1 | // SPDX-License-Identifier: GPL-2.0 |
2 | /* |
3 | * LG.Philips LB035Q02 LCD Panel Driver |
4 | * |
5 | * Copyright (C) 2019 Texas Instruments Incorporated |
6 | * |
7 | * Based on the omapdrm-specific panel-lgphilips-lb035q02 driver |
8 | * |
9 | * Copyright (C) 2013 Texas Instruments Incorporated |
10 | * Author: Tomi Valkeinen <tomi.valkeinen@ti.com> |
11 | * |
12 | * Based on a driver by: Steve Sakoman <steve@sakoman.com> |
13 | */ |
14 | |
15 | #include <linux/gpio/consumer.h> |
16 | #include <linux/module.h> |
17 | #include <linux/spi/spi.h> |
18 | |
19 | #include <drm/drm_connector.h> |
20 | #include <drm/drm_modes.h> |
21 | #include <drm/drm_panel.h> |
22 | |
23 | struct lb035q02_device { |
24 | struct drm_panel panel; |
25 | |
26 | struct spi_device *spi; |
27 | struct gpio_desc *enable_gpio; |
28 | }; |
29 | |
30 | #define to_lb035q02_device(p) container_of(p, struct lb035q02_device, panel) |
31 | |
32 | static int lb035q02_write(struct lb035q02_device *lcd, u16 reg, u16 val) |
33 | { |
34 | struct spi_message msg; |
35 | struct spi_transfer index_xfer = { |
36 | .len = 3, |
37 | .cs_change = 1, |
38 | }; |
39 | struct spi_transfer value_xfer = { |
40 | .len = 3, |
41 | }; |
42 | u8 buffer[16]; |
43 | |
44 | spi_message_init(m: &msg); |
45 | |
46 | /* register index */ |
47 | buffer[0] = 0x70; |
48 | buffer[1] = 0x00; |
49 | buffer[2] = reg & 0x7f; |
50 | index_xfer.tx_buf = buffer; |
51 | spi_message_add_tail(t: &index_xfer, m: &msg); |
52 | |
53 | /* register value */ |
54 | buffer[4] = 0x72; |
55 | buffer[5] = val >> 8; |
56 | buffer[6] = val; |
57 | value_xfer.tx_buf = buffer + 4; |
58 | spi_message_add_tail(t: &value_xfer, m: &msg); |
59 | |
60 | return spi_sync(spi: lcd->spi, message: &msg); |
61 | } |
62 | |
63 | static int lb035q02_init(struct lb035q02_device *lcd) |
64 | { |
65 | /* Init sequence from page 28 of the lb035q02 spec. */ |
66 | static const struct { |
67 | u16 index; |
68 | u16 value; |
69 | } init_data[] = { |
70 | { 0x01, 0x6300 }, |
71 | { 0x02, 0x0200 }, |
72 | { 0x03, 0x0177 }, |
73 | { 0x04, 0x04c7 }, |
74 | { 0x05, 0xffc0 }, |
75 | { 0x06, 0xe806 }, |
76 | { 0x0a, 0x4008 }, |
77 | { 0x0b, 0x0000 }, |
78 | { 0x0d, 0x0030 }, |
79 | { 0x0e, 0x2800 }, |
80 | { 0x0f, 0x0000 }, |
81 | { 0x16, 0x9f80 }, |
82 | { 0x17, 0x0a0f }, |
83 | { 0x1e, 0x00c1 }, |
84 | { 0x30, 0x0300 }, |
85 | { 0x31, 0x0007 }, |
86 | { 0x32, 0x0000 }, |
87 | { 0x33, 0x0000 }, |
88 | { 0x34, 0x0707 }, |
89 | { 0x35, 0x0004 }, |
90 | { 0x36, 0x0302 }, |
91 | { 0x37, 0x0202 }, |
92 | { 0x3a, 0x0a0d }, |
93 | { 0x3b, 0x0806 }, |
94 | }; |
95 | |
96 | unsigned int i; |
97 | int ret; |
98 | |
99 | for (i = 0; i < ARRAY_SIZE(init_data); ++i) { |
100 | ret = lb035q02_write(lcd, reg: init_data[i].index, |
101 | val: init_data[i].value); |
102 | if (ret < 0) |
103 | return ret; |
104 | } |
105 | |
106 | return 0; |
107 | } |
108 | |
109 | static int lb035q02_disable(struct drm_panel *panel) |
110 | { |
111 | struct lb035q02_device *lcd = to_lb035q02_device(panel); |
112 | |
113 | gpiod_set_value_cansleep(desc: lcd->enable_gpio, value: 0); |
114 | |
115 | return 0; |
116 | } |
117 | |
118 | static int lb035q02_enable(struct drm_panel *panel) |
119 | { |
120 | struct lb035q02_device *lcd = to_lb035q02_device(panel); |
121 | |
122 | gpiod_set_value_cansleep(desc: lcd->enable_gpio, value: 1); |
123 | |
124 | return 0; |
125 | } |
126 | |
127 | static const struct drm_display_mode lb035q02_mode = { |
128 | .clock = 6500, |
129 | .hdisplay = 320, |
130 | .hsync_start = 320 + 20, |
131 | .hsync_end = 320 + 20 + 2, |
132 | .htotal = 320 + 20 + 2 + 68, |
