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1/*
2 * Driver for TWL4030/6030 Generic Pulse Width Modulator
3 *
4 * Copyright (C) 2012 Texas Instruments
5 * Author: Peter Ujfalusi <peter.ujfalusi@ti.com>
6 *
7 * This program is free software; you can redistribute it and/or modify it
8 * under the terms of the GNU General Public License version 2 as published by
9 * the Free Software Foundation.
10 *
11 * This program is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
14 * more details.
15 *
16 * You should have received a copy of the GNU General Public License along with
17 * this program. If not, see <http://www.gnu.org/licenses/>.
18 */
19
20#include <linux/module.h>
21#include <linux/of.h>
22#include <linux/platform_device.h>
23#include <linux/pwm.h>
24#include <linux/mfd/twl.h>
25#include <linux/slab.h>
26
27/*
28 * This driver handles the PWMs of TWL4030 and TWL6030.
29 * The TRM names for the PWMs on TWL4030 are: PWM0, PWM1
30 * TWL6030 also have two PWMs named in the TRM as PWM1, PWM2
31 */
32
33#define TWL_PWM_MAX 0x7f
34
35/* Registers, bits and macro for TWL4030 */
36#define TWL4030_GPBR1_REG 0x0c
37#define TWL4030_PMBR1_REG 0x0d
38
39/* GPBR1 register bits */
40#define TWL4030_PWMXCLK_ENABLE (1 << 0)
41#define TWL4030_PWMX_ENABLE (1 << 2)
42#define TWL4030_PWMX_BITS (TWL4030_PWMX_ENABLE | TWL4030_PWMXCLK_ENABLE)
43#define TWL4030_PWM_TOGGLE(pwm, x) ((x) << (pwm))
44
45/* PMBR1 register bits */
46#define TWL4030_GPIO6_PWM0_MUTE_MASK (0x03 << 2)
47#define TWL4030_GPIO6_PWM0_MUTE_PWM0 (0x01 << 2)
48#define TWL4030_GPIO7_VIBRASYNC_PWM1_MASK (0x03 << 4)
49#define TWL4030_GPIO7_VIBRASYNC_PWM1_PWM1 (0x03 << 4)
50
51/* Register, bits and macro for TWL6030 */
52#define TWL6030_TOGGLE3_REG 0x92
53
54#define TWL6030_PWMXR (1 << 0)
55#define TWL6030_PWMXS (1 << 1)
56#define TWL6030_PWMXEN (1 << 2)
57#define TWL6030_PWM_TOGGLE(pwm, x) ((x) << (pwm * 3))
58
59struct twl_pwm_chip {
60 struct pwm_chip chip;
61 struct mutex mutex;
62 u8 twl6030_toggle3;
63 u8 twl4030_pwm_mux;
64};
65
66static inline struct twl_pwm_chip *to_twl(struct pwm_chip *chip)
67{
68 return container_of(chip, struct twl_pwm_chip, chip);
69}
70
71static int twl_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
72 int duty_ns, int period_ns)
73{
74 int duty_cycle = DIV_ROUND_UP(duty_ns * TWL_PWM_MAX, period_ns) + 1;
75 u8 pwm_config[2] = { 1, 0 };
76 int base, ret;
77
78 /*
79 * To configure the duty period:
80 * On-cycle is set to 1 (the minimum allowed value)
81 * The off time of 0 is not configurable, so the mapping is:
82 * 0 -> off cycle = 2,
83 * 1 -> off cycle = 2,
84 * 2 -> off cycle = 3,
85 * 126 - > off cycle 127,
86 * 127 - > off cycle 1
87 * When on cycle == off cycle the PWM will be always on
88 */
89 if (duty_cycle == 1)
90 duty_cycle = 2;
91 else if (duty_cycle > TWL_PWM_MAX)
92 duty_cycle = 1;
93
94 base = pwm->hwpwm * 3;
95
96 pwm_config[1] = duty_cycle;
97
98 ret = twl_i2c_write(TWL_MODULE_PWM, pwm_config, base, 2);
