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450 lines
12 KiB
450 lines
12 KiB
/*
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* Copyright 2015-16 Golden Delicious Computers
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*
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* Author: Nikolaus Schaller <hns@goldelico.com>
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*
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* This file is subject to the terms and conditions of version 2 of
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* the GNU General Public License. See the file COPYING in the main
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* directory of this archive for more details.
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*
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* LED driver for the IS31FL319{0,1,3,6,9} to drive 1, 3, 6 or 9 light
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* effect LEDs.
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*
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*/
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#include <linux/err.h>
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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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/* register numbers */
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#define IS31FL319X_SHUTDOWN 0x00
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#define IS31FL319X_CTRL1 0x01
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#define IS31FL319X_CTRL2 0x02
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#define IS31FL319X_CONFIG1 0x03
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#define IS31FL319X_CONFIG2 0x04
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#define IS31FL319X_RAMP_MODE 0x05
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#define IS31FL319X_BREATH_MASK 0x06
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#define IS31FL319X_PWM(channel) (0x07 + channel)
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#define IS31FL319X_DATA_UPDATE 0x10
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#define IS31FL319X_T0(channel) (0x11 + channel)
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#define IS31FL319X_T123_1 0x1a
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#define IS31FL319X_T123_2 0x1b
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#define IS31FL319X_T123_3 0x1c
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#define IS31FL319X_T4(channel) (0x1d + channel)
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#define IS31FL319X_TIME_UPDATE 0x26
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#define IS31FL319X_RESET 0xff
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#define IS31FL319X_REG_CNT (IS31FL319X_RESET + 1)
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#define IS31FL319X_MAX_LEDS 9
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/* CS (Current Setting) in CONFIG2 register */
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#define IS31FL319X_CONFIG2_CS_SHIFT 4
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#define IS31FL319X_CONFIG2_CS_MASK 0x7
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#define IS31FL319X_CONFIG2_CS_STEP_REF 12
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#define IS31FL319X_CURRENT_MIN ((u32)5000)
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#define IS31FL319X_CURRENT_MAX ((u32)40000)
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#define IS31FL319X_CURRENT_STEP ((u32)5000)
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#define IS31FL319X_CURRENT_DEFAULT ((u32)20000)
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/* Audio gain in CONFIG2 register */
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#define IS31FL319X_AUDIO_GAIN_DB_MAX ((u32)21)
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#define IS31FL319X_AUDIO_GAIN_DB_STEP ((u32)3)
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/*
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* regmap is used as a cache of chip's register space,
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* to avoid reading back brightness values from chip,
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* which is known to hang.
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*/
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struct is31fl319x_chip {
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const struct is31fl319x_chipdef *cdef;
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struct i2c_client *client;
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struct regmap *regmap;
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struct mutex lock;
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u32 audio_gain_db;
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struct is31fl319x_led {
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struct is31fl319x_chip *chip;
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struct led_classdev cdev;
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u32 max_microamp;
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bool configured;
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} leds[IS31FL319X_MAX_LEDS];
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};
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struct is31fl319x_chipdef {
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int num_leds;
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};
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static const struct is31fl319x_chipdef is31fl3190_cdef = {
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.num_leds = 1,
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};
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static const struct is31fl319x_chipdef is31fl3193_cdef = {
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.num_leds = 3,
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};
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static const struct is31fl319x_chipdef is31fl3196_cdef = {
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.num_leds = 6,
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};
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static const struct is31fl319x_chipdef is31fl3199_cdef = {
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.num_leds = 9,
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};
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static const struct of_device_id of_is31fl319x_match[] = {
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{ .compatible = "issi,is31fl3190", .data = &is31fl3190_cdef, },
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{ .compatible = "issi,is31fl3191", .data = &is31fl3190_cdef, },
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{ .compatible = "issi,is31fl3193", .data = &is31fl3193_cdef, },
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{ .compatible = "issi,is31fl3196", .data = &is31fl3196_cdef, },
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{ .compatible = "issi,is31fl3199", .data = &is31fl3199_cdef, },
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{ .compatible = "si-en,sn3199", .data = &is31fl3199_cdef, },
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{ }
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};
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MODULE_DEVICE_TABLE(of, of_is31fl319x_match);
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static int is31fl319x_brightness_set(struct led_classdev *cdev,
