| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| Jan-Simon Möller | 3459 | 98.94% | 1 | 16.67% |
| Andrew Lunn | 18 | 0.51% | 1 | 16.67% |
| Arnd Bergmann | 14 | 0.40% | 1 | 16.67% |
| Thomas Gleixner | 2 | 0.06% | 1 | 16.67% |
| Dan Carpenter | 2 | 0.06% | 1 | 16.67% |
| Arvind Yadav | 1 | 0.03% | 1 | 16.67% |
| Total | 3496 | 6 |
// SPDX-License-Identifier: GPL-2.0-or-later /* * leds-blinkm.c * (c) Jan-Simon Möller (dl9pf@gmx.de) */ #include <linux/module.h> #include <linux/slab.h> #include <linux/jiffies.h> #include <linux/i2c.h> #include <linux/err.h> #include <linux/mutex.h> #include <linux/sysfs.h> #include <linux/printk.h> #include <linux/pm_runtime.h> #include <linux/leds.h> #include <linux/delay.h> /* Addresses to scan - BlinkM is on 0x09 by default*/ static const unsigned short normal_i2c[] = { 0x09, I2C_CLIENT_END }; static int blinkm_transfer_hw(struct i2c_client *client, int cmd); static int blinkm_test_run(struct i2c_client *client); struct blinkm_led { struct i2c_client *i2c_client; struct led_classdev led_cdev; int id; }; #define cdev_to_blmled(c) container_of(c, struct blinkm_led, led_cdev) struct blinkm_data { struct i2c_client *i2c_client; struct mutex update_lock; /* used for led class interface */ struct blinkm_led blinkm_leds[3]; /* used for "blinkm" sysfs interface */ u8 red; /* color red */ u8 green; /* color green */ u8 blue; /* color blue */ /* next values to use for transfer */ u8 next_red; /* color red */ u8 next_green; /* color green */ u8 next_blue; /* color blue */ /* internal use */ u8 args[7]; /* set of args for transmission */ u8 i2c_addr; /* i2c addr */ u8 fw_ver; /* firmware version */ /* used, but not from userspace */ u8 hue; /* HSB hue */ u8 saturation; /* HSB saturation */ u8 brightness; /* HSB brightness */ u8 next_hue; /* HSB hue */ u8 next_saturation; /* HSB saturation */ u8 next_brightness; /* HSB brightness */ /* currently unused / todo */ u8 fade_speed; /* fade speed 1 - 255 */ s8 time_adjust; /* time adjust -128 - 127 */ u8 fade:1; /* fade on = 1, off = 0 */ u8 rand:1; /* rand fade mode on = 1 */ u8 script_id; /* script ID */ u8 script_repeats; /* repeats of script */ u8 script_startline; /* line to start */ }; /* Colors */ #define RED 0 #define GREEN 1 #define BLUE 2 /* mapping command names to cmd chars - see datasheet */ #define BLM_GO_RGB 0 #define BLM_FADE_RGB 1 #define BLM_FADE_HSB 2 #define BLM_FADE_RAND_RGB 3 #define BLM_FADE_RAND_HSB 4 #define BLM_PLAY_SCRIPT 5 #define BLM_STOP_SCRIPT 6 #define BLM_SET_FADE_SPEED 7 #define BLM_SET_TIME_ADJ 8 #define BLM_GET_CUR_RGB 9 #define BLM_WRITE_SCRIPT_LINE 10 #define BLM_READ_SCRIPT_LINE 11 #define BLM_SET_SCRIPT_LR 12 /* Length & Repeats */ #define BLM_SET_ADDR 13 #define BLM_GET_ADDR 14 #define BLM_GET_FW_VER 15 #define BLM_SET_STARTUP_PARAM 16 /* BlinkM Commands * as extracted out of the datasheet: * * cmdchar = command (ascii) * cmdbyte = command in hex * nr_args = number of arguments (to send) * nr_ret = number of return values (to read) * dir = direction (0 = read, 1 = write, 2 = both) * */ static const struct { char cmdchar; u8 cmdbyte; u8 nr_args; u8 nr_ret; u8 dir:2; } blinkm_cmds[17] = { /* cmdchar, cmdbyte, nr_args, nr_ret, dir */ { 'n', 0x6e, 3, 0, 1}, { 'c', 0x63, 3, 0, 1}, { 'h', 0x68, 3, 0, 1}, { 'C', 0x43, 3, 0, 1}, { 'H', 0x48, 3, 0, 1}, { 'p', 0x70, 3, 0, 1}, { 'o', 0x6f, 0, 0, 1}, { 'f', 0x66, 1, 0, 1}, { 't', 0x74, 1, 0, 1}, { 'g', 0x67, 0, 3, 0}, { 'W', 0x57, 7, 0, 1}, { 'R', 0x52, 2, 5, 2}, { 'L', 0x4c, 3, 0, 1}, { 'A', 0x41, 4, 0, 1}, { 'a', 0x61, 0, 1, 