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f46e9203 NC |
1 | /* |
2 | * Copyright 2007-2008 Extreme Engineering Solutions, Inc. | |
3 | * | |
4 | * Author: Nate Case <ncase@xes-inc.com> | |
5 | * | |
6 | * This file is subject to the terms and conditions of version 2 of | |
7 | * the GNU General Public License. See the file COPYING in the main | |
8 | * directory of this archive for more details. | |
9 | * | |
10 | * LED driver for various PCA955x I2C LED drivers | |
11 | * | |
12 | * Supported devices: | |
13 | * | |
14 | * Device Description 7-bit slave address | |
15 | * ------ ----------- ------------------- | |
16 | * PCA9550 2-bit driver 0x60 .. 0x61 | |
17 | * PCA9551 8-bit driver 0x60 .. 0x67 | |
18 | * PCA9552 16-bit driver 0x60 .. 0x67 | |
19 | * PCA9553/01 4-bit driver 0x62 | |
20 | * PCA9553/02 4-bit driver 0x63 | |
21 | * | |
22 | * Philips PCA955x LED driver chips follow a register map as shown below: | |
23 | * | |
24 | * Control Register Description | |
25 | * ---------------- ----------- | |
26 | * 0x0 Input register 0 | |
27 | * .. | |
28 | * NUM_INPUT_REGS - 1 Last Input register X | |
29 | * | |
30 | * NUM_INPUT_REGS Frequency prescaler 0 | |
31 | * NUM_INPUT_REGS + 1 PWM register 0 | |
32 | * NUM_INPUT_REGS + 2 Frequency prescaler 1 | |
33 | * NUM_INPUT_REGS + 3 PWM register 1 | |
34 | * | |
35 | * NUM_INPUT_REGS + 4 LED selector 0 | |
36 | * NUM_INPUT_REGS + 4 | |
37 | * + NUM_LED_REGS - 1 Last LED selector | |
38 | * | |
39 | * where NUM_INPUT_REGS and NUM_LED_REGS vary depending on how many | |
40 | * bits the chip supports. | |
41 | */ | |
42 | ||
44b3e31d | 43 | #include <linux/acpi.h> |
f46e9203 | 44 | #include <linux/ctype.h> |
ed1f4b96 | 45 | #include <linux/delay.h> |
f46e9203 | 46 | #include <linux/err.h> |
ed1f4b96 | 47 | #include <linux/gpio.h> |
f46e9203 | 48 | #include <linux/i2c.h> |
ed1f4b96 CLG |
49 | #include <linux/leds.h> |
50 | #include <linux/module.h> | |
51 | #include <linux/of_device.h> | |
52 | #include <linux/of.h> | |
5a0e3ad6 | 53 | #include <linux/slab.h> |
ed1f4b96 | 54 | #include <linux/string.h> |
f46e9203 | 55 | |
561099a1 CLG |
56 | #include <dt-bindings/leds/leds-pca955x.h> |
57 | ||
f46e9203 NC |
58 | /* LED select registers determine the source that drives LED outputs */ |
59 | #define PCA955X_LS_LED_ON 0x0 /* Output LOW */ | |
60 | #define PCA955X_LS_LED_OFF 0x1 /* Output HI-Z */ | |
61 | #define PCA955X_LS_BLINK0 0x2 /* Blink at PWM0 rate */ | |
62 | #define PCA955X_LS_BLINK1 0x3 /* Blink at PWM1 rate */ | |
63 | ||
52ca7d0f AJ |
64 | #define PCA955X_GPIO_INPUT LED_OFF |
65 | #define PCA955X_GPIO_HIGH LED_OFF | |
66 | #define PCA955X_GPIO_LOW LED_FULL | |
67 | ||
f46e9203 NC |
68 | enum pca955x_type { |
69 | pca9550, | |
70 | pca9551, | |
71 | pca9552, | |
72 | pca9553, | |
73 | }; | |
74 | ||
