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ec95a68d SH |
1 | // SPDX-License-Identifier: GPL-2.0 |
2 | /* | |
3 | * Copyright (C) 2021-2023 Samuel Holland <samuel@sholland.org> | |
4 | * | |
5 | * Partly based on drivers/leds/leds-turris-omnia.c, which is: | |
6 | * Copyright (c) 2020 by Marek BehĂșn <kabel@kernel.org> | |
7 | */ | |
8 | ||
9 | #include <linux/bitfield.h> | |
10 | #include <linux/clk.h> | |
11 | #include <linux/delay.h> | |
12 | #include <linux/dma-mapping.h> | |
13 | #include <linux/dmaengine.h> | |
14 | #include <linux/interrupt.h> | |
15 | #include <linux/io.h> | |
16 | #include <linux/led-class-multicolor.h> | |
17 | #include <linux/leds.h> | |
06c5206c | 18 | #include <linux/mod_devicetable.h> |
ec95a68d | 19 | #include <linux/module.h> |
ec95a68d SH |
20 | #include <linux/platform_device.h> |
21 | #include <linux/pm.h> | |
06c5206c | 22 | #include <linux/property.h> |
ec95a68d SH |
23 | #include <linux/reset.h> |
24 | #include <linux/spinlock.h> | |
25 | ||
26 | #define LEDC_CTRL_REG 0x0000 | |
27 | #define LEDC_CTRL_REG_DATA_LENGTH GENMASK(28, 16) | |
28 | #define LEDC_CTRL_REG_RGB_MODE GENMASK(8, 6) | |
29 | #define LEDC_CTRL_REG_LEDC_EN BIT(0) | |
30 | #define LEDC_T01_TIMING_CTRL_REG 0x0004 | |
31 | #define LEDC_T01_TIMING_CTRL_REG_T1H GENMASK(26, 21) | |
32 | #define LEDC_T01_TIMING_CTRL_REG_T1L GENMASK(20, 16) | |
33 | #define LEDC_T01_TIMING_CTRL_REG_T0H GENMASK(10, 6) | |
34 | #define LEDC_T01_TIMING_CTRL_REG_T0L GENMASK(5, 0) | |
35 | #define LEDC_RESET_TIMING_CTRL_REG 0x000c | |
36 | #define LEDC_RESET_TIMING_CTRL_REG_TR GENMASK(28, 16) | |
37 | #define LEDC_RESET_TIMING_CTRL_REG_LED_NUM GENMASK(9, 0) | |
38 | #define LEDC_DATA_REG 0x0014 | |
39 | #define LEDC_DMA_CTRL_REG 0x0018 | |
40 | #define LEDC_DMA_CTRL_REG_DMA_EN BIT(5) | |
41 | #define LEDC_DMA_CTRL_REG_FIFO_TRIG_LEVEL GENMASK(4, 0) | |
42 | #define LEDC_INT_CTRL_REG 0x001c | |
43 | #define LEDC_INT_CTRL_REG_GLOBAL_INT_EN BIT(5) | |
44 | #define LEDC_INT_CTRL_REG_FIFO_CPUREQ_INT_EN BIT(1) | |
45 | #define LEDC_INT_CTRL_REG_TRANS_FINISH_INT_EN BIT(0) | |
46 | #define LEDC_INT_STS_REG 0x0020 | |
47 | #define LEDC_INT_STS_REG_FIFO_WLW GENMASK(15, 10) | |
48 | #define LEDC_INT_STS_REG_FIFO_CPUREQ_INT BIT(1) | |
49 | #define LEDC_INT_STS_REG_TRANS_FINISH_INT BIT(0) | |
50 | ||
51 | #define LEDC_FIFO_DEPTH 32U | |
52 | #define LEDC_MAX_LEDS 1024 | |
53 | #define LEDC_CHANNELS_PER_LED 3 /* RGB */ | |
54 | ||
55 | #define LEDS_TO_BYTES(n) ((n) * sizeof(u32)) | |
56 | ||
57 | struct sun50i_a100_ledc_led { | |
58 | struct led_classdev_mc mc_cdev; | |
59 | struct mc_subled subled_info[LEDC_CHANNELS_PER_LED]; | |
60 | u32 addr; | |
61 | }; | |
62 | ||
63 | #define to_ledc_led(mc) container_of(mc, struct sun50i_a100_ledc_led, mc_cdev) | |
64 | ||
65 | struct sun50i_a100_ledc_timing { | |
66 | u32 t0h_ns; | |
67 | u32 t0l_ns; | |
68 | u32 t1h_ns; | |
69 | u32 t1l_ns; | |
70 | u32 treset_ns; | |
71 | }; | |
72 | ||
73 | struct sun50i_a100_ledc { | |
74 | struct device *dev; | |
75 | void __iomem *base; | |
