1 // SPDX-License-Identifier: GPL-2.0+
2 
3 #include <linux/backlight.h>
4 #include <linux/delay.h>
5 #include <linux/gpio/consumer.h>
6 #include <linux/module.h>
7 #include <linux/property.h>
8 #include <linux/spi/spi.h>
9 
10 #include <drm/drm_atomic_helper.h>
11 #include <drm/drm_drv.h>
12 #include <drm/drm_fb_helper.h>
13 #include <drm/drm_gem_atomic_helper.h>
14 #include <drm/drm_gem_dma_helper.h>
15 #include <drm/drm_mipi_dbi.h>
16 #include <drm/drm_modeset_helper.h>
17 
18 #include <video/mipi_display.h>
19 
20 #define ILI9163_FRMCTR1		0xb1
21 
22 #define ILI9163_PWCTRL1		0xc0
23 #define ILI9163_PWCTRL2		0xc1
24 #define ILI9163_VMCTRL1		0xc5
25 #define ILI9163_VMCTRL2		0xc7
26 #define ILI9163_PWCTRLA		0xcb
27 #define ILI9163_PWCTRLB		0xcf
28 
29 #define ILI9163_EN3GAM		0xf2
30 
31 #define ILI9163_MADCTL_BGR	BIT(3)
32 #define ILI9163_MADCTL_MV	BIT(5)
33 #define ILI9163_MADCTL_MX	BIT(6)
34 #define ILI9163_MADCTL_MY	BIT(7)
35 
yx240qv29_enable(struct drm_simple_display_pipe * pipe,struct drm_crtc_state * crtc_state,struct drm_plane_state * plane_state)36 static void yx240qv29_enable(struct drm_simple_display_pipe *pipe,
37 			     struct drm_crtc_state *crtc_state,
38 			     struct drm_plane_state *plane_state)
39 {
40 	struct mipi_dbi_dev *dbidev = drm_to_mipi_dbi_dev(pipe->crtc.dev);
41 	struct mipi_dbi *dbi = &dbidev->dbi;
42 	u8 addr_mode;
43 	int ret, idx;
44 
45 	if (!drm_dev_enter(pipe->crtc.dev, &idx))
46 		return;
47 
48 	DRM_DEBUG_KMS("\n");
49 
50 	ret = mipi_dbi_poweron_conditional_reset(dbidev);
51 	if (ret < 0)
52 		goto out_exit;
53 	if (ret == 1)
54 		goto out_enable;
55 
56 	/* Gamma */
57 	mipi_dbi_command(dbi, MIPI_DCS_SET_GAMMA_CURVE, 0x04);
58 	mipi_dbi_command(dbi, ILI9163_EN3GAM, 0x00);
59 
60 	/* Frame Rate */
61 	mipi_dbi_command(dbi, ILI9163_FRMCTR1, 0x0a, 0x14);
62 
63 	/* Power Control */
64 	mipi_dbi_command(dbi, ILI9163_PWCTRL1, 0x0a, 0x00);
65 	mipi_dbi_command(dbi, ILI9163_PWCTRL2, 0x02);
66 
67 	/* VCOM */
68 	mipi_dbi_command(dbi, ILI9163_VMCTRL1, 0x2f, 0x3e);
69 	mipi_dbi_command(dbi, ILI9163_VMCTRL2, 0x40);
70 
71 	/* Memory Access Control */
72 	mipi_dbi_command(dbi, MIPI_DCS_SET_PIXEL_FORMAT, MIPI_DCS_PIXEL_FMT_16BIT);
73 
74 	mipi_dbi_command(dbi, MIPI_DCS_EXIT_SLEEP_MODE);
75 	msleep(100);
76 
77 	mipi_dbi_command(dbi, MIPI_DCS_SET_DISPLAY_ON);
78 	msleep(100);
79 
80 out_enable:
81 	switch (dbidev->rotation) {
82 	default:
83 		addr_mode = ILI9163_MADCTL_MX | ILI9163_MADCTL_MY;
84 		break;
85 	case 90:
86 		addr_mode = ILI9163_MADCTL_MX | ILI9163_MADCTL_MV;
87 		break;
88 	case 180:
89 		addr_mode = 0;
90 		break;
91 	case 270:
92 		addr_mode = ILI9163_MADCTL_MY | ILI9163_MADCTL_MV;
93 		break;
94 	}
95 	addr_mode |= ILI9163_MADCTL_BGR;
96 	mipi_dbi_command(dbi, MIPI_DCS_SET_ADDRESS_MODE, addr_mode);
97 	mipi_dbi_enable_flush(dbidev, crtc_state, plane_state);
98 out_exit:
99 	drm_dev_exit(idx);
100 }
101 
102 static const struct drm_simple_display_pipe_funcs ili9163_pipe_funcs = {
103 	.mode_valid = mipi_dbi_pipe_mode_valid,
104 	.enable = yx240qv29_enable,
105 	.disable = mipi_dbi_pipe_disable,
106 	.update = mipi_dbi_pipe_update,
107 	.prepare_fb = drm_gem_simple_display_pipe_prepare_fb,
108 };
109 