75 | struct pca955x_chipdef { | |
76 | int bits; | |
77 | u8 slv_addr; /* 7-bit slave address mask */ | |
78 | int slv_addr_shift; /* Number of bits to ignore */ | |
79 | }; | |
80 | ||
81 | static struct pca955x_chipdef pca955x_chipdefs[] = { | |
82 | [pca9550] = { | |
83 | .bits = 2, | |
84 | .slv_addr = /* 110000x */ 0x60, | |
85 | .slv_addr_shift = 1, | |
86 | }, | |
87 | [pca9551] = { | |
88 | .bits = 8, | |
89 | .slv_addr = /* 1100xxx */ 0x60, | |
90 | .slv_addr_shift = 3, | |
91 | }, | |
92 | [pca9552] = { | |
93 | .bits = 16, | |
94 | .slv_addr = /* 1100xxx */ 0x60, | |
95 | .slv_addr_shift = 3, | |
96 | }, | |
97 | [pca9553] = { | |
98 | .bits = 4, | |
99 | .slv_addr = /* 110001x */ 0x62, | |
100 | .slv_addr_shift = 1, | |
101 | }, | |
102 | }; | |
103 | ||
104 | static const struct i2c_device_id pca955x_id[] = { | |
105 | { "pca9550", pca9550 }, | |
106 | { "pca9551", pca9551 }, | |
107 | { "pca9552", pca9552 }, | |
108 | { "pca9553", pca9553 }, | |
109 | { } | |
110 | }; | |
111 | MODULE_DEVICE_TABLE(i2c, pca955x_id); | |
112 | ||
44b3e31d TH |
113 | static const struct acpi_device_id pca955x_acpi_ids[] = { |
114 | { "PCA9550", pca9550 }, | |
115 | { "PCA9551", pca9551 }, | |
116 | { "PCA9552", pca9552 }, | |
117 | { "PCA9553", pca9553 }, | |
118 | { } | |
119 | }; | |
120 | MODULE_DEVICE_TABLE(acpi, pca955x_acpi_ids); | |
121 | ||
e7e11d8b AS |
122 | struct pca955x { |
123 | struct mutex lock; | |
124 | struct pca955x_led *leds; | |
f46e9203 NC |
125 | struct pca955x_chipdef *chipdef; |
126 | struct i2c_client *client; | |
561099a1 CLG |
127 | #ifdef CONFIG_LEDS_PCA955X_GPIO |
128 | struct gpio_chip gpio; | |
129 | #endif | |
e7e11d8b AS |
130 | }; |
131 | ||
132 | struct pca955x_led { | |
133 | struct pca955x *pca955x; | |
f46e9203 NC |
134 | struct led_classdev led_cdev; |
135 | int led_num; /* 0 .. 15 potentially */ | |
136 | char name[32]; | |
561099a1 | 137 | u32 type; |
ed1f4b96 CLG |
138 | const char *default_trigger; |
139 | }; | |
140 | ||
141 | struct pca955x_platform_data { | |
142 | struct pca955x_led *leds; | |
143 | int num_leds; | |
f46e9203 NC |
144 | }; |
145 | ||
146 | /* 8 bits per input register */ | |
147 | static inline int pca95xx_num_input_regs(int bits) | |
148 | { | |
149 | return (bits + 7) / 8; | |
150 | } | |
151 | ||
152 | /* 4 bits per LED selector register */ | |
153 | static inline int pca95xx_num_led_regs(int bits) | |
154 | { | |
155 | return (bits + 3) / 4; | |
156 | } | |
157 | ||
158 | /* | |
159 | * Return an LED selector register value based on an existing one, with | |
160 | * the appropriate 2-bit state value set for the given LED number (0-3). | |
161 | */ | |
162 | static inline u8 pca955x_ledsel(u8 oldval, int led_num, int state) | |
163 | { | |
164 | return (oldval & (~(0x3 << (led_num << 1)))) | | |
165 | ((state & 0x3) << (led_num << 1)); | |
