Commit | Line | Data |
---|---|---|
aa765647 PU |
1 | /* |
2 | * Driver for TWL4030/6030 Pulse Width Modulator used as LED driver | |
3 | * | |
4 | * Copyright (C) 2012 Texas Instruments | |
5 | * Author: Peter Ujfalusi <peter.ujfalusi@ti.com> | |
6 | * | |
7 | * This driver is a complete rewrite of the former pwm-twl6030.c authorded by: | |
8 | * Hemanth V <hemanthv@ti.com> | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or modify it | |
11 | * under the terms of the GNU General Public License version 2 as published by | |
12 | * the Free Software Foundation. | |
13 | * | |
14 | * This program is distributed in the hope that it will be useful, but WITHOUT | |
15 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
16 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
17 | * more details. | |
18 | * | |
19 | * You should have received a copy of the GNU General Public License along with | |
20 | * this program. If not, see <http://www.gnu.org/licenses/>. | |
21 | */ | |
22 | ||
23 | #include <linux/module.h> | |
e852340d | 24 | #include <linux/of.h> |
aa765647 PU |
25 | #include <linux/platform_device.h> |
26 | #include <linux/pwm.h> | |
27 | #include <linux/i2c/twl.h> | |
28 | #include <linux/slab.h> | |
29 | ||
30 | /* | |
31 | * This driver handles the PWM driven LED terminals of TWL4030 and TWL6030. | |
32 | * To generate the signal on TWL4030: | |
33 | * - LEDA uses PWMA | |
34 | * - LEDB uses PWMB | |
35 | * TWL6030 has one LED pin with dedicated LEDPWM | |
36 | */ | |
37 | ||
38 | #define TWL4030_LED_MAX 0x7f | |
39 | #define TWL6030_LED_MAX 0xff | |
40 | ||
41 | /* Registers, bits and macro for TWL4030 */ | |
42 | #define TWL4030_LEDEN_REG 0x00 | |
43 | #define TWL4030_PWMA_REG 0x01 | |
44 | ||
45 | #define TWL4030_LEDXON (1 << 0) | |
46 | #define TWL4030_LEDXPWM (1 << 4) | |
47 | #define TWL4030_LED_PINS (TWL4030_LEDXON | TWL4030_LEDXPWM) | |
48 | #define TWL4030_LED_TOGGLE(led, x) ((x) << (led)) | |
49 | ||
50 | /* Register, bits and macro for TWL6030 */ | |
51 | #define TWL6030_LED_PWM_CTRL1 0xf4 | |
52 | #define TWL6030_LED_PWM_CTRL2 0xf5 | |
53 | ||
54 | #define TWL6040_LED_MODE_HW 0x00 | |
55 | #define TWL6040_LED_MODE_ON 0x01 | |
56 | #define TWL6040_LED_MODE_OFF 0x02 | |
57 | #define TWL6040_LED_MODE_MASK 0x03 | |
58 | ||
59 | struct twl_pwmled_chip { | |
60 | struct pwm_chip chip; | |
61 | struct mutex mutex; | |
62 | }; | |
63 | ||
64 | static inline struct twl_pwmled_chip *to_twl(struct pwm_chip *chip) | |
65 | { | |
66 | return container_of(chip, struct twl_pwmled_chip, chip); | |
67 | } | |
68 | ||
69 | static int twl4030_pwmled_config(struct pwm_chip *chip, struct pwm_device *pwm, | |
70 | int duty_ns, int period_ns) | |
71 | { | |
72 | int duty_cycle = DIV_ROUND_UP(duty_ns * TWL4030_LED_MAX, period_ns) + 1; | |
73 | u8 pwm_config[2] = { 1, 0 }; | |
74 | int base, ret; | |
75 | ||
76 | /* | |
77 | * To configure the duty period: | |
78 | * On-cycle is set to 1 (the minimum allowed value) | |
