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36edc939 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
f46e9203 NC |
2 | /* |
3 | * Copyright 2007-2008 Extreme Engineering Solutions, Inc. | |
4 | * | |
5 | * Author: Nate Case <ncase@xes-inc.com> | |
6 | * | |
f46e9203 NC |
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 | ||
ca386253 | 40 | #include <linux/bitops.h> |
f46e9203 | 41 | #include <linux/ctype.h> |
ed1f4b96 | 42 | #include <linux/delay.h> |
f46e9203 | 43 | #include <linux/err.h> |
0987c7df | 44 | #include <linux/gpio/driver.h> |
f46e9203 | 45 | #include <linux/i2c.h> |
ed1f4b96 CLG |
46 | #include <linux/leds.h> |
47 | #include <linux/module.h> | |
ed1f4b96 | 48 | #include <linux/of.h> |
967f69de | 49 | #include <linux/property.h> |
5a0e3ad6 | 50 | #include <linux/slab.h> |
ed1f4b96 | 51 | #include <linux/string.h> |
f46e9203 | 52 | |
561099a1 CLG |
53 | #include <dt-bindings/leds/leds-pca955x.h> |
54 | ||
f46e9203 NC |
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 | ||
52ca7d0f AJ |
61 | #define PCA955X_GPIO_INPUT LED_OFF |
62 | #define PCA955X_GPIO_HIGH LED_OFF | |
63 | #define PCA955X_GPIO_LOW LED_FULL | |
64 | ||
f46e9203 NC |
65 | enum pca955x_type { |
66 | pca9550, | |
67 | pca9551, | |
68 | pca9552, | |
46de3adb | 69 | ibm_pca9552, |
f46e9203 NC |
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 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 | }, | |
46de3adb EJ |
95 | [ibm_pca9552] = { |
96 | .bits = 16, | |
97 | .slv_addr = /* 0110xxx */ 0x30, | |
98 | .slv_addr_shift = 3, | |
99 | }, | |
f46e9203 NC |
100 | [pca9553] = { |
101 | .bits = 4, | |
102 | .slv_addr = /* 110001x */ 0x62, | |
103 | .slv_addr_shift = 1, | |
104 | }, | |
105 | }; | |
106 | ||
107 | static const struct i2c_device_id pca955x_id[] = { | |
108 | { "pca9550", pca9550 }, | |
109 | { "pca9551", pca9551 }, | |
110 | { "pca9552", pca9552 }, | |
46de3adb | 111 | { "ibm-pca9552", ibm_pca9552 }, |
f46e9203 NC |
112 | { "pca9553", pca9553 }, |
113 | { } | |
114 | }; | |
115 | MODULE_DEVICE_TABLE(i2c, pca955x_id); | |
116 | ||
e7e11d8b AS |
117 | struct pca955x { |
118 | struct mutex lock; | |
119 | struct pca955x_led *leds; | |
f46e9203 NC |
120 | struct pca955x_chipdef *chipdef; |
121 | struct i2c_client *client; | |
ca386253 | 122 | unsigned long active_pins; |
561099a1 CLG |
123 | #ifdef CONFIG_LEDS_PCA955X_GPIO |
124 | struct gpio_chip gpio; | |
125 | #endif | |
e7e11d8b AS |
126 | }; |
127 | ||
128 | struct pca955x_led { | |
129 | struct pca955x *pca955x; | |
f46e9203 NC |
130 | struct led_classdev led_cdev; |
131 | int led_num; /* 0 .. 15 potentially */ | |
561099a1 | 132 | u32 type; |
0dd37b1c | 133 | enum led_default_state default_state; |
7c481592 | 134 | struct fwnode_handle *fwnode; |
ed1f4b96 CLG |
135 | }; |
136 | ||
137 | struct pca955x_platform_data { | |
138 | struct pca955x_led *leds; | |
139 | int num_leds; | |
f46e9203 NC |
140 | }; |
