Thomas Gleixner | d2912cb | 2019-06-04 10:11:33 +0200 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0-only |
Milo(Woogyom) Kim | c93d08f | 2013-02-05 18:01:23 +0900 | [diff] [blame] | 2 | /* |
Kim, Milo | ff45262a | 2013-02-18 21:10:14 -0800 | [diff] [blame] | 3 | * LP5521/LP5523/LP55231/LP5562 Common Driver |
Milo(Woogyom) Kim | c93d08f | 2013-02-05 18:01:23 +0900 | [diff] [blame] | 4 | * |
| 5 | * Copyright 2012 Texas Instruments |
| 6 | * |
| 7 | * Author: Milo(Woogyom) Kim <milo.kim@ti.com> |
| 8 | * |
Milo(Woogyom) Kim | c93d08f | 2013-02-05 18:01:23 +0900 | [diff] [blame] | 9 | * Derived from leds-lp5521.c, leds-lp5523.c |
| 10 | */ |
| 11 | |
Kim, Milo | 53b4192 | 2013-03-20 17:37:00 -0700 | [diff] [blame] | 12 | #include <linux/clk.h> |
Milo(Woogyom) Kim | a85908d | 2013-02-05 18:07:20 +0900 | [diff] [blame] | 13 | #include <linux/delay.h> |
Milo(Woogyom) Kim | 10c06d1 | 2013-02-05 19:17:20 +0900 | [diff] [blame] | 14 | #include <linux/firmware.h> |
Milo(Woogyom) Kim | c93d08f | 2013-02-05 18:01:23 +0900 | [diff] [blame] | 15 | #include <linux/i2c.h> |
| 16 | #include <linux/leds.h> |
| 17 | #include <linux/module.h> |
| 18 | #include <linux/platform_data/leds-lp55xx.h> |
Linus Walleij | 7542a04b | 2013-04-23 04:52:59 -0700 | [diff] [blame] | 19 | #include <linux/slab.h> |
Linus Walleij | ac219bf | 2020-06-27 00:40:11 +0200 | [diff] [blame] | 20 | #include <linux/gpio/consumer.h> |
Maarten Zanders | 54a7bef | 2023-04-21 09:53:05 +0200 | [diff] [blame] | 21 | #include <dt-bindings/leds/leds-lp55xx.h> |
Milo(Woogyom) Kim | c93d08f | 2013-02-05 18:01:23 +0900 | [diff] [blame] | 22 | |
| 23 | #include "leds-lp55xx-common.h" |
| 24 | |
Kim, Milo | 53b4192 | 2013-03-20 17:37:00 -0700 | [diff] [blame] | 25 | /* External clock rate */ |
| 26 | #define LP55XX_CLK_32K 32768 |
| 27 | |
Milo(Woogyom) Kim | a6e4679 | 2013-02-05 19:08:40 +0900 | [diff] [blame] | 28 | static struct lp55xx_led *cdev_to_lp55xx_led(struct led_classdev *cdev) |
| 29 | { |
| 30 | return container_of(cdev, struct lp55xx_led, cdev); |
| 31 | } |
| 32 | |
Milo(Woogyom) Kim | a96bfa1 | 2013-02-05 19:09:32 +0900 | [diff] [blame] | 33 | static struct lp55xx_led *dev_to_lp55xx_led(struct device *dev) |
| 34 | { |
| 35 | return cdev_to_lp55xx_led(dev_get_drvdata(dev)); |
| 36 | } |
| 37 | |
Dan Murphy | 92a8156 | 2020-07-16 13:20:01 -0500 | [diff] [blame] | 38 | static struct lp55xx_led *mcled_cdev_to_led(struct led_classdev_mc *mc_cdev) |
| 39 | { |
| 40 | return container_of(mc_cdev, struct lp55xx_led, mc_cdev); |
| 41 | } |
| 42 | |
Milo(Woogyom) Kim | 48068d5 | 2013-02-05 18:08:49 +0900 | [diff] [blame] | 43 | static void lp55xx_reset_device(struct lp55xx_chip *chip) |
| 44 | { |
| 45 | struct lp55xx_device_config *cfg = chip->cfg; |
| 46 | u8 addr = cfg->reset.addr; |
| 47 | u8 val = cfg->reset.val; |
| 48 | |
| 49 | /* no error checking here because no ACK from the device after reset */ |
| 50 | lp55xx_write(chip, addr, val); |
| 51 | } |
| 52 | |
Milo(Woogyom) Kim | e3a700d | 2013-02-05 18:09:56 +0900 | [diff] [blame] | 53 | static int lp55xx_detect_device(struct lp55xx_chip *chip) |
| 54 | { |
| 55 | struct lp55xx_device_config *cfg = chip->cfg; |
| 56 | u8 addr = cfg->enable.addr; |
| 57 | u8 val = cfg->enable.val; |
| 58 | int ret; |
| 59 | |
| 60 | ret = lp55xx_write(chip, addr, val); |
| 61 | if (ret) |
| 62 | return ret; |
| 63 | |
| 64 | usleep_range(1000, 2000); |
| 65 | |
| 66 | ret = lp55xx_read(chip, addr, &val); |
| 67 | if (ret) |
| 68 | return ret; |
| 69 | |
| 70 | if (val != cfg->enable.val) |
| 71 | return -ENODEV; |
| 72 | |
| 73 | return 0; |
| 74 | } |
| 75 | |
Milo(Woogyom) Kim | ffbdccd | 2013-02-05 18:57:36 +0900 | [diff] [blame] | 76 | static int lp55xx_post_init_device(struct lp55xx_chip *chip) |
| 77 | { |
| 78 | struct lp55xx_device_config *cfg = chip->cfg; |
| 79 | |
| 80 | if (!cfg->post_init_device) |
| 81 | return 0; |
| 82 | |
| 83 | return cfg->post_init_device(chip); |
| 84 | } |
| 85 | |
Dan Murphy | 7e6f7f3 | 2020-07-13 10:45:29 -0500 | [diff] [blame] | 86 | static ssize_t led_current_show(struct device *dev, |
Milo(Woogyom) Kim | a96bfa1 | 2013-02-05 19:09:32 +0900 | [diff] [blame] | 87 | struct device_attribute *attr, |
| 88 | char *buf) |
| 89 | { |
| 90 | struct lp55xx_led *led = dev_to_lp55xx_led(dev); |
| 91 | |
