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/of_device.h> 12 #include <linux/regmap.h> 13 #include <linux/slab.h> 14 15 #define TLC591XX_MAX_LEDS 16 16 #define TLC591XX_MAX_BRIGHTNESS 256 17 18 #define TLC591XX_REG_MODE1 0x00 19 #define MODE1_RESPON_ADDR_MASK 0xF0 20 #define MODE1_NORMAL_MODE (0 << 4) 21 #define MODE1_SPEED_MODE (1 << 4) 22 23 #define TLC591XX_REG_MODE2 0x01 24 #define MODE2_DIM (0 << 5) 25 #define MODE2_BLINK (1 << 5) 26 #define MODE2_OCH_STOP (0 << 3) 27 #define MODE2_OCH_ACK (1 << 3) 28 29 #define TLC591XX_REG_PWM(x) (0x02 + (x)) 30 31 #define TLC591XX_REG_GRPPWM 0x12 32 #define TLC591XX_REG_GRPFREQ 0x13 33 34 /* LED Driver Output State, determine the source that drives LED outputs */ 35 #define LEDOUT_OFF 0x0 /* Output LOW */ 36 #define LEDOUT_ON 0x1 /* Output HI-Z */ 37 #define LEDOUT_DIM 0x2 /* Dimming */ 38 #define LEDOUT_BLINK 0x3 /* Blinking */ 39 #define LEDOUT_MASK 0x3 40 41 #define ldev_to_led(c) container_of(c, struct tlc591xx_led, ldev) 42 43 struct tlc591xx_led { 44 bool active; 45 unsigned int led_no; 46 struct led_classdev ldev; 47 struct tlc591xx_priv *priv; 48 }; 49 50 struct tlc591xx_priv { 51 struct tlc591xx_led leds[TLC591XX_MAX_LEDS]; 52 struct regmap *regmap; 53 unsigned int reg_ledout_offset; 54 }; 55 56 struct tlc591xx { 57 unsigned int max_leds; 58 unsigned int reg_ledout_offset; 59 }; 60 61 static const struct tlc591xx tlc59116 = { 62 .max_leds = 16, 63 .reg_ledout_offset = 0x14, 64 }; 65 66 static const struct tlc591xx tlc59108 = { 67 .max_leds = 8, 68 .reg_ledout_offset = 0x0c, 69 }; 70 71 static int 72 tlc591xx_set_mode(struct regmap *regmap, u8 mode) 73 { 74 int err; 75 u8 val; 76 77 err = regmap_write(regmap, TLC591XX_REG_MODE1, MODE1_NORMAL_MODE); 78 if (err) 79 return err; 80 81 val = MODE2_OCH_STOP | mode; 82 83 return regmap_write(regmap, TLC591XX_REG_MODE2, val); 84 } 85 86 static int 87 tlc591xx_set_ledout(struct tlc591xx_priv *priv, struct tlc591xx_led *led, 88 u8 val) 89 { 90 unsigned int i = (led->led_no % 4) * 2; 91 unsigned int mask = LEDOUT_MASK << i; 92 unsigned int addr = priv->reg_ledout_offset + (led->led_no >> 2); 93 94 val = val << i; 95 96 return regmap_update_bits(priv->regmap, addr, mask, val); 97 } 98 99 static int 100 tlc591xx_set_pwm(struct tlc591xx_priv *priv, struct tlc591xx_led *led, 101 u8 brightness) 102 { 103 u8 pwm = TLC591XX_REG_PWM(led->led_no); 104 105 return regmap_write(priv->regmap, pwm, brightness); 106 } 107 108 static int 109 tlc591xx_brightness_set(struct led_classdev *led_cdev, 110 enum led_brightness brightness) 111 { 112 struct tlc591xx_led *led = ldev_to_led(led_cdev); 113 struct tlc591xx_priv *priv = led->priv; 114 int err; 115 116 switch ((int)brightness) { 117 case 0: 118 err = tlc591xx_set_ledout(priv, led, LEDOUT_OFF); 119 break; 120 case TLC591XX_MAX_BRIGHTNESS: 121 err = tlc591xx_set_ledout(priv, led, LEDOUT_ON); 122 break; 123 default: 124 err = tlc591xx_set_ledout(priv, led, LEDOUT_DIM); 125 if (!err) 126 