141 | ||
142 | /* 8 bits per input register */ | |
143 | static inline int pca95xx_num_input_regs(int bits) | |
144 | { | |
145 | return (bits + 7) / 8; | |
146 | } | |
147 | ||
f46e9203 NC |
148 | /* |
149 | * Return an LED selector register value based on an existing one, with | |
150 | * the appropriate 2-bit state value set for the given LED number (0-3). | |
151 | */ | |
152 | static inline u8 pca955x_ledsel(u8 oldval, int led_num, int state) | |
153 | { | |
154 | return (oldval & (~(0x3 << (led_num << 1)))) | | |
155 | ((state & 0x3) << (led_num << 1)); | |
156 | } | |
157 | ||
158 | /* | |
159 | * Write to frequency prescaler register, used to program the | |
160 | * period of the PWM output. period = (PSCx + 1) / 38 | |
161 | */ | |
1591caf2 | 162 | static int pca955x_write_psc(struct i2c_client *client, int n, u8 val) |
f46e9203 | 163 | { |
e7e11d8b | 164 | struct pca955x *pca955x = i2c_get_clientdata(client); |
2420ae02 | 165 | u8 cmd = pca95xx_num_input_regs(pca955x->chipdef->bits) + (2 * n); |
1591caf2 | 166 | int ret; |
f46e9203 | 167 | |
2420ae02 | 168 | ret = i2c_smbus_write_byte_data(client, cmd, val); |
1591caf2 CLG |
169 | if (ret < 0) |
170 | dev_err(&client->dev, "%s: reg 0x%x, val 0x%x, err %d\n", | |
171 | __func__, n, val, ret); | |
172 | return ret; | |
f46e9203 NC |
173 | } |
174 | ||
175 | /* | |
176 | * Write to PWM register, which determines the duty cycle of the | |
177 | * output. LED is OFF when the count is less than the value of this | |
178 | * register, and ON when it is greater. If PWMx == 0, LED is always OFF. | |
179 | * | |
180 | * Duty cycle is (256 - PWMx) / 256 | |
181 | */ | |
1591caf2 | 182 | static int pca955x_write_pwm(struct i2c_client *client, int n, u8 val) |
f46e9203 | 183 | { |
e7e11d8b | 184 | struct pca955x *pca955x = i2c_get_clientdata(client); |
2420ae02 | 185 | u8 cmd = pca95xx_num_input_regs(pca955x->chipdef->bits) + 1 + (2 * n); |
1591caf2 | 186 | int ret; |
f46e9203 | 187 | |
2420ae02 | 188 | ret = i2c_smbus_write_byte_data(client, cmd, val); |
1591caf2 CLG |
189 | if (ret < 0) |
190 | dev_err(&client->dev, "%s: reg 0x%x, val 0x%x, err %d\n", | |
191 | __func__, n, val, ret); | |
192 | return ret; | |
f46e9203 NC |
193 | } |
194 | ||
195 | /* | |
196 | * Write to LED selector register, which determines the source that | |
197 | * drives the LED output. | |
198 | */ | |
1591caf2 | 199 | static int pca955x_write_ls(struct i2c_client *client, int n, u8 val) |
f46e9203 | 200 | { |
e7e11d8b | 201 | struct pca955x *pca955x = i2c_get_clientdata(client); |
2420ae02 | 202 | u8 cmd = pca95xx_num_input_regs(pca955x->chipdef->bits) + 4 + n; |
1591caf2 | 203 | int ret; |
f46e9203 | 204 | |
2420ae02 | 205 | ret = i2c_smbus_write_byte_data(client, cmd, val); |
1591caf2 CLG |
206 | if (ret < 0) |
207 | dev_err(&client->dev, "%s: reg 0x%x, val 0x%x, err %d\n", | |
208 | __func__, n, val, ret); | |
209 | return ret; | |
