1 | // SPDX-License-Identifier: GPL-2.0-only |
2 | /* |
3 | * Copyright 2007-2008 Extreme Engineering Solutions, Inc. |
4 | * |
5 | * Author: Nate Case <ncase@xes-inc.com> |
6 | * |
7 | * LED driver for various PCA955x I2C LED drivers |
8 | * |
9 | * Supported devices: |
10 | * |
11 | * Device Description 7-bit slave address |
12 | * ------ ----------- ------------------- |
13 | * PCA9550 2-bit driver 0x60 .. 0x61 |
14 | * PCA9551 8-bit driver 0x60 .. 0x67 |
15 | * PCA9552 16-bit driver 0x60 .. 0x67 |
16 | * PCA9553/01 4-bit driver 0x62 |
17 | * PCA9553/02 4-bit driver 0x63 |
18 | * |
19 | * Philips PCA955x LED driver chips follow a register map as shown below: |
20 | * |
21 | * Control Register Description |
22 | * ---------------- ----------- |
23 | * 0x0 Input register 0 |
24 | * .. |
25 | * NUM_INPUT_REGS - 1 Last Input register X |
26 | * |
27 | * NUM_INPUT_REGS Frequency prescaler 0 |
28 | * NUM_INPUT_REGS + 1 PWM register 0 |
29 | * NUM_INPUT_REGS + 2 Frequency prescaler 1 |
30 | * NUM_INPUT_REGS + 3 PWM register 1 |
31 | * |
32 | * NUM_INPUT_REGS + 4 LED selector 0 |
33 | * NUM_INPUT_REGS + 4 |
34 | * + NUM_LED_REGS - 1 Last LED selector |
35 | * |
36 | * where NUM_INPUT_REGS and NUM_LED_REGS vary depending on how many |
37 | * bits the chip supports. |
38 | */ |
39 | |
40 | #include <linux/bitops.h> |
41 | #include <linux/ctype.h> |
42 | #include <linux/delay.h> |
43 | #include <linux/err.h> |
44 | #include <linux/gpio/driver.h> |
45 | #include <linux/i2c.h> |
46 | #include <linux/leds.h> |
47 | #include <linux/module.h> |
48 | #include <linux/of.h> |
49 | #include <linux/property.h> |
50 | #include <linux/slab.h> |
51 | #include <linux/string.h> |
52 | |
53 | #include <dt-bindings/leds/leds-pca955x.h> |
54 | |
55 | /* LED select registers determine the source that drives LED outputs */ |
56 | #define PCA955X_LS_LED_ON 0x0 /* Output LOW */ |
57 | #define PCA955X_LS_LED_OFF 0x1 /* Output HI-Z */ |
58 | #define PCA955X_LS_BLINK0 0x2 /* Blink at PWM0 rate */ |
59 | #define PCA955X_LS_BLINK1 0x3 /* Blink at PWM1 rate */ |
60 | |
61 | #define PCA955X_GPIO_INPUT LED_OFF |
62 | #define PCA955X_GPIO_HIGH LED_OFF |
63 | #define PCA955X_GPIO_LOW LED_FULL |
64 | |
65 | enum pca955x_type { |
66 | pca9550, |
67 | pca9551, |
68 | pca9552, |
69 | ibm_pca9552, |
70 | pca9553, |
71 | }; |
72 | |
73 | struct pca955x_chipdef { |
74 | int bits; |
75 | u8 slv_addr; /* 7-bit slave address mask */ |
76 | int slv_addr_shift; /* Number of bits to ignore */ |
77 | }; |
78 | |
79 | static const struct pca955x_chipdef pca955x_chipdefs[] = { |
80 | [pca9550] = { |
81 | .bits = 2, |
82 | .slv_addr = /* 110000x */ 0x60, |
83 | .slv_addr_shift = 1, |
84 | }, |
85 | [pca9551] = { |
86 | .bits = 8, |
87 | .slv_addr = /* 1100xxx */ 0x60, |
88 | .slv_addr_shift = 3, |
89 | }, |
90 | [pca9552] = { |
91 | .bits = 16, |
92 | .slv_addr = /* 1100xxx */ 0x60, |
93 | .slv_addr_shift = 3, |
94 | }, |
95 | [ibm_pca9552] = { |
96 | .bits = 16, |
97 | .slv_addr = /* 0110xxx */ 0x30, |
98 | .slv_addr_shift = 3, |
99 | }, |
100 | [pca9553] = { |
101 | .bits = 4, |
102 | .slv_addr = /* 110001x */ 0x62, |
103 | .slv_addr_shift = 1, |
104 | }, |
105 | }; |