err = tlc591xx_set_pwm(priv, led, brightness); 127 } 128 129 return err; 130 } 131 132 static const struct regmap_config tlc591xx_regmap = { 133 .reg_bits = 8, 134 .val_bits = 8, 135 .max_register = 0x1e, 136 }; 137 138 static const struct of_device_id of_tlc591xx_leds_match[] = { 139 { .compatible = "ti,tlc59116", 140 .data = &tlc59116 }, 141 { .compatible = "ti,tlc59108", 142 .data = &tlc59108 }, 143 {}, 144 }; 145 MODULE_DEVICE_TABLE(of, of_tlc591xx_leds_match); 146 147 static int 148 tlc591xx_probe(struct i2c_client *client, 149 const struct i2c_device_id *id) 150 { 151 struct device_node *np, *child; 152 struct device *dev = &client->dev; 153 const struct tlc591xx *tlc591xx; 154 struct tlc591xx_priv *priv; 155 int err, count, reg; 156 157 np = dev_of_node(dev); 158 if (!np) 159 return -ENODEV; 160 161 tlc591xx = device_get_match_data(dev); 162 if (!tlc591xx) 163 return -ENODEV; 164 165 count = of_get_available_child_count(np); 166 if (!count || count > tlc591xx->max_leds) 167 return -EINVAL; 168 169 priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); 170 if (!priv) 171 return -ENOMEM; 172 173 priv->regmap = devm_regmap_init_i2c(client, &tlc591xx_regmap); 174 if (IS_ERR(priv->regmap)) { 175 err = PTR_ERR(priv->regmap); 176 dev_err(dev, "Failed to allocate register map: %d\n", err); 177 return err; 178 } 179 priv->reg_ledout_offset = tlc591xx->reg_ledout_offset; 180 181 i2c_set_clientdata(client, priv); 182 183 err = tlc591xx_set_mode(priv->regmap, MODE2_DIM); 184 if (err < 0) 185 return err; 186 187 for_each_available_child_of_node(np, child) { 188 struct tlc591xx_led *led; 189 struct led_init_data init_data = {}; 190 191 init_data.fwnode = of_fwnode_handle(child); 192 193 err = of_property_read_u32(child, "reg", ®); 194 if (err) { 195 of_node_put(child); 196 return err; 197 } 198 if (reg < 0 || reg >= tlc591xx->max_leds || 199 priv->leds[reg].active) { 200 of_node_put(child); 201 return -EINVAL; 202 } 203 led = &priv->leds[reg]; 204 205 led->active = true; 206 led->priv = priv; 207 led->led_no = reg; 208 led->ldev.brightness_set_blocking = tlc591xx_brightness_set; 209 led->ldev.max_brightness = TLC591XX_MAX_BRIGHTNESS; 210 err = devm_led_classdev_register_ext(dev, &led->ldev, 211 &init_data); 212 if (err < 0) { 213 of_node_put(child); 214 return dev_err_probe(dev, err, 215 "couldn't register LED %s\n", 216 led->ldev.name); 217 } 218 } 219 return 0; 220 } 221 222 static const struct i2c_device_id tlc591xx_id[] = { 223 { "tlc59116" }, 224 { "tlc59108" }, 225 {}, 226 }; 227 MODULE_DEVICE_TABLE(i2c, tlc591xx_id); 228 229 static struct i2c_driver tlc591xx_driver = { 230 .driver = { 231 .name = "tlc591xx", 232 .of_match_table = of_match_ptr(of_tlc591xx_leds_match), 233 }, 234 .probe = tlc591xx_probe, 235 .id_table = tlc591xx_id, 236 }; 237 238 module_i2c_driver(tlc591xx_driver); 239 240 MODULE_AUTHOR("Andrew Lunn <andrew@lunn.ch>"); 241 MODULE_LICENSE("GPL"); 242 MODULE_DESCRIPTION("TLC591XX LED driver"); 243