166 | } | |
167 | ||
168 | /* | |
169 | * Write to frequency prescaler register, used to program the | |
170 | * period of the PWM output. period = (PSCx + 1) / 38 | |
171 | */ | |
1591caf2 | 172 | static int pca955x_write_psc(struct i2c_client *client, int n, u8 val) |
f46e9203 | 173 | { |
e7e11d8b | 174 | struct pca955x *pca955x = i2c_get_clientdata(client); |
1591caf2 | 175 | int ret; |
f46e9203 | 176 | |
1591caf2 | 177 | ret = i2c_smbus_write_byte_data(client, |
f46e9203 NC |
178 | pca95xx_num_input_regs(pca955x->chipdef->bits) + 2*n, |
179 | val); | |
1591caf2 CLG |
180 | if (ret < 0) |
181 | dev_err(&client->dev, "%s: reg 0x%x, val 0x%x, err %d\n", | |
182 | __func__, n, val, ret); | |
183 | return ret; | |
f46e9203 NC |
184 | } |
185 | ||
186 | /* | |
187 | * Write to PWM register, which determines the duty cycle of the | |
188 | * output. LED is OFF when the count is less than the value of this | |
189 | * register, and ON when it is greater. If PWMx == 0, LED is always OFF. | |
190 | * | |
191 | * Duty cycle is (256 - PWMx) / 256 | |
192 | */ | |
1591caf2 | 193 | static int pca955x_write_pwm(struct i2c_client *client, int n, u8 val) |
f46e9203 | 194 | { |
e7e11d8b | 195 | struct pca955x *pca955x = i2c_get_clientdata(client); |
1591caf2 | 196 | int ret; |
f46e9203 | 197 | |
1591caf2 | 198 | ret = i2c_smbus_write_byte_data(client, |
f46e9203 NC |
199 | pca95xx_num_input_regs(pca955x->chipdef->bits) + 1 + 2*n, |
200 | val); | |
1591caf2 CLG |
201 | if (ret < 0) |
202 | dev_err(&client->dev, "%s: reg 0x%x, val 0x%x, err %d\n", | |
203 | __func__, n, val, ret); | |
204 | return ret; | |
f46e9203 NC |
205 | } |
206 | ||
207 | /* | |
208 | * Write to LED selector register, which determines the source that | |
209 | * drives the LED output. | |
210 | */ | |
1591caf2 | 211 | static int pca955x_write_ls(struct i2c_client *client, int n, u8 val) |
f46e9203 | 212 | { |
e7e11d8b | 213 | struct pca955x *pca955x = i2c_get_clientdata(client); |
1591caf2 | 214 | int ret; |
f46e9203 | 215 | |
1591caf2 | 216 | ret = i2c_smbus_write_byte_data(client, |
f46e9203 NC |
217 | pca95xx_num_input_regs(pca955x->chipdef->bits) + 4 + n, |
218 | val); | |
1591caf2 CLG |
219 | if (ret < 0) |
220 | dev_err(&client->dev, "%s: reg 0x%x, val 0x%x, err %d\n", | |
221 | __func__, n, val, ret); | |
222 | return ret; | |
f46e9203 NC |
223 | } |
224 | ||
225 | /* | |
226 | * Read the LED selector register, which determines the source that | |
227 | * drives the LED output. | |
228 | */ | |
1591caf2 | 229 | static int pca955x_read_ls(struct i2c_client *client, int n, u8 *val) |
f46e9203 | 230 | { |
e7e11d8b | 231 | struct pca955x *pca955x = i2c_get_clientdata(client); |
1591caf2 | 232 | int ret; |
f46e9203 | 233 | |
1591caf2 | 234 | ret = i2c_smbus_read_byte_data(client, |