106 | |
107 | struct pca955x { |
108 | struct mutex lock; |
109 | struct pca955x_led *leds; |
110 | const struct pca955x_chipdef *chipdef; |
111 | struct i2c_client *client; |
112 | unsigned long active_pins; |
113 | #ifdef CONFIG_LEDS_PCA955X_GPIO |
114 | struct gpio_chip gpio; |
115 | #endif |
116 | }; |
117 | |
118 | struct pca955x_led { |
119 | struct pca955x *pca955x; |
120 | struct led_classdev led_cdev; |
121 | int led_num; /* 0 .. 15 potentially */ |
122 | u32 type; |
123 | enum led_default_state default_state; |
124 | struct fwnode_handle *fwnode; |
125 | }; |
126 | |
127 | struct pca955x_platform_data { |
128 | struct pca955x_led *leds; |
129 | int num_leds; |
130 | }; |
131 | |
132 | /* 8 bits per input register */ |
133 | static inline int pca95xx_num_input_regs(int bits) |
134 | { |
135 | return (bits + 7) / 8; |
136 | } |
137 | |
138 | /* |
139 | * Return an LED selector register value based on an existing one, with |
140 | * the appropriate 2-bit state value set for the given LED number (0-3). |
141 | */ |
142 | static inline u8 pca955x_ledsel(u8 oldval, int led_num, int state) |
143 | { |
144 | return (oldval & (~(0x3 << (led_num << 1)))) | |
145 | ((state & 0x3) << (led_num << 1)); |
146 | } |
147 | |
148 | /* |
149 | * Write to frequency prescaler register, used to program the |
150 | * period of the PWM output. period = (PSCx + 1) / 38 |
151 | */ |
152 | static int pca955x_write_psc(struct i2c_client *client, int n, u8 val) |
153 | { |
154 | struct pca955x *pca955x = i2c_get_clientdata(client); |
155 | u8 cmd = pca95xx_num_input_regs(bits: pca955x->chipdef->bits) + (2 * n); |
156 | int ret; |
157 | |
158 | ret = i2c_smbus_write_byte_data(client, command: cmd, value: val); |
159 | if (ret < 0) |
160 | dev_err(&client->dev, "%s: reg 0x%x, val 0x%x, err %d\n" , |
161 | __func__, n, val, ret); |
162 | return ret; |
163 | } |
164 | |
165 | /* |
166 | * Write to PWM register, which determines the duty cycle of the |
167 | * output. LED is OFF when the count is less than the value of this |
168 | * register, and ON when it is greater. If PWMx == 0, LED is always OFF. |
169 | * |
170 | * Duty cycle is (256 - PWMx) / 256 |
171 | */ |
172 | static int pca955x_write_pwm(struct i2c_client *client, int n, u8 val) |
173 | { |
174 | struct pca955x *pca955x = i2c_get_clientdata(client); |
175 | u8 cmd = pca95xx_num_input_regs(bits: pca955x->chipdef->bits) + 1 + (2 * n); |
176 | int ret; |
177 | |
178 | ret = i2c_smbus_write_byte_data(client, command: cmd, value: val); |
179 | if (ret < 0) |
180 | dev_err(&client->dev, "%s: reg 0x%x, val 0x%x, err %d\n" , |
181 | __func__, n, val, ret); |
182 | return ret; |
183 | } |
184 | |
185 | /* |
186 | * Write to LED selector register, which determines the source that |
187 | * drives the LED output. |
188 | */ |
189 | static int pca955x_write_ls(struct i2c_client *client, int n, u8 val) |
190 | { |
191 | struct pca955x *pca955x = i2c_get_clientdata(client); |
192 | u8 cmd = pca95xx_num_input_regs(bits: pca955x->chipdef->bits) + 4 + n; |
193 | int ret; |
194 | |
195 | ret = i2c_smbus_write_byte_data(client, command: cmd, value: val); |
196 | if (ret < 0) |
