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d07e8bf8 HZ |
1 | /* |
2 | * Backlight driver for Marvell Semiconductor 88PM8606 | |
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 | #include <linux/init.h> | |
13 | #include <linux/kernel.h> | |
2e57d567 | 14 | #include <linux/of.h> |
d07e8bf8 | 15 | #include <linux/platform_device.h> |
adb70483 | 16 | #include <linux/slab.h> |
d07e8bf8 HZ |
17 | #include <linux/fb.h> |
18 | #include <linux/i2c.h> | |
19 | #include <linux/backlight.h> | |
20 | #include <linux/mfd/88pm860x.h> | |
355b200b | 21 | #include <linux/module.h> |
d07e8bf8 HZ |
22 | |
23 | #define MAX_BRIGHTNESS (0xFF) | |
24 | #define MIN_BRIGHTNESS (0) | |
25 | ||
2550326a | 26 | #define CURRENT_BITMASK (0x1F << 1) |
d07e8bf8 HZ |
27 | |
28 | struct pm860x_backlight_data { | |
29 | struct pm860x_chip *chip; | |
30 | struct i2c_client *i2c; | |
31 | int current_brightness; | |
32 | int port; | |
33 | int pwm; | |
34 | int iset; | |
a6ccdcd9 HZ |
35 | int reg_duty_cycle; |
36 | int reg_always_on; | |
37 | int reg_current; | |
d07e8bf8 HZ |
38 | }; |
39 | ||
1efc1581 JZ |
40 | static int backlight_power_set(struct pm860x_chip *chip, int port, |
41 | int on) | |
42 | { | |
43 | int ret = -EINVAL; | |
44 | ||
45 | switch (port) { | |
a6ccdcd9 | 46 | case 0: |
1efc1581 JZ |
47 | ret = on ? pm8606_osc_enable(chip, WLED1_DUTY) : |
48 | pm8606_osc_disable(chip, WLED1_DUTY); | |
49 | break; | |
a6ccdcd9 | 50 | case 1: |
1efc1581 JZ |
51 | ret = on ? pm8606_osc_enable(chip, WLED2_DUTY) : |
52 | pm8606_osc_disable(chip, WLED2_DUTY); | |
53 | break; | |
a6ccdcd9 | 54 | case 2: |
1efc1581 JZ |
55 | ret = on ? pm8606_osc_enable(chip, WLED3_DUTY) : |
56 | pm8606_osc_disable(chip, WLED3_DUTY); | |
57 | break; | |
58 | } | |
59 | return ret; | |
60 | } | |
61 | ||
d07e8bf8 HZ |
62 | static int pm860x_backlight_set(struct backlight_device *bl, int brightness) |
63 | { | |
64 | struct pm860x_backlight_data *data = bl_get_data(bl); | |
65 | struct pm860x_chip *chip = data->chip; | |
66 | unsigned char value; | |
67 | int ret; | |
68 | ||
69 | if (brightness > MAX_BRIGHTNESS) | |
70 | value = MAX_BRIGHTNESS; | |
71 | else | |
72 | value = brightness; | |
73 | ||
1efc1581 JZ |
74 | if (brightness) |
75 | backlight_power_set(chip, data->port, 1); | |
76 | ||
a6ccdcd9 | 77 | ret = pm860x_reg_write(data->i2c, data->reg_duty_cycle, value); |
d07e8bf8 HZ |
78 | if (ret < 0) |
79 | goto out; | |
80 | ||
81 | if ((data->current_brightness == 0) && brightness) { | |
82 | if (data->iset) { | |
a6ccdcd9 | 83 | ret = pm860x_set_bits(data->i2c, data->reg_current, |
2550326a | 84 | CURRENT_BITMASK, data->iset); |
d07e8bf8 HZ |
85 | if (ret < 0) |
86 | goto out; | |
87 | } | |
88 | if (data->pwm) { | |
89 | ret = pm860x_set_bits(data->i2c, PM8606_PWM, | |
90 | PM8606_PWM_FREQ_MASK, data->pwm); | |
91 | if (ret < 0) | |
92 | goto out; | |
93 | } | |
94 | if (brightness == MAX_BRIGHTNESS) { | |
95 | /* set WLED_ON bit as 100% */ | |
a6ccdcd9 | 96 | ret = pm860x_set_bits(data->i2c, data->reg_always_on, |
d07e8bf8 HZ |
97 | PM8606_WLED_ON, PM8606_WLED_ON); |
98 | } | |
99 | } else { | |
100 | if (brightness == MAX_BRIGHTNESS) { | |
101 | /* set WLED_ON bit as 100% */ | |
a6ccdcd9 | 102 | ret = pm860x_set_bits(data->i2c, data->reg_always_on, |
d07e8bf8 HZ |
103 | PM8606_WLED_ON, PM8606_WLED_ON); |
104 | } else { | |