79 | * The off time of 0 is not configurable, so the mapping is: | |
80 | * 0 -> off cycle = 2, | |
81 | * 1 -> off cycle = 2, | |
82 | * 2 -> off cycle = 3, | |
83 | * 126 - > off cycle 127, | |
84 | * 127 - > off cycle 1 | |
85 | * When on cycle == off cycle the PWM will be always on | |
86 | */ | |
87 | if (duty_cycle == 1) | |
88 | duty_cycle = 2; | |
89 | else if (duty_cycle > TWL4030_LED_MAX) | |
90 | duty_cycle = 1; | |
91 | ||
92 | base = pwm->hwpwm * 2 + TWL4030_PWMA_REG; | |
93 | ||
94 | pwm_config[1] = duty_cycle; | |
95 | ||
96 | ret = twl_i2c_write(TWL4030_MODULE_LED, pwm_config, base, 2); | |
97 | if (ret < 0) | |
98 | dev_err(chip->dev, "%s: Failed to configure PWM\n", pwm->label); | |
99 | ||
100 | return ret; | |
101 | } | |
102 | ||
103 | static int twl4030_pwmled_enable(struct pwm_chip *chip, struct pwm_device *pwm) | |
104 | { | |
105 | struct twl_pwmled_chip *twl = to_twl(chip); | |
106 | int ret; | |
107 | u8 val; | |
108 | ||
109 | mutex_lock(&twl->mutex); | |
110 | ret = twl_i2c_read_u8(TWL4030_MODULE_LED, &val, TWL4030_LEDEN_REG); | |
111 | if (ret < 0) { | |
112 | dev_err(chip->dev, "%s: Failed to read LEDEN\n", pwm->label); | |
113 | goto out; | |
114 | } | |
115 | ||
116 | val |= TWL4030_LED_TOGGLE(pwm->hwpwm, TWL4030_LED_PINS); | |
117 | ||
118 | ret = twl_i2c_write_u8(TWL4030_MODULE_LED, val, TWL4030_LEDEN_REG); | |
119 | if (ret < 0) | |
120 | dev_err(chip->dev, "%s: Failed to enable PWM\n", pwm->label); | |
121 | ||
122 | out: | |
123 | mutex_unlock(&twl->mutex); | |
124 | return ret; | |
125 | } | |
126 | ||
127 | static void twl4030_pwmled_disable(struct pwm_chip *chip, | |
128 | struct pwm_device *pwm) | |
129 | { | |
130 | struct twl_pwmled_chip *twl = to_twl(chip); | |
131 | int ret; | |
132 | u8 val; | |
133 | ||
134 | mutex_lock(&twl->mutex); | |
135 | ret = twl_i2c_read_u8(TWL4030_MODULE_LED, &val, TWL4030_LEDEN_REG); | |
136 | if (ret < 0) { | |
137 | dev_err(chip->dev, "%s: Failed to read LEDEN\n", pwm->label); | |
138 | goto out; | |
139 | } | |
140 | ||
141 | val &= ~TWL4030_LED_TOGGLE(pwm->hwpwm, TWL4030_LED_PINS); | |
142 | ||
143 | ret = twl_i2c_write_u8(TWL4030_MODULE_LED, val, TWL4030_LEDEN_REG); | |
144 | if (ret < 0) | |
145 | dev_err(chip->dev, "%s: Failed to disable PWM\n", pwm->label); | |
146 | ||
147 | out: | |
148 | mutex_unlock(&twl->mutex); | |
149 | } | |
150 | ||
151 | static int twl6030_pwmled_config(struct pwm_chip *chip, struct pwm_device *pwm, | |
152 | int duty_ns, int period_ns) | |
153 | { | |
154 | int duty_cycle = (duty_ns * TWL6030_LED_MAX) / period_ns; | |
155 | u8 on_time; | |
156 | int ret; | |
157 | ||
158 | on_time = duty_cycle & 0xff; | |
159 | ||
160 | ret = twl_i2c_write_u8(TWL6030_MODULE_ID1, on_time, | |
161 | TWL6030_LED_PWM_CTRL1); | |
162 | if (ret < 0) | |
163 | dev_err(chip->dev, "%s: Failed to configure PWM\n", pwm->label); | |
164 | ||
165 | return ret; | |
166 | } | |
167 | ||
