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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * DRM driver for Solomon SSD13xx OLED displays
4 *
5 * Copyright 2022 Red Hat Inc.
6 * Author: Javier Martinez Canillas <javierm@redhat.com>
7 *
8 * Based on drivers/video/fbdev/ssd1307fb.c
9 * Copyright 2012 Free Electrons
10 */
11
12#include <linux/backlight.h>
13#include <linux/bitfield.h>
14#include <linux/bits.h>
15#include <linux/delay.h>
16#include <linux/gpio/consumer.h>
17#include <linux/property.h>
18#include <linux/pwm.h>
19#include <linux/regulator/consumer.h>
20
21#include <drm/drm_atomic.h>
22#include <drm/drm_atomic_helper.h>
23#include <drm/drm_crtc_helper.h>
24#include <drm/drm_damage_helper.h>
25#include <drm/drm_edid.h>
26#include <drm/drm_fbdev_generic.h>
27#include <drm/drm_format_helper.h>
28#include <drm/drm_framebuffer.h>
29#include <drm/drm_gem_atomic_helper.h>
30#include <drm/drm_gem_framebuffer_helper.h>
31#include <drm/drm_gem_shmem_helper.h>
32#include <drm/drm_managed.h>
33#include <drm/drm_modes.h>
34#include <drm/drm_rect.h>
35#include <drm/drm_probe_helper.h>
36
37#include "ssd130x.h"
38
39#define DRIVER_NAME "ssd130x"
40#define DRIVER_DESC "DRM driver for Solomon SSD13xx OLED displays"
41#define DRIVER_DATE "20220131"
42#define DRIVER_MAJOR 1
43#define DRIVER_MINOR 0
44
45#define SSD130X_PAGE_HEIGHT 8
46
47#define SSD132X_SEGMENT_WIDTH 2
48
49/* ssd13xx commands */
50#define SSD13XX_CONTRAST 0x81
51#define SSD13XX_SET_SEG_REMAP 0xa0
52#define SSD13XX_SET_MULTIPLEX_RATIO 0xa8
53#define SSD13XX_DISPLAY_OFF 0xae
54#define SSD13XX_DISPLAY_ON 0xaf
55
56#define SSD13XX_SET_SEG_REMAP_MASK GENMASK(0, 0)
57#define SSD13XX_SET_SEG_REMAP_SET(val) FIELD_PREP(SSD13XX_SET_SEG_REMAP_MASK, (val))
58
59/* ssd130x commands */
60#define SSD130X_PAGE_COL_START_LOW 0x00
61#define SSD130X_PAGE_COL_START_HIGH 0x10
62#define SSD130X_SET_ADDRESS_MODE 0x20
63#define SSD130X_SET_COL_RANGE 0x21
64#define SSD130X_SET_PAGE_RANGE 0x22
65#define SSD130X_SET_LOOKUP_TABLE 0x91
66#define SSD130X_CHARGE_PUMP 0x8d
67#define SSD130X_START_PAGE_ADDRESS 0xb0
68#define SSD130X_SET_COM_SCAN_DIR 0xc0
69#define SSD130X_SET_DISPLAY_OFFSET 0xd3
70#define SSD130X_SET_CLOCK_FREQ 0xd5
71#define SSD130X_SET_AREA_COLOR_MODE 0xd8
72#define SSD130X_SET_PRECHARGE_PERIOD 0xd9
73#define SSD130X_SET_COM_PINS_CONFIG 0xda
74#define SSD130X_SET_VCOMH 0xdb
75
76/* ssd130x commands accessors */
77#define SSD130X_PAGE_COL_START_MASK GENMASK(3, 0)
78#define SSD130X_PAGE_COL_START_HIGH_SET(val) FIELD_PREP(SSD130X_PAGE_COL_START_MASK, (val) >> 4)
79#define SSD130X_PAGE_COL_START_LOW_SET(val) FIELD_PREP(SSD130X_PAGE_COL_START_MASK, (val))
80#define SSD130X_START_PAGE_ADDRESS_MASK GENMASK(2, 0)
81#define SSD130X_START_PAGE_ADDRESS_SET(val) FIELD_PREP(SSD130X_START_PAGE_ADDRESS_MASK, (val))
82#define SSD130X_SET_COM_SCAN_DIR_MASK GENMASK(3, 3)
83#define SSD130X_SET_COM_SCAN_DIR_SET(val) FIELD_PREP(SSD130X_SET_COM_SCAN_DIR_MASK, (val))
84#define SSD130X_SET_CLOCK_DIV_MASK GENMASK(3, 0)
85#define SSD130X_SET_CLOCK_DIV_SET(val) FIELD_PREP(SSD130X_SET_CLOCK_DIV_MASK, (val))
86#define SSD130X_SET_CLOCK_FREQ_MASK GENMASK(7, 4)
87#define SSD130X_SET_CLOCK_FREQ_SET(val) FIELD_PREP(SSD130X_SET_CLOCK_FREQ_MASK, (val))
88#define SSD130X_SET_PRECHARGE_PERIOD1_MASK GENMASK(3, 0)
89#define SSD130X_SET_PRECHARGE_PERIOD1_SET(val) FIELD_PREP(SSD130X_SET_PRECHARGE_PERIOD1_MASK, (val))
90#define SSD130X_SET_PRECHARGE_PERIOD2_MASK GENMASK(7, 4)
91#define SSD130X_SET_PRECHARGE_PERIOD2_SET(val) FIELD_PREP(SSD130X_SET_PRECHARGE_PERIOD2_MASK, (val))
92#define SSD130X_SET_COM_PINS_CONFIG1_MASK GENMASK(4, 4)
93#define SSD130X_SET_COM_PINS_CONFIG1_SET(val) FIELD_PREP(SSD130X_SET_COM_PINS_CONFIG1_MASK, (val))
94#define SSD130X_SET_COM_PINS_CONFIG2_MASK GENMASK(5, 5)
95#define SSD130X_SET_COM_PINS_CONFIG2_SET(val) FIELD_PREP(SSD130X_SET_COM_PINS_CONFIG2_MASK, (val))
96
97#define SSD130X_SET_ADDRESS_MODE_HORIZONTAL 0x00
98#define SSD130X_SET_ADDRESS_MODE_VERTICAL 0x01
99#define SSD130X_SET_ADDRESS_MODE_PAGE 0x02
100
101#define SSD130X_SET_AREA_COLOR_MODE_ENABLE 0x1e
102#define SSD130X_SET_AREA_COLOR_MODE_LOW_POWER 0x05
103
104/* ssd132x commands */
105#define SSD132X_SET_COL_RANGE 0x15
106#define SSD132X_SET_DEACTIVATE_SCROLL 0x2e
107#define SSD132X_SET_ROW_RANGE 0x75
108#define SSD132X_SET_DISPLAY_START 0xa1
109#define SSD132X_SET_DISPLAY_OFFSET 0xa2
110#define SSD132X_SET_DISPLAY_NORMAL 0xa4
111#define SSD132X_SET_FUNCTION_SELECT_A 0xab
112#define SSD132X_SET_PHASE_LENGTH 0xb1
113#define SSD132X_SET_CLOCK_FREQ 0xb3
114#define SSD132X_SET_GPIO 0xb5
115#define SSD132X_SET_PRECHARGE_PERIOD 0xb6
116#define SSD132X_SET_GRAY_SCALE_TABLE 0xb8
117#define SSD132X_SELECT_DEFAULT_TABLE 0xb9
118#define SSD132X_SET_PRECHARGE_VOLTAGE 0xbc
119#define SSD130X_SET_VCOMH_VOLTAGE 0xbe
120#define SSD132X_SET_FUNCTION_SELECT_B 0xd5
121
122/* ssd133x commands */
123#define SSD133X_SET_COL_RANGE 0x15
124#define SSD133X_SET_ROW_RANGE 0x75
125#define SSD133X_CONTRAST_A 0x81
126#define SSD133X_CONTRAST_B 0x82
127#define SSD133X_CONTRAST_C 0x83
128#define SSD133X_SET_MASTER_CURRENT 0x87
129#define SSD132X_SET_PRECHARGE_A 0x8a
130#define SSD132X_SET_PRECHARGE_B 0x8b
131#define SSD132X_SET_PRECHARGE_C 0x8c
132#define SSD133X_SET_DISPLAY_START 0xa1
133#define SSD133X_SET_DISPLAY_OFFSET 0xa2
134#define SSD133X_SET_DISPLAY_NORMAL 0xa4
135#define SSD133X_SET_MASTER_CONFIG 0xad
136#define SSD133X_POWER_SAVE_MODE 0xb0
137#define SSD133X_PHASES_PERIOD 0xb1
138#define SSD133X_SET_CLOCK_FREQ 0xb3
139#define SSD133X_SET_PRECHARGE_VOLTAGE 0xbb
140#define SSD133X_SET_VCOMH_VOLTAGE 0xbe
141
142#define MAX_CONTRAST 255
143
144const struct ssd130x_deviceinfo ssd130x_variants[] = {
145 [SH1106_ID] = {
146 .default_vcomh = 0x40,
147 .default_dclk_div = 1,
148 .default_dclk_frq = 5,
149 .default_width = 132,
150 .default_height = 64,
151 .page_mode_only = 1,
152 .family_id = SSD130X_FAMILY,
153 },
154 [SSD1305_ID] = {
155 .default_vcomh = 0x34,
156 .default_dclk_div = 1,
157 .default_dclk_frq = 7,
158 .default_width = 132,
159 .default_height = 64,
160 .family_id = SSD130X_FAMILY,
161 },
162 [SSD1306_ID] = {
163 .default_vcomh = 0x20,
164 .default_dclk_div = 1,
165 .default_dclk_frq = 8,
166 .need_chargepump = 1,
167 .default_width = 128,
168 .default_height = 64,
169 .family_id = SSD130X_FAMILY,
170 },
171 [SSD1307_ID] = {
172 .default_vcomh = 0x20,
173 .default_dclk_div = 2,
174 .default_dclk_frq = 12,
175 .need_pwm = 1,
176 .default_width = 128,
177 .default_height = 39,
178 .family_id = SSD130X_FAMILY,
179 },
180 [SSD1309_ID] = {
181 .default_vcomh = 0x34,
182 .default_dclk_div = 1,
183 .default_dclk_frq = 10,
184 .default_width = 128,
185 .default_height = 64,
186 .family_id = SSD130X_FAMILY,
187 },
188 /* ssd132x family */
189 [SSD1322_ID] = {
190 .default_width = 480,
191 .default_height = 128,
192 .family_id = SSD132X_FAMILY,
193 },
194 [SSD1325_ID] = {
195 .default_width = 128,
196 .default_height = 80,
197 .family_id = SSD132X_FAMILY,
198 },
199 [SSD1327_ID] = {
200 .default_width = 128,
201 .default_height = 128,
202 .family_id = SSD132X_FAMILY,
203 },
204 /* ssd133x family */
205 [SSD1331_ID] = {
206 .default_width = 96,
207 .default_height = 64,
208 .family_id = SSD133X_FAMILY,
209 }
210};
211EXPORT_SYMBOL_NS_GPL(ssd130x_variants, DRM_SSD130X);
212
213struct ssd130x_crtc_state {
214 struct drm_crtc_state base;
215 /* Buffer to store pixels in HW format and written to the panel */
216 u8 *data_array;
217};
218
219struct ssd130x_plane_state {
220 struct drm_shadow_plane_state base;
221 /* Intermediate buffer to convert pixels from XRGB8888 to HW format */
222 u8 *buffer;
223};
224
225static inline struct ssd130x_crtc_state *to_ssd130x_crtc_state(struct drm_crtc_state *state)
226{
227 return container_of(state, struct ssd130x_crtc_state, base);
228}
229
230static inline struct ssd130x_plane_state *to_ssd130x_plane_state(struct drm_plane_state *state)
231{
232 return container_of(state, struct ssd130x_plane_state, base.base);
233}
234
235static inline struct ssd130x_device *drm_to_ssd130x(struct drm_device *drm)
236{
237 return container_of(drm, struct ssd130x_device, drm);
238}
239
240/*
241 * Helper to write data (SSD13XX_DATA) to the device.