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enum led_brightness brightness)
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{
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struct is31fl319x_led *led = container_of(cdev, struct is31fl319x_led,
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cdev);
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struct is31fl319x_chip *is31 = led->chip;
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int chan = led - is31->leds;
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int ret;
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int i;
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u8 ctrl1 = 0, ctrl2 = 0;
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dev_dbg(&is31->client->dev, "%s %d: %d\n", __func__, chan, brightness);
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mutex_lock(&is31->lock);
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/* update PWM register */
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ret = regmap_write(is31->regmap, IS31FL319X_PWM(chan), brightness);
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if (ret < 0)
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goto out;
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/* read current brightness of all PWM channels */
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for (i = 0; i < is31->cdef->num_leds; i++) {
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unsigned int pwm_value;
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bool on;
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/*
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* since neither cdev nor the chip can provide
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* the current setting, we read from the regmap cache
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*/
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ret = regmap_read(is31->regmap, IS31FL319X_PWM(i), &pwm_value);
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dev_dbg(&is31->client->dev, "%s read %d: ret=%d: %d\n",
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__func__, i, ret, pwm_value);
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on = ret >= 0 && pwm_value > LED_OFF;
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if (i < 3)
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ctrl1 |= on << i; /* 0..2 => bit 0..2 */
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else if (i < 6)
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ctrl1 |= on << (i + 1); /* 3..5 => bit 4..6 */
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else
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ctrl2 |= on << (i - 6); /* 6..8 => bit 0..2 */
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}
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if (ctrl1 > 0 || ctrl2 > 0) {
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dev_dbg(&is31->client->dev, "power up %02x %02x\n",
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ctrl1, ctrl2);
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regmap_write(is31->regmap, IS31FL319X_CTRL1, ctrl1);
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regmap_write(is31->regmap, IS31FL319X_CTRL2, ctrl2);
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/* update PWMs */
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regmap_write(is31->regmap, IS31FL319X_DATA_UPDATE, 0x00);
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/* enable chip from shut down */
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ret = regmap_write(is31->regmap, IS31FL319X_SHUTDOWN, 0x01);
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} else {
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dev_dbg(&is31->client->dev, "power down\n");
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/* shut down (no need to clear CTRL1/2) */
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ret = regmap_write(is31->regmap, IS31FL319X_SHUTDOWN, 0x00);
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}
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out:
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mutex_unlock(&is31->lock);
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return ret;
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}
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static int is31fl319x_parse_child_dt(const struct device *dev,
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const struct device_node *child,
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struct is31fl319x_led *led)
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{
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struct led_classdev *cdev = &led->cdev;
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int ret;
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if (of_property_read_string(child, "label", &cdev->name))
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cdev->name = child->name;
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ret = of_property_read_string(child, "linux,default-trigger",
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&cdev->default_trigger);
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if (ret < 0 && ret != -EINVAL) /* is optional */
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return ret;
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led->max_microamp = IS31FL319X_CURRENT_DEFAULT;
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ret = of_property_read_u32(child, "led-max-microamp",
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&led->max_microamp);
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if (!ret) {
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if (led->max_microamp < IS31FL319X_CURRENT_MIN)
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return -EINVAL; /* not supported */
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led->max_microamp = min(led->max_microamp,
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IS31FL319X_CURRENT_MAX);
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}
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return 0;
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}
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static int is31fl319x_parse_dt(struct device *dev,
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struct is31fl319x_chip *is31)
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{
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struct device_node *np = dev->of_node, *child;
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const struct of_device_id *of_dev_id;
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int count;
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int ret;
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if (!np)
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return -ENODEV;
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of_dev_id = of_match_device(of_is31fl319x_match, dev);
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if (!of_dev_id) {
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dev_err(dev, "Failed to match device with supported chips\n");
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return -EINVAL;
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}
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is31->cdef = of_dev_id->data;
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count = of_get_child_count(np);
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dev_dbg(dev, "probe %s with %d leds defined in DT\n",