99 if (ret < 0)
100 dev_err(chip->dev, "%s: Failed to configure PWM\n", pwm->label);
101
102 return ret;
103}
104
105static int twl4030_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm)
106{
107 struct twl_pwm_chip *twl = to_twl(chip);
108 int ret;
109 u8 val;
110
111 mutex_lock(&twl->mutex);
112 ret = twl_i2c_read_u8(TWL4030_MODULE_INTBR, &val, TWL4030_GPBR1_REG);
113 if (ret < 0) {
114 dev_err(chip->dev, "%s: Failed to read GPBR1\n", pwm->label);
115 goto out;
116 }
117
118 val |= TWL4030_PWM_TOGGLE(pwm->hwpwm, TWL4030_PWMXCLK_ENABLE);
119
120 ret = twl_i2c_write_u8(TWL4030_MODULE_INTBR, val, TWL4030_GPBR1_REG);
121 if (ret < 0)
122 dev_err(chip->dev, "%s: Failed to enable PWM\n", pwm->label);
123
124 val |= TWL4030_PWM_TOGGLE(pwm->hwpwm, TWL4030_PWMX_ENABLE);
125
126 ret = twl_i2c_write_u8(TWL4030_MODULE_INTBR, val, TWL4030_GPBR1_REG);
127 if (ret < 0)
128 dev_err(chip->dev, "%s: Failed to enable PWM\n", pwm->label);
129
130out:
131 mutex_unlock(&twl->mutex);
132 return ret;
133}
134
135static void twl4030_pwm_disable(struct pwm_chip *chip, struct pwm_device *pwm)
136{
137 struct twl_pwm_chip *twl = to_twl(chip);
138 int ret;
139 u8 val;
140
141 mutex_lock(&twl->mutex);
142 ret = twl_i2c_read_u8(TWL4030_MODULE_INTBR, &val, TWL4030_GPBR1_REG);
143 if (ret < 0) {
144 dev_err(chip->dev, "%s: Failed to read GPBR1\n", pwm->label);
145 goto out;
146 }
147
148 val &= ~TWL4030_PWM_TOGGLE(pwm->hwpwm, TWL4030_PWMX_ENABLE);
149
150 ret = twl_i2c_write_u8(TWL4030_MODULE_INTBR, val, TWL4030_GPBR1_REG);
151 if (ret < 0)
152 dev_err(chip->dev, "%s: Failed to disable PWM\n", pwm->label);
153
154 val &= ~TWL4030_PWM_TOGGLE(pwm->hwpwm, TWL4030_PWMXCLK_ENABLE);
155
156 ret = twl_i2c_write_u8(TWL4030_MODULE_INTBR, val, TWL4030_GPBR1_REG);
157 if (ret < 0)
158 dev_err(chip->dev, "%s: Failed to disable PWM\n", pwm->label);
159
160out:
161 mutex_unlock(&twl->mutex);
162}
163
164static int twl4030_pwm_request(struct pwm_chip *chip, struct pwm_device *pwm)
165{
166 struct twl_pwm_chip *twl = to_twl(chip);
167 int ret;
168 u8 val, mask, bits;
169
170 if (pwm->hwpwm == 1) {
171 mask = TWL4030_GPIO7_VIBRASYNC_PWM1_MASK;
172 bits = TWL4030_GPIO7_VIBRASYNC_PWM1_PWM1;
173 } else {
174 mask = TWL4030_GPIO6_PWM0_MUTE_MASK;
175 bits = TWL4030_GPIO6_PWM0_MUTE_PWM0;
176 }
177
178 mutex_lock(&twl->mutex);
179 ret = twl_i2c_read_u8(TWL4030_MODULE_INTBR, &val, TWL4030_PMBR1_REG);
180 if (ret < 0) {
181 dev_err(chip->dev, "%s: Failed to read PMBR1\n", pwm->label);
182 goto out;
183 }
184
185 /* Save the current MUX configuration for the PWM */
186 twl->twl4030_pwm_mux &= ~mask;
187 twl->twl4030_pwm_mux |= (val & mask);
188
189 /* Select PWM functionality */
190 val &= ~mask;
191 val |= bits;
192
193 ret = twl_i2c_write_u8(TWL4030_MODULE_INTBR, val, TWL4030_PMBR1_REG);
194 if (ret < 0)
195 dev_err(chip->dev, "%s: Failed to request PWM\n", pwm->label);
196
197out:
198 mutex_unlock(&twl->mutex);
199 return ret;
200}
201
202static void twl4030_pwm_free(struct pwm_chip *chip, struct pwm_device *pwm)