76 | struct clk *bus_clk; | |
77 | struct clk *mod_clk; | |
78 | struct reset_control *reset; | |
79 | ||
80 | u32 *buffer; | |
81 | struct dma_chan *dma_chan; | |
82 | dma_addr_t dma_handle; | |
83 | unsigned int pio_length; | |
84 | unsigned int pio_offset; | |
85 | ||
86 | spinlock_t lock; | |
87 | unsigned int next_length; | |
88 | bool xfer_active; | |
89 | ||
90 | u32 format; | |
91 | struct sun50i_a100_ledc_timing timing; | |
92 | ||
93 | u32 max_addr; | |
94 | u32 num_leds; | |
95 | struct sun50i_a100_ledc_led leds[] __counted_by(num_leds); | |
96 | }; | |
97 | ||
98 | static int sun50i_a100_ledc_dma_xfer(struct sun50i_a100_ledc *priv, unsigned int length) | |
99 | { | |
100 | struct dma_async_tx_descriptor *desc; | |
101 | dma_cookie_t cookie; | |
102 | ||
103 | desc = dmaengine_prep_slave_single(priv->dma_chan, priv->dma_handle, | |
104 | LEDS_TO_BYTES(length), DMA_MEM_TO_DEV, 0); | |
105 | if (!desc) | |
106 | return -ENOMEM; | |
107 | ||
108 | cookie = dmaengine_submit(desc); | |
109 | if (dma_submit_error(cookie)) | |
110 | return -EIO; | |
111 | ||
112 | dma_async_issue_pending(priv->dma_chan); | |
113 | ||
114 | return 0; | |
115 | } | |
116 | ||
117 | static void sun50i_a100_ledc_pio_xfer(struct sun50i_a100_ledc *priv, unsigned int fifo_used) | |
118 | { | |
119 | unsigned int burst, length, offset; | |
120 | u32 control; | |
121 | ||
122 | length = priv->pio_length; | |
123 | offset = priv->pio_offset; | |
124 | burst = min(length, LEDC_FIFO_DEPTH - fifo_used); | |
125 | ||
126 | iowrite32_rep(priv->base + LEDC_DATA_REG, priv->buffer + offset, burst); | |
127 | ||
128 | if (burst < length) { | |
129 | priv->pio_length = length - burst; | |
130 | priv->pio_offset = offset + burst; | |
131 | ||
132 | if (!offset) { | |
133 | control = readl(priv->base + LEDC_INT_CTRL_REG); | |
134 | control |= LEDC_INT_CTRL_REG_FIFO_CPUREQ_INT_EN; | |
135 | writel(control, priv->base + LEDC_INT_CTRL_REG); | |
136 | } | |
137 | } else { | |
138 | /* Disable the request IRQ once all data is written. */ | |
139 | control = readl(priv->base + LEDC_INT_CTRL_REG); | |
140 | control &= ~LEDC_INT_CTRL_REG_FIFO_CPUREQ_INT_EN; | |
141 | writel(control, priv->base + LEDC_INT_CTRL_REG); | |
142 | } | |
143 | } | |
144 | ||
145 | static void sun50i_a100_ledc_start_xfer(struct sun50i_a100_ledc *priv, unsigned int length) | |
146 | { | |
147 | bool use_dma = false; | |
148 | u32 control; | |
149 | ||
150 | if (priv->dma_chan && length > LEDC_FIFO_DEPTH) { | |
151 | int ret; | |
152 | ||
153 | ret = sun50i_a100_ledc_dma_xfer(priv, length); | |
154 | if (ret) | |
155 | dev_warn(priv->dev, "Failed to set up DMA (%d), using PIO\n", ret); | |
156 | else | |
157 | use_dma = true; | |
158 | } | |
159 | ||
160 | /* The DMA trigger level must be at least the burst length. */ | |
161 | control = FIELD_PREP(LEDC_DMA_CTRL_REG_DMA_EN, use_dma) | | |
162 | FIELD_PREP_CONST(LEDC_DMA_CTRL_REG_FIFO_TRIG_LEVEL, LEDC_FIFO_DEPTH / 2); | |
163 | writel(control, priv->base + LEDC_DMA_CTRL_REG); | |
164 | ||
165 | control = readl(priv->base + LEDC_CTRL_REG); | |
