1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright 2014 Belkin Inc. 4 * Copyright 2015 Andrew Lunn <andrew@lunn.ch> 5 */ 6 7 #include <linux/i2c.h> 8 #include <linux/leds.h> 9 #include <linux/module.h> 10 #include <linux/of.h> 11 #include <linux/regmap.h> 12 #include <linux/slab.h> 13 14 #define TLC591XX_MAX_LEDS 16 15 #define TLC591XX_MAX_BRIGHTNESS 256 16 17 #define TLC591XX_REG_MODE1 0x00 18 #define MODE1_RESPON_ADDR_MASK 0xF0 19 #define MODE1_NORMAL_MODE (0 << 4) 20 #define MODE1_SPEED_MODE (1 << 4) 21 22 #define TLC591XX_REG_MODE2 0x01 23 #define MODE2_DIM (0 << 5) 24 #define MODE2_BLINK (1 << 5) 25 #define MODE2_OCH_STOP (0 << 3) 26 #define MODE2_OCH_ACK (1 << 3) 27 28 #define TLC591XX_REG_PWM(x) (0x02 + (x)) 29 30 #define TLC591XX_REG_GRPPWM 0x12 31 #define TLC591XX_REG_GRPFREQ 0x13 32 33 /* LED Driver Output State, determine the source that drives LED outputs */ 34 #define LEDOUT_OFF 0x0 /* Output LOW */ 35 #define LEDOUT_ON 0x1 /* Output HI-Z */ 36 #define LEDOUT_DIM 0x2 /* Dimming */ 37 #define LEDOUT_BLINK 0x3 /* Blinking */ 38 #define LEDOUT_MASK 0x3 39 40 #define ldev_to_led(c) container_of(c, struct tlc591xx_led, ldev) 41 42 struct tlc591xx_led { 43 bool active; 44 unsigned int led_no; 45 struct led_classdev ldev; 46 struct tlc591xx_priv *priv; 47 }; 48 49 struct tlc591xx_priv { 50 struct tlc591xx_led leds[TLC591XX_MAX_LEDS]; 51 struct regmap *regmap; 52 unsigned int reg_ledout_offset; 53 }; 54 55 struct tlc591xx { 56 unsigned int max_leds; 57 unsigned int reg_ledout_offset; 58 }; 59 60 static const struct tlc591xx tlc59116 = { 61 .max_leds = 16, 62 .reg_ledout_offset = 0x14, 63 }; 64 65 static const struct tlc591xx tlc59108 = { 66 .max_leds = 8, 67 .reg_ledout_offset = 0x0c, 68 }; 69 70 static int 71 tlc591xx_set_mode(struct regmap *regmap, u8 mode) 72 { 73 int err; 74 u8 val; 75 76 err = regmap_write(regmap, TLC591XX_REG_MODE1, MODE1_NORMAL_MODE); 77 if (err) 78 return err; 79 80 val = MODE2_OCH_STOP | mode; 81 82 return regmap_write(regmap, TLC591XX_REG_MODE2, val); 83 } 84 85 static int 86 tlc591xx_set_ledout(struct tlc591xx_priv *priv, struct tlc591xx_led *led, 87 u8 val) 88 { 89 unsigned int i = (led->led_no % 4) * 2; 90 unsigned int mask = LEDOUT_MASK << i; 91 unsigned int addr = priv->reg_ledout_offset + (led->led_no >> 2); 92 93 val = val << i; 94 95 return regmap_update_bits(priv->regmap, addr, mask, val); 96 } 97 98 static int 99 tlc591xx_set_pwm(struct tlc591xx_priv *priv, struct tlc591xx_led *led, 100 u8 brightness) 101 { 102 u8 pwm = TLC591XX_REG_PWM(led->led_no); 103 104 return regmap_write(priv->regmap, pwm, brightness); 105 } 106 107 static int 108 tlc591xx_brightness_set(struct led_classdev *led_cdev, 109 enum led_brightness brightness) 110 { 111 struct tlc591xx_led *led = ldev_to_led(led_cdev); 112 struct tlc591xx_priv *priv = led->priv; 113 int err; 114 115 switch ((int)brightness) { 116 case 0: 117 err = tlc591xx_set_ledout(priv, led, LEDOUT_OFF); 118 break; 119 case TLC591XX_MAX_BRIGHTNESS: 120 err = tlc591xx_set_ledout(priv, led, LEDOUT_ON); 