1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * LED driver for Marvell 88PM860x 4 * 5 * Copyright (C) 2009 Marvell International Ltd. 6 * Haojian Zhuang <haojian.zhuang@marvell.com> 7 */ 8 9 #include <linux/kernel.h> 10 #include <linux/of.h> 11 #include <linux/platform_device.h> 12 #include <linux/i2c.h> 13 #include <linux/leds.h> 14 #include <linux/slab.h> 15 #include <linux/mfd/88pm860x.h> 16 #include <linux/module.h> 17 18 #define LED_PWM_MASK (0x1F) 19 #define LED_CURRENT_MASK (0x07 << 5) 20 21 #define LED_BLINK_MASK (0x7F) 22 23 #define LED_ON_CONTINUOUS (0x0F << 3) 24 25 #define LED1_BLINK_EN (1 << 1) 26 #define LED2_BLINK_EN (1 << 2) 27 28 struct pm860x_led { 29 struct led_classdev cdev; 30 struct i2c_client *i2c; 31 struct pm860x_chip *chip; 32 struct mutex lock; 33 char name[MFD_NAME_SIZE]; 34 35 int port; 36 int iset; 37 unsigned char brightness; 38 unsigned char current_brightness; 39 40 int reg_control; 41 int reg_blink; 42 int blink_mask; 43 }; 44 45 static int led_power_set(struct pm860x_chip *chip, int port, int on) 46 { 47 int ret = -EINVAL; 48 49 switch (port) { 50 case 0: 51 case 1: 52 case 2: 53 ret = on ? pm8606_osc_enable(chip, RGB1_ENABLE) : 54 pm8606_osc_disable(chip, RGB1_ENABLE); 55 break; 56 case 3: 57 case 4: 58 case 5: 59 ret = on ? pm8606_osc_enable(chip, RGB2_ENABLE) : 60 pm8606_osc_disable(chip, RGB2_ENABLE); 61 break; 62 } 63 return ret; 64 } 65 66 static int pm860x_led_set(struct led_classdev *cdev, 67 enum led_brightness value) 68 { 69 struct pm860x_led *led = container_of(cdev, struct pm860x_led, cdev); 70 struct pm860x_chip *chip; 71 unsigned char buf[3]; 72 int ret; 73 74 chip = led->chip; 75 mutex_lock(&led->lock); 76 led->brightness = value >> 3; 77 78 if ((led->current_brightness == 0) && led->brightness) { 79 led_power_set(chip, led->port, 1); 80 if (led->iset) { 81 pm860x_set_bits(led->i2c, led->reg_control, 82 LED_CURRENT_MASK, led->iset); 83 } 84 pm860x_set_bits(led->i2c, led->reg_blink, 85 LED_BLINK_MASK, LED_ON_CONTINUOUS); 86 pm860x_set_bits(led->i2c, PM8606_WLED3B, led->blink_mask, 87 led->blink_mask); 88 } 89 pm860x_set_bits(led->i2c, led->reg_control, LED_PWM_MASK, 90 led->brightness); 91 92 if (led->brightness == 0) { 93 pm860x_bulk_read(led->i2c, led->reg_control, 3, buf); 94 ret = buf[0] & LED_PWM_MASK; 95 ret |= buf[1] & LED_PWM_MASK; 96 ret |= buf[2] & LED_PWM_MASK; 97 if (ret == 0) { 98 /* unset current since no led is lighting */ 99 pm860x_set_bits(led->i2c, led->reg_control, 100 LED_CURRENT_MASK, 0); 101 pm860x_set_bits(led->i2c, PM8606_WLED3B, 102 led->blink_mask, 0); 103 led_power_set(chip, led->port, 0); 104 } 105 } 106 led->current_brightness = led->brightness; 107 dev_dbg(chip->dev, "Update LED. (reg:%d, brightness:%d)\n", 108 led->reg_control, led->brightness); 109 mutex_unlock(&led->lock); 110 111 return 0; 112 } 113 114 #ifdef CONFIG_OF 115 static int pm860x_led_dt_init(struct platform_device *pdev, 116 struct pm860x_led *data) 117 { 118 struct device_node *nproot, *np; 119 int iset = 0; 120 121 if (!pdev->dev.parent->of_node) 122 return -ENODEV; 123 nproot = of_get_child_by_name(pdev->dev.parent->of_node, "leds"); 124 if (!nproot) { 125 dev_err(&pdev->dev, "failed to find leds node\n"); 126 return -ENODEV; 127 } 128 for_each_child_of_node(nproot, np) { 129 if (of_node_name_eq(np, data->name)) { 130 of_property_read_u32(np, "marvell,88pm860x-iset", 131 &iset); 132 data->iset = PM8606_LED_CURRENT(iset); 133 of_node_put(np); 134 break; 135 } 136 } 137 of_node_put(nproot); 138 return 0; 139 } 140 #else 141 #define pm860x_led_dt_init(x, y) (-1) 142 #endif 143 144 static int pm860x_led_probe(struct platform_device *pdev) 145 { 146 struct pm860x_chip *chip = dev_get_drvdata(pdev->dev.parent); 147 struct pm860x_led_pdata *pdata = dev_get_platdata(&pdev->dev); 148 struct pm860x_led *data; 149 struct resource *res; 150 int ret = 0; 151 152 data = devm_kzalloc(&pdev->dev, sizeof(struct pm860x_led), GFP_KERNEL); 153 if (data == NULL) 154 return -ENOMEM; 155 res = platform_get_resource_byname(pdev, IORESOURCE_REG, "control"); 156 if (!res) { 157 dev_err(&pdev->dev, "No REG resource for control\n"); 158 return -ENXIO; 159 } 160 data->reg_control = res->start; 161 res = platform_get_resource_byname(pdev, IORESOURCE_REG, "blink"); 162 if (!res) { 163 dev_err(&pdev->dev, "No REG resource for blink\n"); 164 return -ENXIO; 165 } 166 data->reg_blink = res->start; 167 memset(data->name, 0, MFD_NAME_SIZE); 168 switch (pdev->id) { 169 case 0: 170 data->blink_mask = LED1_BLINK_EN; 171 sprintf(data->name, "led0-red"); 172 break; 173 case 1: 174 data->blink_mask = LED1_BLINK_EN; 175 sprintf(data->name, "led0-green"); 176 break; 177 case 2: 178 data->blink_mask = LED1_BLINK_EN; 179 sprintf(data->name, "led0-blue"); 180 break; 181 case 3: 182 data->blink_mask = LED2_BLINK_EN; 183 sprintf(data->name, "led1-red"); 184 break; 185 case 4: 186 data->blink_mask = LED2_BLINK_EN; 187 sprintf(data->name, "led1-green"); 188 break; 189 case 5: 190 data->blink_mask = LED2_BLINK_EN; 191 sprintf(data->name, "led1-blue"); 192 break; 193 } 194 data->chip = chip; 195 data->i2c = (chip->id == CHIP_PM8606) ? chip->client : chip->companion; 196 data->port = pdev->id; 197 if (pm860x_led_dt_init(pdev, data)) 198 if (pdata) 199 data->iset = pdata->iset; 200 201 data->current_brightness = 0; 202 data->cdev.name = data->name; 203 data->cdev.brightness_set_blocking = pm860x_led_set; 204 mutex_init(&data->lock); 205 206 ret = devm_led_classdev_register(chip->dev, &data->cdev); 207 if (ret < 0) { 208 dev_err(&pdev->dev, "Failed to register LED: %d\n", ret); 209 return ret; 210 } 211 pm860x_led_set(&data->cdev, 0); 212 return 0; 213 } 214 215 216 static struct platform_driver pm860x_led_driver = { 217 .driver = { 218 .name = "88pm860x-led", 219 }, 220 .probe = pm860x_led_probe, 221 }; 222 223 module_platform_driver(pm860x_led_driver); 224 225 MODULE_DESCRIPTION("LED driver for Marvell PM860x"); 226 MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>"); 227 MODULE_LICENSE("GPL"); 228 MODULE_ALIAS("platform:88pm860x-led"); 229