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ee4e80b2 IG |
1 | // SPDX-License-Identifier: GPL-2.0-only |
2 | /* | |
3 | * LED driver for PCA995x I2C LED drivers | |
4 | * | |
5 | * Copyright 2011 bct electronic GmbH | |
6 | * Copyright 2013 Qtechnology/AS | |
7 | * Copyright 2022 NXP | |
8 | * Copyright 2023 Marek Vasut | |
9 | */ | |
10 | ||
11 | #include <linux/i2c.h> | |
12 | #include <linux/leds.h> | |
13 | #include <linux/module.h> | |
14 | #include <linux/mod_devicetable.h> | |
15 | #include <linux/property.h> | |
16 | #include <linux/regmap.h> | |
17 | ||
18 | /* Register definition */ | |
19 | #define PCA995X_MODE1 0x00 | |
20 | #define PCA995X_MODE2 0x01 | |
21 | #define PCA995X_LEDOUT0 0x02 | |
22 | #define PCA9955B_PWM0 0x08 | |
23 | #define PCA9952_PWM0 0x0A | |
24 | #define PCA9952_IREFALL 0x43 | |
25 | #define PCA9955B_IREFALL 0x45 | |
26 | ||
27 | /* Auto-increment disabled. Normal mode */ | |
28 | #define PCA995X_MODE1_CFG 0x00 | |
29 | ||
30 | /* LED select registers determine the source that drives LED outputs */ | |
31 | #define PCA995X_LED_OFF 0x0 | |
32 | #define PCA995X_LED_ON 0x1 | |
33 | #define PCA995X_LED_PWM_MODE 0x2 | |
34 | #define PCA995X_LDRX_MASK 0x3 | |
35 | #define PCA995X_LDRX_BITS 2 | |
36 | ||
37 | #define PCA995X_MAX_OUTPUTS 16 | |
38 | #define PCA995X_OUTPUTS_PER_REG 4 | |
39 | ||
40 | #define PCA995X_IREFALL_FULL_CFG 0xFF | |
41 | #define PCA995X_IREFALL_HALF_CFG (PCA995X_IREFALL_FULL_CFG / 2) | |
42 | ||
43 | #define PCA995X_TYPE_NON_B 0 | |
44 | #define PCA995X_TYPE_B 1 | |
45 | ||
46 | #define ldev_to_led(c) container_of(c, struct pca995x_led, ldev) | |
47 | ||
48 | struct pca995x_led { | |
49 | unsigned int led_no; | |
50 | struct led_classdev ldev; | |
51 | struct pca995x_chip *chip; | |
52 | }; | |
53 | ||
54 | struct pca995x_chip { | |
55 | struct regmap *regmap; | |
56 | struct pca995x_led leds[PCA995X_MAX_OUTPUTS]; | |
57 | int btype; | |
58 | }; | |
59 | ||
60 | static int pca995x_brightness_set(struct led_classdev *led_cdev, | |
61 | enum led_brightness brightness) | |
62 | { | |
63 | struct pca995x_led *led = ldev_to_led(led_cdev); | |
64 | struct pca995x_chip *chip = led->chip; | |
65 | u8 ledout_addr, pwmout_addr; | |
66 | int shift, ret; | |
67 | ||
68 | pwmout_addr = (chip->btype ? PCA9955B_PWM0 : PCA9952_PWM0) + led->led_no; | |
69 | ledout_addr = PCA995X_LEDOUT0 + (led->led_no / PCA995X_OUTPUTS_PER_REG); | |
70 | shift = PCA995X_LDRX_BITS * (led->led_no % PCA995X_OUTPUTS_PER_REG); | |
71 | ||
72 | switch (brightness) { | |
73 | case LED_FULL: | |
74 | return regmap_update_bits(chip->regmap, ledout_addr, | |
75 | PCA995X_LDRX_MASK << shift, | |
76 | PCA995X_LED_ON << shift); | |
77 | case LED_OFF: | |
78 | return regmap_update_bits(chip->regmap, ledout_addr, | |
79 | PCA995X_LDRX_MASK << shift, 0); | |
80 | default: | |
81 | /* Adjust brightness as per user input by changing individual PWM */ | |
82 | ret = regmap_write(chip->regmap, pwmout_addr, brightness); | |
83 | if (ret) | |
84 | return ret; | |
85 | ||
86 | /* | |
87 | * Change LDRx configuration to individual brightness via PWM. | |
88 | * LED will stop blinking if it's doing so. | |
89 | */ | |
90 | return regmap_update_bits(chip->regmap, ledout_addr, | |
91 | PCA995X_LDRX_MASK << shift, | |
92 | PCA995X_LED_PWM_MODE << shift); | |
93 | } | |
94 | } | |
95 | ||
96 | static const struct regmap_config pca995x_regmap = { | |
97 | .reg_bits = 8, | |
98 | .val_bits = 8, | |
99 | .max_register = 0x49, | |
100 | }; | |
101 | ||