203{
204 struct twl_pwm_chip *twl = to_twl(chip);
205 int ret;
206 u8 val, mask;
207
208 if (pwm->hwpwm == 1)
209 mask = TWL4030_GPIO7_VIBRASYNC_PWM1_MASK;
210 else
211 mask = TWL4030_GPIO6_PWM0_MUTE_MASK;
212
213 mutex_lock(&twl->mutex);
214 ret = twl_i2c_read_u8(TWL4030_MODULE_INTBR, &val, TWL4030_PMBR1_REG);
215 if (ret < 0) {
216 dev_err(chip->dev, "%s: Failed to read PMBR1\n", pwm->label);
217 goto out;
218 }
219
220 /* Restore the MUX configuration for the PWM */
221 val &= ~mask;
222 val |= (twl->twl4030_pwm_mux & mask);
223
224 ret = twl_i2c_write_u8(TWL4030_MODULE_INTBR, val, TWL4030_PMBR1_REG);
225 if (ret < 0)
226 dev_err(chip->dev, "%s: Failed to free PWM\n", pwm->label);
227
228out:
229 mutex_unlock(&twl->mutex);
230}
231
232static int twl6030_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm)
233{
234 struct twl_pwm_chip *twl = to_twl(chip);
235 int ret;
236 u8 val;
237
238 mutex_lock(&twl->mutex);
239 val = twl->twl6030_toggle3;
240 val |= TWL6030_PWM_TOGGLE(pwm->hwpwm, TWL6030_PWMXS | TWL6030_PWMXEN);
241 val &= ~TWL6030_PWM_TOGGLE(pwm->hwpwm, TWL6030_PWMXR);
242
243 ret = twl_i2c_write_u8(TWL6030_MODULE_ID1, val, TWL6030_TOGGLE3_REG);
244 if (ret < 0) {
245 dev_err(chip->dev, "%s: Failed to enable PWM\n", pwm->label);
246 goto out;
247 }
248
249 twl->twl6030_toggle3 = val;
250out:
251 mutex_unlock(&twl->mutex);
252 return ret;
253}
254
255static void twl6030_pwm_disable(struct pwm_chip *chip, struct pwm_device *pwm)
256{
257 struct twl_pwm_chip *twl = to_twl(chip);
258 int ret;
259 u8 val;
260
261 mutex_lock(&twl->mutex);
262 val = twl->twl6030_toggle3;
263 val |= TWL6030_PWM_TOGGLE(pwm->hwpwm, TWL6030_PWMXR);
264 val &= ~TWL6030_PWM_TOGGLE(pwm->hwpwm, TWL6030_PWMXS | TWL6030_PWMXEN);
265
266 ret = twl_i2c_write_u8(TWL6030_MODULE_ID1, val, TWL6030_TOGGLE3_REG);
267 if (ret < 0) {
268 dev_err(chip->dev, "%s: Failed to disable PWM\n", pwm->label);
269 goto out;
270 }
271
272 val |= TWL6030_PWM_TOGGLE(pwm->hwpwm, TWL6030_PWMXEN);
273
274 ret = twl_i2c_write_u8(TWL6030_MODULE_ID1, val, TWL6030_TOGGLE3_REG);
275 if (ret < 0) {
276 dev_err(chip->dev, "%s: Failed to disable PWM\n", pwm->label);
277 goto out;
278 }
279
280 val &= ~TWL6030_PWM_TOGGLE(pwm->hwpwm, TWL6030_PWMXEN);
281
282 ret = twl_i2c_write_u8(TWL6030_MODULE_ID1, val, TWL6030_TOGGLE3_REG);
283 if (ret < 0) {
284 dev_err(chip->dev, "%s: Failed to disable PWM\n", pwm->label);
285 goto out;
286 }
287
288 twl->twl6030_toggle3 = val;
289out:
290 mutex_unlock(&twl->mutex);
291}
292
293static const struct pwm_ops twl4030_pwm_ops = {
294 .config = twl_pwm_config,
295 .enable = twl4030_pwm_enable,
296 .disable = twl4030_pwm_disable,
297 .request = twl4030_pwm_request,
298 .free = twl4030_pwm_free,
299 .owner = THIS_MODULE,
300};
301
302static const struct pwm_ops twl6030_pwm_ops = {
303 .config = twl_pwm_config,
304 .enable = twl6030_pwm_enable,
305 .disable = twl6030_pwm_disable,
306 .owner = THIS_MODULE,
307};