168 | static int twl6030_pwmled_enable(struct pwm_chip *chip, struct pwm_device *pwm) | |
169 | { | |
170 | struct twl_pwmled_chip *twl = to_twl(chip); | |
171 | int ret; | |
172 | u8 val; | |
173 | ||
174 | mutex_lock(&twl->mutex); | |
175 | ret = twl_i2c_read_u8(TWL6030_MODULE_ID1, &val, TWL6030_LED_PWM_CTRL2); | |
176 | if (ret < 0) { | |
177 | dev_err(chip->dev, "%s: Failed to read PWM_CTRL2\n", | |
178 | pwm->label); | |
179 | goto out; | |
180 | } | |
181 | ||
182 | val &= ~TWL6040_LED_MODE_MASK; | |
183 | val |= TWL6040_LED_MODE_ON; | |
184 | ||
185 | ret = twl_i2c_write_u8(TWL6030_MODULE_ID1, val, TWL6030_LED_PWM_CTRL2); | |
186 | if (ret < 0) | |
187 | dev_err(chip->dev, "%s: Failed to enable PWM\n", pwm->label); | |
188 | ||
189 | out: | |
190 | mutex_unlock(&twl->mutex); | |
191 | return ret; | |
192 | } | |
193 | ||
194 | static void twl6030_pwmled_disable(struct pwm_chip *chip, | |
195 | struct pwm_device *pwm) | |
196 | { | |
197 | struct twl_pwmled_chip *twl = to_twl(chip); | |
198 | int ret; | |
199 | u8 val; | |
200 | ||
201 | mutex_lock(&twl->mutex); | |
202 | ret = twl_i2c_read_u8(TWL6030_MODULE_ID1, &val, TWL6030_LED_PWM_CTRL2); | |
203 | if (ret < 0) { | |
204 | dev_err(chip->dev, "%s: Failed to read PWM_CTRL2\n", | |
205 | pwm->label); | |
206 | goto out; | |
207 | } | |
208 | ||
209 | val &= ~TWL6040_LED_MODE_MASK; | |
210 | val |= TWL6040_LED_MODE_OFF; | |
211 | ||
212 | ret = twl_i2c_write_u8(TWL6030_MODULE_ID1, val, TWL6030_LED_PWM_CTRL2); | |
213 | if (ret < 0) | |
214 | dev_err(chip->dev, "%s: Failed to disable PWM\n", pwm->label); | |
215 | ||
216 | out: | |
217 | mutex_unlock(&twl->mutex); | |
218 | } | |
219 | ||
220 | static int twl6030_pwmled_request(struct pwm_chip *chip, struct pwm_device *pwm) | |
221 | { | |
222 | struct twl_pwmled_chip *twl = to_twl(chip); | |
223 | int ret; | |
224 | u8 val; | |
225 | ||
226 | mutex_lock(&twl->mutex); | |
227 | ret = twl_i2c_read_u8(TWL6030_MODULE_ID1, &val, TWL6030_LED_PWM_CTRL2); | |
228 | if (ret < 0) { | |
229 | dev_err(chip->dev, "%s: Failed to read PWM_CTRL2\n", | |
230 | pwm->label); | |
231 | goto out; | |
232 | } | |
233 | ||
234 | val &= ~TWL6040_LED_MODE_MASK; | |
235 | val |= TWL6040_LED_MODE_OFF; | |
236 | ||
237 | ret = twl_i2c_write_u8(TWL6030_MODULE_ID1, val, TWL6030_LED_PWM_CTRL2); | |
238 | if (ret < 0) | |
239 | dev_err(chip->dev, "%s: Failed to request PWM\n", pwm->label); | |
240 | ||
241 | out: | |
242 | mutex_unlock(&twl->mutex); | |
243 | return ret; | |
244 | } | |
245 | ||
246 | static void twl6030_pwmled_free(struct pwm_chip *chip, struct pwm_device *pwm) | |
247 | { | |
248 | struct twl_pwmled_chip *twl = to_twl(chip); | |
249 | int ret; | |
250 | u8 val; | |
251 | ||
252 | mutex_lock(&twl->mutex); | |
253 | ret = twl_i2c_read_u8(TWL6030_MODULE_ID1, &val, TWL6030_LED_PWM_CTRL2); | |
254 | if (ret < 0) { | |
255 | dev_err(chip->dev, "%s: Failed to read PWM_CTRL2\n", | |
256 | pwm->label); | |
257 | goto out; | |
258 | } | |