105 | /* clear WLED_ON bit since it's not 100% */ | |
a6ccdcd9 | 106 | ret = pm860x_set_bits(data->i2c, data->reg_always_on, |
d07e8bf8 HZ |
107 | PM8606_WLED_ON, 0); |
108 | } | |
109 | } | |
110 | if (ret < 0) | |
111 | goto out; | |
112 | ||
1efc1581 JZ |
113 | if (brightness == 0) |
114 | backlight_power_set(chip, data->port, 0); | |
115 | ||
d07e8bf8 HZ |
116 | dev_dbg(chip->dev, "set brightness %d\n", value); |
117 | data->current_brightness = value; | |
118 | return 0; | |
119 | out: | |
20c5a932 JH |
120 | dev_dbg(chip->dev, "set brightness %d failure with return value: %d\n", |
121 | value, ret); | |
d07e8bf8 HZ |
122 | return ret; |
123 | } | |
124 | ||
125 | static int pm860x_backlight_update_status(struct backlight_device *bl) | |
126 | { | |
127 | int brightness = bl->props.brightness; | |
128 | ||
129 | if (bl->props.power != FB_BLANK_UNBLANK) | |
130 | brightness = 0; | |
131 | ||
132 | if (bl->props.fb_blank != FB_BLANK_UNBLANK) | |
133 | brightness = 0; | |
134 | ||
135 | if (bl->props.state & BL_CORE_SUSPENDED) | |
136 | brightness = 0; | |
137 | ||
138 | return pm860x_backlight_set(bl, brightness); | |
139 | } | |
140 | ||
141 | static int pm860x_backlight_get_brightness(struct backlight_device *bl) | |
142 | { | |
143 | struct pm860x_backlight_data *data = bl_get_data(bl); | |
144 | struct pm860x_chip *chip = data->chip; | |
145 | int ret; | |
146 | ||
a6ccdcd9 | 147 | ret = pm860x_reg_read(data->i2c, data->reg_duty_cycle); |
d07e8bf8 HZ |
148 | if (ret < 0) |
149 | goto out; | |
150 | data->current_brightness = ret; | |
151 | dev_dbg(chip->dev, "get brightness %d\n", data->current_brightness); | |
152 | return data->current_brightness; | |
153 | out: | |
154 | return -EINVAL; | |
155 | } | |
156 | ||
acc2472e | 157 | static const struct backlight_ops pm860x_backlight_ops = { |
d07e8bf8 HZ |
158 | .options = BL_CORE_SUSPENDRESUME, |
159 | .update_status = pm860x_backlight_update_status, | |
160 | .get_brightness = pm860x_backlight_get_brightness, | |
161 | }; | |
162 | ||
2e57d567 HZ |
163 | #ifdef CONFIG_OF |
164 | static int pm860x_backlight_dt_init(struct platform_device *pdev, | |
165 | struct pm860x_backlight_data *data, | |
166 | char *name) | |
167 | { | |
c84c3833 | 168 | struct device_node *nproot, *np; |
2e57d567 | 169 | int iset = 0; |
c84c3833 AL |
170 | |
171 | nproot = of_node_get(pdev->dev.parent->of_node); | |
2e57d567 HZ |
172 | if (!nproot) |
173 | return -ENODEV; | |
174 | nproot = of_find_node_by_name(nproot, "backlights"); | |
175 | if (!nproot) { | |
176 | dev_err(&pdev->dev, "failed to find backlights node\n"); | |
177 | return -ENODEV; | |
178 | } | |
179 | for_each_child_of_node(nproot, np) { | |
180 | if (!of_node_cmp(np->name, name)) { | |
181 | of_property_read_u32(np, "marvell,88pm860x-iset", | |
182 | &iset); | |
183 | data->iset = PM8606_WLED_CURRENT(iset); | |
184 | of_property_read_u32(np, "marvell,88pm860x-pwm", | |
185 | &data->pwm); | |
186 | break; | |
187 | } | |
188 | } | |
c84c3833 | 189 | of_node_put(nproot); |
2e57d567 HZ |
190 | return 0; |
191 | } | |
192 | #else | |
193 | #define pm860x_backlight_dt_init(x, y, z) (-1) | |
194 | #endif | |
195 | ||
d07e8bf8 HZ |
196 | static int pm860x_backlight_probe(struct platform_device *pdev) |
197 | { | |
198 | struct pm860x_chip *chip = dev_get_drvdata(pdev->dev.parent); | |
