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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
43#include <linux/module.h>
44#include <linux/delay.h>
45#include <linux/string.h>
46#include <linux/ctype.h>
47#include <linux/leds.h>
48#include <linux/err.h>
49#include <linux/i2c.h>
50#include <linux/workqueue.h>
51#include <linux/slab.h>
52
53/* LED select registers determine the source that drives LED outputs */
54#define PCA955X_LS_LED_ON 0x0 /* Output LOW */
55#define PCA955X_LS_LED_OFF 0x1 /* Output HI-Z */
56#define PCA955X_LS_BLINK0 0x2 /* Blink at PWM0 rate */
57#define PCA955X_LS_BLINK1 0x3 /* Blink at PWM1 rate */
58
59enum pca955x_type {
60 pca9550,
61 pca9551,
62 pca9552,
63 pca9553,
64};
65
66struct pca955x_chipdef {
67 int bits;
68 u8 slv_addr; /* 7-bit slave address mask */
69 int slv_addr_shift; /* Number of bits to ignore */
70};
71
72static struct pca955x_chipdef pca955x_chipdefs[] = {
73 [pca9550] = {
74 .bits = 2,
75 .slv_addr = /* 110000x */ 0x60,
76 .slv_addr_shift = 1,
77 },
78 [pca9551] = {
79 .bits = 8,
80 .slv_addr = /* 1100xxx */ 0x60,
81 .slv_addr_shift = 3,
82 },
83 [pca9552] = {
84 .bits = 16,
85 .slv_addr = /* 1100xxx */ 0x60,
86 .slv_addr_shift = 3,
87 },
88 [pca9553] = {
89 .bits = 4,
90 .slv_addr = /* 110001x */ 0x62,
91 .slv_addr_shift = 1,
92 },
93};
94
95static const struct i2c_device_id pca955x_id[] = {
96 { "pca9550", pca9550 },
97 { "pca9551", pca9551 },
98 { "pca9552", pca9552 },
99 { "pca9553", pca9553 },
100 { }
101};
102MODULE_DEVICE_TABLE(i2c, pca955x_id);
103
104struct pca955x {
105 struct mutex lock;
106 struct pca955x_led *leds;
107 struct pca955x_chipdef *chipdef;
108 struct i2c_client *client;
109};
110
111struct pca955x_led {
112 struct pca955x *pca955x;
113 struct work_struct work;
114 enum led_brightness brightness;
115 struct led_classdev led_cdev;
116 int led_num; /* 0 .. 15 potentially */
117 char name[32];
118};
119
120/* 8 bits per input register */
121static inline int pca95xx_num_input_regs(int bits)
122{
123 return (bits + 7) / 8;
124}
125
126/* 4 bits per LED selector register */
127static inline int pca95xx_num_led_regs(int bits)
128{
129 return (bits + 3) / 4;
130}
131
132/*
133 * Return an LED selector register value based on an existing one, with
134 * the appropriate 2-bit state value set for the given LED number (0-3).
135 */
136static inline u8 pca955x_ledsel(u8 oldval, int led_num, int state)
137{
138 return (oldval & (~(0x3 << (led_num << 1)))) |
139 ((state & 0x3) << (led_num << 1));
140}
141
142/*
143 * Write to frequency prescaler register, used to program the
144 * period of the PWM output. period = (PSCx + 1) / 38
145 */
146static void pca955x_write_psc(struct i2c_client *client, int n, u8 val)
147{
148 struct pca955x *pca955x = i2c_get_clientdata(client);
149
150 i2c_smbus_write_byte_data(client,
151 pca95xx_num_input_regs(pca955x->chipdef->bits) + 2*n,
152 val);
153}
154
155/*
156 * Write to PWM register, which determines the duty cycle of the
157 * output. LED is OFF when the count is less than the value of this
158 * register, and ON when it is greater. If PWMx == 0, LED is always OFF.
159 *
160 * Duty cycle is (256 - PWMx) / 256
161 */
162static void pca955x_write_pwm(struct i2c_client *client, int n, u8 val)
163{
164 struct pca955x *pca955x = i2c_get_clientdata(client);
165
166 i2c_smbus_write_byte_data(client,
167 pca95xx_num_input_regs(pca955x->chipdef->bits) + 1 + 2*n,
168 val);
169}
170
171/*
172 * Write to LED selector register, which determines the source that
173 * drives the LED output.