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of_dev_id->compatible, count);
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if (!count || count > is31->cdef->num_leds) {
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dev_err(dev, "Number of leds defined must be between 1 and %u\n",
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is31->cdef->num_leds);
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return -ENODEV;
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}
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for_each_child_of_node(np, child) {
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struct is31fl319x_led *led;
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u32 reg;
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ret = of_property_read_u32(child, "reg", ®);
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if (ret) {
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dev_err(dev, "Failed to read led 'reg' property\n");
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goto put_child_node;
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}
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if (reg < 1 || reg > is31->cdef->num_leds) {
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dev_err(dev, "invalid led reg %u\n", reg);
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ret = -EINVAL;
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goto put_child_node;
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}
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led = &is31->leds[reg - 1];
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if (led->configured) {
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dev_err(dev, "led %u is already configured\n", reg);
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ret = -EINVAL;
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goto put_child_node;
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}
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ret = is31fl319x_parse_child_dt(dev, child, led);
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if (ret) {
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dev_err(dev, "led %u DT parsing failed\n", reg);
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goto put_child_node;
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}
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led->configured = true;
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}
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is31->audio_gain_db = 0;
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ret = of_property_read_u32(np, "audio-gain-db", &is31->audio_gain_db);
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if (!ret)
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is31->audio_gain_db = min(is31->audio_gain_db,
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IS31FL319X_AUDIO_GAIN_DB_MAX);
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return 0;
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put_child_node:
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of_node_put(child);
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return ret;
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}
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static bool is31fl319x_readable_reg(struct device *dev, unsigned int reg)
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{ /* we have no readable registers */
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return false;
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}
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static bool is31fl319x_volatile_reg(struct device *dev, unsigned int reg)
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{ /* volatile registers are not cached */
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switch (reg) {
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case IS31FL319X_DATA_UPDATE:
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case IS31FL319X_TIME_UPDATE:
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case IS31FL319X_RESET:
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return true; /* always write-through */
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default:
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return false;
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}
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}
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static const struct reg_default is31fl319x_reg_defaults[] = {
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{ IS31FL319X_CONFIG1, 0x00},
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{ IS31FL319X_CONFIG2, 0x00},
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{ IS31FL319X_PWM(0), 0x00},
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{ IS31FL319X_PWM(1), 0x00},
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{ IS31FL319X_PWM(2), 0x00},
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{ IS31FL319X_PWM(3), 0x00},
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{ IS31FL319X_PWM(4), 0x00},
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{ IS31FL319X_PWM(5), 0x00},
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{ IS31FL319X_PWM(6), 0x00},
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{ IS31FL319X_PWM(7), 0x00},
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{ IS31FL319X_PWM(8), 0x00},
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};
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static struct regmap_config regmap_config = {
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.reg_bits = 8,
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.val_bits = 8,
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.max_register = IS31FL319X_REG_CNT,
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.cache_type = REGCACHE_FLAT,
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.readable_reg = is31fl319x_readable_reg,
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.volatile_reg = is31fl319x_volatile_reg,
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.reg_defaults = is31fl319x_reg_defaults,
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.num_reg_defaults = ARRAY_SIZE(is31fl319x_reg_defaults),
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};
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static inline int is31fl319x_microamp_to_cs(struct device *dev, u32 microamp)
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{ /* round down to nearest supported value (range check done by caller) */
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u32 step = microamp / IS31FL319X_CURRENT_STEP;
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return ((IS31FL319X_CONFIG2_CS_STEP_REF - step) &
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IS31FL319X_CONFIG2_CS_MASK) <<
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IS31FL319X_CONFIG2_CS_SHIFT; /* CS encoding */
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}
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static inline int is31fl319x_db_to_gain(u32 dezibel)
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{ /* round down to nearest supported value (range check done by caller) */
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return dezibel / IS31FL319X_AUDIO_GAIN_DB_STEP;
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}
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static int is31fl319x_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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struct is31fl319x_chip *is31;