242 */
243static int ssd130x_write_data(struct ssd130x_device *ssd130x, u8 *values, int count)
244{
245 return regmap_bulk_write(ssd130x->regmap, SSD13XX_DATA, values, count);
246}
247
248/*
249 * Helper to write command (SSD13XX_COMMAND). The fist variadic argument
250 * is the command to write and the following are the command options.
251 *
252 * Note that the ssd13xx protocol requires each command and option to be
253 * written as a SSD13XX_COMMAND device register value. That is why a call
254 * to regmap_write(..., SSD13XX_COMMAND, ...) is done for each argument.
255 */
256static int ssd130x_write_cmd(struct ssd130x_device *ssd130x, int count,
257 /* u8 cmd, u8 option, ... */...)
258{
259 va_list ap;
260 u8 value;
261 int ret;
262
263 va_start(ap, count);
264
265 do {
266 value = va_arg(ap, int);
267 ret = regmap_write(ssd130x->regmap, SSD13XX_COMMAND, value);
268 if (ret)
269 goto out_end;
270 } while (--count);
271
272out_end:
273 va_end(ap);
274
275 return ret;
276}
277
278/* Set address range for horizontal/vertical addressing modes */
279static int ssd130x_set_col_range(struct ssd130x_device *ssd130x,
280 u8 col_start, u8 cols)
281{
282 u8 col_end = col_start + cols - 1;
283 int ret;
284
285 if (col_start == ssd130x->col_start && col_end == ssd130x->col_end)
286 return 0;
287
288 ret = ssd130x_write_cmd(ssd130x, 3, SSD130X_SET_COL_RANGE, col_start, col_end);
289 if (ret < 0)
290 return ret;
291
292 ssd130x->col_start = col_start;
293 ssd130x->col_end = col_end;
294 return 0;
295}
296
297static int ssd130x_set_page_range(struct ssd130x_device *ssd130x,
298 u8 page_start, u8 pages)
299{
300 u8 page_end = page_start + pages - 1;
301 int ret;
302
303 if (page_start == ssd130x->page_start && page_end == ssd130x->page_end)
304 return 0;
305
306 ret = ssd130x_write_cmd(ssd130x, 3, SSD130X_SET_PAGE_RANGE, page_start, page_end);
307 if (ret < 0)
308 return ret;
309
310 ssd130x->page_start = page_start;
311 ssd130x->page_end = page_end;
312 return 0;
313}
314
315/* Set page and column start address for page addressing mode */
316static int ssd130x_set_page_pos(struct ssd130x_device *ssd130x,
317 u8 page_start, u8 col_start)
318{
319 int ret;
320 u32 page, col_low, col_high;
321
322 page = SSD130X_START_PAGE_ADDRESS |
323 SSD130X_START_PAGE_ADDRESS_SET(page_start);
324 col_low = SSD130X_PAGE_COL_START_LOW |
325 SSD130X_PAGE_COL_START_LOW_SET(col_start);
326 col_high = SSD130X_PAGE_COL_START_HIGH |
327 SSD130X_PAGE_COL_START_HIGH_SET(col_start);
328 ret = ssd130x_write_cmd(ssd130x, 3, page, col_low, col_high);
329 if (ret < 0)
330 return ret;
331
332 return 0;
333}
334
335static int ssd130x_pwm_enable(struct ssd130x_device *ssd130x)
336{
337 struct device *dev = ssd130x->dev;
338 struct pwm_state pwmstate;
339
340 ssd130x->pwm = pwm_get(dev, NULL);
341 if (IS_ERR(ssd130x->pwm)) {
342 dev_err(dev, "Could not get PWM from firmware description!\n");
343 return PTR_ERR(ssd130x->pwm);
344 }
345
346 pwm_init_state(ssd130x->pwm, &pwmstate);
347 pwm_set_relative_duty_cycle(&pwmstate, 50, 100);
348 pwm_apply_might_sleep(ssd130x->pwm, &pwmstate);
349
350 /* Enable the PWM */
351 pwm_enable(ssd130x->pwm);
352
353 dev_dbg(dev, "Using PWM %s with a %lluns period.\n",
354 ssd130x->pwm->label, pwm_get_period(ssd130x->pwm));
355
356 return 0;
357}
358
359static void ssd130x_reset(struct ssd130x_device *ssd130x)
360{
361 if (!ssd130x->reset)
362 return;
363
364 /* Reset the screen */
365 gpiod_set_value_cansleep(ssd130x->reset, 1);
366 udelay(4);
367 gpiod_set_value_cansleep(ssd130x->reset, 0);
368 udelay(4);
369}
370
371static int ssd130x_power_on(struct ssd130x_device *ssd130x)
372{
373 struct device *dev = ssd130x->dev;
374 int ret;
375
376 ssd130x_reset(ssd130x);
377
378 ret = regulator_enable(ssd130x->vcc_reg);
379 if (ret) {
380 dev_err(dev, "Failed to enable VCC: %d\n", ret);
381 return ret;
382 }
383
384 if (ssd130x->device_info->need_pwm) {
385 ret = ssd130x_pwm_enable(ssd130x);
386 if (ret) {
387 dev_err(dev, "Failed to enable PWM: %d\n", ret);
388 regulator_disable(ssd130x->vcc_reg);
389 return ret;
390 }
391 }
392
393 return 0;
394}
395
396static void ssd130x_power_off(struct ssd130x_device *ssd130x)
397{
398 pwm_disable(ssd130x->pwm);
399 pwm_put(ssd130x->pwm);
400
401 regulator_disable(ssd130x->vcc_reg);
402}
403
404static int ssd130x_init(struct ssd130x_device *ssd130x)
405{
406 u32 precharge, dclk, com_invdir, compins, chargepump, seg_remap;
407 bool scan_mode;
408 int ret;
409
410 /* Set initial contrast */
411 ret = ssd130x_write_cmd(ssd130x, 2, SSD13XX_CONTRAST, ssd130x->contrast);
412 if (ret < 0)
413 return ret;
414
415 /* Set segment re-map */
416 seg_remap = (SSD13XX_SET_SEG_REMAP |
417 SSD13XX_SET_SEG_REMAP_SET(ssd130x->seg_remap));
418 ret = ssd130x_write_cmd(ssd130x, 1, seg_remap);
419 if (ret < 0)
420 return ret;
421
422 /* Set COM direction */
423 com_invdir = (SSD130X_SET_COM_SCAN_DIR |
424 SSD130X_SET_COM_SCAN_DIR_SET(ssd130x->com_invdir));
425 ret = ssd130x_write_cmd(ssd130x, 1, com_invdir);
426 if (ret < 0)
427 return ret;
428
429 /* Set multiplex ratio value */
430 ret = ssd130x_write_cmd(ssd130x, 2, SSD13XX_SET_MULTIPLEX_RATIO, ssd130x->height - 1);
431 if (ret < 0)
432 return ret;
433
434 /* set display offset value */
435 ret = ssd130x_write_cmd(ssd130x, 2, SSD130X_SET_DISPLAY_OFFSET, ssd130x->com_offset);
436 if (ret < 0)
437 return ret;
438
439 /* Set clock frequency */
440 dclk = (SSD130X_SET_CLOCK_DIV_SET(ssd130x->dclk_div - 1) |
441 SSD130X_SET_CLOCK_FREQ_SET(ssd130x->dclk_frq));
442 ret = ssd130x_write_cmd(ssd130x, 2, SSD130X_SET_CLOCK_FREQ, dclk);
443 if (ret < 0)
444 return ret;
445
446 /* Set Area Color Mode ON/OFF & Low Power Display Mode */
447 if (ssd130x->area_color_enable || ssd130x->low_power) {
448 u32 mode = 0;
449
450 if (ssd130x->area_color_enable)
451 mode |= SSD130X_SET_AREA_COLOR_MODE_ENABLE;
452
453 if (ssd130x->low_power)
454 mode |= SSD130X_SET_AREA_COLOR_MODE_LOW_POWER;
455
456 ret = ssd130x_write_cmd(ssd130x, 2, SSD130X_SET_AREA_COLOR_MODE, mode);
457 if (ret < 0)
458 return ret;
459 }
460
461 /* Set precharge period in number of ticks from the internal clock */
462 precharge = (SSD130X_SET_PRECHARGE_PERIOD1_SET(ssd130x->prechargep1) |
463 SSD130X_SET_PRECHARGE_PERIOD2_SET(ssd130x->prechargep2));
464 ret = ssd130x_write_cmd(ssd130x, 2, SSD130X_SET_PRECHARGE_PERIOD, precharge);
465 if (ret < 0)
466 return ret;
467
468 /* Set COM pins configuration */
469 compins = BIT(1);
470 /*
471 * The COM scan mode field values are the inverse of the boolean DT
472 * property "solomon,com-seq". The value 0b means scan from COM0 to
473 * COM[N - 1] while 1b means scan from COM[N - 1] to COM0.
