Commit | Line | Data |
---|---|---|
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 | ||
3b581cb5 | 79 | static const struct pca955x_chipdef pca955x_chipdefs[] = { |
f46e9203 NC |
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 | ||
e7e11d8b AS |
107 | struct pca955x { |
108 | struct mutex lock; | |
109 | struct pca955x_led *leds; | |
3b581cb5 | 110 | const struct pca955x_chipdef *chipdef; |
f46e9203 | 111 | struct i2c_client *client; |
ca386253 | 112 | unsigned long active_pins; |
561099a1 CLG |
113 | #ifdef CONFIG_LEDS_PCA955X_GPIO |
114 | struct gpio_chip gpio; | |
115 | #endif | |
e7e11d8b AS |
116 | }; |
117 | ||
118 | struct pca955x_led { | |
119 | struct pca955x *pca955x; | |
f46e9203 NC |
120 | struct led_classdev led_cdev; |
121 | int led_num; /* 0 .. 15 potentially */ | |
561099a1 | 122 | u32 type; |
0dd37b1c | 123 | enum led_default_state default_state; |
7c481592 | 124 | struct fwnode_handle *fwnode; |
ed1f4b96 CLG |
125 | }; |
126 | ||
127 | struct pca955x_platform_data { | |
128 | struct pca955x_led *leds; | |
129 | int num_leds; | |
f46e9203 NC |
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 | ||
f46e9203 NC |
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 | */ | |
1591caf2 | 152 | static int pca955x_write_psc(struct i2c_client *client, int n, u8 val) |
f46e9203 | 153 | { |
e7e11d8b | 154 | struct pca955x *pca955x = i2c_get_clientdata(client); |
2420ae02 | 155 | u8 cmd = pca95xx_num_input_regs(pca955x->chipdef->bits) + (2 * n); |
1591caf2 | 156 | int ret; |
f46e9203 | 157 | |
2420ae02 | 158 | ret = i2c_smbus_write_byte_data(client, cmd, val); |
1591caf2 CLG |
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; | |
f46e9203 NC |
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 | */ | |
1591caf2 | 172 | static int pca955x_write_pwm(struct i2c_client *client, int n, u8 val) |
f46e9203 | 173 | { |
e7e11d8b | 174 | struct pca955x *pca955x = i2c_get_clientdata(client); |
2420ae02 | 175 | u8 cmd = pca95xx_num_input_regs(pca955x->chipdef->bits) + 1 + (2 * n); |
1591caf2 | 176 | int ret; |
f46e9203 | 177 | |
2420ae02 | 178 | ret = i2c_smbus_write_byte_data(client, cmd, val); |
1591caf2 CLG |
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; | |
f46e9203 NC |
183 | } |
184 | ||
185 | /* | |
186 | * Write to LED selector register, which determines the source that | |
187 | * drives the LED output. | |
188 | */ | |
1591caf2 | 189 | static int pca955x_write_ls(struct i2c_client *client, int n, u8 val) |
f46e9203 | 190 | { |
e7e11d8b | 191 | struct pca955x *pca955x = i2c_get_clientdata(client); |
2420ae02 | 192 | u8 cmd = pca95xx_num_input_regs(pca955x->chipdef->bits) + 4 + n; |
1591caf2 | 193 | int ret; |
f46e9203 | 194 | |
2420ae02 | 195 | ret = i2c_smbus_write_byte_data(client, cmd, val); |
1591caf2 CLG |
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; | |
f46e9203 NC |
200 | } |
201 | ||
202 | /* | |
203 | * Read the LED selector register, which determines the source that | |
204 | * drives the LED output. | |
205 | */ | |
1591caf2 | 206 | static int pca955x_read_ls(struct i2c_client *client, int n, u8 *val) |
f46e9203 | 207 | { |
e7e11d8b | 208 | struct pca955x *pca955x = i2c_get_clientdata(client); |
2420ae02 | 209 | u8 cmd = pca95xx_num_input_regs(pca955x->chipdef->bits) + 4 + n; |
1591caf2 | 210 | int ret; |
f46e9203 | 211 | |
2420ae02 | 212 | ret = i2c_smbus_read_byte_data(client, cmd); |
1591caf2 CLG |
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; | |
f46e9203 NC |
220 | } |
221 | ||
7086625f EJ |
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(pca955x->chipdef->bits) + 1 + (2 * n); | |
226 | int ret; | |
227 | ||
