]>
Commit | Line | Data |
---|---|---|
d2912cb1 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
d966c943 TM |
2 | /* |
3 | * LED driver for TI lp3952 controller | |
4 | * | |
5 | * Copyright (C) 2016, DAQRI, LLC. | |
6 | * Author: Tony Makkiel <tony.makkiel@daqri.com> | |
d966c943 TM |
7 | */ |
8 | ||
d966c943 | 9 | #include <linux/delay.h> |
da542caf | 10 | #include <linux/gpio/consumer.h> |
d966c943 TM |
11 | #include <linux/i2c.h> |
12 | #include <linux/io.h> | |
13 | #include <linux/kernel.h> | |
14 | #include <linux/leds.h> | |
15 | #include <linux/leds-lp3952.h> | |
16 | #include <linux/module.h> | |
17 | #include <linux/notifier.h> | |
18 | #include <linux/platform_device.h> | |
19 | #include <linux/pm.h> | |
20 | #include <linux/reboot.h> | |
21 | #include <linux/regmap.h> | |
22 | ||
23 | static int lp3952_register_write(struct i2c_client *client, u8 reg, u8 val) | |
24 | { | |
25 | int ret; | |
26 | struct lp3952_led_array *priv = i2c_get_clientdata(client); | |
27 | ||
28 | ret = regmap_write(priv->regmap, reg, val); | |
29 | ||
30 | if (ret) | |
31 | dev_err(&client->dev, "%s: reg 0x%x, val 0x%x, err %d\n", | |
32 | __func__, reg, val, ret); | |
33 | return ret; | |
34 | } | |
35 | ||
36 | static void lp3952_on_off(struct lp3952_led_array *priv, | |
37 | enum lp3952_leds led_id, bool on) | |
38 | { | |
39 | int ret, val; | |
40 | ||
41 | dev_dbg(&priv->client->dev, "%s LED %d to %d\n", __func__, led_id, on); | |
42 | ||
43 | val = 1 << led_id; | |
44 | if (led_id == LP3952_LED_ALL) | |
45 | val = LP3952_LED_MASK_ALL; | |
46 | ||
47 | ret = regmap_update_bits(priv->regmap, LP3952_REG_LED_CTRL, val, | |
48 | on ? val : 0); | |
49 | if (ret) | |
50 | dev_err(&priv->client->dev, "%s, Error %d\n", __func__, ret); | |
51 | } | |
52 | ||
53 | /* | |
54 | * Using Imax to control brightness. There are 4 possible | |
55 | * setting 25, 50, 75 and 100 % of Imax. Possible values are | |
56 | * values 0-4. 0 meaning turn off. | |
57 | */ | |
58 | static int lp3952_set_brightness(struct led_classdev *cdev, | |
59 | enum led_brightness value) | |
60 | { | |
61 | unsigned int reg, shift_val; | |
62 | struct lp3952_ctrl_hdl *led = container_of(cdev, | |
63 | struct lp3952_ctrl_hdl, | |
64 | cdev); | |
65 | struct lp3952_led_array *priv = (struct lp3952_led_array *)led->priv; | |
66 | ||
67 | dev_dbg(cdev->dev, "Brightness request: %d on %d\n", value, | |
68 | led->channel); | |
69 | ||
70 | if (value == LED_OFF) { | |
71 | lp3952_on_off(priv, led->channel, false); | |
72 | return 0; | |
73 | } | |
74 | ||
75 | if (led->channel > LP3952_RED_1) { | |
76 | dev_err(cdev->dev, " %s Invalid LED requested", __func__); | |
77 | return -EINVAL; | |
78 | } | |
79 | ||
80 | if (led->channel >= LP3952_BLUE_1) { | |
81 | reg = LP3952_REG_RGB1_MAX_I_CTRL; | |
82 | shift_val = (led->channel - LP3952_BLUE_1) * 2; | |
83 | } else { | |
84 | reg = LP3952_REG_RGB2_MAX_I_CTRL; | |
85 | shift_val = led->channel * 2; | |
86 | } | |
87 | ||
88 | /* Enable the LED in case it is not enabled already */ | |
89 | lp3952_on_off(priv, led->channel, true); | |