474 */
475 scan_mode = !ssd130x->com_seq;
476 compins |= (SSD130X_SET_COM_PINS_CONFIG1_SET(scan_mode) |
477 SSD130X_SET_COM_PINS_CONFIG2_SET(ssd130x->com_lrremap));
478 ret = ssd130x_write_cmd(ssd130x, 2, SSD130X_SET_COM_PINS_CONFIG, compins);
479 if (ret < 0)
480 return ret;
481
482 /* Set VCOMH */
483 ret = ssd130x_write_cmd(ssd130x, 2, SSD130X_SET_VCOMH, ssd130x->vcomh);
484 if (ret < 0)
485 return ret;
486
487 /* Turn on the DC-DC Charge Pump */
488 chargepump = BIT(4);
489
490 if (ssd130x->device_info->need_chargepump)
491 chargepump |= BIT(2);
492
493 ret = ssd130x_write_cmd(ssd130x, 2, SSD130X_CHARGE_PUMP, chargepump);
494 if (ret < 0)
495 return ret;
496
497 /* Set lookup table */
498 if (ssd130x->lookup_table_set) {
499 int i;
500
501 ret = ssd130x_write_cmd(ssd130x, 1, SSD130X_SET_LOOKUP_TABLE);
502 if (ret < 0)
503 return ret;
504
505 for (i = 0; i < ARRAY_SIZE(ssd130x->lookup_table); i++) {
506 u8 val = ssd130x->lookup_table[i];
507
508 if (val < 31 || val > 63)
509 dev_warn(ssd130x->dev,
510 "lookup table index %d value out of range 31 <= %d <= 63\n",
511 i, val);
512 ret = ssd130x_write_cmd(ssd130x, 1, val);
513 if (ret < 0)
514 return ret;
515 }
516 }
517
518 /* Switch to page addressing mode */
519 if (ssd130x->page_address_mode)
520 return ssd130x_write_cmd(ssd130x, 2, SSD130X_SET_ADDRESS_MODE,
521 SSD130X_SET_ADDRESS_MODE_PAGE);
522
523 /* Switch to horizontal addressing mode */
524 return ssd130x_write_cmd(ssd130x, 2, SSD130X_SET_ADDRESS_MODE,
525 SSD130X_SET_ADDRESS_MODE_HORIZONTAL);
526}
527
528static int ssd132x_init(struct ssd130x_device *ssd130x)
529{
530 int ret;
531
532 /* Set initial contrast */
533 ret = ssd130x_write_cmd(ssd130x, 2, SSD13XX_CONTRAST, 0x80);
534 if (ret < 0)
535 return ret;
536
537 /* Set column start and end */
538 ret = ssd130x_write_cmd(ssd130x, 3, SSD132X_SET_COL_RANGE, 0x00,
539 ssd130x->width / SSD132X_SEGMENT_WIDTH - 1);
540 if (ret < 0)
541 return ret;
542
543 /* Set row start and end */
544 ret = ssd130x_write_cmd(ssd130x, 3, SSD132X_SET_ROW_RANGE, 0x00, ssd130x->height - 1);
545 if (ret < 0)
546 return ret;
547 /*
548 * Horizontal Address Increment
549 * Re-map for Column Address, Nibble and COM
550 * COM Split Odd Even
551 */
552 ret = ssd130x_write_cmd(ssd130x, 2, SSD13XX_SET_SEG_REMAP, 0x53);
553 if (ret < 0)
554 return ret;
555
556 /* Set display start and offset */
557 ret = ssd130x_write_cmd(ssd130x, 2, SSD132X_SET_DISPLAY_START, 0x00);
558 if (ret < 0)
559 return ret;
560
561 ret = ssd130x_write_cmd(ssd130x, 2, SSD132X_SET_DISPLAY_OFFSET, 0x00);
562 if (ret < 0)
563 return ret;
564
565 /* Set display mode normal */
566 ret = ssd130x_write_cmd(ssd130x, 1, SSD132X_SET_DISPLAY_NORMAL);
567 if (ret < 0)
568 return ret;
569
570 /* Set multiplex ratio value */
571 ret = ssd130x_write_cmd(ssd130x, 2, SSD13XX_SET_MULTIPLEX_RATIO, ssd130x->height - 1);
572 if (ret < 0)
573 return ret;
574
575 /* Set phase length */
576 ret = ssd130x_write_cmd(ssd130x, 2, SSD132X_SET_PHASE_LENGTH, 0x55);
577 if (ret < 0)
578 return ret;
579
580 /* Select default linear gray scale table */
581 ret = ssd130x_write_cmd(ssd130x, 1, SSD132X_SELECT_DEFAULT_TABLE);
582 if (ret < 0)
583 return ret;
584
585 /* Set clock frequency */
586 ret = ssd130x_write_cmd(ssd130x, 2, SSD132X_SET_CLOCK_FREQ, 0x01);
587 if (ret < 0)
588 return ret;
589
590 /* Enable internal VDD regulator */
591 ret = ssd130x_write_cmd(ssd130x, 2, SSD132X_SET_FUNCTION_SELECT_A, 0x1);
592 if (ret < 0)
593 return ret;
594
595 /* Set pre-charge period */
596 ret = ssd130x_write_cmd(ssd130x, 2, SSD132X_SET_PRECHARGE_PERIOD, 0x01);
597 if (ret < 0)
598 return ret;
599
600 /* Set pre-charge voltage */
601 ret = ssd130x_write_cmd(ssd130x, 2, SSD132X_SET_PRECHARGE_VOLTAGE, 0x08);
602 if (ret < 0)
603 return ret;
604
605 /* Set VCOMH voltage */
606 ret = ssd130x_write_cmd(ssd130x, 2, SSD130X_SET_VCOMH_VOLTAGE, 0x07);
607 if (ret < 0)
608 return ret;
609
610 /* Enable second pre-charge and internal VSL */
611 ret = ssd130x_write_cmd(ssd130x, 2, SSD132X_SET_FUNCTION_SELECT_B, 0x62);
612 if (ret < 0)
613 return ret;
614
615 return 0;
616}
617
618static int ssd133x_init(struct ssd130x_device *ssd130x)
619{
620 int ret;
621
622 /* Set color A contrast */
623 ret = ssd130x_write_cmd(ssd130x, 2, SSD133X_CONTRAST_A, 0x91);
624 if (ret < 0)
625 return ret;
626
627 /* Set color B contrast */
628 ret = ssd130x_write_cmd(ssd130x, 2, SSD133X_CONTRAST_B, 0x50);
629 if (ret < 0)
630 return ret;
631
632 /* Set color C contrast */
633 ret = ssd130x_write_cmd(ssd130x, 2, SSD133X_CONTRAST_C, 0x7d);
634 if (ret < 0)
635 return ret;
636
637 /* Set master current */
638 ret = ssd130x_write_cmd(ssd130x, 2, SSD133X_SET_MASTER_CURRENT, 0x06);
639 if (ret < 0)
640 return ret;
641
642 /* Set column start and end */
643 ret = ssd130x_write_cmd(ssd130x, 3, SSD133X_SET_COL_RANGE, 0x00, ssd130x->width - 1);
644 if (ret < 0)
645 return ret;
646
647 /* Set row start and end */
648 ret = ssd130x_write_cmd(ssd130x, 3, SSD133X_SET_ROW_RANGE, 0x00, ssd130x->height - 1);
649 if (ret < 0)
650 return ret;
651
652 /*
653 * Horizontal Address Increment
654 * Normal order SA,SB,SC (e.g. RGB)
655 * COM Split Odd Even
656 * 256 color format
657 */
658 ret = ssd130x_write_cmd(ssd130x, 2, SSD13XX_SET_SEG_REMAP, 0x20);
659 if (ret < 0)
660 return ret;
661
662 /* Set display start and offset */
663 ret = ssd130x_write_cmd(ssd130x, 2, SSD133X_SET_DISPLAY_START, 0x00);
664 if (ret < 0)
665 return ret;
666
667 ret = ssd130x_write_cmd(ssd130x, 2, SSD133X_SET_DISPLAY_OFFSET, 0x00);
668 if (ret < 0)
669 return ret;
670
671 /* Set display mode normal */
672 ret = ssd130x_write_cmd(ssd130x, 1, SSD133X_SET_DISPLAY_NORMAL);
673 if (ret < 0)
674 return ret;
675
676 /* Set multiplex ratio value */
677 ret = ssd130x_write_cmd(ssd130x, 2, SSD13XX_SET_MULTIPLEX_RATIO, ssd130x->height - 1);
678 if (ret < 0)
679 return ret;
680
681 /* Set master configuration */
682 ret = ssd130x_write_cmd(ssd130x, 2, SSD133X_SET_MASTER_CONFIG, 0x8e);
683 if (ret < 0)
684 return ret;
685
686 /* Set power mode */
687 ret = ssd130x_write_cmd(ssd130x, 2, SSD133X_POWER_SAVE_MODE, 0x0b);
688 if (ret < 0)
689 return ret;
690
691 /* Set Phase 1 and 2 period */
692 ret = ssd130x_write_cmd(ssd130x, 2, SSD133X_PHASES_PERIOD, 0x31);
693 if (ret < 0)
694 return ret;
695
696 /* Set clock divider */
697 ret = ssd130x_write_cmd(ssd130x, 2, SSD133X_SET_CLOCK_FREQ, 0xf0);
698 if (ret < 0)
699 return ret;
700
701 /* Set pre-charge A */
702 ret = ssd130x_write_cmd(ssd130x, 2, SSD132X_SET_PRECHARGE_A, 0x64);
703 if (ret < 0)
704 return ret;
705
706 /* Set pre-charge B */
707 ret = ssd130x_write_cmd(ssd130x, 2, SSD132X_SET_PRECHARGE_B, 0x78);
708 if (ret < 0)
709 return ret;
710
711 /* Set pre-charge C */
712 ret = ssd130x_write_cmd(ssd130x, 2, SSD132X_SET_PRECHARGE_C, 0x64);
713 if (ret < 0)
714 return ret;
715
716 /* Set pre-charge level */
717 ret = ssd130x_write_cmd(ssd130x, 2, SSD133X_SET_PRECHARGE_VOLTAGE, 0x3a);
718 if (ret < 0)
719 return ret;
720
721 /* Set VCOMH voltage */
722 ret = ssd130x_write_cmd(ssd130x, 2, SSD133X_SET_VCOMH_VOLTAGE, 0x3e);
723 if (ret < 0)
724 return ret;
725
726 return 0;
727}
728
729static int ssd130x_update_rect(struct ssd130x_device *ssd130x,
730 struct drm_rect *rect, u8 *buf,
731 u8 *data_array)
732{
733 unsigned int x = rect->x1;
734 unsigned int y = rect->y1;
735 unsigned int width = drm_rect_width(rect);
736 unsigned int height = drm_rect_height(rect);
737 unsigned int line_length = DIV_ROUND_UP(width, 8);
738 unsigned int page_height = SSD130X_PAGE_HEIGHT;
739 unsigned int pages = DIV_ROUND_UP(height, page_height);
740 struct drm_device *drm = &ssd130x->drm;
741 u32 array_idx = 0;
742 int ret, i, j, k;
743
744 drm_WARN_ONCE(drm, y % page_height != 0, "y must be aligned to screen page\n");
745
746 /*
747 * The screen is divided in pages, each having a height of 8
748 * pixels, and the width of the screen. When sending a byte of
749 * data to the controller, it gives the 8 bits for the current
750 * column. I.e, the first byte are the 8 bits of the first
751 * column, then the 8 bits for the second column, etc.
752 *
753 *
754 * Representation of the screen, assuming it is 5 bits
755 * wide. Each letter-number combination is a bit that controls
756 * one pixel.
