1b886d83cSThomas Gleixner // SPDX-License-Identifier: GPL-2.0-only 2e370d010SAndrew Lunn /* 3e370d010SAndrew Lunn * Copyright 2014 Belkin Inc. 4e370d010SAndrew Lunn * Copyright 2015 Andrew Lunn <andrew@lunn.ch> 5e370d010SAndrew Lunn */ 6e370d010SAndrew Lunn 7e370d010SAndrew Lunn #include <linux/i2c.h> 8e370d010SAndrew Lunn #include <linux/leds.h> 9e370d010SAndrew Lunn #include <linux/module.h> 10e370d010SAndrew Lunn #include <linux/of.h> 11e370d010SAndrew Lunn #include <linux/of_device.h> 12e370d010SAndrew Lunn #include <linux/regmap.h> 13e370d010SAndrew Lunn #include <linux/slab.h> 14e370d010SAndrew Lunn 15e370d010SAndrew Lunn #define TLC591XX_MAX_LEDS 16 16e370d010SAndrew Lunn 17e370d010SAndrew Lunn #define TLC591XX_REG_MODE1 0x00 18e370d010SAndrew Lunn #define MODE1_RESPON_ADDR_MASK 0xF0 19e370d010SAndrew Lunn #define MODE1_NORMAL_MODE (0 << 4) 20e370d010SAndrew Lunn #define MODE1_SPEED_MODE (1 << 4) 21e370d010SAndrew Lunn 22e370d010SAndrew Lunn #define TLC591XX_REG_MODE2 0x01 23e370d010SAndrew Lunn #define MODE2_DIM (0 << 5) 24e370d010SAndrew Lunn #define MODE2_BLINK (1 << 5) 25e370d010SAndrew Lunn #define MODE2_OCH_STOP (0 << 3) 26e370d010SAndrew Lunn #define MODE2_OCH_ACK (1 << 3) 27e370d010SAndrew Lunn 28e370d010SAndrew Lunn #define TLC591XX_REG_PWM(x) (0x02 + (x)) 29e370d010SAndrew Lunn 30e370d010SAndrew Lunn #define TLC591XX_REG_GRPPWM 0x12 31e370d010SAndrew Lunn #define TLC591XX_REG_GRPFREQ 0x13 32e370d010SAndrew Lunn 33e370d010SAndrew Lunn /* LED Driver Output State, determine the source that drives LED outputs */ 34e370d010SAndrew Lunn #define LEDOUT_OFF 0x0 /* Output LOW */ 35e370d010SAndrew Lunn #define LEDOUT_ON 0x1 /* Output HI-Z */ 36e370d010SAndrew Lunn #define LEDOUT_DIM 0x2 /* Dimming */ 37e370d010SAndrew Lunn #define LEDOUT_BLINK 0x3 /* Blinking */ 38e370d010SAndrew Lunn #define LEDOUT_MASK 0x3 39e370d010SAndrew Lunn 40e370d010SAndrew Lunn #define ldev_to_led(c) container_of(c, struct tlc591xx_led, ldev) 41e370d010SAndrew Lunn 42e370d010SAndrew Lunn struct tlc591xx_led { 43e370d010SAndrew Lunn bool active; 44e370d010SAndrew Lunn unsigned int led_no; 45e370d010SAndrew Lunn struct led_classdev ldev; 46e370d010SAndrew Lunn struct tlc591xx_priv *priv; 47e370d010SAndrew Lunn }; 48e370d010SAndrew Lunn 49e370d010SAndrew Lunn struct tlc591xx_priv { 50e370d010SAndrew Lunn struct tlc591xx_led leds[TLC591XX_MAX_LEDS]; 51e370d010SAndrew Lunn struct regmap *regmap; 52e370d010SAndrew Lunn unsigned int reg_ledout_offset; 53e370d010SAndrew Lunn }; 54e370d010SAndrew Lunn 55e370d010SAndrew Lunn struct tlc591xx { 56e370d010SAndrew Lunn unsigned int max_leds; 57e370d010SAndrew Lunn unsigned int reg_ledout_offset; 58e370d010SAndrew Lunn }; 59e370d010SAndrew Lunn 60e370d010SAndrew Lunn static const struct tlc591xx tlc59116 = { 61e370d010SAndrew Lunn .max_leds = 16, 62e370d010SAndrew Lunn .reg_ledout_offset = 0x14, 63e370d010SAndrew Lunn }; 64e370d010SAndrew Lunn 65e370d010SAndrew Lunn static const struct tlc591xx tlc59108 = { 66e370d010SAndrew Lunn .max_leds = 8, 67e370d010SAndrew Lunn .reg_ledout_offset = 0x0c, 68e370d010SAndrew Lunn }; 69e370d010SAndrew Lunn 70e370d010SAndrew Lunn static int 71e370d010SAndrew Lunn tlc591xx_set_mode(struct regmap *regmap, u8 mode) 72e370d010SAndrew Lunn { 73e370d010SAndrew Lunn int err; 74e370d010SAndrew Lunn u8 val; 75e370d010SAndrew Lunn 76e370d010SAndrew Lunn err = regmap_write(regmap, TLC591XX_REG_MODE1, MODE1_NORMAL_MODE); 77e370d010SAndrew Lunn if (err) 78e370d010SAndrew Lunn return err; 79e370d010SAndrew Lunn 80e370d010SAndrew Lunn val = MODE2_OCH_STOP | mode; 81e370d010SAndrew Lunn 82e370d010SAndrew Lunn return regmap_write(regmap, TLC591XX_REG_MODE2, val); 83e370d010SAndrew Lunn } 84e370d010SAndrew Lunn 85e370d010SAndrew Lunn static int 86e370d010SAndrew Lunn tlc591xx_set_ledout(struct tlc591xx_priv *priv, struct tlc591xx_led *led, 87e370d010SAndrew Lunn u8 val) 88e370d010SAndrew Lunn { 89e370d010SAndrew Lunn unsigned int i = (led->led_no % 4) * 2; 90e370d010SAndrew Lunn unsigned int mask = LEDOUT_MASK << i; 91e370d010SAndrew Lunn unsigned int addr = priv->reg_ledout_offset + (led->led_no >> 2); 92e370d010SAndrew Lunn 93e370d010SAndrew Lunn val = val << i; 94e370d010SAndrew Lunn 95e370d010SAndrew Lunn return regmap_update_bits(priv->regmap, addr, mask, val); 96e370d010SAndrew Lunn } 97e370d010SAndrew Lunn 98e370d010SAndrew Lunn static int 99e370d010SAndrew Lunn tlc591xx_set_pwm(struct tlc591xx_priv *priv, struct tlc591xx_led *led, 100e370d010SAndrew Lunn u8 brightness) 101e370d010SAndrew Lunn { 102e370d010SAndrew Lunn u8 pwm = TLC591XX_REG_PWM(led->led_no); 103e370d010SAndrew Lunn 104e370d010SAndrew Lunn return regmap_write(priv->regmap, pwm, brightness); 105e370d010SAndrew Lunn } 106e370d010SAndrew Lunn 107d890389fSAndrew Lunn static int 108d890389fSAndrew Lunn tlc591xx_brightness_set(struct led_classdev *led_cdev, 109d890389fSAndrew Lunn enum led_brightness brightness) 110e370d010SAndrew Lunn { 111d890389fSAndrew Lunn struct tlc591xx_led *led = ldev_to_led(led_cdev); 112e370d010SAndrew Lunn struct tlc591xx_priv *priv = led->priv; 113e370d010SAndrew Lunn int err; 114e370d010SAndrew Lunn 115e370d010SAndrew Lunn switch (brightness) { 116e370d010SAndrew Lunn case 0: 117e370d010SAndrew Lunn err = tlc591xx_set_ledout(priv, led, LEDOUT_OFF); 118e370d010SAndrew Lunn break; 119e370d010SAndrew Lunn case LED_FULL: 120e370d010SAndrew Lunn err = tlc591xx_set_ledout(priv, led, LEDOUT_ON); 121e370d010SAndrew Lunn break; 122e370d010SAndrew Lunn default: 123e370d010SAndrew Lunn err = tlc591xx_set_ledout(priv, led, LEDOUT_DIM); 124e370d010SAndrew Lunn if (!err) 