228 | ret = i2c_smbus_read_byte_data(client, 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(pca955x->client, pca955x_led->led_num / 4, &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(pca955x->client, 1, &pwm); | |
264 | if (ret) | |
265 | return ret; | |
266 | ret = 255 - pwm; | |
267 | break; | |
268 | } | |
269 | ||
270 | return ret; | |
271 | } | |
272 | ||
c3482b82 AL |
273 | static int pca955x_led_set(struct led_classdev *led_cdev, |
274 | enum led_brightness value) | |
f46e9203 | 275 | { |
e7e11d8b AS |
276 | struct pca955x_led *pca955x_led; |
277 | struct pca955x *pca955x; | |
f46e9203 NC |
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) */ | |
1591caf2 | 281 | int ret; |
f46e9203 | 282 | |
c3482b82 | 283 | pca955x_led = container_of(led_cdev, struct pca955x_led, led_cdev); |
e7e11d8b AS |
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); | |
f46e9203 | 290 | |
1591caf2 CLG |
291 | ret = pca955x_read_ls(pca955x->client, chip_ls, &ls); |
292 | if (ret) | |
293 | goto out; | |
f46e9203 | 294 | |
c3482b82 | 295 | switch (value) { |
f46e9203 NC |
296 | case LED_FULL: |
297 | ls = pca955x_ledsel(ls, ls_led, PCA955X_LS_LED_ON); | |
298 | break; | |
299 | case LED_OFF: | |
300 | ls = pca955x_ledsel(ls, ls_led, PCA955X_LS_LED_OFF); | |
301 | break; | |
302 | case LED_HALF: | |
303 | ls = pca955x_ledsel(ls, 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 | */ | |
1591caf2 CLG |
313 | ret = pca955x_write_pwm(pca955x->client, 1, 255 - value); |
314 | if (ret) | |
315 | goto out; | |
f46e9203 NC |
316 | ls = pca955x_ledsel(ls, ls_led, PCA955X_LS_BLINK1); |
317 | break; | |
318 | } | |
319 | ||
1591caf2 | 320 | ret = pca955x_write_ls(pca955x->client, chip_ls, ls); |
e7e11d8b | 321 | |
1591caf2 | 322 | out: |
e7e11d8b | 323 | mutex_unlock(&pca955x->lock); |
f46e9203 | 324 | |
1591caf2 | 325 | return ret; |
f46e9203 NC |
326 | } |
327 | ||
561099a1 CLG |
328 | #ifdef CONFIG_LEDS_PCA955X_GPIO |
329 | /* | |
330 | * Read the INPUT register, which contains the state of LEDs. | |
331 | */ | |
1591caf2 | 332 | static int pca955x_read_input(struct i2c_client *client, int n, u8 *val) |
561099a1 | 333 | { |
1591caf2 CLG |
334 | int ret = i2c_smbus_read_byte_data(client, 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 | ||
561099a1 CLG |
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); | |
561099a1 | 349 | |
ca386253 AJ |
350 | return test_and_set_bit(offset, &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); | |
561099a1 | 356 | |
ca386253 | 357 | clear_bit(offset, &pca955x->active_pins); |
561099a1 CLG |
358 | } |
359 | ||
1591caf2 CLG |
360 | static int pca955x_set_value(struct gpio_chip *gc, unsigned int offset, |
361 | int val) | |
561099a1 CLG |
362 | { |
363 | struct pca955x *pca955x = gpiochip_get_data(gc); | |
364 | struct pca955x_led *led = &pca955x->leds[offset]; | |
365 | ||
366 | if (val) | |
52ca7d0f AJ |
367 | return pca955x_led_set(&led->led_cdev, PCA955X_GPIO_HIGH); |
368 | ||
369 | return pca955x_led_set(&led->led_cdev, PCA955X_GPIO_LOW); | |
1591caf2 CLG |
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); | |
561099a1 CLG |
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]; | |
1591caf2 CLG |
382 | u8 reg = 0; |
383 | ||
384 | /* There is nothing we can do about errors */ | |
385 | pca955x_read_input(pca955x->client, led->led_num / 8, ®); | |
561099a1 CLG |
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 | { | |
52ca7d0f AJ |
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->led_cdev, PCA955X_GPIO_INPUT); | |
561099a1 CLG |
398 | } |
399 | ||
400 | static int pca955x_gpio_direction_output(struct gpio_chip *gc, | |
401 | unsigned int offset, int val) | |
402 | { | |
1591caf2 | 403 | return pca955x_set_value(gc, offset, val); |
561099a1 CLG |
404 | } |
405 | #endif /* CONFIG_LEDS_PCA955X_GPIO */ | |
406 | ||