f46e9203 NC |
210 | } |
211 | ||
212 | /* | |
213 | * Read the LED selector register, which determines the source that | |
214 | * drives the LED output. | |
215 | */ | |
1591caf2 | 216 | static int pca955x_read_ls(struct i2c_client *client, int n, u8 *val) |
f46e9203 | 217 | { |
e7e11d8b | 218 | struct pca955x *pca955x = i2c_get_clientdata(client); |
2420ae02 | 219 | u8 cmd = pca95xx_num_input_regs(pca955x->chipdef->bits) + 4 + n; |
1591caf2 | 220 | int ret; |
f46e9203 | 221 | |
2420ae02 | 222 | ret = i2c_smbus_read_byte_data(client, cmd); |
1591caf2 CLG |
223 | if (ret < 0) { |
224 | dev_err(&client->dev, "%s: reg 0x%x, err %d\n", | |
225 | __func__, n, ret); | |
226 | return ret; | |
227 | } | |
228 | *val = (u8)ret; | |
229 | return 0; | |
f46e9203 NC |
230 | } |
231 | ||
7086625f EJ |
232 | static int pca955x_read_pwm(struct i2c_client *client, int n, u8 *val) |
233 | { | |
234 | struct pca955x *pca955x = i2c_get_clientdata(client); | |
235 | u8 cmd = pca95xx_num_input_regs(pca955x->chipdef->bits) + 1 + (2 * n); | |
236 | int ret; | |
237 | ||
238 | ret = i2c_smbus_read_byte_data(client, cmd); | |
239 | if (ret < 0) { | |
240 | dev_err(&client->dev, "%s: reg 0x%x, err %d\n", | |
241 | __func__, n, ret); | |
242 | return ret; | |
243 | } | |
244 | *val = (u8)ret; | |
245 | return 0; | |
246 | } | |
247 | ||
248 | static enum led_brightness pca955x_led_get(struct led_classdev *led_cdev) | |
249 | { | |
250 | struct pca955x_led *pca955x_led = container_of(led_cdev, | |
251 | struct pca955x_led, | |
252 | led_cdev); | |
253 | struct pca955x *pca955x = pca955x_led->pca955x; | |
254 | u8 ls, pwm; | |
255 | int ret; | |
256 | ||
257 | ret = pca955x_read_ls(pca955x->client, pca955x_led->led_num / 4, &ls); | |
258 | if (ret) | |
259 | return ret; | |
260 | ||
261 | ls = (ls >> ((pca955x_led->led_num % 4) << 1)) & 0x3; | |
262 | switch (ls) { | |
263 | case PCA955X_LS_LED_ON: | |
264 | ret = LED_FULL; | |
265 | break; | |
266 | case PCA955X_LS_LED_OFF: | |
267 | ret = LED_OFF; | |
268 | break; | |
269 | case PCA955X_LS_BLINK0: | |
270 | ret = LED_HALF; | |
271 | break; | |
272 | case PCA955X_LS_BLINK1: | |
273 | ret = pca955x_read_pwm(pca955x->client, 1, &pwm); | |
274 | if (ret) | |
275 | return ret; | |
276 | ret = 255 - pwm; | |
277 | break; | |
278 | } | |
279 | ||
280 | return ret; | |
281 | } | |
282 | ||
c3482b82 AL |
283 | static int pca955x_led_set(struct led_classdev *led_cdev, |
284 | enum led_brightness value) | |
f46e9203 | 285 | { |
e7e11d8b AS |
286 | struct pca955x_led *pca955x_led; |
287 | struct pca955x *pca955x; | |
f46e9203 NC |
288 | u8 ls; |
289 | int chip_ls; /* which LSx to use (0-3 potentially) */ | |
290 | int ls_led; /* which set of bits within LSx to use (0-3) */ | |
1591caf2 | 291 | int ret; |
f46e9203 | 292 | |
c3482b82 | 293 | pca955x_led = container_of(led_cdev, struct pca955x_led, led_cdev); |
e7e11d8b AS |
294 | pca955x = pca955x_led->pca955x; |