ye xingchen | 3f6fb1c | 2022-12-01 16:11:24 +0800 | [diff] [blame] | 92 | return sysfs_emit(buf, "%d\n", led->led_current); |
Milo(Woogyom) Kim | a96bfa1 | 2013-02-05 19:09:32 +0900 | [diff] [blame] | 93 | } |
| 94 | |
Dan Murphy | 7e6f7f3 | 2020-07-13 10:45:29 -0500 | [diff] [blame] | 95 | static ssize_t led_current_store(struct device *dev, |
Milo(Woogyom) Kim | a96bfa1 | 2013-02-05 19:09:32 +0900 | [diff] [blame] | 96 | struct device_attribute *attr, |
| 97 | const char *buf, size_t len) |
| 98 | { |
| 99 | struct lp55xx_led *led = dev_to_lp55xx_led(dev); |
| 100 | struct lp55xx_chip *chip = led->chip; |
| 101 | unsigned long curr; |
| 102 | |
| 103 | if (kstrtoul(buf, 0, &curr)) |
| 104 | return -EINVAL; |
| 105 | |
| 106 | if (curr > led->max_current) |
| 107 | return -EINVAL; |
| 108 | |
| 109 | if (!chip->cfg->set_led_current) |
| 110 | return len; |
| 111 | |
| 112 | mutex_lock(&chip->lock); |
| 113 | chip->cfg->set_led_current(led, (u8)curr); |
| 114 | mutex_unlock(&chip->lock); |
| 115 | |
| 116 | return len; |
| 117 | } |
| 118 | |
Dan Murphy | 7e6f7f3 | 2020-07-13 10:45:29 -0500 | [diff] [blame] | 119 | static ssize_t max_current_show(struct device *dev, |
Milo(Woogyom) Kim | a96bfa1 | 2013-02-05 19:09:32 +0900 | [diff] [blame] | 120 | struct device_attribute *attr, |
| 121 | char *buf) |
| 122 | { |
| 123 | struct lp55xx_led *led = dev_to_lp55xx_led(dev); |
| 124 | |
ye xingchen | 3f6fb1c | 2022-12-01 16:11:24 +0800 | [diff] [blame] | 125 | return sysfs_emit(buf, "%d\n", led->max_current); |
Milo(Woogyom) Kim | a96bfa1 | 2013-02-05 19:09:32 +0900 | [diff] [blame] | 126 | } |
| 127 | |
Dan Murphy | 7e6f7f3 | 2020-07-13 10:45:29 -0500 | [diff] [blame] | 128 | static DEVICE_ATTR_RW(led_current); |
| 129 | static DEVICE_ATTR_RO(max_current); |
Milo(Woogyom) Kim | a96bfa1 | 2013-02-05 19:09:32 +0900 | [diff] [blame] | 130 | |
Johan Hovold | 44a1255 | 2014-06-25 10:08:56 -0700 | [diff] [blame] | 131 | static struct attribute *lp55xx_led_attrs[] = { |
Milo(Woogyom) Kim | a96bfa1 | 2013-02-05 19:09:32 +0900 | [diff] [blame] | 132 | &dev_attr_led_current.attr, |
| 133 | &dev_attr_max_current.attr, |
Milo(Woogyom) Kim | 0e20234 | 2013-02-05 19:07:34 +0900 | [diff] [blame] | 134 | NULL, |
| 135 | }; |
Johan Hovold | 44a1255 | 2014-06-25 10:08:56 -0700 | [diff] [blame] | 136 | ATTRIBUTE_GROUPS(lp55xx_led); |
Milo(Woogyom) Kim | 0e20234 | 2013-02-05 19:07:34 +0900 | [diff] [blame] | 137 | |
Dan Murphy | 92a8156 | 2020-07-16 13:20:01 -0500 | [diff] [blame] | 138 | static int lp55xx_set_mc_brightness(struct led_classdev *cdev, |
| 139 | enum led_brightness brightness) |
| 140 | { |
| 141 | struct led_classdev_mc *mc_dev = lcdev_to_mccdev(cdev); |
| 142 | struct lp55xx_led *led = mcled_cdev_to_led(mc_dev); |
| 143 | struct lp55xx_device_config *cfg = led->chip->cfg; |
| 144 | |
| 145 | led_mc_calc_color_components(&led->mc_cdev, brightness); |
| 146 | return cfg->multicolor_brightness_fn(led); |
| 147 | |
| 148 | } |
| 149 | |
Andrew Lunn | 95b2af6 | 2015-08-20 12:22:57 +0200 | [diff] [blame] | 150 | static int lp55xx_set_brightness(struct led_classdev *cdev, |
Milo(Woogyom) Kim | 0e20234 | 2013-02-05 19:07:34 +0900 | [diff] [blame] | 151 | enum led_brightness brightness) |
| 152 | { |
Milo(Woogyom) Kim | a6e4679 | 2013-02-05 19:08:40 +0900 | [diff] [blame] | 153 | struct lp55xx_led *led = cdev_to_lp55xx_led(cdev); |
Andrew Lunn | 95b2af6 | 2015-08-20 12:22:57 +0200 | [diff] [blame] | 154 | struct lp55xx_device_config *cfg = led->chip->cfg; |
Milo(Woogyom) Kim | a6e4679 | 2013-02-05 19:08:40 +0900 | [diff] [blame] | 155 | |
| 156 | led->brightness = (u8)brightness; |
Andrew Lunn | 95b2af6 | 2015-08-20 12:22:57 +0200 | [diff] [blame] | 157 | return cfg->brightness_fn(led); |
Milo(Woogyom) Kim | 0e20234 | 2013-02-05 19:07:34 +0900 | [diff] [blame] | 158 | } |
| 159 | |
Milo(Woogyom) Kim | 9e9b3db | 2013-02-05 19:06:27 +0900 | [diff] [blame] | 160 | static int lp55xx_init_led(struct lp55xx_led *led, |
| 161 | struct lp55xx_chip *chip, int chan) |
| 162 | { |
Milo(Woogyom) Kim | 0e20234 | 2013-02-05 19:07:34 +0900 | [diff] [blame] | 163 | struct lp55xx_platform_data *pdata = chip->pdata; |
| 164 | struct lp55xx_device_config *cfg = chip->cfg; |
| 165 | struct device *dev = &chip->cl->dev; |
Milo(Woogyom) Kim | 0e20234 | 2013-02-05 19:07:34 +0900 | [diff] [blame] | 166 | int max_channel = cfg->max_channel; |