ed1f4b96 | 407 | static struct pca955x_platform_data * |
3b581cb5 | 408 | pca955x_get_pdata(struct i2c_client *client, const struct pca955x_chipdef *chip) |
ed1f4b96 | 409 | { |
ed1f4b96 | 410 | struct pca955x_platform_data *pdata; |
2420ae02 | 411 | struct pca955x_led *led; |
967f69de | 412 | struct fwnode_handle *child; |
ed1f4b96 CLG |
413 | int count; |
414 | ||
967f69de | 415 | count = device_get_child_node_count(&client->dev); |
e26557a0 | 416 | if (count > chip->bits) |
ed1f4b96 CLG |
417 | return ERR_PTR(-ENODEV); |
418 | ||
419 | pdata = devm_kzalloc(&client->dev, sizeof(*pdata), GFP_KERNEL); | |
420 | if (!pdata) | |
421 | return ERR_PTR(-ENOMEM); | |
422 | ||
a86854d0 KC |
423 | pdata->leds = devm_kcalloc(&client->dev, |
424 | chip->bits, sizeof(struct pca955x_led), | |
ed1f4b96 CLG |
425 | GFP_KERNEL); |
426 | if (!pdata->leds) | |
427 | return ERR_PTR(-ENOMEM); | |
428 | ||
967f69de | 429 | device_for_each_child_node(&client->dev, child) { |
ed1f4b96 CLG |
430 | u32 reg; |
431 | int res; | |
432 | ||
967f69de | 433 | res = fwnode_property_read_u32(child, "reg", ®); |
ed1f4b96 CLG |
434 | if ((res != 0) || (reg >= chip->bits)) |
435 | continue; | |
436 | ||
2420ae02 | 437 | led = &pdata->leds[reg]; |
2420ae02 | 438 | led->type = PCA955X_TYPE_LED; |
7c481592 | 439 | led->fwnode = child; |
0dd37b1c | 440 | led->default_state = led_init_default_state_get(child); |
e46cb6d0 | 441 | |
0dd37b1c | 442 | fwnode_property_read_u32(child, "type", &led->type); |
ed1f4b96 CLG |
443 | } |
444 | ||
445 | pdata->num_leds = chip->bits; | |
446 | ||
447 | return pdata; | |
448 | } | |
449 | ||
239f32b4 | 450 | static int pca955x_probe(struct i2c_client *client) |
f46e9203 | 451 | { |
e7e11d8b AS |
452 | struct pca955x *pca955x; |
453 | struct pca955x_led *pca955x_led; | |
3b581cb5 | 454 | const struct pca955x_chipdef *chip; |
2420ae02 | 455 | struct led_classdev *led; |
7c481592 | 456 | struct led_init_data init_data; |
f46e9203 | 457 | struct i2c_adapter *adapter; |
95bf14bf | 458 | int i, err; |
ed1f4b96 | 459 | struct pca955x_platform_data *pdata; |
7c481592 | 460 | bool set_default_label = false; |
e46cb6d0 | 461 | bool keep_pwm = false; |
7c481592 | 462 | char default_label[8]; |
239f32b4 | 463 | |
3b581cb5 BD |
464 | chip = i2c_get_match_data(client); |
465 | if (!chip) | |
466 | return dev_err_probe(&client->dev, -ENODEV, "unknown chip\n"); | |
467 | ||
1c57d9bd | 468 | adapter = client->adapter; |
87aae1ea | 469 | pdata = dev_get_platdata(&client->dev); |
ed1f4b96 | 470 | if (!pdata) { |
967f69de | 471 | pdata = pca955x_get_pdata(client, chip); |
ed1f4b96 CLG |
472 | if (IS_ERR(pdata)) |
473 | return PTR_ERR(pdata); | |
474 | } | |
f46e9203 NC |
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", | |
2420ae02 | 480 | client->addr); |
f46e9203 NC |
481 | return -ENODEV; |
482 | } | |
483 | ||
b40b0c17 | 484 | dev_info(&client->dev, "leds-pca955x: Using %s %d-bit LED driver at " |
2420ae02 EJ |
485 | "slave address 0x%02x\n", client->name, chip->bits, |
486 | client->addr); | |
f46e9203 | 487 | |
aace34c0 | 488 | if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) |
f46e9203 NC |
489 | return -EIO; |
490 | ||
ed1f4b96 CLG |
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; | |
f46e9203 NC |
496 | } |
497 | ||
73759f6a | 498 | pca955x = devm_kzalloc(&client->dev, sizeof(*pca955x), GFP_KERNEL); |
95bf14bf SW |
499 | if (!pca955x) |
500 | return -ENOMEM; | |
501 | ||
2420ae02 EJ |
502 | pca955x->leds = devm_kcalloc(&client->dev, chip->bits, |
503 | sizeof(*pca955x_led), GFP_KERNEL); | |
73759f6a BW |
504 | if (!pca955x->leds) |
505 | return -ENOMEM; | |
e7e11d8b | 506 | |
95bf14bf SW |
507 | i2c_set_clientdata(client, pca955x); |
508 | ||
e7e11d8b AS |
509 | mutex_init(&pca955x->lock); |