f46e9203 | 235 | pca95xx_num_input_regs(pca955x->chipdef->bits) + 4 + n); |
1591caf2 CLG |
236 | if (ret < 0) { |
237 | dev_err(&client->dev, "%s: reg 0x%x, err %d\n", | |
238 | __func__, n, ret); | |
239 | return ret; | |
240 | } | |
241 | *val = (u8)ret; | |
242 | return 0; | |
f46e9203 NC |
243 | } |
244 | ||
c3482b82 AL |
245 | static int pca955x_led_set(struct led_classdev *led_cdev, |
246 | enum led_brightness value) | |
f46e9203 | 247 | { |
e7e11d8b AS |
248 | struct pca955x_led *pca955x_led; |
249 | struct pca955x *pca955x; | |
f46e9203 NC |
250 | u8 ls; |
251 | int chip_ls; /* which LSx to use (0-3 potentially) */ | |
252 | int ls_led; /* which set of bits within LSx to use (0-3) */ | |
1591caf2 | 253 | int ret; |
f46e9203 | 254 | |
c3482b82 | 255 | pca955x_led = container_of(led_cdev, struct pca955x_led, led_cdev); |
e7e11d8b AS |
256 | pca955x = pca955x_led->pca955x; |
257 | ||
258 | chip_ls = pca955x_led->led_num / 4; | |
259 | ls_led = pca955x_led->led_num % 4; | |
260 | ||
261 | mutex_lock(&pca955x->lock); | |
f46e9203 | 262 | |
1591caf2 CLG |
263 | ret = pca955x_read_ls(pca955x->client, chip_ls, &ls); |
264 | if (ret) | |
265 | goto out; | |
f46e9203 | 266 | |
c3482b82 | 267 | switch (value) { |
f46e9203 NC |
268 | case LED_FULL: |
269 | ls = pca955x_ledsel(ls, ls_led, PCA955X_LS_LED_ON); | |
270 | break; | |
271 | case LED_OFF: | |
272 | ls = pca955x_ledsel(ls, ls_led, PCA955X_LS_LED_OFF); | |
273 | break; | |
274 | case LED_HALF: | |
275 | ls = pca955x_ledsel(ls, ls_led, PCA955X_LS_BLINK0); | |
276 | break; | |
277 | default: | |
278 | /* | |
279 | * Use PWM1 for all other values. This has the unwanted | |
280 | * side effect of making all LEDs on the chip share the | |
281 | * same brightness level if set to a value other than | |
282 | * OFF, HALF, or FULL. But, this is probably better than | |
283 | * just turning off for all other values. | |
284 | */ | |
1591caf2 CLG |
285 | ret = pca955x_write_pwm(pca955x->client, 1, 255 - value); |
286 | if (ret) | |
287 | goto out; | |
f46e9203 NC |
288 | ls = pca955x_ledsel(ls, ls_led, PCA955X_LS_BLINK1); |
289 | break; | |
290 | } | |
291 | ||
1591caf2 | 292 | ret = pca955x_write_ls(pca955x->client, chip_ls, ls); |
e7e11d8b | 293 | |
1591caf2 | 294 | out: |
e7e11d8b | 295 | mutex_unlock(&pca955x->lock); |
f46e9203 | 296 | |
1591caf2 | 297 | return ret; |
f46e9203 NC |
298 | } |
299 | ||
561099a1 CLG |
300 | #ifdef CONFIG_LEDS_PCA955X_GPIO |
301 | /* | |
302 | * Read the INPUT register, which contains the state of LEDs. | |
303 | */ | |
1591caf2 | 304 | static int pca955x_read_input(struct i2c_client *client, int n, u8 *val) |
561099a1 | 305 | { |
1591caf2 CLG |
306 | int ret = i2c_smbus_read_byte_data(client, n); |
307 | ||
308 | if (ret < 0) { | |
309 | dev_err(&client->dev, "%s: reg 0x%x, err %d\n", | |
310 | __func__, n, ret); | |
