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/init.h> 15 #include <linux/of.h> 16 #include <linux/platform_device.h> 17 #include <linux/i2c.h> 18 #include <linux/leds.h> 19 #include <linux/slab.h> 20 #include <linux/workqueue.h> 21 #include <linux/mfd/88pm860x.h> 22 #include <linux/module.h> 23 24 #define LED_PWM_MASK (0x1F) 25 #define LED_CURRENT_MASK (0x07 << 5) 26 27 #define LED_BLINK_MASK (0x7F) 28 29 #define LED_ON_CONTINUOUS (0x0F << 3) 30 31 #define LED1_BLINK_EN (1 << 1) 32 #define LED2_BLINK_EN (1 << 2) 33 34 struct pm860x_led { 35 struct led_classdev cdev; 36 struct i2c_client *i2c; 37 struct work_struct work; 38 struct pm860x_chip *chip; 39 struct mutex lock; 40 char name[MFD_NAME_SIZE]; 41 42 int port; 43 int iset; 44 unsigned char brightness; 45 unsigned char current_brightness; 46 47 int reg_control; 48 int reg_blink; 49 int blink_mask; 50 }; 51 52 static int led_power_set(struct pm860x_chip *chip, int port, int on) 53 { 54 int ret = -EINVAL; 55 56 switch (port) { 57 case 0: 58 case 1: 59 case 2: 60 ret = on ? pm8606_osc_enable(chip, RGB1_ENABLE) : 61 pm8606_osc_disable(chip, RGB1_ENABLE); 62 break; 63 case 3: 64 case 4: 65 case 5: 66 ret = on ? pm8606_osc_enable(chip, RGB2_ENABLE) : 67 pm8606_osc_disable(chip, RGB2_ENABLE); 68 break; 69 } 70 return ret; 71 } 72 73 static void pm860x_led_work(struct work_struct *work) 74 { 75 76 struct pm860x_led *led; 77 struct pm860x_chip *chip; 78 unsigned char buf[3]; 79 int ret; 80 81 led = container_of(work, struct pm860x_led, work); 82 chip = led->chip; 83 mutex_lock(&led->lock); 84 if ((led->current_brightness == 0) && led->brightness) { 85 led_power_set(chip, led->port, 1); 86 if (led->iset) { 87 pm860x_set_bits(led->i2c, led->reg_control, 88 LED_CURRENT_MASK, led->iset); 89 } 90 pm860x_set_bits(led->i2c, led->reg_blink, 91 LED_BLINK_MASK, LED_ON_CONTINUOUS); 92 pm860x_set_bits(led->i2c, PM8606_WLED3B, led->blink_mask, 93 led->blink_mask); 94 } 95 pm860x_set_bits(led->i2c, led->reg_control, LED_PWM_MASK, 96 led->brightness); 97 98 if (led->brightness == 0) { 99 pm860x_bulk_read(led->i2c, led->reg_control, 3, buf); 100 ret = buf[0] & LED_PWM_MASK; 101 ret |= buf[1] & LED_PWM_MASK; 102 ret |= buf[2] & LED_PWM_MASK; 103 if (ret == 0) { 104 /* unset current since no led is lighting */ 105 pm860x_set_bits(led->i2c, led->reg_control, 106 LED_CURRENT_MASK, 0); 107 pm860x_set_bits(led->i2c, PM8606_WLED3B, 108 led->blink_mask, 0); 109 led_power_set(chip, led->port, 0); 110 } 111 } 112 led->current_brightness = led->brightness; 113 dev_dbg(chip->dev, "Update LED. (reg:%d, brightness:%d)\n", 114 led->reg_control, led->brightness); 115 mutex_unlock(&led->lock); 116 } 117 118 static void pm860x_led_set(struct led_classdev *cdev, 119 enum led_brightness value) 120 { 121 struct pm860x_led *data = container_of(cdev, struct pm860x_led, cdev); 122 123 data->brightness = value >> 3; 124 schedule_work(&data->work); 125 } 126 127 #ifdef CONFIG_OF 128 static int pm860x_led_dt_init(struct platform_device *pdev, 129 struct pm860x_led *data) 130 { 131 struct device_node *nproot, *np; 132 int iset = 0; 133 134 nproot = of_node_get(pdev->dev.parent->of_node); 135 if (!nproot) 136 return -ENODEV; 137 nproot = of_find_node_by_name(nproot, "leds"); 