757 *
758 * A0 A1 A2 A3 A4
759 * B0 B1 B2 B3 B4
760 * C0 C1 C2 C3 C4
761 * D0 D1 D2 D3 D4
762 * E0 E1 E2 E3 E4
763 * F0 F1 F2 F3 F4
764 * G0 G1 G2 G3 G4
765 * H0 H1 H2 H3 H4
766 *
767 * If you want to update this screen, you need to send 5 bytes:
768 * (1) A0 B0 C0 D0 E0 F0 G0 H0
769 * (2) A1 B1 C1 D1 E1 F1 G1 H1
770 * (3) A2 B2 C2 D2 E2 F2 G2 H2
771 * (4) A3 B3 C3 D3 E3 F3 G3 H3
772 * (5) A4 B4 C4 D4 E4 F4 G4 H4
773 */
774
775 if (!ssd130x->page_address_mode) {
776 u8 page_start;
777
778 /* Set address range for horizontal addressing mode */
779 ret = ssd130x_set_col_range(ssd130x, ssd130x->col_offset + x, width);
780 if (ret < 0)
781 return ret;
782
783 page_start = ssd130x->page_offset + y / page_height;
784 ret = ssd130x_set_page_range(ssd130x, page_start, pages);
785 if (ret < 0)
786 return ret;
787 }
788
789 for (i = 0; i < pages; i++) {
790 int m = page_height;
791
792 /* Last page may be partial */
793 if (page_height * (y / page_height + i + 1) > ssd130x->height)
794 m = ssd130x->height % page_height;
795
796 for (j = 0; j < width; j++) {
797 u8 data = 0;
798
799 for (k = 0; k < m; k++) {
800 u32 idx = (page_height * i + k) * line_length + j / 8;
801 u8 byte = buf[idx];
802 u8 bit = (byte >> (j % 8)) & 1;
803
804 data |= bit << k;
805 }
806 data_array[array_idx++] = data;
807 }
808
809 /*
810 * In page addressing mode, the start address needs to be reset,
811 * and each page then needs to be written out separately.
812 */
813 if (ssd130x->page_address_mode) {
814 ret = ssd130x_set_page_pos(ssd130x,
815 ssd130x->page_offset + i,
816 ssd130x->col_offset + x);
817 if (ret < 0)
818 return ret;
819
820 ret = ssd130x_write_data(ssd130x, data_array, width);
821 if (ret < 0)
822 return ret;
823
824 array_idx = 0;
825 }
826 }
827
828 /* Write out update in one go if we aren't using page addressing mode */
829 if (!ssd130x->page_address_mode)
830 ret = ssd130x_write_data(ssd130x, data_array, width * pages);
831
832 return ret;
833}
834
835static int ssd132x_update_rect(struct ssd130x_device *ssd130x,
836 struct drm_rect *rect, u8 *buf,
837 u8 *data_array)
838{
839 unsigned int x = rect->x1;
840 unsigned int y = rect->y1;
841 unsigned int segment_width = SSD132X_SEGMENT_WIDTH;
842 unsigned int width = drm_rect_width(rect);
843 unsigned int height = drm_rect_height(rect);
844 unsigned int columns = DIV_ROUND_UP(width, segment_width);
845 unsigned int rows = height;
846 struct drm_device *drm = &ssd130x->drm;
847 u32 array_idx = 0;
848 unsigned int i, j;
849 int ret;
850
851 drm_WARN_ONCE(drm, x % segment_width != 0, "x must be aligned to screen segment\n");
852
853 /*
854 * The screen is divided in Segment and Common outputs, where
855 * COM0 to COM[N - 1] are the rows and SEG0 to SEG[M - 1] are
856 * the columns.
857 *
858 * Each Segment has a 4-bit pixel and each Common output has a
859 * row of pixels. When using the (default) horizontal address
860 * increment mode, each byte of data sent to the controller has
861 * two Segments (e.g: SEG0 and SEG1) that are stored in the lower
862 * and higher nibbles of a single byte representing one column.
863 * That is, the first byte are SEG0 (D0[3:0]) and SEG1 (D0[7:4]),
864 * the second byte are SEG2 (D1[3:0]) and SEG3 (D1[7:4]) and so on.
865 */
866
867 /* Set column start and end */
868 ret = ssd130x_write_cmd(ssd130x, 3, SSD132X_SET_COL_RANGE, x / segment_width, columns - 1);
869 if (ret < 0)
870 return ret;
871
872 /* Set row start and end */
873 ret = ssd130x_write_cmd(ssd130x, 3, SSD132X_SET_ROW_RANGE, y, rows - 1);
874 if (ret < 0)
875 return ret;
876
877 for (i = 0; i < height; i++) {
878 /* Process pair of pixels and combine them into a single byte */
879 for (j = 0; j < width; j += segment_width) {
880 u8 n1 = buf[i * width + j];
881 u8 n2 = buf[i * width + j + 1];
882
883 data_array[array_idx++] = (n2 << 4) | n1;
884 }
885 }
886
887 /* Write out update in one go since horizontal addressing mode is used */
888 ret = ssd130x_write_data(ssd130x, data_array, columns * rows);
889
890 return ret;
891}
892
893static int ssd133x_update_rect(struct ssd130x_device *ssd130x,
894 struct drm_rect *rect, u8 *data_array,
895 unsigned int pitch)
896{
897 unsigned int x = rect->x1;
898 unsigned int y = rect->y1;
899 unsigned int columns = drm_rect_width(rect);
900 unsigned int rows = drm_rect_height(rect);
901 int ret;
902
903 /*
904 * The screen is divided in Segment and Common outputs, where
905 * COM0 to COM[N - 1] are the rows and SEG0 to SEG[M - 1] are
906 * the columns.
907 *
908 * Each Segment has a 8-bit pixel and each Common output has a
909 * row of pixels. When using the (default) horizontal address
910 * increment mode, each byte of data sent to the controller has
911 * a Segment (e.g: SEG0).
912 *
913 * When using the 256 color depth format, each pixel contains 3
914 * sub-pixels for color A, B and C. These have 3 bit, 3 bit and
915 * 2 bits respectively.
916 */
917
918 /* Set column start and end */
919 ret = ssd130x_write_cmd(ssd130x, 3, SSD133X_SET_COL_RANGE, x, columns - 1);
920 if (ret < 0)
921 return ret;
922
923 /* Set row start and end */
924 ret = ssd130x_write_cmd(ssd130x, 3, SSD133X_SET_ROW_RANGE, y, rows - 1);
925 if (ret < 0)
926 return ret;
927
928 /* Write out update in one go since horizontal addressing mode is used */
929 ret = ssd130x_write_data(ssd130x, data_array, pitch * rows);
930
931 return ret;
932}
933
934static void ssd130x_clear_screen(struct ssd130x_device *ssd130x, u8 *data_array)
935{
936 unsigned int pages = DIV_ROUND_UP(ssd130x->height, SSD130X_PAGE_HEIGHT);
937 unsigned int width = ssd130x->width;
938 int ret, i;
939
940 if (!ssd130x->page_address_mode) {
941 memset(data_array, 0, width * pages);
942
943 /* Set address range for horizontal addressing mode */
944 ret = ssd130x_set_col_range(ssd130x, ssd130x->col_offset, width);
945 if (ret < 0)
946 return;
947
948 ret = ssd130x_set_page_range(ssd130x, ssd130x->page_offset, pages);
949 if (ret < 0)
950 return;
951
952 /* Write out update in one go if we aren't using page addressing mode */
953 ssd130x_write_data(ssd130x, data_array, width * pages);
954 } else {
955 /*
956 * In page addressing mode, the start address needs to be reset,
957 * and each page then needs to be written out separately.
958 */
959 memset(data_array, 0, width);
960
961 for (i = 0; i < pages; i++) {
962 ret = ssd130x_set_page_pos(ssd130x,
963 ssd130x->page_offset + i,
964 ssd130x->col_offset);
965 if (ret < 0)
966 return;
967
968 ret = ssd130x_write_data(ssd130x, data_array, width);
969 if (ret < 0)
970 return;
971 }
972 }
973}
974
975static void ssd132x_clear_screen(struct ssd130x_device *ssd130x, u8 *data_array)
976{
977 unsigned int columns = DIV_ROUND_UP(ssd130x->height, SSD132X_SEGMENT_WIDTH);
978 unsigned int height = ssd130x->height;
979
980 memset(data_array, 0, columns * height);
981
982 /* Write out update in one go since horizontal addressing mode is used */
983 ssd130x_write_data(ssd130x, data_array, columns * height);
984}
985
986static void ssd133x_clear_screen(struct ssd130x_device *ssd130x, u8 *data_array)
987{
988 const struct drm_format_info *fi = drm_format_info(DRM_FORMAT_RGB332);
989 unsigned int pitch;
990
991 if (!fi)
992 return;
993
994 pitch = drm_format_info_min_pitch(fi, 0, ssd130x->width);
995
996 memset(data_array, 0, pitch * ssd130x->height);
997
998 /* Write out update in one go since horizontal addressing mode is used */
999 ssd130x_write_data(ssd130x, data_array, pitch * ssd130x->height);
1000}
1001
1002static int ssd130x_fb_blit_rect(struct drm_framebuffer *fb,
1003 const struct iosys_map *vmap,
1004 struct drm_rect *rect,
1005 u8 *buf, u8 *data_array,
1006 struct drm_format_conv_state *fmtcnv_state)
1007{
1008 struct ssd130x_device *ssd130x = drm_to_ssd130x(fb->dev);
1009 struct iosys_map dst;
1010 unsigned int dst_pitch;
1011 int ret = 0;
1012
1013 /* Align y to display page boundaries */
1014 rect->y1 = round_down(rect->y1, SSD130X_PAGE_HEIGHT);
1015 rect->y2 = min_t(unsigned int, round_up(rect->y2, SSD130X_PAGE_HEIGHT), ssd130x->height);
1016
1017 dst_pitch = DIV_ROUND_UP(drm_rect_width(rect), 8);
1018
1019 ret = drm_gem_fb_begin_cpu_access(fb, DMA_FROM_DEVICE);
1020 if (ret)
1021 return ret;
1022
1023 iosys_map_set_vaddr(&dst, buf);
1024 drm_fb_xrgb8888_to_mono(&dst, &dst_pitch, vmap, fb, rect, fmtcnv_state);
1025
1026 drm_gem_fb_end_cpu_access(fb, DMA_FROM_DEVICE);
