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129 lines
3.4 KiB
129 lines
3.4 KiB
// SPDX-License-Identifier: GPL-2.0+ |
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#include <linux/leds.h> |
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#include <linux/module.h> |
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#include <linux/platform_device.h> |
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#include <linux/regmap.h> |
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#define A500_EC_LED_DELAY_USEC (100 * 1000) |
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enum { |
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REG_RESET_LEDS = 0x40, |
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REG_POWER_LED_ON = 0x42, |
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REG_CHARGE_LED_ON = 0x43, |
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REG_ANDROID_LEDS_OFF = 0x5a, |
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}; |
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struct a500_led { |
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struct led_classdev cdev; |
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const struct reg_sequence *enable_seq; |
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struct a500_led *other; |
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struct regmap *rmap; |
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}; |
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static const struct reg_sequence a500_ec_leds_reset_seq[] = { |
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REG_SEQ(REG_RESET_LEDS, 0x0, A500_EC_LED_DELAY_USEC), |
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REG_SEQ(REG_ANDROID_LEDS_OFF, 0x0, A500_EC_LED_DELAY_USEC), |
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}; |
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static const struct reg_sequence a500_ec_white_led_enable_seq[] = { |
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REG_SEQ(REG_POWER_LED_ON, 0x0, A500_EC_LED_DELAY_USEC), |
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}; |
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static const struct reg_sequence a500_ec_orange_led_enable_seq[] = { |
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REG_SEQ(REG_CHARGE_LED_ON, 0x0, A500_EC_LED_DELAY_USEC), |
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}; |
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static int a500_ec_led_brightness_set(struct led_classdev *led_cdev, |
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enum led_brightness value) |
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{ |
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struct a500_led *led = container_of(led_cdev, struct a500_led, cdev); |
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struct reg_sequence control_seq[2]; |
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unsigned int num_regs = 1; |
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if (value) { |
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control_seq[0] = led->enable_seq[0]; |
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} else { |
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/* |
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* There is no separate controls which can disable LEDs |
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* individually, there is only RESET_LEDS command that turns |
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* off both LEDs. |
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* |
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* RESET_LEDS turns off both LEDs, thus restore other LED if |
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* it's turned ON. |
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*/ |
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if (led->other->cdev.brightness) |
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num_regs = 2; |
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control_seq[0] = a500_ec_leds_reset_seq[0]; |
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control_seq[1] = led->other->enable_seq[0]; |
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} |
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return regmap_multi_reg_write(led->rmap, control_seq, num_regs); |
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} |
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static int a500_ec_leds_probe(struct platform_device *pdev) |
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{ |
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struct a500_led *white_led, *orange_led; |
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struct regmap *rmap; |
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int err; |
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rmap = dev_get_regmap(pdev->dev.parent, "KB930"); |
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if (!rmap) |
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return -EINVAL; |
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/* reset and turn off LEDs */ |
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regmap_multi_reg_write(rmap, a500_ec_leds_reset_seq, 2); |
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white_led = devm_kzalloc(&pdev->dev, sizeof(*white_led), GFP_KERNEL); |
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if (!white_led) |
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return -ENOMEM; |
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white_led->cdev.name = "power:white"; |
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white_led->cdev.brightness_set_blocking = a500_ec_led_brightness_set; |
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white_led->cdev.flags = LED_CORE_SUSPENDRESUME; |
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white_led->cdev.max_brightness = 1; |
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white_led->enable_seq = a500_ec_white_led_enable_seq; |
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white_led->rmap = rmap; |
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orange_led = devm_kzalloc(&pdev->dev, sizeof(*orange_led), GFP_KERNEL); |
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if (!orange_led) |
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return -ENOMEM; |
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orange_led->cdev.name = "power:orange"; |
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orange_led->cdev.brightness_set_blocking = a500_ec_led_brightness_set; |
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orange_led->cdev.flags = LED_CORE_SUSPENDRESUME; |
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orange_led->cdev.max_brightness = 1; |
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orange_led->enable_seq = a500_ec_orange_led_enable_seq; |
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orange_led->rmap = rmap; |
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white_led->other = orange_led; |
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orange_led->other = white_led; |
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err = devm_led_classdev_register(&pdev->dev, &white_led->cdev); |
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if (err) { |
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dev_err(&pdev->dev, "failed to register white LED\n"); |
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return err; |
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} |
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err = devm_led_classdev_register(&pdev->dev, &orange_led->cdev); |
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if (err) { |
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dev_err(&pdev->dev, "failed to register orange LED\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 struct platform_driver a500_ec_leds_driver = { |
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.driver = { |
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.name = "acer-a500-iconia-leds", |
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}, |
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.probe = a500_ec_leds_probe, |
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}; |
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module_platform_driver(a500_ec_leds_driver); |
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MODULE_DESCRIPTION("LED driver for Acer Iconia Tab A500 Power Button"); |
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MODULE_AUTHOR("Dmitry Osipenko <[email protected]>"); |
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MODULE_ALIAS("platform:acer-a500-iconia-leds"); |
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MODULE_LICENSE("GPL");
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