174 */
175static void pca955x_write_ls(struct i2c_client *client, int n, u8 val)
176{
177 struct pca955x *pca955x = i2c_get_clientdata(client);
178
179 i2c_smbus_write_byte_data(client,
180 pca95xx_num_input_regs(pca955x->chipdef->bits) + 4 + n,
181 val);
182}
183
184/*
185 * Read the LED selector register, which determines the source that
186 * drives the LED output.
187 */
188static u8 pca955x_read_ls(struct i2c_client *client, int n)
189{
190 struct pca955x *pca955x = i2c_get_clientdata(client);
191
192 return (u8) i2c_smbus_read_byte_data(client,
193 pca95xx_num_input_regs(pca955x->chipdef->bits) + 4 + n);
194}
195
196static void pca955x_led_work(struct work_struct *work)
197{
198 struct pca955x_led *pca955x_led;
199 struct pca955x *pca955x;
200 u8 ls;
201 int chip_ls; /* which LSx to use (0-3 potentially) */
202 int ls_led; /* which set of bits within LSx to use (0-3) */
203
204 pca955x_led = container_of(work, struct pca955x_led, work);
205 pca955x = pca955x_led->pca955x;
206
207 chip_ls = pca955x_led->led_num / 4;
208 ls_led = pca955x_led->led_num % 4;
209
210 mutex_lock(&pca955x->lock);
211
212 ls = pca955x_read_ls(pca955x->client, chip_ls);
213
214 switch (pca955x_led->brightness) {
215 case LED_FULL:
216 ls = pca955x_ledsel(ls, ls_led, PCA955X_LS_LED_ON);
217 break;
218 case LED_OFF:
219 ls = pca955x_ledsel(ls, ls_led, PCA955X_LS_LED_OFF);
220 break;
221 case LED_HALF:
222 ls = pca955x_ledsel(ls, ls_led, PCA955X_LS_BLINK0);
223 break;
224 default:
225 /*
226 * Use PWM1 for all other values. This has the unwanted
227 * side effect of making all LEDs on the chip share the
228 * same brightness level if set to a value other than
229 * OFF, HALF, or FULL. But, this is probably better than
230 * just turning off for all other values.
231 */
232 pca955x_write_pwm(pca955x->client, 1,
233 255 - pca955x_led->brightness);
234 ls = pca955x_ledsel(ls, ls_led, PCA955X_LS_BLINK1);
235 break;
236 }
237
238 pca955x_write_ls(pca955x->client, chip_ls, ls);
239
240 mutex_unlock(&pca955x->lock);
241}
242
243static void pca955x_led_set(struct led_classdev *led_cdev, enum led_brightness value)
244{
245 struct pca955x_led *pca955x;
246
247 pca955x = container_of(led_cdev, struct pca955x_led, led_cdev);
248
249 pca955x->brightness = value;
250
251 /*
252 * Must use workqueue for the actual I/O since I2C operations
253 * can sleep.