510 | pca955x->client = client; | |
511 | pca955x->chipdef = chip; | |
512 | ||
7c481592 EJ |
513 | init_data.devname_mandatory = false; |
514 | init_data.devicename = "pca955x"; | |
515 | ||
f46e9203 | 516 | for (i = 0; i < chip->bits; i++) { |
e7e11d8b AS |
517 | pca955x_led = &pca955x->leds[i]; |
518 | pca955x_led->led_num = i; | |
519 | pca955x_led->pca955x = pca955x; | |
561099a1 CLG |
520 | pca955x_led->type = pdata->leds[i].type; |
521 | ||
522 | switch (pca955x_led->type) { | |
523 | case PCA955X_TYPE_NONE: | |
561099a1 | 524 | case PCA955X_TYPE_GPIO: |
561099a1 CLG |
525 | break; |
526 | case PCA955X_TYPE_LED: | |
2420ae02 | 527 | led = &pca955x_led->led_cdev; |
2420ae02 | 528 | led->brightness_set_blocking = pca955x_led_set; |
7086625f | 529 | led->brightness_get = pca955x_led_get; |
f46e9203 | 530 | |
0dd37b1c | 531 | if (pdata->leds[i].default_state == LEDS_DEFSTATE_OFF) { |
e46cb6d0 EJ |
532 | err = pca955x_led_set(led, LED_OFF); |
533 | if (err) | |
534 | return err; | |
0dd37b1c | 535 | } else if (pdata->leds[i].default_state == LEDS_DEFSTATE_ON) { |
e46cb6d0 EJ |
536 | err = pca955x_led_set(led, LED_FULL); |
537 | if (err) | |
538 | return err; | |
539 | } | |
540 | ||
7c481592 EJ |
541 | init_data.fwnode = pdata->leds[i].fwnode; |
542 | ||
543 | if (is_of_node(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(default_label, sizeof(default_label), | |
555 | "%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(&client->dev, led, | |
562 | &init_data); | |
561099a1 CLG |
563 | if (err) |
564 | return err; | |
f46e9203 | 565 | |
ca386253 AJ |
566 | set_bit(i, &pca955x->active_pins); |
567 | ||
e46cb6d0 EJ |
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 | */ | |
0dd37b1c | 574 | if (pdata->leds[i].default_state == LEDS_DEFSTATE_KEEP) { |
e46cb6d0 EJ |
575 | if (led->brightness != LED_FULL && |
576 | led->brightness != LED_OFF && | |
577 | led->brightness != LED_HALF) | |
578 | keep_pwm = true; | |
579 | } | |
561099a1 CLG |
580 | } |
581 | } | |
f46e9203 NC |
582 | |
583 | /* PWM0 is used for half brightness or 50% duty cycle */ | |
1591caf2 CLG |
584 | err = pca955x_write_pwm(client, 0, 255 - LED_HALF); |
585 | if (err) | |
586 | return err; | |
f46e9203 | 587 | |
e46cb6d0 EJ |
588 | if (!keep_pwm) { |
589 | /* PWM1 is used for variable brightness, default to OFF */ | |
590 | err = pca955x_write_pwm(client, 1, 0); | |
591 | if (err) | |
592 | return err; | |
593 | } | |
f46e9203 NC |
594 | |
595 | /* Set to fast frequency so we do not see flashing */ | |
1591caf2 CLG |
596 | err = pca955x_write_psc(client, 0, 0); |
597 | if (err) | |
598 | return err; | |
599 | err = pca955x_write_psc(client, 1, 0); | |
600 | if (err) | |
601 | return err; | |
f46e9203 | 602 | |
561099a1 | 603 | #ifdef CONFIG_LEDS_PCA955X_GPIO |
ca386253 AJ |
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; | |
561099a1 | 624 | } |
ca386253 AJ |
625 | dev_info(&client->dev, "gpios %i...%i\n", |
626 | pca955x->gpio.base, pca955x->gpio.base + | |
627 | pca955x->gpio.ngpio - 1); | |
561099a1 CLG |
628 | #endif |
629 | ||
f46e9203 | 630 | return 0; |
f46e9203 NC |
631 | } |
632 | ||
8d3fd7ed BD |
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 | ||
f46e9203 NC |
653 | static struct i2c_driver pca955x_driver = { |
654 | .driver = { | |
655 | .name = "leds-pca955x", | |
967f69de | 656 | .of_match_table = of_pca955x_match, |
f46e9203 | 657 | }, |
d9ff8a8e | 658 | .probe = pca955x_probe, |
f46e9203 NC |
659 | .id_table = pca955x_id, |
660 | }; | |
661 | ||
09a0d183 | 662 | module_i2c_driver(pca955x_driver); |
f46e9203 NC |
663 | |
664 | MODULE_AUTHOR("Nate Case <ncase@xes-inc.com>"); | |
665 | MODULE_DESCRIPTION("PCA955x LED driver"); | |
666 | MODULE_LICENSE("GPL v2"); |