311 | return ret; | |
312 | } | |
313 | *val = (u8)ret; | |
314 | return 0; | |
315 | ||
561099a1 CLG |
316 | } |
317 | ||
318 | static int pca955x_gpio_request_pin(struct gpio_chip *gc, unsigned int offset) | |
319 | { | |
320 | struct pca955x *pca955x = gpiochip_get_data(gc); | |
321 | struct pca955x_led *led = &pca955x->leds[offset]; | |
322 | ||
323 | if (led->type == PCA955X_TYPE_GPIO) | |
324 | return 0; | |
325 | ||
326 | return -EBUSY; | |
327 | } | |
328 | ||
1591caf2 CLG |
329 | static int pca955x_set_value(struct gpio_chip *gc, unsigned int offset, |
330 | int val) | |
561099a1 CLG |
331 | { |
332 | struct pca955x *pca955x = gpiochip_get_data(gc); | |
333 | struct pca955x_led *led = &pca955x->leds[offset]; | |
334 | ||
335 | if (val) | |
52ca7d0f AJ |
336 | return pca955x_led_set(&led->led_cdev, PCA955X_GPIO_HIGH); |
337 | ||
338 | return pca955x_led_set(&led->led_cdev, PCA955X_GPIO_LOW); | |
1591caf2 CLG |
339 | } |
340 | ||
341 | static void pca955x_gpio_set_value(struct gpio_chip *gc, unsigned int offset, | |
342 | int val) | |
343 | { | |
344 | pca955x_set_value(gc, offset, val); | |
561099a1 CLG |
345 | } |
346 | ||
347 | static int pca955x_gpio_get_value(struct gpio_chip *gc, unsigned int offset) | |
348 | { | |
349 | struct pca955x *pca955x = gpiochip_get_data(gc); | |
350 | struct pca955x_led *led = &pca955x->leds[offset]; | |
1591caf2 CLG |
351 | u8 reg = 0; |
352 | ||
353 | /* There is nothing we can do about errors */ | |
354 | pca955x_read_input(pca955x->client, led->led_num / 8, ®); | |
561099a1 CLG |
355 | |
356 | return !!(reg & (1 << (led->led_num % 8))); | |
357 | } | |
358 | ||
359 | static int pca955x_gpio_direction_input(struct gpio_chip *gc, | |
360 | unsigned int offset) | |
361 | { | |
52ca7d0f AJ |
362 | struct pca955x *pca955x = gpiochip_get_data(gc); |
363 | struct pca955x_led *led = &pca955x->leds[offset]; | |
364 | ||
365 | /* To use as input ensure pin is not driven. */ | |
366 | return pca955x_led_set(&led->led_cdev, PCA955X_GPIO_INPUT); | |
561099a1 CLG |
367 | } |
368 | ||
369 | static int pca955x_gpio_direction_output(struct gpio_chip *gc, | |
370 | unsigned int offset, int val) | |
371 | { | |
1591caf2 | 372 | return pca955x_set_value(gc, offset, val); |
561099a1 CLG |
373 | } |
374 | #endif /* CONFIG_LEDS_PCA955X_GPIO */ | |
375 | ||
ed1f4b96 CLG |
376 | #if IS_ENABLED(CONFIG_OF) |
377 | static struct pca955x_platform_data * | |
378 | pca955x_pdata_of_init(struct i2c_client *client, struct pca955x_chipdef *chip) | |
379 | { | |
380 | struct device_node *np = client->dev.of_node; | |
381 | struct device_node *child; | |
382 | struct pca955x_platform_data *pdata; | |
383 | int count; | |
384 | ||
385 | count = of_get_child_count(np); | |
386 | if (!count || count > chip->bits) | |
387 | return ERR_PTR(-ENODEV); | |
388 | ||