Dan Murphy | 92a8156 | 2020-07-16 13:20:01 -0500 | [diff] [blame] | 167 | struct mc_subled *mc_led_info; |
| 168 | struct led_classdev *led_cdev; |
| 169 | char name[32]; |
Colin Ian King | fb0f405 | 2022-10-20 22:07:31 +0100 | [diff] [blame] | 170 | int i; |
Dan Murphy | 92a8156 | 2020-07-16 13:20:01 -0500 | [diff] [blame] | 171 | int ret; |
Milo(Woogyom) Kim | 0e20234 | 2013-02-05 19:07:34 +0900 | [diff] [blame] | 172 | |
| 173 | if (chan >= max_channel) { |
| 174 | dev_err(dev, "invalid channel: %d / %d\n", chan, max_channel); |
| 175 | return -EINVAL; |
| 176 | } |
| 177 | |
| 178 | if (pdata->led_config[chan].led_current == 0) |
| 179 | return 0; |
| 180 | |
Milo(Woogyom) Kim | 0e20234 | 2013-02-05 19:07:34 +0900 | [diff] [blame] | 181 | if (pdata->led_config[chan].name) { |
| 182 | led->cdev.name = pdata->led_config[chan].name; |
| 183 | } else { |
| 184 | snprintf(name, sizeof(name), "%s:channel%d", |
| 185 | pdata->label ? : chip->cl->name, chan); |
| 186 | led->cdev.name = name; |
| 187 | } |
| 188 | |
Dan Murphy | 92a8156 | 2020-07-16 13:20:01 -0500 | [diff] [blame] | 189 | if (pdata->led_config[chan].num_colors > 1) { |
| 190 | mc_led_info = devm_kcalloc(dev, |
| 191 | pdata->led_config[chan].num_colors, |
| 192 | sizeof(*mc_led_info), GFP_KERNEL); |
| 193 | if (!mc_led_info) |
| 194 | return -ENOMEM; |
| 195 | |
| 196 | led_cdev = &led->mc_cdev.led_cdev; |
| 197 | led_cdev->name = led->cdev.name; |
| 198 | led_cdev->brightness_set_blocking = lp55xx_set_mc_brightness; |
| 199 | led->mc_cdev.num_colors = pdata->led_config[chan].num_colors; |
| 200 | for (i = 0; i < led->mc_cdev.num_colors; i++) { |
| 201 | mc_led_info[i].color_index = |
| 202 | pdata->led_config[chan].color_id[i]; |
| 203 | mc_led_info[i].channel = |
| 204 | pdata->led_config[chan].output_num[i]; |
Dan Murphy | 92a8156 | 2020-07-16 13:20:01 -0500 | [diff] [blame] | 205 | } |
| 206 | |
| 207 | led->mc_cdev.subled_info = mc_led_info; |
| 208 | } else { |
| 209 | led->cdev.brightness_set_blocking = lp55xx_set_brightness; |
| 210 | } |
| 211 | |
| 212 | led->cdev.groups = lp55xx_led_groups; |
| 213 | led->cdev.default_trigger = pdata->led_config[chan].default_trigger; |
| 214 | led->led_current = pdata->led_config[chan].led_current; |
| 215 | led->max_current = pdata->led_config[chan].max_current; |
| 216 | led->chan_nr = pdata->led_config[chan].chan_nr; |
| 217 | |
| 218 | if (led->chan_nr >= max_channel) { |
| 219 | dev_err(dev, "Use channel numbers between 0 and %d\n", |
| 220 | max_channel - 1); |
| 221 | return -EINVAL; |
| 222 | } |
| 223 | |
| 224 | if (pdata->led_config[chan].num_colors > 1) |
| 225 | ret = devm_led_classdev_multicolor_register(dev, &led->mc_cdev); |
| 226 | else |
| 227 | ret = devm_led_classdev_register(dev, &led->cdev); |
| 228 | |
Milo(Woogyom) Kim | 0e20234 | 2013-02-05 19:07:34 +0900 | [diff] [blame] | 229 | if (ret) { |
| 230 | dev_err(dev, "led register err: %d\n", ret); |
| 231 | return ret; |
| 232 | } |
| 233 | |
Milo(Woogyom) Kim | 9e9b3db | 2013-02-05 19:06:27 +0900 | [diff] [blame] | 234 | return 0; |
| 235 | } |
| 236 | |
Milo(Woogyom) Kim | 10c06d1 | 2013-02-05 19:17:20 +0900 | [diff] [blame] | 237 | static void lp55xx_firmware_loaded(const struct firmware *fw, void *context) |
| 238 | { |
| 239 | struct lp55xx_chip *chip = context; |
| 240 | struct device *dev = &chip->cl->dev; |
Milo Kim | 93ad8a1 | 2013-11-20 22:14:34 -0800 | [diff] [blame] | 241 | enum lp55xx_engine_index idx = chip->engine_idx; |
Milo(Woogyom) Kim | 10c06d1 | 2013-02-05 19:17:20 +0900 | [diff] [blame] | 242 | |
| 243 | if (!fw) { |
| 244 | dev_err(dev, "firmware request failed\n"); |
Michal Kazior | 5ddb086 | 2019-02-11 10:29:27 +0100 | [diff] [blame] | 245 | return; |
Milo(Woogyom) Kim | 10c06d1 | 2013-02-05 19:17:20 +0900 | [diff] [blame] | 246 | } |
| 247 | |
| 248 | /* handling firmware data is chip dependent */ |
| 249 | mutex_lock(&chip->lock); |
| 250 | |
Milo Kim | 93ad8a1 | 2013-11-20 22:14:34 -0800 | [diff] [blame] | 251 | chip->engines[idx - 1].mode = LP55XX_ENGINE_LOAD; |
Milo(Woogyom) Kim | 10c06d1 | 2013-02-05 19:17:20 +0900 | [diff] [blame] | 252 | chip->fw = fw; |
| 253 | if (chip->cfg->firmware_cb) |
| 254 | chip->cfg->firmware_cb(chip); |
| 255 | |
| 256 | mutex_unlock(&chip->lock); |
| 257 | |