295 | ||
296 | chip_ls = pca955x_led->led_num / 4; | |
297 | ls_led = pca955x_led->led_num % 4; | |
298 | ||
299 | mutex_lock(&pca955x->lock); | |
f46e9203 | 300 | |
1591caf2 CLG |
301 | ret = pca955x_read_ls(pca955x->client, chip_ls, &ls); |
302 | if (ret) | |
303 | goto out; | |
f46e9203 | 304 | |
c3482b82 | 305 | switch (value) { |
f46e9203 NC |
306 | case LED_FULL: |
307 | ls = pca955x_ledsel(ls, ls_led, PCA955X_LS_LED_ON); | |
308 | break; | |
309 | case LED_OFF: | |
310 | ls = pca955x_ledsel(ls, ls_led, PCA955X_LS_LED_OFF); | |
311 | break; | |
312 | case LED_HALF: | |
313 | ls = pca955x_ledsel(ls, ls_led, PCA955X_LS_BLINK0); | |
314 | break; | |
315 | default: | |
316 | /* | |
317 | * Use PWM1 for all other values. This has the unwanted | |
318 | * side effect of making all LEDs on the chip share the | |
319 | * same brightness level if set to a value other than | |
320 | * OFF, HALF, or FULL. But, this is probably better than | |
321 | * just turning off for all other values. | |
322 | */ | |
1591caf2 CLG |
323 | ret = pca955x_write_pwm(pca955x->client, 1, 255 - value); |
324 | if (ret) | |
325 | goto out; | |
f46e9203 NC |
326 | ls = pca955x_ledsel(ls, ls_led, PCA955X_LS_BLINK1); |
327 | break; | |
328 | } | |
329 | ||
1591caf2 | 330 | ret = pca955x_write_ls(pca955x->client, chip_ls, ls); |
e7e11d8b | 331 | |
1591caf2 | 332 | out: |
e7e11d8b | 333 | mutex_unlock(&pca955x->lock); |
f46e9203 | 334 | |
1591caf2 | 335 | return ret; |
f46e9203 NC |
336 | } |
337 | ||
561099a1 CLG |
338 | #ifdef CONFIG_LEDS_PCA955X_GPIO |
339 | /* | |
340 | * Read the INPUT register, which contains the state of LEDs. | |
341 | */ | |
1591caf2 | 342 | static int pca955x_read_input(struct i2c_client *client, int n, u8 *val) |
561099a1 | 343 | { |
1591caf2 CLG |
344 | int ret = i2c_smbus_read_byte_data(client, n); |
345 | ||
346 | if (ret < 0) { | |
347 | dev_err(&client->dev, "%s: reg 0x%x, err %d\n", | |
348 | __func__, n, ret); | |
349 | return ret; | |
350 | } | |
351 | *val = (u8)ret; | |
352 | return 0; | |
353 | ||
561099a1 CLG |
354 | } |
355 | ||
356 | static int pca955x_gpio_request_pin(struct gpio_chip *gc, unsigned int offset) | |
357 | { | |
358 | struct pca955x *pca955x = gpiochip_get_data(gc); | |
561099a1 | 359 | |
ca386253 AJ |
360 | return test_and_set_bit(offset, &pca955x->active_pins) ? -EBUSY : 0; |
361 | } | |
362 | ||
363 | static void pca955x_gpio_free_pin(struct gpio_chip *gc, unsigned int offset) | |
364 | { | |
365 | struct pca955x *pca955x = gpiochip_get_data(gc); | |
561099a1 | 366 | |
ca386253 | 367 | clear_bit(offset, &pca955x->active_pins); |
561099a1 CLG |
368 | } |
369 | ||
1591caf2 CLG |
370 | static int pca955x_set_value(struct gpio_chip *gc, unsigned int offset, |
371 | int val) | |
561099a1 CLG |
372 | { |
373 | struct pca955x *pca955x = gpiochip_get_data(gc); | |
374 | struct pca955x_led *led = &pca955x->leds[offset]; | |
375 | ||
376 | if (val) | |