166 | control &= ~LEDC_CTRL_REG_DATA_LENGTH; | |
167 | control |= FIELD_PREP(LEDC_CTRL_REG_DATA_LENGTH, length) | LEDC_CTRL_REG_LEDC_EN; | |
168 | writel(control, priv->base + LEDC_CTRL_REG); | |
169 | ||
170 | if (!use_dma) { | |
171 | /* The FIFO is empty when starting a new transfer. */ | |
172 | unsigned int fifo_used = 0; | |
173 | ||
174 | priv->pio_length = length; | |
175 | priv->pio_offset = 0; | |
176 | ||
177 | sun50i_a100_ledc_pio_xfer(priv, fifo_used); | |
178 | } | |
179 | } | |
180 | ||
181 | static irqreturn_t sun50i_a100_ledc_irq(int irq, void *data) | |
182 | { | |
183 | struct sun50i_a100_ledc *priv = data; | |
184 | u32 status; | |
185 | ||
186 | status = readl(priv->base + LEDC_INT_STS_REG); | |
187 | ||
188 | if (status & LEDC_INT_STS_REG_TRANS_FINISH_INT) { | |
189 | unsigned int next_length; | |
190 | ||
191 | spin_lock(&priv->lock); | |
192 | ||
193 | /* If another transfer is queued, dequeue and start it. */ | |
194 | next_length = priv->next_length; | |
195 | if (next_length) | |
196 | priv->next_length = 0; | |
197 | else | |
198 | priv->xfer_active = false; | |
199 | ||
200 | spin_unlock(&priv->lock); | |
201 | ||
202 | if (next_length) | |
203 | sun50i_a100_ledc_start_xfer(priv, next_length); | |
204 | } else if (status & LEDC_INT_STS_REG_FIFO_CPUREQ_INT) { | |
205 | /* Continue the current transfer. */ | |
206 | sun50i_a100_ledc_pio_xfer(priv, FIELD_GET(LEDC_INT_STS_REG_FIFO_WLW, status)); | |
207 | } | |
208 | ||
209 | /* Clear the W1C status bits. */ | |
210 | writel(status, priv->base + LEDC_INT_STS_REG); | |
211 | ||
212 | return IRQ_HANDLED; | |
213 | } | |
214 | ||
215 | static void sun50i_a100_ledc_brightness_set(struct led_classdev *cdev, | |
216 | enum led_brightness brightness) | |
217 | { | |
218 | struct sun50i_a100_ledc *priv = dev_get_drvdata(cdev->dev->parent); | |
219 | struct led_classdev_mc *mc_cdev = lcdev_to_mccdev(cdev); | |
220 | struct sun50i_a100_ledc_led *led = to_ledc_led(mc_cdev); | |
221 | unsigned int next_length; | |
222 | unsigned long flags; | |
223 | bool xfer_active; | |
224 | ||
225 | led_mc_calc_color_components(mc_cdev, brightness); | |
226 | ||
227 | priv->buffer[led->addr] = led->subled_info[0].brightness << 16 | | |
228 | led->subled_info[1].brightness << 8 | | |
229 | led->subled_info[2].brightness; | |
230 | ||
231 | spin_lock_irqsave(&priv->lock, flags); | |
232 | ||
233 | /* Start, enqueue, or extend an enqueued transfer, as appropriate. */ | |
234 | next_length = max(priv->next_length, led->addr + 1); | |
235 | xfer_active = priv->xfer_active; | |
236 | if (xfer_active) | |
237 | priv->next_length = next_length; | |
238 | else | |
239 | priv->xfer_active = true; | |
240 | ||
241 | spin_unlock_irqrestore(&priv->lock, flags); | |
242 | ||
243 | if (!xfer_active) | |
244 | sun50i_a100_ledc_start_xfer(priv, next_length); | |
245 | } | |
246 | ||
247 | static const char *const sun50i_a100_ledc_formats[] = { | |
248 | "rgb", "rbg", "grb", "gbr", "brg", "bgr", | |
249 | }; | |
250 | ||