121 break; 122 default: 123 err = tlc591xx_set_ledout(priv, led, LEDOUT_DIM); 124 if (!err) 125 err = tlc591xx_set_pwm(priv, led, brightness); 126 } 127 128 return err; 129 } 130 131 static const struct regmap_config tlc591xx_regmap = { 132 .reg_bits = 8, 133 .val_bits = 8, 134 .max_register = 0x1e, 135 }; 136 137 static const struct of_device_id of_tlc591xx_leds_match[] __maybe_unused = { 138 { .compatible = "ti,tlc59116", 139 .data = &tlc59116 }, 140 { .compatible = "ti,tlc59108", 141 .data = &tlc59108 }, 142 {}, 143 }; 144 MODULE_DEVICE_TABLE(of, of_tlc591xx_leds_match); 145 146 static int 147 tlc591xx_probe(struct i2c_client *client) 148 { 149 struct device_node *np, *child; 150 struct device *dev = &client->dev; 151 const struct tlc591xx *tlc591xx; 152 struct tlc591xx_priv *priv; 153 int err, count, reg; 154 155 np = dev_of_node(dev); 156 if (!np) 157 return -ENODEV; 158 159 tlc591xx = device_get_match_data(dev); 160 if (!tlc591xx) 161 return -ENODEV; 162 163 count = of_get_available_child_count(np); 164 if (!count || count > tlc591xx->max_leds) 165 return -EINVAL; 166 167 priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); 168 if (!priv) 169 return -ENOMEM; 170 171 priv->regmap = devm_regmap_init_i2c(client, &tlc591xx_regmap); 172 if (IS_ERR(priv->regmap)) { 173 err = PTR_ERR(priv->regmap); 174 dev_err(dev, "Failed to allocate register map: %d\n", err); 175 return err; 176 } 177 priv->reg_ledout_offset = tlc591xx->reg_ledout_offset; 178 179 i2c_set_clientdata(client, priv); 180 181 err = tlc591xx_set_mode(priv->regmap, MODE2_DIM); 182 if (err < 0) 183 return err; 184 185 for_each_available_child_of_node(np, child) { 186 struct tlc591xx_led *led; 187 struct led_init_data init_data = {}; 188 189 init_data.fwnode = of_fwnode_handle(child); 190 191 err = of_property_read_u32(child, "reg", ®); 192 if (err) { 193 of_node_put(child); 194 return err; 195 } 196 if (reg < 0 || reg >= tlc591xx->max_leds || 197 priv->leds[reg].active) { 198 of_node_put(child); 199 return -EINVAL; 200 } 201 led = &priv->leds[reg]; 202 203 led->active = true; 204 led->priv = priv; 205 led->led_no = reg; 206 led->ldev.brightness_set_blocking = tlc591xx_brightness_set; 207 led->ldev.max_brightness = TLC591XX_MAX_BRIGHTNESS; 208 err = devm_led_classdev_register_ext(dev, &led->ldev, 209 &init_data); 210 if (err < 0) { 211 of_node_put(child); 212 return dev_err_probe(dev, err, 213 "couldn't register LED %s\n", 214 led->ldev.name); 215 } 216 } 217 return 0; 218 } 219 220 static const struct i2c_device_id tlc591xx_id[] = { 221 { "tlc59116" }, 222 { "tlc59108" }, 223 {}, 224 }; 225 MODULE_DEVICE_TABLE(i2c, tlc591xx_id); 226 227 static struct i2c_driver tlc591xx_driver = { 228 .driver = { 229 .name = "tlc591xx", 230 .of_match_table = of_match_ptr(of_tlc591xx_leds_match), 231 }, 232 .probe = tlc591xx_probe, 233 .id_table = tlc591xx_id, 234 }; 235 236 module_i2c_driver(tlc591xx_driver); 237 238 MODULE_AUTHOR("Andrew Lunn <andrew@lunn.ch>"); 239 MODULE_LICENSE("GPL"); 240 MODULE_DESCRIPTION("TLC591XX LED driver"); 241