389 | pdata = devm_kzalloc(&client->dev, sizeof(*pdata), GFP_KERNEL); | |
390 | if (!pdata) | |
391 | return ERR_PTR(-ENOMEM); | |
392 | ||
a86854d0 KC |
393 | pdata->leds = devm_kcalloc(&client->dev, |
394 | chip->bits, sizeof(struct pca955x_led), | |
ed1f4b96 CLG |
395 | GFP_KERNEL); |
396 | if (!pdata->leds) | |
397 | return ERR_PTR(-ENOMEM); | |
398 | ||
399 | for_each_child_of_node(np, child) { | |
400 | const char *name; | |
401 | u32 reg; | |
402 | int res; | |
403 | ||
404 | res = of_property_read_u32(child, "reg", ®); | |
405 | if ((res != 0) || (reg >= chip->bits)) | |
406 | continue; | |
407 | ||
408 | if (of_property_read_string(child, "label", &name)) | |
409 | name = child->name; | |
410 | ||
411 | snprintf(pdata->leds[reg].name, sizeof(pdata->leds[reg].name), | |
412 | "%s", name); | |
413 | ||
561099a1 CLG |
414 | pdata->leds[reg].type = PCA955X_TYPE_LED; |
415 | of_property_read_u32(child, "type", &pdata->leds[reg].type); | |
ed1f4b96 CLG |
416 | of_property_read_string(child, "linux,default-trigger", |
417 | &pdata->leds[reg].default_trigger); | |
418 | } | |
419 | ||
420 | pdata->num_leds = chip->bits; | |
421 | ||
422 | return pdata; | |
423 | } | |
424 | ||
425 | static const struct of_device_id of_pca955x_match[] = { | |
426 | { .compatible = "nxp,pca9550", .data = (void *)pca9550 }, | |
427 | { .compatible = "nxp,pca9551", .data = (void *)pca9551 }, | |
428 | { .compatible = "nxp,pca9552", .data = (void *)pca9552 }, | |
429 | { .compatible = "nxp,pca9553", .data = (void *)pca9553 }, | |
430 | {}, | |
431 | }; | |
432 | ||
433 | MODULE_DEVICE_TABLE(of, of_pca955x_match); | |
434 | #else | |
435 | static struct pca955x_platform_data * | |
436 | pca955x_pdata_of_init(struct i2c_client *client, struct pca955x_chipdef *chip) | |
437 | { | |
438 | return ERR_PTR(-ENODEV); | |
439 | } | |
440 | #endif | |
441 | ||
98ea1ea2 | 442 | static int pca955x_probe(struct i2c_client *client, |
f46e9203 NC |
443 | const struct i2c_device_id *id) |
444 | { | |
e7e11d8b AS |
445 | struct pca955x *pca955x; |
446 | struct pca955x_led *pca955x_led; | |
f46e9203 NC |
447 | struct pca955x_chipdef *chip; |
448 | struct i2c_adapter *adapter; | |
95bf14bf | 449 | int i, err; |
ed1f4b96 | 450 | struct pca955x_platform_data *pdata; |
561099a1 | 451 | int ngpios = 0; |
f46e9203 | 452 | |
44b3e31d TH |
453 | if (id) { |
454 | chip = &pca955x_chipdefs[id->driver_data]; | |
455 | } else { | |
456 | const struct acpi_device_id *acpi_id; | |
457 | ||
458 | acpi_id = acpi_match_device(pca955x_acpi_ids, &client->dev); | |
459 | if (!acpi_id) | |
460 | return -ENODEV; | |
461 | chip = &pca955x_chipdefs[acpi_id->driver_data]; | |
462 | } | |
f46e9203 | 463 | adapter = to_i2c_adapter(client->dev.parent); |
87aae1ea | 464 | pdata = dev_get_platdata(&client->dev); |
ed1f4b96 CLG |
465 | if (!pdata) { |
