283 lines
6.3 KiB
C
283 lines
6.3 KiB
C
/*
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* Copyright 2014 Belkin Inc.
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* Copyright 2015 Andrew Lunn <andrew@lunn.ch>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; version 2 of the License.
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*/
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#include <linux/i2c.h>
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#include <linux/leds.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/of_device.h>
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#include <linux/regmap.h>
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#include <linux/slab.h>
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#define TLC591XX_MAX_LEDS 16
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#define TLC591XX_REG_MODE1 0x00
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#define MODE1_RESPON_ADDR_MASK 0xF0
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#define MODE1_NORMAL_MODE (0 << 4)
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#define MODE1_SPEED_MODE (1 << 4)
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#define TLC591XX_REG_MODE2 0x01
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#define MODE2_DIM (0 << 5)
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#define MODE2_BLINK (1 << 5)
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#define MODE2_OCH_STOP (0 << 3)
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#define MODE2_OCH_ACK (1 << 3)
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#define TLC591XX_REG_PWM(x) (0x02 + (x))
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#define TLC591XX_REG_GRPPWM 0x12
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#define TLC591XX_REG_GRPFREQ 0x13
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/* LED Driver Output State, determine the source that drives LED outputs */
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#define LEDOUT_OFF 0x0 /* Output LOW */
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#define LEDOUT_ON 0x1 /* Output HI-Z */
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#define LEDOUT_DIM 0x2 /* Dimming */
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#define LEDOUT_BLINK 0x3 /* Blinking */
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#define LEDOUT_MASK 0x3
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#define ldev_to_led(c) container_of(c, struct tlc591xx_led, ldev)
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struct tlc591xx_led {
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bool active;
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unsigned int led_no;
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struct led_classdev ldev;
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struct tlc591xx_priv *priv;
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};
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struct tlc591xx_priv {
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struct tlc591xx_led leds[TLC591XX_MAX_LEDS];
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struct regmap *regmap;
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unsigned int reg_ledout_offset;
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};
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struct tlc591xx {
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unsigned int max_leds;
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unsigned int reg_ledout_offset;
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};
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static const struct tlc591xx tlc59116 = {
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.max_leds = 16,
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.reg_ledout_offset = 0x14,
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};
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static const struct tlc591xx tlc59108 = {
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.max_leds = 8,
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.reg_ledout_offset = 0x0c,
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};
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static int
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tlc591xx_set_mode(struct regmap *regmap, u8 mode)
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{
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int err;
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u8 val;
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err = regmap_write(regmap, TLC591XX_REG_MODE1, MODE1_NORMAL_MODE);
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if (err)
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return err;
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val = MODE2_OCH_STOP | mode;
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return regmap_write(regmap, TLC591XX_REG_MODE2, val);
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}
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static int
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tlc591xx_set_ledout(struct tlc591xx_priv *priv, struct tlc591xx_led *led,
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u8 val)
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{
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unsigned int i = (led->led_no % 4) * 2;
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unsigned int mask = LEDOUT_MASK << i;
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unsigned int addr = priv->reg_ledout_offset + (led->led_no >> 2);
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val = val << i;
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return regmap_update_bits(priv->regmap, addr, mask, val);
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}
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static int
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tlc591xx_set_pwm(struct tlc591xx_priv *priv, struct tlc591xx_led *led,
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u8 brightness)
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{
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u8 pwm = TLC591XX_REG_PWM(led->led_no);
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return regmap_write(priv->regmap, pwm, brightness);
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}
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static int
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tlc591xx_brightness_set(struct led_classdev *led_cdev,
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enum led_brightness brightness)
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{
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struct tlc591xx_led *led = ldev_to_led(led_cdev);
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struct tlc591xx_priv *priv = led->priv;
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int err;
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switch (brightness) {
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case 0:
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err = tlc591xx_set_ledout(priv, led, LEDOUT_OFF);
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break;
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case LED_FULL:
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err = tlc591xx_set_ledout(priv, led, LEDOUT_ON);
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break;
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default:
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err = tlc591xx_set_ledout(priv, led, LEDOUT_DIM);
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if (!err)
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err = tlc591xx_set_pwm(priv, led, brightness);
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}
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return err;
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}
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static void
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tlc591xx_destroy_devices(struct tlc591xx_priv *priv, unsigned int j)
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{
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int i = j;
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while (--i >= 0) {
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if (priv->leds[i].active)
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led_classdev_unregister(&priv->leds[i].ldev);
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}
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}
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static int
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tlc591xx_configure(struct device *dev,
