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15#include <linux/err.h>
16#include <linux/i2c.h>
17#include <linux/leds.h>
18#include <linux/module.h>
19#include <linux/of.h>
20#include <linux/of_device.h>
21#include <linux/regmap.h>
22#include <linux/slab.h>
23
24
25#define IS31FL319X_SHUTDOWN 0x00
26#define IS31FL319X_CTRL1 0x01
27#define IS31FL319X_CTRL2 0x02
28#define IS31FL319X_CONFIG1 0x03
29#define IS31FL319X_CONFIG2 0x04
30#define IS31FL319X_RAMP_MODE 0x05
31#define IS31FL319X_BREATH_MASK 0x06
32#define IS31FL319X_PWM(channel) (0x07 + channel)
33#define IS31FL319X_DATA_UPDATE 0x10
34#define IS31FL319X_T0(channel) (0x11 + channel)
35#define IS31FL319X_T123_1 0x1a
36#define IS31FL319X_T123_2 0x1b
37#define IS31FL319X_T123_3 0x1c
38#define IS31FL319X_T4(channel) (0x1d + channel)
39#define IS31FL319X_TIME_UPDATE 0x26
40#define IS31FL319X_RESET 0xff
41
42#define IS31FL319X_REG_CNT (IS31FL319X_RESET + 1)
43
44#define IS31FL319X_MAX_LEDS 9
45
46
47#define IS31FL319X_CONFIG2_CS_SHIFT 4
48#define IS31FL319X_CONFIG2_CS_MASK 0x7
49#define IS31FL319X_CONFIG2_CS_STEP_REF 12
50
51#define IS31FL319X_CURRENT_MIN ((u32)5000)
52#define IS31FL319X_CURRENT_MAX ((u32)40000)
53#define IS31FL319X_CURRENT_STEP ((u32)5000)
54#define IS31FL319X_CURRENT_DEFAULT ((u32)20000)
55
56
57#define IS31FL319X_AUDIO_GAIN_DB_MAX ((u32)21)
58#define IS31FL319X_AUDIO_GAIN_DB_STEP ((u32)3)
59
60
61
62
63
64
65struct is31fl319x_chip {
66 const struct is31fl319x_chipdef *cdef;
67 struct i2c_client *client;
68 struct regmap *regmap;
69 struct mutex lock;
70 u32 audio_gain_db;
71
72 struct is31fl319x_led {
73 struct is31fl319x_chip *chip;
74 struct led_classdev cdev;
75 u32 max_microamp;
76 bool configured;
77 } leds[IS31FL319X_MAX_LEDS];
78};
79
80struct is31fl319x_chipdef {
81 int num_leds;
82};
83
84static const struct is31fl319x_chipdef is31fl3190_cdef = {
85 .num_leds = 1,
86};
87
88static const struct is31fl319x_chipdef is31fl3193_cdef = {
89 .num_leds = 3,
90};
91
92static const struct is31fl319x_chipdef is31fl3196_cdef = {
93 .num_leds = 6,
94};
95
96static const struct is31fl319x_chipdef is31fl3199_cdef = {
97 .num_leds = 9,
98};
99
100static const struct of_device_id of_is31fl319x_match[] = {
101 { .compatible = "issi,is31fl3190", .data = &is31fl3190_cdef, },
102 { .compatible = "issi,is31fl3191", .data = &is31fl3190_cdef, },
103 { .compatible = "issi,is31fl3193", .data = &is31fl3193_cdef, },
104 { .compatible = "issi,is31fl3196", .data = &is31fl3196_cdef, },
105 { .compatible = "issi,is31fl3199", .data = &is31fl3199_cdef, },
106 { .compatible = "si-en,sn3199", .data = &is31fl3199_cdef, },
107 { }
108};
109MODULE_DEVICE_TABLE(of, of_is31fl319x_match);
110
111static int is31fl319x_brightness_set(struct led_classdev *cdev,
112 enum led_brightness brightness)
113{
114 struct is31fl319x_led *led = container_of(cdev, struct is31fl319x_led,
