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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/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 = dev_get_platdata(&pdev->dev);
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         platform_set_drvdata(pdev, 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 

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