102 | static int pca995x_probe(struct i2c_client *client) | |
103 | { | |
104 | struct fwnode_handle *led_fwnodes[PCA995X_MAX_OUTPUTS] = { 0 }; | |
105 | struct fwnode_handle *np, *child; | |
106 | struct device *dev = &client->dev; | |
107 | struct pca995x_chip *chip; | |
108 | struct pca995x_led *led; | |
109 | int i, btype, reg, ret; | |
110 | ||
111 | btype = (unsigned long)device_get_match_data(&client->dev); | |
112 | ||
113 | np = dev_fwnode(dev); | |
114 | if (!np) | |
115 | return -ENODEV; | |
116 | ||
117 | chip = devm_kzalloc(dev, sizeof(*chip), GFP_KERNEL); | |
118 | if (!chip) | |
119 | return -ENOMEM; | |
120 | ||
121 | chip->btype = btype; | |
122 | chip->regmap = devm_regmap_init_i2c(client, &pca995x_regmap); | |
123 | if (IS_ERR(chip->regmap)) | |
124 | return PTR_ERR(chip->regmap); | |
125 | ||
126 | i2c_set_clientdata(client, chip); | |
127 | ||
128 | fwnode_for_each_available_child_node(np, child) { | |
129 | ret = fwnode_property_read_u32(child, "reg", ®); | |
130 | if (ret) { | |
131 | fwnode_handle_put(child); | |
132 | return ret; | |
133 | } | |
134 | ||
135 | if (reg < 0 || reg >= PCA995X_MAX_OUTPUTS || led_fwnodes[reg]) { | |
136 | fwnode_handle_put(child); | |
137 | return -EINVAL; | |
138 | } | |
139 | ||
140 | led = &chip->leds[reg]; | |
141 | led_fwnodes[reg] = child; | |
142 | led->chip = chip; | |
143 | led->led_no = reg; | |
144 | led->ldev.brightness_set_blocking = pca995x_brightness_set; | |
145 | led->ldev.max_brightness = 255; | |
146 | } | |
147 | ||
148 | for (i = 0; i < PCA995X_MAX_OUTPUTS; i++) { | |
149 | struct led_init_data init_data = {}; | |
150 | ||
151 | if (!led_fwnodes[i]) | |
152 | continue; | |
153 | ||
154 | init_data.fwnode = led_fwnodes[i]; | |
155 | ||
156 | ret = devm_led_classdev_register_ext(dev, | |
157 | &chip->leds[i].ldev, | |
158 | &init_data); | |
159 | if (ret < 0) { | |
160 | fwnode_handle_put(child); | |
161 | return dev_err_probe(dev, ret, | |
162 | "Could not register LED %s\n", | |
163 | chip->leds[i].ldev.name); | |
164 | } | |
165 | } | |
166 | ||
167 | /* Disable LED all-call address and set normal mode */ | |
168 | ret = regmap_write(chip->regmap, PCA995X_MODE1, PCA995X_MODE1_CFG); | |
169 | if (ret) | |
170 | return ret; | |
171 | ||
172 | /* IREF Output current value for all LEDn outputs */ | |
173 | return regmap_write(chip->regmap, | |
174 | btype ? PCA9955B_IREFALL : PCA9952_IREFALL, | |
175 | PCA995X_IREFALL_HALF_CFG); | |
176 | } | |
177 | ||
178 | static const struct i2c_device_id pca995x_id[] = { | |
179 | { "pca9952", .driver_data = (kernel_ulong_t)PCA995X_TYPE_NON_B }, | |
180 | { "pca9955b", .driver_data = (kernel_ulong_t)PCA995X_TYPE_B }, | |
181 | {} | |
182 | }; | |
183 | MODULE_DEVICE_TABLE(i2c, pca995x_id); | |
184 | ||
185 | static const struct of_device_id pca995x_of_match[] = { | |
186 | { .compatible = "nxp,pca9952", .data = (void *)PCA995X_TYPE_NON_B }, | |
187 | { .compatible = "nxp,pca9955b", .data = (void *)PCA995X_TYPE_B }, | |
188 | {}, | |
189 | }; | |
179507fc | 190 | MODULE_DEVICE_TABLE(of, pca995x_of_match); |
ee4e80b2 IG |
191 | |
192 | static struct i2c_driver pca995x_driver = { | |
193 | .driver = { | |
194 | .name = "leds-pca995x", | |
195 | .of_match_table = pca995x_of_match, | |
196 | }, | |
197 | .probe = pca995x_probe, | |
198 | .id_table = pca995x_id, | |
199 | }; | |
200 | module_i2c_driver(pca995x_driver); | |
201 | ||
202 | MODULE_AUTHOR("Isai Gaspar <isaiezequiel.gaspar@nxp.com>"); | |
203 | MODULE_DESCRIPTION("PCA995x LED driver"); | |
204 | MODULE_LICENSE("GPL"); |