138 if (!nproot) { 139 dev_err(&pdev->dev, "failed to find leds node\n"); 140 return -ENODEV; 141 } 142 for_each_child_of_node(nproot, np) { 143 if (!of_node_cmp(np->name, data->name)) { 144 of_property_read_u32(np, "marvell,88pm860x-iset", 145 &iset); 146 data->iset = PM8606_LED_CURRENT(iset); 147 break; 148 } 149 } 150 of_node_put(nproot); 151 return 0; 152 } 153 #else 154 #define pm860x_led_dt_init(x, y) (-1) 155 #endif 156 157 static int pm860x_led_probe(struct platform_device *pdev) 158 { 159 struct pm860x_chip *chip = dev_get_drvdata(pdev->dev.parent); 160 struct pm860x_led_pdata *pdata = pdev->dev.platform_data; 161 struct pm860x_led *data; 162 struct resource *res; 163 int ret = 0; 164 165 data = devm_kzalloc(&pdev->dev, sizeof(struct pm860x_led), GFP_KERNEL); 166 if (data == NULL) 167 return -ENOMEM; 168 res = platform_get_resource_byname(pdev, IORESOURCE_REG, "control"); 169 if (!res) { 170 dev_err(&pdev->dev, "No REG resource for control\n"); 171 return -ENXIO; 172 } 173 data->reg_control = res->start; 174 res = platform_get_resource_byname(pdev, IORESOURCE_REG, "blink"); 175 if (!res) { 176 dev_err(&pdev->dev, "No REG resource for blink\n"); 177 return -ENXIO; 178 } 179 data->reg_blink = res->start; 180 memset(data->name, 0, MFD_NAME_SIZE); 181 switch (pdev->id) { 182 case 0: 183 data->blink_mask = LED1_BLINK_EN; 184 sprintf(data->name, "led0-red"); 185 break; 186 case 1: 187 data->blink_mask = LED1_BLINK_EN; 188 sprintf(data->name, "led0-green"); 189 break; 190 case 2: 191 data->blink_mask = LED1_BLINK_EN; 192 sprintf(data->name, "led0-blue"); 193 break; 194 case 3: 195 data->blink_mask = LED2_BLINK_EN; 196 sprintf(data->name, "led1-red"); 197 break; 198 case 4: 199 data->blink_mask = LED2_BLINK_EN; 200 sprintf(data->name, "led1-green"); 201 break; 202 case 5: 203 data->blink_mask = LED2_BLINK_EN; 204 sprintf(data->name, "led1-blue"); 205 break; 206 } 207 dev_set_drvdata(&pdev->dev, data); 208 data->chip = chip; 209 data->i2c = (chip->id == CHIP_PM8606) ? chip->client : chip->companion; 210 data->port = pdev->id; 211 if (pm860x_led_dt_init(pdev, data)) 212 if (pdata) 213 data->iset = pdata->iset; 214 215 data->current_brightness = 0; 216 data->cdev.name = data->name; 217 data->cdev.brightness_set = pm860x_led_set; 218 mutex_init(&data->lock); 219 INIT_WORK(&data->work, pm860x_led_work); 220 221 ret = led_classdev_register(chip->dev, &data->cdev); 222 if (ret < 0) { 223 dev_err(&pdev->dev, "Failed to register LED: %d\n", ret); 224 return ret; 225 } 226 pm860x_led_set(&data->cdev, 0); 227 return 0; 228 } 229 230 static int pm860x_led_remove(struct platform_device *pdev) 231 { 232 struct pm860x_led *data = platform_get_drvdata(pdev); 233 234 led_classdev_unregister(&data->cdev); 235 236 return 0; 237 } 238 239 static struct platform_driver pm860x_led_driver = { 240 .driver = { 241 .name = "88pm860x-led", 242 .owner = THIS_MODULE, 243 }, 244 .probe = pm860x_led_probe, 245 .remove = pm860x_led_remove, 246 }; 247 248 module_platform_driver(pm860x_led_driver); 249 250 MODULE_DESCRIPTION("LED driver for Marvell PM860x"); 251 MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>"); 252 MODULE_LICENSE("GPL"); 253 MODULE_ALIAS("platform:88pm860x-led"); 254