125e370d010SAndrew Lunn err = tlc591xx_set_pwm(priv, led, brightness); 126e370d010SAndrew Lunn } 127e370d010SAndrew Lunn 128d890389fSAndrew Lunn return err; 129e370d010SAndrew Lunn } 130e370d010SAndrew Lunn 131e370d010SAndrew Lunn static const struct regmap_config tlc591xx_regmap = { 132e370d010SAndrew Lunn .reg_bits = 8, 133e370d010SAndrew Lunn .val_bits = 8, 134e370d010SAndrew Lunn .max_register = 0x1e, 135e370d010SAndrew Lunn }; 136e370d010SAndrew Lunn 137e370d010SAndrew Lunn static const struct of_device_id of_tlc591xx_leds_match[] = { 138e370d010SAndrew Lunn { .compatible = "ti,tlc59116", 139e370d010SAndrew Lunn .data = &tlc59116 }, 140e370d010SAndrew Lunn { .compatible = "ti,tlc59108", 141e370d010SAndrew Lunn .data = &tlc59108 }, 142e370d010SAndrew Lunn {}, 143e370d010SAndrew Lunn }; 144e370d010SAndrew Lunn MODULE_DEVICE_TABLE(of, of_tlc591xx_leds_match); 145e370d010SAndrew Lunn 146e370d010SAndrew Lunn static int 147e370d010SAndrew Lunn tlc591xx_probe(struct i2c_client *client, 148e370d010SAndrew Lunn const struct i2c_device_id *id) 149e370d010SAndrew Lunn { 150e370d010SAndrew Lunn struct device_node *np = client->dev.of_node, *child; 151e370d010SAndrew Lunn struct device *dev = &client->dev; 152e370d010SAndrew Lunn const struct of_device_id *match; 153e370d010SAndrew Lunn const struct tlc591xx *tlc591xx; 154e370d010SAndrew Lunn struct tlc591xx_priv *priv; 155e370d010SAndrew Lunn int err, count, reg; 156e370d010SAndrew Lunn 157e370d010SAndrew Lunn match = of_match_device(of_tlc591xx_leds_match, dev); 158e370d010SAndrew Lunn if (!match) 159e370d010SAndrew Lunn return -ENODEV; 160e370d010SAndrew Lunn 161e370d010SAndrew Lunn tlc591xx = match->data; 162e370d010SAndrew Lunn if (!np) 163e370d010SAndrew Lunn return -ENODEV; 164e370d010SAndrew Lunn 165e370d010SAndrew Lunn count = of_get_child_count(np); 166e370d010SAndrew Lunn if (!count || count > tlc591xx->max_leds) 167e370d010SAndrew Lunn return -EINVAL; 168e370d010SAndrew Lunn 169e370d010SAndrew Lunn priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); 170e370d010SAndrew Lunn if (!priv) 171e370d010SAndrew Lunn return -ENOMEM; 172e370d010SAndrew Lunn 173e370d010SAndrew Lunn priv->regmap = devm_regmap_init_i2c(client, &tlc591xx_regmap); 174e370d010SAndrew Lunn if (IS_ERR(priv->regmap)) { 175e370d010SAndrew Lunn err = PTR_ERR(priv->regmap); 176e370d010SAndrew Lunn dev_err(dev, "Failed to allocate register map: %d\n", err); 177e370d010SAndrew Lunn return err; 178e370d010SAndrew Lunn } 179e370d010SAndrew Lunn priv->reg_ledout_offset = tlc591xx->reg_ledout_offset; 180e370d010SAndrew Lunn 181e370d010SAndrew Lunn i2c_set_clientdata(client, priv); 182e370d010SAndrew Lunn 183*1ab4531aSJean-Jacques Hiblot err = tlc591xx_set_mode(priv->regmap, MODE2_DIM); 184*1ab4531aSJean-Jacques Hiblot if (err < 0) 