115 cdev);
116 struct is31fl319x_chip *is31 = led->chip;
117 int chan = led - is31->leds;
118 int ret;
119 int i;
120 u8 ctrl1 = 0, ctrl2 = 0;
121
122 dev_dbg(&is31->client->dev, "%s %d: %d\n", __func__, chan, brightness);
123
124 mutex_lock(&is31->lock);
125
126
127 ret = regmap_write(is31->regmap, IS31FL319X_PWM(chan), brightness);
128 if (ret < 0)
129 goto out;
130
131
132 for (i = 0; i < is31->cdef->num_leds; i++) {
133 unsigned int pwm_value;
134 bool on;
135
136
137
138
139
140
141 ret = regmap_read(is31->regmap, IS31FL319X_PWM(i), &pwm_value);
142 dev_dbg(&is31->client->dev, "%s read %d: ret=%d: %d\n",
143 __func__, i, ret, pwm_value);
144 on = ret >= 0 && pwm_value > LED_OFF;
145
146 if (i < 3)
147 ctrl1 |= on << i;
148 else if (i < 6)
149 ctrl1 |= on << (i + 1);
150 else
151 ctrl2 |= on << (i - 6);
152 }
153
154 if (ctrl1 > 0 || ctrl2 > 0) {
155 dev_dbg(&is31->client->dev, "power up %02x %02x\n",
156 ctrl1, ctrl2);
157 regmap_write(is31->regmap, IS31FL319X_CTRL1, ctrl1);
158 regmap_write(is31->regmap, IS31FL319X_CTRL2, ctrl2);
159
160 regmap_write(is31->regmap, IS31FL319X_DATA_UPDATE, 0x00);
161
162 ret = regmap_write(is31->regmap, IS31FL319X_SHUTDOWN, 0x01);
163 } else {
164 dev_dbg(&is31->client->dev, "power down\n");
165
166 ret = regmap_write(is31->regmap, IS31FL319X_SHUTDOWN, 0x00);
167 }
168
169out:
170 mutex_unlock(&is31->lock);
171
172 return ret;
173}
174
175static int is31fl319x_parse_child_dt(const struct device *dev,
176 const struct device_node *child,
177 struct is31fl319x_led *led)
178{
179 struct led_classdev *cdev = &led->cdev;
180 int ret;
181
182 if (of_property_read_string(child, "label", &cdev->name))
183 cdev->name = child->name;
184
185 ret = of_property_read_string(child, "linux,default-trigger",
186 &cdev->default_trigger);
187 if (ret < 0 && ret != -EINVAL)
188 return ret;
189
190 led->max_microamp = IS31FL319X_CURRENT_DEFAULT;
191 ret = of_property_read_u32(child, "led-max-microamp",
192 &led->max_microamp);
193 if (!ret) {
194 if (led->max_microamp < IS31FL319X_CURRENT_MIN)
195 return -EINVAL;
196 led->max_microamp = min(led->max_microamp,
197 IS31FL319X_CURRENT_MAX);
198 }
199
200 return 0;
201}
202
203static int is31fl319x_parse_dt(struct device *dev,
204 struct is31fl319x_chip *is31)
205{
206 struct device_node *np = dev->of_node, *child;
207 const struct of_device_id *of_dev_id;
208 int count;
209 int ret;
210
211 if (!np)
212 return -ENODEV;
213
214 of_dev_id = of_match_device(of_is31fl319x_match, dev);
215 if (!of_dev_id) {
216 dev_err(dev, "Failed to match device with supported chips\n");
217 return -EINVAL;
218 }
219
220 is31->cdef = of_dev_id->data;
221
222 count = of_get_child_count(np);
223
224 dev_dbg(dev, "probe %s with %d leds defined in DT\n",
225 of_dev_id->compatible, count);
226
227 if (!count || count > is31->cdef->num_leds) {