466 | pdata = pca955x_pdata_of_init(client, chip); | |
467 | if (IS_ERR(pdata)) | |
468 | return PTR_ERR(pdata); | |
469 | } | |
f46e9203 NC |
470 | |
471 | /* Make sure the slave address / chip type combo given is possible */ | |
472 | if ((client->addr & ~((1 << chip->slv_addr_shift) - 1)) != | |
473 | chip->slv_addr) { | |
474 | dev_err(&client->dev, "invalid slave address %02x\n", | |
475 | client->addr); | |
476 | return -ENODEV; | |
477 | } | |
478 | ||
b40b0c17 | 479 | dev_info(&client->dev, "leds-pca955x: Using %s %d-bit LED driver at " |
f46e9203 | 480 | "slave address 0x%02x\n", |
44b3e31d | 481 | client->name, chip->bits, client->addr); |
f46e9203 | 482 | |
aace34c0 | 483 | if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) |
f46e9203 NC |
484 | return -EIO; |
485 | ||
ed1f4b96 CLG |
486 | if (pdata->num_leds != chip->bits) { |
487 | dev_err(&client->dev, | |
488 | "board info claims %d LEDs on a %d-bit chip\n", | |
489 | pdata->num_leds, chip->bits); | |
490 | return -ENODEV; | |
f46e9203 NC |
491 | } |
492 | ||
73759f6a | 493 | pca955x = devm_kzalloc(&client->dev, sizeof(*pca955x), GFP_KERNEL); |
95bf14bf SW |
494 | if (!pca955x) |
495 | return -ENOMEM; | |
496 | ||
a86854d0 KC |
497 | pca955x->leds = devm_kcalloc(&client->dev, |
498 | chip->bits, sizeof(*pca955x_led), GFP_KERNEL); | |
73759f6a BW |
499 | if (!pca955x->leds) |
500 | return -ENOMEM; | |
e7e11d8b | 501 | |
95bf14bf SW |
502 | i2c_set_clientdata(client, pca955x); |
503 | ||
e7e11d8b AS |
504 | mutex_init(&pca955x->lock); |
505 | pca955x->client = client; | |
506 | pca955x->chipdef = chip; | |
507 | ||
f46e9203 | 508 | for (i = 0; i < chip->bits; i++) { |
e7e11d8b AS |
509 | pca955x_led = &pca955x->leds[i]; |
510 | pca955x_led->led_num = i; | |
511 | pca955x_led->pca955x = pca955x; | |
561099a1 CLG |
512 | pca955x_led->type = pdata->leds[i].type; |
513 | ||
514 | switch (pca955x_led->type) { | |
515 | case PCA955X_TYPE_NONE: | |
516 | break; | |
517 | case PCA955X_TYPE_GPIO: | |
518 | ngpios++; | |
519 | break; | |
520 | case PCA955X_TYPE_LED: | |
521 | /* | |
522 | * Platform data can specify LED names and | |
523 | * default triggers | |
524 | */ | |
390c97dc JA |
525 | if (pdata->leds[i].name[0] == '\0') |
526 | snprintf(pdata->leds[i].name, | |
527 | sizeof(pdata->leds[i].name), "%d", i); | |
528 | ||
529 | snprintf(pca955x_led->name, | |
530 | sizeof(pca955x_led->name), "pca955x:%s", | |
531 | pdata->leds[i].name); | |
532 | ||
f46e9203 | 533 | if (pdata->leds[i].default_trigger) |
e7e11d8b | 534 | pca955x_led->led_cdev.default_trigger = |
f46e9203 | 535 | pdata->leds[i].default_trigger; |
f46e9203 | 536 | |
561099a1 CLG |
537 | pca955x_led->led_cdev.name = pca955x_led->name; |
538 | pca955x_led->led_cdev.brightness_set_blocking = | |
539 | pca955x_led_set; | |
f46e9203 | 540 | |
561099a1 CLG |