110 static const struct drm_display_mode yx240qv29_mode = {
111 	DRM_SIMPLE_MODE(128, 160, 28, 35),
112 };
113 
114 DEFINE_DRM_GEM_DMA_FOPS(ili9163_fops);
115 
116 static struct drm_driver ili9163_driver = {
117 	.driver_features	= DRIVER_GEM | DRIVER_MODESET | DRIVER_ATOMIC,
118 	.fops			= &ili9163_fops,
119 	DRM_GEM_DMA_DRIVER_OPS_VMAP,
120 	.debugfs_init		= mipi_dbi_debugfs_init,
121 	.name			= "ili9163",
122 	.desc			= "Ilitek ILI9163",
123 	.date			= "20210208",
124 	.major			= 1,
125 	.minor			= 0,
126 };
127 
128 static const struct of_device_id ili9163_of_match[] = {
129 	{ .compatible = "newhaven,1.8-128160EF" },
130 	{ }
131 };
132 MODULE_DEVICE_TABLE(of, ili9163_of_match);
133 
134 static const struct spi_device_id ili9163_id[] = {
135 	{ "nhd-1.8-128160EF", 0 },
136 	{ }
137 };
138 MODULE_DEVICE_TABLE(spi, ili9163_id);
139 
ili9163_probe(struct spi_device * spi)140 static int ili9163_probe(struct spi_device *spi)
141 {
142 	struct device *dev = &spi->dev;
143 	struct mipi_dbi_dev *dbidev;
144 	struct drm_device *drm;
145 	struct mipi_dbi *dbi;
146 	struct gpio_desc *dc;
147 	u32 rotation = 0;
148 	int ret;
149 
150 	dbidev = devm_drm_dev_alloc(dev, &ili9163_driver,
151 				    struct mipi_dbi_dev, drm);
152 	if (IS_ERR(dbidev))
153 		return PTR_ERR(dbidev);
154 
155 	dbi = &dbidev->dbi;
156 	drm = &dbidev->drm;
157 
158 	spi_set_drvdata(spi, drm);
159 
160 	dbi->reset = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_HIGH);
161 	if (IS_ERR(dbi->reset)) {
162 		DRM_DEV_ERROR(dev, "Failed to get gpio 'reset'\n");
163 		return PTR_ERR(dbi->reset);
164 	}
165 
166 	dc = devm_gpiod_get_optional(dev, "dc", GPIOD_OUT_LOW);
167 	if (IS_ERR(dc)) {
168 		DRM_DEV_ERROR(dev, "Failed to get gpio 'dc'\n");
169 		return PTR_ERR(dc);
170 	}
171 
172 	dbidev->backlight = devm_of_find_backlight(dev);
173 	if (IS_ERR(dbidev->backlight))
174 		return PTR_ERR(dbidev->backlight);
175 
176 	device_property_read_u32(dev, "rotation", &rotation);
177 
178 	ret = mipi_dbi_spi_init(spi, dbi, dc);
179 	if (ret)
180 		return ret;
181 
182 	ret = mipi_dbi_dev_init(dbidev, &ili9163_pipe_funcs, &yx240qv29_mode, rotation);
183 	if (ret)
184 		return ret;
185 
186 	drm_mode_config_reset(drm);
187 
188 	ret = drm_dev_register(drm, 0);
189 	if (ret)
190 		return ret;
191 
192 	drm_fbdev_generic_setup(drm, 0);
193 
194 	return 0;
195 }
196 
ili9163_remove(struct spi_device * spi)197 static void ili9163_remove(struct spi_device *spi)
198 {
199 	struct drm_device *drm = spi_get_drvdata(spi);
200 
201 	drm_dev_unplug(drm);
202 	drm_atomic_helper_shutdown(drm);
203 }
204 
ili9163_shutdown(struct spi_device * spi)205 static void ili9163_shutdown(struct spi_device *spi)
206 {
207 	drm_atomic_helper_shutdown(spi_get_drvdata(spi));
208 }
209 
210 static struct spi_driver ili9163_spi_driver = {
211 	.driver = {
212 		.name = "ili9163",
213 		.of_match_table = ili9163_of_match,
214 	},
215 	.id_table = ili9163_id,
216 	.probe = ili9163_probe,
217 	.remove = ili9163_remove,
218 	.shutdown = ili9163_shutdown,
219 };
220 module_spi_driver(ili9163_spi_driver);
221 
222 MODULE_DESCRIPTION("Ilitek ILI9163 DRM driver");
223 MODULE_AUTHOR("Daniel Mack <daniel@zonque.org>");
224 MODULE_LICENSE("GPL");
225