Milo(Woogyom) Kim | 10c06d1 | 2013-02-05 19:17:20 +0900 | [diff] [blame] | 258 | /* firmware should be released for other channel use */ |
| 259 | release_firmware(chip->fw); |
Michal Kazior | 5ddb086 | 2019-02-11 10:29:27 +0100 | [diff] [blame] | 260 | chip->fw = NULL; |
Milo(Woogyom) Kim | 10c06d1 | 2013-02-05 19:17:20 +0900 | [diff] [blame] | 261 | } |
| 262 | |
| 263 | static int lp55xx_request_firmware(struct lp55xx_chip *chip) |
| 264 | { |
| 265 | const char *name = chip->cl->name; |
| 266 | struct device *dev = &chip->cl->dev; |
| 267 | |
Milo Kim | b678932 | 2015-06-28 17:39:14 -0700 | [diff] [blame] | 268 | return request_firmware_nowait(THIS_MODULE, false, name, dev, |
Milo(Woogyom) Kim | 10c06d1 | 2013-02-05 19:17:20 +0900 | [diff] [blame] | 269 | GFP_KERNEL, chip, lp55xx_firmware_loaded); |
| 270 | } |
| 271 | |
Dan Murphy | 7e6f7f3 | 2020-07-13 10:45:29 -0500 | [diff] [blame] | 272 | static ssize_t select_engine_show(struct device *dev, |
Milo(Woogyom) Kim | 10c06d1 | 2013-02-05 19:17:20 +0900 | [diff] [blame] | 273 | struct device_attribute *attr, |
| 274 | char *buf) |
| 275 | { |
| 276 | struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev)); |
| 277 | struct lp55xx_chip *chip = led->chip; |
| 278 | |
| 279 | return sprintf(buf, "%d\n", chip->engine_idx); |
| 280 | } |
| 281 | |
Dan Murphy | 7e6f7f3 | 2020-07-13 10:45:29 -0500 | [diff] [blame] | 282 | static ssize_t select_engine_store(struct device *dev, |
Milo(Woogyom) Kim | 10c06d1 | 2013-02-05 19:17:20 +0900 | [diff] [blame] | 283 | struct device_attribute *attr, |
| 284 | const char *buf, size_t len) |
| 285 | { |
| 286 | struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev)); |
| 287 | struct lp55xx_chip *chip = led->chip; |
| 288 | unsigned long val; |
| 289 | int ret; |
| 290 | |
| 291 | if (kstrtoul(buf, 0, &val)) |
| 292 | return -EINVAL; |
| 293 | |
| 294 | /* select the engine to be run */ |
| 295 | |
| 296 | switch (val) { |
| 297 | case LP55XX_ENGINE_1: |
| 298 | case LP55XX_ENGINE_2: |
| 299 | case LP55XX_ENGINE_3: |
| 300 | mutex_lock(&chip->lock); |
| 301 | chip->engine_idx = val; |
| 302 | ret = lp55xx_request_firmware(chip); |
| 303 | mutex_unlock(&chip->lock); |
| 304 | break; |
| 305 | default: |
| 306 | dev_err(dev, "%lu: invalid engine index. (1, 2, 3)\n", val); |
| 307 | return -EINVAL; |
| 308 | } |
| 309 | |
| 310 | if (ret) { |
| 311 | dev_err(dev, "request firmware err: %d\n", ret); |
| 312 | return ret; |
| 313 | } |
| 314 | |
| 315 | return len; |
| 316 | } |
| 317 | |
| 318 | static inline void lp55xx_run_engine(struct lp55xx_chip *chip, bool start) |
| 319 | { |
| 320 | if (chip->cfg->run_engine) |
| 321 | chip->cfg->run_engine(chip, start); |
| 322 | } |
| 323 | |
Dan Murphy | 7e6f7f3 | 2020-07-13 10:45:29 -0500 | [diff] [blame] | 324 | static ssize_t run_engine_store(struct device *dev, |
Milo(Woogyom) Kim | 10c06d1 | 2013-02-05 19:17:20 +0900 | [diff] [blame] | 325 | struct device_attribute *attr, |
| 326 | const char *buf, size_t len) |
| 327 | { |
| 328 | struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev)); |
| 329 | struct lp55xx_chip *chip = led->chip; |
| 330 | unsigned long val; |
| 331 | |
| 332 | if (kstrtoul(buf, 0, &val)) |
| 333 | return -EINVAL; |
| 334 | |
| 335 | /* run or stop the selected engine */ |
| 336 | |
| 337 | if (val <= 0) { |
| 338 | lp55xx_run_engine(chip, false); |
| 339 | return len; |
| 340 | } |
| 341 | |
| 342 | mutex_lock(&chip->lock); |
| 343 | lp55xx_run_engine(chip, true); |
| 344 | mutex_unlock(&chip->lock); |
| 345 | |
| 346 | return len; |
| 347 | } |
| 348 | |
Dan Murphy | 7e6f7f3 | 2020-07-13 10:45:29 -0500 | [diff] [blame] | 349 | static DEVICE_ATTR_RW(select_engine); |
| 350 | static DEVICE_ATTR_WO(run_engine); |
Milo(Woogyom) Kim | 10c06d1 | 2013-02-05 19:17:20 +0900 | [diff] [blame] | 351 | |
Milo(Woogyom) Kim | b3b6f81 | 2013-02-05 19:15:27 +0900 | [diff] [blame] | 352 | static struct attribute *lp55xx_engine_attributes[] = { |
Milo(Woogyom) Kim | 10c06d1 | 2013-02-05 19:17:20 +0900 | [diff] [blame] | 353 | &dev_attr_select_engine.attr, |
| 354 | &dev_attr_run_engine.attr, |
Milo(Woogyom) Kim | b3b6f81 | 2013-02-05 19:15:27 +0900 | [diff] [blame] | 355 | NULL, |
| 356 | }; |
| 357 | |
| 358 | static const struct attribute_group lp55xx_engine_attr_group = { |
| 359 | .attrs = lp55xx_engine_attributes, |
| 360 | }; |
| 361 | |