254 */
255 schedule_work(&pca955x->work);
256}
257
258static int __devinit pca955x_probe(struct i2c_client *client,
259 const struct i2c_device_id *id)
260{
261 struct pca955x *pca955x;
262 struct pca955x_led *pca955x_led;
263 struct pca955x_chipdef *chip;
264 struct i2c_adapter *adapter;
265 struct led_platform_data *pdata;
266 int i, err;
267
268 chip = &pca955x_chipdefs[id->driver_data];
269 adapter = to_i2c_adapter(client->dev.parent);
270 pdata = client->dev.platform_data;
271
272 /* Make sure the slave address / chip type combo given is possible */
273 if ((client->addr & ~((1 << chip->slv_addr_shift) - 1)) !=
274 chip->slv_addr) {
275 dev_err(&client->dev, "invalid slave address %02x\n",
276 client->addr);
277 return -ENODEV;
278 }
279
280 printk(KERN_INFO "leds-pca955x: Using %s %d-bit LED driver at "
281 "slave address 0x%02x\n",
282 id->name, chip->bits, client->addr);
283
284 if (!i2c_check_functionality(adapter, I2C_FUNC_I2C))
285 return -EIO;
286
287 if (pdata) {
288 if (pdata->num_leds != chip->bits) {
289 dev_err(&client->dev, "board info claims %d LEDs"
290 " on a %d-bit chip\n",
291 pdata->num_leds, chip->bits);
292 return -ENODEV;
293 }
294 }
295
296 pca955x = kzalloc(sizeof(*pca955x), GFP_KERNEL);
297 if (!pca955x)
298 return -ENOMEM;
299
300 pca955x->leds = kzalloc(sizeof(*pca955x_led) * chip->bits, GFP_KERNEL);
301 if (!pca955x->leds) {
302 err = -ENOMEM;
303 goto exit_nomem;
304 }
305
306 i2c_set_clientdata(client, pca955x);
307
308 mutex_init(&pca955x->lock);
309 pca955x->client = client;
310 pca955x->chipdef = chip;
311
312 for (i = 0; i < chip->bits; i++) {
313 pca955x_led = &pca955x->leds[i];
314 pca955x_led->led_num = i;
315 pca955x_led->pca955x = pca955x;
316
317 /* Platform data can specify LED names and default triggers */
318 if (pdata) {
319 if (pdata->leds[i].name)
320 snprintf(pca955x_led->name,
321 sizeof(pca955x_led->name), "pca955x:%s",
322 pdata->leds[i].name);
323 if (pdata->leds[i].default_trigger)
324 pca955x_led->led_cdev.default_trigger =
325 pdata->leds[i].default_trigger;
326 } else {
327 snprintf(pca955x_led->name, sizeof(pca955x_led->name),
328 "pca955x:%d", i);
329 }
330
331 pca955x_led->led_cdev.name = pca955x_led->name;
332 pca955x_led->led_cdev.brightness_set = pca955x_led_set;
333
334 INIT_WORK(&pca955x_led->work, pca955x_led_work);
335
336 err = led_classdev_register(&client->dev,
337 &pca955x_led->led_cdev);
338 if (err < 0)
339 goto exit;
340 }
341
342 /* Turn off LEDs */
343 for (i = 0; i < pca95xx_num_led_regs(chip->bits); i++)
344 pca955x_write_ls(client, i, 0x55);
345
346 /* PWM0 is used for half brightness or 50% duty cycle */
347 pca955x_write_pwm(client, 0, 255-LED_HALF);
348
349 /* PWM1 is used for variable brightness, default to OFF */
350 pca955x_write_pwm(client, 1, 0);
351
352 /* Set to fast frequency so we do not see flashing */
353 pca955x_write_psc(client, 0, 0);
354 pca955x_write_psc(client, 1, 0);
355
356 return 0;
357
358exit:
359 while (i--) {
360 led_classdev_unregister(&pca955x->leds[i].led_cdev);
361 cancel_work_sync(&pca955x->leds[i].work);
362 }
363
364 kfree(pca955x->leds);
365exit_nomem:
366 kfree(pca955x);
367
368 return err;
369}
370
371static int __devexit pca955x_remove(struct i2c_client *client)
372{
373 struct pca955x *pca955x = i2c_get_clientdata(client);
374 int i;
375
376 for (i = 0; i < pca955x->chipdef->bits; i++) {
377 led_classdev_unregister(&pca955x->leds[i].led_cdev);
378 cancel_work_sync(&pca955x->leds[i].work);
379 }
380
381 kfree(pca955x->leds);
382 kfree(pca955x);
383
384 return 0;
385}
386
387static struct i2c_driver pca955x_driver = {