541 | err = devm_led_classdev_register(&client->dev, |
542 | &pca955x_led->led_cdev); | |
543 | if (err) | |
544 | return err; | |
f46e9203 | 545 | |
561099a1 | 546 | /* Turn off LED */ |
1591caf2 CLG |
547 | err = pca955x_led_set(&pca955x_led->led_cdev, LED_OFF); |
548 | if (err) | |
549 | return err; | |
561099a1 CLG |
550 | } |
551 | } | |
f46e9203 NC |
552 | |
553 | /* PWM0 is used for half brightness or 50% duty cycle */ | |
1591caf2 CLG |
554 | err = pca955x_write_pwm(client, 0, 255 - LED_HALF); |
555 | if (err) | |
556 | return err; | |
f46e9203 NC |
557 | |
558 | /* PWM1 is used for variable brightness, default to OFF */ | |
1591caf2 CLG |
559 | err = pca955x_write_pwm(client, 1, 0); |
560 | if (err) | |
561 | return err; | |
f46e9203 NC |
562 | |
563 | /* Set to fast frequency so we do not see flashing */ | |
1591caf2 CLG |
564 | err = pca955x_write_psc(client, 0, 0); |
565 | if (err) | |
566 | return err; | |
567 | err = pca955x_write_psc(client, 1, 0); | |
568 | if (err) | |
569 | return err; | |
f46e9203 | 570 | |
561099a1 CLG |
571 | #ifdef CONFIG_LEDS_PCA955X_GPIO |
572 | if (ngpios) { | |
573 | pca955x->gpio.label = "gpio-pca955x"; | |
574 | pca955x->gpio.direction_input = pca955x_gpio_direction_input; | |
575 | pca955x->gpio.direction_output = pca955x_gpio_direction_output; | |
576 | pca955x->gpio.set = pca955x_gpio_set_value; | |
577 | pca955x->gpio.get = pca955x_gpio_get_value; | |
578 | pca955x->gpio.request = pca955x_gpio_request_pin; | |
579 | pca955x->gpio.can_sleep = 1; | |
580 | pca955x->gpio.base = -1; | |
581 | pca955x->gpio.ngpio = ngpios; | |
582 | pca955x->gpio.parent = &client->dev; | |
583 | pca955x->gpio.owner = THIS_MODULE; | |
584 | ||
585 | err = devm_gpiochip_add_data(&client->dev, &pca955x->gpio, | |
586 | pca955x); | |
587 | if (err) { | |
588 | /* Use data->gpio.dev as a flag for freeing gpiochip */ | |
589 | pca955x->gpio.parent = NULL; | |
590 | dev_warn(&client->dev, "could not add gpiochip\n"); | |
591 | return err; | |
592 | } | |
593 | dev_info(&client->dev, "gpios %i...%i\n", | |
594 | pca955x->gpio.base, pca955x->gpio.base + | |
595 | pca955x->gpio.ngpio - 1); | |
596 | } | |
597 | #endif | |
598 | ||
f46e9203 | 599 | return 0; |
f46e9203 NC |
600 | } |
601 | ||
602 | static struct i2c_driver pca955x_driver = { | |
603 | .driver = { | |
604 | .name = "leds-pca955x", | |
44b3e31d | 605 | .acpi_match_table = ACPI_PTR(pca955x_acpi_ids), |
ed1f4b96 | 606 | .of_match_table = of_match_ptr(of_pca955x_match), |
f46e9203 NC |
607 | }, |
608 | .probe = pca955x_probe, | |
f46e9203 NC |
609 | .id_table = pca955x_id, |
610 | }; | |
611 | ||
09a0d183 | 612 | module_i2c_driver(pca955x_driver); |
f46e9203 NC |
613 | |
614 | MODULE_AUTHOR("Nate Case <ncase@xes-inc.com>"); | |
615 | MODULE_DESCRIPTION("PCA955x LED driver"); | |
616 | MODULE_LICENSE("GPL v2"); |