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3e1c01d06e
Add shutdown hook so that the panel gets powered off with the system. Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com> Signed-off-by: Marek Vasut <marek.vasut+renesas@mailbox.org> Link: https://patch.msgid.link/20250616154018.430004-1-marek.vasut+renesas@mailbox.org Signed-off-by: Mark Brown <broonie@kernel.org>
126 lines
3.1 KiB
C
126 lines
3.1 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (C) 2022 Raspberry Pi Ltd.
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* Copyright (C) 2025 Marek Vasut
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*/
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#include <linux/err.h>
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#include <linux/gpio/driver.h>
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#include <linux/gpio/regmap.h>
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#include <linux/i2c.h>
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#include <linux/module.h>
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#include <linux/pwm.h>
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#include <linux/regmap.h>
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/* I2C registers of the microcontroller. */
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#define REG_ID 0x01
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#define REG_POWERON 0x02
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#define REG_PWM 0x03
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/* Bits for poweron register */
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#define LCD_RESET_BIT BIT(0)
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#define CTP_RESET_BIT BIT(1)
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/* Bits for the PWM register */
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#define PWM_BL_ENABLE BIT(7)
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#define PWM_BL_MASK GENMASK(4, 0)
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/* Treat LCD_RESET and CTP_RESET as GPIOs */
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#define NUM_GPIO 2
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static const struct regmap_config rpi_panel_regmap_config = {
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.reg_bits = 8,
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.val_bits = 8,
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.max_register = REG_PWM,
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.can_sleep = true,
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};
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static int rpi_panel_v2_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm,
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const struct pwm_state *state)
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{
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struct regmap *regmap = pwmchip_get_drvdata(chip);
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unsigned int duty;
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if (state->polarity != PWM_POLARITY_NORMAL)
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return -EINVAL;
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if (!state->enabled)
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return regmap_write(regmap, REG_PWM, 0);
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duty = pwm_get_relative_duty_cycle(state, PWM_BL_MASK);
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return regmap_write(regmap, REG_PWM, duty | PWM_BL_ENABLE);
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}
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static const struct pwm_ops rpi_panel_v2_pwm_ops = {
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.apply = rpi_panel_v2_pwm_apply,
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};
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/*
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* I2C driver interface functions
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*/
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static int rpi_panel_v2_i2c_probe(struct i2c_client *i2c)
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{
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struct gpio_regmap_config gconfig = {
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.ngpio = NUM_GPIO,
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.ngpio_per_reg = NUM_GPIO,
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.parent = &i2c->dev,
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.reg_set_base = REG_POWERON,
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};
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struct regmap *regmap;
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struct pwm_chip *pc;
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int ret;
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pc = devm_pwmchip_alloc(&i2c->dev, 1, 0);
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if (IS_ERR(pc))
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return PTR_ERR(pc);
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pc->ops = &rpi_panel_v2_pwm_ops;
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regmap = devm_regmap_init_i2c(i2c, &rpi_panel_regmap_config);
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if (IS_ERR(regmap))
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return dev_err_probe(&i2c->dev, PTR_ERR(regmap), "Failed to allocate regmap\n");
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pwmchip_set_drvdata(pc, regmap);
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regmap_write(regmap, REG_POWERON, 0);
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gconfig.regmap = regmap;
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ret = PTR_ERR_OR_ZERO(devm_gpio_regmap_register(&i2c->dev, &gconfig));
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if (ret)
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return dev_err_probe(&i2c->dev, ret, "Failed to create gpiochip\n");
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i2c_set_clientdata(i2c, regmap);
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return devm_pwmchip_add(&i2c->dev, pc);
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}
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static void rpi_panel_v2_i2c_shutdown(struct i2c_client *client)
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{
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struct regmap *regmap = i2c_get_clientdata(client);
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regmap_write(regmap, REG_PWM, 0);
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regmap_write(regmap, REG_POWERON, 0);
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}
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static const struct of_device_id rpi_panel_v2_dt_ids[] = {
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{ .compatible = "raspberrypi,touchscreen-panel-regulator-v2" },
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{ },
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};
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MODULE_DEVICE_TABLE(of, rpi_panel_v2_dt_ids);
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static struct i2c_driver rpi_panel_v2_regulator_driver = {
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.driver = {
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.name = "rpi_touchscreen_v2",
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.probe_type = PROBE_PREFER_ASYNCHRONOUS,
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.of_match_table = rpi_panel_v2_dt_ids,
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},
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.probe = rpi_panel_v2_i2c_probe,
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.shutdown = rpi_panel_v2_i2c_shutdown,
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};
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module_i2c_driver(rpi_panel_v2_regulator_driver);
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MODULE_AUTHOR("Dave Stevenson <dave.stevenson@raspberrypi.com>");
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MODULE_DESCRIPTION("Regulator device driver for Raspberry Pi 7-inch V2 touchscreen");
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MODULE_LICENSE("GPL");
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