// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (C) Rockchip Electronics Co.Ltd
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* Author:
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* Guochun Huang <hero.huang@rock-chips.com>
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*/
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#include <asm/unaligned.h>
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#include <drm/drm_bridge.h>
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#include <drm/drm_atomic_state_helper.h>
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#include <drm/drm_mipi_dsi.h>
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#include <drm/drm_modeset_helper_vtables.h>
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#include <drm/drm_of.h>
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#include <drm/drm_print.h>
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#include <drm/drm_probe_helper.h>
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#include <drm/drm_panel.h>
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#include <linux/kernel.h>
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#include <linux/delay.h>
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#include <linux/clk.h>
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#include <linux/gpio/consumer.h>
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#include <linux/regulator/consumer.h>
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#include <linux/i2c.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/of_gpio.h>
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#include <linux/regmap.h>
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struct serdes_init_seq {
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struct reg_sequence *reg_sequence;
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unsigned int reg_seq_cnt;
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};
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struct bu18rl82 {
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struct drm_bridge base;
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struct drm_panel *panel;
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struct device *dev;
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struct regmap *regmap;
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struct serdes_init_seq *serdes_init_seq;
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};
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static const struct regmap_config bu18rl82_regmap_config = {
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.name = "bu18rl82",
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.reg_bits = 16,
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.val_bits = 8,
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.max_register = 0x0700,
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};
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static struct bu18rl82 *bridge_to_bu18rl82(struct drm_bridge *bridge)
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{
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return container_of(bridge, struct bu18rl82, base);
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}
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static int bu18rl82_parse_init_seq(struct device *dev, const u16 *data,
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int length, struct serdes_init_seq *seq)
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{
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struct reg_sequence *reg_sequence;
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u16 *buf, *d;
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unsigned int i, cnt;
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if (!seq)
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return -EINVAL;
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buf = devm_kmemdup(dev, data, length, GFP_KERNEL);
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if (!buf)
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return -ENOMEM;
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d = buf;
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cnt = length / 4;
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seq->reg_seq_cnt = cnt;
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seq->reg_sequence = devm_kcalloc(dev, cnt, sizeof(struct reg_sequence), GFP_KERNEL);
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if (!seq->reg_sequence)
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return -ENOMEM;
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for (i = 0; i < cnt; i++) {
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reg_sequence = &seq->reg_sequence[i];
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reg_sequence->reg = get_unaligned_be16(&d[0]);
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reg_sequence->def = get_unaligned_be16(&d[1]);
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d += 2;
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}
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return 0;
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}
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static int bu18rl82_get_init_seq(struct bu18rl82 *bu18rl82)
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{
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struct device *dev = bu18rl82->dev;
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struct device_node *np = dev->of_node;
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const void *data;
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int len, err;
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data = of_get_property(np, "serdes-init-sequence", &len);
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if (!data) {
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dev_err(dev, "failed to get serdes-init-sequence\n");
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return -EINVAL;
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}
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bu18rl82->serdes_init_seq = devm_kzalloc(dev, sizeof(*bu18rl82->serdes_init_seq),
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GFP_KERNEL);
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if (!bu18rl82->serdes_init_seq)
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return -ENOMEM;
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err = bu18rl82_parse_init_seq(dev, data, len, bu18rl82->serdes_init_seq);
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if (err) {
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dev_err(dev, "failed to parse serdes-init-sequence\n");
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return err;
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}
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return 0;
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}
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static int bu18rl82_bridge_get_modes(struct drm_bridge *bridge,
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struct drm_connector *connector)
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{
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struct bu18rl82 *bu18rl82 = bridge_to_bu18rl82(bridge);
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return drm_panel_get_modes(bu18rl82->panel, connector);
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}
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static int bu18rl82_bridge_attach(struct drm_bridge *bridge,
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enum drm_bridge_attach_flags flags)
