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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * DRM driver for Ilitek ILI9225 panels
4 *
5 * Copyright 2017 David Lechner <david@lechnology.com>
6 *
7 * Some code copied from mipi-dbi.c
8 * Copyright 2016 Noralf Trønnes
9 */
10
11#include <linux/delay.h>
12#include <linux/dma-buf.h>
13#include <linux/gpio/consumer.h>
14#include <linux/module.h>
15#include <linux/property.h>
16#include <linux/spi/spi.h>
17#include <video/mipi_display.h>
18
19#include <drm/drm_atomic_helper.h>
20#include <drm/drm_damage_helper.h>
21#include <drm/drm_drv.h>
22#include <drm/drm_fb_cma_helper.h>
23#include <drm/drm_fb_helper.h>
24#include <drm/drm_fourcc.h>
25#include <drm/drm_gem_cma_helper.h>
26#include <drm/drm_gem_framebuffer_helper.h>
27#include <drm/drm_managed.h>
28#include <drm/drm_mipi_dbi.h>
29#include <drm/drm_rect.h>
30
31#define ILI9225_DRIVER_READ_CODE 0x00
32#define ILI9225_DRIVER_OUTPUT_CONTROL 0x01
33#define ILI9225_LCD_AC_DRIVING_CONTROL 0x02
34#define ILI9225_ENTRY_MODE 0x03
35#define ILI9225_DISPLAY_CONTROL_1 0x07
36#define ILI9225_BLANK_PERIOD_CONTROL_1 0x08
37#define ILI9225_FRAME_CYCLE_CONTROL 0x0b
38#define ILI9225_INTERFACE_CONTROL 0x0c
39#define ILI9225_OSCILLATION_CONTROL 0x0f
40#define ILI9225_POWER_CONTROL_1 0x10
41#define ILI9225_POWER_CONTROL_2 0x11
42#define ILI9225_POWER_CONTROL_3 0x12
43#define ILI9225_POWER_CONTROL_4 0x13
44#define ILI9225_POWER_CONTROL_5 0x14
45#define ILI9225_VCI_RECYCLING 0x15
46#define ILI9225_RAM_ADDRESS_SET_1 0x20
47#define ILI9225_RAM_ADDRESS_SET_2 0x21
48#define ILI9225_WRITE_DATA_TO_GRAM 0x22
49#define ILI9225_SOFTWARE_RESET 0x28
50#define ILI9225_GATE_SCAN_CONTROL 0x30
51#define ILI9225_VERTICAL_SCROLL_1 0x31
52#define ILI9225_VERTICAL_SCROLL_2 0x32
53#define ILI9225_VERTICAL_SCROLL_3 0x33
54#define ILI9225_PARTIAL_DRIVING_POS_1 0x34
55#define ILI9225_PARTIAL_DRIVING_POS_2 0x35
56#define ILI9225_HORIZ_WINDOW_ADDR_1 0x36
57#define ILI9225_HORIZ_WINDOW_ADDR_2 0x37
58#define ILI9225_VERT_WINDOW_ADDR_1 0x38
59#define ILI9225_VERT_WINDOW_ADDR_2 0x39
60#define ILI9225_GAMMA_CONTROL_1 0x50
61#define ILI9225_GAMMA_CONTROL_2 0x51
62#define ILI9225_GAMMA_CONTROL_3 0x52
63#define ILI9225_GAMMA_CONTROL_4 0x53
64#define ILI9225_GAMMA_CONTROL_5 0x54
65#define ILI9225_GAMMA_CONTROL_6 0x55
66#define ILI9225_GAMMA_CONTROL_7 0x56
67#define ILI9225_GAMMA_CONTROL_8 0x57
68#define ILI9225_GAMMA_CONTROL_9 0x58
69#define ILI9225_GAMMA_CONTROL_10 0x59
70
71static inline int ili9225_command(struct mipi_dbi *dbi, u8 cmd, u16 data)
72{
73 u8 par[2] = { data >> 8, data & 0xff };
74
75 return mipi_dbi_command_buf(dbi, cmd, par, 2);
76}
77
78static void ili9225_fb_dirty(struct drm_framebuffer *fb, struct drm_rect *rect)
79{
80 struct drm_gem_cma_object *cma_obj = drm_fb_cma_get_gem_obj(fb, 0);
81 struct mipi_dbi_dev *dbidev = drm_to_mipi_dbi_dev(fb->dev);
82 unsigned int height = rect->y2 - rect->y1;
83 unsigned int width = rect->x2 - rect->x1;
84 struct mipi_dbi *dbi = &dbidev->dbi;
85 bool swap = dbi->swap_bytes;