388 .driver = {
389 .name = "leds-pca955x",
390 .owner = THIS_MODULE,
391 },
392 .probe = pca955x_probe,
393 .remove = __devexit_p(pca955x_remove),
394 .id_table = pca955x_id,
395};
396
397module_i2c_driver(pca955x_driver);
398
399MODULE_AUTHOR("Nate Case <ncase@xes-inc.com>");
400MODULE_DESCRIPTION("PCA955x LED driver");
401MODULE_LICENSE("GPL v2");
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
43#include <linux/acpi.h>
44#include <linux/module.h>
45#include <linux/delay.h>
46#include <linux/string.h>
47#include <linux/ctype.h>
48#include <linux/leds.h>
49#include <linux/err.h>
50#include <linux/i2c.h>
51#include <linux/slab.h>
52
53/* LED select registers determine the source that drives LED outputs */
54#define PCA955X_LS_LED_ON 0x0 /* Output LOW */
55#define PCA955X_LS_LED_OFF 0x1 /* Output HI-Z */
56#define PCA955X_LS_BLINK0 0x2 /* Blink at PWM0 rate */
57#define PCA955X_LS_BLINK1 0x3 /* Blink at PWM1 rate */
58
59enum pca955x_type {
60 pca9550,
61 pca9551,
62 pca9552,
63 pca9553,
64};
65
66struct pca955x_chipdef {
67 int bits;
68 u8 slv_addr; /* 7-bit slave address mask */
69 int slv_addr_shift; /* Number of bits to ignore */
70};
71
72static struct pca955x_chipdef pca955x_chipdefs[] = {
73 [pca9550] = {
74 .bits = 2,
75 .slv_addr = /* 110000x */ 0x60,
76 .slv_addr_shift = 1,
77 },
78 [pca9551] = {
79 .bits = 8,
80 .slv_addr = /* 1100xxx */ 0x60,
81 .slv_addr_shift = 3,
82 },
83 [pca9552] = {
84 .bits = 16,
85 .slv_addr = /* 1100xxx */ 0x60,
86 .slv_addr_shift = 3,
87 },
88 [pca9553] = {
89 .bits = 4,
90 .slv_addr = /* 110001x */ 0x62,
91 .slv_addr_shift = 1,
92 },
93};
94
95static const struct i2c_device_id pca955x_id[] = {
96 { "pca9550", pca9550 },
97 { "pca9551", pca9551 },
98 { "pca9552", pca9552 },
99 { "pca9553", pca9553 },
100 { }
101};
102MODULE_DEVICE_TABLE(i2c, pca955x_id);
103
104static const struct acpi_device_id pca955x_acpi_ids[] = {
105 { "PCA9550", pca9550 },
106 { "PCA9551", pca9551 },
107 { "PCA9552", pca9552 },
108 { "PCA9553", pca9553 },
109 { }
110};
111MODULE_DEVICE_TABLE(acpi, pca955x_acpi_ids);
112
113struct pca955x {
114 struct mutex lock;
115 struct pca955x_led *leds;
116 struct pca955x_chipdef *chipdef;
117 struct i2c_client *client;
118};
119
120struct pca955x_led {
121 struct pca955x *pca955x;
122 struct led_classdev led_cdev;
123 int led_num; /* 0 .. 15 potentially */
124 char name[32];
125};
126
127/* 8 bits per input register */
128static inline int pca95xx_num_input_regs(int bits)
129{
130 return (bits + 7) / 8;
131}
132
133/* 4 bits per LED selector register */
134static inline int pca95xx_num_led_regs(int bits)
135{
136 return (bits + 3) / 4;
137}
138
139/*
140 * Return an LED selector register value based on an existing one, with
141 * the appropriate 2-bit state value set for the given LED number (0-3).
142 */
143static inline u8 pca955x_ledsel(u8 oldval, int led_num, int state)
144{
145 return (oldval & (~(0x3 << (led_num << 1)))) |
146 ((state & 0x3) << (led_num << 1));
147}
148
149/*
150 * Write to frequency prescaler register, used to program the
151 * period of the PWM output. period = (PSCx + 1) / 38
152 */
153static void pca955x_write_psc(struct i2c_client *client, int n, u8 val)
154{
155 struct pca955x *pca955x = i2c_get_clientdata(client);
156
157 i2c_smbus_write_byte_data(client,
158 pca95xx_num_input_regs(pca955x->chipdef->bits) + 2*n,
159 val);
160}
161
162/*
163 * Write to PWM register, which determines the duty cycle of the
164 * output. LED is OFF when the count is less than the value of this
165 * register, and ON when it is greater. If PWMx == 0, LED is always OFF.