185*1ab4531aSJean-Jacques Hiblot return err; 186*1ab4531aSJean-Jacques Hiblot 187e370d010SAndrew Lunn for_each_child_of_node(np, child) { 188*1ab4531aSJean-Jacques Hiblot struct tlc591xx_led *led; 189*1ab4531aSJean-Jacques Hiblot 190e370d010SAndrew Lunn err = of_property_read_u32(child, "reg", ®); 191c6872911SJulia Lawall if (err) { 192c6872911SJulia Lawall of_node_put(child); 193e370d010SAndrew Lunn return err; 194c6872911SJulia Lawall } 1951055790bSJulia Lawall if (reg < 0 || reg >= tlc591xx->max_leds || 196c6872911SJulia Lawall priv->leds[reg].active) { 197c6872911SJulia Lawall of_node_put(child); 198e370d010SAndrew Lunn return -EINVAL; 199c6872911SJulia Lawall } 200*1ab4531aSJean-Jacques Hiblot led = &priv->leds[reg]; 201*1ab4531aSJean-Jacques Hiblot 202*1ab4531aSJean-Jacques Hiblot led->active = true; 203*1ab4531aSJean-Jacques Hiblot led->ldev.name = 204e370d010SAndrew Lunn of_get_property(child, "label", NULL) ? : child->name; 205*1ab4531aSJean-Jacques Hiblot led->ldev.default_trigger = 206e370d010SAndrew Lunn of_get_property(child, "linux,default-trigger", NULL); 207*1ab4531aSJean-Jacques Hiblot 208*1ab4531aSJean-Jacques Hiblot led->priv = priv; 209*1ab4531aSJean-Jacques Hiblot led->led_no = reg; 210*1ab4531aSJean-Jacques Hiblot led->ldev.brightness_set_blocking = tlc591xx_brightness_set; 211*1ab4531aSJean-Jacques Hiblot led->ldev.max_brightness = LED_FULL; 212*1ab4531aSJean-Jacques Hiblot err = devm_led_classdev_register(dev, &led->ldev); 213*1ab4531aSJean-Jacques Hiblot if (err < 0) { 214*1ab4531aSJean-Jacques Hiblot dev_err(dev, "couldn't register LED %s\n", 215*1ab4531aSJean-Jacques Hiblot led->ldev.name); 216*1ab4531aSJean-Jacques Hiblot return err; 217e370d010SAndrew Lunn } 218e370d010SAndrew Lunn } 219e370d010SAndrew Lunn return 0; 220e370d010SAndrew Lunn } 221e370d010SAndrew Lunn 222e370d010SAndrew Lunn static const struct i2c_device_id tlc591xx_id[] = { 223e370d010SAndrew Lunn { "tlc59116" }, 224e370d010SAndrew Lunn { "tlc59108" }, 225e370d010SAndrew Lunn {}, 226e370d010SAndrew Lunn }; 227e370d010SAndrew Lunn MODULE_DEVICE_TABLE(i2c, tlc591xx_id); 228e370d010SAndrew Lunn 229e370d010SAndrew Lunn static struct i2c_driver tlc591xx_driver = { 230e370d010SAndrew Lunn .driver = { 231e370d010SAndrew Lunn .name = "tlc591xx", 232e370d010SAndrew Lunn .of_match_table = of_match_ptr(of_tlc591xx_leds_match), 233e370d010SAndrew Lunn }, 234e370d010SAndrew Lunn .probe = tlc591xx_probe, 235e370d010SAndrew Lunn .id_table = tlc591xx_id, 236e370d010SAndrew Lunn }; 237e370d010SAndrew Lunn 238e370d010SAndrew Lunn module_i2c_driver(tlc591xx_driver); 239e370d010SAndrew Lunn 240e370d010SAndrew Lunn MODULE_AUTHOR("Andrew Lunn <andrew@lunn.ch>"); 241e370d010SAndrew Lunn MODULE_LICENSE("GPL"); 242e370d010SAndrew Lunn MODULE_DESCRIPTION("TLC591XX LED driver"); 243