197 | dev_err(&client->dev, "%s: reg 0x%x, val 0x%x, err %d\n" , |
198 | __func__, n, val, ret); |
199 | return ret; |
200 | } |
201 | |
202 | /* |
203 | * Read the LED selector register, which determines the source that |
204 | * drives the LED output. |
205 | */ |
206 | static int pca955x_read_ls(struct i2c_client *client, int n, u8 *val) |
207 | { |
208 | struct pca955x *pca955x = i2c_get_clientdata(client); |
209 | u8 cmd = pca95xx_num_input_regs(bits: pca955x->chipdef->bits) + 4 + n; |
210 | int ret; |
211 | |
212 | ret = i2c_smbus_read_byte_data(client, command: cmd); |
213 | if (ret < 0) { |
214 | dev_err(&client->dev, "%s: reg 0x%x, err %d\n" , |
215 | __func__, n, ret); |
216 | return ret; |
217 | } |
218 | *val = (u8)ret; |
219 | return 0; |
220 | } |
221 | |
222 | static int pca955x_read_pwm(struct i2c_client *client, int n, u8 *val) |
223 | { |
224 | struct pca955x *pca955x = i2c_get_clientdata(client); |
225 | u8 cmd = pca95xx_num_input_regs(bits: pca955x->chipdef->bits) + 1 + (2 * n); |
226 | int ret; |
227 | |
228 | ret = i2c_smbus_read_byte_data(client, command: cmd); |
229 | if (ret < 0) { |
230 | dev_err(&client->dev, "%s: reg 0x%x, err %d\n" , |
231 | __func__, n, ret); |
232 | return ret; |
233 | } |
234 | *val = (u8)ret; |
235 | return 0; |
236 | } |
237 | |
238 | static enum led_brightness pca955x_led_get(struct led_classdev *led_cdev) |
239 | { |
240 | struct pca955x_led *pca955x_led = container_of(led_cdev, |
241 | struct pca955x_led, |
242 | led_cdev); |
243 | struct pca955x *pca955x = pca955x_led->pca955x; |
244 | u8 ls, pwm; |
245 | int ret; |
246 | |
247 | ret = pca955x_read_ls(client: pca955x->client, n: pca955x_led->led_num / 4, val: &ls); |
248 | if (ret) |
249 | return ret; |
250 | |
251 | ls = (ls >> ((pca955x_led->led_num % 4) << 1)) & 0x3; |
252 | switch (ls) { |
253 | case PCA955X_LS_LED_ON: |
254 | ret = LED_FULL; |
255 | break; |
256 | case PCA955X_LS_LED_OFF: |
257 | ret = LED_OFF; |
258 | break; |
259 | case PCA955X_LS_BLINK0: |
260 | ret = LED_HALF; |
261 | break; |
262 | case PCA955X_LS_BLINK1: |
263 | ret = pca955x_read_pwm(client: pca955x->client, n: 1, val: &pwm); |
264 | if (ret) |
265 | return ret; |
266 | ret = 255 - pwm; |
267 | break; |
268 | } |
269 | |
270 | return ret; |
271 | } |
272 | |
273 | static int pca955x_led_set(struct led_classdev *led_cdev, |
274 | enum led_brightness value) |
275 | { |
276 | struct pca955x_led *pca955x_led; |
277 | struct pca955x *pca955x; |
278 | u8 ls; |
279 | int chip_ls; /* which LSx to use (0-3 potentially) */ |
280 | int ls_led; /* which set of bits within LSx to use (0-3) */ |
281 | int ret; |
282 | |
283 | pca955x_led = container_of(led_cdev, struct pca955x_led, led_cdev); |
284 | pca955x = pca955x_led->pca955x; |
285 | |
286 | chip_ls = pca955x_led->led_num / 4; |
287 | ls_led = pca955x_led->led_num % 4; |
288 | |
289 | mutex_lock(&pca955x->lock); |
290 | |
291 | ret = pca955x_read_ls(client: pca955x->client, n: chip_ls, val: &ls); |
292 | if (ret) |
293 | goto out; |
294 | |
295 | switch (value) { |
296 | case LED_FULL: |
297 | ls = pca955x_ledsel(oldval: ls, led_num: ls_led, PCA955X_LS_LED_ON); |
298 | break; |
299 | case LED_OFF: |