Milo(Woogyom) Kim | c93d08f | 2013-02-05 18:01:23 +0900 | [diff] [blame] | 362 | int lp55xx_write(struct lp55xx_chip *chip, u8 reg, u8 val) |
| 363 | { |
| 364 | return i2c_smbus_write_byte_data(chip->cl, reg, val); |
| 365 | } |
| 366 | EXPORT_SYMBOL_GPL(lp55xx_write); |
| 367 | |
| 368 | int lp55xx_read(struct lp55xx_chip *chip, u8 reg, u8 *val) |
| 369 | { |
| 370 | s32 ret; |
| 371 | |
| 372 | ret = i2c_smbus_read_byte_data(chip->cl, reg); |
| 373 | if (ret < 0) |
| 374 | return ret; |
| 375 | |
| 376 | *val = ret; |
| 377 | return 0; |
| 378 | } |
| 379 | EXPORT_SYMBOL_GPL(lp55xx_read); |
| 380 | |
| 381 | int lp55xx_update_bits(struct lp55xx_chip *chip, u8 reg, u8 mask, u8 val) |
| 382 | { |
| 383 | int ret; |
| 384 | u8 tmp; |
| 385 | |
| 386 | ret = lp55xx_read(chip, reg, &tmp); |
| 387 | if (ret) |
| 388 | return ret; |
| 389 | |
| 390 | tmp &= ~mask; |
| 391 | tmp |= val & mask; |
| 392 | |
| 393 | return lp55xx_write(chip, reg, tmp); |
| 394 | } |
| 395 | EXPORT_SYMBOL_GPL(lp55xx_update_bits); |
| 396 | |
Kim, Milo | 53b4192 | 2013-03-20 17:37:00 -0700 | [diff] [blame] | 397 | bool lp55xx_is_extclk_used(struct lp55xx_chip *chip) |
| 398 | { |
| 399 | struct clk *clk; |
| 400 | int err; |
| 401 | |
| 402 | clk = devm_clk_get(&chip->cl->dev, "32k_clk"); |
| 403 | if (IS_ERR(clk)) |
| 404 | goto use_internal_clk; |
| 405 | |
| 406 | err = clk_prepare_enable(clk); |
| 407 | if (err) |
| 408 | goto use_internal_clk; |
| 409 | |
| 410 | if (clk_get_rate(clk) != LP55XX_CLK_32K) { |
| 411 | clk_disable_unprepare(clk); |
| 412 | goto use_internal_clk; |
| 413 | } |
| 414 | |
| 415 | dev_info(&chip->cl->dev, "%dHz external clock used\n", LP55XX_CLK_32K); |
| 416 | |
| 417 | chip->clk = clk; |
| 418 | return true; |
| 419 | |
| 420 | use_internal_clk: |
| 421 | dev_info(&chip->cl->dev, "internal clock used\n"); |
| 422 | return false; |
| 423 | } |
| 424 | EXPORT_SYMBOL_GPL(lp55xx_is_extclk_used); |
| 425 | |
Milo(Woogyom) Kim | a85908d | 2013-02-05 18:07:20 +0900 | [diff] [blame] | 426 | int lp55xx_init_device(struct lp55xx_chip *chip) |
| 427 | { |
| 428 | struct lp55xx_platform_data *pdata; |
Milo(Woogyom) Kim | 48068d5 | 2013-02-05 18:08:49 +0900 | [diff] [blame] | 429 | struct lp55xx_device_config *cfg; |
Milo(Woogyom) Kim | a85908d | 2013-02-05 18:07:20 +0900 | [diff] [blame] | 430 | struct device *dev = &chip->cl->dev; |
| 431 | int ret = 0; |
| 432 | |
| 433 | WARN_ON(!chip); |
| 434 | |
| 435 | pdata = chip->pdata; |
Milo(Woogyom) Kim | 48068d5 | 2013-02-05 18:08:49 +0900 | [diff] [blame] | 436 | cfg = chip->cfg; |
Milo(Woogyom) Kim | a85908d | 2013-02-05 18:07:20 +0900 | [diff] [blame] | 437 | |
Milo(Woogyom) Kim | 48068d5 | 2013-02-05 18:08:49 +0900 | [diff] [blame] | 438 | if (!pdata || !cfg) |
Milo(Woogyom) Kim | a85908d | 2013-02-05 18:07:20 +0900 | [diff] [blame] | 439 | return -EINVAL; |
| 440 | |
Linus Walleij | ac219bf | 2020-06-27 00:40:11 +0200 | [diff] [blame] | 441 | if (pdata->enable_gpiod) { |
Merlijn Wajer | 9e87a8d | 2021-12-12 23:40:07 +0100 | [diff] [blame] | 442 | gpiod_direction_output(pdata->enable_gpiod, 0); |
| 443 | |
Linus Walleij | ac219bf | 2020-06-27 00:40:11 +0200 | [diff] [blame] | 444 | gpiod_set_consumer_name(pdata->enable_gpiod, "LP55xx enable"); |
Stefan Eichenberger | 7c97701 | 2023-09-18 16:32:38 +0200 | [diff] [blame] | 445 | gpiod_set_value_cansleep(pdata->enable_gpiod, 0); |
Milo(Woogyom) Kim | a85908d | 2013-02-05 18:07:20 +0900 | [diff] [blame] | 446 | usleep_range(1000, 2000); /* Keep enable down at least 1ms */ |
Stefan Eichenberger | 7c97701 | 2023-09-18 16:32:38 +0200 | [diff] [blame] | 447 | gpiod_set_value_cansleep(pdata->enable_gpiod, 1); |
Milo(Woogyom) Kim | a85908d | 2013-02-05 18:07:20 +0900 | [diff] [blame] | 448 | usleep_range(1000, 2000); /* 500us abs min. */ |
| 449 | } |
| 450 | |
Milo(Woogyom) Kim | 48068d5 | 2013-02-05 18:08:49 +0900 | [diff] [blame] | 451 | lp55xx_reset_device(chip); |
| 452 | |
| 453 | /* |
| 454 | * Exact value is not available. 10 - 20ms |
| 455 | * appears to be enough for reset. |
| 456 | */ |
| 457 | usleep_range(10000, 20000); |
| 458 | |
Milo(Woogyom) Kim | e3a700d | 2013-02-05 18:09:56 +0900 | [diff] [blame] | 459 | ret = lp55xx_detect_device(chip); |
| 460 | if (ret) { |
| 461 | dev_err(dev, "device detection err: %d\n", ret); |
| 462 | goto err; |
| 463 | } |
| 464 | |