0}, { 'Z', 0x5a, 0, 1, 0}, { 'B', 0x42, 5, 0, 1}, }; static ssize_t show_color_common(struct device *dev, char *buf, int color) { struct i2c_client *client; struct blinkm_data *data; int ret; client = to_i2c_client(dev); data = i2c_get_clientdata(client); ret = blinkm_transfer_hw(client, BLM_GET_CUR_RGB); if (ret < 0) return ret; switch (color) { case RED: return scnprintf(buf, PAGE_SIZE, "%02X\n", data->red); case GREEN: return scnprintf(buf, PAGE_SIZE, "%02X\n", data->green); case BLUE: return scnprintf(buf, PAGE_SIZE, "%02X\n", data->blue); default: return -EINVAL; } return -EINVAL; } static int store_color_common(struct device *dev, const char *buf, int color) { struct i2c_client *client; struct blinkm_data *data; int ret; u8 value; client = to_i2c_client(dev); data = i2c_get_clientdata(client); ret = kstrtou8(buf, 10, &value); if (ret < 0) { dev_err(dev, "BlinkM: value too large!\n"); return ret; } switch (color) { case RED: data->next_red = value; break; case GREEN: data->next_green = value; break; case BLUE: data->next_blue = value; break; default: return -EINVAL; } dev_dbg(dev, "next_red = %d, next_green = %d, next_blue = %d\n", data->next_red, data->next_green, data->next_blue); /* if mode ... */ ret = blinkm_transfer_hw(client, BLM_GO_RGB); if (ret < 0) { dev_err(dev, "BlinkM: can't set RGB\n"); return ret; } return 0; } static ssize_t show_red(struct device *dev, struct device_attribute *attr, char *buf) { return show_color_common(dev, buf, RED); } static ssize_t store_red(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { int ret; ret = store_color_common(dev, buf, RED); if (ret < 0) return ret; return count; } static DEVICE_ATTR(red, S_IRUGO | S_IWUSR, show_red, store_red); static ssize_t show_green(struct device *dev, struct device_attribute *attr, char *buf) { return show_color_common(dev, buf, GREEN); } static ssize_t store_green(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { int ret; ret = store_color_common(dev, buf, GREEN); if (ret < 0) return ret; return count; } static DEVICE_ATTR(green, S_IRUGO | S_IWUSR, show_green, store_green); static ssize_t show_blue(struct device *dev, struct device_attribute *attr, char *buf) { return show_color_common(dev, buf, BLUE); } static ssize_t store_blue(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { int ret; ret = store_color_common(dev, buf, BLUE); if (ret < 0) return ret; return count; } static DEVICE_ATTR(blue, S_IRUGO | S_IWUSR, show_blue, store_blue); static ssize_t show_test(struct device *dev, struct device_attribute *attr, char *buf) { return scnprintf(buf, PAGE_SIZE, "#Write into test to start test sequence!#\n"); } static ssize_t store_test(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { struct i2c_client *client; int ret; client = to_i2c_client(dev); /*test */ ret = blinkm_test_run(client); if (ret < 0) return ret; return count; } static DEVICE_ATTR(test, S_IRUGO | S_IWUSR, show_test, store_test); /* TODO: HSB, fade, timeadj, script ... */ static struct attribute *blinkm_attrs[] = { &dev_attr_red.attr, &dev_attr_green.attr, &dev_attr_blue.attr, &dev_attr_test.attr, NULL, }; static const struct attribute_group blinkm_group = { .name = "blinkm", .attrs = blinkm_attrs, }; static int blinkm_write(struct i2c_client *client, int cmd, u8 *arg) { int result; int i; int arglen = blinkm_cmds[cmd].nr_args; /* write out cmd to blinkm - always / default step */ result = i2c_smbus_write_byte(client, blinkm_cmds[cmd].cmdbyte); if (result < 0) return result; /* no args to write out */ if (arglen == 0) return 