228 dev_err(dev, "Number of leds defined must be between 1 and %u\n",
229 is31->cdef->num_leds);
230 return -ENODEV;
231 }
232
233 for_each_child_of_node(np, child) {
234 struct is31fl319x_led *led;
235 u32 reg;
236
237 ret = of_property_read_u32(child, "reg", ®);
238 if (ret) {
239 dev_err(dev, "Failed to read led 'reg' property\n");
240 goto put_child_node;
241 }
242
243 if (reg < 1 || reg > is31->cdef->num_leds) {
244 dev_err(dev, "invalid led reg %u\n", reg);
245 ret = -EINVAL;
246 goto put_child_node;
247 }
248
249 led = &is31->leds[reg - 1];
250
251 if (led->configured) {
252 dev_err(dev, "led %u is already configured\n", reg);
253 ret = -EINVAL;
254 goto put_child_node;
255 }
256
257 ret = is31fl319x_parse_child_dt(dev, child, led);
258 if (ret) {
259 dev_err(dev, "led %u DT parsing failed\n", reg);
260 goto put_child_node;
261 }
262
263 led->configured = true;
264 }
265
266 is31->audio_gain_db = 0;
267 ret = of_property_read_u32(np, "audio-gain-db", &is31->audio_gain_db);
268 if (!ret)
269 is31->audio_gain_db = min(is31->audio_gain_db,
270 IS31FL319X_AUDIO_GAIN_DB_MAX);
271
272 return 0;
273
274put_child_node:
275 of_node_put(child);
276 return ret;
277}
278
279static bool is31fl319x_readable_reg(struct device *dev, unsigned int reg)
280{
281 return false;
282}
283
284static bool is31fl319x_volatile_reg(struct device *dev, unsigned int reg)
285{
286 switch (reg) {
287 case IS31FL319X_DATA_UPDATE:
288 case IS31FL319X_TIME_UPDATE:
289 case IS31FL319X_RESET:
290 return true;
291 default:
292 return false;
293 }
294}
295
296static const struct reg_default is31fl319x_reg_defaults[] = {
297 { IS31FL319X_CONFIG1, 0x00},
298 { IS31FL319X_CONFIG2, 0x00},
299 { IS31FL319X_PWM(0), 0x00},
300 { IS31FL319X_PWM(1), 0x00},
301 { IS31FL319X_PWM(2), 0x00},
302 { IS31FL319X_PWM(3), 0x00},
303 { IS31FL319X_PWM(4), 0x00},
304 { IS31FL319X_PWM(5), 0x00},
305 { IS31FL319X_PWM(6), 0x00},
306 { IS31FL319X_PWM(7), 0x00},
307 { IS31FL319X_PWM(8), 0x00},
308};
309
310static struct regmap_config regmap_config = {
311 .reg_bits = 8,
312 .val_bits = 8,
313 .max_register = IS31FL319X_REG_CNT,
314 .cache_type = REGCACHE_FLAT,
315 .readable_reg = is31fl319x_readable_reg,
316 .volatile_reg = is31fl319x_volatile_reg,
317 .reg_defaults = is31fl319x_reg_defaults,
318 .num_reg_defaults = ARRAY_SIZE(is31fl319x_reg_defaults),
319};
320
321static inline int is31fl319x_microamp_to_cs(struct device *dev, u32 microamp)
322{
323 u32 step = microamp / IS31FL319X_CURRENT_STEP;
324
325 return ((IS31FL319X_CONFIG2_CS_STEP_REF - step) &
326 IS31FL319X_CONFIG2_CS_MASK) <<
327 IS31FL319X_CONFIG2_CS_SHIFT;
328}
329
330static inline int is31fl319x_db_to_gain(u32 dezibel)
331{
332 return dezibel / IS31FL319X_AUDIO_GAIN_DB_STEP;
333}
334
335static int is31fl319x_probe(struct i2c_client *client,
336 const struct i2c_device_id *id)