308
309static int twl_pwm_probe(struct platform_device *pdev)
310{
311 struct twl_pwm_chip *twl;
312 int ret;
313
314 twl = devm_kzalloc(&pdev->dev, sizeof(*twl), GFP_KERNEL);
315 if (!twl)
316 return -ENOMEM;
317
318 if (twl_class_is_4030())
319 twl->chip.ops = &twl4030_pwm_ops;
320 else
321 twl->chip.ops = &twl6030_pwm_ops;
322
323 twl->chip.dev = &pdev->dev;
324 twl->chip.base = -1;
325 twl->chip.npwm = 2;
326
327 mutex_init(&twl->mutex);
328
329 ret = pwmchip_add(&twl->chip);
330 if (ret < 0)
331 return ret;
332
333 platform_set_drvdata(pdev, twl);
334
335 return 0;
336}
337
338static int twl_pwm_remove(struct platform_device *pdev)
339{
340 struct twl_pwm_chip *twl = platform_get_drvdata(pdev);
341
342 return pwmchip_remove(&twl->chip);
343}
344
345#ifdef CONFIG_OF
346static const struct of_device_id twl_pwm_of_match[] = {
347 { .compatible = "ti,twl4030-pwm" },
348 { .compatible = "ti,twl6030-pwm" },
349 { },
350};
351MODULE_DEVICE_TABLE(of, twl_pwm_of_match);
352#endif
353
354static struct platform_driver twl_pwm_driver = {
355 .driver = {
356 .name = "twl-pwm",
357 .of_match_table = of_match_ptr(twl_pwm_of_match),
358 },
359 .probe = twl_pwm_probe,
360 .remove = twl_pwm_remove,
361};
362module_platform_driver(twl_pwm_driver);
363
364MODULE_AUTHOR("Peter Ujfalusi <peter.ujfalusi@ti.com>");
365MODULE_DESCRIPTION("PWM driver for TWL4030 and TWL6030");
366MODULE_ALIAS("platform:twl-pwm");
367MODULE_LICENSE("GPL");
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Driver for TWL4030/6030 Generic Pulse Width Modulator
4 *
5 * Copyright (C) 2012 Texas Instruments
6 * Author: Peter Ujfalusi <peter.ujfalusi@ti.com>
7 */
8
9#include <linux/module.h>
10#include <linux/of.h>
11#include <linux/platform_device.h>
12#include <linux/pwm.h>
13#include <linux/mfd/twl.h>
14#include <linux/slab.h>
15
16/*
17 * This driver handles the PWMs of TWL4030 and TWL6030.
18 * The TRM names for the PWMs on TWL4030 are: PWM0, PWM1
19 * TWL6030 also have two PWMs named in the TRM as PWM1, PWM2
20 */
21
22#define TWL_PWM_MAX 0x7f
23
24/* Registers, bits and macro for TWL4030 */
25#define TWL4030_GPBR1_REG 0x0c
26#define TWL4030_PMBR1_REG 0x0d
27
28/* GPBR1 register bits */
29#define TWL4030_PWMXCLK_ENABLE (1 << 0)
30#define TWL4030_PWMX_ENABLE (1 << 2)
31#define TWL4030_PWMX_BITS (TWL4030_PWMX_ENABLE | TWL4030_PWMXCLK_ENABLE)
32#define TWL4030_PWM_TOGGLE(pwm, x) ((x) << (pwm))
33
34/* PMBR1 register bits */
35#define TWL4030_GPIO6_PWM0_MUTE_MASK (0x03 << 2)
36#define TWL4030_GPIO6_PWM0_MUTE_PWM0 (0x01 << 2)
37#define TWL4030_GPIO7_VIBRASYNC_PWM1_MASK (0x03 << 4)
38#define TWL4030_GPIO7_VIBRASYNC_PWM1_PWM1 (0x03 << 4)
39
40/* Register, bits and macro for TWL6030 */
41#define TWL6030_TOGGLE3_REG 0x92
42
43#define TWL6030_PWMXR (1 << 0)
44#define TWL6030_PWMXS (1 << 1)
45#define TWL6030_PWMXEN (1 << 2)
46#define TWL6030_PWM_TOGGLE(pwm, x) ((x) << (pwm * 3))
47
48struct twl_pwm_chip {
49 struct pwm_chip chip;
50 struct mutex mutex;
51 u8 twl6030_toggle3;