86 u16 x_start, y_start;
87 u16 x1, x2, y1, y2;
88 int idx, ret = 0;
89 bool full;
90 void *tr;
91
92 if (!drm_dev_enter(fb->dev, &idx))
93 return;
94
95 full = width == fb->width && height == fb->height;
96
97 DRM_DEBUG_KMS("Flushing [FB:%d] " DRM_RECT_FMT "\n", fb->base.id, DRM_RECT_ARG(rect));
98
99 if (!dbi->dc || !full || swap ||
100 fb->format->format == DRM_FORMAT_XRGB8888) {
101 tr = dbidev->tx_buf;
102 ret = mipi_dbi_buf_copy(dbidev->tx_buf, fb, rect, swap);
103 if (ret)
104 goto err_msg;
105 } else {
106 tr = cma_obj->vaddr;
107 }
108
109 switch (dbidev->rotation) {
110 default:
111 x1 = rect->x1;
112 x2 = rect->x2 - 1;
113 y1 = rect->y1;
114 y2 = rect->y2 - 1;
115 x_start = x1;
116 y_start = y1;
117 break;
118 case 90:
119 x1 = rect->y1;
120 x2 = rect->y2 - 1;
121 y1 = fb->width - rect->x2;
122 y2 = fb->width - rect->x1 - 1;
123 x_start = x1;
124 y_start = y2;
125 break;
126 case 180:
127 x1 = fb->width - rect->x2;
128 x2 = fb->width - rect->x1 - 1;
129 y1 = fb->height - rect->y2;
130 y2 = fb->height - rect->y1 - 1;
131 x_start = x2;
132 y_start = y2;
133 break;
134 case 270:
135 x1 = fb->height - rect->y2;
136 x2 = fb->height - rect->y1 - 1;
137 y1 = rect->x1;
138 y2 = rect->x2 - 1;
139 x_start = x2;
140 y_start = y1;
141 break;
142 }
143
144 ili9225_command(dbi, ILI9225_HORIZ_WINDOW_ADDR_1, x2);
145 ili9225_command(dbi, ILI9225_HORIZ_WINDOW_ADDR_2, x1);
146 ili9225_command(dbi, ILI9225_VERT_WINDOW_ADDR_1, y2);
147 ili9225_command(dbi, ILI9225_VERT_WINDOW_ADDR_2, y1);
148
149 ili9225_command(dbi, ILI9225_RAM_ADDRESS_SET_1, x_start);
150 ili9225_command(dbi, ILI9225_RAM_ADDRESS_SET_2, y_start);
151
152 ret = mipi_dbi_command_buf(dbi, ILI9225_WRITE_DATA_TO_GRAM, tr,
153 width * height * 2);
154err_msg:
155 if (ret)
156 dev_err_once(fb->dev->dev, "Failed to update display %d\n", ret);
157
158 drm_dev_exit(idx);
159}
160
161static void ili9225_pipe_update(struct drm_simple_display_pipe *pipe,
162 struct drm_plane_state *old_state)
163{
164 struct drm_plane_state *state = pipe->plane.state;
165 struct drm_rect rect;
166
167 if (!pipe->crtc.state->active)
168 return;
169
170 if (drm_atomic_helper_damage_merged(old_state, state, &rect))
171 ili9225_fb_dirty(state->fb, &rect);
172}
173
174static void ili9225_pipe_enable(struct drm_simple_display_pipe *pipe,
175 struct drm_crtc_state *crtc_state,
176 struct drm_plane_state *plane_state)
177{
178 struct mipi_dbi_dev *dbidev = drm_to_mipi_dbi_dev(pipe->crtc.dev);
179 struct drm_framebuffer *fb = plane_state->fb;
180 struct device *dev = pipe->crtc.dev->dev;
181 struct mipi_dbi *dbi = &dbidev->dbi;
182 struct drm_rect rect = {
183 .x1 = 0,
184 .x2 = fb->width,
185 .y1 = 0,
186 .y2 = fb->height,
187 };
188 int ret, idx;
189 u8 am_id;
190
191 if (!drm_dev_enter(pipe->crtc.dev, &idx))
192 return;
193
194 DRM_DEBUG_KMS("\n");
195
196 mipi_dbi_hw_reset(dbi);
197
198 /*
199 * There don't seem to be two example init sequences that match, so
200 * using the one from the popular Arduino library for this display.
