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191 lines
4.4 KiB
191 lines
4.4 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* LED Driver for Dialog DA9052 PMICs. |
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* |
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* Copyright(c) 2012 Dialog Semiconductor Ltd. |
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* |
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* Author: David Dajun Chen <[email protected]> |
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*/ |
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#include <linux/module.h> |
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#include <linux/kernel.h> |
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#include <linux/platform_device.h> |
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#include <linux/leds.h> |
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#include <linux/slab.h> |
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#include <linux/mfd/da9052/reg.h> |
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#include <linux/mfd/da9052/da9052.h> |
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#include <linux/mfd/da9052/pdata.h> |
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#define DA9052_OPENDRAIN_OUTPUT 2 |
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#define DA9052_SET_HIGH_LVL_OUTPUT (1 << 3) |
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#define DA9052_MASK_UPPER_NIBBLE 0xF0 |
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#define DA9052_MASK_LOWER_NIBBLE 0x0F |
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#define DA9052_NIBBLE_SHIFT 4 |
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#define DA9052_MAX_BRIGHTNESS 0x5f |
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struct da9052_led { |
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struct led_classdev cdev; |
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struct da9052 *da9052; |
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unsigned char led_index; |
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unsigned char id; |
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}; |
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static unsigned char led_reg[] = { |
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DA9052_LED_CONT_4_REG, |
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DA9052_LED_CONT_5_REG, |
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}; |
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static int da9052_set_led_brightness(struct da9052_led *led, |
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enum led_brightness brightness) |
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{ |
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u8 val; |
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int error; |
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val = (brightness & 0x7f) | DA9052_LED_CONT_DIM; |
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error = da9052_reg_write(led->da9052, led_reg[led->led_index], val); |
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if (error < 0) |
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dev_err(led->da9052->dev, "Failed to set led brightness, %d\n", |
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error); |
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return error; |
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} |
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static int da9052_led_set(struct led_classdev *led_cdev, |
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enum led_brightness value) |
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{ |
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struct da9052_led *led = |
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container_of(led_cdev, struct da9052_led, cdev); |
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return da9052_set_led_brightness(led, value); |
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} |
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static int da9052_configure_leds(struct da9052 *da9052) |
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{ |
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int error; |
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unsigned char register_value = DA9052_OPENDRAIN_OUTPUT |
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| DA9052_SET_HIGH_LVL_OUTPUT; |
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error = da9052_reg_update(da9052, DA9052_GPIO_14_15_REG, |
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DA9052_MASK_LOWER_NIBBLE, |
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register_value); |
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if (error < 0) { |
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dev_err(da9052->dev, "Failed to write GPIO 14-15 reg, %d\n", |
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error); |
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return error; |
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} |
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error = da9052_reg_update(da9052, DA9052_GPIO_14_15_REG, |
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DA9052_MASK_UPPER_NIBBLE, |
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register_value << DA9052_NIBBLE_SHIFT); |
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if (error < 0) |
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dev_err(da9052->dev, "Failed to write GPIO 14-15 reg, %d\n", |
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error); |
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return error; |
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} |
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static int da9052_led_probe(struct platform_device *pdev) |
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{ |
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struct da9052_pdata *pdata; |
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struct da9052 *da9052; |
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struct led_platform_data *pled; |
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struct da9052_led *led = NULL; |
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int error = -ENODEV; |
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int i; |
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da9052 = dev_get_drvdata(pdev->dev.parent); |
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pdata = dev_get_platdata(da9052->dev); |
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if (pdata == NULL) { |
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dev_err(&pdev->dev, "No platform data\n"); |
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goto err; |
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} |
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pled = pdata->pled; |
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if (pled == NULL) { |
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dev_err(&pdev->dev, "No platform data for LED\n"); |
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goto err; |
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} |
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led = devm_kcalloc(&pdev->dev, |
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pled->num_leds, sizeof(struct da9052_led), |
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GFP_KERNEL); |
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if (!led) { |
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error = -ENOMEM; |
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goto err; |
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} |
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for (i = 0; i < pled->num_leds; i++) { |
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led[i].cdev.name = pled->leds[i].name; |
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led[i].cdev.brightness_set_blocking = da9052_led_set; |
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led[i].cdev.brightness = LED_OFF; |
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led[i].cdev.max_brightness = DA9052_MAX_BRIGHTNESS; |
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led[i].led_index = pled->leds[i].flags; |
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led[i].da9052 = dev_get_drvdata(pdev->dev.parent); |
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error = led_classdev_register(pdev->dev.parent, &led[i].cdev); |
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if (error) { |
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dev_err(&pdev->dev, "Failed to register led %d\n", |
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led[i].led_index); |
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goto err_register; |
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} |
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error = da9052_set_led_brightness(&led[i], |
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led[i].cdev.brightness); |
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if (error) { |
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dev_err(&pdev->dev, "Unable to init led %d\n", |
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led[i].led_index); |
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continue; |
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} |
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} |
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error = da9052_configure_leds(led->da9052); |
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if (error) { |
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dev_err(&pdev->dev, "Failed to configure GPIO LED%d\n", error); |
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goto err_register; |
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} |
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platform_set_drvdata(pdev, led); |
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return 0; |
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err_register: |
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for (i = i - 1; i >= 0; i--) |
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led_classdev_unregister(&led[i].cdev); |
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err: |
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return error; |
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} |
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static int da9052_led_remove(struct platform_device *pdev) |
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{ |
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struct da9052_led *led = platform_get_drvdata(pdev); |
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struct da9052_pdata *pdata; |
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struct da9052 *da9052; |
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struct led_platform_data *pled; |
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int i; |
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da9052 = dev_get_drvdata(pdev->dev.parent); |
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pdata = dev_get_platdata(da9052->dev); |
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pled = pdata->pled; |
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for (i = 0; i < pled->num_leds; i++) { |
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da9052_set_led_brightness(&led[i], LED_OFF); |
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led_classdev_unregister(&led[i].cdev); |
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} |
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return 0; |
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} |
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static struct platform_driver da9052_led_driver = { |
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.driver = { |
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.name = "da9052-leds", |
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}, |
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.probe = da9052_led_probe, |
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.remove = da9052_led_remove, |
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}; |
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module_platform_driver(da9052_led_driver); |
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MODULE_AUTHOR("Dialog Semiconductor Ltd <[email protected]>"); |
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MODULE_DESCRIPTION("LED driver for Dialog DA9052 PMIC"); |
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MODULE_LICENSE("GPL");
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