1 /* 2 * LED driver for Marvell 88PM860x 3 * 4 * Copyright (C) 2009 Marvell International Ltd. 5 * Haojian Zhuang <haojian.zhuang@marvell.com> 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License version 2 as 9 * published by the Free Software Foundation. 10 * 11 */ 12 13 #include <linux/kernel.h> 14 #include <linux/of.h> 15 #include <linux/platform_device.h> 16 #include <linux/i2c.h> 17 #include <linux/leds.h> 18 #include <linux/slab.h> 19 #include <linux/mfd/88pm860x.h> 20 #include <linux/module.h> 21 22 #define LED_PWM_MASK (0x1F) 23 #define LED_CURRENT_MASK (0x07 << 5) 24 25 #define LED_BLINK_MASK (0x7F) 26 27 #define LED_ON_CONTINUOUS (0x0F << 3) 28 29 #define LED1_BLINK_EN (1 << 1) 30 #define LED2_BLINK_EN (1 << 2) 31 32 struct pm860x_led { 33 struct led_classdev cdev; 34 struct i2c_client *i2c; 35 struct pm860x_chip *chip; 36 struct mutex lock; 37 char name[MFD_NAME_SIZE]; 38 39 int port; 40 int iset; 41 unsigned char brightness; 42 unsigned char current_brightness; 43 44 int reg_control; 45 int reg_blink; 46 int blink_mask; 47 }; 48 49 static int led_power_set(struct pm860x_chip *chip, int port, int on) 50 { 51 int ret = -EINVAL; 52 53 switch (port) { 54 case 0: 55 case 1: 56 case 2: 57 ret = on ? pm8606_osc_enable(chip, RGB1_ENABLE) : 58 pm8606_osc_disable(chip, RGB1_ENABLE); 59 break; 60 case 3: 61 case 4: 62 case 5: 63 ret = on ? pm8606_osc_enable(chip, RGB2_ENABLE) : 64 pm8606_osc_disable(chip, RGB2_ENABLE); 65 break; 66 } 67 return ret; 68 } 69 70 static int pm860x_led_set(struct led_classdev *cdev, 71 enum led_brightness value) 72 { 73 struct pm860x_led *led = container_of(cdev, struct pm860x_led, cdev); 74 struct pm860x_chip *chip; 75 unsigned char buf[3]; 76 int ret; 77 78 chip = led->chip; 79 mutex_lock(&led->lock); 80 led->brightness = value >> 3; 81 82 if ((led->current_brightness == 0) && led->brightness) { 83 led_power_set(chip, led->port, 1); 84 if (led->iset) { 85 pm860x_set_bits(led->i2c, led->reg_control, 86 LED_CURRENT_MASK, led->iset); 87 } 88 pm860x_set_bits(led->i2c, led->reg_blink, 89 LED_BLINK_MASK, LED_ON_CONTINUOUS); 90 pm860x_set_bits(led->i2c, PM8606_WLED3B, led->blink_mask, 91 led->blink_mask); 92 } 93 pm860x_set_bits(led->i2c, led->reg_control, LED_PWM_MASK, 94 led->brightness); 95 96 if (led->brightness == 0) { 97 pm860x_bulk_read(led->i2c, led->reg_control, 3, buf); 98 ret = buf[0] & LED_PWM_MASK; 99 ret |= buf[1] & LED_PWM_MASK; 100 ret |= buf[2] & LED_PWM_MASK; 101 if (ret == 0) { 102 /* unset current since no led is lighting */ 103 pm860x_set_bits(led->i2c, led->reg_control, 104 LED_CURRENT_MASK, 0); 105 pm860x_set_bits(led->i2c, PM8606_WLED3B, 106 led->blink_mask, 0); 107 led_power_set(chip, led->port, 0); 108 } 109 } 110 led->current_brightness = led->brightness; 111 dev_dbg(chip->dev, "Update LED. (reg:%d, brightness:%d)\n", 112 led->reg_control, led->brightness); 113 mutex_unlock(&led->lock); 114 115 return 0; 116 } 117 118 #ifdef CONFIG_OF 119 static int pm860x_led_dt_init(struct platform_device *pdev, 120 struct pm860x_led *data) 121 { 122 struct device_node *nproot, *np; 123 int iset = 0; 124 125 if (!pdev->dev.parent->of_node) 126 return -ENODEV; 127 nproot = of_get_child_by_name(pdev->dev.parent->of_node, "leds"); 128 if (!nproot) { 129 dev_err(&pdev->dev, "failed to find leds node\n"); 130 return -ENODEV; 131 } 132 for_each_child_of_node(nproot, np) { 133 if (!of_node_cmp(np->name, data->name)) { 134 of_property_read_u32(np, "marvell,88pm860x-iset", 135 &iset); 136 data->iset = PM8606_LED_CURRENT(iset); 137 of_node_put(np); 138 break; 139 } 140 } 141 of_node_put(nproot); 142 return 0; 143 } 144 #else 145 #define pm860x_led_dt_init(x, y) (-1) 146 #endif 147 148 static int pm860x_led_probe(struct platform_device *pdev) 149 { 150 struct pm860x_chip *chip = dev_get_drvdata(pdev->dev.parent); 151 struct pm860x_led_pdata *pdata = dev_get_platdata(&pdev->dev); 152 struct pm860x_led *data; 153 struct resource *res; 154 int ret = 0; 155 156 data = devm_kzalloc(&pdev->dev, sizeof(struct pm860x_led), GFP_KERNEL); 157 if (data == NULL) 158 return -ENOMEM; 159 res = platform_get_resource_byname(pdev, IORESOURCE_REG, "control"); 160 if (!res) { 161 dev_err(&pdev->dev, "No REG resource for control\n"); 162 return -ENXIO; 163 } 164 data->reg_control = res->start; 165 res = platform_get_resource_byname(pdev, IORESOURCE_REG, "blink"); 166 if (!res) { 167 dev_err(&pdev->dev, "No REG resource for blink\n"); 168 return -ENXIO; 169 } 170 data->reg_blink = res->start; 171 memset(data->name, 0, MFD_NAME_SIZE); 172 switch (pdev->id) { 173 case 0: 174 data->blink_mask = LED1_BLINK_EN; 175 sprintf(data->name, "led0-red"); 176 break; 177 case 1: 178 data->blink_mask = LED1_BLINK_EN; 179 sprintf(data->name, "led0-green"); 180 break; 181 case 2: 182 data->blink_mask = LED1_BLINK_EN; 183 sprintf(data->name, "led0-blue"); 184 break; 185 case 3: 186 data->blink_mask = LED2_BLINK_EN; 187 sprintf(data->name, "led1-red"); 188 break; 189 case 4: 190 data->blink_mask = LED2_BLINK_EN; 191 sprintf(data->name, "led1-green"); 192 break; 193 case 5: 194 data->blink_mask = LED2_BLINK_EN; 195 sprintf(data->name, "led1-blue"); 196 break; 197 } 198 data->chip = chip; 199 data->i2c = (chip->id == CHIP_PM8606) ? chip->client : chip->companion; 200 data->port = pdev->id; 201 if (pm860x_led_dt_init(pdev, data)) 202 if (pdata) 203 data->iset = pdata->iset; 204 205 data->current_brightness = 0; 206 data->cdev.name = data->name; 207 data->cdev.brightness_set_blocking = pm860x_led_set; 208 mutex_init(&data->lock); 209 210 ret = devm_led_classdev_register(chip->dev, &data->cdev); 211 if (ret < 0) { 212 dev_err(&pdev->dev, "Failed to register LED: %d\n", ret); 213 return ret; 214 } 215 pm860x_led_set(&data->cdev, 0); 216 return 0; 217 } 218 219 220 static struct platform_driver pm860x_led_driver = { 221 .driver = { 222 .name = "88pm860x-led", 223 }, 224 .probe = pm860x_led_probe, 225 }; 226 227 module_platform_driver(pm860x_led_driver); 228 229 MODULE_DESCRIPTION("LED driver for Marvell PM860x"); 230 MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>"); 231 MODULE_LICENSE("GPL"); 232 MODULE_ALIAS("platform:88pm860x-led"); 233