201 * https://github.com/Nkawu/TFT_22_ILI9225/blob/master/src/TFT_22_ILI9225.cpp
202 */
203
204 ret = ili9225_command(dbi, ILI9225_POWER_CONTROL_1, 0x0000);
205 if (ret) {
206 DRM_DEV_ERROR(dev, "Error sending command %d\n", ret);
207 goto out_exit;
208 }
209 ili9225_command(dbi, ILI9225_POWER_CONTROL_2, 0x0000);
210 ili9225_command(dbi, ILI9225_POWER_CONTROL_3, 0x0000);
211 ili9225_command(dbi, ILI9225_POWER_CONTROL_4, 0x0000);
212 ili9225_command(dbi, ILI9225_POWER_CONTROL_5, 0x0000);
213
214 msleep(40);
215
216 ili9225_command(dbi, ILI9225_POWER_CONTROL_2, 0x0018);
217 ili9225_command(dbi, ILI9225_POWER_CONTROL_3, 0x6121);
218 ili9225_command(dbi, ILI9225_POWER_CONTROL_4, 0x006f);
219 ili9225_command(dbi, ILI9225_POWER_CONTROL_5, 0x495f);
220 ili9225_command(dbi, ILI9225_POWER_CONTROL_1, 0x0800);
221
222 msleep(10);
223
224 ili9225_command(dbi, ILI9225_POWER_CONTROL_2, 0x103b);
225
226 msleep(50);
227
228 switch (dbidev->rotation) {
229 default:
230 am_id = 0x30;
231 break;
232 case 90:
233 am_id = 0x18;
234 break;
235 case 180:
236 am_id = 0x00;
237 break;
238 case 270:
239 am_id = 0x28;
240 break;
241 }
242 ili9225_command(dbi, ILI9225_DRIVER_OUTPUT_CONTROL, 0x011c);
243 ili9225_command(dbi, ILI9225_LCD_AC_DRIVING_CONTROL, 0x0100);
244 ili9225_command(dbi, ILI9225_ENTRY_MODE, 0x1000 | am_id);
245 ili9225_command(dbi, ILI9225_DISPLAY_CONTROL_1, 0x0000);
246 ili9225_command(dbi, ILI9225_BLANK_PERIOD_CONTROL_1, 0x0808);
247 ili9225_command(dbi, ILI9225_FRAME_CYCLE_CONTROL, 0x1100);
248 ili9225_command(dbi, ILI9225_INTERFACE_CONTROL, 0x0000);
249 ili9225_command(dbi, ILI9225_OSCILLATION_CONTROL, 0x0d01);
250 ili9225_command(dbi, ILI9225_VCI_RECYCLING, 0x0020);
251 ili9225_command(dbi, ILI9225_RAM_ADDRESS_SET_1, 0x0000);
252 ili9225_command(dbi, ILI9225_RAM_ADDRESS_SET_2, 0x0000);
253
254 ili9225_command(dbi, ILI9225_GATE_SCAN_CONTROL, 0x0000);
255 ili9225_command(dbi, ILI9225_VERTICAL_SCROLL_1, 0x00db);
256 ili9225_command(dbi, ILI9225_VERTICAL_SCROLL_2, 0x0000);
257 ili9225_command(dbi, ILI9225_VERTICAL_SCROLL_3, 0x0000);
258 ili9225_command(dbi, ILI9225_PARTIAL_DRIVING_POS_1, 0x00db);
259 ili9225_command(dbi, ILI9225_PARTIAL_DRIVING_POS_2, 0x0000);
260
261 ili9225_command(dbi, ILI9225_GAMMA_CONTROL_1, 0x0000);
262 ili9225_command(dbi, ILI9225_GAMMA_CONTROL_2, 0x0808);
263 ili9225_command(dbi, ILI9225_GAMMA_CONTROL_3, 0x080a);
264 ili9225_command(dbi, ILI9225_GAMMA_CONTROL_4, 0x000a);
265 ili9225_command(dbi, ILI9225_GAMMA_CONTROL_5, 0x0a08);