52ca7d0f AJ |
377 | return pca955x_led_set(&led->led_cdev, PCA955X_GPIO_HIGH); |
378 | ||
379 | return pca955x_led_set(&led->led_cdev, PCA955X_GPIO_LOW); | |
1591caf2 CLG |
380 | } |
381 | ||
382 | static void pca955x_gpio_set_value(struct gpio_chip *gc, unsigned int offset, | |
383 | int val) | |
384 | { | |
385 | pca955x_set_value(gc, offset, val); | |
561099a1 CLG |
386 | } |
387 | ||
388 | static int pca955x_gpio_get_value(struct gpio_chip *gc, unsigned int offset) | |
389 | { | |
390 | struct pca955x *pca955x = gpiochip_get_data(gc); | |
391 | struct pca955x_led *led = &pca955x->leds[offset]; | |
1591caf2 CLG |
392 | u8 reg = 0; |
393 | ||
394 | /* There is nothing we can do about errors */ | |
395 | pca955x_read_input(pca955x->client, led->led_num / 8, ®); | |
561099a1 CLG |
396 | |
397 | return !!(reg & (1 << (led->led_num % 8))); | |
398 | } | |
399 | ||
400 | static int pca955x_gpio_direction_input(struct gpio_chip *gc, | |
401 | unsigned int offset) | |
402 | { | |
52ca7d0f AJ |
403 | struct pca955x *pca955x = gpiochip_get_data(gc); |
404 | struct pca955x_led *led = &pca955x->leds[offset]; | |
405 | ||
406 | /* To use as input ensure pin is not driven. */ | |
407 | return pca955x_led_set(&led->led_cdev, PCA955X_GPIO_INPUT); | |
561099a1 CLG |
408 | } |
409 | ||
410 | static int pca955x_gpio_direction_output(struct gpio_chip *gc, | |
411 | unsigned int offset, int val) | |
412 | { | |
1591caf2 | 413 | return pca955x_set_value(gc, offset, val); |
561099a1 CLG |
414 | } |
415 | #endif /* CONFIG_LEDS_PCA955X_GPIO */ | |
416 | ||
ed1f4b96 | 417 | static struct pca955x_platform_data * |
967f69de | 418 | pca955x_get_pdata(struct i2c_client *client, struct pca955x_chipdef *chip) |
ed1f4b96 | 419 | { |
ed1f4b96 | 420 | struct pca955x_platform_data *pdata; |
2420ae02 | 421 | struct pca955x_led *led; |
967f69de | 422 | struct fwnode_handle *child; |
ed1f4b96 CLG |
423 | int count; |
424 | ||
967f69de | 425 | count = device_get_child_node_count(&client->dev); |
e26557a0 | 426 | if (count > chip->bits) |
ed1f4b96 CLG |
427 | return ERR_PTR(-ENODEV); |
428 | ||
429 | pdata = devm_kzalloc(&client->dev, sizeof(*pdata), GFP_KERNEL); | |
430 | if (!pdata) | |
431 | return ERR_PTR(-ENOMEM); | |
432 | ||
a86854d0 KC |
433 | pdata->leds = devm_kcalloc(&client->dev, |
434 | chip->bits, sizeof(struct pca955x_led), | |
ed1f4b96 CLG |
435 | GFP_KERNEL); |
436 | if (!pdata->leds) | |
437 | return ERR_PTR(-ENOMEM); | |
438 | ||
967f69de | 439 | device_for_each_child_node(&client->dev, child) { |
ed1f4b96 CLG |
440 | u32 reg; |
441 | int res; | |
442 | ||
967f69de | 443 | res = fwnode_property_read_u32(child, "reg", ®); |
ed1f4b96 CLG |
444 | if ((res != 0) || (reg >= chip->bits)) |
445 | continue; | |
446 | ||
2420ae02 | 447 | led = &pdata->leds[reg]; |
2420ae02 | 448 | led->type = PCA955X_TYPE_LED; |
7c481592 | 449 | led->fwnode = child; |
0dd37b1c | 450 | led->default_state = led_init_default_state_get(child); |