06c5206c | 251 | static int sun50i_a100_ledc_parse_format(struct device *dev, |
ec95a68d SH |
252 | struct sun50i_a100_ledc *priv) |
253 | { | |
254 | const char *format = "grb"; | |
3b29c7b9 | 255 | int i; |
ec95a68d | 256 | |
06c5206c | 257 | device_property_read_string(dev, "allwinner,pixel-format", &format); |
ec95a68d | 258 | |
3b29c7b9 AS |
259 | i = match_string(sun50i_a100_ledc_formats, ARRAY_SIZE(sun50i_a100_ledc_formats), format); |
260 | if (i < 0) | |
261 | return dev_err_probe(dev, i, "Bad pixel format '%s'\n", format); | |
ec95a68d | 262 | |
3b29c7b9 AS |
263 | priv->format = i; |
264 | return 0; | |
ec95a68d SH |
265 | } |
266 | ||
267 | static void sun50i_a100_ledc_set_format(struct sun50i_a100_ledc *priv) | |
268 | { | |
269 | u32 control; | |
270 | ||
271 | control = readl(priv->base + LEDC_CTRL_REG); | |
272 | control &= ~LEDC_CTRL_REG_RGB_MODE; | |
273 | control |= FIELD_PREP(LEDC_CTRL_REG_RGB_MODE, priv->format); | |
274 | writel(control, priv->base + LEDC_CTRL_REG); | |
275 | } | |
276 | ||
277 | static const struct sun50i_a100_ledc_timing sun50i_a100_ledc_default_timing = { | |
278 | .t0h_ns = 336, | |
279 | .t0l_ns = 840, | |
280 | .t1h_ns = 882, | |
281 | .t1l_ns = 294, | |
282 | .treset_ns = 300000, | |
283 | }; | |
284 | ||
06c5206c | 285 | static int sun50i_a100_ledc_parse_timing(struct device *dev, |
ec95a68d SH |
286 | struct sun50i_a100_ledc *priv) |
287 | { | |
288 | struct sun50i_a100_ledc_timing *timing = &priv->timing; | |
289 | ||
290 | *timing = sun50i_a100_ledc_default_timing; | |
291 | ||
06c5206c AS |
292 | device_property_read_u32(dev, "allwinner,t0h-ns", &timing->t0h_ns); |
293 | device_property_read_u32(dev, "allwinner,t0l-ns", &timing->t0l_ns); | |
294 | device_property_read_u32(dev, "allwinner,t1h-ns", &timing->t1h_ns); | |
295 | device_property_read_u32(dev, "allwinner,t1l-ns", &timing->t1l_ns); | |
296 | device_property_read_u32(dev, "allwinner,treset-ns", &timing->treset_ns); | |
ec95a68d SH |
297 | |
298 | return 0; | |
299 | } | |
300 | ||
301 | static void sun50i_a100_ledc_set_timing(struct sun50i_a100_ledc *priv) | |
302 | { | |
303 | const struct sun50i_a100_ledc_timing *timing = &priv->timing; | |
304 | unsigned long mod_freq = clk_get_rate(priv->mod_clk); | |
40cfa414 | 305 | u32 cycle_ns; |
ec95a68d SH |
306 | u32 control; |
307 | ||
40cfa414 AB |
308 | if (!mod_freq) |
309 | return; | |
310 | ||
311 | cycle_ns = NSEC_PER_SEC / mod_freq; | |
ec95a68d SH |
312 | control = FIELD_PREP(LEDC_T01_TIMING_CTRL_REG_T1H, timing->t1h_ns / cycle_ns) | |
313 | FIELD_PREP(LEDC_T01_TIMING_CTRL_REG_T1L, timing->t1l_ns / cycle_ns) | | |
314 | FIELD_PREP(LEDC_T01_TIMING_CTRL_REG_T0H, timing->t0h_ns / cycle_ns) | | |
315 | FIELD_PREP(LEDC_T01_TIMING_CTRL_REG_T0L, timing->t0l_ns / cycle_ns); | |
316 | writel(control, priv->base + LEDC_T01_TIMING_CTRL_REG); | |
317 | ||
318 | control = FIELD_PREP(LEDC_RESET_TIMING_CTRL_REG_TR, timing->treset_ns / cycle_ns) | | |
319 | FIELD_PREP(LEDC_RESET_TIMING_CTRL_REG_LED_NUM, priv->max_addr); | |
320 | writel(control, priv->base + LEDC_RESET_TIMING_CTRL_REG); | |