266 ili9225_command(dbi, ILI9225_GAMMA_CONTROL_6, 0x0808);
267 ili9225_command(dbi, ILI9225_GAMMA_CONTROL_7, 0x0000);
268 ili9225_command(dbi, ILI9225_GAMMA_CONTROL_8, 0x0a00);
269 ili9225_command(dbi, ILI9225_GAMMA_CONTROL_9, 0x0710);
270 ili9225_command(dbi, ILI9225_GAMMA_CONTROL_10, 0x0710);
271
272 ili9225_command(dbi, ILI9225_DISPLAY_CONTROL_1, 0x0012);
273
274 msleep(50);
275
276 ili9225_command(dbi, ILI9225_DISPLAY_CONTROL_1, 0x1017);
277
278 ili9225_fb_dirty(fb, &rect);
279out_exit:
280 drm_dev_exit(idx);
281}
282
283static void ili9225_pipe_disable(struct drm_simple_display_pipe *pipe)
284{
285 struct mipi_dbi_dev *dbidev = drm_to_mipi_dbi_dev(pipe->crtc.dev);
286 struct mipi_dbi *dbi = &dbidev->dbi;
287
288 DRM_DEBUG_KMS("\n");
289
290 /*
291 * This callback is not protected by drm_dev_enter/exit since we want to
292 * turn off the display on regular driver unload. It's highly unlikely
293 * that the underlying SPI controller is gone should this be called after
294 * unplug.
295 */
296
297 ili9225_command(dbi, ILI9225_DISPLAY_CONTROL_1, 0x0000);
298 msleep(50);
299 ili9225_command(dbi, ILI9225_POWER_CONTROL_2, 0x0007);
300 msleep(50);
301 ili9225_command(dbi, ILI9225_POWER_CONTROL_1, 0x0a02);
302}
303
304static int ili9225_dbi_command(struct mipi_dbi *dbi, u8 *cmd, u8 *par,
305 size_t num)
306{
307 struct spi_device *spi = dbi->spi;
308 unsigned int bpw = 8;
309 u32 speed_hz;
310 int ret;
311
312 gpiod_set_value_cansleep(dbi->dc, 0);
313 speed_hz = mipi_dbi_spi_cmd_max_speed(spi, 1);
314 ret = mipi_dbi_spi_transfer(spi, speed_hz, 8, cmd, 1);
315 if (ret || !num)
316 return ret;
317
318 if (*cmd == ILI9225_WRITE_DATA_TO_GRAM && !dbi->swap_bytes)
319 bpw = 16;
320
321 gpiod_set_value_cansleep(dbi->dc, 1);
322 speed_hz = mipi_dbi_spi_cmd_max_speed(spi, num);
323
324 return mipi_dbi_spi_transfer(spi, speed_hz, bpw, par, num);
325}
326
327static const struct drm_simple_display_pipe_funcs ili9225_pipe_funcs = {
328 .enable = ili9225_pipe_enable,
329 .disable = ili9225_pipe_disable,
330 .update = ili9225_pipe_update,
331 .prepare_fb = drm_gem_fb_simple_display_pipe_prepare_fb,
332};
333
334static const struct drm_display_mode ili9225_mode = {
335 DRM_SIMPLE_MODE(176, 220, 35, 44),
336};
337
338DEFINE_DRM_GEM_CMA_FOPS(ili9225_fops);
339
340static struct drm_driver ili9225_driver = {
341 .driver_features = DRIVER_GEM | DRIVER_MODESET | DRIVER_ATOMIC,
342 .fops = &ili9225_fops,
343 DRM_GEM_CMA_DRIVER_OPS_VMAP,
344 .name = "ili9225",
345 .desc = "Ilitek ILI9225",
346 .date = "20171106",
