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