90 | ||
91 | return regmap_update_bits(priv->regmap, reg, 3 << shift_val, | |
92 | --value << shift_val); | |
93 | } | |
94 | ||
95 | static int lp3952_get_label(struct device *dev, const char *label, char *dest) | |
96 | { | |
97 | int ret; | |
98 | const char *str; | |
99 | ||
100 | ret = device_property_read_string(dev, label, &str); | |
f4363d81 AS |
101 | if (ret) |
102 | return ret; | |
d966c943 | 103 | |
f4363d81 AS |
104 | strncpy(dest, str, LP3952_LABEL_MAX_LEN); |
105 | return 0; | |
d966c943 TM |
106 | } |
107 | ||
108 | static int lp3952_register_led_classdev(struct lp3952_led_array *priv) | |
109 | { | |
110 | int i, acpi_ret, ret = -ENODEV; | |
111 | static const char *led_name_hdl[LP3952_LED_ALL] = { | |
112 | "blue2", | |
113 | "green2", | |
114 | "red2", | |
115 | "blue1", | |
116 | "green1", | |
117 | "red1" | |
118 | }; | |
119 | ||
120 | for (i = 0; i < LP3952_LED_ALL; i++) { | |
121 | acpi_ret = lp3952_get_label(&priv->client->dev, led_name_hdl[i], | |
122 | priv->leds[i].name); | |
123 | if (acpi_ret) | |
124 | continue; | |
125 | ||
126 | priv->leds[i].cdev.name = priv->leds[i].name; | |
127 | priv->leds[i].cdev.brightness = LED_OFF; | |
128 | priv->leds[i].cdev.max_brightness = LP3952_BRIGHT_MAX; | |
129 | priv->leds[i].cdev.brightness_set_blocking = | |
130 | lp3952_set_brightness; | |
131 | priv->leds[i].channel = i; | |
132 | priv->leds[i].priv = priv; | |
133 | ||
134 | ret = devm_led_classdev_register(&priv->client->dev, | |
135 | &priv->leds[i].cdev); | |
136 | if (ret < 0) { | |
137 | dev_err(&priv->client->dev, | |
138 | "couldn't register LED %s\n", | |
139 | priv->leds[i].cdev.name); | |
140 | break; | |
141 | } | |
142 | } | |
143 | return ret; | |
144 | } | |
145 | ||
146 | static int lp3952_set_pattern_gen_cmd(struct lp3952_led_array *priv, | |
147 | u8 cmd_index, u8 r, u8 g, u8 b, | |
148 | enum lp3952_tt tt, enum lp3952_cet cet) | |
149 | { | |
150 | int ret; | |
151 | struct ptrn_gen_cmd line = { | |
152 | { | |
153 | { | |
154 | .r = r, | |
155 | .g = g, | |
156 | .b = b, | |
157 | .cet = cet, | |
158 | .tt = tt | |
159 | } | |
160 | } | |
161 | }; | |
162 | ||
163 | if (cmd_index >= LP3952_CMD_REG_COUNT) | |
164 | return -EINVAL; | |
165 | ||
166 | ret = lp3952_register_write(priv->client, | |
167 | LP3952_REG_CMD_0 + cmd_index * 2, | |
168 | line.bytes.msb); | |
169 | if (ret) | |
170 | return ret; | |
171 | ||
172 | return lp3952_register_write(priv->client, | |
173 | LP3952_REG_CMD_0 + cmd_index * 2 + 1, | |
174 | line.bytes.lsb); | |
175 | } | |
176 | ||
177 | static int lp3952_configure(struct lp3952_led_array *priv) | |
178 | { | |
179 | int ret; | |
180 | ||
181 | /* Disable any LEDs on from any previous conf. */ | |
182 | ret = lp3952_register_write(priv->client, LP3952_REG_LED_CTRL, 0); | |
183 | if (ret) | |
184 | return ret; | |
185 | ||
186 | /* enable rgb patter, loop */ | |
187 | ret = lp3952_register_write(priv->client, LP3952_REG_PAT_GEN_CTRL, | |
188 | LP3952_PATRN_LOOP | LP3952_PATRN_GEN_EN); | |
189 | if (ret) | |
190 | return ret; | |
191 | ||