1027
1028 ssd130x_update_rect(ssd130x, rect, buf, data_array);
1029
1030 return ret;
1031}
1032
1033static int ssd132x_fb_blit_rect(struct drm_framebuffer *fb,
1034 const struct iosys_map *vmap,
1035 struct drm_rect *rect, u8 *buf,
1036 u8 *data_array,
1037 struct drm_format_conv_state *fmtcnv_state)
1038{
1039 struct ssd130x_device *ssd130x = drm_to_ssd130x(fb->dev);
1040 unsigned int dst_pitch = drm_rect_width(rect);
1041 struct iosys_map dst;
1042 int ret = 0;
1043
1044 /* Align x to display segment boundaries */
1045 rect->x1 = round_down(rect->x1, SSD132X_SEGMENT_WIDTH);
1046 rect->x2 = min_t(unsigned int, round_up(rect->x2, SSD132X_SEGMENT_WIDTH),
1047 ssd130x->width);
1048
1049 ret = drm_gem_fb_begin_cpu_access(fb, DMA_FROM_DEVICE);
1050 if (ret)
1051 return ret;
1052
1053 iosys_map_set_vaddr(&dst, buf);
1054 drm_fb_xrgb8888_to_gray8(&dst, &dst_pitch, vmap, fb, rect, fmtcnv_state);
1055
1056 drm_gem_fb_end_cpu_access(fb, DMA_FROM_DEVICE);
1057
1058 ssd132x_update_rect(ssd130x, rect, buf, data_array);
1059
1060 return ret;
1061}
1062
1063static int ssd133x_fb_blit_rect(struct drm_framebuffer *fb,
1064 const struct iosys_map *vmap,
1065 struct drm_rect *rect, u8 *data_array,
1066 struct drm_format_conv_state *fmtcnv_state)
1067{
1068 struct ssd130x_device *ssd130x = drm_to_ssd130x(fb->dev);
1069 const struct drm_format_info *fi = drm_format_info(DRM_FORMAT_RGB332);
1070 unsigned int dst_pitch;
1071 struct iosys_map dst;
1072 int ret = 0;
1073
1074 if (!fi)
1075 return -EINVAL;
1076
1077 dst_pitch = drm_format_info_min_pitch(fi, 0, drm_rect_width(rect));
1078
1079 ret = drm_gem_fb_begin_cpu_access(fb, DMA_FROM_DEVICE);
1080 if (ret)
1081 return ret;
1082
1083 iosys_map_set_vaddr(&dst, data_array);
1084 drm_fb_xrgb8888_to_rgb332(&dst, &dst_pitch, vmap, fb, rect, fmtcnv_state);
1085
1086 drm_gem_fb_end_cpu_access(fb, DMA_FROM_DEVICE);
1087
1088 ssd133x_update_rect(ssd130x, rect, data_array, dst_pitch);
1089
1090 return ret;
1091}
1092
1093static int ssd130x_primary_plane_atomic_check(struct drm_plane *plane,
1094 struct drm_atomic_state *state)
1095{
1096 struct drm_device *drm = plane->dev;
1097 struct ssd130x_device *ssd130x = drm_to_ssd130x(drm);
1098 struct drm_plane_state *plane_state = drm_atomic_get_new_plane_state(state, plane);
1099 struct ssd130x_plane_state *ssd130x_state = to_ssd130x_plane_state(plane_state);
1100 struct drm_shadow_plane_state *shadow_plane_state = &ssd130x_state->base;
1101 struct drm_crtc *crtc = plane_state->crtc;
1102 struct drm_crtc_state *crtc_state = NULL;
1103 const struct drm_format_info *fi;
1104 unsigned int pitch;
1105 int ret;
1106
1107 if (crtc)
1108 crtc_state = drm_atomic_get_new_crtc_state(state, crtc);
1109
1110 ret = drm_atomic_helper_check_plane_state(plane_state, crtc_state,
1111 DRM_PLANE_NO_SCALING,
1112 DRM_PLANE_NO_SCALING,
1113 false, false);
1114 if (ret)
1115 return ret;
1116 else if (!plane_state->visible)
1117 return 0;
1118
1119 fi = drm_format_info(DRM_FORMAT_R1);
1120 if (!fi)
1121 return -EINVAL;
1122
1123 pitch = drm_format_info_min_pitch(fi, 0, ssd130x->width);
1124
1125 if (plane_state->fb->format != fi) {
1126 void *buf;
1127
1128 /* format conversion necessary; reserve buffer */
1129 buf = drm_format_conv_state_reserve(&shadow_plane_state->fmtcnv_state,
1130 pitch, GFP_KERNEL);
1131 if (!buf)
1132 return -ENOMEM;
1133 }
1134
1135 ssd130x_state->buffer = kcalloc(pitch, ssd130x->height, GFP_KERNEL);
1136 if (!ssd130x_state->buffer)
1137 return -ENOMEM;
1138
1139 return 0;
1140}
1141
1142static int ssd132x_primary_plane_atomic_check(struct drm_plane *plane,
1143 struct drm_atomic_state *state)
1144{
1145 struct drm_device *drm = plane->dev;
1146 struct ssd130x_device *ssd130x = drm_to_ssd130x(drm);
1147 struct drm_plane_state *plane_state = drm_atomic_get_new_plane_state(state, plane);
1148 struct ssd130x_plane_state *ssd130x_state = to_ssd130x_plane_state(plane_state);
1149 struct drm_shadow_plane_state *shadow_plane_state = &ssd130x_state->base;
1150 struct drm_crtc *crtc = plane_state->crtc;
1151 struct drm_crtc_state *crtc_state = NULL;
1152 const struct drm_format_info *fi;
1153 unsigned int pitch;
1154 int ret;
1155
1156 if (crtc)
1157 crtc_state = drm_atomic_get_new_crtc_state(state, crtc);
1158
1159 ret = drm_atomic_helper_check_plane_state(plane_state, crtc_state,
1160 DRM_PLANE_NO_SCALING,
1161 DRM_PLANE_NO_SCALING,
1162 false, false);
1163 if (ret)
1164 return ret;
1165 else if (!plane_state->visible)
1166 return 0;
1167
1168 fi = drm_format_info(DRM_FORMAT_R8);
1169 if (!fi)
1170 return -EINVAL;
1171
1172 pitch = drm_format_info_min_pitch(fi, 0, ssd130x->width);
1173
1174 if (plane_state->fb->format != fi) {
1175 void *buf;
1176
1177 /* format conversion necessary; reserve buffer */
1178 buf = drm_format_conv_state_reserve(&shadow_plane_state->fmtcnv_state,
1179 pitch, GFP_KERNEL);
1180 if (!buf)
1181 return -ENOMEM;
1182 }
1183
1184 ssd130x_state->buffer = kcalloc(pitch, ssd130x->height, GFP_KERNEL);
1185 if (!ssd130x_state->buffer)
1186 return -ENOMEM;
1187
1188 return 0;
1189}
1190
1191static int ssd133x_primary_plane_atomic_check(struct drm_plane *plane,
1192 struct drm_atomic_state *state)
1193{
1194 struct drm_plane_state *plane_state = drm_atomic_get_new_plane_state(state, plane);
1195 struct drm_crtc *crtc = plane_state->crtc;
1196 struct drm_crtc_state *crtc_state = NULL;
1197 int ret;
1198
1199 if (crtc)
1200 crtc_state = drm_atomic_get_new_crtc_state(state, crtc);
1201
1202 ret = drm_atomic_helper_check_plane_state(plane_state, crtc_state,
1203 DRM_PLANE_NO_SCALING,
1204 DRM_PLANE_NO_SCALING,
1205 false, false);
1206 if (ret)
1207 return ret;
1208 else if (!plane_state->visible)
1209 return 0;
1210
1211 return 0;
1212}
1213
1214static void ssd130x_primary_plane_atomic_update(struct drm_plane *plane,
1215 struct drm_atomic_state *state)
1216{
1217 struct drm_plane_state *plane_state = drm_atomic_get_new_plane_state(state, plane);
1218 struct drm_plane_state *old_plane_state = drm_atomic_get_old_plane_state(state, plane);
1219 struct drm_shadow_plane_state *shadow_plane_state = to_drm_shadow_plane_state(plane_state);
1220 struct drm_crtc_state *crtc_state = drm_atomic_get_new_crtc_state(state, plane_state->crtc);
1221 struct ssd130x_crtc_state *ssd130x_crtc_state = to_ssd130x_crtc_state(crtc_state);
1222 struct ssd130x_plane_state *ssd130x_plane_state = to_ssd130x_plane_state(plane_state);
1223 struct drm_framebuffer *fb = plane_state->fb;
1224 struct drm_atomic_helper_damage_iter iter;
1225 struct drm_device *drm = plane->dev;
1226 struct drm_rect dst_clip;
1227 struct drm_rect damage;
1228 int idx;
1229
1230 if (!drm_dev_enter(drm, &idx))
1231 return;
1232
1233 drm_atomic_helper_damage_iter_init(&iter, old_plane_state, plane_state);
1234 drm_atomic_for_each_plane_damage(&iter, &damage) {
1235 dst_clip = plane_state->dst;
1236
1237 if (!drm_rect_intersect(&dst_clip, &damage))
1238 continue;
1239
1240 ssd130x_fb_blit_rect(fb, &shadow_plane_state->data[0], &dst_clip,
1241 ssd130x_plane_state->buffer,
1242 ssd130x_crtc_state->data_array,
1243 &shadow_plane_state->fmtcnv_state);
1244 }
1245
1246 drm_dev_exit(idx);
1247}
1248
1249static void ssd132x_primary_plane_atomic_update(struct drm_plane *plane,
1250 struct drm_atomic_state *state)
1251{
1252 struct drm_plane_state *plane_state = drm_atomic_get_new_plane_state(state, plane);
1253 struct drm_plane_state *old_plane_state = drm_atomic_get_old_plane_state(state, plane);
1254 struct drm_shadow_plane_state *shadow_plane_state = to_drm_shadow_plane_state(plane_state);
1255 struct drm_crtc_state *crtc_state = drm_atomic_get_new_crtc_state(state, plane_state->crtc);
1256 struct ssd130x_crtc_state *ssd130x_crtc_state = to_ssd130x_crtc_state(crtc_state);
1257 struct ssd130x_plane_state *ssd130x_plane_state = to_ssd130x_plane_state(plane_state);
1258 struct drm_framebuffer *fb = plane_state->fb;
1259 struct drm_atomic_helper_damage_iter iter;
1260 struct drm_device *drm = plane->dev;
1261 struct drm_rect dst_clip;
1262 struct drm_rect damage;
1263 int idx;
1264
1265 if (!drm_dev_enter(drm, &idx))
1266 return;
1267
1268 drm_atomic_helper_damage_iter_init(&iter, old_plane_state, plane_state);
1269 drm_atomic_for_each_plane_damage(&iter, &damage) {
1270 dst_clip = plane_state->dst;
1271
1272 if (!drm_rect_intersect(&dst_clip, &damage))
1273 continue;
1274