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struct device *dev = &client->dev;
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struct i2c_adapter *adapter = to_i2c_adapter(dev->parent);
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int err;
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int i = 0;
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u32 aggregated_led_microamp = IS31FL319X_CURRENT_MAX;
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if (!i2c_check_functionality(adapter, I2C_FUNC_I2C))
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return -EIO;
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is31 = devm_kzalloc(&client->dev, sizeof(*is31), GFP_KERNEL);
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if (!is31)
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return -ENOMEM;
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mutex_init(&is31->lock);
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err = is31fl319x_parse_dt(&client->dev, is31);
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if (err)
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goto free_mutex;
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is31->client = client;
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is31->regmap = devm_regmap_init_i2c(client, ®map_config);
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if (IS_ERR(is31->regmap)) {
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dev_err(&client->dev, "failed to allocate register map\n");
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err = PTR_ERR(is31->regmap);
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goto free_mutex;
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}
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i2c_set_clientdata(client, is31);
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/* check for write-reply from chip (we can't read any registers) */
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err = regmap_write(is31->regmap, IS31FL319X_RESET, 0x00);
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if (err < 0) {
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dev_err(&client->dev, "no response from chip write: err = %d\n",
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err);
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err = -EIO; /* does not answer */
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goto free_mutex;
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}
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/*
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* Kernel conventions require per-LED led-max-microamp property.
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* But the chip does not allow to limit individual LEDs.
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* So we take minimum from all subnodes for safety of hardware.
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*/
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for (i = 0; i < is31->cdef->num_leds; i++)
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if (is31->leds[i].configured &&
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is31->leds[i].max_microamp < aggregated_led_microamp)
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aggregated_led_microamp = is31->leds[i].max_microamp;
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regmap_write(is31->regmap, IS31FL319X_CONFIG2,
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is31fl319x_microamp_to_cs(dev, aggregated_led_microamp) |
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is31fl319x_db_to_gain(is31->audio_gain_db));
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for (i = 0; i < is31->cdef->num_leds; i++) {
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struct is31fl319x_led *led = &is31->leds[i];
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if (!led->configured)
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continue;
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led->chip = is31;
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led->cdev.brightness_set_blocking = is31fl319x_brightness_set;
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err = devm_led_classdev_register(&client->dev, &led->cdev);
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if (err < 0)
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goto free_mutex;
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}
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return 0;
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free_mutex:
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mutex_destroy(&is31->lock);
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return err;
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}
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static int is31fl319x_remove(struct i2c_client *client)
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{
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struct is31fl319x_chip *is31 = i2c_get_clientdata(client);
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mutex_destroy(&is31->lock);
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return 0;
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}
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/*
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* i2c-core (and modalias) requires that id_table be properly filled,
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* even though it is not used for DeviceTree based instantiation.
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*/
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static const struct i2c_device_id is31fl319x_id[] = {
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{ "is31fl3190" },
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{ "is31fl3191" },
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{ "is31fl3193" },
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{ "is31fl3196" },
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{ "is31fl3199" },
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{ "sn3199" },
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{},
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};
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MODULE_DEVICE_TABLE(i2c, is31fl319x_id);
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static struct i2c_driver is31fl319x_driver = {
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.driver = {
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.name = "leds-is31fl319x",
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.of_match_table = of_match_ptr(of_is31fl319x_match),
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},
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.probe = is31fl319x_probe,
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.remove = is31fl319x_remove,
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.id_table = is31fl319x_id,
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};
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module_i2c_driver(is31fl319x_driver);
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MODULE_AUTHOR("H. Nikolaus Schaller <hns@goldelico.com>");
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MODULE_AUTHOR("Andrey Utkin <andrey_utkin@fastmail.com>");
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MODULE_DESCRIPTION("IS31FL319X LED driver");
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MODULE_LICENSE("GPL v2");
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