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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/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 

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