e46cb6d0 | 451 | |
0dd37b1c | 452 | fwnode_property_read_u32(child, "type", &led->type); |
ed1f4b96 CLG |
453 | } |
454 | ||
455 | pdata->num_leds = chip->bits; | |
456 | ||
457 | return pdata; | |
458 | } | |
459 | ||
460 | static const struct of_device_id of_pca955x_match[] = { | |
461 | { .compatible = "nxp,pca9550", .data = (void *)pca9550 }, | |
462 | { .compatible = "nxp,pca9551", .data = (void *)pca9551 }, | |
463 | { .compatible = "nxp,pca9552", .data = (void *)pca9552 }, | |
46de3adb | 464 | { .compatible = "ibm,pca9552", .data = (void *)ibm_pca9552 }, |
ed1f4b96 CLG |
465 | { .compatible = "nxp,pca9553", .data = (void *)pca9553 }, |
466 | {}, | |
467 | }; | |
ed1f4b96 | 468 | MODULE_DEVICE_TABLE(of, of_pca955x_match); |
ed1f4b96 | 469 | |
239f32b4 | 470 | static int pca955x_probe(struct i2c_client *client) |
f46e9203 | 471 | { |
e7e11d8b AS |
472 | struct pca955x *pca955x; |
473 | struct pca955x_led *pca955x_led; | |
f46e9203 | 474 | struct pca955x_chipdef *chip; |
2420ae02 | 475 | struct led_classdev *led; |
7c481592 | 476 | struct led_init_data init_data; |
f46e9203 | 477 | struct i2c_adapter *adapter; |
95bf14bf | 478 | int i, err; |
ed1f4b96 | 479 | struct pca955x_platform_data *pdata; |
7c481592 | 480 | bool set_default_label = false; |
e46cb6d0 | 481 | bool keep_pwm = false; |
7c481592 | 482 | char default_label[8]; |
239f32b4 EJ |
483 | enum pca955x_type chip_type; |
484 | const void *md = device_get_match_data(&client->dev); | |
f46e9203 | 485 | |
239f32b4 EJ |
486 | if (md) { |
487 | chip_type = (enum pca955x_type)md; | |
488 | } else { | |
489 | const struct i2c_device_id *id = i2c_match_id(pca955x_id, | |
490 | client); | |
491 | ||
492 | if (id) { | |
493 | chip_type = (enum pca955x_type)id->driver_data; | |
494 | } else { | |
495 | dev_err(&client->dev, "unknown chip\n"); | |
496 | return -ENODEV; | |
497 | } | |
498 | } | |
499 | ||
500 | chip = &pca955x_chipdefs[chip_type]; | |
1c57d9bd | 501 | adapter = client->adapter; |
87aae1ea | 502 | pdata = dev_get_platdata(&client->dev); |
ed1f4b96 | 503 | if (!pdata) { |
967f69de | 504 | pdata = pca955x_get_pdata(client, chip); |
ed1f4b96 CLG |
505 | if (IS_ERR(pdata)) |
506 | return PTR_ERR(pdata); | |
507 | } | |
f46e9203 NC |
508 | |
509 | /* Make sure the slave address / chip type combo given is possible */ | |
510 | if ((client->addr & ~((1 << chip->slv_addr_shift) - 1)) != | |
511 | chip->slv_addr) { | |
512 | dev_err(&client->dev, "invalid slave address %02x\n", | |
2420ae02 | 513 | client->addr); |
f46e9203 NC |
514 | return -ENODEV; |
515 | } | |
516 | ||
b40b0c17 | 517 | dev_info(&client->dev, "leds-pca955x: Using %s %d-bit LED driver at " |
2420ae02 EJ |
518 | "slave address 0x%02x\n", client->name, chip->bits, |
519 | client->addr); | |
f46e9203 | 520 | |
aace34c0 | 521 | if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) |
f46e9203 NC |
522 | return -EIO; |