Milo(Woogyom) Kim | ffbdccd | 2013-02-05 18:57:36 +0900 | [diff] [blame] | 465 | /* chip specific initialization */ |
| 466 | ret = lp55xx_post_init_device(chip); |
Milo(Woogyom) Kim | 22ebeb4 | 2013-02-05 18:58:35 +0900 | [diff] [blame] | 467 | if (ret) { |
| 468 | dev_err(dev, "post init device err: %d\n", ret); |
| 469 | goto err_post_init; |
| 470 | } |
Milo(Woogyom) Kim | ffbdccd | 2013-02-05 18:57:36 +0900 | [diff] [blame] | 471 | |
| 472 | return 0; |
| 473 | |
Milo(Woogyom) Kim | 22ebeb4 | 2013-02-05 18:58:35 +0900 | [diff] [blame] | 474 | err_post_init: |
Milo(Woogyom) Kim | 6ce6176 | 2013-02-05 19:03:02 +0900 | [diff] [blame] | 475 | lp55xx_deinit_device(chip); |
Milo(Woogyom) Kim | a85908d | 2013-02-05 18:07:20 +0900 | [diff] [blame] | 476 | err: |
| 477 | return ret; |
| 478 | } |
| 479 | EXPORT_SYMBOL_GPL(lp55xx_init_device); |
| 480 | |
Milo(Woogyom) Kim | 6ce6176 | 2013-02-05 19:03:02 +0900 | [diff] [blame] | 481 | void lp55xx_deinit_device(struct lp55xx_chip *chip) |
| 482 | { |
| 483 | struct lp55xx_platform_data *pdata = chip->pdata; |
| 484 | |
Kim, Milo | 53b4192 | 2013-03-20 17:37:00 -0700 | [diff] [blame] | 485 | if (chip->clk) |
| 486 | clk_disable_unprepare(chip->clk); |
| 487 | |
Linus Walleij | ac219bf | 2020-06-27 00:40:11 +0200 | [diff] [blame] | 488 | if (pdata->enable_gpiod) |
| 489 | gpiod_set_value(pdata->enable_gpiod, 0); |
Milo(Woogyom) Kim | 6ce6176 | 2013-02-05 19:03:02 +0900 | [diff] [blame] | 490 | } |
| 491 | EXPORT_SYMBOL_GPL(lp55xx_deinit_device); |
| 492 | |
Milo(Woogyom) Kim | 9e9b3db | 2013-02-05 19:06:27 +0900 | [diff] [blame] | 493 | int lp55xx_register_leds(struct lp55xx_led *led, struct lp55xx_chip *chip) |
| 494 | { |
| 495 | struct lp55xx_platform_data *pdata = chip->pdata; |
| 496 | struct lp55xx_device_config *cfg = chip->cfg; |
| 497 | int num_channels = pdata->num_channels; |
| 498 | struct lp55xx_led *each; |
| 499 | u8 led_current; |
| 500 | int ret; |
| 501 | int i; |
| 502 | |
Andrew Lunn | 95b2af6 | 2015-08-20 12:22:57 +0200 | [diff] [blame] | 503 | if (!cfg->brightness_fn) { |
Milo(Woogyom) Kim | 9e9b3db | 2013-02-05 19:06:27 +0900 | [diff] [blame] | 504 | dev_err(&chip->cl->dev, "empty brightness configuration\n"); |
| 505 | return -EINVAL; |
| 506 | } |
| 507 | |
| 508 | for (i = 0; i < num_channels; i++) { |
| 509 | |
| 510 | /* do not initialize channels that are not connected */ |
| 511 | if (pdata->led_config[i].led_current == 0) |
| 512 | continue; |
| 513 | |
| 514 | led_current = pdata->led_config[i].led_current; |
| 515 | each = led + i; |
| 516 | ret = lp55xx_init_led(each, chip, i); |
| 517 | if (ret) |
| 518 | goto err_init_led; |
| 519 | |
Milo(Woogyom) Kim | 9e9b3db | 2013-02-05 19:06:27 +0900 | [diff] [blame] | 520 | chip->num_leds++; |
| 521 | each->chip = chip; |
| 522 | |
| 523 | /* setting led current at each channel */ |
| 524 | if (cfg->set_led_current) |
| 525 | cfg->set_led_current(each, led_current); |
| 526 | } |
| 527 | |
| 528 | return 0; |
| 529 | |
| 530 | err_init_led: |
Milo(Woogyom) Kim | 9e9b3db | 2013-02-05 19:06:27 +0900 | [diff] [blame] | 531 | return ret; |
| 532 | } |
| 533 | EXPORT_SYMBOL_GPL(lp55xx_register_leds); |
| 534 | |
Milo(Woogyom) Kim | b3b6f81 | 2013-02-05 19:15:27 +0900 | [diff] [blame] | 535 | int lp55xx_register_sysfs(struct lp55xx_chip *chip) |
| 536 | { |
| 537 | struct device *dev = &chip->cl->dev; |
Milo(Woogyom) Kim | 240085e | 2013-02-05 19:20:01 +0900 | [diff] [blame] | 538 | struct lp55xx_device_config *cfg = chip->cfg; |
| 539 | int ret; |
Milo(Woogyom) Kim | b3b6f81 | 2013-02-05 19:15:27 +0900 | [diff] [blame] | 540 | |
Milo(Woogyom) Kim | 240085e | 2013-02-05 19:20:01 +0900 | [diff] [blame] | 541 | if (!cfg->run_engine || !cfg->firmware_cb) |
| 542 | goto dev_specific_attrs; |
| 543 | |
| 544 | ret = sysfs_create_group(&dev->kobj, &lp55xx_engine_attr_group); |
| 545 | if (ret) |
| 546 | return ret; |
| 547 | |
| 548 | dev_specific_attrs: |
| 549 | return cfg->dev_attr_group ? |
| 550 | sysfs_create_group(&dev->kobj, cfg->dev_attr_group) : 0; |
Milo(Woogyom) Kim | b3b6f81 | 2013-02-05 19:15:27 +0900 | [diff] [blame] | 551 | } |
| 552 | EXPORT_SYMBOL_GPL(lp55xx_register_sysfs); |
| 553 | |
Milo(Woogyom) Kim | ba6fa84 | 2013-02-05 19:23:04 +0900 | [diff] [blame] | 554 | void lp55xx_unregister_sysfs(struct lp55xx_chip *chip) |
| 555 | { |