0; for (i = 0; i < arglen; i++) { /* repeat for arglen */ result = i2c_smbus_write_byte(client, arg[i]); if (result < 0) return result; } return 0; } static int blinkm_read(struct i2c_client *client, int cmd, u8 *arg) { int result; int i; int retlen = blinkm_cmds[cmd].nr_ret; for (i = 0; i < retlen; i++) { /* repeat for retlen */ result = i2c_smbus_read_byte(client); if (result < 0) return result; arg[i] = result; } return 0; } static int blinkm_transfer_hw(struct i2c_client *client, int cmd) { /* the protocol is simple but non-standard: * e.g. cmd 'g' (= 0x67) for "get device address" * - which defaults to 0x09 - would be the sequence: * a) write 0x67 to the device (byte write) * b) read the value (0x09) back right after (byte read) * * Watch out for "unfinished" sequences (i.e. not enough reads * or writes after a command. It will make the blinkM misbehave. * Sequence is key here. */ /* args / return are in private data struct */ struct blinkm_data *data = i2c_get_clientdata(client); /* We start hardware transfers which are not to be * mixed with other commands. Aquire a lock now. */ if (mutex_lock_interruptible(&data->update_lock) < 0) return -EAGAIN; /* switch cmd - usually write before reads */ switch (cmd) { case BLM_FADE_RAND_RGB: case BLM_GO_RGB: case BLM_FADE_RGB: data->args[0] = data->next_red; data->args[1] = data->next_green; data->args[2] = data->next_blue; blinkm_write(client, cmd, data->args); data->red = data->args[0]; data->green = data->args[1]; data->blue = data->args[2]; break; case BLM_FADE_HSB: case BLM_FADE_RAND_HSB: data->args[0] = data->next_hue; data->args[1] = data->next_saturation; data->args[2] = data->next_brightness; blinkm_write(client, cmd, data->args); data->hue = data->next_hue; data->saturation = data->next_saturation; data->brightness = data->next_brightness; break; case BLM_PLAY_SCRIPT: data->args[0] = data->script_id; data->args[1] = data->script_repeats; data->args[2] = data->script_startline; blinkm_write(client, cmd, data->args); break; case BLM_STOP_SCRIPT: blinkm_write(client, cmd, NULL); break; case BLM_GET_CUR_RGB: data->args[0] = data->red; data->args[1] = data->green; data->args[2] = data->blue; blinkm_write(client, cmd, NULL); blinkm_read(client, cmd, data->args); data->red = data->args[0]; data->green = data->args[1]; data->blue = data->args[2]; break; case BLM_GET_ADDR: data->args[0] = data->i2c_addr; blinkm_write(client, cmd, NULL); blinkm_read(client, cmd, data->args); data->i2c_addr = data->args[0]; break; case BLM_SET_TIME_ADJ: case BLM_SET_FADE_SPEED: case BLM_READ_SCRIPT_LINE: case BLM_WRITE_SCRIPT_LINE: case BLM_SET_SCRIPT_LR: case BLM_SET_ADDR: case BLM_GET_FW_VER: case BLM_SET_STARTUP_PARAM: dev_err(&client->dev, "BlinkM: cmd %d not implemented yet.\n", cmd); break; default: dev_err(&client->dev, "BlinkM: unknown command %d\n", cmd); mutex_unlock(&data->update_lock); return -EINVAL; } /* end switch(cmd) */ /* transfers done, unlock */ mutex_unlock(&data->update_lock); return 0; } static int blinkm_led_common_set(struct led_classdev *led_cdev, enum led_brightness value, int color) { /* led_brightness is 0, 127 or 255 - we just use it here as-is */ struct blinkm_led *led = cdev_to_blmled(led_cdev); struct blinkm_data *data = i2c_get_clientdata(led->i2c_client); switch (color) { case RED: /* bail out if there's no change */ if (data->next_red == (u8) value) return 0; data->next_red = (u8) value; break; case GREEN: /* bail out if there's no change */ if (data->next_green == (u8) value) return 0; data->next_green = (u8) value; break; case BLUE: /* bail out if there's no change */ if (data->next_blue == (u8) value) return 0; data->next_blue = (u8) value; break; default: dev_err(&led->i2c_client->dev, "BlinkM: unknown color.