89, 89 },
253	.hsync_len = { 10, 10, 10 },
254	.vactive = { 480, 480, 480 },
255	.vfront_porch = { 10, 10, 10 },
256	.vback_porch = { 23, 23, 23 },
257	.vsync_len = { 10, 10, 10 },
258	.flags = DISPLAY_FLAGS_DE_LOW,
259};
260
261static const struct seiko_panel_desc seiko_43wvf1g = {
262	.timings = &seiko_43wvf1g_timing,
263	.num_timings = 1,
264	.bpc = 8,
265	.size = {
266		.width = 93,
267		.height = 57,
268	},
269	.bus_format = MEDIA_BUS_FMT_RGB888_1X24,
270	.bus_flags = DRM_BUS_FLAG_DE_HIGH | DRM_BUS_FLAG_PIXDATA_DRIVE_NEGEDGE,
271};
272
273static const struct of_device_id platform_of_match[] = {
274	{
275		.compatible = "sii,43wvf1g",
276		.data = &seiko_43wvf1g,
277	}, {
278		/* sentinel */
279	}
280};
281MODULE_DEVICE_TABLE(of, platform_of_match);
282
283static int seiko_panel_platform_probe(struct platform_device *pdev)
284{
285	const struct of_device_id *id;
286
287	id = of_match_node(platform_of_match, pdev->dev.of_node);
288	if (!id)
289		return -ENODEV;
290
291	return seiko_panel_probe(&pdev->dev, id->data);
292}
293
294static struct platform_driver seiko_panel_platform_driver = {
295	.driver = {
296		.name = "seiko_panel",
297		.of_match_table = platform_of_match,
298	},
299	.probe = seiko_panel_platform_probe,
300	.remove = seiko_panel_remove,
301};
302module_platform_driver(seiko_panel_platform_driver);
303
304MODULE_AUTHOR("Marco Franchi <marco.franchi@nxp.com>");
305MODULE_DESCRIPTION("Seiko 43WVF1G panel driver");
306MODULE_LICENSE("GPL v2");