| 556 | struct device *dev = &chip->cl->dev; |
| 557 | struct lp55xx_device_config *cfg = chip->cfg; |
| 558 | |
| 559 | if (cfg->dev_attr_group) |
| 560 | sysfs_remove_group(&dev->kobj, cfg->dev_attr_group); |
| 561 | |
| 562 | sysfs_remove_group(&dev->kobj, &lp55xx_engine_attr_group); |
| 563 | } |
| 564 | EXPORT_SYMBOL_GPL(lp55xx_unregister_sysfs); |
| 565 | |
Dan Murphy | 92a8156 | 2020-07-16 13:20:01 -0500 | [diff] [blame] | 566 | static int lp55xx_parse_common_child(struct device_node *np, |
| 567 | struct lp55xx_led_config *cfg, |
| 568 | int led_number, int *chan_nr) |
| 569 | { |
| 570 | int ret; |
| 571 | |
| 572 | of_property_read_string(np, "chan-name", |
| 573 | &cfg[led_number].name); |
| 574 | of_property_read_u8(np, "led-cur", |
| 575 | &cfg[led_number].led_current); |
| 576 | of_property_read_u8(np, "max-cur", |
| 577 | &cfg[led_number].max_current); |
| 578 | |
| 579 | ret = of_property_read_u32(np, "reg", chan_nr); |
| 580 | if (ret) |
| 581 | return ret; |
| 582 | |
| 583 | if (*chan_nr < 0 || *chan_nr > cfg->max_channel) |
| 584 | return -EINVAL; |
| 585 | |
| 586 | return 0; |
| 587 | } |
| 588 | |
| 589 | static int lp55xx_parse_multi_led_child(struct device_node *child, |
| 590 | struct lp55xx_led_config *cfg, |
| 591 | int child_number, int color_number) |
| 592 | { |
| 593 | int chan_nr, color_id, ret; |
| 594 | |
| 595 | ret = lp55xx_parse_common_child(child, cfg, child_number, &chan_nr); |
| 596 | if (ret) |
| 597 | return ret; |
| 598 | |
| 599 | ret = of_property_read_u32(child, "color", &color_id); |
| 600 | if (ret) |
| 601 | return ret; |
| 602 | |
| 603 | cfg[child_number].color_id[color_number] = color_id; |
| 604 | cfg[child_number].output_num[color_number] = chan_nr; |
| 605 | |
| 606 | return 0; |
| 607 | } |
| 608 | |
| 609 | static int lp55xx_parse_multi_led(struct device_node *np, |
| 610 | struct lp55xx_led_config *cfg, |
| 611 | int child_number) |
| 612 | { |
| 613 | struct device_node *child; |
| 614 | int num_colors = 0, ret; |
| 615 | |
Marek Behún | 99a013c | 2020-09-18 00:32:56 +0200 | [diff] [blame] | 616 | for_each_available_child_of_node(np, child) { |
Dan Murphy | 92a8156 | 2020-07-16 13:20:01 -0500 | [diff] [blame] | 617 | ret = lp55xx_parse_multi_led_child(child, cfg, child_number, |
| 618 | num_colors); |
Marek Behún | 2c67756 | 2020-09-18 00:32:57 +0200 | [diff] [blame] | 619 | if (ret) { |
| 620 | of_node_put(child); |
Dan Murphy | 92a8156 | 2020-07-16 13:20:01 -0500 | [diff] [blame] | 621 | return ret; |
Marek Behún | 2c67756 | 2020-09-18 00:32:57 +0200 | [diff] [blame] | 622 | } |
Dan Murphy | 92a8156 | 2020-07-16 13:20:01 -0500 | [diff] [blame] | 623 | num_colors++; |
| 624 | } |
| 625 | |
| 626 | cfg[child_number].num_colors = num_colors; |
| 627 | |
| 628 | return 0; |
| 629 | } |
| 630 | |
| 631 | static int lp55xx_parse_logical_led(struct device_node *np, |
| 632 | struct lp55xx_led_config *cfg, |
| 633 | int child_number) |
| 634 | { |
| 635 | int led_color, ret; |
| 636 | int chan_nr = 0; |
| 637 | |
| 638 | cfg[child_number].default_trigger = |
| 639 | of_get_property(np, "linux,default-trigger", NULL); |
| 640 | |
| 641 | ret = of_property_read_u32(np, "color", &led_color); |
| 642 | if (ret) |
| 643 | return ret; |
| 644 | |
Pavel Machek | 54212f5 | 2020-08-03 13:20:06 +0200 | [diff] [blame] | 645 | if (led_color == LED_COLOR_ID_RGB) |
Dan Murphy | 92a8156 | 2020-07-16 13:20:01 -0500 | [diff] [blame] | 646 | return lp55xx_parse_multi_led(np, cfg, child_number); |
| 647 | |
| 648 | ret = lp55xx_parse_common_child(np, cfg, child_number, &chan_nr); |
| 649 | if (ret < 0) |
| 650 | return ret; |
| 651 | |
| 652 | cfg[child_number].chan_nr = chan_nr; |
| 653 | |
| 654 | return ret; |
| 655 | } |
| 656 | |
Milo Kim | ed133352 | 2015-08-24 16:09:55 +0900 | [diff] [blame] | 657 | struct lp55xx_platform_data *lp55xx_of_populate_pdata(struct device *dev, |
Dan Murphy | 92a8156 | 2020-07-16 13:20:01 -0500 | [diff] [blame] | 658 | struct device_node *np, |
| 659 | struct lp55xx_chip *chip) |
Linus Walleij | 7542a04b | 2013-04-23 04:52:59 -0700 | [diff] [blame] | 660 | { |
Kim, Milo | 2dac912 | 2013-05-07 00:14:48 -0700 | [diff] [blame] | 661 | struct device_node *child; |
Linus Walleij | 7542a04b | 2013-04-23 04:52:59 -0700 | [diff] [blame] | 662 | struct lp55xx_platform_data *pdata; |