337{
338 struct is31fl319x_chip *is31;
339 struct device *dev = &client->dev;
340 struct i2c_adapter *adapter = to_i2c_adapter(dev->parent);
341 int err;
342 int i = 0;
343 u32 aggregated_led_microamp = IS31FL319X_CURRENT_MAX;
344
345 if (!i2c_check_functionality(adapter, I2C_FUNC_I2C))
346 return -EIO;
347
348 is31 = devm_kzalloc(&client->dev, sizeof(*is31), GFP_KERNEL);
349 if (!is31)
350 return -ENOMEM;
351
352 mutex_init(&is31->lock);
353
354 err = is31fl319x_parse_dt(&client->dev, is31);
355 if (err)
356 goto free_mutex;
357
358 is31->client = client;
359 is31->regmap = devm_regmap_init_i2c(client, ®map_config);
360 if (IS_ERR(is31->regmap)) {
361 dev_err(&client->dev, "failed to allocate register map\n");
362 err = PTR_ERR(is31->regmap);
363 goto free_mutex;
364 }
365
366 i2c_set_clientdata(client, is31);
367
368
369 err = regmap_write(is31->regmap, IS31FL319X_RESET, 0x00);
370 if (err < 0) {
371 dev_err(&client->dev, "no response from chip write: err = %d\n",
372 err);
373 err = -EIO;
374 goto free_mutex;
375 }
376
377
378
379
380
381
382 for (i = 0; i < is31->cdef->num_leds; i++)
383 if (is31->leds[i].configured &&
384 is31->leds[i].max_microamp < aggregated_led_microamp)
385 aggregated_led_microamp = is31->leds[i].max_microamp;
386
387 regmap_write(is31->regmap, IS31FL319X_CONFIG2,
388 is31fl319x_microamp_to_cs(dev, aggregated_led_microamp) |
389 is31fl319x_db_to_gain(is31->audio_gain_db));
390
391 for (i = 0; i < is31->cdef->num_leds; i++) {
392 struct is31fl319x_led *led = &is31->leds[i];
393
394 if (!led->configured)
395 continue;
396
397 led->chip = is31;
398 led->cdev.brightness_set_blocking = is31fl319x_brightness_set;
399
400 err = devm_led_classdev_register(&client->dev, &led->cdev);
401 if (err < 0)
402 goto free_mutex;
403 }
404
405 return 0;
406
407free_mutex:
408 mutex_destroy(&is31->lock);
409 return err;
410}
411
412static int is31fl319x_remove(struct i2c_client *client)
413{
414 struct is31fl319x_chip *is31 = i2c_get_clientdata(client);
415
416 mutex_destroy(&is31->lock);
417 return 0;
418}
419
420
421
422
423
424static const struct i2c_device_id is31fl319x_id[] = {
425 { "is31fl3190" },
426 { "is31fl3191" },
427 { "is31fl3193" },
428 { "is31fl3196" },
429 { "is31fl3199" },
430 { "sn3199" },
431 {},
432};
433MODULE_DEVICE_TABLE(i2c, is31fl319x_id);
434
435static struct i2c_driver is31fl319x_driver = {
436 .driver = {
437 .name = "leds-is31fl319x",
438 .of_match_table = of_match_ptr(of_is31fl319x_match),
439 },
440 .probe = is31fl319x_probe,
441 .remove = is31fl319x_remove,
442 .id_table = is31fl319x_id,
443};
444
445module_i2c_driver(is31fl319x_driver);
446
447MODULE_AUTHOR("H. Nikolaus Schaller <hns@goldelico.com>");
448MODULE_AUTHOR("Andrey Utkin <andrey_utkin@fastmail.com>");
449MODULE_DESCRIPTION("IS31FL319X LED driver");
450MODULE_LICENSE("GPL v2");
451