321 | } | |
322 | ||
323 | static int sun50i_a100_ledc_resume(struct device *dev) | |
324 | { | |
325 | struct sun50i_a100_ledc *priv = dev_get_drvdata(dev); | |
326 | int ret; | |
327 | ||
328 | ret = reset_control_deassert(priv->reset); | |
329 | if (ret) | |
330 | return ret; | |
331 | ||
332 | ret = clk_prepare_enable(priv->bus_clk); | |
333 | if (ret) | |
334 | goto err_assert_reset; | |
335 | ||
336 | ret = clk_prepare_enable(priv->mod_clk); | |
337 | if (ret) | |
338 | goto err_disable_bus_clk; | |
339 | ||
340 | sun50i_a100_ledc_set_format(priv); | |
341 | sun50i_a100_ledc_set_timing(priv); | |
342 | ||
343 | writel(LEDC_INT_CTRL_REG_GLOBAL_INT_EN | LEDC_INT_CTRL_REG_TRANS_FINISH_INT_EN, | |
344 | priv->base + LEDC_INT_CTRL_REG); | |
345 | ||
346 | return 0; | |
347 | ||
348 | err_disable_bus_clk: | |
349 | clk_disable_unprepare(priv->bus_clk); | |
350 | err_assert_reset: | |
351 | reset_control_assert(priv->reset); | |
352 | ||
353 | return ret; | |
354 | } | |
355 | ||
356 | static int sun50i_a100_ledc_suspend(struct device *dev) | |
357 | { | |
358 | struct sun50i_a100_ledc *priv = dev_get_drvdata(dev); | |
359 | ||
360 | /* Wait for all transfers to complete. */ | |
361 | for (;;) { | |
362 | unsigned long flags; | |
363 | bool xfer_active; | |
364 | ||
365 | spin_lock_irqsave(&priv->lock, flags); | |
366 | xfer_active = priv->xfer_active; | |
367 | spin_unlock_irqrestore(&priv->lock, flags); | |
368 | if (!xfer_active) | |
369 | break; | |
370 | ||
8f3f0751 | 371 | usleep_range(1000, 1100); |
ec95a68d SH |
372 | } |
373 | ||
374 | clk_disable_unprepare(priv->mod_clk); | |
375 | clk_disable_unprepare(priv->bus_clk); | |
376 | reset_control_assert(priv->reset); | |
377 | ||
378 | return 0; | |
379 | } | |
380 | ||
381 | static void sun50i_a100_ledc_dma_cleanup(void *data) | |
382 | { | |
383 | struct sun50i_a100_ledc *priv = data; | |
384 | ||
385 | dma_release_channel(priv->dma_chan); | |
386 | } | |
387 | ||
388 | static int sun50i_a100_ledc_probe(struct platform_device *pdev) | |
389 | { | |
ec95a68d SH |
390 | struct dma_slave_config dma_cfg = {}; |
391 | struct led_init_data init_data = {}; | |
392 | struct sun50i_a100_ledc_led *led; | |
393 | struct device *dev = &pdev->dev; | |
394 | struct sun50i_a100_ledc *priv; | |
06c5206c | 395 | struct fwnode_handle *child; |
ec95a68d SH |
396 | struct resource *mem; |
397 | u32 max_addr = 0; | |
398 | u32 num_leds = 0; | |
399 | int irq, ret; | |
400 | ||
401 | /* | |
402 | * The maximum LED address must be known in sun50i_a100_ledc_resume() before | |
403 | * class device registration, so parse and validate the subnodes up front. | |
404 | */ | |
06c5206c | 405 | device_for_each_child_node(dev, child) { |
ec95a68d SH |
406 | u32 addr, color; |
407 | ||
06c5206c | 408 | ret = fwnode_property_read_u32(child, "reg", &addr); |
ec95a68d | 409 | if (ret || addr >= LEDC_MAX_LEDS) { |
06c5206c | 410 | fwnode_handle_put(child); |
ec95a68d SH |
411 | return dev_err_probe(dev, -EINVAL, "'reg' must be between 0 and %d\n", |