\n"); return -EINVAL; } blinkm_transfer_hw(led->i2c_client, BLM_GO_RGB); dev_dbg(&led->i2c_client->dev, "# DONE # next_red = %d, next_green = %d," " next_blue = %d\n", data->next_red, data->next_green, data->next_blue); return 0; } static int blinkm_led_red_set(struct led_classdev *led_cdev, enum led_brightness value) { return blinkm_led_common_set(led_cdev, value, RED); } static int blinkm_led_green_set(struct led_classdev *led_cdev, enum led_brightness value) { return blinkm_led_common_set(led_cdev, value, GREEN); } static int blinkm_led_blue_set(struct led_classdev *led_cdev, enum led_brightness value) { return blinkm_led_common_set(led_cdev, value, BLUE); } static void blinkm_init_hw(struct i2c_client *client) { int ret; ret = blinkm_transfer_hw(client, BLM_STOP_SCRIPT); ret = blinkm_transfer_hw(client, BLM_GO_RGB); } static int blinkm_test_run(struct i2c_client *client) { int ret; struct blinkm_data *data = i2c_get_clientdata(client); data->next_red = 0x01; data->next_green = 0x05; data->next_blue = 0x10; ret = blinkm_transfer_hw(client, BLM_GO_RGB); if (ret < 0) return ret; msleep(2000); data->next_red = 0x25; data->next_green = 0x10; data->next_blue = 0x31; ret = blinkm_transfer_hw(client, BLM_FADE_RGB); if (ret < 0) return ret; msleep(2000); data->next_hue = 0x50; data->next_saturation = 0x10; data->next_brightness = 0x20; ret = blinkm_transfer_hw(client, BLM_FADE_HSB); if (ret < 0) return ret; msleep(2000); return 0; } /* Return 0 if detection is successful, -ENODEV otherwise */ static int blinkm_detect(struct i2c_client *client, struct i2c_board_info *info) { struct i2c_adapter *adapter = client->adapter; int ret; int count = 99; u8 tmpargs[7]; if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA | I2C_FUNC_SMBUS_WRITE_BYTE)) return -ENODEV; /* Now, we do the remaining detection. Simple for now. */ /* We might need more guards to protect other i2c slaves */ /* make sure the blinkM is balanced (read/writes) */ while (count > 0) { ret = blinkm_write(client, BLM_GET_ADDR, NULL); if (ret) return ret; usleep_range(5000, 10000); ret = blinkm_read(client, BLM_GET_ADDR, tmpargs); if (ret) return ret; usleep_range(5000, 10000); if (tmpargs[0] == 0x09) count = 0; count--; } /* Step 1: Read BlinkM address back - cmd_char 'a' */ ret = blinkm_write(client, BLM_GET_ADDR, NULL); if (ret < 0) return ret; usleep_range(20000, 30000); /* allow a small delay */ ret = blinkm_read(client, BLM_GET_ADDR, tmpargs); if (ret < 0) return ret; if (tmpargs[0] != 0x09) { dev_err(&client->dev, "enodev DEV ADDR = 0x%02X\n", tmpargs[0]); return -ENODEV; } strlcpy(info->type, "blinkm", I2C_NAME_SIZE); return 0; } static int blinkm_probe(struct i2c_client *client, const struct i2c_device_id *id) { struct blinkm_data *data; struct blinkm_led *led[3]; int err, i; char blinkm_led_name[28]; data = devm_kzalloc(&client->dev, sizeof(struct blinkm_data), GFP_KERNEL); if (!data) { err = -ENOMEM; goto exit; } data->i2c_addr = 0x08; /* i2c addr - use fake addr of 0x08 initially (real is 0x09) */ data->fw_ver = 0xfe; /* firmware version - use fake until we read real value * (currently broken - BlinkM confused!) */ data->script_id = 0x01; data->i2c_client = client; i2c_set_clientdata(client, data); mutex_init(&data->update_lock); /* Register sysfs hooks */ err = sysfs_create_group(&client->dev.kobj, &blinkm_group); if (err < 0) { dev_err(&client->dev, "couldn't register sysfs group\n"); goto exit; } for (i = 0; i < 3; i++) { /* RED = 0, GREEN = 1, BLUE = 2 */ led[i] = &data->blinkm_leds[i]; led[i]->i2c_client = client; led[i]->id = i; led[i]->led_cdev.max_brightness = 255; led[i]->led_cdev.flags = LED_CORE_SUSPENDRESUME; switch (i) { case RED: snprintf(blinkm_led_name, sizeof(blinkm_led_name), "blinkm-%d-%d-red", client->adapter->nr, client->addr); led[i]->led_cdev.name = blinkm_led_name; led[i]->led_cdev.brightness_set_blocking = blinkm_led_red_set; err = led_classdev_register(&client->dev, &led[i]->led_cdev); if (err < 0) { dev_err(&client->dev, "couldn't register LED %s\n", led[i]->led_cdev.name); goto failred; } break; case GREEN: snprintf(blinkm_led_name, sizeof(blinkm_led_name), "blinkm-%d-%d-green", client->adapter->nr, client->addr); led[i]->led_cdev.name = blinkm_led_name; led[i]->led_cdev.brightness_set_blocking = blinkm_led_green_set; err = led_classdev_register(&client->dev, &led[i]->led_cdev); if (err < 0) { dev_err(&client->dev, "couldn't register LED %s\n", led[i]->led_cdev.name); goto failgreen; } break; case BLUE: snprintf(blinkm_led_name, sizeof(blinkm_led_name), "blinkm-%d-%d-blue", client->adapter->nr, client->addr); led[i]->led_cdev.name = blinkm_led_name; led[i]->led_cdev.brightness_set_blocking = blinkm_led_blue_set; err = led_classdev_register(&client->dev, &led[i]->led_cdev); if (err < 0) { dev_err(&client->dev, "couldn't register LED %s\n", led[i]->led_cdev.name); goto failblue; } break; } /* end switch */ } /* end for */ /* Initialize the blinkm */ blinkm_init_hw(client); return 0; failblue: led_classdev_unregister(&led[GREEN]->led_cdev); failgreen: led_classdev_unregister(&led[RED]->led_cdev); failred: sysfs_remove_group(&client->dev.kobj, &blinkm_group); exit: return err; } static int blinkm_remove(struct i2c_client *client) { struct blinkm_data *data = i2c_get_clientdata(client); int ret = 0; int i; /* make sure no workqueue entries are pending */ for (i = 0; i < 3; i++) led_classdev_unregister(&data->blinkm_leds[i].led_cdev); /* reset rgb */ data->next_red = 0x00; data->next_green = 0x00; data->next_blue = 0x00; ret = blinkm_transfer_hw(client, BLM_FADE_RGB); if (ret < 0) dev_err(&client->dev, "Failure in blinkm_remove ignored. Continuing.\n"); /* reset hsb */ data->next_hue = 0x00; data->next_saturation = 0x00; data->next_brightness = 0x00; ret = blinkm_transfer_hw(client, BLM_FADE_HSB); if (ret < 0) dev_err(&client->dev, "Failure in blinkm_remove ignored. Continuing.\n"); /* red fade to off */ data->next_red = 0xff; ret = blinkm_transfer_hw(client, BLM_GO_RGB); if (ret < 0) dev_err(&client->dev, "Failure in blinkm_remove ignored. Continuing.\n"); /* off */ data->next_red = 0x00; ret = blinkm_transfer_hw(client, BLM_FADE_RGB); if (ret < 0) dev_err(&client->dev, "Failure in blinkm_remove ignored. Continuing.\n"); sysfs_remove_group(&client->dev.kobj, &blinkm_group); return 0; } static const struct i2c_device_id blinkm_id[] = { {"blinkm", 0}, {} }; MODULE_DEVICE_TABLE(i2c, blinkm_id); /* This is the driver that will be inserted */ static struct i2c_driver blinkm_driver = { .class = I2C_CLASS_HWMON, .driver = { .name = "blinkm", }, .probe = blinkm_probe, .remove = blinkm_remove, .id_table = blinkm_id, .detect = blinkm_detect, .address_list = normal_i2c, }; module_i2c_driver(blinkm_driver); MODULE_AUTHOR("Jan-Simon Moeller <dl9pf@gmx.de>"); MODULE_DESCRIPTION("BlinkM RGB LED driver"); MODULE_LICENSE("GPL");
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