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struct tlc591xx_priv *priv,
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const struct tlc591xx *tlc591xx)
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{
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unsigned int i;
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int err = 0;
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tlc591xx_set_mode(priv->regmap, MODE2_DIM);
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for (i = 0; i < TLC591XX_MAX_LEDS; i++) {
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struct tlc591xx_led *led = &priv->leds[i];
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if (!led->active)
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continue;
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led->priv = priv;
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led->led_no = i;
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led->ldev.brightness_set_blocking = tlc591xx_brightness_set;
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led->ldev.max_brightness = LED_FULL;
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err = led_classdev_register(dev, &led->ldev);
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if (err < 0) {
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dev_err(dev, "couldn't register LED %s\n",
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led->ldev.name);
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goto exit;
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}
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}
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return 0;
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exit:
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tlc591xx_destroy_devices(priv, i);
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return err;
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}
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static const struct regmap_config tlc591xx_regmap = {
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.reg_bits = 8,
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.val_bits = 8,
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.max_register = 0x1e,
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};
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static const struct of_device_id of_tlc591xx_leds_match[] = {
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{ .compatible = "ti,tlc59116",
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.data = &tlc59116 },
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{ .compatible = "ti,tlc59108",
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.data = &tlc59108 },
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{},
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};
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MODULE_DEVICE_TABLE(of, of_tlc591xx_leds_match);
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static int
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tlc591xx_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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struct device_node *np = client->dev.of_node, *child;
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struct device *dev = &client->dev;
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const struct of_device_id *match;
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const struct tlc591xx *tlc591xx;
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struct tlc591xx_priv *priv;
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int err, count, reg;
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match = of_match_device(of_tlc591xx_leds_match, dev);
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if (!match)
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return -ENODEV;
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tlc591xx = match->data;
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if (!np)
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return -ENODEV;
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count = of_get_child_count(np);
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if (!count || count > tlc591xx->max_leds)
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return -EINVAL;
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priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
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if (!priv)
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return -ENOMEM;
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priv->regmap = devm_regmap_init_i2c(client, &tlc591xx_regmap);
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if (IS_ERR(priv->regmap)) {
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err = PTR_ERR(priv->regmap);
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dev_err(dev, "Failed to allocate register map: %d\n", err);
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return err;
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}
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priv->reg_ledout_offset = tlc591xx->reg_ledout_offset;
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i2c_set_clientdata(client, priv);
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for_each_child_of_node(np, child) {
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err = of_property_read_u32(child, "reg", ®);
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if (err) {
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of_node_put(child);
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return err;
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}
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if (reg < 0 || reg >= tlc591xx->max_leds ||
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priv->leds[reg].active) {
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of_node_put(child);
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return -EINVAL;
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}
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priv->leds[reg].active = true;
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priv->leds[reg].ldev.name =
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of_get_property(child, "label", NULL) ? : child->name;
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priv->leds[reg].ldev.default_trigger =
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of_get_property(child, "linux,default-trigger", NULL);
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}
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return tlc591xx_configure(dev, priv, tlc591xx);
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}
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static int
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tlc591xx_remove(struct i2c_client *client)
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{
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struct tlc591xx_priv *priv = i2c_get_clientdata(client);
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tlc591xx_destroy_devices(priv, TLC591XX_MAX_LEDS);
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return 0;
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}
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static const struct i2c_device_id tlc591xx_id[] = {
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{ "tlc59116" },
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{ "tlc59108" },
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{},
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};
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MODULE_DEVICE_TABLE(i2c, tlc591xx_id);
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static struct i2c_driver tlc591xx_driver = {
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.driver = {
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.name = "tlc591xx",
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.of_match_table = of_match_ptr(of_tlc591xx_leds_match),
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},
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.probe = tlc591xx_probe,
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.remove = tlc591xx_remove,
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.id_table = tlc591xx_id,
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};
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module_i2c_driver(tlc591xx_driver);
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MODULE_AUTHOR("Andrew Lunn <andrew@lunn.ch>");
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MODULE_LICENSE("GPL");
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MODULE_DESCRIPTION("TLC591XX LED driver");
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