300 | ls = pca955x_ledsel(oldval: ls, led_num: ls_led, PCA955X_LS_LED_OFF); |
301 | break; |
302 | case LED_HALF: |
303 | ls = pca955x_ledsel(oldval: ls, led_num: ls_led, PCA955X_LS_BLINK0); |
304 | break; |
305 | default: |
306 | /* |
307 | * Use PWM1 for all other values. This has the unwanted |
308 | * side effect of making all LEDs on the chip share the |
309 | * same brightness level if set to a value other than |
310 | * OFF, HALF, or FULL. But, this is probably better than |
311 | * just turning off for all other values. |
312 | */ |
313 | ret = pca955x_write_pwm(client: pca955x->client, n: 1, val: 255 - value); |
314 | if (ret) |
315 | goto out; |
316 | ls = pca955x_ledsel(oldval: ls, led_num: ls_led, PCA955X_LS_BLINK1); |
317 | break; |
318 | } |
319 | |
320 | ret = pca955x_write_ls(client: pca955x->client, n: chip_ls, val: ls); |
321 | |
322 | out: |
323 | mutex_unlock(lock: &pca955x->lock); |
324 | |
325 | return ret; |
326 | } |
327 | |
328 | #ifdef CONFIG_LEDS_PCA955X_GPIO |
329 | /* |
330 | * Read the INPUT register, which contains the state of LEDs. |
331 | */ |
332 | static int pca955x_read_input(struct i2c_client *client, int n, u8 *val) |
333 | { |
334 | int ret = i2c_smbus_read_byte_data(client, command: n); |
335 | |
336 | if (ret < 0) { |
337 | dev_err(&client->dev, "%s: reg 0x%x, err %d\n" , |
338 | __func__, n, ret); |
339 | return ret; |
340 | } |
341 | *val = (u8)ret; |
342 | return 0; |
343 | |
344 | } |
345 | |
346 | static int pca955x_gpio_request_pin(struct gpio_chip *gc, unsigned int offset) |
347 | { |
348 | struct pca955x *pca955x = gpiochip_get_data(gc); |
349 | |
350 | return test_and_set_bit(nr: offset, addr: &pca955x->active_pins) ? -EBUSY : 0; |
351 | } |
352 | |
353 | static void pca955x_gpio_free_pin(struct gpio_chip *gc, unsigned int offset) |
354 | { |
355 | struct pca955x *pca955x = gpiochip_get_data(gc); |
356 | |
357 | clear_bit(nr: offset, addr: &pca955x->active_pins); |
358 | } |
359 | |
360 | static int pca955x_set_value(struct gpio_chip *gc, unsigned int offset, |
361 | int val) |
362 | { |
363 | struct pca955x *pca955x = gpiochip_get_data(gc); |
364 | struct pca955x_led *led = &pca955x->leds[offset]; |
365 | |
366 | if (val) |
367 | return pca955x_led_set(led_cdev: &led->led_cdev, PCA955X_GPIO_HIGH); |
368 | |
369 | return pca955x_led_set(led_cdev: &led->led_cdev, PCA955X_GPIO_LOW); |
370 | } |
371 | |
372 | static void pca955x_gpio_set_value(struct gpio_chip *gc, unsigned int offset, |
373 | int val) |
374 | { |
375 | pca955x_set_value(gc, offset, val); |
376 | } |
377 | |
378 | static int pca955x_gpio_get_value(struct gpio_chip *gc, unsigned int offset) |
379 | { |
380 | struct pca955x *pca955x = gpiochip_get_data(gc); |
381 | struct pca955x_led *led = &pca955x->leds[offset]; |
382 | u8 reg = 0; |
383 | |
384 | /* There is nothing we can do about errors */ |
385 | pca955x_read_input(client: pca955x->client, n: led->led_num / 8, val: ®); |
386 | |
387 | return !!(reg & (1 << (led->led_num % 8))); |
388 | } |
389 | |
390 | static int pca955x_gpio_direction_input(struct gpio_chip *gc, |
391 | unsigned int offset) |
392 | { |
393 | struct pca955x *pca955x = gpiochip_get_data(gc); |