1275 ssd132x_fb_blit_rect(fb, &shadow_plane_state->data[0], &dst_clip,
1276 ssd130x_plane_state->buffer,
1277 ssd130x_crtc_state->data_array,
1278 &shadow_plane_state->fmtcnv_state);
1279 }
1280
1281 drm_dev_exit(idx);
1282}
1283
1284static void ssd133x_primary_plane_atomic_update(struct drm_plane *plane,
1285 struct drm_atomic_state *state)
1286{
1287 struct drm_plane_state *plane_state = drm_atomic_get_new_plane_state(state, plane);
1288 struct drm_plane_state *old_plane_state = drm_atomic_get_old_plane_state(state, plane);
1289 struct drm_shadow_plane_state *shadow_plane_state = to_drm_shadow_plane_state(plane_state);
1290 struct drm_crtc_state *crtc_state = drm_atomic_get_new_crtc_state(state, plane_state->crtc);
1291 struct ssd130x_crtc_state *ssd130x_crtc_state = to_ssd130x_crtc_state(crtc_state);
1292 struct drm_framebuffer *fb = plane_state->fb;
1293 struct drm_atomic_helper_damage_iter iter;
1294 struct drm_device *drm = plane->dev;
1295 struct drm_rect dst_clip;
1296 struct drm_rect damage;
1297 int idx;
1298
1299 if (!drm_dev_enter(drm, &idx))
1300 return;
1301
1302 drm_atomic_helper_damage_iter_init(&iter, old_plane_state, plane_state);
1303 drm_atomic_for_each_plane_damage(&iter, &damage) {
1304 dst_clip = plane_state->dst;
1305
1306 if (!drm_rect_intersect(&dst_clip, &damage))
1307 continue;
1308
1309 ssd133x_fb_blit_rect(fb, &shadow_plane_state->data[0], &dst_clip,
1310 ssd130x_crtc_state->data_array,
1311 &shadow_plane_state->fmtcnv_state);
1312 }
1313
1314 drm_dev_exit(idx);
1315}
1316
1317static void ssd130x_primary_plane_atomic_disable(struct drm_plane *plane,
1318 struct drm_atomic_state *state)
1319{
1320 struct drm_device *drm = plane->dev;
1321 struct ssd130x_device *ssd130x = drm_to_ssd130x(drm);
1322 struct drm_plane_state *plane_state = drm_atomic_get_new_plane_state(state, plane);
1323 struct drm_crtc_state *crtc_state;
1324 struct ssd130x_crtc_state *ssd130x_crtc_state;
1325 int idx;
1326
1327 if (!plane_state->crtc)
1328 return;
1329
1330 crtc_state = drm_atomic_get_new_crtc_state(state, plane_state->crtc);
1331 ssd130x_crtc_state = to_ssd130x_crtc_state(crtc_state);
1332
1333 if (!drm_dev_enter(drm, &idx))
1334 return;
1335
1336 ssd130x_clear_screen(ssd130x, ssd130x_crtc_state->data_array);
1337
1338 drm_dev_exit(idx);
1339}
1340
1341static void ssd132x_primary_plane_atomic_disable(struct drm_plane *plane,
1342 struct drm_atomic_state *state)
1343{
1344 struct drm_device *drm = plane->dev;
1345 struct ssd130x_device *ssd130x = drm_to_ssd130x(drm);
1346 struct drm_plane_state *plane_state = drm_atomic_get_new_plane_state(state, plane);
1347 struct drm_crtc_state *crtc_state;
1348 struct ssd130x_crtc_state *ssd130x_crtc_state;
1349 int idx;
1350
1351 if (!plane_state->crtc)
1352 return;
1353
1354 crtc_state = drm_atomic_get_new_crtc_state(state, plane_state->crtc);
1355 ssd130x_crtc_state = to_ssd130x_crtc_state(crtc_state);
1356
1357 if (!drm_dev_enter(drm, &idx))
1358 return;
1359
1360 ssd132x_clear_screen(ssd130x, ssd130x_crtc_state->data_array);
1361
1362 drm_dev_exit(idx);
1363}
1364
1365static void ssd133x_primary_plane_atomic_disable(struct drm_plane *plane,
1366 struct drm_atomic_state *state)
1367{
1368 struct drm_device *drm = plane->dev;
1369 struct ssd130x_device *ssd130x = drm_to_ssd130x(drm);
1370 struct drm_plane_state *plane_state = drm_atomic_get_new_plane_state(state, plane);
1371 struct drm_crtc_state *crtc_state;
1372 struct ssd130x_crtc_state *ssd130x_crtc_state;
1373 int idx;
1374
1375 if (!plane_state->crtc)
1376 return;
1377
1378 crtc_state = drm_atomic_get_new_crtc_state(state, plane_state->crtc);
1379 ssd130x_crtc_state = to_ssd130x_crtc_state(crtc_state);
1380
1381 if (!drm_dev_enter(drm, &idx))
1382 return;
1383
1384 ssd133x_clear_screen(ssd130x, ssd130x_crtc_state->data_array);
1385
1386 drm_dev_exit(idx);
1387}
1388
1389/* Called during init to allocate the plane's atomic state. */
1390static void ssd130x_primary_plane_reset(struct drm_plane *plane)
1391{
1392 struct ssd130x_plane_state *ssd130x_state;
1393
1394 WARN_ON(plane->state);
1395
1396 ssd130x_state = kzalloc(sizeof(*ssd130x_state), GFP_KERNEL);
1397 if (!ssd130x_state)
1398 return;
1399
1400 __drm_gem_reset_shadow_plane(plane, &ssd130x_state->base);
1401}
1402
1403static struct drm_plane_state *ssd130x_primary_plane_duplicate_state(struct drm_plane *plane)
1404{
1405 struct drm_shadow_plane_state *new_shadow_plane_state;
1406 struct ssd130x_plane_state *old_ssd130x_state;
1407 struct ssd130x_plane_state *ssd130x_state;
1408
1409 if (WARN_ON(!plane->state))
1410 return NULL;
1411
1412 old_ssd130x_state = to_ssd130x_plane_state(plane->state);
1413 ssd130x_state = kmemdup(old_ssd130x_state, sizeof(*ssd130x_state), GFP_KERNEL);
1414 if (!ssd130x_state)
1415 return NULL;
1416
1417 /* The buffer is not duplicated and is allocated in .atomic_check */
1418 ssd130x_state->buffer = NULL;
1419
1420 new_shadow_plane_state = &ssd130x_state->base;
1421
1422 __drm_gem_duplicate_shadow_plane_state(plane, new_shadow_plane_state);
1423
1424 return &new_shadow_plane_state->base;
1425}
1426
1427static void ssd130x_primary_plane_destroy_state(struct drm_plane *plane,
1428 struct drm_plane_state *state)
1429{
1430 struct ssd130x_plane_state *ssd130x_state = to_ssd130x_plane_state(state);
1431
1432 kfree(ssd130x_state->buffer);
1433
1434 __drm_gem_destroy_shadow_plane_state(&ssd130x_state->base);
1435
1436 kfree(ssd130x_state);
1437}
1438
1439static const struct drm_plane_helper_funcs ssd130x_primary_plane_helper_funcs[] = {
1440 [SSD130X_FAMILY] = {
1441 DRM_GEM_SHADOW_PLANE_HELPER_FUNCS,
1442 .atomic_check = ssd130x_primary_plane_atomic_check,
1443 .atomic_update = ssd130x_primary_plane_atomic_update,
1444 .atomic_disable = ssd130x_primary_plane_atomic_disable,
1445 },
1446 [SSD132X_FAMILY] = {
1447 DRM_GEM_SHADOW_PLANE_HELPER_FUNCS,
1448 .atomic_check = ssd132x_primary_plane_atomic_check,
1449 .atomic_update = ssd132x_primary_plane_atomic_update,
1450 .atomic_disable = ssd132x_primary_plane_atomic_disable,
1451 },
1452 [SSD133X_FAMILY] = {
1453 DRM_GEM_SHADOW_PLANE_HELPER_FUNCS,
1454 .atomic_check = ssd133x_primary_plane_atomic_check,
1455 .atomic_update = ssd133x_primary_plane_atomic_update,
1456 .atomic_disable = ssd133x_primary_plane_atomic_disable,
1457 }
1458};
1459
1460static const struct drm_plane_funcs ssd130x_primary_plane_funcs = {
1461 .update_plane = drm_atomic_helper_update_plane,
1462 .disable_plane = drm_atomic_helper_disable_plane,
1463 .reset = ssd130x_primary_plane_reset,
1464 .atomic_duplicate_state = ssd130x_primary_plane_duplicate_state,
1465 .atomic_destroy_state = ssd130x_primary_plane_destroy_state,
1466 .destroy = drm_plane_cleanup,
1467};
1468
1469static enum drm_mode_status ssd130x_crtc_mode_valid(struct drm_crtc *crtc,
1470 const struct drm_display_mode *mode)
1471{
1472 struct ssd130x_device *ssd130x = drm_to_ssd130x(crtc->dev);
1473
1474 if (mode->hdisplay != ssd130x->mode.hdisplay &&
1475 mode->vdisplay != ssd130x->mode.vdisplay)
1476 return MODE_ONE_SIZE;
1477 else if (mode->hdisplay != ssd130x->mode.hdisplay)
1478 return MODE_ONE_WIDTH;
1479 else if (mode->vdisplay != ssd130x->mode.vdisplay)
1480 return MODE_ONE_HEIGHT;
1481
1482 return MODE_OK;
1483}
1484
1485static int ssd130x_crtc_atomic_check(struct drm_crtc *crtc,
1486 struct drm_atomic_state *state)
1487{
1488 struct drm_device *drm = crtc->dev;
1489 struct ssd130x_device *ssd130x = drm_to_ssd130x(drm);
1490 struct drm_crtc_state *crtc_state = drm_atomic_get_new_crtc_state(state, crtc);
1491 struct ssd130x_crtc_state *ssd130x_state = to_ssd130x_crtc_state(crtc_state);
1492 unsigned int pages = DIV_ROUND_UP(ssd130x->height, SSD130X_PAGE_HEIGHT);
1493 int ret;
1494
1495 ret = drm_crtc_helper_atomic_check(crtc, state);
1496 if (ret)
1497 return ret;
1498
1499 ssd130x_state->data_array = kmalloc(ssd130x->width * pages, GFP_KERNEL);
1500 if (!ssd130x_state->data_array)
1501 return -ENOMEM;
1502
1503 return 0;
1504}
1505
1506static int ssd132x_crtc_atomic_check(struct drm_crtc *crtc,
1507 struct drm_atomic_state *state)
1508{
1509 struct drm_device *drm = crtc->dev;
1510 struct ssd130x_device *ssd130x = drm_to_ssd130x(drm);
1511 struct drm_crtc_state *crtc_state = drm_atomic_get_new_crtc_state(state, crtc);
1512 struct ssd130x_crtc_state *ssd130x_state = to_ssd130x_crtc_state(crtc_state);