166 *
167 * Duty cycle is (256 - PWMx) / 256
168 */
169static void pca955x_write_pwm(struct i2c_client *client, int n, u8 val)
170{
171 struct pca955x *pca955x = i2c_get_clientdata(client);
172
173 i2c_smbus_write_byte_data(client,
174 pca95xx_num_input_regs(pca955x->chipdef->bits) + 1 + 2*n,
175 val);
176}
177
178/*
179 * Write to LED selector register, which determines the source that
180 * drives the LED output.
181 */
182static void pca955x_write_ls(struct i2c_client *client, int n, u8 val)
183{
184 struct pca955x *pca955x = i2c_get_clientdata(client);
185
186 i2c_smbus_write_byte_data(client,
187 pca95xx_num_input_regs(pca955x->chipdef->bits) + 4 + n,
188 val);
189}
190
191/*
192 * Read the LED selector register, which determines the source that
193 * drives the LED output.
194 */
195static u8 pca955x_read_ls(struct i2c_client *client, int n)
196{
197 struct pca955x *pca955x = i2c_get_clientdata(client);
198
199 return (u8) i2c_smbus_read_byte_data(client,
200 pca95xx_num_input_regs(pca955x->chipdef->bits) + 4 + n);
201}
202
203static int pca955x_led_set(struct led_classdev *led_cdev,
204 enum led_brightness value)
205{
206 struct pca955x_led *pca955x_led;
207 struct pca955x *pca955x;
208 u8 ls;
209 int chip_ls; /* which LSx to use (0-3 potentially) */
210 int ls_led; /* which set of bits within LSx to use (0-3) */
211
212 pca955x_led = container_of(led_cdev, struct pca955x_led, led_cdev);
213 pca955x = pca955x_led->pca955x;
214
215 chip_ls = pca955x_led->led_num / 4;
216 ls_led = pca955x_led->led_num % 4;
217
218 mutex_lock(&pca955x->lock);
219
220 ls = pca955x_read_ls(pca955x->client, chip_ls);
221
222 switch (value) {
223 case LED_FULL:
224 ls = pca955x_ledsel(ls, ls_led, PCA955X_LS_LED_ON);
225 break;
226 case LED_OFF:
227 ls = pca955x_ledsel(ls, ls_led, PCA955X_LS_LED_OFF);
228 break;
229 case LED_HALF:
230 ls = pca955x_ledsel(ls, ls_led, PCA955X_LS_BLINK0);
231 break;
232 default:
233 /*
234 * Use PWM1 for all other values. This has the unwanted
235 * side effect of making all LEDs on the chip share the
236 * same brightness level if set to a value other than
237 * OFF, HALF, or FULL. But, this is probably better than
238 * just turning off for all other values.
239 */
240 pca955x_write_pwm(pca955x->client, 1,
241 255 - value);
242 ls = pca955x_ledsel(ls, ls_led, PCA955X_LS_BLINK1);
243 break;
244 }
245
246 pca955x_write_ls(pca955x->client, chip_ls, ls);
247
248 mutex_unlock(&pca955x->lock);
249
250 return 0;
251}
252
253static int pca955x_probe(struct i2c_client *client,
254 const struct i2c_device_id *id)
255{
256 struct pca955x *pca955x;
257 struct pca955x_led *pca955x_led;
258 struct pca955x_chipdef *chip;
259 struct i2c_adapter *adapter;
260 struct led_platform_data *pdata;
261 int i, err;
262
263 if (id) {
264 chip = &pca955x_chipdefs[id->driver_data];
265 } else {
266 const struct acpi_device_id *acpi_id;
267
268 acpi_id = acpi_match_device(pca955x_acpi_ids, &client->dev);
269 if (!acpi_id)
270 return -ENODEV;
271 chip = &pca955x_chipdefs[acpi_id->driver_data];
272 }
273 adapter = to_i2c_adapter(client->dev.parent);
274 pdata = dev_get_platdata(&client->dev);
275
276 /* Make sure the slave address / chip type combo given is possible */