394 | struct pca955x_led *led = &pca955x->leds[offset]; |
395 | |
396 | /* To use as input ensure pin is not driven. */ |
397 | return pca955x_led_set(led_cdev: &led->led_cdev, PCA955X_GPIO_INPUT); |
398 | } |
399 | |
400 | static int pca955x_gpio_direction_output(struct gpio_chip *gc, |
401 | unsigned int offset, int val) |
402 | { |
403 | return pca955x_set_value(gc, offset, val); |
404 | } |
405 | #endif /* CONFIG_LEDS_PCA955X_GPIO */ |
406 | |
407 | static struct pca955x_platform_data * |
408 | pca955x_get_pdata(struct i2c_client *client, const struct pca955x_chipdef *chip) |
409 | { |
410 | struct pca955x_platform_data *pdata; |
411 | struct pca955x_led *led; |
412 | struct fwnode_handle *child; |
413 | int count; |
414 | |
415 | count = device_get_child_node_count(dev: &client->dev); |
416 | if (count > chip->bits) |
417 | return ERR_PTR(error: -ENODEV); |
418 | |
419 | pdata = devm_kzalloc(dev: &client->dev, size: sizeof(*pdata), GFP_KERNEL); |
420 | if (!pdata) |
421 | return ERR_PTR(error: -ENOMEM); |
422 | |
423 | pdata->leds = devm_kcalloc(dev: &client->dev, |
424 | n: chip->bits, size: sizeof(struct pca955x_led), |
425 | GFP_KERNEL); |
426 | if (!pdata->leds) |
427 | return ERR_PTR(error: -ENOMEM); |
428 | |
429 | device_for_each_child_node(&client->dev, child) { |
430 | u32 reg; |
431 | int res; |
432 | |
433 | res = fwnode_property_read_u32(fwnode: child, propname: "reg" , val: ®); |
434 | if ((res != 0) || (reg >= chip->bits)) |
435 | continue; |
436 | |
437 | led = &pdata->leds[reg]; |
438 | led->type = PCA955X_TYPE_LED; |
439 | led->fwnode = child; |
440 | led->default_state = led_init_default_state_get(fwnode: child); |
441 | |
442 | fwnode_property_read_u32(fwnode: child, propname: "type" , val: &led->type); |
443 | } |
444 | |
445 | pdata->num_leds = chip->bits; |
446 | |
447 | return pdata; |
448 | } |
449 | |
450 | static int pca955x_probe(struct i2c_client *client) |
451 | { |
452 | struct pca955x *pca955x; |
453 | struct pca955x_led *pca955x_led; |
454 | const struct pca955x_chipdef *chip; |
455 | struct led_classdev *led; |
456 | struct led_init_data init_data; |
457 | struct i2c_adapter *adapter; |
458 | int i, err; |
459 | struct pca955x_platform_data *pdata; |
460 | bool set_default_label = false; |
461 | bool keep_pwm = false; |
462 | char default_label[8]; |
463 | |
464 | chip = i2c_get_match_data(client); |
465 | if (!chip) |
466 | return dev_err_probe(dev: &client->dev, err: -ENODEV, fmt: "unknown chip\n" ); |
467 | |
468 | adapter = client->adapter; |
469 | pdata = dev_get_platdata(dev: &client->dev); |
470 | if (!pdata) { |
471 | pdata = pca955x_get_pdata(client, chip); |
472 | if (IS_ERR(ptr: pdata)) |
473 | return PTR_ERR(ptr: pdata); |
474 | } |
475 | |
476 | /* Make sure the slave address / chip type combo given is possible */ |
477 | if ((client->addr & ~((1 << chip->slv_addr_shift) - 1)) != |
478 | chip->slv_addr) { |
479 | dev_err(&client->dev, "invalid slave address %02x\n" , |
480 | client->addr); |
481 | return -ENODEV; |
482 | } |
483 | |
484 | dev_info(&client->dev, "leds-pca955x: Using %s %d-bit LED driver at " |
485 | "slave address 0x%02x\n" , client->name, chip->bits, |