1513 unsigned int columns = DIV_ROUND_UP(ssd130x->width, SSD132X_SEGMENT_WIDTH);
1514 int ret;
1515
1516 ret = drm_crtc_helper_atomic_check(crtc, state);
1517 if (ret)
1518 return ret;
1519
1520 ssd130x_state->data_array = kmalloc(columns * ssd130x->height, GFP_KERNEL);
1521 if (!ssd130x_state->data_array)
1522 return -ENOMEM;
1523
1524 return 0;
1525}
1526
1527static int ssd133x_crtc_atomic_check(struct drm_crtc *crtc,
1528 struct drm_atomic_state *state)
1529{
1530 struct drm_device *drm = crtc->dev;
1531 struct ssd130x_device *ssd130x = drm_to_ssd130x(drm);
1532 struct drm_crtc_state *crtc_state = drm_atomic_get_new_crtc_state(state, crtc);
1533 struct ssd130x_crtc_state *ssd130x_state = to_ssd130x_crtc_state(crtc_state);
1534 const struct drm_format_info *fi = drm_format_info(DRM_FORMAT_RGB332);
1535 unsigned int pitch;
1536 int ret;
1537
1538 if (!fi)
1539 return -EINVAL;
1540
1541 ret = drm_crtc_helper_atomic_check(crtc, state);
1542 if (ret)
1543 return ret;
1544
1545 pitch = drm_format_info_min_pitch(fi, 0, ssd130x->width);
1546
1547 ssd130x_state->data_array = kmalloc(pitch * ssd130x->height, GFP_KERNEL);
1548 if (!ssd130x_state->data_array)
1549 return -ENOMEM;
1550
1551 return 0;
1552}
1553
1554/* Called during init to allocate the CRTC's atomic state. */
1555static void ssd130x_crtc_reset(struct drm_crtc *crtc)
1556{
1557 struct ssd130x_crtc_state *ssd130x_state;
1558
1559 WARN_ON(crtc->state);
1560
1561 ssd130x_state = kzalloc(sizeof(*ssd130x_state), GFP_KERNEL);
1562 if (!ssd130x_state)
1563 return;
1564
1565 __drm_atomic_helper_crtc_reset(crtc, &ssd130x_state->base);
1566}
1567
1568static struct drm_crtc_state *ssd130x_crtc_duplicate_state(struct drm_crtc *crtc)
1569{
1570 struct ssd130x_crtc_state *old_ssd130x_state;
1571 struct ssd130x_crtc_state *ssd130x_state;
1572
1573 if (WARN_ON(!crtc->state))
1574 return NULL;
1575
1576 old_ssd130x_state = to_ssd130x_crtc_state(crtc->state);
1577 ssd130x_state = kmemdup(old_ssd130x_state, sizeof(*ssd130x_state), GFP_KERNEL);
1578 if (!ssd130x_state)
1579 return NULL;
1580
1581 /* The buffer is not duplicated and is allocated in .atomic_check */
1582 ssd130x_state->data_array = NULL;
1583
1584 __drm_atomic_helper_crtc_duplicate_state(crtc, &ssd130x_state->base);
1585
1586 return &ssd130x_state->base;
1587}
1588
1589static void ssd130x_crtc_destroy_state(struct drm_crtc *crtc,
1590 struct drm_crtc_state *state)
1591{
1592 struct ssd130x_crtc_state *ssd130x_state = to_ssd130x_crtc_state(state);
1593
1594 kfree(ssd130x_state->data_array);
1595
1596 __drm_atomic_helper_crtc_destroy_state(state);
1597
1598 kfree(ssd130x_state);
1599}
1600
1601/*
1602 * The CRTC is always enabled. Screen updates are performed by
1603 * the primary plane's atomic_update function. Disabling clears
1604 * the screen in the primary plane's atomic_disable function.
1605 */
1606static const struct drm_crtc_helper_funcs ssd130x_crtc_helper_funcs[] = {
1607 [SSD130X_FAMILY] = {
1608 .mode_valid = ssd130x_crtc_mode_valid,
1609 .atomic_check = ssd130x_crtc_atomic_check,
1610 },
1611 [SSD132X_FAMILY] = {
1612 .mode_valid = ssd130x_crtc_mode_valid,
1613 .atomic_check = ssd132x_crtc_atomic_check,
1614 },
1615 [SSD133X_FAMILY] = {
1616 .mode_valid = ssd130x_crtc_mode_valid,
1617 .atomic_check = ssd133x_crtc_atomic_check,
1618 },
1619};
1620
1621static const struct drm_crtc_funcs ssd130x_crtc_funcs = {
1622 .reset = ssd130x_crtc_reset,
1623 .destroy = drm_crtc_cleanup,
1624 .set_config = drm_atomic_helper_set_config,
1625 .page_flip = drm_atomic_helper_page_flip,
1626 .atomic_duplicate_state = ssd130x_crtc_duplicate_state,
1627 .atomic_destroy_state = ssd130x_crtc_destroy_state,
1628};
1629
1630static void ssd130x_encoder_atomic_enable(struct drm_encoder *encoder,
1631 struct drm_atomic_state *state)
1632{
1633 struct drm_device *drm = encoder->dev;
1634 struct ssd130x_device *ssd130x = drm_to_ssd130x(drm);
1635 int ret;
1636
1637 ret = ssd130x_power_on(ssd130x);
1638 if (ret)
1639 return;
1640
1641 ret = ssd130x_init(ssd130x);
1642 if (ret)
1643 goto power_off;
1644
1645 ssd130x_write_cmd(ssd130x, 1, SSD13XX_DISPLAY_ON);
1646
1647 backlight_enable(ssd130x->bl_dev);
1648
1649 return;
1650
1651power_off:
1652 ssd130x_power_off(ssd130x);
1653 return;
1654}
1655
1656static void ssd132x_encoder_atomic_enable(struct drm_encoder *encoder,
1657 struct drm_atomic_state *state)
1658{
1659 struct drm_device *drm = encoder->dev;
1660 struct ssd130x_device *ssd130x = drm_to_ssd130x(drm);
1661 int ret;
1662
1663 ret = ssd130x_power_on(ssd130x);
1664 if (ret)
1665 return;
1666
1667 ret = ssd132x_init(ssd130x);
1668 if (ret)
1669 goto power_off;
1670
1671 ssd130x_write_cmd(ssd130x, 1, SSD13XX_DISPLAY_ON);
1672
1673 backlight_enable(ssd130x->bl_dev);
1674
1675 return;
1676
1677power_off:
1678 ssd130x_power_off(ssd130x);
1679}
1680
1681static void ssd133x_encoder_atomic_enable(struct drm_encoder *encoder,
1682 struct drm_atomic_state *state)
1683{
1684 struct drm_device *drm = encoder->dev;
1685 struct ssd130x_device *ssd130x = drm_to_ssd130x(drm);
1686 int ret;
1687
1688 ret = ssd130x_power_on(ssd130x);
1689 if (ret)
1690 return;
1691
1692 ret = ssd133x_init(ssd130x);
1693 if (ret)
1694 goto power_off;
1695
1696 ssd130x_write_cmd(ssd130x, 1, SSD13XX_DISPLAY_ON);
1697
1698 backlight_enable(ssd130x->bl_dev);
1699
1700 return;
1701
1702power_off:
1703 ssd130x_power_off(ssd130x);
1704}
1705
1706static void ssd130x_encoder_atomic_disable(struct drm_encoder *encoder,
1707 struct drm_atomic_state *state)
1708{
1709 struct drm_device *drm = encoder->dev;
1710 struct ssd130x_device *ssd130x = drm_to_ssd130x(drm);
1711
1712 backlight_disable(ssd130x->bl_dev);
1713
1714 ssd130x_write_cmd(ssd130x, 1, SSD13XX_DISPLAY_OFF);
1715
1716 ssd130x_power_off(ssd130x);
1717}
1718
1719static const struct drm_encoder_helper_funcs ssd130x_encoder_helper_funcs[] = {
1720 [SSD130X_FAMILY] = {
1721 .atomic_enable = ssd130x_encoder_atomic_enable,
1722 .atomic_disable = ssd130x_encoder_atomic_disable,
1723 },
1724 [SSD132X_FAMILY] = {
1725 .atomic_enable = ssd132x_encoder_atomic_enable,
1726 .atomic_disable = ssd130x_encoder_atomic_disable,
1727 },
1728 [SSD133X_FAMILY] = {
1729 .atomic_enable = ssd133x_encoder_atomic_enable,
1730 .atomic_disable = ssd130x_encoder_atomic_disable,
1731 }
1732};
1733
1734static const struct drm_encoder_funcs ssd130x_encoder_funcs = {
1735 .destroy = drm_encoder_cleanup,
1736};
1737
1738static int ssd130x_connector_get_modes(struct drm_connector *connector)
1739{
1740 struct ssd130x_device *ssd130x = drm_to_ssd130x(connector->dev);
1741 struct drm_display_mode *mode;
1742 struct device *dev = ssd130x->dev;
1743
1744 mode = drm_mode_duplicate(connector->dev, &ssd130x->mode);
1745 if (!mode) {
1746 dev_err(dev, "Failed to duplicated mode\n");
1747 return 0;
1748 }
1749
1750 drm_mode_probed_add(connector, mode);
1751 drm_set_preferred_mode(connector, mode->hdisplay, mode->vdisplay);
1752
1753 /* There is only a single mode */
1754 return 1;
1755}
1756
1757static const struct drm_connector_helper_funcs ssd130x_connector_helper_funcs = {
1758 .get_modes = ssd130x_connector_get_modes,
1759};
1760
1761static const struct drm_connector_funcs ssd130x_connector_funcs = {
1762 .reset = drm_atomic_helper_connector_reset,
1763 .fill_modes = drm_helper_probe_single_connector_modes,
1764 .destroy = drm_connector_cleanup,
1765 .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
1766 .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
1767};
1768
1769static const struct drm_mode_config_funcs ssd130x_mode_config_funcs = {
1770 .fb_create = drm_gem_fb_create_with_dirty,
1771 .atomic_check = drm_atomic_helper_check,
1772 .atomic_commit = drm_atomic_helper_commit,
1773};
1774
1775static const uint32_t ssd130x_formats[] = {
1776 DRM_FORMAT_XRGB8888,
1777};
1778
1779DEFINE_DRM_GEM_FOPS(ssd130x_fops);
1780
1781static const struct drm_driver ssd130x_drm_driver = {
1782 DRM_GEM_SHMEM_DRIVER_OPS,
1783 .name = DRIVER_NAME,
1784 .desc = DRIVER_DESC,
1785 .date = DRIVER_DATE,
1786 .major = DRIVER_MAJOR,
1787 .minor = DRIVER_MINOR,
1788 .driver_features = DRIVER_ATOMIC | DRIVER_GEM | DRIVER_MODESET,
1789 .fops = &ssd130x_fops,
1790};
1791
1792static int ssd130x_update_bl(struct backlight_device *bdev)
1793{
1794 struct ssd130x_device *ssd130x = bl_get_data(bdev);
1795 int brightness = backlight_get_brightness(bdev);
1796 int ret;
1797
1798 ssd130x->contrast = brightness;