259 | ||
260 | val &= ~TWL6040_LED_MODE_MASK; | |
261 | val |= TWL6040_LED_MODE_HW; | |
262 | ||
263 | ret = twl_i2c_write_u8(TWL6030_MODULE_ID1, val, TWL6030_LED_PWM_CTRL2); | |
264 | if (ret < 0) | |
265 | dev_err(chip->dev, "%s: Failed to free PWM\n", pwm->label); | |
266 | ||
267 | out: | |
268 | mutex_unlock(&twl->mutex); | |
269 | } | |
270 | ||
271 | static const struct pwm_ops twl4030_pwmled_ops = { | |
272 | .enable = twl4030_pwmled_enable, | |
273 | .disable = twl4030_pwmled_disable, | |
274 | .config = twl4030_pwmled_config, | |
7fa25314 | 275 | .owner = THIS_MODULE, |
aa765647 PU |
276 | }; |
277 | ||
278 | static const struct pwm_ops twl6030_pwmled_ops = { | |
279 | .enable = twl6030_pwmled_enable, | |
280 | .disable = twl6030_pwmled_disable, | |
281 | .config = twl6030_pwmled_config, | |
282 | .request = twl6030_pwmled_request, | |
283 | .free = twl6030_pwmled_free, | |
7fa25314 | 284 | .owner = THIS_MODULE, |
aa765647 PU |
285 | }; |
286 | ||
287 | static int twl_pwmled_probe(struct platform_device *pdev) | |
288 | { | |
289 | struct twl_pwmled_chip *twl; | |
290 | int ret; | |
291 | ||
292 | twl = devm_kzalloc(&pdev->dev, sizeof(*twl), GFP_KERNEL); | |
293 | if (!twl) | |
294 | return -ENOMEM; | |
295 | ||
296 | if (twl_class_is_4030()) { | |
297 | twl->chip.ops = &twl4030_pwmled_ops; | |
298 | twl->chip.npwm = 2; | |
299 | } else { | |
300 | twl->chip.ops = &twl6030_pwmled_ops; | |
301 | twl->chip.npwm = 1; | |
302 | } | |
303 | ||
304 | twl->chip.dev = &pdev->dev; | |
305 | twl->chip.base = -1; | |
2e2a0f6e | 306 | twl->chip.can_sleep = true; |
aa765647 PU |
307 | |
308 | mutex_init(&twl->mutex); | |
309 | ||
310 | ret = pwmchip_add(&twl->chip); | |
311 | if (ret < 0) | |
312 | return ret; | |
313 | ||
314 | platform_set_drvdata(pdev, twl); | |
315 | ||
316 | return 0; | |
317 | } | |
318 | ||
319 | static int twl_pwmled_remove(struct platform_device *pdev) | |
320 | { | |
321 | struct twl_pwmled_chip *twl = platform_get_drvdata(pdev); | |
322 | ||
323 | return pwmchip_remove(&twl->chip); | |
324 | } | |
325 | ||
326 | #ifdef CONFIG_OF | |
f1a8870a | 327 | static const struct of_device_id twl_pwmled_of_match[] = { |
aa765647 PU |
328 | { .compatible = "ti,twl4030-pwmled" }, |
329 | { .compatible = "ti,twl6030-pwmled" }, | |
330 | { }, | |
331 | }; | |
332 | MODULE_DEVICE_TABLE(of, twl_pwmled_of_match); | |
333 | #endif | |
334 | ||
335 | static struct platform_driver twl_pwmled_driver = { | |
336 | .driver = { | |
337 | .name = "twl-pwmled", | |
338 | .of_match_table = of_match_ptr(twl_pwmled_of_match), | |
339 | }, | |
340 | .probe = twl_pwmled_probe, | |
341 | .remove = twl_pwmled_remove, | |
342 | }; | |
343 | module_platform_driver(twl_pwmled_driver); | |
344 | ||
345 | MODULE_AUTHOR("Peter Ujfalusi <peter.ujfalusi@ti.com>"); | |
346 | MODULE_DESCRIPTION("PWM driver for TWL4030 and TWL6030 LED outputs"); | |
347 | MODULE_ALIAS("platform:twl-pwmled"); | |
348 | MODULE_LICENSE("GPL"); |