277 if ((client->addr & ~((1 << chip->slv_addr_shift) - 1)) !=
278 chip->slv_addr) {
279 dev_err(&client->dev, "invalid slave address %02x\n",
280 client->addr);
281 return -ENODEV;
282 }
283
284 dev_info(&client->dev, "leds-pca955x: Using %s %d-bit LED driver at "
285 "slave address 0x%02x\n",
286 client->name, chip->bits, client->addr);
287
288 if (!i2c_check_functionality(adapter, I2C_FUNC_I2C))
289 return -EIO;
290
291 if (pdata) {
292 if (pdata->num_leds != chip->bits) {
293 dev_err(&client->dev, "board info claims %d LEDs"
294 " on a %d-bit chip\n",
295 pdata->num_leds, chip->bits);
296 return -ENODEV;
297 }
298 }
299
300 pca955x = devm_kzalloc(&client->dev, sizeof(*pca955x), GFP_KERNEL);
301 if (!pca955x)
302 return -ENOMEM;
303
304 pca955x->leds = devm_kzalloc(&client->dev,
305 sizeof(*pca955x_led) * chip->bits, GFP_KERNEL);
306 if (!pca955x->leds)
307 return -ENOMEM;
308
309 i2c_set_clientdata(client, pca955x);
310
311 mutex_init(&pca955x->lock);
312 pca955x->client = client;
313 pca955x->chipdef = chip;
314
315 for (i = 0; i < chip->bits; i++) {
316 pca955x_led = &pca955x->leds[i];
317 pca955x_led->led_num = i;
318 pca955x_led->pca955x = pca955x;
319
320 /* Platform data can specify LED names and default triggers */
321 if (pdata) {
322 if (pdata->leds[i].name)
323 snprintf(pca955x_led->name,
324 sizeof(pca955x_led->name), "pca955x:%s",
325 pdata->leds[i].name);
326 if (pdata->leds[i].default_trigger)
327 pca955x_led->led_cdev.default_trigger =
328 pdata->leds[i].default_trigger;
329 } else {
330 snprintf(pca955x_led->name, sizeof(pca955x_led->name),
331 "pca955x:%d", i);
332 }
333
334 pca955x_led->led_cdev.name = pca955x_led->name;
335 pca955x_led->led_cdev.brightness_set_blocking = pca955x_led_set;
336
337 err = led_classdev_register(&client->dev,
338 &pca955x_led->led_cdev);
339 if (err < 0)
340 goto exit;
341 }
342
343 /* Turn off LEDs */
344 for (i = 0; i < pca95xx_num_led_regs(chip->bits); i++)
345 pca955x_write_ls(client, i, 0x55);
346
347 /* PWM0 is used for half brightness or 50% duty cycle */
348 pca955x_write_pwm(client, 0, 255-LED_HALF);
349
350 /* PWM1 is used for variable brightness, default to OFF */
351 pca955x_write_pwm(client, 1, 0);
352
353 /* Set to fast frequency so we do not see flashing */
354 pca955x_write_psc(client, 0, 0);
355 pca955x_write_psc(client, 1, 0);
356
357 return 0;
358
359exit:
360 while (i--)
361 led_classdev_unregister(&pca955x->leds[i].led_cdev);
362
363 return err;
364}
365
366static int pca955x_remove(struct i2c_client *client)
367{
368 struct pca955x *pca955x = i2c_get_clientdata(client);
369 int i;
370
371 for (i = 0; i < pca955x->chipdef->bits; i++)
372 led_classdev_unregister(&pca955x->leds[i].led_cdev);
373
374 return 0;
375}
376
377static struct i2c_driver pca955x_driver = {
378 .driver = {
379 .name = "leds-pca955x",
380 .acpi_match_table = ACPI_PTR(pca955x_acpi_ids),
381 },
382 .probe = pca955x_probe,
383 .remove = pca955x_remove,
384 .id_table = pca955x_id,
385};
386
387module_i2c_driver(pca955x_driver);
388
389MODULE_AUTHOR("Nate Case <ncase@xes-inc.com>");
390MODULE_DESCRIPTION("PCA955x LED driver");
391MODULE_LICENSE("GPL v2");