c512794c | 199 | struct pm860x_backlight_pdata *pdata = dev_get_platdata(&pdev->dev); |
d07e8bf8 HZ |
200 | struct pm860x_backlight_data *data; |
201 | struct backlight_device *bl; | |
202 | struct resource *res; | |
a19a6ee6 | 203 | struct backlight_properties props; |
d07e8bf8 | 204 | char name[MFD_NAME_SIZE]; |
a6ccdcd9 | 205 | int ret = 0; |
d07e8bf8 | 206 | |
ce969228 JL |
207 | data = devm_kzalloc(&pdev->dev, sizeof(struct pm860x_backlight_data), |
208 | GFP_KERNEL); | |
d07e8bf8 HZ |
209 | if (data == NULL) |
210 | return -ENOMEM; | |
a6ccdcd9 HZ |
211 | res = platform_get_resource_byname(pdev, IORESOURCE_REG, "duty cycle"); |
212 | if (!res) { | |
213 | dev_err(&pdev->dev, "No REG resource for duty cycle\n"); | |
3a1f9462 | 214 | return -ENXIO; |
a6ccdcd9 HZ |
215 | } |
216 | data->reg_duty_cycle = res->start; | |
217 | res = platform_get_resource_byname(pdev, IORESOURCE_REG, "always on"); | |
218 | if (!res) { | |
1a84db56 | 219 | dev_err(&pdev->dev, "No REG resource for always on\n"); |
3a1f9462 | 220 | return -ENXIO; |
a6ccdcd9 HZ |
221 | } |
222 | data->reg_always_on = res->start; | |
223 | res = platform_get_resource_byname(pdev, IORESOURCE_REG, "current"); | |
224 | if (!res) { | |
225 | dev_err(&pdev->dev, "No REG resource for current\n"); | |
3a1f9462 | 226 | return -ENXIO; |
a6ccdcd9 HZ |
227 | } |
228 | data->reg_current = res->start; | |
229 | ||
230 | memset(name, 0, MFD_NAME_SIZE); | |
231 | sprintf(name, "backlight-%d", pdev->id); | |
232 | data->port = pdev->id; | |
d07e8bf8 | 233 | data->chip = chip; |
2fe2380e | 234 | data->i2c = (chip->id == CHIP_PM8606) ? chip->client : chip->companion; |
d07e8bf8 | 235 | data->current_brightness = MAX_BRIGHTNESS; |
2e57d567 HZ |
236 | if (pm860x_backlight_dt_init(pdev, data, name)) { |
237 | if (pdata) { | |
238 | data->pwm = pdata->pwm; | |
239 | data->iset = pdata->iset; | |
240 | } | |
d07e8bf8 HZ |
241 | } |
242 | ||
a19a6ee6 | 243 | memset(&props, 0, sizeof(struct backlight_properties)); |
bb7ca747 | 244 | props.type = BACKLIGHT_RAW; |
a19a6ee6 | 245 | props.max_brightness = MAX_BRIGHTNESS; |
f829c9ef | 246 | bl = devm_backlight_device_register(&pdev->dev, name, &pdev->dev, data, |
a19a6ee6 | 247 | &pm860x_backlight_ops, &props); |
d07e8bf8 HZ |
248 | if (IS_ERR(bl)) { |
249 | dev_err(&pdev->dev, "failed to register backlight\n"); | |
d07e8bf8 HZ |
250 | return PTR_ERR(bl); |
251 | } | |
d07e8bf8 HZ |
252 | bl->props.brightness = MAX_BRIGHTNESS; |
253 | ||
254 | platform_set_drvdata(pdev, bl); | |
255 | ||
d07e8bf8 HZ |
256 | /* read current backlight */ |
257 | ret = pm860x_backlight_get_brightness(bl); | |
258 | if (ret < 0) | |
f829c9ef | 259 | return ret; |
d07e8bf8 HZ |
260 | |
261 | backlight_update_status(bl); | |
262 | return 0; | |
d07e8bf8 HZ |
263 | } |
264 | ||
265 | static struct platform_driver pm860x_backlight_driver = { | |
266 | .driver = { | |
267 | .name = "88pm860x-backlight", | |
d07e8bf8 HZ |
268 | }, |
269 | .probe = pm860x_backlight_probe, | |
d07e8bf8 HZ |
270 | }; |
271 | ||
81178e02 | 272 | module_platform_driver(pm860x_backlight_driver); |
d07e8bf8 HZ |
273 | |
274 | MODULE_DESCRIPTION("Backlight Driver for Marvell Semiconductor 88PM8606"); | |
275 | MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>"); | |
276 | MODULE_LICENSE("GPL"); | |
277 | MODULE_ALIAS("platform:88pm860x-backlight"); |