Kim, Milo | 2dac912 | 2013-05-07 00:14:48 -0700 | [diff] [blame] | 663 | struct lp55xx_led_config *cfg; |
| 664 | int num_channels; |
| 665 | int i = 0; |
Dan Murphy | 92a8156 | 2020-07-16 13:20:01 -0500 | [diff] [blame] | 666 | int ret; |
Linus Walleij | 7542a04b | 2013-04-23 04:52:59 -0700 | [diff] [blame] | 667 | |
| 668 | pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL); |
| 669 | if (!pdata) |
Milo Kim | ed133352 | 2015-08-24 16:09:55 +0900 | [diff] [blame] | 670 | return ERR_PTR(-ENOMEM); |
Linus Walleij | 7542a04b | 2013-04-23 04:52:59 -0700 | [diff] [blame] | 671 | |
Marek Behún | 99a013c | 2020-09-18 00:32:56 +0200 | [diff] [blame] | 672 | num_channels = of_get_available_child_count(np); |
Kim, Milo | 2dac912 | 2013-05-07 00:14:48 -0700 | [diff] [blame] | 673 | if (num_channels == 0) { |
| 674 | dev_err(dev, "no LED channels\n"); |
Milo Kim | ed133352 | 2015-08-24 16:09:55 +0900 | [diff] [blame] | 675 | return ERR_PTR(-EINVAL); |
Kim, Milo | 2dac912 | 2013-05-07 00:14:48 -0700 | [diff] [blame] | 676 | } |
Linus Walleij | 7542a04b | 2013-04-23 04:52:59 -0700 | [diff] [blame] | 677 | |
Kees Cook | a86854d | 2018-06-12 14:07:58 -0700 | [diff] [blame] | 678 | cfg = devm_kcalloc(dev, num_channels, sizeof(*cfg), GFP_KERNEL); |
Kim, Milo | 2dac912 | 2013-05-07 00:14:48 -0700 | [diff] [blame] | 679 | if (!cfg) |
Milo Kim | ed133352 | 2015-08-24 16:09:55 +0900 | [diff] [blame] | 680 | return ERR_PTR(-ENOMEM); |
Linus Walleij | 7542a04b | 2013-04-23 04:52:59 -0700 | [diff] [blame] | 681 | |
Kim, Milo | 2dac912 | 2013-05-07 00:14:48 -0700 | [diff] [blame] | 682 | pdata->led_config = &cfg[0]; |
| 683 | pdata->num_channels = num_channels; |
Dan Murphy | 92a8156 | 2020-07-16 13:20:01 -0500 | [diff] [blame] | 684 | cfg->max_channel = chip->cfg->max_channel; |
Kim, Milo | 2dac912 | 2013-05-07 00:14:48 -0700 | [diff] [blame] | 685 | |
Marek Behún | 99a013c | 2020-09-18 00:32:56 +0200 | [diff] [blame] | 686 | for_each_available_child_of_node(np, child) { |
Dan Murphy | 92a8156 | 2020-07-16 13:20:01 -0500 | [diff] [blame] | 687 | ret = lp55xx_parse_logical_led(child, cfg, i); |
Marek Behún | 2c67756 | 2020-09-18 00:32:57 +0200 | [diff] [blame] | 688 | if (ret) { |
| 689 | of_node_put(child); |
Dan Murphy | 92a8156 | 2020-07-16 13:20:01 -0500 | [diff] [blame] | 690 | return ERR_PTR(-EINVAL); |
Marek Behún | 2c67756 | 2020-09-18 00:32:57 +0200 | [diff] [blame] | 691 | } |
Kim, Milo | 2dac912 | 2013-05-07 00:14:48 -0700 | [diff] [blame] | 692 | i++; |
Linus Walleij | 7542a04b | 2013-04-23 04:52:59 -0700 | [diff] [blame] | 693 | } |
Kim, Milo | 2dac912 | 2013-05-07 00:14:48 -0700 | [diff] [blame] | 694 | |
Maarten Zanders | 54a7bef | 2023-04-21 09:53:05 +0200 | [diff] [blame] | 695 | if (of_property_read_u32(np, "ti,charge-pump-mode", &pdata->charge_pump_mode)) |
| 696 | pdata->charge_pump_mode = LP55XX_CP_AUTO; |
| 697 | |
| 698 | if (pdata->charge_pump_mode > LP55XX_CP_AUTO) { |
| 699 | dev_err(dev, "invalid charge pump mode %d\n", pdata->charge_pump_mode); |
| 700 | return ERR_PTR(-EINVAL); |
| 701 | } |
| 702 | |
Kim, Milo | 2dac912 | 2013-05-07 00:14:48 -0700 | [diff] [blame] | 703 | of_property_read_string(np, "label", &pdata->label); |
| 704 | of_property_read_u8(np, "clock-mode", &pdata->clock_mode); |
| 705 | |
Linus Walleij | ac219bf | 2020-06-27 00:40:11 +0200 | [diff] [blame] | 706 | pdata->enable_gpiod = devm_gpiod_get_optional(dev, "enable", |
Merlijn Wajer | 9e87a8d | 2021-12-12 23:40:07 +0100 | [diff] [blame] | 707 | GPIOD_ASIS); |
Linus Walleij | ac219bf | 2020-06-27 00:40:11 +0200 | [diff] [blame] | 708 | if (IS_ERR(pdata->enable_gpiod)) |
| 709 | return ERR_CAST(pdata->enable_gpiod); |
Sebastian Reichel | 30dae2f | 2013-10-22 11:02:56 -0700 | [diff] [blame] | 710 | |
Kim, Milo | 33b3a56 | 2013-07-09 02:11:37 -0700 | [diff] [blame] | 711 | /* LP8501 specific */ |
| 712 | of_property_read_u8(np, "pwr-sel", (u8 *)&pdata->pwr_sel); |
| 713 | |
Milo Kim | ed133352 | 2015-08-24 16:09:55 +0900 | [diff] [blame] | 714 | return pdata; |
Linus Walleij | 7542a04b | 2013-04-23 04:52:59 -0700 | [diff] [blame] | 715 | } |
| 716 | EXPORT_SYMBOL_GPL(lp55xx_of_populate_pdata); |
| 717 | |
Milo(Woogyom) Kim | c93d08f | 2013-02-05 18:01:23 +0900 | [diff] [blame] | 718 | MODULE_AUTHOR("Milo Kim <milo.kim@ti.com>"); |
| 719 | MODULE_DESCRIPTION("LP55xx Common Driver"); |
| 720 | MODULE_LICENSE("GPL"); |