192 | /* Update Bit 6 (Active mode), Select both Led sets, Bit [1:0] */ | |
193 | ret = lp3952_register_write(priv->client, LP3952_REG_ENABLES, | |
194 | LP3952_ACTIVE_MODE | LP3952_INT_B00ST_LDR); | |
195 | if (ret) | |
196 | return ret; | |
197 | ||
198 | /* Set Cmd1 for RGB intensity,cmd and transition time */ | |
199 | return lp3952_set_pattern_gen_cmd(priv, 0, I46, I71, I100, TT0, | |
200 | CET197); | |
201 | } | |
202 | ||
203 | static const struct regmap_config lp3952_regmap = { | |
204 | .reg_bits = 8, | |
205 | .val_bits = 8, | |
206 | .max_register = REG_MAX, | |
207 | .cache_type = REGCACHE_RBTREE, | |
208 | }; | |
209 | ||
210 | static int lp3952_probe(struct i2c_client *client, | |
211 | const struct i2c_device_id *id) | |
212 | { | |
213 | int status; | |
214 | struct lp3952_led_array *priv; | |
215 | ||
216 | priv = devm_kzalloc(&client->dev, sizeof(*priv), GFP_KERNEL); | |
217 | if (!priv) | |
218 | return -ENOMEM; | |
219 | ||
220 | priv->client = client; | |
221 | ||
222 | priv->enable_gpio = devm_gpiod_get(&client->dev, "nrst", | |
223 | GPIOD_OUT_HIGH); | |
224 | if (IS_ERR(priv->enable_gpio)) { | |
225 | status = PTR_ERR(priv->enable_gpio); | |
226 | dev_err(&client->dev, "Failed to enable gpio: %d\n", status); | |
227 | return status; | |
228 | } | |
229 | ||
230 | priv->regmap = devm_regmap_init_i2c(client, &lp3952_regmap); | |
231 | if (IS_ERR(priv->regmap)) { | |
232 | int err = PTR_ERR(priv->regmap); | |
233 | ||
234 | dev_err(&client->dev, "Failed to allocate register map: %d\n", | |
235 | err); | |
236 | return err; | |
237 | } | |
238 | ||
239 | i2c_set_clientdata(client, priv); | |
240 | ||
241 | status = lp3952_configure(priv); | |
242 | if (status) { | |
243 | dev_err(&client->dev, "Probe failed. Device not found (%d)\n", | |
244 | status); | |
245 | return status; | |
246 | } | |
247 | ||
248 | status = lp3952_register_led_classdev(priv); | |
249 | if (status) { | |
250 | dev_err(&client->dev, "Unable to register led_classdev: %d\n", | |
251 | status); | |
252 | return status; | |
253 | } | |
254 | ||
255 | return 0; | |
256 | } | |
257 | ||
258 | static int lp3952_remove(struct i2c_client *client) | |
259 | { | |
260 | struct lp3952_led_array *priv; | |
261 | ||
262 | priv = i2c_get_clientdata(client); | |
263 | lp3952_on_off(priv, LP3952_LED_ALL, false); | |
264 | gpiod_set_value(priv->enable_gpio, 0); | |
265 | ||
266 | return 0; | |
267 | } | |
268 | ||
269 | static const struct i2c_device_id lp3952_id[] = { | |
270 | {LP3952_NAME, 0}, | |
271 | {} | |
272 | }; | |
aa73684c | 273 | MODULE_DEVICE_TABLE(i2c, lp3952_id); |
d966c943 | 274 | |
d966c943 TM |
275 | static struct i2c_driver lp3952_i2c_driver = { |
276 | .driver = { | |
277 | .name = LP3952_NAME, | |
d966c943 TM |
278 | }, |
279 | .probe = lp3952_probe, | |
280 | .remove = lp3952_remove, | |
281 | .id_table = lp3952_id, | |
282 | }; | |
283 | ||
284 | module_i2c_driver(lp3952_i2c_driver); | |
285 | ||
286 | MODULE_AUTHOR("Tony Makkiel <tony.makkiel@daqri.com>"); | |
287 | MODULE_DESCRIPTION("lp3952 I2C LED controller driver"); | |
288 | MODULE_LICENSE("GPL v2"); |