52 u8 twl4030_pwm_mux;
53};
54
55static inline struct twl_pwm_chip *to_twl(struct pwm_chip *chip)
56{
57 return container_of(chip, struct twl_pwm_chip, chip);
58}
59
60static int twl_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
61 u64 duty_ns, u64 period_ns)
62{
63 int duty_cycle = DIV64_U64_ROUND_UP(duty_ns * TWL_PWM_MAX, period_ns) + 1;
64 u8 pwm_config[2] = { 1, 0 };
65 int base, ret;
66
67 /*
68 * To configure the duty period:
69 * On-cycle is set to 1 (the minimum allowed value)
70 * The off time of 0 is not configurable, so the mapping is:
71 * 0 -> off cycle = 2,
72 * 1 -> off cycle = 2,
73 * 2 -> off cycle = 3,
74 * 126 - > off cycle 127,
75 * 127 - > off cycle 1
76 * When on cycle == off cycle the PWM will be always on
77 */
78 if (duty_cycle == 1)
79 duty_cycle = 2;
80 else if (duty_cycle > TWL_PWM_MAX)
81 duty_cycle = 1;
82
83 base = pwm->hwpwm * 3;
84
85 pwm_config[1] = duty_cycle;
86
87 ret = twl_i2c_write(TWL_MODULE_PWM, pwm_config, base, 2);
88 if (ret < 0)
89 dev_err(chip->dev, "%s: Failed to configure PWM\n", pwm->label);
90
91 return ret;
92}
93
94static int twl4030_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm)
95{
96 struct twl_pwm_chip *twl = to_twl(chip);
97 int ret;
98 u8 val;
99
100 mutex_lock(&twl->mutex);
101 ret = twl_i2c_read_u8(TWL4030_MODULE_INTBR, &val, TWL4030_GPBR1_REG);
102 if (ret < 0) {
103 dev_err(chip->dev, "%s: Failed to read GPBR1\n", pwm->label);
104 goto out;
105 }
106
107 val |= TWL4030_PWM_TOGGLE(pwm->hwpwm, TWL4030_PWMXCLK_ENABLE);
108
109 ret = twl_i2c_write_u8(TWL4030_MODULE_INTBR, val, TWL4030_GPBR1_REG);
110 if (ret < 0)
111 dev_err(chip->dev, "%s: Failed to enable PWM\n", pwm->label);
112
113 val |= TWL4030_PWM_TOGGLE(pwm->hwpwm, TWL4030_PWMX_ENABLE);
114
115 ret = twl_i2c_write_u8(TWL4030_MODULE_INTBR, val, TWL4030_GPBR1_REG);
116 if (ret < 0)
117 dev_err(chip->dev, "%s: Failed to enable PWM\n", pwm->label);
118
119out:
120 mutex_unlock(&twl->mutex);
121 return ret;
122}
123
124static void twl4030_pwm_disable(struct pwm_chip *chip, struct pwm_device *pwm)
125{
126 struct twl_pwm_chip *twl = to_twl(chip);
127 int ret;
128 u8 val;
129
130 mutex_lock(&twl->mutex);
131 ret = twl_i2c_read_u8(TWL4030_MODULE_INTBR, &val, TWL4030_GPBR1_REG);
132 if (ret < 0) {
133 dev_err(chip->dev, "%s: Failed to read GPBR1\n", pwm->label);
134 goto out;
135 }
136
137 val &= ~TWL4030_PWM_TOGGLE(pwm->hwpwm, TWL4030_PWMX_ENABLE);
138
139 ret = twl_i2c_write_u8(TWL4030_MODULE_INTBR, val, TWL4030_GPBR1_REG);
140 if (ret < 0)
141 dev_err(chip->dev, "%s: Failed to disable PWM\n", pwm->label);
142
143 val &= ~TWL4030_PWM_TOGGLE(pwm->hwpwm, TWL4030_PWMXCLK_ENABLE);
144
145 ret = twl_i2c_write_u8(TWL4030_MODULE_INTBR, val, TWL4030_GPBR1_REG);
146 if (ret < 0)
147 dev_err(chip->dev, "%s: Failed to disable PWM\n", pwm->label);
148
149out:
150 mutex_unlock(&twl->mutex);
151}
152
153static int twl4030_pwm_request(struct pwm_chip *chip, struct pwm_device *pwm)
154{