1799
1800 ret = ssd130x_write_cmd(ssd130x, 1, SSD13XX_CONTRAST);
1801 if (ret < 0)
1802 return ret;
1803
1804 ret = ssd130x_write_cmd(ssd130x, 1, ssd130x->contrast);
1805 if (ret < 0)
1806 return ret;
1807
1808 return 0;
1809}
1810
1811static const struct backlight_ops ssd130xfb_bl_ops = {
1812 .update_status = ssd130x_update_bl,
1813};
1814
1815static void ssd130x_parse_properties(struct ssd130x_device *ssd130x)
1816{
1817 struct device *dev = ssd130x->dev;
1818
1819 if (device_property_read_u32(dev, "solomon,width", &ssd130x->width))
1820 ssd130x->width = ssd130x->device_info->default_width;
1821
1822 if (device_property_read_u32(dev, "solomon,height", &ssd130x->height))
1823 ssd130x->height = ssd130x->device_info->default_height;
1824
1825 if (device_property_read_u32(dev, "solomon,page-offset", &ssd130x->page_offset))
1826 ssd130x->page_offset = 1;
1827
1828 if (device_property_read_u32(dev, "solomon,col-offset", &ssd130x->col_offset))
1829 ssd130x->col_offset = 0;
1830
1831 if (device_property_read_u32(dev, "solomon,com-offset", &ssd130x->com_offset))
1832 ssd130x->com_offset = 0;
1833
1834 if (device_property_read_u32(dev, "solomon,prechargep1", &ssd130x->prechargep1))
1835 ssd130x->prechargep1 = 2;
1836
1837 if (device_property_read_u32(dev, "solomon,prechargep2", &ssd130x->prechargep2))
1838 ssd130x->prechargep2 = 2;
1839
1840 if (!device_property_read_u8_array(dev, "solomon,lookup-table",
1841 ssd130x->lookup_table,
1842 ARRAY_SIZE(ssd130x->lookup_table)))
1843 ssd130x->lookup_table_set = 1;
1844
1845 ssd130x->seg_remap = !device_property_read_bool(dev, "solomon,segment-no-remap");
1846 ssd130x->com_seq = device_property_read_bool(dev, "solomon,com-seq");
1847 ssd130x->com_lrremap = device_property_read_bool(dev, "solomon,com-lrremap");
1848 ssd130x->com_invdir = device_property_read_bool(dev, "solomon,com-invdir");
1849 ssd130x->area_color_enable =
1850 device_property_read_bool(dev, "solomon,area-color-enable");
1851 ssd130x->low_power = device_property_read_bool(dev, "solomon,low-power");
1852
1853 ssd130x->contrast = 127;
1854 ssd130x->vcomh = ssd130x->device_info->default_vcomh;
1855
1856 /* Setup display timing */
1857 if (device_property_read_u32(dev, "solomon,dclk-div", &ssd130x->dclk_div))
1858 ssd130x->dclk_div = ssd130x->device_info->default_dclk_div;
1859 if (device_property_read_u32(dev, "solomon,dclk-frq", &ssd130x->dclk_frq))
1860 ssd130x->dclk_frq = ssd130x->device_info->default_dclk_frq;
1861}
1862
1863static int ssd130x_init_modeset(struct ssd130x_device *ssd130x)
1864{
1865 enum ssd130x_family_ids family_id = ssd130x->device_info->family_id;
1866 struct drm_display_mode *mode = &ssd130x->mode;
1867 struct device *dev = ssd130x->dev;
1868 struct drm_device *drm = &ssd130x->drm;
1869 unsigned long max_width, max_height;
1870 struct drm_plane *primary_plane;
1871 struct drm_crtc *crtc;
1872 struct drm_encoder *encoder;
1873 struct drm_connector *connector;
1874 int ret;
1875
1876 /*
1877 * Modesetting
1878 */
1879
1880 ret = drmm_mode_config_init(drm);
1881 if (ret) {
1882 dev_err(dev, "DRM mode config init failed: %d\n", ret);
1883 return ret;
1884 }
1885
1886 mode->type = DRM_MODE_TYPE_DRIVER;
1887 mode->clock = 1;
1888 mode->hdisplay = mode->htotal = ssd130x->width;
1889 mode->hsync_start = mode->hsync_end = ssd130x->width;
1890 mode->vdisplay = mode->vtotal = ssd130x->height;
1891 mode->vsync_start = mode->vsync_end = ssd130x->height;
1892 mode->width_mm = 27;
1893 mode->height_mm = 27;
1894
1895 max_width = max_t(unsigned long, mode->hdisplay, DRM_SHADOW_PLANE_MAX_WIDTH);
1896 max_height = max_t(unsigned long, mode->vdisplay, DRM_SHADOW_PLANE_MAX_HEIGHT);
1897
1898 drm->mode_config.min_width = mode->hdisplay;
1899 drm->mode_config.max_width = max_width;
1900 drm->mode_config.min_height = mode->vdisplay;
1901 drm->mode_config.max_height = max_height;
1902 drm->mode_config.preferred_depth = 24;
1903 drm->mode_config.funcs = &ssd130x_mode_config_funcs;
1904
1905 /* Primary plane */
1906
1907 primary_plane = &ssd130x->primary_plane;
1908 ret = drm_universal_plane_init(drm, primary_plane, 0, &ssd130x_primary_plane_funcs,
1909 ssd130x_formats, ARRAY_SIZE(ssd130x_formats),
1910 NULL, DRM_PLANE_TYPE_PRIMARY, NULL);
1911 if (ret) {
1912 dev_err(dev, "DRM primary plane init failed: %d\n", ret);
1913 return ret;
1914 }
1915
1916 drm_plane_helper_add(primary_plane, &ssd130x_primary_plane_helper_funcs[family_id]);
1917
1918 drm_plane_enable_fb_damage_clips(primary_plane);
1919
1920 /* CRTC */
1921
1922 crtc = &ssd130x->crtc;
1923 ret = drm_crtc_init_with_planes(drm, crtc, primary_plane, NULL,
1924 &ssd130x_crtc_funcs, NULL);
1925 if (ret) {
1926 dev_err(dev, "DRM crtc init failed: %d\n", ret);
1927 return ret;
1928 }
1929
1930 drm_crtc_helper_add(crtc, &ssd130x_crtc_helper_funcs[family_id]);
1931
1932 /* Encoder */
1933
1934 encoder = &ssd130x->encoder;
1935 ret = drm_encoder_init(drm, encoder, &ssd130x_encoder_funcs,
1936 DRM_MODE_ENCODER_NONE, NULL);
1937 if (ret) {
1938 dev_err(dev, "DRM encoder init failed: %d\n", ret);
1939 return ret;
1940 }
1941
1942 drm_encoder_helper_add(encoder, &ssd130x_encoder_helper_funcs[family_id]);
1943
1944 encoder->possible_crtcs = drm_crtc_mask(crtc);
1945
1946 /* Connector */
1947
1948 connector = &ssd130x->connector;
1949 ret = drm_connector_init(drm, connector, &ssd130x_connector_funcs,
1950 DRM_MODE_CONNECTOR_Unknown);
1951 if (ret) {
1952 dev_err(dev, "DRM connector init failed: %d\n", ret);
1953 return ret;
1954 }
1955
1956 drm_connector_helper_add(connector, &ssd130x_connector_helper_funcs);
1957
1958 ret = drm_connector_attach_encoder(connector, encoder);
1959 if (ret) {
1960 dev_err(dev, "DRM attach connector to encoder failed: %d\n", ret);
1961 return ret;
1962 }
1963
1964 drm_mode_config_reset(drm);
1965
1966 return 0;
1967}
1968
1969static int ssd130x_get_resources(struct ssd130x_device *ssd130x)
1970{
1971 struct device *dev = ssd130x->dev;
1972
1973 ssd130x->reset = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_LOW);
1974 if (IS_ERR(ssd130x->reset))
1975 return dev_err_probe(dev, PTR_ERR(ssd130x->reset),
1976 "Failed to get reset gpio\n");
1977
1978 ssd130x->vcc_reg = devm_regulator_get(dev, "vcc");
1979 if (IS_ERR(ssd130x->vcc_reg))
1980 return dev_err_probe(dev, PTR_ERR(ssd130x->vcc_reg),
1981 "Failed to get VCC regulator\n");
1982
1983 return 0;
1984}
1985
1986struct ssd130x_device *ssd130x_probe(struct device *dev, struct regmap *regmap)
1987{
1988 struct ssd130x_device *ssd130x;
1989 struct backlight_device *bl;
1990 struct drm_device *drm;
1991 int ret;
1992
1993 ssd130x = devm_drm_dev_alloc(dev, &ssd130x_drm_driver,
1994 struct ssd130x_device, drm);
1995 if (IS_ERR(ssd130x))
1996 return ERR_PTR(dev_err_probe(dev, PTR_ERR(ssd130x),
1997 "Failed to allocate DRM device\n"));
1998
1999 drm = &ssd130x->drm;
2000
2001 ssd130x->dev = dev;
2002 ssd130x->regmap = regmap;
2003 ssd130x->device_info = device_get_match_data(dev);
2004
2005 if (ssd130x->device_info->page_mode_only)
2006 ssd130x->page_address_mode = 1;
2007
2008 ssd130x_parse_properties(ssd130x);
2009
2010 ret = ssd130x_get_resources(ssd130x);
2011 if (ret)
2012 return ERR_PTR(ret);
2013
2014 bl = devm_backlight_device_register(dev, dev_name(dev), dev, ssd130x,
2015 &ssd130xfb_bl_ops, NULL);
2016 if (IS_ERR(bl))
2017 return ERR_PTR(dev_err_probe(dev, PTR_ERR(bl),
2018 "Unable to register backlight device\n"));
2019
2020 bl->props.brightness = ssd130x->contrast;
2021 bl->props.max_brightness = MAX_CONTRAST;
2022 ssd130x->bl_dev = bl;
2023
2024 ret = ssd130x_init_modeset(ssd130x);
2025 if (ret)
2026 return ERR_PTR(ret);
2027
2028 ret = drm_dev_register(drm, 0);
2029 if (ret)
2030 return ERR_PTR(dev_err_probe(dev, ret, "DRM device register failed\n"));
2031
2032 drm_fbdev_generic_setup(drm, 32);
2033
2034 return ssd130x;
2035}
2036EXPORT_SYMBOL_GPL(ssd130x_probe);
2037
2038void ssd130x_remove(struct ssd130x_device *ssd130x)
2039{
2040 drm_dev_unplug(&ssd130x->drm);
2041 drm_atomic_helper_shutdown(&ssd130x->drm);
2042}
2043EXPORT_SYMBOL_GPL(ssd130x_remove);
2044
2045void ssd130x_shutdown(struct ssd130x_device *ssd130x)
2046{
2047 drm_atomic_helper_shutdown(&ssd130x->drm);
2048}
2049EXPORT_SYMBOL_GPL(ssd130x_shutdown);
2050
2051MODULE_DESCRIPTION(DRIVER_DESC);
2052MODULE_AUTHOR("Javier Martinez Canillas <javierm@redhat.com>");
2053MODULE_LICENSE("GPL v2");