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{
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struct bu18rl82 *bu18rl82 = bridge_to_bu18rl82(bridge);
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int ret;
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ret = drm_of_find_panel_or_bridge(bu18rl82->dev->of_node, 1, -1,
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&bu18rl82->panel, NULL);
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if (ret)
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return ret;
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return 0;
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}
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static void bu18rl82_bridge_enable(struct drm_bridge *bridge)
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{
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struct bu18rl82 *bu18rl82 = bridge_to_bu18rl82(bridge);
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struct serdes_init_seq *init_seq = bu18rl82->serdes_init_seq;
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int count = init_seq->reg_seq_cnt;
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regmap_multi_reg_write(bu18rl82->regmap, init_seq->reg_sequence, count);
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drm_panel_enable(bu18rl82->panel);
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}
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static void bu18rl82_bridge_disable(struct drm_bridge *bridge)
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{
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struct bu18rl82 *bu18rl82 = bridge_to_bu18rl82(bridge);
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drm_panel_disable(bu18rl82->panel);
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regmap_write(bu18rl82->regmap, 0x91, 0x00);
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}
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static void bu18rl82_bridge_pre_enable(struct drm_bridge *bridge)
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{
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struct bu18rl82 *bu18rl82 = bridge_to_bu18rl82(bridge);
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drm_panel_prepare(bu18rl82->panel);
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}
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static void bu18rl82_bridge_post_disable(struct drm_bridge *bridge)
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{
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struct bu18rl82 *bu18rl82 = bridge_to_bu18rl82(bridge);
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drm_panel_unprepare(bu18rl82->panel);
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}
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static const struct drm_bridge_funcs bu18rl82_bridge_funcs = {
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.attach = bu18rl82_bridge_attach,
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.enable = bu18rl82_bridge_enable,
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.disable = bu18rl82_bridge_disable,
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.pre_enable = bu18rl82_bridge_pre_enable,
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.post_disable = bu18rl82_bridge_post_disable,
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.get_modes = bu18rl82_bridge_get_modes,
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};
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static int bu18rl82_i2c_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 *dev = &client->dev;
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struct bu18rl82 *bu18rl82;
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int ret;
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bu18rl82 = devm_kzalloc(dev, sizeof(*bu18rl82), GFP_KERNEL);
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if (!bu18rl82)
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return -ENOMEM;
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bu18rl82->dev = dev;
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i2c_set_clientdata(client, bu18rl82);
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bu18rl82->regmap = devm_regmap_init_i2c(client, &bu18rl82_regmap_config);
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if (IS_ERR(bu18rl82->regmap))
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return dev_err_probe(dev, PTR_ERR(bu18rl82->regmap),
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"failed to initialize regmap\n");
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ret = bu18rl82_get_init_seq(bu18rl82);
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if (ret)
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return ret;
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bu18rl82->base.funcs = &bu18rl82_bridge_funcs;
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bu18rl82->base.of_node = dev->of_node;
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bu18rl82->base.ops = DRM_BRIDGE_OP_MODES;
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drm_bridge_add(&bu18rl82->base);
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return 0;
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}
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static int bu18rl82_i2c_remove(struct i2c_client *client)
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{
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struct bu18rl82 *bu18rl82 = i2c_get_clientdata(client);
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drm_bridge_remove(&bu18rl82->base);
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return 0;
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}
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static const struct i2c_device_id bu18rl82_i2c_table[] = {
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{ "bu18rl82", 0 },
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{}
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};
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MODULE_DEVICE_TABLE(i2c, bu18rl82_i2c_table);
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static const struct of_device_id bu18rl82_of_match[] = {
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{ .compatible = "rohm,bu18rl82" },
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{}
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};
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MODULE_DEVICE_TABLE(of, bu18rl82_of_match);
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static struct i2c_driver bu18rl82_i2c_driver = {
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.driver = {
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.name = "bu18rl82",
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.of_match_table = bu18rl82_of_match,
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},
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.probe = bu18rl82_i2c_probe,
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.remove = bu18rl82_i2c_remove,
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.id_table = bu18rl82_i2c_table,
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};
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module_i2c_driver(bu18rl82_i2c_driver);
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MODULE_AUTHOR("Guochun Huang <hero.huang@rock-chips.com>");
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MODULE_DESCRIPTION("Rohm BU18RL82 Clockless Link-BD Deserializer with LVDS Interface");
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MODULE_LICENSE("GPL");
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