155 struct twl_pwm_chip *twl = to_twl(chip);
156 int ret;
157 u8 val, mask, bits;
158
159 if (pwm->hwpwm == 1) {
160 mask = TWL4030_GPIO7_VIBRASYNC_PWM1_MASK;
161 bits = TWL4030_GPIO7_VIBRASYNC_PWM1_PWM1;
162 } else {
163 mask = TWL4030_GPIO6_PWM0_MUTE_MASK;
164 bits = TWL4030_GPIO6_PWM0_MUTE_PWM0;
165 }
166
167 mutex_lock(&twl->mutex);
168 ret = twl_i2c_read_u8(TWL4030_MODULE_INTBR, &val, TWL4030_PMBR1_REG);
169 if (ret < 0) {
170 dev_err(chip->dev, "%s: Failed to read PMBR1\n", pwm->label);
171 goto out;
172 }
173
174 /* Save the current MUX configuration for the PWM */
175 twl->twl4030_pwm_mux &= ~mask;
176 twl->twl4030_pwm_mux |= (val & mask);
177
178 /* Select PWM functionality */
179 val &= ~mask;
180 val |= bits;
181
182 ret = twl_i2c_write_u8(TWL4030_MODULE_INTBR, val, TWL4030_PMBR1_REG);
183 if (ret < 0)
184 dev_err(chip->dev, "%s: Failed to request PWM\n", pwm->label);
185
186out:
187 mutex_unlock(&twl->mutex);
188 return ret;
189}
190
191static void twl4030_pwm_free(struct pwm_chip *chip, struct pwm_device *pwm)
192{
193 struct twl_pwm_chip *twl = to_twl(chip);
194 int ret;
195 u8 val, mask;
196
197 if (pwm->hwpwm == 1)
198 mask = TWL4030_GPIO7_VIBRASYNC_PWM1_MASK;
199 else
200 mask = TWL4030_GPIO6_PWM0_MUTE_MASK;
201
202 mutex_lock(&twl->mutex);
203 ret = twl_i2c_read_u8(TWL4030_MODULE_INTBR, &val, TWL4030_PMBR1_REG);
204 if (ret < 0) {
205 dev_err(chip->dev, "%s: Failed to read PMBR1\n", pwm->label);
206 goto out;
207 }
208
209 /* Restore the MUX configuration for the PWM */
210 val &= ~mask;
211 val |= (twl->twl4030_pwm_mux & mask);
212
213 ret = twl_i2c_write_u8(TWL4030_MODULE_INTBR, val, TWL4030_PMBR1_REG);
214 if (ret < 0)
215 dev_err(chip->dev, "%s: Failed to free PWM\n", pwm->label);
216
217out:
218 mutex_unlock(&twl->mutex);
219}
220
221static int twl6030_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm)
222{
223 struct twl_pwm_chip *twl = to_twl(chip);
224 int ret;
225 u8 val;
226
227 mutex_lock(&twl->mutex);
228 val = twl->twl6030_toggle3;
229 val |= TWL6030_PWM_TOGGLE(pwm->hwpwm, TWL6030_PWMXS | TWL6030_PWMXEN);
230 val &= ~TWL6030_PWM_TOGGLE(pwm->hwpwm, TWL6030_PWMXR);
231
232 ret = twl_i2c_write_u8(TWL6030_MODULE_ID1, val, TWL6030_TOGGLE3_REG);
233 if (ret < 0) {
234 dev_err(chip->dev, "%s: Failed to enable PWM\n", pwm->label);
235 goto out;
236 }
237
238 twl->twl6030_toggle3 = val;
239out:
240 mutex_unlock(&twl->mutex);
241 return ret;
242}
243
244static void twl6030_pwm_disable(struct pwm_chip *chip, struct pwm_device *pwm)
245{
246 struct twl_pwm_chip *twl = to_twl(chip);
247 int ret;
248 u8 val;
249
250 mutex_lock(&twl->mutex);
251 val = twl->twl6030_toggle3;
252 val |= TWL6030_PWM_TOGGLE(pwm->hwpwm, TWL6030_PWMXR);
253 val &= ~TWL6030_PWM_TOGGLE(pwm->hwpwm, TWL6030_PWMXS | TWL6030_PWMXEN);
254
255 ret = twl_i2c_write_u8(TWL6030_MODULE_ID1, val, TWL6030_TOGGLE3_REG);
256 if (ret < 0) {
257 dev_err(chip->dev, "%s: Failed to disable PWM\n", pwm->label);
258 goto out;
259 }
260
261 val |= TWL6030_PWM_TOGGLE(pwm->hwpwm, TWL6030_PWMXEN);
