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Linux/drivers/leds/leds-88pm860x.c

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

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