523 | ||
ed1f4b96 CLG |
524 | if (pdata->num_leds != chip->bits) { |
525 | dev_err(&client->dev, | |
526 | "board info claims %d LEDs on a %d-bit chip\n", | |
527 | pdata->num_leds, chip->bits); | |
528 | return -ENODEV; | |
f46e9203 NC |
529 | } |
530 | ||
73759f6a | 531 | pca955x = devm_kzalloc(&client->dev, sizeof(*pca955x), GFP_KERNEL); |
95bf14bf SW |
532 | if (!pca955x) |
533 | return -ENOMEM; | |
534 | ||
2420ae02 EJ |
535 | pca955x->leds = devm_kcalloc(&client->dev, chip->bits, |
536 | sizeof(*pca955x_led), GFP_KERNEL); | |
73759f6a BW |
537 | if (!pca955x->leds) |
538 | return -ENOMEM; | |
e7e11d8b | 539 | |
95bf14bf SW |
540 | i2c_set_clientdata(client, pca955x); |
541 | ||
e7e11d8b AS |
542 | mutex_init(&pca955x->lock); |
543 | pca955x->client = client; | |
544 | pca955x->chipdef = chip; | |
545 | ||
7c481592 EJ |
546 | init_data.devname_mandatory = false; |
547 | init_data.devicename = "pca955x"; | |
548 | ||
f46e9203 | 549 | for (i = 0; i < chip->bits; i++) { |
e7e11d8b AS |
550 | pca955x_led = &pca955x->leds[i]; |
551 | pca955x_led->led_num = i; | |
552 | pca955x_led->pca955x = pca955x; | |
561099a1 CLG |
553 | pca955x_led->type = pdata->leds[i].type; |
554 | ||
555 | switch (pca955x_led->type) { | |
556 | case PCA955X_TYPE_NONE: | |
561099a1 | 557 | case PCA955X_TYPE_GPIO: |
561099a1 CLG |
558 | break; |
559 | case PCA955X_TYPE_LED: | |
2420ae02 | 560 | led = &pca955x_led->led_cdev; |
2420ae02 | 561 | led->brightness_set_blocking = pca955x_led_set; |
7086625f | 562 | led->brightness_get = pca955x_led_get; |
f46e9203 | 563 | |
0dd37b1c | 564 | if (pdata->leds[i].default_state == LEDS_DEFSTATE_OFF) { |
e46cb6d0 EJ |
565 | err = pca955x_led_set(led, LED_OFF); |
566 | if (err) | |
567 | return err; | |
0dd37b1c | 568 | } else if (pdata->leds[i].default_state == LEDS_DEFSTATE_ON) { |
e46cb6d0 EJ |
569 | err = pca955x_led_set(led, LED_FULL); |
570 | if (err) | |
571 | return err; | |
572 | } | |
573 | ||
7c481592 EJ |
574 | init_data.fwnode = pdata->leds[i].fwnode; |
575 | ||
576 | if (is_of_node(init_data.fwnode)) { | |
577 | if (to_of_node(init_data.fwnode)->name[0] == | |
578 | '\0') | |
579 | set_default_label = true; | |
580 | else | |
581 | set_default_label = false; | |
582 | } else { | |
583 | set_default_label = true; | |
584 | } | |
585 | ||
586 | if (set_default_label) { | |
587 | snprintf(default_label, sizeof(default_label), | |
588 | "%d", i); | |
589 | init_data.default_label = default_label; | |
590 | } else { | |
591 | init_data.default_label = NULL; | |
592 | } | |
593 | ||
594 | err = devm_led_classdev_register_ext(&client->dev, led, | |
595 | &init_data); | |
561099a1 CLG |
596 | if (err) |
597 | return err; | |
f46e9203 | 598 | |
ca386253 AJ |
599 | set_bit(i, &pca955x->active_pins); |
600 | ||
e46cb6d0 EJ |
601 | /* |
602 | * For default-state == "keep", let the core update the | |
603 | * brightness from the hardware, then check the | |