262
263 ret = twl_i2c_write_u8(TWL6030_MODULE_ID1, val, TWL6030_TOGGLE3_REG);
264 if (ret < 0) {
265 dev_err(chip->dev, "%s: Failed to disable PWM\n", pwm->label);
266 goto out;
267 }
268
269 val &= ~TWL6030_PWM_TOGGLE(pwm->hwpwm, TWL6030_PWMXEN);
270
271 ret = twl_i2c_write_u8(TWL6030_MODULE_ID1, val, TWL6030_TOGGLE3_REG);
272 if (ret < 0) {
273 dev_err(chip->dev, "%s: Failed to disable PWM\n", pwm->label);
274 goto out;
275 }
276
277 twl->twl6030_toggle3 = val;
278out:
279 mutex_unlock(&twl->mutex);
280}
281
282static int twl4030_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm,
283 const struct pwm_state *state)
284{
285 int err;
286
287 if (state->polarity != PWM_POLARITY_NORMAL)
288 return -EINVAL;
289
290 if (!state->enabled) {
291 if (pwm->state.enabled)
292 twl4030_pwm_disable(chip, pwm);
293
294 return 0;
295 }
296
297 err = twl_pwm_config(chip, pwm, state->duty_cycle, state->period);
298 if (err)
299 return err;
300
301 if (!pwm->state.enabled)
302 err = twl4030_pwm_enable(chip, pwm);
303
304 return err;
305}
306
307static int twl6030_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm,
308 const struct pwm_state *state)
309{
310 int err;
311
312 if (state->polarity != PWM_POLARITY_NORMAL)
313 return -EINVAL;
314
315 if (!state->enabled) {
316 if (pwm->state.enabled)
317 twl6030_pwm_disable(chip, pwm);
318
319 return 0;
320 }
321
322 err = twl_pwm_config(chip, pwm, state->duty_cycle, state->period);
323 if (err)
324 return err;
325
326 if (!pwm->state.enabled)
327 err = twl6030_pwm_enable(chip, pwm);
328
329 return err;
330}
331
332static const struct pwm_ops twl4030_pwm_ops = {
333 .apply = twl4030_pwm_apply,
334 .request = twl4030_pwm_request,
335 .free = twl4030_pwm_free,
336};
337
338static const struct pwm_ops twl6030_pwm_ops = {
339 .apply = twl6030_pwm_apply,
340};
341
342static int twl_pwm_probe(struct platform_device *pdev)
343{
344 struct twl_pwm_chip *twl;
345
346 twl = devm_kzalloc(&pdev->dev, sizeof(*twl), GFP_KERNEL);
347 if (!twl)
348 return -ENOMEM;
349
350 if (twl_class_is_4030())
351 twl->chip.ops = &twl4030_pwm_ops;
352 else
353 twl->chip.ops = &twl6030_pwm_ops;
354
355 twl->chip.dev = &pdev->dev;
356 twl->chip.npwm = 2;
357
358 mutex_init(&twl->mutex);
359
360 return devm_pwmchip_add(&pdev->dev, &twl->chip);
361}
362
363#ifdef CONFIG_OF
364static const struct of_device_id twl_pwm_of_match[] = {
365 { .compatible = "ti,twl4030-pwm" },
366 { .compatible = "ti,twl6030-pwm" },
367 { },
368};
369MODULE_DEVICE_TABLE(of, twl_pwm_of_match);
370#endif
371
372static struct platform_driver twl_pwm_driver = {
373 .driver = {
374 .name = "twl-pwm",
375 .of_match_table = of_match_ptr(twl_pwm_of_match),
376 },
377 .probe = twl_pwm_probe,
378};
379module_platform_driver(twl_pwm_driver);
380
381MODULE_AUTHOR("Peter Ujfalusi <peter.ujfalusi@ti.com>");
382MODULE_DESCRIPTION("PWM driver for TWL4030 and TWL6030");
383MODULE_ALIAS("platform:twl-pwm");
384MODULE_LICENSE("GPL");