412 | LEDC_MAX_LEDS - 1); | |
413 | } | |
414 | ||
06c5206c | 415 | ret = fwnode_property_read_u32(child, "color", &color); |
ec95a68d | 416 | if (ret || color != LED_COLOR_ID_RGB) { |
06c5206c | 417 | fwnode_handle_put(child); |
ec95a68d SH |
418 | return dev_err_probe(dev, -EINVAL, "'color' must be LED_COLOR_ID_RGB\n"); |
419 | } | |
420 | ||
421 | max_addr = max(max_addr, addr); | |
422 | num_leds++; | |
423 | } | |
424 | ||
425 | if (!num_leds) | |
426 | return -ENODEV; | |
427 | ||
428 | priv = devm_kzalloc(dev, struct_size(priv, leds, num_leds), GFP_KERNEL); | |
429 | if (!priv) | |
430 | return -ENOMEM; | |
431 | ||
432 | priv->dev = dev; | |
433 | priv->max_addr = max_addr; | |
434 | priv->num_leds = num_leds; | |
435 | spin_lock_init(&priv->lock); | |
436 | dev_set_drvdata(dev, priv); | |
437 | ||
06c5206c | 438 | ret = sun50i_a100_ledc_parse_format(dev, priv); |
ec95a68d SH |
439 | if (ret) |
440 | return ret; | |
441 | ||
06c5206c | 442 | ret = sun50i_a100_ledc_parse_timing(dev, priv); |
ec95a68d SH |
443 | if (ret) |
444 | return ret; | |
445 | ||
446 | priv->base = devm_platform_get_and_ioremap_resource(pdev, 0, &mem); | |
447 | if (IS_ERR(priv->base)) | |
448 | return PTR_ERR(priv->base); | |
449 | ||
450 | priv->bus_clk = devm_clk_get(dev, "bus"); | |
451 | if (IS_ERR(priv->bus_clk)) | |
452 | return PTR_ERR(priv->bus_clk); | |
453 | ||
454 | priv->mod_clk = devm_clk_get(dev, "mod"); | |
455 | if (IS_ERR(priv->mod_clk)) | |
456 | return PTR_ERR(priv->mod_clk); | |
457 | ||
458 | priv->reset = devm_reset_control_get_exclusive(dev, NULL); | |
459 | if (IS_ERR(priv->reset)) | |
460 | return PTR_ERR(priv->reset); | |
461 | ||
462 | priv->dma_chan = dma_request_chan(dev, "tx"); | |
463 | if (IS_ERR(priv->dma_chan)) { | |
464 | if (PTR_ERR(priv->dma_chan) != -ENODEV) | |
465 | return PTR_ERR(priv->dma_chan); | |
466 | ||
467 | priv->dma_chan = NULL; | |
468 | ||
469 | priv->buffer = devm_kzalloc(dev, LEDS_TO_BYTES(LEDC_MAX_LEDS), GFP_KERNEL); | |
470 | if (!priv->buffer) | |
471 | return -ENOMEM; | |
472 | } else { | |
473 | ret = devm_add_action_or_reset(dev, sun50i_a100_ledc_dma_cleanup, priv); | |
474 | if (ret) | |
475 | return ret; | |
476 | ||
477 | dma_cfg.dst_addr = mem->start + LEDC_DATA_REG; | |
478 | dma_cfg.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES; | |
479 | dma_cfg.dst_maxburst = LEDC_FIFO_DEPTH / 2; | |
480 | ||
481 | ret = dmaengine_slave_config(priv->dma_chan, &dma_cfg); | |
482 | if (ret) | |
483 | return ret; | |
484 | ||
485 | priv->buffer = dmam_alloc_attrs(dmaengine_get_dma_device(priv->dma_chan), | |
486 | LEDS_TO_BYTES(LEDC_MAX_LEDS), &priv->dma_handle, | |
487 | GFP_KERNEL, DMA_ATTR_WRITE_COMBINE); | |
488 | if (!priv->buffer) | |
489 | return -ENOMEM; | |
490 | } | |
491 | ||
492 | irq = platform_get_irq(pdev, 0); | |
493 | if (irq < 0) | |
494 | return irq; | |
495 | ||
496 | ret = devm_request_irq(dev, irq, sun50i_a100_ledc_irq, 0, dev_name(dev), priv); | |
497 | if (ret) | |
498 | return ret; | |
499 | ||
500 | ret = sun50i_a100_ledc_resume(dev); | |