486 | client->addr); |
487 | |
488 | if (!i2c_check_functionality(adap: adapter, I2C_FUNC_SMBUS_BYTE_DATA)) |
489 | return -EIO; |
490 | |
491 | if (pdata->num_leds != chip->bits) { |
492 | dev_err(&client->dev, |
493 | "board info claims %d LEDs on a %d-bit chip\n" , |
494 | pdata->num_leds, chip->bits); |
495 | return -ENODEV; |
496 | } |
497 | |
498 | pca955x = devm_kzalloc(dev: &client->dev, size: sizeof(*pca955x), GFP_KERNEL); |
499 | if (!pca955x) |
500 | return -ENOMEM; |
501 | |
502 | pca955x->leds = devm_kcalloc(dev: &client->dev, n: chip->bits, |
503 | size: sizeof(*pca955x_led), GFP_KERNEL); |
504 | if (!pca955x->leds) |
505 | return -ENOMEM; |
506 | |
507 | i2c_set_clientdata(client, data: pca955x); |
508 | |
509 | mutex_init(&pca955x->lock); |
510 | pca955x->client = client; |
511 | pca955x->chipdef = chip; |
512 | |
513 | init_data.devname_mandatory = false; |
514 | init_data.devicename = "pca955x" ; |
515 | |
516 | for (i = 0; i < chip->bits; i++) { |
517 | pca955x_led = &pca955x->leds[i]; |
518 | pca955x_led->led_num = i; |
519 | pca955x_led->pca955x = pca955x; |
520 | pca955x_led->type = pdata->leds[i].type; |
521 | |
522 | switch (pca955x_led->type) { |
523 | case PCA955X_TYPE_NONE: |
524 | case PCA955X_TYPE_GPIO: |
525 | break; |
526 | case PCA955X_TYPE_LED: |
527 | led = &pca955x_led->led_cdev; |
528 | led->brightness_set_blocking = pca955x_led_set; |
529 | led->brightness_get = pca955x_led_get; |
530 | |
531 | if (pdata->leds[i].default_state == LEDS_DEFSTATE_OFF) { |
532 | err = pca955x_led_set(led_cdev: led, value: LED_OFF); |
533 | if (err) |
534 | return err; |
535 | } else if (pdata->leds[i].default_state == LEDS_DEFSTATE_ON) { |
536 | err = pca955x_led_set(led_cdev: led, value: LED_FULL); |
537 | if (err) |
538 | return err; |
539 | } |
540 | |
541 | init_data.fwnode = pdata->leds[i].fwnode; |
542 | |
543 | if (is_of_node(fwnode: init_data.fwnode)) { |
544 | if (to_of_node(init_data.fwnode)->name[0] == |
545 | '\0') |
546 | set_default_label = true; |
547 | else |
548 | set_default_label = false; |
549 | } else { |
550 | set_default_label = true; |
551 | } |
552 | |
553 | if (set_default_label) { |
554 | snprintf(buf: default_label, size: sizeof(default_label), |
555 | fmt: "%d" , i); |
556 | init_data.default_label = default_label; |
557 | } else { |
558 | init_data.default_label = NULL; |
559 | } |
560 | |
561 | err = devm_led_classdev_register_ext(parent: &client->dev, led_cdev: led, |
562 | init_data: &init_data); |
563 | if (err) |
564 | return err; |
565 | |
566 | set_bit(nr: i, addr: &pca955x->active_pins); |
567 | |
568 | /* |
569 | * For default-state == "keep", let the core update the |
570 | * brightness from the hardware, then check the |
571 | * brightness to see if it's using PWM1. If so, PWM1 |
572 | * should not be written below. |
573 | */ |
574 | if (pdata->leds[i].default_state == LEDS_DEFSTATE_KEEP) { |
575 | if (led->brightness != LED_FULL && |
576 | led->brightness != LED_OFF && |
577 | led->brightness != LED_HALF) |
578 | keep_pwm = true; |
579 | } |
580 | } |
581 | } |
582 | |
583 | /* PWM0 is used for half brightness or 50% duty cycle */ |