604 | * brightness to see if it's using PWM1. If so, PWM1 | |
605 | * should not be written below. | |
606 | */ | |
0dd37b1c | 607 | if (pdata->leds[i].default_state == LEDS_DEFSTATE_KEEP) { |
e46cb6d0 EJ |
608 | if (led->brightness != LED_FULL && |
609 | led->brightness != LED_OFF && | |
610 | led->brightness != LED_HALF) | |
611 | keep_pwm = true; | |
612 | } | |
561099a1 CLG |
613 | } |
614 | } | |
f46e9203 NC |
615 | |
616 | /* PWM0 is used for half brightness or 50% duty cycle */ | |
1591caf2 CLG |
617 | err = pca955x_write_pwm(client, 0, 255 - LED_HALF); |
618 | if (err) | |
619 | return err; | |
f46e9203 | 620 | |
e46cb6d0 EJ |
621 | if (!keep_pwm) { |
622 | /* PWM1 is used for variable brightness, default to OFF */ | |
623 | err = pca955x_write_pwm(client, 1, 0); | |
624 | if (err) | |
625 | return err; | |
626 | } | |
f46e9203 NC |
627 | |
628 | /* Set to fast frequency so we do not see flashing */ | |
1591caf2 CLG |
629 | err = pca955x_write_psc(client, 0, 0); |
630 | if (err) | |
631 | return err; | |
632 | err = pca955x_write_psc(client, 1, 0); | |
633 | if (err) | |
634 | return err; | |
f46e9203 | 635 | |
561099a1 | 636 | #ifdef CONFIG_LEDS_PCA955X_GPIO |
ca386253 AJ |
637 | pca955x->gpio.label = "gpio-pca955x"; |
638 | pca955x->gpio.direction_input = pca955x_gpio_direction_input; | |
639 | pca955x->gpio.direction_output = pca955x_gpio_direction_output; | |
640 | pca955x->gpio.set = pca955x_gpio_set_value; | |
641 | pca955x->gpio.get = pca955x_gpio_get_value; | |
642 | pca955x->gpio.request = pca955x_gpio_request_pin; | |
643 | pca955x->gpio.free = pca955x_gpio_free_pin; | |
644 | pca955x->gpio.can_sleep = 1; | |
645 | pca955x->gpio.base = -1; | |
646 | pca955x->gpio.ngpio = chip->bits; | |
647 | pca955x->gpio.parent = &client->dev; | |
648 | pca955x->gpio.owner = THIS_MODULE; | |
649 | ||
650 | err = devm_gpiochip_add_data(&client->dev, &pca955x->gpio, | |
651 | pca955x); | |
652 | if (err) { | |
653 | /* Use data->gpio.dev as a flag for freeing gpiochip */ | |
654 | pca955x->gpio.parent = NULL; | |
655 | dev_warn(&client->dev, "could not add gpiochip\n"); | |
656 | return err; | |
561099a1 | 657 | } |
ca386253 AJ |
658 | dev_info(&client->dev, "gpios %i...%i\n", |
659 | pca955x->gpio.base, pca955x->gpio.base + | |
660 | pca955x->gpio.ngpio - 1); | |
561099a1 CLG |
661 | #endif |
662 | ||
f46e9203 | 663 | return 0; |
f46e9203 NC |
664 | } |
665 | ||
666 | static struct i2c_driver pca955x_driver = { | |
667 | .driver = { | |
668 | .name = "leds-pca955x", | |
967f69de | 669 | .of_match_table = of_pca955x_match, |
f46e9203 | 670 | }, |
d9ff8a8e | 671 | .probe = pca955x_probe, |
f46e9203 NC |
672 | .id_table = pca955x_id, |
673 | }; | |
674 | ||
09a0d183 | 675 | module_i2c_driver(pca955x_driver); |
f46e9203 NC |
676 | |
677 | MODULE_AUTHOR("Nate Case <ncase@xes-inc.com>"); | |
678 | MODULE_DESCRIPTION("PCA955x LED driver"); | |
679 | MODULE_LICENSE("GPL v2"); |