501 | if (ret) | |
502 | return ret; | |
503 | ||
504 | led = priv->leds; | |
06c5206c | 505 | device_for_each_child_node(dev, child) { |
ec95a68d SH |
506 | struct led_classdev *cdev; |
507 | ||
508 | /* The node was already validated above. */ | |
06c5206c | 509 | fwnode_property_read_u32(child, "reg", &led->addr); |
ec95a68d SH |
510 | |
511 | led->subled_info[0].color_index = LED_COLOR_ID_RED; | |
512 | led->subled_info[0].channel = 0; | |
513 | led->subled_info[1].color_index = LED_COLOR_ID_GREEN; | |
514 | led->subled_info[1].channel = 1; | |
515 | led->subled_info[2].color_index = LED_COLOR_ID_BLUE; | |
516 | led->subled_info[2].channel = 2; | |
517 | ||
518 | led->mc_cdev.num_colors = ARRAY_SIZE(led->subled_info); | |
519 | led->mc_cdev.subled_info = led->subled_info; | |
520 | ||
521 | cdev = &led->mc_cdev.led_cdev; | |
522 | cdev->max_brightness = U8_MAX; | |
523 | cdev->brightness_set = sun50i_a100_ledc_brightness_set; | |
524 | ||
06c5206c | 525 | init_data.fwnode = child; |
ec95a68d SH |
526 | |
527 | ret = led_classdev_multicolor_register_ext(dev, &led->mc_cdev, &init_data); | |
528 | if (ret) { | |
529 | dev_err_probe(dev, ret, "Failed to register multicolor LED %u", led->addr); | |
530 | goto err_put_child; | |
531 | } | |
532 | ||
533 | led++; | |
534 | } | |
535 | ||
536 | dev_info(dev, "Registered %u LEDs\n", num_leds); | |
537 | ||
538 | return 0; | |
539 | ||
540 | err_put_child: | |
06c5206c | 541 | fwnode_handle_put(child); |
ec95a68d SH |
542 | while (led-- > priv->leds) |
543 | led_classdev_multicolor_unregister(&led->mc_cdev); | |
544 | sun50i_a100_ledc_suspend(&pdev->dev); | |
545 | ||
546 | return ret; | |
547 | } | |
548 | ||
549 | static void sun50i_a100_ledc_remove(struct platform_device *pdev) | |
550 | { | |
551 | struct sun50i_a100_ledc *priv = platform_get_drvdata(pdev); | |
552 | ||
553 | for (u32 i = 0; i < priv->num_leds; i++) | |
554 | led_classdev_multicolor_unregister(&priv->leds[i].mc_cdev); | |
555 | sun50i_a100_ledc_suspend(&pdev->dev); | |
556 | } | |
557 | ||
558 | static const struct of_device_id sun50i_a100_ledc_of_match[] = { | |
559 | { .compatible = "allwinner,sun50i-a100-ledc" }, | |
560 | {} | |
561 | }; | |
562 | MODULE_DEVICE_TABLE(of, sun50i_a100_ledc_of_match); | |
563 | ||
564 | static DEFINE_SIMPLE_DEV_PM_OPS(sun50i_a100_ledc_pm, | |
565 | sun50i_a100_ledc_suspend, | |
566 | sun50i_a100_ledc_resume); | |
567 | ||
568 | static struct platform_driver sun50i_a100_ledc_driver = { | |
569 | .probe = sun50i_a100_ledc_probe, | |
570 | .remove_new = sun50i_a100_ledc_remove, | |
571 | .shutdown = sun50i_a100_ledc_remove, | |
572 | .driver = { | |
573 | .name = "sun50i-a100-ledc", | |
574 | .of_match_table = sun50i_a100_ledc_of_match, | |
575 | .pm = pm_ptr(&sun50i_a100_ledc_pm), | |
576 | }, | |
577 | }; | |
578 | module_platform_driver(sun50i_a100_ledc_driver); | |
579 | ||
580 | MODULE_AUTHOR("Samuel Holland <samuel@sholland.org>"); | |
581 | MODULE_DESCRIPTION("Allwinner A100 LED controller driver"); | |
582 | MODULE_LICENSE("GPL"); |