584 | err = pca955x_write_pwm(client, n: 0, val: 255 - LED_HALF); |
585 | if (err) |
586 | return err; |
587 | |
588 | if (!keep_pwm) { |
589 | /* PWM1 is used for variable brightness, default to OFF */ |
590 | err = pca955x_write_pwm(client, n: 1, val: 0); |
591 | if (err) |
592 | return err; |
593 | } |
594 | |
595 | /* Set to fast frequency so we do not see flashing */ |
596 | err = pca955x_write_psc(client, n: 0, val: 0); |
597 | if (err) |
598 | return err; |
599 | err = pca955x_write_psc(client, n: 1, val: 0); |
600 | if (err) |
601 | return err; |
602 | |
603 | #ifdef CONFIG_LEDS_PCA955X_GPIO |
604 | pca955x->gpio.label = "gpio-pca955x" ; |
605 | pca955x->gpio.direction_input = pca955x_gpio_direction_input; |
606 | pca955x->gpio.direction_output = pca955x_gpio_direction_output; |
607 | pca955x->gpio.set = pca955x_gpio_set_value; |
608 | pca955x->gpio.get = pca955x_gpio_get_value; |
609 | pca955x->gpio.request = pca955x_gpio_request_pin; |
610 | pca955x->gpio.free = pca955x_gpio_free_pin; |
611 | pca955x->gpio.can_sleep = 1; |
612 | pca955x->gpio.base = -1; |
613 | pca955x->gpio.ngpio = chip->bits; |
614 | pca955x->gpio.parent = &client->dev; |
615 | pca955x->gpio.owner = THIS_MODULE; |
616 | |
617 | err = devm_gpiochip_add_data(&client->dev, &pca955x->gpio, |
618 | pca955x); |
619 | if (err) { |
620 | /* Use data->gpio.dev as a flag for freeing gpiochip */ |
621 | pca955x->gpio.parent = NULL; |
622 | dev_warn(&client->dev, "could not add gpiochip\n" ); |
623 | return err; |
624 | } |
625 | dev_info(&client->dev, "gpios %i...%i\n" , |
626 | pca955x->gpio.base, pca955x->gpio.base + |
627 | pca955x->gpio.ngpio - 1); |
628 | #endif |
629 | |
630 | return 0; |
631 | } |
632 | |
633 | static const struct i2c_device_id pca955x_id[] = { |
634 | { "pca9550" , (kernel_ulong_t)&pca955x_chipdefs[pca9550] }, |
635 | { "pca9551" , (kernel_ulong_t)&pca955x_chipdefs[pca9551] }, |
636 | { "pca9552" , (kernel_ulong_t)&pca955x_chipdefs[pca9552] }, |
637 | { "ibm-pca9552" , (kernel_ulong_t)&pca955x_chipdefs[ibm_pca9552] }, |
638 | { "pca9553" , (kernel_ulong_t)&pca955x_chipdefs[pca9553] }, |
639 | {} |
640 | }; |
641 | MODULE_DEVICE_TABLE(i2c, pca955x_id); |
642 | |
643 | static const struct of_device_id of_pca955x_match[] = { |
644 | { .compatible = "nxp,pca9550" , .data = &pca955x_chipdefs[pca9550] }, |
645 | { .compatible = "nxp,pca9551" , .data = &pca955x_chipdefs[pca9551] }, |
646 | { .compatible = "nxp,pca9552" , .data = &pca955x_chipdefs[pca9552] }, |
647 | { .compatible = "ibm,pca9552" , .data = &pca955x_chipdefs[ibm_pca9552] }, |
648 | { .compatible = "nxp,pca9553" , .data = &pca955x_chipdefs[pca9553] }, |
649 | {} |
650 | }; |
651 | MODULE_DEVICE_TABLE(of, of_pca955x_match); |
652 | |
653 | static struct i2c_driver pca955x_driver = { |
654 | .driver = { |
655 | .name = "leds-pca955x" , |
656 | .of_match_table = of_pca955x_match, |
657 | }, |
658 | .probe = pca955x_probe, |
659 | .id_table = pca955x_id, |
660 | }; |
661 | |
662 | module_i2c_driver(pca955x_driver); |
663 | |
664 | MODULE_AUTHOR("Nate Case <ncase@xes-inc.com>" ); |
665 | MODULE_DESCRIPTION("PCA955x LED driver" ); |
666 | MODULE_LICENSE("GPL v2" ); |
667 | |