133 | .vdisplay = 240, |
134 | .vsync_start = 240 + 4, |
135 | .vsync_end = 240 + 4 + 2, |
136 | .vtotal = 240 + 4 + 2 + 18, |
137 | .type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED, |
138 | .flags = DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC, |
139 | .width_mm = 70, |
140 | .height_mm = 53, |
141 | }; |
142 | |
143 | static int lb035q02_get_modes(struct drm_panel *panel, |
144 | struct drm_connector *connector) |
145 | { |
146 | struct drm_display_mode *mode; |
147 | |
148 | mode = drm_mode_duplicate(dev: connector->dev, mode: &lb035q02_mode); |
149 | if (!mode) |
150 | return -ENOMEM; |
151 | |
152 | drm_mode_set_name(mode); |
153 | drm_mode_probed_add(connector, mode); |
154 | |
155 | connector->display_info.width_mm = lb035q02_mode.width_mm; |
156 | connector->display_info.height_mm = lb035q02_mode.height_mm; |
157 | /* |
158 | * FIXME: According to the datasheet pixel data is sampled on the |
159 | * rising edge of the clock, but the code running on the Gumstix Overo |
160 | * Palo35 indicates sampling on the negative edge. This should be |
161 | * tested on a real device. |
162 | */ |
163 | connector->display_info.bus_flags = DRM_BUS_FLAG_DE_HIGH |
164 | | DRM_BUS_FLAG_SYNC_SAMPLE_POSEDGE |
165 | | DRM_BUS_FLAG_PIXDATA_SAMPLE_NEGEDGE; |
166 | |
167 | return 1; |
168 | } |
169 | |
170 | static const struct drm_panel_funcs lb035q02_funcs = { |
171 | .disable = lb035q02_disable, |
172 | .enable = lb035q02_enable, |
173 | .get_modes = lb035q02_get_modes, |
174 | }; |
175 | |
176 | static int lb035q02_probe(struct spi_device *spi) |
177 | { |
178 | struct lb035q02_device *lcd; |
179 | int ret; |
180 | |
181 | lcd = devm_kzalloc(dev: &spi->dev, size: sizeof(*lcd), GFP_KERNEL); |
182 | if (!lcd) |
183 | return -ENOMEM; |
184 | |
185 | spi_set_drvdata(spi, data: lcd); |
186 | lcd->spi = spi; |
187 | |
188 | lcd->enable_gpio = devm_gpiod_get(dev: &spi->dev, con_id: "enable" , flags: GPIOD_OUT_LOW); |
189 | if (IS_ERR(ptr: lcd->enable_gpio)) { |
190 | dev_err(&spi->dev, "failed to parse enable gpio\n" ); |
191 | return PTR_ERR(ptr: lcd->enable_gpio); |
192 | } |
193 | |
194 | ret = lb035q02_init(lcd); |
195 | if (ret < 0) |
196 | return ret; |
197 | |
198 | drm_panel_init(panel: &lcd->panel, dev: &lcd->spi->dev, funcs: &lb035q02_funcs, |
199 | DRM_MODE_CONNECTOR_DPI); |
200 | |
201 | drm_panel_add(panel: &lcd->panel); |
202 | |
203 | return 0; |
204 | } |
205 | |
206 | static void lb035q02_remove(struct spi_device *spi) |
207 | { |
208 | struct lb035q02_device *lcd = spi_get_drvdata(spi); |
209 | |
210 | drm_panel_remove(panel: &lcd->panel); |
211 | drm_panel_disable(panel: &lcd->panel); |
212 | } |
213 | |
214 | static const struct of_device_id lb035q02_of_match[] = { |
215 | { .compatible = "lgphilips,lb035q02" , }, |
216 | { /* sentinel */ }, |
217 | }; |
218 | |
219 | MODULE_DEVICE_TABLE(of, lb035q02_of_match); |
220 | |
221 | static const struct spi_device_id lb035q02_ids[] = { |
222 | { "lb035q02" , 0 }, |
223 | { /* sentinel */ } |
224 | }; |
225 | |
226 | MODULE_DEVICE_TABLE(spi, lb035q02_ids); |
227 | |
228 | static struct spi_driver lb035q02_driver = { |
229 | .probe = lb035q02_probe, |
230 | .remove = lb035q02_remove, |
231 | .id_table = lb035q02_ids, |
232 | .driver = { |
233 | .name = "panel-lg-lb035q02" , |
234 | .of_match_table = lb035q02_of_match, |
235 | }, |
236 | }; |
237 | |
238 | module_spi_driver(lb035q02_driver); |
239 | |
240 | MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@ti.com>" ); |
241 | MODULE_DESCRIPTION("LG.Philips LB035Q02 LCD Panel driver" ); |
242 | MODULE_LICENSE("GPL" ); |
243 | |