347 .major = 1,
348 .minor = 0,
349};
350
351static const struct of_device_id ili9225_of_match[] = {
352 { .compatible = "vot,v220hf01a-t" },
353 {},
354};
355MODULE_DEVICE_TABLE(of, ili9225_of_match);
356
357static const struct spi_device_id ili9225_id[] = {
358 { "v220hf01a-t", 0 },
359 { },
360};
361MODULE_DEVICE_TABLE(spi, ili9225_id);
362
363static int ili9225_probe(struct spi_device *spi)
364{
365 struct device *dev = &spi->dev;
366 struct mipi_dbi_dev *dbidev;
367 struct drm_device *drm;
368 struct mipi_dbi *dbi;
369 struct gpio_desc *rs;
370 u32 rotation = 0;
371 int ret;
372
373 dbidev = devm_drm_dev_alloc(dev, &ili9225_driver,
374 struct mipi_dbi_dev, drm);
375 if (IS_ERR(dbidev))
376 return PTR_ERR(dbidev);
377
378 dbi = &dbidev->dbi;
379 drm = &dbidev->drm;
380
381 dbi->reset = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
382 if (IS_ERR(dbi->reset)) {
383 DRM_DEV_ERROR(dev, "Failed to get gpio 'reset'\n");
384 return PTR_ERR(dbi->reset);
385 }
386
387 rs = devm_gpiod_get(dev, "rs", GPIOD_OUT_LOW);
388 if (IS_ERR(rs)) {
389 DRM_DEV_ERROR(dev, "Failed to get gpio 'rs'\n");
390 return PTR_ERR(rs);
391 }
392
393 device_property_read_u32(dev, "rotation", &rotation);
394
395 ret = mipi_dbi_spi_init(spi, dbi, rs);
396 if (ret)
397 return ret;
398
399 /* override the command function set in mipi_dbi_spi_init() */
400 dbi->command = ili9225_dbi_command;
401
402 ret = mipi_dbi_dev_init(dbidev, &ili9225_pipe_funcs, &ili9225_mode, rotation);
403 if (ret)
404 return ret;
405
406 drm_mode_config_reset(drm);
407
408 ret = drm_dev_register(drm, 0);
409 if (ret)
410 return ret;
411
412 spi_set_drvdata(spi, drm);
413
414 drm_fbdev_generic_setup(drm, 0);
415
416 return 0;
417}
418
419static int ili9225_remove(struct spi_device *spi)
420{
421 struct drm_device *drm = spi_get_drvdata(spi);
422
423 drm_dev_unplug(drm);
424 drm_atomic_helper_shutdown(drm);
425
426 return 0;
427}
428
429static void ili9225_shutdown(struct spi_device *spi)
430{
431 drm_atomic_helper_shutdown(spi_get_drvdata(spi));
432}
433
434static struct spi_driver ili9225_spi_driver = {
435 .driver = {
436 .name = "ili9225",
437 .owner = THIS_MODULE,
438 .of_match_table = ili9225_of_match,
439 },
440 .id_table = ili9225_id,
441 .probe = ili9225_probe,
442 .remove = ili9225_remove,
443 .shutdown = ili9225_shutdown,
444};
445module_spi_driver(ili9225_spi_driver);
446
447MODULE_DESCRIPTION("Ilitek ILI9225 DRM driver");
448MODULE_AUTHOR("David Lechner <david@lechnology.com>");
449MODULE_LICENSE("GPL");